JPH03229036A - Dynamic damper - Google Patents

Abstract

PURPOSE:To simultaneously reduce oscillations both in twisting and bending directions with a mass member alone without increasing the weight by mutually dislocating an elastic center of rubber-like elastic members and the center of gravity of the mass member in a direction of axis of a torque transmission tube. CONSTITUTION:A solid and cylindrical weight 4 as a mass member is provided in a propeller shaft 1 through a pair of tubber-like elastic members 2, 3 concentrically with the shaft 1. On both ends of the weight 4, its projecting rates l1, l2 from the rubber-like elastic members 2, 3 are different from each other, so that elastic center P2 of the rubber-like elastic members 2, 3 is dislocated from the center of gravity P1 of the weight 4 with a specified offset rate (e) in a direction of axis of the propeller shaft 1. Elastic center P2 of the rubber- like elastic members 2, 3 in a twisting direction is offset in reference to the center of gravity P1 of the weight 4, so that the weight 4 is oscillated with a complex oscillating mode of twisting of twisting and bending directions by the rubber-like elastic members 2, 3 as springs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a Quinamino tamper used in the power transmission system of an automobile.

Conventional Technology In order to improve the vibration characteristics by reducing the torsional vibration and bending vibration of the torque transmission tube in the power transmission system of an automobile, such as the torsional vibration and bending vibration of the propeller shaft (vibration in the direction perpendicular to the axis of the propeller shaft), for example, as shown in FIG. As shown in (A) and (B), it is possible to add a so-called dynamic damper by concentrically providing the material 4 on the inner periphery of the propeller shaft 1 via a rubber elastic body 2.3. (For example, "Automatic Chuo Gaku Zenshu 9 Volume Power Transmission Device-1," (1982).
11.20), Sankaido, P297, and Jitsukaisho 63-
No. 196849).

Problems to be Solved by the Invention In such a conventional Quinaminok tamper, as is clear from FIG. Because of this, the frequency eigenvalue of the torsional vibration or bending vibration that produces the Tinaminoku damper effect is single, so for example, when trying to obtain a vibration reduction effect in both the twisting and bending directions In this case, a mass member 4 must be provided separately for each twisting direction and bending direction, which results in an increase in the number of small pieces of the propeller 7 and the entire vehicle.

On the other hand, it is also possible to obtain eigenvalues of 1- in two directions, the twisting direction and the bending direction, with only one mass member 4 [1]
In that case, due to constraints such as the spring ratio between the torsion direction and the bending direction of the rubber-based elastic bodies 2 and 3, it is likely that the Kuinaminoktamber effect is obtained. +11 + +1 to the way (71) (
It has to be iff. As a result, in the torsion direction and bending direction)
Each 111 + 1 is 1 value or it is necessary to request medium meat.
'l, and it becomes impossible to obtain a vibration reduction effect of +Ui i in both the twisting direction and the bending direction at the same time.

The present invention is as follows. This was done in view of the large length, lW, +14, so the purpose is to use mass members. ) Naka t′, the stiffness Jj
It is an object of the present invention to provide a tamper-resistant tamper that can simultaneously reduce vibration by the necessary 1'' for both i+1 and h'' in the direction of bending force.

Means for Solving the Problems The present invention provides rubber-based 'r11! Quality 11 through the sexual body
1) In a structure in which the material is concentric with the torque transmission tube, the elastic center in the torsional direction of the rubber-based dqi material and the 1F center of the mass member are shifted in the axial direction of the torque transmission tube. It is characterized by:

Offset to mutually shift the elastic center of To 1 and the center of gravity of Material 1; For J soil, set according to each eigenvalue of the vibration frequency where you want to obtain the Quinaminoku tamper effect in the torsional and bending directions. do.

Function When using such a structure, the quality fit member vibrates due to the coupled vibration mode in the torsional direction and the bending direction, so the characteristic (1+'i) of the bending direction is Also, the characteristic (11!) of the twisting method ii'l is the elastic center and quality of the rubber-based elastic body; Since there is no change in comparison with before shifting, it is possible to lower the 1.'il self-value in the bending direction as shown in L. fII′
This is especially effective when a higher stiffness value in the torsion direction than I' is required, and a necessary and sufficient vibration reduction effect can be obtained simultaneously in both the torsional direction and the bending direction.

Embodiment Figures 1 (]\) and (B) show an embodiment of the present invention, in which a propeller/set 1 serving as a torque transmission team contains springs of the same size and number. A solid cylindrical weight 4 as a mass member is arranged concentrically with the propeller/set 1 via a pair of rubber elastic bodies 2 and 3. Then, at both ends of the weight 4, the protrusion amount CI, σ2 of the rubber elastic bodies 2, 3 and the weight 4 itself
By making C1 different from each other, as shown in the same figure (B), the elastic centers of the elastic bodies 2 and 3) are set at a predetermined offset with respect to the small center of the weight 4. Quantity e
70 propellers/yaft 1 axis direction, that is, the same figure (
I3)'s / is shifted to Noj.

The offset; te is appropriately set according to each eigenvalue of the vibration frequency in the torsion direction and the bending direction to obtain the Quinaminok tamper effect.

According to the structure of this embodiment, as described above, the rubber elastic body 2
, the elastic center P2 in the torsional direction of 3 and the heavy node l of the weight 4
By offsetting weight 4 with weight 4
vibrates in a coupled vibration mode in the torsion direction and bending direction using the rubber elastic bodies 2 and 3 as springs, so the eigenvalue of the vibration frequency in the bending direction obtained from the Tynaminok tamper effect is as follows. This value can be lowered to reduce the vibration of the bending motor or improve bow performance.

In addition, the elastic center P2 of the rubber elastic bodies 2 and 30 and the weight 4
Even if we offset the center of gravity Pl of P, the eigenvalue of the vibration frequency in the torsional direction does not change at all compared to before the offset, so by reducing the eigenvalue in the bending direction as described above, - ), which requires a relatively higher eigenvalue in the torsion direction than the eigenvalue in the bending direction, particularly exhibits the effect of reducing vibration in the torsion direction.Therefore, as a result, both the torsion direction and the bending direction At the same time, a necessary and sufficient vibration reduction effect can be obtained.

In the embodiment shown in FIGS. 2(A) and 2(B), one column
, the spring constant of the elastic body 13 is set larger than the spring constant of the other rubber elastic body 12, and the small center 1 of the weight 4]
The +jiii center p2 of the rubber-based elastic body 1.2.13 is shifted to the right of the mill 3) in the same figure by an angle of 1.2.1.

In the embodiment shown in FIGS. 3(Δ) and 3(B), a hollow dummy portion 5 is formed at one end of the weight 14, thereby allowing the elastic bodies 2 and 3 to tighten. From the sexual center P2, the center of gravity of the weight 14 +)l is offset to the left in (13) in the same figure by a distance of 1)c.

Further, in the embodiment shown in FIGS. 4(A) and 4(B), the other elastic body 22 is provided in parallel with the ip elastic body 23, As a result, the elastic center P2 of the elastic body 22, 23 is offset to the left in FIG.

In the embodiments shown in FIGS. 2, 3, and 4, the same effects as in the first embodiment can be obtained.

Furthermore, in the embodiment shown in FIG. 5, a shaft portion 8 is integrally formed to protrude from the center of the joint yoke 7 toward the shaft body 6 side at the connection portion between the shaft body 6 and the joint yoke 7 forming the propeller shaft I. A sleeve-shaped weight 9 as a mass member was inserted into this shaft portion 8, and rubber elastic bodies 32 and 33 were interposed between the shaft portion 8 and the weight 9 and between the weight 9 and the shaft body 6. It is something.

In this embodiment, the widths of the rubber elastic bodies 32 and 33 are set to t4. At the same time, the elastic center P2 of the rubber elastic body 3233 and the center of gravity P1 of the weight 9 are made to be different from each other by shifting the positions of the rubber elastic bodies 32 and 33 with respect to the center of gravity 1]1 of the weight 9. The phase ξ: will be shifted to
As a result, the same effects as in each of the above embodiments can be obtained.

Effects of the Invention According to the present invention, the center of elasticity of the rubber elastic body and the center of gravity of the mass member are shifted from each other in the axial direction of the torque transmission tube, which causes an increase in weight. It is possible to simultaneously reduce vibrations in both the torsional direction and the bending direction using only one mass member without any problems.

[Brief explanation of drawings]

FIG. 1(A) is a sectional view of a main part showing the first embodiment of the present invention, FIG. 1(B) is an explanatory diagram modeling the same FIG. 1(A),
FIG. 2(A) is a sectional view of a main part showing a second embodiment of the present invention, FIG. 2(B) is an explanatory diagram of FIG. 2(A) as a model, and FIG. A sectional view of main parts showing a third embodiment of
Figure 3 (B) is an explanatory diagram that is a model of Figure 4 (A).
Figure (Δ) is a sectional view of a main part showing the fourth embodiment of the present invention, Figure 4 (B) is an explanatory diagram that is a model of Figure (A), and Figure 5 is a fifth embodiment of the present invention. A sectional view of main parts showing an example, Fig. 6 (A
) is a cross-sectional view of a main part of an example of a conventional Quinaminoktan bar, and FIG. 6(B) is an explanatory diagram that is a model version of FIG. 6(A).・Propeller shaft as a torque transmission tube, 2,
3.12 33-・Rubber-based elastic body, 13, 22°4, 5. 9 23, 32 Weight as mass member, P 1 1F center, P2 elastic center. Figure 1 (A) Figure (A) Figure (B) Figure (B) Figure (A) Figure (A) Figure (B) Figure (B)

Claims (1)

[Claims] (1) In a structure in which a mass member is provided concentrically with the torque transmission tube on the inner periphery of the torque transmission tube via a rubber elastic body, the elastic center of the rubber elastic body in the torsional direction and the center of gravity of the mass member are A dynamic damper characterized by torque transmission tubes that are offset from each other in the axial direction.