JPH07158687A - Vibration control device - Google Patents

Abstract

PURPOSE:To attin light weight and reduce machining members while maintaining a damping characteristic. CONSTITUTION:A rubber elastic body 16 with a connecting part 16A extended onto the outer cylinder 12 side from the periphery of an inner cylinder fitting 14 is disposed between the inner cylinder fitting 14 and the outer cylinder 12. A stopper 20 is formed on the inner peripheral surface side of the outer cylinder 12 in such a way as to be opposed to the inne cylinder fitting 14. A liquid chamber 26 is provided in the stopper 20 and the outer cylinder 12 and filled with liquid. A partition wall member 28 is disposed in the liquid chamber 26 so as to divide the liquid chamber 26 into a main liquid chamber 26A and an auxiliary liquid chamber 26B, and an orifice 30 for communicating these chambers is formed on the outer peripheral surface of the partition wall member 28. Accordingly, when vibration is transmitted, the connecting part 16A comes in contact to deform the stopper 20, and pressure change or the like is generated to the liquid in the orifice 30 so as to damp the vibration not only by the deformation of the elastic body 16 but also by the pressure change or the like of the liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator that absorbs vibrations from a vibration generator, and is applicable to, for example, automobiles and general industrial machines, and is particularly suitable for engine mounts.

[0002]

2. Description of the Related Art For example, a vehicle is provided with an anti-vibration device as an engine mount between an engine which is a vibration generating part and a vehicle body which is a vibration receiving part. The vibration device absorbs the vibration and prevents the vibration from being transmitted to the vehicle body.

That is, as this vibration isolator, an elastic body made of rubber and a pair of liquid chambers are provided in the vibration isolator, and
It is known that these liquid chambers are communicated with each other through a restricted passage serving as an orifice. Then, when the mounted engine operates to generate vibration, the vibration is absorbed by the vibration damping function of the elastic body and the viscous resistance of the liquid in the orifice that connects these liquid chambers to transmit the vibration. It is supposed to block.

However, the conventional vibration-proof device is manufactured by pressing a steel material or the like and joining the pressed members by welding or the like to form a part such as an outer cylinder to manufacture the vibration-proof device. In addition to the excessive weight of itself, the labor required for manufacturing the vibration isolation device has been excessive. For this reason, there has been a demand for reducing the weight of the vibration isolator and reducing the number of processing steps in order to save energy.

[0005]

SUMMARY OF THE INVENTION In consideration of the above facts, according to the present invention, the outer cylinder is formed of resin and the liquid chamber is built in, so that the damping characteristics are maintained, the weight is reduced, and the number of processing steps is reduced. It is an object of the present invention to provide an anti-vibration device.

[0006]

A vibration isolator according to the present invention comprises an outer cylinder connected to one of a vibration generating portion and a vibration receiving portion and integrally formed of resin, a vibration generating portion and a vibration receiving portion. An inner cylinder connected to the other and arranged inside the outer cylinder; and an elastic body arranged between the outer cylinder and the inner cylinder so as to connect the outer cylinder and the inner cylinder. A liquid chamber in which at least a part of the inner wall is formed of the elastic body and the other part is opened, and between the pair of liquid chambers which divide the liquid chamber into the elastic body side and the open side. A partition wall member having a passage formed therein, a diaphragm that seals the open portion of the liquid chamber to seal the liquid in the liquid chamber,
It is characterized by having.

[0007]

Since the elastic body connects the outer cylinder and the inner cylinder and the inner cylinder or the outer cylinder is connected to the vibration generator, the vibration is transmitted from the vibration generator to the inner cylinder or the outer cylinder. Then, the elastic body is deformed, and as a result, the vibration is attenuated by the deformation of the elastic body, and it becomes difficult to transmit the vibration to the vibration receiving portion side connected to the outer cylinder or the inner cylinder.

Further, a liquid chamber in which a part of the inner wall is formed of an elastic body and the other part is opened is provided, and the opened part of the liquid chamber is sealed by a diaphragm so that the liquid is stored in the liquid chamber. Is enclosed. The partition wall partitioning the liquid chamber into the elastic body side and the open side is formed with a passage communicating between the liquid chambers.

Therefore, when the vibration is transmitted from the vibration generating portion side, the elastic body is deformed, the liquid chamber on the elastic body side is expanded / contracted accordingly, and the diaphragm is deformed, so that the pressure of the liquid in the passage is changed. As a result, not only the deformation of the elastic body but also the change in pressure of the liquid and the viscous resistance dampen the vibration, and it becomes difficult to transmit the vibration to the vibration receiving portion side.

Further, in manufacturing the vibration isolator according to the present invention, since the outer cylinder is integrally molded with resin, it is possible to reduce the weight of the vibration isolator and it is not necessary to process the outer cylinder by pressing or the like. Thus, the processing process is simplified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolation device according to an embodiment of the present invention is shown in FIGS. 1 and 4, and this embodiment will be described with reference to these drawings.

As shown in FIG. 1, a vibration isolator 1 of this embodiment.
Reference numeral 0 denotes a bracket-integrated outer cylinder 12 which is integrally molded of synthetic resin, and is embedded in a nut 13 fixed to the outer cylinder 12 toward the vehicle body (not shown) of the automobile as a vibration receiving portion. This outer cylinder 12 is screwed by using. Therefore, the outer cylinder 12 is connected to the vehicle body.

Inside the outer cylinder 12, an inner cylinder fitting 14 formed in a tubular shape is arranged so as to be parallel to the axis of the outer cylinder 12, and a bolt (not shown) is screwed into the inner cylinder fitting 14. As a result, the inner tubular member 14 and the engine (not shown) that serves as the vibration generating portion are connected.

On the other hand, an outer peripheral portion 16B formed in a ring shape along the inner peripheral surface of the outer cylinder 12 is provided between the inner cylindrical metal fitting 14 and the outer cylinder 12, and the periphery of the inner cylindrical metal fitting 14 is provided. An elastic body 16 made of rubber having a connecting portion 16A extending in a beam shape is provided on the outer cylinder 12 side. The outer peripheral side of the elastic body 16 is adhered over the entire inner peripheral surface of the outer cylinder 12, and the inner peripheral side is vulcanized and adhered to the outer peripheral surface of the inner cylinder fitting 14.

Therefore, in order to facilitate the displacement of the inner cylindrical metal member 14 in the upper and lower positions of the connecting portion 16A in the vertical direction which is the main vibration direction of the vibration isolator 10, the horizontal direction in FIG. The upper hole portion 22 and the lower hole portion 24 are formed so as to extend in the axial direction of the inner tubular member 14, respectively.

Further, a pair of stoppers 18, 20 are provided at positions of the outer peripheral portion 16B located on the inner peripheral surface side of the outer cylinder 12 facing the inner cylindrical metal member 14 through the upper hole portion 22 and the lower hole portion 24, respectively. Are formed so as to protrude from the outer peripheral portion 16B. The stoppers 18 and 20 prevent the connecting portion 16A of the elastic body 16 from being excessively deformed, and the outer cylinder 1
Excessive displacement of the inner tubular member 14 with respect to 2 is suppressed. Therefore, not only the durability of the elastic body 16 is improved, but also unnecessary engine movement can be restricted to improve the riding comfort of the automobile.

On the other hand, inside the lower stopper 20 and the outer cylinder 12, there is provided a liquid chamber 26 formed by the inner wall surfaces of these members, and a liquid such as water or oil is sealed therein. A partition material 28 made of a resin material and having an inverted U-shaped cross section is arranged in the liquid chamber 26, and the liquid chamber 26 is divided into a main liquid chamber 26A and a sub liquid chamber 26B.
It is divided into two parts. Further, on the outer peripheral surface of the partition wall member 28, an orifice 30 is formed, which serves as a passage for almost one round along the outer peripheral surface.

Further, as shown in FIG. 1, the orifice 30
A small hole 32 that connects the main liquid chamber 26A and the inside of the orifice 30 is formed on one end side of the, and a small hole 34 that connects the sub liquid chamber 26B and the inside of the orifice 30 is formed on the other end side of the orifice 30. Has been formed. Therefore, the orifice 30 and the small holes 32, 34 connect the main liquid chamber 26A and the sub liquid chamber 26B.

The lower end portion of the outer peripheral surface of the partition member 28 projects outward from the opening 12A of the outer cylinder 12 which is an open portion of the liquid chamber 26, and is arranged below the partition member 28. The outer peripheral portion of the diaphragm 36 that seals the opened portion of the liquid chamber 26 and the lower end portion of the outer peripheral surface of the partition member 28 are both caulked and fixed to the outer cylinder 12 by the lid member 38. Further, an air chamber 40 is provided between the diaphragm 36 and the lid member 38, so that the diaphragm 36 can be deformed.

When the anti-vibration device 10 is installed in the vehicle body, the force P due to the load of the engine is applied to the inner tubular metal member 14
2A, the inner tubular metal fitting 14 of FIG. 2B is moved downward, and the gap between the connecting portion 16A and the stopper 20 is eliminated. That is, the stopper 20 suppresses an excessive displacement of the inner tubular metal member 14, and
It deforms with the displacement of the inner tubular member 14, and expands and contracts the main liquid chamber 26A.

Next, the assembly of the vibration isolator 10 according to this embodiment will be described. When assembling the vibration isolator 10, a ring-shaped outer peripheral portion 16B, stoppers 18 and 20 projecting from the outer peripheral portion 16B, and an inner tubular metal member 14 are formed.
An elastic body 16 having a connecting portion 16A extending from the periphery of the inner cylinder fitting 14 to the outer cylinder 12 side is vulcanized and adhered around the inner cylinder fitting 14 and
The state shown in FIG. Furthermore, this elastic body 1
The inner tubular metal member 14 in the state where 6 is bonded is inserted into a molding die 42 composed of an upper die 42A, a middle die 42B and a lower die 42C as shown in FIG. By injecting a resin material between the outer tube 12 and 42, the resin outer cylinder 12 is integrally injection-molded, and the state shown in FIG. 3B is obtained.

Then, in the liquid, the stopper 20 and the outer cylinder 1
After inserting the partition wall material 28 and the diaphragm 36 into the liquid chamber 26 which is the hole formed in 2, the vibration isolator 10 is taken out of the liquid, and the outer periphery of the partition wall material 28 and the diaphragm 36 is covered with the lid material 38. By caulking the portion, the opened portion of the liquid chamber 26 is reliably sealed by the diaphragm 36, and the liquid is sealed in the liquid chamber 26.

Furthermore, the vibration isolator 1 thus completed
Screw the outer cylinder 12 of 0 to the car body side to connect it,
Further, the inner tubular metal piece 14 is connected to the engine via a bolt. At this time, due to the load of the engine, the connecting portion 16A
The lower end side of the above contacts the upper part of the stopper 20.

Next, the operation of this embodiment will be described. When the engine vibration is transmitted to the inner cylinder fitting 14, the elastic body 16 is deformed and the vibration is attenuated, and the vibration transmitted to the vehicle body side connected to the outer cylinder 12 is reduced.

Further, as shown in FIGS. 3 and 4, when the vibration isolator 10 is assembled, the outer cylinder 12 is integrally molded of a resin material, and the inner cylinder side of the outer cylinder 12 is The stoppers 18 and 20 are formed so as to project at positions facing the tubular fitting 14 with a space defined by the holes 22 and 24 therebetween. Therefore, when manufacturing the vibration isolator 10, it is not necessary to separately manufacture the stoppers 18 and 20 for restricting the displacement of the inner cylinder fitting 14, and the stopper 1 is attached to the outer cylinder 12.
The step of attaching 8 and 20 is unnecessary. Furthermore, since the outer cylinder 12 is integrally molded with resin, the vibration isolator 10 can be made lighter in weight and the outer cylinder 12 does not need to be processed by pressing or the like, which simplifies the machining process of the vibration isolator 10. Be converted. Therefore, it is possible to reduce the number of parts and the number of processing steps and reduce the manufacturing cost of the vibration isolator 10.

On the other hand, the diaphragm 36 seals the open portion of the liquid chamber 26 to seal the liquid in the liquid chamber 26. An orifice 30 that connects the main liquid chamber 26A and the sub liquid chamber 26B is formed in the partition wall material 28 that partitions the liquid chamber 26 between the stopper 20 side and the open side.

Therefore, when the vibration is transmitted from the engine side, the stopper 20 with which the connecting portion 16A is in contact is deformed, and accordingly, the main liquid chamber 26A on the stopper 20 side is expanded / contracted and the diaphragm 36 is deformed. Then, a pressure change, a viscous resistance, or the like is generated in the liquid in the orifice 30, and the vibration is attenuated not only by the deformation of the elastic body 16 but also by the pressure change of the liquid, so that the vibration is hard to be transmitted to the vehicle body side.

In the above embodiment, the outer cylinder 12 is connected to the vehicle body side which is the vibration receiving portion, and the inner cylinder fitting 14 is connected to the engine side which is the vibration generating portion. It may be configured. Further, the liquid chamber 26 is formed in the stopper 20 which is a part of the elastic body 16.
The liquid chamber 26 may be formed in another portion of the lower portion 6 and the lower hole portion 24 which is a space between the connecting portion 16A and the stopper 20.
Alternatively, the connecting portion 16A may have a liquid chamber.

In the above embodiment, the inner cylinder is made of metal fittings, but it may be made of resin. Further, ABS, polyacetal and the like are considered as the kinds of resin material used in the above embodiment. Is not limited to.

On the other hand, although the purpose of the present invention is to prevent the vibration of the engine mounted on the automobile, the vibration isolator of the present invention can be used, for example, in the body mount of the automobile or in other applications other than the automobile. Needless to say, the shapes and dimensions of the elastic body, stopper, etc. are not limited to those of the embodiment.

[0031]

As described above, according to the vibration isolator of the present invention, the outer cylinder is made of resin and the liquid chamber is built in, so that the damping characteristics are maintained, the weight is reduced, and the number of processing steps is increased. Has the excellent effect of being reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a vibration damping device according to an embodiment of the present invention.

FIG. 2 is a front view showing a vibration damping device according to an embodiment of the present invention, in which (a) is a view before being incorporated in a vehicle,
(B) is a figure after assembling to a vehicle.

3A and 3B are explanatory views showing the manufacture of the vibration damping device according to the embodiment of the present invention, FIG. 3A is a view showing a state where an elastic body is vulcanized in the inner tubular fitting, and FIG. It is a figure showing the assembly after the shaping | molding of a cylinder.

FIG. 4 is a conceptual diagram showing a molding die for a vibration damping device according to an embodiment of the present invention.

[Explanation of symbols]

 10 Vibration Isolator 12 Outer Cylinder 14 Inner Cylinder Metal Fitting (Inner Cylinder) 16 Elastic Body 20 Stopper (Elastic Body) 26 Liquid Chamber 28 Partition Material 30 Orifice (Passage) 36 Diaphragm

Claims (1)

[Claims] 1. An outer cylinder connected to one of the vibration generating section and the vibration receiving section and integrally molded with resin, and connected to the other of the vibration generating section and the vibration receiving section and arranged inside the outer cylinder. An inner cylinder, an elastic body arranged between the outer cylinder and the inner cylinder so as to connect the outer cylinder and the inner cylinder, and at least a part of an inner wall is formed of the elastic body. A liquid chamber in which the other part of the liquid chamber is opened, and a partition member in which the liquid chamber is divided into the elastic body side and the open side, and a passage is formed which communicates between a pair of divided liquid chambers, A diaphragm for sealing an opened portion of the liquid chamber to seal the liquid in the liquid chamber, and a vibration isolator.