JPH0544780A - Torsional damper - Google Patents

Abstract

PURPOSE:To provide a torsional damper that has heightened a damping effect as a whole in making a peak of clamping force generable with more than two natural frequencies. CONSTITUTION:More than two inertial masses 9, 11 are installed in a ring recess 7 via each of rubber goods 8, 10, and each mass of these inertial masses 9, 10 and/or each spring constant of these rubber goods 8, 10 are changed so as to make each set paired with these rubber goods 8, 10 and the inertial masses 9, 11 so as to have different natural frequencies each.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped member fixed to a rotary shaft such as a crank shaft, in which an inertial mass is provided via rubber and a viscous fluid is sealed therein. The present invention relates to a torsional damper that damps torsional vibration by a dynamic damper function due to inertial mass and enhances the damping effect by viscous fluid.

[0002]

2. Description of the Related Art As a conventional torsional damper of this type, as shown in FIG. 6, a disc-shaped member 2 is fixed to a rotary shaft 1 such as a crankshaft, and a rubber 3 is attached to the disc-shaped member 2. Inertia masses 100 and 101 are connected to each other through a gap 4 formed between the rubber 3 and the outer peripheral edge side of the disk-shaped member 2 and the inertial masses 100 and 101, and the viscous fluid L is enclosed in the gap 4. Are known.

[0003]

In the conventional example shown in FIG. 6, the inertial masses 100 and 101 function as one mass, and the peak of the damping force can be produced only at a constant natural frequency.

Therefore, an object of the present invention is to provide a torsional damper capable of exhibiting damping force peaks at two or more different natural frequencies and enhancing the damping effect as a whole.

[0005]

In order to achieve the above-mentioned object, the present invention forms a cylindrical portion on one side or both sides of a disk-shaped member fixed to a rotary shaft such as a crankshaft, and at the same time, the inner circumference of the cylindrical portion. Is located at one side or both sides of the disc-shaped member to form an inner cylindrical portion to provide an annular recess, and an inertial mass is provided in the annular recess via rubber, and a viscous fluid is provided in a gap between the disc-shaped member. In the enclosed torsional damper, two or more inertial masses are provided in the annular recess via rubbers respectively, and the inertial masses of the inertial masses are set so that each set of the rubber and the inertial mass has a different natural frequency. The mass and / or the spring constant of rubber are changed.

[0006]

Since one rubber and one inertial mass constitute one set of damping means, and there are two such means, and each set has a different natural frequency, at a certain natural frequency, ,
One set of damping means will provide a peak of damping force, and at another natural frequency another set of damping means will provide a peak of damping force, improving the damping effect as a whole.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, a cylindrical portion 5 is formed on one side of a disk-shaped member 2 fixed to a rotary shaft 1 such as a crank shaft shown in FIG. An inner cylindrical portion 6 is formed on one side of the disk-shaped member 2 located on the inner periphery to provide an annular recessed portion 7, and an inertial mass 9 is provided in the annular recessed portion 7 via a rubber 8 and via a rubber 10. Inertial mass 11 is provided. The rubber 8 and the inertial mass 9 form one set of damping means, and similarly, the rubber 10 and the inertial mass 11 form another set of damping means. A sleeve 12 is provided between the inner peripheral surface of the cylindrical portion 5 and the rubber 8, and a sleeve 13 is provided between the outer peripheral surface of the inner cylindrical portion 6 and the rubber 10.
Further, between the inertial masses 9 and 11, there is provided a rubber 14 which is extremely soft as compared with the rubbers 8 and 10, that is, a rubber 14 having a very small spring constant. Disc-shaped member 2 and inertial mass 9, 11
A gap 4 is formed between the rubbers 8, 14, 10 and the sleeves 12, 13 and the viscous fluid L is enclosed in the gap 4. The disk-shaped member 2 is formed with a hole 15 for injecting the viscous fluid L into the gap 4. This hole 15 is designed to be closed after enclosing the viscous fluid L. Two sets of damping means provided in the annular recess 7, that is, each set of the rubber 8 and the inertial mass 9 and the rubber 10 and the inertial mass 11 have masses of the inertial masses 9 and 11 and / or so that they have different natural frequencies. Alternatively, the spring constants of the rubbers 8 and 10 are changed. As described above, the rubber 14 provided in the middle has an extremely small spring constant so as not to affect the respective damping means.

In the embodiment shown in FIG. 1, first, as shown in FIG. 2, the sleeve 12, the rubber 8, the inertial mass 9, the rubber 14, the inertial mass 11, the rubber 10 and the sleeve 13 are integrally molded by vulcanization adhesion. Then, the one integrated by vulcanization bonding shown in FIG. 2 is set in the annular recess 7, and after setting, the distal ends of the cylindrical portion 5 and the inner cylindrical portion 6 are caulked, and the sleeves 12, 13 are formed.
Do not come out (see Fig. 3). After forming the one as shown in FIG. 3, the hole 15 is formed in the disc-shaped member 2,
The viscous fluid L is injected from this hole 15 into the gap 4, and then the hole 15 is closed.

In another embodiment shown in FIG. 5, cylindrical portions 5 are formed on both sides of the disk-shaped member 2, and inner cylindrical portions are formed on both sides of the disk-shaped member 2 at the inner circumference of the cylindrical portion 5. 6 are formed respectively, and the annular recesses 7 are formed on both sides of the disk-shaped member 2.
These annular recesses 7 are provided with sleeves 12 and 13, respectively, which support the inertial mass 9 with rubbers 8A and 8B.
The inertial mass 11 is supported by 0A and 10B. A hole 16 for injecting the viscous fluid L is formed in the inertial mass 9, the viscous fluid L is injected from the hole 16 into the gap 4, and the hole 16 is closed after the injection. In this embodiment, holes are made in the disc-shaped member 2 so that the gaps 4 communicate with each other.

In both of the embodiments described above, the disc-shaped member 2 is provided with two damping means on one side and the disc-shaped member 2 is provided with one damping means on each side. But,
There may be two or more damping means. Also, each damping means may be configured so as to have an effect on torsional vibration and bending vibration.

[0012]

As described above, according to the present invention, two or more inertial masses are provided in the annular recess via rubbers, and the rubbers and the inertial masses are different from each other. Since the mass of the inertial mass and / or the spring constant of the rubber is changed so as to have a natural frequency, two or more damping means each have a separate damping effect, and the damping effect can be enhanced as a whole. is there.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a damping means in a vulcanized and bonded state.

FIG. 3 is a cross-sectional view showing a state in which the one shown in FIG. 2 is set in an annular recess of a disc-shaped member and the cylindrical portion and the inner cylindrical portion are caulked.

FIG. 4 is a cross-sectional view before a viscous fluid is sealed in the gap.

FIG. 5 is a cross-sectional view showing another embodiment.

FIG. 6 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Rotation axis 2 Disc-shaped member 4 Gap 5 Cylindrical part 6 Inner cylindrical part 7 Annular recess 8,8A, 8B Rubber 10,10A, 10B Rubber 9,11 Inertial mass

Claims (1)

[Claims] 1. A cylindrical portion is formed on one side or both sides of a disk-shaped member fixed to a rotary shaft such as a crankshaft, and an inner cylindrical portion is located on the inner circumference of the cylindrical portion on one side or both sides of the disk-shaped member. In this torsional damper in which an annular recess is formed to provide an inertial mass in the annular recess via rubber and a viscous fluid is sealed in a gap between the disk-shaped member and the annular recess, two or more inertial masses are provided in the annular recess. Is provided via rubber, and the mass of the inertial mass and / or the spring constant of the rubber is changed so that each set of the rubber and the inertial mass has a different natural frequency. Torsion damper to do.