KR19990080420A - Vibration suppressor of flywheel - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to a flywheel assembly, and more particularly, to a vibration suppression device for suppressing bending vibration of a flywheel mounted on a crankshaft.

I. The technical problem that the invention is trying to solve.

An object of the present invention is to provide a vibration suppressing device of a flywheel assembly for improving the bending vibration absorbing ability of the flexible plate.

All. Summary of the Solution of the Invention.

A flywheel assembly for transmitting torque from a crankshaft of an engine to a clutch assembly, comprising: a flywheel having a friction surface in contact with a clutch disc, and a flexible plate having inner and outer diameter portions fixed to the crankshaft and the flywheel, respectively. And an inner diameter portion is fixed to the inner diameter portion of the flexible plate and an outer diameter portion is formed of a washer fixed to the outer diameter portion of the flexible plate by a retainer, so that bending vibration transmitted through the crankshaft is absorbed when the engine is driven. do.

la. Important use of the invention.

The present invention is used in flywheel assembly.

Description

Vibration suppressor of flywheel

The present invention relates to a flywheel assembly, and more particularly, to a vibration suppression device for suppressing bending vibration of a flywheel mounted on a crankshaft.

The driving force transmission order of a typical vehicle is as follows. When fuel in the engine combustion chamber explodes and the piston descends, the force of the piston rotates the crankshaft through the connecting rod. Subsequently, the flywheel coupled to the output end of the crankshaft rotates. At this time, the rotational force transmitted from the crankshaft while the friction surface of the flywheel comes into contact with the clutch disk is transmitted to the transmission (in the case of an automatic transmission, The role). In addition, the flywheel is provided with a ring gear serves to start the engine.

Acceleration and centrifugal force act on the crankshaft which converts the linear driving force generated in the engine into the rotational force as described above, under the influence of the acceleration and deceleration movement of the connecting rod and the piston. The bending vibration is also transmitted to the flywheel coupled to the output end of the crankshaft. This bending vibration is transmitted to the engine mount through the engine block, which not only causes vibration and noise throughout the vehicle, but also increases the risk of the crankshaft and flywheel being destroyed by resonance. Flexible plates were used to reduce the bending vibrations occurring in the wheels.

The flexible plate is a thin disk-shaped member and is mounted between the crankshaft and the flywheel to absorb bending vibration when the bending vibration generated in the crankshaft is transferred to the flywheel. The flexible plate has a high rigidity in the rotational direction but a low rigidity in the bending vibration direction. Thus, a flexible plate having a low rigidity in the bending vibration direction absorbs the bending vibration when the bending vibration is transmitted within a certain limit from the crankshaft. It is effective in preventing noise caused by bending vibration and protecting power transmission members (for example, crankshaft and flywheel) in the engine from resonance.

On the other hand, as the flexible plate has a thin thickness, the rigidity of the bending vibration direction is low, and thus the ability to absorb bending vibration is improved. There is also a limit to absorbing bending vibration. Flywheel assemblies with such flexible plates are described in detail in US Pat. No. 5,253,740, "Automotive Power Train with Annular Elastic Body for Reducing Vibrations of Flywheel Assembly."

When excessive bending vibration is exceeded and generated from the crankshaft to the flexible plate having the above limitation, the flexible plate does not absorb the entire bending vibration transmitted to it. Therefore, the bending vibration that is not absorbed by the flexible plate remains on the flywheel and the crankshaft as it is, causing severe noise to the vehicle, and may also cause breakage of the crankshaft or flywheel due to resonance if the vibration continues. There was a problem.

An object of the present invention to solve the above problems is to provide a vibration suppression apparatus of a flywheel assembly for improving the bending vibration absorption capacity of the flexible plate.

In order to achieve the above object, the present invention provides a flywheel assembly for transmitting torque from the crankshaft of the engine to the clutch assembly,

A flywheel having a friction surface in contact with the clutch disk, a flexible plate having an inner diameter and an outer diameter fixed to the crankshaft and the flywheel, respectively, and an inner diameter fixed to the inner diameter of the flexible plate, the outer diameter being retained by a retainer. Consists of a washer fixed to the outer diameter portion of the flexible plate, it characterized in that the bending vibration transmitted through the crankshaft is absorbed when the engine is driven.

1 is a cross-sectional view and a partially enlarged view showing a flywheel assembly and a clutch assembly according to a preferred embodiment of the present invention;

Figure 2a is a perspective view of a circular head press pin according to a first embodiment of the present invention,

Figure 2b is a perspective view of a round head screw according to a second embodiment of the present invention,

3a is a perspective view of a square head press-fit pin according to a third embodiment of the present invention,

3b is a perspective view of a square head screw according to a fourth embodiment of the present invention,

4 is a perspective view of a ring retainer according to a fifth embodiment of the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a cross-sectional view and a partially enlarged view showing a flywheel assembly and a clutch assembly according to a preferred embodiment of the present invention, Figures 2a to 4 are each a circular head press pin, a circular head screw, a square according to an embodiment of the present invention A perspective view showing a head press pin, a square head screw and a ring retainer.

1 shows a flywheel assembly 10 is coupled to the clutch assembly 30 in accordance with an embodiment of the present invention. The flywheel assembly 10 is coupled to the crankshaft 20 and has a flexible plate 12, flywheel 18 and washer 40.

The flexible plate 12 is a thin disk-shaped member, which consists of an inner diameter portion 12a and an outer diameter portion 12b, forms a hole in the center of the inner diameter portion 12a, and a ring gear 14 is provided on the outer circumferential surface of the outer diameter portion 12b. The inner diameter portion 12a of the flexible plate 12 is fixed to the crank flange 21 formed at one end of the crank shaft 20 by a plurality of bolts 49. The flexible plate 12 has a high rigidity with respect to the rotational direction of the crank shaft 20 while a low rigidity with respect to the bending vibration direction, and has a displacement in the bending vibration direction when the bending vibration is transmitted from the crank shaft 20.

The flywheel 18 is a disk-shaped member, the inner surface of which is fixed to the outer diameter portion 12b of the flexible plate 12 with a bolt 16, and the outer surface forms a friction surface in contact with the clutch disk 35 to clutch the rotational force of the crankshaft 20. Pass it to assembly 30.

The washer 40 is a circular member having elasticity and includes an inner diameter portion 40a and an outer diameter portion 40b, and the inner diameter portion 40a is fixed to the outer surface of the inner diameter portion 12a of the flexible plate 12 fixed to the crankshaft 20 by a plurality of bolts 49. The outer diameter portion 40b is coupled to an end portion of the retainer 41 inserted in the inner surface direction of the outer diameter portion 12b of the flexible plate 12. The outer diameter portion 40b of the washer 40 is bent toward the flexible plate 12. In this case, as the retainer 41, the circular head press pin 42, the round head screw 43, the square head press pin 44, the square head screw 45 and the ring retainer 48 shown in FIGS. 2A to 4 may be selectively used. The ring retainer 48 is formed of a ring 46 having a flat bottom surface as shown in FIG. 4 and a plurality of pins 47 protruding from the bottom surface of the ring.

On the other hand, a gap a and a gap b are provided between the head portion of the retainer 41 and the outer diameter portion 12b of the flexible plate 12, and between the outer diameter portion 12b of the flexible plate 12 and the outer diameter portion 40b of the washer 40, respectively. This gap allows the flexible plate 12 to move within the gap a or b in the bending vibration direction, thereby allowing the bending vibration transmitted from the crankshaft 20 to self absorb. On the other hand, when excessive bending vibration is transmitted to the flexible plate 12, the outer diameter portion 12b of the flexible plate 12 comes into contact with the head portion of the retainer 41 or the outer diameter portion 40b of the washer 40.

The clutch assembly 30 coupled to the flywheel assembly 10 includes a clutch cover 31 fixed to an outer surface of the flywheel 18, a diaphragm spring 32 connected to a pivot ring 34 mounted on the clutch cover, and a diaphragm spring. A pressure plate 33 mounted about the pivot ring 34 at the other end, and a clutch disc 35 in contact with the friction surface of the flywheel when pressed by the pressure plate.

Then, the operation of the flywheel assembly 10 and the clutch assembly 30 according to the features of the present invention will be described with reference to FIG.

Bending vibrations generated by the engine drive are transmitted through the crankshaft 20 to the flywheel 18. Since the bending vibration direction displacement of the flexible plate 12 is small when the bending vibration is small, the flexible plate 12 absorbs the bending vibration transmitted to the flexible plate itself without contacting the head portion of the retainer 41 or the outer diameter portion 40b of the washer 40. .

On the other hand, when the bending vibration increases, the bending vibration direction displacement of the flexible plate 12 also increases. Accordingly, the flexible plate 12 bent in the bending vibration direction is in contact with the head portion of the retainer 41 or the outer diameter portion 40b of the washer 40, and the bending vibration transmitted to the flexible plate 12 is absorbed by the friction force generated at this time. As described above, the flexible plate 12 having the washer 40 according to the present invention does not need to reduce the thickness in order to lower the rigidity of the bending vibration direction, thereby maintaining the durability against external force while absorbing the bending vibration with the same thickness. have.

As described above, in the vibration suppression apparatus of the flywheel assembly according to the embodiment of the present invention, a flexible plate and a washer fixed to the flexible plate by a retainer fixed to the flexible plate absorb the bending vibration even when excessive bending vibration occurs in the crankshaft. It is possible to reduce the vibration and noise generated in the vehicle to improve the riding comfort and to prevent the power transmission member such as the crankshaft and the flywheel from being damaged by resonance.

In addition, the vibration suppressing apparatus of the flywheel assembly according to the embodiment of the present invention prevents the clutch disc surface from being worn due to the contact of the flywheel with the clutch disk by suppressing the flywheel from excessively moving in the bending vibration direction, thereby causing the clutch assembly to be worn. There is an effect of improving the intermittence of the.

Claims (5)

A flywheel assembly for transmitting torque from a crankshaft of an engine to a clutch assembly, A flywheel having a friction surface in contact with the clutch disc, A flexible plate having an inner diameter portion and an outer diameter portion fixed to the crank shaft and the flywheel; The inner diameter part is fixed to the inner diameter part of the flexible plate and the outer diameter part consists of a washer fixed to the outer diameter part of the flexible plate by a retainer, Vibration suppression apparatus of the flywheel assembly, characterized in that the bending vibration transmitted through the crankshaft is absorbed when the engine is driven. The method of claim 1, The retainer is a vibration suppression device of a flywheel assembly, characterized in that for fixing the flexible plate and the washer between the head portion of the retainer and the outer diameter portion of the flexible plate and between the outer diameter portion of the flexible plate and the outer diameter portion of the washer. The method of claim 1, The retainer is a vibration suppression device of a flywheel assembly, characterized in that the circular head press-fit pin or square head push-in pin. The method of claim 1, The retainer is a vibration suppression device of a flywheel assembly, characterized in that the round head screw or square head screw. The method of claim 1, The retainer is a vibration suppression device of a flywheel assembly, characterized in that the ring shape protruding a plurality of pins at equal intervals in a flat circular ring base.