JP2002098187A - Link - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give a damping property corresponding to a wide range of frequency to a link. SOLUTION: A sticky elastic body 6 is inserted in a hollow portion forming a pipe-shaped longitudinal portion 1, and further, a core member 7 having an I-shape in section is inserted to the inside of the inserted sticky elastic body, and then the sticky elastic body 6 is pressed against the inner wall surface of the longitudinal portion 1 by means of a pushing portion 9 of the core member so as to come into contact with each other in a sandwiched state. The sticky elastic body 6 is approximately 3 mm or less in thickness and is slip- deformed to the bending of both the longitudinal portion 1 and core member 7 that hold the sticky elastic body between its outside and inside respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a link used for a suspension or the like, and more particularly to a link having excellent vibration damping action.

[0002]

2. Description of the Related Art As a link having a damping action, for example,
2. Description of the Related Art There is a known structure in which a longitudinal portion is hollow and a dynamic damper is inserted therein to obtain a vibration damping effect (see JP-A-11-166584).

[0003]

When the above-mentioned dynamic damper is used, a vibration damping effect can be obtained for a specific frequency coinciding with the resonance frequency set for the dynamic damper, but a wider frequency range outside the resonance frequency can be obtained. No vibration damping effect can be produced. Therefore, an object of the present invention is to provide a link having a vibration damping effect over a wider range of frequencies than can be expected with the dynamic damper.

[0004]

According to a first aspect of the present invention, a viscoelastic body having a thickness of 3 mm or less is inserted inside a longitudinal portion, and a core member is further inserted inside the viscoelastic body. And the viscoelastic body is sandwiched and fixed between the longitudinal portion and the viscoelastic body.

A second aspect of the present invention is characterized in that a longitudinal portion of an aluminum pipe having two inner and outer layers is provided, and a viscoelastic material is filled between the inner and outer layers.

[0006]

According to the first aspect of the invention, the viscoelastic body having a thickness of 3 mm or less is sandwiched between the longitudinal portion and the core member. The shear deformation of the viscoelastic body causes a large loss coefficient, thereby effectively damping vibration having a wide range of frequencies.

According to the second aspect, since the viscoelastic material is filled between the inner and outer layers of the aluminum pipe forming the inner and outer layers, the viscoelastic material is sheared and deformed by the vibration between the inner and outer layers, so that the vibration has a wide frequency range. Damping against it. In addition, since the aluminum pipes forming the inner and outer layers can be easily formed by extrusion and can be easily filled with the viscoelastic body, a link having a vibration damping effect can be easily formed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 relate to the first embodiment, FIG. 1 is a view showing a cross-section of a part of a suspension link, and FIG.
FIG. 2 is a sectional view taken along line 2-2 of FIG.

This link has a rectangular pipe-shaped longitudinal portion 1 and bush attaching portions 2 attached to both ends thereof. The bush attaching portion 2 is a ring portion 4 into which a cylindrical bush 3 is fitted.
And a fitting projection 5 protruding outward from a part of the fitting projection 5. An end of the longitudinal portion 1 is fitted into a hole formed in the fitting projection 5 and connected and integrated by appropriate means such as welding. Is done. Long section 1
The bush mounting portion 2 is formed by an appropriate material such as an extruded product such as aluminum or iron or the like by another appropriate method.

Inside the longitudinal section 1, a viscoelastic body 6 and a core member 7 are inserted in the entire longitudinal direction. As is clear from FIG. 2, the viscoelastic body 6 has a thin plate shape made of a material having a high vibration damping action, such as rubber or an elastomer, and the thickness thereof depends on the material of the viscoelastic body 6. It is different but about 3 mm or less as a whole, preferably about 0.5 mm to 1 mm for rubber and 0.01 mm to
0.1 mm. This thickness is necessary to attenuate vibration by shear deformation.

The core member 7 is a member made of the same material as that of the longitudinal portion 1. In the present embodiment, the core member 7 has an I-shaped cross section, a central portion having leg portions 8 extending vertically, and upper and lower end portions each having a central portion. The pressing portion 9 has a planar shape in a direction perpendicular to the portion and faces in parallel with the inner wall surface of the longitudinal portion 1. However, the cross-sectional shape can be variously described later and other shapes.

The viscoelastic body 6 and the core member 7 are inserted into the longitudinal portion 1.
In order to insert the viscoelastic body 6, the viscoelastic body 6 is adhered to the surface of the pressing portion 9 of the core member 7 in advance, and is pressed into the longitudinal portion 1 in this state. Thereby, the viscoelastic body 6 and the core member 7 can be easily and simultaneously inserted. However, the elastic body 6 and the core member 7 can be optionally inserted separately.

In this manner, the viscoelastic body 6 is connected to the longitudinal portion 1.
Since it is sandwiched between the inner wall and the core member 7 in a sandwich shape, shear deformation follows the bending of the longitudinal portion 1. That is, when an external force in the pulling or compressing direction is applied to the bush mounting portions 2 provided at both ends of the longitudinal portion 1, bending deformation occurs in the longitudinal portion 1, and the core member 7 also follows and deforms.

Then, the intermediate viscoelastic body 6 is sheared by the deformation of the longitudinal portion 1 and the core member 7 to form a large loss coefficient, and the vibration is attenuated and damped by the loss coefficient.
It should be noted that the shear deformation of the viscoelastic body 6 corresponds to the bending deformation of the longitudinal portion 1 and is not related to a specific frequency, so that vibration of a wide range of frequencies can be damped by the shear deformation.

FIG. 3 is a graph showing this effect, in which the horizontal axis represents the frequency and the vertical axis represents the gain of the damping effect. The broken line is a comparative example, which has a meaning as a base lacking the viscoelastic body and the core member in the present invention, and the solid line is the present invention. As is clear from this graph, according to the present embodiment, an excellent vibration suppression effect can be obtained in a wide frequency range.

Moreover, if the viscoelastic body 6 is about 3 mm or less, when vibration is input to one end of the longitudinal portion 1, the vibration is effectively generated between the outer longitudinal member and the inner core member due to shear deformation. Expected to decay. In addition, this thickness allows insertion into the longitudinal part 1. Therefore, it is advantageous for both improving the vibration damping effect and improving the mounting property in the longitudinal portion 1.

FIGS. 4 and 5 show a second embodiment. FIG. 4 shows a cross section (a cross section perpendicular to the axis, hereinafter the same) of the longitudinal portion 1 and a viscoelastic body 16 having a ring-shaped cross section inside thereof. , The viscoelastic body 16 and the core member 17 are provided to have substantially the same length as the longitudinal portion 1, and form a sandwich structure between the viscoelastic body 16 and the inner wall of the longitudinal portion 1. are doing. The material and thickness of the viscoelastic body 16 are the same as in the first embodiment, and a similar vibration damping effect can be obtained.

FIG. 5 shows a manufacturing method for forming this link. The core member 17 and the viscoelastic body 16 are previously formed to have a small diameter, and the small diameter viscoelastic body 16 is formed on the outer periphery of the small diameter core member 17a.
are integrated in advance to form a small-diameter integrated pipe 20a. The small-diameter integrated pipe 20a has an outer diameter D4 smaller than the inner diameter D1 of the longitudinal section 1 and is easily inserted into the longitudinal section 1.

A large-diameter member 21 for expanding the small-diameter pipe 20a to form a pipe 20 composed of the viscoelastic body 16 and the core member 17 having a final thickness has a tip 22 of the small-diameter pipe 20.
The outer diameter D3 is smaller than the inner diameter of a, and changes to the maximum diameter portion 24 via the slope portion 23 following the tip 22.

The outer diameter D2 of the maximum diameter portion 24 is the same as the inner diameter of the expanded pipe 20 (ie, the inner diameter of the core member 17), and this diameter presses the viscoelastic body 16 against the longitudinal portion 1 with a predetermined force. It can be done.

Therefore, when the diameter-enlarged member 21 is pressed into the longitudinal portion 1, the outer diameter D is smaller than the inner diameter of the small-diameter pipe 20a.
3 is easily inserted into the inside of the small-diameter pipe 20a.
Thereby, the small-diameter pipe 20a is expanded so as to be larger than the inner diameter D1 of the longitudinal portion 1.

However, since the viscoelastic body 16 is compressed by the inner wall of the longitudinal portion 1, its outer diameter is D1. As a result, the viscoelastic body 16 has a sandwich structure in which the core member 17 reliably presses the viscoelastic body 16 toward the longitudinal portion 1. In this way, the longitudinal portion 1 having a sandwich structure composed of the core member 17 and the viscoelastic body 16 can be easily formed.

FIGS. 6 and 7 show a third embodiment. In this embodiment, the viscoelastic body 6 is pressed against the inner wall of the longitudinal section 1 after the integrated structure 50 of the viscoelastic body 6 and the core member 47 is inserted by partially deforming the first embodiment.

The core member 47 has a T-shaped cross section corresponding to the leg 8 of the first embodiment divided at an intermediate portion in the vertical direction, and is provided as a pair of upper and lower members. Accordingly, as shown in FIG. 6, the legs 48, 48 of the upper and lower core members 47, 47 are provided.
By making the dimension d1 between the end portions 51, 51 smaller than the final interval d2 (FIG. 7), the end portion 51 can be easily inserted into the longitudinal portion 1.

Thereafter, the expanding member 52 is pushed between the two end portions 51. The expansion member 52 is a rail-shaped member having an H-shaped cross section as shown in FIG. 7 and can fit the end portion 51 into the upper and lower grooves 53, and the distance d2 between the bottoms of the upper and lower grooves 53 is larger than d1. Keep it large.

Thus, when the expansion member 52 is pushed in, the upper and lower core members 47 are separated from each other in the up and down direction and pressed against the inner surface of the longitudinal portion 1, so that the viscoelastic body 6 is moved.
To give a predetermined pressing force. According to this method, enlargement of the core member 47 is easy and reliable.

FIG. 8 shows a fourth embodiment. In this embodiment, a pair of upper and lower pressing portions 6 which are formed in a semi-cylindrical shape and overlap face to face.
9 and 69 and a leg 68 connecting the respective central portions thereof. The upper and lower pressing portions 69 and 69 as a whole have an inner diameter of the longitudinal portion 1 so as to be inserted into the interior of the longitudinal portion 1. It has a substantially cylindrical shape with a smaller diameter. The leg 68 is bent in a substantially S-shape and has a spring property. For this reason, the pressing portions 69, 6
When inserting the core member 67 in which the viscoelastic body 66 is integrated with the inner part 9 into the inside of the longitudinal portion 1, the leg member 68 can be easily inserted while being elastically deformed.

After insertion, the viscoelastic body 66 can be constantly pressed against the longitudinal portion 1 with a constant pressing force due to the spring property of the leg portion 68. Therefore, even if the viscoelastic body 66 is deformed due to fatigue due to aging, a constant pressing force can be maintained for a long time, and the vibration damping performance can be stabilized for a long time.

FIG. 9 shows a fifth embodiment. In this embodiment, the core member 77 has a substantially rectangular cylindrical shape, and the upper and lower sides are the pressing portions 7.
9 and 79, and the right and left sides connecting these are leg portions 78,
As well as the legs 78, the legs 78, 78 are bent inward so that their intermediate portions in the vertical direction approach each other, and have a spring property.
For this reason, this embodiment has the same effect as the previous embodiment, and also has the viscoelastic body 76 when the longitudinal portion 1 is a square pipe.
Can be kept constant.

FIG. 10 et seq. Show an example in which the longitudinal portion has an inner and outer two-layer pipe structure. FIG. 10 shows a sixth embodiment, in which a circular outer pipe 80 and an inner pipe 8 are formed by aluminum extrusion.
1 are formed concentrically in cross section at predetermined intervals, and are connected at predetermined intervals in the circumferential direction by connecting portions 82. A circular groove 8 having a dimension S between the outer pipe 80 and the inner pipe 81
3 is formed. The dimension S of the circular groove 83 is 0.01
It is set to about 0.1 mm to 0.1 mm.

The circular groove 83 is filled with a viscoelastic body 84 of a suitable resin material, and in the case of a resin material such as an elastomer, is cured by a predetermined method and integrated. The dimension S takes into account the manufacturing method of filling and curing the resin as described above. In this way, the formation of the inner pipe 81 and the viscoelastic body 84 becomes extremely simple. In this example, when the longitudinal portion 80 bends in the left-right direction in the figure, the viscoelastic body 84
Shearing deformation becomes possible. However, if one of the upper and lower connecting portions 82 is omitted, shear deformation becomes possible even when the connecting portion 82 is bent in the vertical direction in the drawing.

FIG. 11 shows a seventh embodiment formed by the same method. In this embodiment, the outer pipe 80 and the inner pipe 81, which are the longitudinal portions, are integrally formed into a square pipe, and the outer pipe 80 and the inner pipe 81 are formed. A viscoelastic body 84 made of a resin material is filled in a circular groove 83 formed between the grooves. The bottom side of the inner pipe 81 has a substantially T-shaped section 85 projecting toward the center, and a rib 86 connected to the outer pipe 80 is integrally formed at the center thereof.

By doing so, the ribs 86 are formed only on one side (the lower side in the figure) of the outer pipe 80 and the inner pipe 81. Similar and favorable shear deformation is enabled not only in the vertical direction but also in the horizontal direction in the drawing, and eventually, the shear deformation can be generated in the vertical and horizontal directions.

FIG. 12 shows an eighth embodiment in which the outer pipe 80 and the inner pipe 81, which are longitudinal portions, are extruded as separate pipes, and ribs are provided around the inner pipe 81 at predetermined intervals, for example, at 90 ° intervals. 87 is formed long in the axial direction. Filling the circular groove 83 formed between the outer pipe 80 and the inner pipe 81 with the viscoelastic body 84 in a state where the inner pipe 81 is inserted into the outer pipe 80 and kept coaxial therewith provides a vibration damping effect. The link with is obtained.

In addition, such a two-layered inner / outer pipe can be easily formed by aluminum extrusion and can be easily filled with a viscoelastic body 84 made of a resin material. Therefore, the viscoelastic body 84 is provided in a sandwich shape. The longitudinal portion can be easily formed. In addition, since the ribs 87 are provided at regular intervals in the circumferential direction, it is possible to prevent the viscoelastic body 84 from being biased during filling.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of a suspension link.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a graph showing the effect of the present embodiment.

FIG. 4 is a sectional view perpendicular to the axis of the second embodiment.

FIG. 5 is a diagram showing a manufacturing method according to a second embodiment.

FIG. 6 is a view showing a manufacturing method according to a third embodiment.

FIG. 7 is a sectional view perpendicular to the axis of the third embodiment.

FIG. 8 is a sectional view perpendicular to the axis according to a fourth embodiment.

FIG. 9 is a cross-sectional view orthogonal to an axis according to a fifth embodiment.

FIG. 10 is an axial cross-sectional view according to a sixth embodiment.

FIG. 11 is an axial cross-sectional view according to a seventh embodiment.

FIG. 12 is a sectional view perpendicular to the axis according to an eighth embodiment.

[Explanation of symbols]

1: Longitudinal portion, 2: Bush mounting portion, 6.16, 36: Viscoelastic body, 7, 17, 37, 47, 67: Core member, 8.6
8.78: leg, 80: outer pipe, 81: inner pipe, 82: connecting part, 83: circular groove, 84: viscoelastic body

Claims (4)

[Claims] 1. A link having a longitudinal portion and a bush mounting portion to which external force is applied to both ends thereof, wherein the longitudinal portion is hollow, and a viscoelastic body having a thickness of 3 mm or less is inserted into the hollow portion. A link, wherein a core member is inserted into the inside thereof and a viscoelastic body is sandwiched between the core member and the longitudinal portion to be fixed. 2. The link according to claim 1, wherein a pressing force is applied to the viscoelastic body by deforming the core member after insertion. 3. The link according to claim 1, wherein a bent leg is provided on the core member, and the pressing force against the viscoelastic body is kept constant by restoring elasticity of the leg. 4. A link characterized in that the longitudinal portion is an inner / outer two-layer pipe which is integrally and separately extruded and formed, and a viscoelastic material is filled between the inner and outer layers.