JPH0942367A - Antirattler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce rigidity of an axial direction while suppressing a work cost by forming a partition member of an elastic material. SOLUTION: The rim part of a separating member 20 for separating a liquid chamber 36 is formed so as to thin the thickness toward a top end, the top end of the separating member 20 abuts on a restrict passage forming member 34 by compressing it beforehand, and thereby, liquid leakage is prevented between liquid chambers 36A, 36B. When an inner cylinder 18 is displaced in an axial right direction relatively in an outer cylinder 12, the axial right rigidity of the separating member 20 suppressed to a small level, and also the axial right rigidity as an antirattler is also suppressed. Liquid leakage is not generated even if a ring and the like for preventing liquid leakage are not vulcanizing- stuck on the outer peripheral side of the separating member 20 independently, and improvement of rigidity of the axial right direction generated by vulcanizing-sticking the ring and the like on the outer peripheral side of the separating member 20 is not generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for absorbing vibrations from a vibration generating portion, and is used, for example, in engine mounts for preventing transmission of engine vibrations to a vehicle body, other vehicles and general industrial machines. It is applicable.

[0002]

2. Description of the Related Art For example, a vibration isolator as an engine mount is arranged between an engine which is a vibration generator and a vehicle body which is a vibration receiver, and the vibration isolator absorbs vibration generated by the engine. However, the structure is such that it is prevented from being transmitted to the vehicle body side.

That is, as an example of such a vibration isolation device, a vibration isolation device 100 as shown in FIG. 4 is known.
The conventional technique will be described with reference to this drawing.

As shown in FIG. 4, a conventional vibration isolation device 100 is provided.
The inner cylinder 114 is attached to the inside of the outer cylinder 110 and the intermediate cylinder 116A fitted to the outer cylinder 110 via the elastic body 112, and the intermediate cylinder fitted to the outer cylinder 110 is located below the elastic body 112. A diaphragm 124 is provided so as to connect the cylinder 116B and the inner cylinder 114. Further, on the inner peripheral surface of the outer cylinder 110 between the elastic body 112 and the diaphragm 124, the limiting passage forming member 1 made of synthetic resin for forming a limiting passage.
22 is provided, the elastic body 112, the diaphragm 1
A chamber is formed by 24, the inner cylinder 114, and the restricted passage forming member 122, and a liquid chamber 126 is formed by filling the chamber with liquid. An annular partition member 118 for partitioning the liquid chamber 126 is provided on the outer circumference of the inner cylinder forming the liquid chamber 126 so as to project outward in the direction perpendicular to the axis. Is vulcanized and bonded.

The restricted passage forming member 122 is provided with two annular projections 122A which project inward in the direction perpendicular to the axis, and the partition member 118 is fitted between these projections 122A. In addition, the ring 120 is in contact with the inner circumference of the restricted passage forming member 122 to divide the liquid chamber 126 into a pair of a main liquid chamber 126A and a sub liquid chamber 126B to partition the liquid chamber 126. Then, in the limiting passage 122B formed by the limiting passage forming member 122, these liquid chambers 126A, 1A
26B has a structure in which they communicate with each other. When the mounted engine operates to generate vibration, the damping function of the elastic body 112 and the viscous resistance of the liquid in the restriction passage 122B communicating the liquid chambers 126A and 126B, the liquid column resonance, and the like are used to reduce the damping force. Is generated to absorb the vibration and block the transmission of the vibration.

[0006]

By the way, in this conventional vibration damping device, the restricted passage forming member 122 and the partition member 1 are provided.
In order to prevent the liquid from leaking from between the partition 18 and the partition 18, a metal liquid leakage prevention ring 120 is provided on the outer periphery of the partition member 118.
Is provided by vulcanization adhesion, and this ring 120 is brought into contact with the inner circumference of the restricted passage forming member 122. However, although the liquid leakage between the liquid chambers can be measured by this, since the metal ring 120 is vulcanized and adhered to the partition member 118, the inner cylinder 114 is relatively inside the outer cylinder 116 in the direction perpendicular to the axis. When displaced, the partition member 118 is compressed by the ring 120, and the rigidity in the direction perpendicular to the axis is increased. For this reason, there is also a drawback that the number of parts constituting the vibration isolator increases and the manufacturing cost increases.

In view of the above facts, it is an object of the present invention to provide a vibration isolator in which the partition member is formed of only an elastic material to reduce the processing cost and reduce the rigidity in the direction perpendicular to the axis.

[0008]

The present invention has the following constitution in order to achieve such an object. That is, the vibration isolator of the invention according to claim 1 has an outer cylinder connected to one of the vibration generating portion and the vibration receiving portion, and a position connected to the other of the vibration generating portion and the vibration receiving portion and located inside the outer cylinder. An inner cylinder, an elastic body disposed between the inner cylinder and the outer cylinder so as to connect the inner cylinder side and the outer cylinder side, and at least a part of the partition wall surface is formed by the elastic body. A liquid chamber that is configured and that is filled with liquid and that is formed between the inner cylinder and the outer cylinder, a partition member that divides the liquid chamber in the axial direction, and the divided liquid chambers communicate with each other. And a cylindrical limiting passage forming member that is disposed along the inner peripheral surface of the inner cylinder or the outer cylinder and that forms a part of the partition surface of the liquid chamber. And a vibration damping device comprising an elastically deformable diaphragm, wherein the partition member is annular. One of the inner edge portion and the outer edge portion of the partition member is fixed to one of the inner tube and the outer tube, and the other is configured to come into contact with the limiting passage forming member in advance, and the inner edge portion and the outer edge portion of the partition member. The other edge is formed so as to become thinner toward the tip.

[0009]

According to the operation of the vibration isolator according to claim 1, when the vibration is transmitted from the vibration generating portion side to the outer cylinder or the inner cylinder, the elastic body made of the elastic material is deformed, and the liquid is accompanied by the deformation. Flows between the liquid chambers through the restriction passage. As a result, the internal friction of the elastic body absorbs the vibration, and the flow resistance of the liquid when the liquid flows through the restriction passage or the liquid column resonance of the liquid absorbs the vibration, and the vibration is damped. Vibration is less likely to be transmitted to the vibration receiving portion connected to the cylinder.

Further, the edge portion of the partition member that abuts against the limiting passage forming member is formed so that the thickness thereof becomes thinner toward the tip, and the leading end is compressed in advance to come into contact with the limiting passage forming member. As a result, the sealing performance between the liquid chambers is maintained, and when the inner cylinder is relatively displaced in the outer cylinder in the direction perpendicular to the axis, the rigidity of the partition member at right angles to the axis is small, and the rigidity at right angles to the axis as a vibration isolator is low. Can be kept small. Therefore, liquid leakage does not occur even if a ring for preventing liquid leakage is not separately provided on the outer periphery of the partition member, and the rigidity in the direction perpendicular to the axis, which is caused by providing the ring or the like on the outer periphery of the partition member, does not occur.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of a vibration isolator according to the present invention is shown in FIG. 1, and a detailed description will be added based on this. As shown in FIG. 1, the vibration isolator 10 according to the present embodiment is press-fitted and connected to a cross member (not shown) which is a constituent member of an automobile, and an outer cylinder 12 formed in a cylindrical shape. Is provided. A locking portion 12A is provided at the lower end of the outer cylinder 12 and is bent inward over the entire circumference. Below the locking portion 12A, the locking portion 12A is applied over the entire circumference of the locking portion 12A. A rubber-made stopper 14 which is adhesively bonded to sulfur is fixed.

On the inner peripheral side of the outer cylinder 12, there is fitted a cylindrical portion of an intermediate cylinder 16A which is formed in a cylindrical shape and whose upper end portion is bent to form a flange shape. A ring-shaped intermediate cylinder 16B at a position separated from the cylinder 16A.
Are fitted. Further, an inner cylinder 18 which is formed in a cylindrical shape and is connected to the vehicle body side of the automobile is arranged in a position coaxial with the outer cylinder 12 in the outer cylinder 12.

Further, between the intermediate cylinder 16 and the inner cylinder 18,
The rubber elastic body 24 made of an elastic material is used for the intermediate cylinder 16 and the inner cylinder 18.
Are vulcanized and bonded to each other. A hole 26 is provided at a part of the elastic body 24. Therefore, the inner cylinder 1 with respect to the outer cylinder 12 is formed by the hole 26.
A large displacement in the direction of the hole of 8 is possible.

On the lower side of the elastic body 24 in FIG.
A diaphragm 30 made of a rubber film is provided by vulcanization adhesion so as to connect 6B and the inner cylinder 18. The diaphragm 30 is elastically deformable, and is capable of expanding and contracting a liquid chamber described later. Further, on the inner peripheral surface of the outer cylinder 12 between the elastic body 24 and the diaphragm 30, a restriction passage forming member 34 made of synthetic resin for forming a restriction passage is arranged. The outer periphery of the restricted passage forming member 34 is in close contact with the inner peripheral surface of the outer cylinder 12. A groove is formed on the outer periphery of the restricted passage forming member 34, and when the restricted passage forming member 34 contacts the inner peripheral surface of the outer cylinder 12, this groove becomes the restricted passage 34B. Further, the restricted passage forming member 34 is provided with two annular protrusions 34A protruding inward in the direction perpendicular to the axis. Here, the elastic body 24,
Diaphragm 30, inner cylinder 18, and restricted passage forming member 34
Thus, a sealed space is formed, and the liquid chamber 36 is formed by filling the space with a liquid such as water, silicone oil, or ethylene glycol.

An annular partition member 20 for partitioning the liquid chamber 36 in the axial direction is disposed inside the liquid chamber 36. The partition member 20 is formed of a rubber plate made of an elastic material, and its inner edge portion is fixed to the outer peripheral surface of the inner cylinder 18 by vulcanization adhesion. In the present embodiment, a film-like extending portion is provided from the lower end of the elastic body 24 so as to cover the inner peripheral surface of the inner cylinder 18, and the elastic body 24 is provided with the diaphragm by the extending portion. 30 and partition member 20
That is, the elastic body 24, the diaphragm 30, and the partition member 20 are integrally molded.

Further, the outer edge of the partition member 20 is formed so that the thickness thereof decreases toward the tip and the cross-sectional shape becomes a substantially right triangle, and the apex thereof is previously compressed on the inner peripheral surface of the restricted passage forming member 34. Abutting. That is, the restricted passage forming member 34 is provided with two protruding portions 34A protruding inward in the direction perpendicular to the axis as described above, and the partition member 20 is provided between these protruding portions 34A. Fits and comes into contact with the protrusion 34A by being compressed in advance,
The liquid chamber 36 is divided into a pair of main liquid chamber 36A and a sub liquid chamber 36B to be partitioned. The main liquid chamber 36A and the sub liquid chamber 36B are communicated with each other by a restriction passage 34B. That is, one end of the restriction passage 34B is communicated with the main liquid chamber 36A by a through hole (not shown) formed in the restriction passage forming member 34, and the other end of the restriction passage 34B is formed in the restriction passage forming member 34. The through hole (not shown) communicates with the sub liquid chamber 36B.
The liquid can flow between the main liquid chamber 36A and the sub liquid chamber 36B via the.

Next, the assembly of the vibration isolator 10 of this embodiment will be described. In assembling the vibration isolator 10, first, the intermediate cylinders 16A and 16B and the inner cylinder 1 are attached to a mold (not shown).
8 is arranged and an elastic material is injected, and the elastic body 24, the diaphragm 30, and the partition member 20 are integrated and the intermediate cylinder 16
Vulcanization molding is performed so that the A and 16B and the inner cylinder 18 are integrally bonded. After that, the restricted passage forming member 34 formed of a pair of arc-shaped members is attached to the intermediate cylinders 16A and 16B so as to sandwich the inner cylinder 18, and is formed into a cylindrical shape. At that time, the partition member 2 is provided between the two protrusions 34A.
0 is fitted and the partition member 20 is attached so as to come into compression contact with the inner peripheral surface.

In order to fill the liquid chamber 36 with the liquid, the inner diameter of the liquid chamber 36 is made large beforehand and the stopper 1
4 to the outer cylinder 12 vulcanized and bonded to the intermediate cylinders 16A, 16B,
The elastic body 24 and the restricted passage forming member 34 are integrally inserted. Next, the outer cylinder 12 is caulked by press working so as to reduce the outer diameter of the outer cylinder 12, and the intermediate cylinders 16A and 16B, the restricted passage forming member 34, and the outer cylinder 12 are securely fixed to each other. 1
An anti-vibration device as shown in is obtained.

Next, the operation of the vibration isolator 10 of this embodiment will be described. When engine vibration or road vibration is transmitted to the outer cylinder 12 via the cross member, the elastic body 24 is deformed and its deformation is caused. The liquid is the main liquid chamber 36A and the sub liquid chamber 3
Flow between 6B. As a result, the vibration is absorbed by the resistance due to the internal friction of the elastic body 24, and the flow resistance in the restriction passage 34B or the restriction passage 34B when the liquid flows between the main liquid chamber 36A and the sub liquid chamber 36B. Due to the liquid column resonance of the liquid, the vibration is absorbed and attenuated, and it becomes difficult to transmit the vibration to the vehicle body side connected to the inner cylinder 18.

The outer edge of the partition member 20 for partitioning the liquid chamber 36 is formed so that the thickness thereof decreases toward the tip, and the tip is compressed in advance and brought into contact with the restricted passage forming member 34. Therefore, the precompression of the tip of the partition member 20 maintains the sealing property between the liquid chambers 36A and 36B, and when the inner cylinder 18 is relatively displaced in the outer cylinder 12 in the direction perpendicular to the axis, the thickness is By compressing in a thin portion, the rigidity of the partition member 20 at right angles to the axis is small, and the rigidity at right angles to the axis of the vibration isolator 10 can be suppressed to be small. As described above, in the vibration isolator 10 according to the present embodiment, the ring for preventing the liquid leakage of the liquid from the main liquid chamber 36A and the sub liquid chamber 36B is separately provided in the partition portion while maintaining the sufficient vibration damping characteristics. Since it is not provided on the outer circumference, the increase in rigidity in the direction perpendicular to the axis that would occur when the ring is provided on the outer circumference of the partition by vulcanization adhesion or the like does not occur. Furthermore, since a ring for preventing liquid leakage is not required, the number of parts can be reduced, the manufacturing process can be simplified, and the manufacturing cost can be reduced.

Next, a second embodiment of the vibration isolator according to the present invention is shown in FIG. 2, and a description will be added based on this. FIG.
The description of the constituent members equivalent to the constituent members of the above is omitted. As shown in FIG. 2, the outer edge portion of the partition member 20 is formed to have a cross-sectional shape of an approximately isosceles triangle so that the thickness thereof decreases toward the tip, and the apex of the restricted passage forming member 34 is formed. It is precompressed and abuts against a part of the inner peripheral surface. Therefore, this embodiment also has the same operation and effect as the first embodiment.

Next, a third embodiment of the vibration isolator according to the present invention is shown in FIG. 3, and a description will be added based on this. FIG.
The description of the constituent members equivalent to the constituent members of the above is omitted. As shown in FIG. 3, the outer peripheral portion, which is the outer edge of the partition member 20, is formed to have V-grooves so as to have two apexes so that the thickness becomes thinner toward the tip, and each apex is restricted. The passage forming member 34 is preliminarily compressed and abutted on a part of the inner peripheral surface of the passage forming member 34. Therefore, this embodiment also has the same effect as the first embodiment.

In the above example, the restricted passage forming member 3
4 is arranged along the inner peripheral side of the outer cylinder, and the partition member 20 extended from the inner cylinder 18 is brought into contact therewith, but the restricted passage forming member 34 is arranged along the outer peripheral side of the inner cylinder. You may
In this case, the outer edge of the partition member 20 is fixed to the inner peripheral side of the outer cylinder, and the tip of the inner edge contacts the outer periphery of the restricted passage forming member 34. Then, the tip of the inner edge portion is formed so as to become thinner inward. Further, in the above-mentioned embodiment, the purpose of the present invention is to prevent vibration of the body of the automobile. However, the anti-vibration device of the present invention may be intended to prevent vibration of, for example, the engine of the automobile. Needless to say, it is also used. On the other hand, the shapes and dimensions of the outer cylinder, the inner cylinder, the elastic body, etc. are not limited to those of the embodiment.

[0024]

As described above, the vibration isolator of the present invention can provide the partition member made of an elastic material to reduce the processing cost and reduce the rigidity in the direction perpendicular to the axis.

[Brief description of drawings]

FIG. 1 is a sectional view of a vibration isolator according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a vibration control device according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a vibration control device according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a vibration isolation device according to a conventional technique.

[Explanation of symbols]

 10, 100 Vibration isolation device 12, 110 Outer cylinder 12A Locking part 14 Stopper 16A, 16B, 116A, 116B Intermediate cylinder 18, 114 Inner cylinder 20, 118 Partition member 24, 112 Elastic body 26 Hole 30, 124 Diaphragm 34, 122 Restriction Passage Forming Member 34A, 122A Projection Part 34B, 122B Restriction Passage 36, 126 Liquid Chamber 36A, 126A Main Liquid Chamber 36B, 126B Sub Liquid Chamber 120 Ring

Claims (1)

[Claims] 1. An outer cylinder connected to one of the vibration generator and the vibration receiver, an inner cylinder connected to the other of the vibration generator and the vibration receiver and located inside the outer cylinder, and the inner cylinder. An elastic body disposed between the inner cylinder and the outer cylinder so as to connect the outer cylinder side and the outer cylinder side, and at least a part of the partition wall surface is constituted by the elastic body and liquid is sealed. A liquid chamber formed between the inner cylinder and the outer cylinder, a partition member for dividing the liquid chamber in the axial direction, and a limiting passage for communicating between the divided liquid chambers. A cylindrical restricting passage forming member that is a member arranged along the inner peripheral surface of the inner cylinder or the outer cylinder; and a diaphragm that constitutes a part of the partition wall surface of the liquid chamber and is elastically deformable. An anti-vibration device provided, wherein the partition member has an annular shape, and one of an inner edge portion and an outer edge portion thereof is provided. Is fixed to one of the inner cylinder and the outer cylinder, and the other is pre-compressed and brought into contact with the limiting passage forming member, and the other edge of the inner edge and the outer edge of the partition member faces the tip. The anti-vibration device is characterized in that it is formed to be thin.