JP2004308825A - Vibration isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolation device capable of exercising high damping performance though it has a simple structure and lightweight. <P>SOLUTION: A compliance bush B mounted between a front edge of a trailing arm A of a suspension device and a car body is formed by connecting an outer collar 12 and an inner collar 13 to which the load is transmitted, by a rubber cushion, and a metallic ball 15 is press-fit inside a through hole 14d formed on the rubber cushion 14. When the rubber cushion 14 is deformed by the relative displacement of the outer collar 12 and the inner collar 13 by the load from a trailing arm A, the slipping is generated between the rubber cushion1 4 and the ball 15, and high damping performance can be exercised by the frictional force in accompany with the slipping. As this compliance bush B has a simple structure, it can be manufactured at a low cost, and further as it is compact and lightweight, a degree of freedom in its layout can be increased. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-vibration device in which a first member and a second member to which a load is transmitted are connected by an anti-vibration rubber.
[0002]
[Prior art]
In a liquid ring type vibration damping device used for an engine mount, a body mount, a differential mount, a bush for a suspension, etc., an outer cylinder and an inner cylinder are connected by a rubber elastic body, and a pressure receiving formed inside the rubber elastic body. The chamber and the equilibrium chamber communicate with each other via the orifice passage, and the incompressible fluid sealed in the pressure receiving chamber and the equilibrium chamber in response to the deformation of the rubber elastic body accompanying the vibration input passes through the orifice passage by a resonance action. A device that exerts a vibration-proof function against a vibration input is known from the following patent documents.
[0003]
[Patent Document]
Japanese Patent Application Laid-Open No. 2000-120762
[Problems to be solved by the invention]
Incidentally, the above conventional vibration isolator requires the formation of a pressure receiving chamber, an equilibrium chamber, an orifice passage, and the like inside the rubber elastic body, which not only complicates the structure and increases the manufacturing cost, but also increases the size and weight. And the degree of freedom of layout is impaired.
[0005]
The present invention has been made in view of the above circumstances, and has as its object to provide a vibration damping device that can exhibit high damping performance while having a simple structure, small size, and light weight.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, in a vibration isolator in which a first member and a second member to which a load is transmitted are connected by a vibration isolator, A vibration damping device characterized in that a friction member made of a material other than rubber is embedded in a non-adhered state, and slippage occurs between the vibration damping rubber and the friction member against the frictional force due to deformation of the vibration damping rubber due to a load. Is proposed.
[0007]
According to the above configuration, the friction member made of a material other than rubber is embedded in a non-adhered state inside the vibration isolating rubber connecting the first member and the second member. When the vibration isolating rubber is deformed by the displacement, slippage occurs between the vibration isolating rubber and the friction member, and a high damping performance can be exhibited by the frictional force associated with the sliding. In addition, since it has a simple structure in which a friction member is simply embedded in the vibration isolating rubber, it can be manufactured at low cost, and since it is small and lightweight, the degree of freedom in layout is enhanced.
[0008]
Further, according to the invention described in claim 2, in the vibration isolator in which the first member and the second member to which the load is transmitted are connected by the vibration isolating rubber, opposing friction is provided by providing a cut in the vibration isolating rubber. A vibration isolator characterized by forming a surface and causing slippage between the friction surfaces against frictional force by deformation of the vibration isolating rubber due to a load is proposed.
[0009]
According to the above configuration, the opposing friction surfaces are formed by providing cuts in the vibration isolating rubber connecting the first member and the second member, so that the vibration isolating is performed by the relative displacement of the first member and the second member due to the load. When the rubber is deformed, slippage occurs between the friction surfaces facing each other, and high damping performance can be exhibited by the frictional force associated with the slippage. In addition, since the vibration damping rubber has a simple structure in which only a cut is formed, no special member is required, and the vibration can be manufactured at a lower cost. In addition, since it is small and lightweight, the degree of freedom in layout is increased.
[0010]
The outer collar 12 of the embodiment corresponds to the first member of the present invention, the inner collar 13 of the embodiment corresponds to the second member of the present invention, and the balls 15, 17 and corrugated plate 16 of the embodiment correspond to the present invention. Corresponding to the friction member.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0012]
1 to 3 show a first embodiment of the present invention. FIG. 1 is a side view of a compliance bush, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is line 3-3 of FIG. It is sectional drawing.
[0013]
A compliance bush B, which elastically supports the tip of the trailing arm A of the suspension device on the vehicle body and allows the trailing arm A to move in the vehicle longitudinal direction, has a circular mounting formed at the tip of the trailing arm A. An outer collar 12 fixed to the hole 11 by press-fitting, an inner collar 13 having a bolt hole 13a through which a bolt passes and fixed to a mounting bracket on the vehicle body side, and an inner peripheral surface of the outer collar 12 and the inner collar 13. And a vibration-proof rubber 14 fixed between the outer peripheral surfaces by baking. When the outer collar 12 and the inner collar 13 are displaced relative to each other by applying a load in the front-rear direction indicated by arrows ab, the vibration isolating rubber 14 elastically deforms to absorb the impact.
[0014]
The anti-vibration rubber 14 includes a first space portion 14a, a second space portion 14b, and two third space portions 14c, 14c penetrating on both side surfaces thereof, and a load is input to the second space portion 14b. It is separated into two by a contact surface 14d orthogonal to the front-rear direction. Through holes 14e, 14e are formed at two positions above and below the axis L of the compliance bush B, and metal balls 15, 15 are formed in large-diameter portions 14f, 14f formed at the center of the through holes 14e, 14e. Press-fit. The balls 15, 15 are held by the large-diameter portions 14f, 14f by the elasticity of the vibration-proof rubber 14, and do not fall out of the through holes 14e, 14e.
[0015]
When a load in the front-rear direction is applied to the outer collar 11 of the compliance bush B from the trailing arm A as the vehicle travels, the vibration isolating rubber 14 is moved to the first space 14a, the second space 14b, and the third space. Due to the action of the portions 14c, 14c, the outer collar 12 and the inner collar 13 can be easily elastically deformed to enable relative displacement in the front-rear direction, and a shock transmitted from the wheels to the vehicle body via the trailing arm A can be buffered. . When a large input is made from the trailing arm A to the compliance bush B when the wheel rides on an obstacle, the contact surface 14d for separating the second space portion 14b of the vibration-proof rubber 14 into two parts comes into close contact. In addition, excessive deformation of the anti-vibration rubber 14 is suppressed.
[0016]
When the vibration isolating rubber 14 is deformed by the input of the load from the trailing arm A, the contact portions between the two balls 15, 15 embedded in the rubber isolating rubber 14 and the through-holes 14e, 14e slip and friction occurs. Since the force acts, the vibration of the vibration isolating rubber 14 can be effectively attenuated by the frictional force.
[0017]
As described above, according to this embodiment, it is possible to obtain effective damping performance with a simple structure in which the balls 15, 15 are simply pressed into the through holes 14e, 14e formed in the vibration isolating rubber 14 of the compliance bush B. In addition to being able to be manufactured at a lower cost than the conventional liquid-sealing type, the degree of freedom of layout is increased due to its small size and light weight.
[0018]
Next, a modification of the first embodiment will be described with reference to FIG.
[0019]
In the first embodiment, the balls 15, 15 are press-fitted into the through holes 14e, 14e formed in the anti-vibration rubber 14, but in the present modification, the through holes 14e, 14e are provided only on one side of the anti-vibration rubber 14. Are replaced with blind holes 14g, 14g that open to the side. According to this modification, the same operation and effect as those of the first embodiment can be achieved.
[0020]
Next, a second embodiment of the present invention will be described with reference to FIGS.
[0021]
In the second embodiment, two metal corrugated plates 16, 16 are employed in place of the two balls 15, 15 of the first embodiment. It is embedded in the upper and lower vibration isolating rubbers 14 in the front-back direction. The corrugated plates 16 and 16 are embedded when vulcanizing the anti-vibration rubber 14 with a mold, but the adhesive is not used at that time, so that the corrugated plates 16 and 16 and the anti-vibration rubber 14 are It is in sliding contact.
[0022]
Therefore, when the vibration isolating rubber 14 is deformed by the input of the load from the trailing arm A, the contact portions between the two corrugated plates 16, 16 embedded in the rubber isolating rubber 14 and the vibration isolating rubber 14 slide, and the frictional force is increased. , The vibration of the vibration isolating rubber 14 can be effectively attenuated by the frictional force. According to the second embodiment, the same operation and effect as those of the first embodiment can be achieved.
[0023]
Next, a modification of the second embodiment will be described with reference to FIG.
[0024]
In the second embodiment, the corrugated plates 16 and 16 are embedded in the anti-vibration rubber 14, but in this modification, the balls 17 and 17 are embedded in the anti-vibration rubber 14 instead of the corrugated plates 16 and 16, and When the rubber 14 is deformed, a frictional force due to sliding is generated at a contact portion with the balls 17, 17. According to this modification, the same operation and effect as those of the second embodiment can be achieved.
[0025]
Next, a third embodiment of the present invention will be described with reference to FIG.
[0026]
In the third embodiment, a "U" -shaped cut 14h is formed in the vibration isolating rubber 14 above (or below or both above and below the axis L), and two cuts 14h are contacted with each other. Friction surfaces 14i, 14i are formed.
[0027]
Therefore, when the vibration isolating rubber 14 is deformed by the input of the load from the trailing arm A, the friction surfaces 14i, 14i of the cuts 14h of the vibration isolating rubber 14 slide and apply a frictional force. 14 can be effectively attenuated. According to the third embodiment, the same operation and effect as those of the first embodiment can be achieved. Further, since there is no need to embed other members, the number of parts is further reduced, and the cost is further reduced.
[0028]
The embodiments of the present invention have been described above. However, various design changes can be made in the present invention without departing from the gist thereof.
[0029]
For example, in the embodiment, the compliance bush B for suspension is illustrated, but the present invention is applicable to any use such as an engine mount, a body mount, and a differential mount.
[0030]
Further, the friction member of the present invention is not limited to the balls 15, 17 and the corrugated plate 16, and its shape, material, mounting position, number, and the like can be appropriately changed.
[0031]
Also, the shape, formation position, number, and the like of the cuts 14h can be appropriately changed.
[0032]
The first and second members of the present invention need not be annular members arranged concentrically, but may be plate-like members arranged so as to face each other.
[0033]
【The invention's effect】
As described above, according to the first aspect of the invention, since the friction member made of a material other than rubber is embedded in a non-adhered state inside the vibration isolating rubber connecting the first member and the second member, the load is reduced. When the anti-vibration rubber is deformed due to the relative displacement of the first member and the second member, slippage occurs between the anti-vibration rubber and the friction member, and high damping performance can be exhibited by the frictional force associated with the slip. In addition, since it has a simple structure in which a friction member is simply embedded in the vibration isolating rubber, it can be manufactured at low cost, and since it is small and lightweight, the degree of freedom in layout is enhanced.
[0034]
According to the second aspect of the present invention, the opposing friction surfaces are formed by providing cuts in the vibration isolating rubber connecting the first member and the second member. When the vibration isolating rubber is deformed by the relative displacement of the members, slippage occurs between the friction surfaces facing each other, and high damping performance can be exhibited by the frictional force associated with the slippage. In addition, since the vibration damping rubber has a simple structure in which only a cut is formed, no special member is required, and the vibration can be manufactured at a lower cost. In addition, since it is small and lightweight, the degree of freedom in layout is increased.
[Brief description of the drawings]
FIG. 1 is a side view of a compliance bush according to a first embodiment. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. FIG. 5 is a view corresponding to FIG. 3 according to a modified example. FIG. 5 is a side view of a compliance bush according to a second embodiment. FIG. 6 is a cross-sectional view taken along the line 6-6 in FIG. FIG. 8 corresponding to FIG. 6 according to an example FIG. 8 corresponding to FIG. 3 according to a third embodiment
12 outer collar (first member)
13 Inner collar (second member)
14 Vibration-proof rubber 14h Cut 14i Friction surface 15 Ball (friction member)
16 Corrugated sheet (friction member)
17 Ball (friction member)

Claims (2)

In a vibration isolator in which a first member (12) and a second member (13) to which a load is transmitted are connected by a vibration isolating rubber (14),
Friction members (15, 16, 17) made of a material other than rubber are embedded in the anti-vibration rubber (14) in a non-adhered state, and the anti-friction force is prevented by deformation of the anti-vibration rubber (14) due to a load. An anti-vibration device characterized by generating a slip between the vibration rubber (14) and the friction members (15, 16, 17). In a vibration isolator in which a first member (12) and a second member (13) to which a load is transmitted are connected by a vibration isolating rubber (14),
Opposing friction surfaces (14i) are formed by providing cuts (14h) in the vibration isolating rubber (14), and the friction surfaces (14i) are opposed to frictional force by deformation of the vibration isolating rubber (14) due to a load. (1) An anti-vibration device characterized in that slippage occurs between them.

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