JP2606291Y2 - 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 flywheel used for a power transmission system of an automobile engine or the like, and more particularly to a flywheel having a dynamic damper for reducing torsional vibration.

[0002]

2. Description of the Related Art An automobile engine transmits the energy of an intermittently generated explosion to the outside through a crankshaft as a driving torque. For this reason, this type of engine has a problem that the driving torque transmitted to the power transmission system includes a fluctuation torque due to the explosion, and the fluctuation torque easily induces torsional vibration of the power transmission system.

[0003] To address this problem,
For example, a flywheel as disclosed in JP-A-57-67141 has been developed.

As shown in FIGS. 3 and 4, the flywheel has a cocoon-shaped flywheel body 1 whose inner peripheral edge is directly connected to a drive shaft (not shown) such as a crankshaft.
Alternatively, a plurality of circular space portions 2 are provided at equal intervals in the circumferential direction, and each of the space portions 2 has a structure in which a cylindrical roller 3 as a single pendulum is housed. The space 2 and the cylindrical roller 3 that rolls inside the space 2 constitute a dynamic damper. The torsional vibration of the power transmission system is reduced by resonating the cylindrical roller 3 with torsional vibration.

[0005] It is known that a bending vibration due to a fluctuating torque is easily generated in a power transmission system in addition to the torsional vibration. For this reason, as a countermeasure against this, conventionally, for example, the one shown in Japanese Utility Model Publication No. 2-8117 has been devised.

In this flywheel, as shown in FIGS. 5 and 6, a curved surface 2a curved in the direction around the axis and a curved surface 2b curved in the axial direction are provided on the wall surface of the space portion 2.
A ball 4 is housed in the space 2 as a simple pendulum. The ball 4 and the space 2 constitute a dynamic damper against both torsional and bending vibrations, and reduce the vibration of the power transmission system by resonating the rolling along the curved surfaces 2a and 2b of the ball 4 with each vibration. It has become.

[0007]

In the case of the above-mentioned conventional flywheel, although both torsional vibration and bending vibration can be reduced, the curved surface 2b is formed in addition to the high degree of freedom of rolling of the ball 4. Since the axial width of the flywheel main body 1 is limited as much as possible, there is a problem that it is difficult to make settings at the time of manufacturing to effectively reduce bending vibration.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flywheel capable of reliably reducing torsional vibration and bending vibration with a simple structure that is easy to manufacture.

[0009]

SUMMARY OF THE INVENTION The present invention provides a flywheel having a dynamic damper for reducing torsional vibration as means for solving the above-mentioned problems.
A recess is formed on one side of the flywheel body ,
Constructing a dynamic damper by accommodating rolling elements in recesses
On the other hand, the outer edge of the elastic plate having high rigidity in the rotation direction and low rigidity in the bending direction is connected to one side of the flywheel body.
Surface, and connect the center side of the elastic plate to the drive shaft, and attach the flywheel body to the outer edge of the elastic plate.
Was closed .

[0010]

The torsional vibration is reduced by the dynamic damper, and the bending vibration is reduced by the elasticity of the elastic plate in the bending direction. The setting of the frequency of the bending vibration and the like is changed by changing the thickness, material, and the like of the elastic plate in order to reduce the vibration.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

In the drawings, reference numeral 10 denotes a flywheel body of the flywheel according to the present invention. The flywheel body 10 is formed of a ring-shaped mass body, and has a cocoon having a curved surface 11a that is curved in the rotation direction on one side surface.
A plurality of concave portions 11 having a shape are formed at equal intervals in the circumferential direction. Each recess 11 functions as a simple pendulum.
A cylindrical roller 12 is rotatably accommodated as a rolling element . The recess 11 and the cylindrical roller 12 constitute a dynamic damper 13 for reducing torsional vibration.
2 is set to resonate with torsional vibration.

A substantially disk-shaped elastic plate 14 having high rigidity in the rotating direction and small rigidity in the bending direction is attached to the side surface of the flywheel body 10 on the side of the concave portion 11. The elastic plate 14 is formed to have substantially the same diameter as the flywheel main body 10, and its outer edge is formed by a plurality of bolts 15 at a position near the concave portion 11 of the flywheel main body 10 (substantially the middle of the concave portions 11, 11 adjacent on the circumference) Position). Therefore, the outer edge of the elastic plate 14 is always reliably
1 is closed to prevent the cylindrical roller 12 from dropping from the recess 11. On the other hand, the inner peripheral edge of the elastic plate 14 is
Along with 6, a bolt 18 is connected to an end face of a crankshaft 17 as a drive shaft, so that the driving torque of the engine is input from the inner peripheral edge side. The reinforcing member 16 has a cylindrical portion 16b and a flange portion 16c on the outer periphery of a base portion 16a pressed against the elastic plate 14, and the cylindrical portion 16b is inserted into a center hole 19 of the flywheel body 10 to have a radius of the flywheel body 10. Direction displacement, and the flange portion 16c is
Is regulated in the axial direction.

Reference numeral 20 denotes a ring gear which is connected to the outer peripheral portion of the elastic plate 14 and meshes with a pinion gear (not shown) of the starter motor when the engine is started.

Since the flywheel is configured as described above, when the crankshaft 17 rotates, the flywheel body 10 can be reliably rotated via the elastic plate 14 having a large rigidity in the rotational direction. At this time, when the torsional vibration of the crankshaft 17 is input to the flywheel body 10 together with the driving torque, the dynamic damper 1
3 resonates with this vibration and the concave roller 1
1 and the torsional vibration is reduced by the resonance of the cylindrical roller 12. The bending vibration of the crankshaft 17 is caused by the crankshaft 17 and the flywheel body 10.
Is reduced by the elasticity in the bending direction of the elastic plate connecting the two.

The flywheel has an elastic plate 14 attached to the flywheel body 10 to reduce bending vibration by the elastic plate 14, so that the structure is simple and the manufacture is extremely easy. . In addition, in the case of this flywheel, the torsional vibration and the bending vibration are reduced separately by the dynamic damper 13 and the elastic plate 14, so that the setting of each part for effectively reducing each vibration can be easily and accurately adjusted. Can be. For example, setting adjustment for bending vibration can be performed by changing the thickness or material of the elastic plate 14. Furthermore, in this flywheel, since the elastic plate 14 for reducing bending vibration also serves as a lid for the concave portion 11 for preventing the cylindrical roller 12 from falling off , the number of parts does not increase, and the manufacturing cost is reduced. There is also an advantage that reduction can be performed.

The embodiments of the present invention are not limited to those described above. For example, the shape of the concave portion 11 forming the dynamic damper 13 may be circular,
It is also possible to adopt a sphere instead of.

[0018]

As described above, according to the present invention, a concave portion is formed on one side surface of the flywheel body, and a rolling element is accommodated in the concave portion to constitute a dynamic damper. Attach the outer edge of the elastic plate with small rigidity in the bending direction to one side of the flywheel body,
The center portion of the elastic plate is connected to the drive shaft, and the outer edge of the elastic plate closes the concave portion of the flywheel body. With the dynamic damper, the bending vibration can be reliably reduced by the elasticity of the elastic plate in the bending direction, and the falling of the rolling element from the concave portion can be increased by increasing the number of parts and reducing the axial dimension of the flywheel.
It is possible to reliably prevent the problem by using the elastic plate without causing a problem such as increase . Also, the present invention
The damper will be supported on the drive shaft via the elastic plate
Therefore, the rolling element against the damper chamber side wall during bending vibration
Of the rolling element, thereby smoothing the rolling of the rolling element
To improve the torsional vibration absorption characteristics.
This has the effect of

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 2 showing one embodiment of the present invention.

FIG. 2 is a front view showing the same embodiment.

FIG. 3 is a front view showing a conventional technique.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a front view showing another conventional technique.

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

[Explanation of symbols]

 10: flywheel body, 13: dynamic damper, 14: elastic plate, 17: crankshaft (drive shaft).

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-5-118383 (JP, A) JP-A-4-3146 (JP, U) JP-A-3-26852 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) F16F 15/12-15/36

Claims (1)

(57) [Scope of request for utility model registration] 1. A flywheel having a dynamic damper for reducing torsional vibration, wherein a recess is formed on one side surface of a flywheel body , and a rolling element is provided in the recess.
Elastic plate with high rigidity in the rotation direction and low rigidity in the bending direction while constituting a dynamic damper
Of the flywheel to one side of the flywheel body
Only, co Combining the center portion of this elastic plate to the drive shaft
In addition, the outer edge of this elastic plate
A flywheel that is closed .