JP3336329B2 - Flexible flywheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible flywheel mounted on a rotating shaft, and more particularly to a flexible flywheel mounted on a crankshaft of an automobile or the like for suppressing vibration.

[0002]

2. Description of the Related Art A flywheel is attached to an end of a crankshaft used in an internal combustion engine, and the inertia of the flywheel is used to smoothly rotate the crankshaft. In the case where the flywheel vibrates due to vibration caused by a bending force or the like from a piston acting on the crankshaft, a flywheel called a flexible flywheel, such as that disclosed in Japanese Utility Model Laid-Open No. 6-51590, is used. Wheels are often used. This flexible flywheel has a structure in which a flywheel mass, which is a ring-shaped inertia member having a predetermined rate of inertia, is fixed to an elastically deformable flexible plate, and the flywheel mass is cranked through the flexible plate. It is attached to the shaft. Thus, the vibration of the crankshaft is absorbed and attenuated by the elastic deformation of the flexible plate.

[0003]

However, even in this case, vibration may not be suppressed due to, for example, occurrence of resonance at a constant rotational speed. In order to solve such a problem, an intermediate elastic member (for example, a disc spring) for damping is provided.
It is considered that the flywheel mass is attached to a crankshaft in the vicinity of the center of the flywheel mass by applying a preload, that is, an initial assembly stress, and abutting the same. This is intended to change the resonance point by changing the mounting elasticity of the flywheel mass to the crankshaft, improve the vibration damping characteristics, and suppress the vibration of the flywheel mass.
The reason for applying the initial assembly stress and thus bending the intermediate elastic member in advance is that the intermediate elastic member can follow the movement even when the flexible plate swings in any of the axial directions. To do that.

However, the above-described method of assembling the intermediate elastic member by applying initial assembly stress and elastically deforming has the following problems. First, there is a problem that the difficulty of assembling increases, for example, it is necessary to adjust the initial assembling stress applied to the intermediate elastic member during assembling. Further, depending on the resonance point and its amplitude, it may be necessary to increase the initial assembly stress by increasing the thickness of the intermediate elastic member or the amount of deflection at the time of assembly. However, there is a limit on the convenience of assembly to increase the initial assembly stress.In such a case, it is necessary to change the design of the entire system including the crankshaft, etc. There is also a problem that the restriction is imposed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems at once, the present invention provides an elastically deformable vibration damping plate attached to an inertia member and a flexible plate without applying a preload thereto. This is a flexible flywheel attached to a rotating shaft in contact with it, and is designed to contribute to simplifying assembly and increasing design flexibility.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a flexible plate that is elastically deformable, a flat disk-shaped damping plate made of a leaf spring material smaller than the flexible plate and elastically deformable, and a smooth rotation. A flexible flywheel comprising a ring-shaped inertial member for making the flexible plate attached to a rotating shaft,
The inertia member is fixed to the flexible plate, and the vibration damping plate has one surface in contact with the flexible plate, and the other surface facing the one surface is located near the center hole of the inertia member. And is attached to the rotary shaft by being in contact with and sandwiched between the inertial member and the flexible plate without applying a preload so as to make contact only with the rotary shaft.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the flexible flywheel according to the present embodiment includes a flat disk-shaped elastically deformable flexible plate 1 and a flat disk-shaped elastically deformable vibration damper having a smaller radius than the flexible plate 1. It is provided with a plate 2 and a flywheel mass 3 as an inertia member, and is attached to, for example, an end of a crankshaft 4 for an automobile as a rotation axis.

The crankshaft 4 is of a generally known type that converts the vertical movement of a piston in each cylinder of an engine (not shown) into rotation and outputs the rotation. In the present embodiment, a cylindrical projection 41 is provided on the end face 4a. In the meantime, around the projection 41, a plurality of female screw holes 4 are point-symmetrical with respect to the axis.
2 and a reamer hole 43 for a knock pin is provided at one place.

As shown in FIGS. 1 and 3, the flexible plate 1 has a projection 4
1 and a bolt insertion hole 12 and a reamer hole 13 are provided at positions corresponding to the female screw hole 42 and the reamer hole 43 of the crankshaft 4, respectively. Also, near the outer periphery, a plurality of bolt insertion holes 14 and a plurality of reamer holes 1 are symmetrical with respect to the center.
5 are provided.

The vibration damping plate 2 is made of, for example, a leaf spring material, and as shown in FIGS. 1 and 4, is provided with a mounting hole 21 at its center to be fitted into a projection 41 of the crankshaft 4 and a crankshaft. The bolt insertion hole 2 is formed in a portion corresponding to the female screw hole 42 and the reamer hole 43 of the shaft 4.
2 and a reamer hole 23 are provided. As shown in FIGS. 1 and 2, the flywheel mass 3 is a ring-shaped member having a predetermined coefficient of inertia, and is provided at a portion corresponding to the bolt insertion hole 14 and the reamer hole 15 of the flexible plate 1 near its outer periphery. A female screw hole 32 and a reamer hole 33 are provided. Further, on the surface on the female screw hole 32 side, near the center hole 31, the outer diameter thereof is larger than that of the vibration damping plate 2, and the depth dimension 34 t thereof is
Is provided with a concave portion 34 having a thickness substantially equal to the thickness of the concave portion 34.

Next, an example of an assembling procedure will be described. In addition,
This procedure is merely an example, and the present invention is not limited to this procedure, and the procedure for assembling other parts is omitted. First, the flat washer 5 is fitted into the projection 41 of the crankshaft 4. As shown in FIG. 5, the flat washer 5 has, like the flexible plate 1, a mounting hole 51 at the center thereof to be fitted into the projection 41 of the crankshaft 4, a female screw hole 42 and a reamer hole 43 of the crankshaft 4. The bolt insertion hole 52 and the reamer hole 53
Are provided.

Next, the mounting holes 11 and 21 of the flexible plate 1 and the vibration damping plate 2 are inserted into the projections 41 of the crankshaft 4 in this order, and the respective reamer holes 53 and 1 are inserted.
3 and 23 are aligned. Then, a knock pin 6 (a slotted spring pin in this embodiment) is mounted in each of the reamer holes 53, 13, and 23, and the flat washer 5, the flexible plate 1, and the vibration damping plate 2 are bolted by the bolt 7. Fasten together with the crankshaft 4 and attach it. Thus, the flexible plate 1 and the vibration damping plate 2 are brought into surface contact.

Next, the flywheel mass 3 is attached to the flexible plate 1. For this, first, the position of the reamer hole 33 of the flywheel mass 3 is matched with the position of the corresponding reamer hole 15 of the flexible plate 1. Then, a knock pin (not shown) (slotted spring pin in this embodiment) is mounted in these reamer holes 15 and 33, and the flywheel mass 3 is fastened to the flexible plate 1 by bolts 9. At this time, the bottom surface 34a of the concave portion 34 of the flywheel mass 3 and the surface 2a of the damping plate 2 on the side opposite to the flexible plate 1 are in surface contact.

According to the above-described procedure, the flexible flywheel is mounted on the crankshaft 4. At this time, the damping plate 2 is attached to the flywheel mass 3 and the damping plate 2 without applying any stress. It is attached to the crankshaft 4 while being held and held.
The flexible flywheel thus configured does not require a preload, that is, an initial assembly stress, to be applied to the damping plate during assembly, and does not need to be elastically deformed. It will be easier. Further, the elasticity of the damping plate 2, which is limited by the initial assembly stress, that is, the material, thickness, and the like are not limited. Therefore, the natural frequency of the flexible flywheel can be changed, and the degree of freedom in design can be increased when, for example, the problem caused by resonance is eliminated.

Further, as shown in FIG. 1, the vibration damping plate 2 is divided into a flywheel mass 3 and a flexible plate 1.
Not only suppresses the vibration of the flywheel mass 3 only by the elasticity of the damping plate 2 but also contacts the contact surfaces 2b, 1a between the damping plate 2 and the flexible plate 1. It is also suppressed by friction at the contact surfaces 2a and 34a between the vibration damping plate 2 and the flywheel mass 3. That is, since a friction damping effect due to friction between the surfaces is obtained, the vibration damping characteristics of the flexible flywheel can be further improved. Of course, it goes without saying that this function acts on both flexures of the flexible plate 1 in the axial direction.

Further, in the case of a manual transmission type automobile, the feeling adjustment at the time of connection and disconnection of the clutch 10 which is further attached to the flywheel mass 3 on the side opposite to the crankshaft is adjusted by the disc spring described in the conventional example. There is an additional effect that it is simpler than the method.
Note that the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the mounting method and shape of the vibration damping plate, the flywheel mass, and the flexible plate are not limited to the embodiments. Of course, the present invention has a similar effect when applied to a rotating shaft other than the crankshaft.

In addition, the configuration of each section is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0018]

The present invention is embodied in the form described above and has the following effects. That is, in the flexible flywheel according to the present invention, the elastically deformable vibration damping plate is attached to the rotary shaft while being attached to the inertia member and the flexible plate without applying a preload thereto. Therefore, according to the present invention, assembling becomes very easy, for example, stress adjustment at the time of assembling becomes unnecessary. In addition, the degree of freedom in design in the case of eliminating problems due to resonance is also increased. Furthermore, since the vibration of the inertia member is also suppressed by the friction at the contact surface between the vibration suppression plate and the inertia member or the flexible plate, a friction damping effect by the vibration suppression plate is obtained, and the vibration damping characteristics are further improved. it can. Of course, it goes without saying that this function acts on either axial movement of the flexible plate.

[Brief description of the drawings]

FIG. 1 is a schematic vertical end view showing an internal structure of a flexible flywheel showing one embodiment of the present invention.

FIG. 2 is a front view of the flywheel mass in FIG. 1 as viewed from a crankshaft side.

FIG. 3 is a front view of the flexible plate in FIG. 1 as viewed from a crankshaft side.

FIG. 4 is a front view of the vibration damping plate in FIG. 1 as viewed from a crankshaft side.

FIG. 5 is a front view of the flat washer in FIG. 1 as viewed from a crankshaft side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flexible plate 2 ... Vibration suppression plate 3 ... Inertial member (flywheel mass) 4 ... Rotation axis (crankshaft)

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Claims (1)

(57) [Claims] An elastically deformable flexible plate;
A leaf spring that is smaller than the flexible plate and can be elastically deformed
A flat disk-shaped vibration suppression plate made of a material , a flexible flywheel comprising a ring-shaped inertial member for smooth rotation, attaching the flexible plate to a rotating shaft, While fixing the inertial member to the flexible plate, the vibration damping plate,
One surface thereof is in contact with the flexible plate, and the other surface opposite to the one surface is located near the center hole of the inertial member.
A flexible flywheel which is attached to a rotary shaft by being sandwiched between an inertial member and a flexible plate without applying a preload so as to make contact only with the rotating shaft.