JP3415804B2 - Flywheel assembly - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel assembly, and more particularly to a flywheel assembly having a flexible plate for elastically connecting an engine crankshaft and a flywheel.

[0002]

2. Description of the Related Art In an engine, a combustion force is converted into a rotational force by a crankshaft, and a bending force acts on the crankshaft by the combustion force. Due to the bending of the crankshaft, the flywheel attached to the end of the crankshaft undergoes bending vibration. Then, the reaction force is transmitted to the engine block and further vibrates the vehicle body through the engine mount. This causes noise during acceleration.

In order to reduce such noise during acceleration, it is necessary to reduce the vibration of the flywheel. Therefore, it has been conventionally performed to support the flywheel with a flexible plate. This flexible plate has high rigidity in the rotation direction and low rigidity in the bending vibration direction.

[0004]

The lower the rigidity of the flexible plate is, the more effective it is in reducing bending vibration. In particular, by adopting a low-rigidity flexible plate, it is possible to shift the resonance point from the actual use area, and it is possible to reduce noise during engine acceleration. However, if the plate thickness is made too small in order to reduce the rigidity of the flexible plate in the bending vibration direction, the stress of the flexible plate becomes high and the service life becomes short. If the rigidity in the bending vibration direction is too low, the flywheel may move in the axial direction when the clutch is released, and the disengagement of the clutch may deteriorate.

An object of the present invention is to reduce noise during acceleration without impairing clutch disengagement.

[0006]

A flywheel assembly according to claim 1 is a clutch cover assembly and a clutch.
A clutch device having a disc assembly is mounted , and a flywheel, a flexible plate and an annular
And a plate. Flywheel friction on the outer peripheral portion
It has a rubbing surface. The flexible plate is Rutotomoni inner periphery outer periphery is fixed to the flywheel is securable to the crankshaft end, high rigidity and bending vibration in the rotational direction
The rigidity is low in the moving direction. The annular plate is a flywheel
Is placed between the flexible plate and the flexible plate
If the bull plate bends in the axial direction more than a specified amount,
Can be contacted with the side of the wheel, and clutch release operation
The rigidity is high in the direction and low in the bending direction.

In this flywheel assembly, when the bending vibration is transmitted from the crankshaft end of the engine, the flexible plate bends in the axial direction, thereby absorbing the bending vibration. At this time, the flexure of the flexible plate itself is restricted by using the annular plate . Ring pre
It can lower as compared with the conventional rigidity of the flexible plate by over preparative, it is possible to shift the resonance point from the actual used speed range. Therefore, noise during acceleration can be reduced. Moreover, the flexure of the flexible plate is restricted by the annular plate , and the stress generated in the flexible plate can be prevented from exceeding an allowable level, and the life of the flexible plate can be extended. Furthermore, the ring
Since the plate restricts the movement of the flywheel in the axial direction, it is possible to prevent deterioration of the clutch disengagement. Further, when the annular plate slides on the flywheel, a frictional force is generated between them, so that the frictional force can suppress the vibration.

A flywheel assembly according to claim 2.
The flywheel assembly of claim 1, wherein
The rate has a bent part on the outer circumference,
The axial rigidity is the axial rigidity of the flexible plate.
High compared to. The flywheel assembly according to claim 3 is the flywheel assembly according to claim 1 or 2.
The annular plate causes the flywheel to vibrate in the bending direction.
When doing so, the outer peripheral portion is in sliding contact with the side surface of the flywheel.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a flywheel assembly 1 and a clutch device 2 mounted on the flywheel assembly 1 according to an embodiment of the present invention. The flywheel assembly 1 is attached to the end of the crankshaft 3, and includes a flexible plate 4, a flywheel 5, and
It is composed of a washer plate 15 as a stopper mechanism.

The flexible plate 4 has a hole 4 at the center.
It has a and is formed in a disc shape. The inner peripheral portion 4b of the flexible plate 4 is fixed to the flange portion 3a of the crankshaft 3 with bolts 6. A flywheel 5 is fixed to the outer peripheral portion 4c of the flexible plate 4 with bolts 7. A plurality of through holes 8 are formed in the intermediate portion 4d between the inner peripheral portion 4b and the outer peripheral portion 4c of the flexible plate 4. The plurality of through holes 8 are arranged at equal intervals in the circumferential direction.

The flywheel 5 is a substantially disk-shaped member, the side surface of the inner peripheral portion of which faces the end surface of the crankshaft 3. A friction surface 5a is formed on the outer peripheral portion of the flywheel 5, and a plurality of holes 9 are formed on the inner peripheral side of the friction surface 5a. The holes 9 are formed at equal intervals in the circumferential direction.
A hole 10 is formed further inside the hole 9 in order to avoid interference with the head of the bolt 6.

The washer plate 15 is arranged between the inner peripheral portion of the flexible plate 4 and the flywheel 5. The washer plate 15 has a ring shape, and its outer diameter is set to be larger than that of the flange portion 3a of the crankshaft 3. Also, as shown enlarged in FIG. 3, the washer plate 1
The outer peripheral portion 15a of 5 is bent toward the flywheel 5 at a predetermined angle, and the outer peripheral portion of the outer peripheral portion 15a is bent to be a flat surface 15b parallel to the side surface of the flywheel 5. Further, on the outer peripheral portion of the washer plate 15,
As shown in FIG. 2, a plurality of radial slits 16 are formed at equal intervals in the circumferential direction. With such a configuration, the washer plate 15 has high rigidity in the clutch release operation direction (axial direction) and low rigidity in the bending direction. However, the rigidity of the outer peripheral bent portion 15a in the axial direction is higher than the rigidity of the flexible plate 4 in the axial direction.

Here, by making the outer diameter of the washer plate 15 larger than the outer diameter of the flange portion 3a, deformation of the flexible plate 4 is suppressed, and the flexible plate 4 is joined to the flange portion 3a having the highest stress. It is possible to diffuse the stress at (the contact portion with the outer peripheral end of the flange portion 3a). Further, since the outer peripheral end portion of the washer plate 15 is the flat surface 15b, the washer plate 15 always comes into stable contact with the side surface of the flywheel 5 when a large bending vibration occurs. Therefore, it is possible to suppress the change over time in the friction damping force caused by the contact.

The flexible plate 4 and the flywheel 5 are arranged so that a gap is formed between the inner peripheral portion 4b of the flexible plate 4 and the flywheel 5. And, in the assembled state, the washer plate 15
The outer peripheral flat portion 15b is not in contact with the side surface of the flywheel 5, and the gap d (see FIG. 3) is secured. The clutch device 2 includes a clutch cover assembly 20 and a clutch disc assembly 21 arranged inside the clutch cover assembly 20. Clutch cover assembly 2
Reference numeral 0 denotes a pressure plate 23 for sandwiching the clutch disc assembly 21 between the clutch cover 22 fixed to the outer peripheral portion of the flywheel 5 and the friction surface 5a of the flywheel 5, and for pressing the pressure plate 23. It has a diaphragm spring 24.

In such a structure, heat is generated when the clutch disc assembly 21 rubs against the friction surface 5a of the flywheel 5, but holes 8 and 9 are formed in the flywheel 5 and the flexible plate 4, respectively. Since the air flow path is formed by these, the heat of the flywheel 5 is cooled by the air flowing through this flow path.
Therefore, it is possible to suppress abnormal wear of friction facings and early deterioration of characteristics due to heat.

By adjusting the size and number of the holes 8 of the flexible plate 4, the rigidity of the flexible plate 4 in the bending direction can be adjusted. Next, the operation of the washer plate 15 of this embodiment will be described.
The bending moment input from the engine is transmitted to the flywheel 5 via the flexible plate 4.
At this time, in a state where the bending of the flexible plate 4 due to bending vibration is small and the outer peripheral end of the washer plate 15 is not in contact with the flywheel 5, the flexible characteristic according to the initial load of the flexible plate 4 and the washer plate 15 (see FIG. 5). Points O to A) are obtained. As a result, surface runout of the flywheel 5 is suppressed, and uneven wear of the friction facing of the clutch disc assembly 21 can be suppressed.

When the amplitude of bending vibration is increased and the deflection angle of the flexible plate 4 is increased, the flexible plate 4 is largely bent. When the amount of bending is d at the outer peripheral end portion of the washer plate 15, the outer peripheral portion of the washer plate 15 is fried. It is pressed against the side surface of the wheel 5. In this case, in addition to the spring characteristics of the flexible plate 4, the washer plate 1
The rigidity is suppressed by the rigidity of 5 (flexible characteristic after point A in FIG. 5). At the same time, the friction damping force generated by the contact between the outer peripheral end flat surface 15b of the washer plate 15 and the flywheel 5 causes a hysteresis torque 17 shown in FIG. 5 to absorb the bending vibration.

As described above, the washer plate 15 and the flexible plate 4 have two-step characteristics, and the washer plate 15 functions as a stopper mechanism for suppressing the deformation of the flexible plate 4, thereby deteriorating the disengagement of the clutch. Flexible plate 4 without
The rigidity of can be made lower than the conventional one, and the bending vibration transmitted to the flywheel can be efficiently absorbed.

Further, since the flexible plate 4 is prevented from being excessively bent, the durability of the flexible plate 4 can be improved. Here, the vibration characteristics on the crankshaft side are shown in FIG. In the figure, the broken line is the vibration characteristic of the conventional flywheel, the dashed-dotted line is the vibration characteristic when the conventional flexible plate is used, and the solid line is the vibration characteristic when the flywheel assembly of the present embodiment is used. As is clear from FIG. 6, when the flywheel assembly according to the present embodiment is used, the rigidity of the flexible plate 4 can be further lowered, so that the resonance point can be deviated from the actual use region and the noise during engine acceleration can be increased. Can be realized.

The vibration characteristics on the flywheel side are shown in FIG.
Shown in. In the figure, the broken line is the vibration characteristic of the conventional flywheel, the dashed-dotted line is the vibration characteristic when the conventional flexible plate is used, and the solid line is the vibration characteristic when the flywheel assembly of the present embodiment is used. As is clear from FIG. 7, the flywheel bending angle at the time of resonance in the low frequency region is small, which can reduce the vibration of the clutch pedal. Further, in the actual use area, the flywheel assembly of this embodiment can suppress the flywheel bending angle as compared with the conventional one. This can improve the disengagement of the clutch.

[Other Embodiments] As shown in FIG. 4, in a state before the washer plate 15 is fixed to the flexible plate 4, even if the outer peripheral side is warped to the flexible plate 4 side so as to have a bending allowance. Good. In this case, attach the washer plate 15 to the bolt 6
The initial load acts on the inner peripheral portion of the flexible plate 4 in the assembled state. Therefore, the effect of suppressing the deformation of the flexible plate 4 becomes greater, and the stress of the flexible plate 4 can be further reduced.

[0022]

As described above, in the present invention, in the flywheel assembly in which the crankshaft and the flywheel are connected by the flexible plate, the annular plate for restricting the flexure of the flexible plate is provided, so that the rigidity of the flexible plate is improved. It can be made lower, and the disengagement of the clutch can be favorably maintained while efficiently absorbing the bending vibration.
Further, it is possible to prevent the durability of the flexible plate from lowering.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a clutch device that employs a flywheel assembly according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the flywheel assembly.

FIG. 3 is an enlarged partial view of the flywheel assembly.

FIG. 4 is an exploded partial view of a flywheel assembly according to another embodiment of the present invention.

FIG. 5 is a flexible characteristic diagram of a flywheel assembly according to an embodiment of the present invention.

FIG. 6 is a crankshaft bending angle-frequency characteristic diagram of the flywheel assembly.

FIG. 7 is a flywheel bending angle-frequency characteristic diagram of the flywheel assembly.

[Explanation of symbols]

1 flywheel assembly 3 crankshaft 4 flexible plate 5 flywheel 5a Friction surface 15 washer plate 21 Clutch disc assembly

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Claims (3)

(57) [Claims] 1. A clutch cover assembly and a clutch disc.
A flywheel assembly clutch device having a click assembly is mounted, a flywheel having a friction surface on the outer peripheral portion, the outer peripheral portion is fixed to the flywheel periphery is the crankshaft end within Rutotomoni It can be fixed, and in the direction of rotation
The flexible plate, which has high rigidity and low rigidity in the bending vibration direction, is placed between the flywheel and the flexible plate.
And the flexible plate is axially moved by a predetermined amount or more.
Can be contacted with the side surface of the flywheel when it bends upward
It has high rigidity and bending in the clutch release operating direction.
A flywheel assembly that includes an annular plate that has low rigidity in the direction . 2. The annular plate has a bent portion on the outer peripheral portion.
And the axial rigidity of the outer peripheral bent portion is
Higher than the axial rigidity of the kisible plate, invoice
The flywheel assembly according to Item 1 . 3. The flywheel is the annular plate.
When the vibration of the flywheel occurs in the bending direction,
The flywheel assembly according to claim 1 or 2, wherein the flywheel assembly is in sliding contact with the side surface of the ruler .