JP2001132795A - Vibration-control device and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve vibration-control characteristics and while enhancing the function of a bound stopper as a vibration control device is miniaturized. SOLUTION: An inside fitment 20 is positioned in a space surrounded by a bracket fitment 12. An elastic body 16, having a pair of arm parts 16A and 16B for interconnecting the bracket fitment 12 and the inside fitment 20, is vulcanized for adhesion to the two side parts of the inside fitment 20. A rebound stopper 22 made of rubber to suppress over-deformation toward a position above the elastic body 16 is situated in a state of being nipped between the bracket fitment 12 and the inside fitment 20. A bound stopper 26 to suppress excessive deformation toward a position below the elastic body 16 is situated in the position of the bracket fitment 12 positioned opposite to the inside fitment 20 and in a position below the inside fitment 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator for preventing transmission of vibration from a member generating vibration and a method for manufacturing such a vibration isolator. It is applicable to machines and the like.

[0002]

2. Description of the Related Art For example, an anti-vibration device as an engine mount is provided between an engine serving as a vibration generating portion of a vehicle and a vehicle body serving as a vibration receiving portion, and the vibration generated by the engine is prevented. The structure is such that the vibration device absorbs and prevents transmission to the vehicle body side. As an example of the vibration isolator as the engine mount, one having a structure as shown in FIG. 5 is known. That is, as shown in FIG. 5, this vibration isolator has a structure in which the elastic member 116 is connected between the inner member 112 and the bracket 114, and also the inner member 112 has the rebound stopper 11
8 and the bound stopper 120 were integrally attached by vulcanization.

On the other hand, at the time of assembling the vibration isolator, as shown in FIG.
Elastic member 116 and stopper 11
8, 120 and the like are inserted into the bracket 114. At this time, the elastic body 116 is inserted into the bracket 114 while pressing down the rebound stopper 118 and the like as shown by a two-dot chain line by applying a force in the direction of arrow X in FIG. And the rebound stopper 118 is compressed after the insertion. That is, when this vibration isolator is installed in the vehicle, it is necessary to apply a compressive force to the rebound stopper 118 in advance because the load of the engine is applied to the inner member 112 and moves downward.

[0004]

Accordingly, when the elastic member 116 is press-fitted into the bracket 114 at the time of assembling the vibration isolator, the rebound stopper 118 and the inner member 112 are required.
By pressing down, etc., there is a possibility that the bound stopper 120 projects downward and hits the bracket 114.
For this reason, the gap S having a predetermined size is
0 and the bracket 114, the size of the bound stopper 120 is reduced,
Needs to be made larger than necessary.

As a result, after the vibration isolator is completed, the interval until the bound stopper 120 comes into contact with the bracket 114 cannot be freely set, so that not only the function of the bound stopper 120 cannot be sufficiently exhibited, but also the bound stopper 1
20 was too small to sufficiently enhance the vibration-proofing properties. The present invention, in consideration of the above facts, provides a vibration damping device capable of improving the vibration damping characteristics and the function of a bound stopper while reducing the size of the vibration damping device, and a method of manufacturing such a vibration damping device. The purpose is to do.

[0006]

According to a first aspect of the present invention, there is provided an anti-vibration device, wherein an inner member which can be connected to one of a vibration generating portion and a vibration receiving portion while receiving a load, and an outer peripheral side of the inner member. A cylindrical outer member that can be connected to the other of the vibration generating portion and the vibration receiving portion, and vulcanized and bonded to the inner member, and is press-fitted into the outer member and disposed between the inner member and the outer member. An elastic body that can be elastically deformed by being mounted, a rebound stopper that is installed above the inner member in the outer member and suppresses deformation of the elastic body, and is installed at a position of the outer member that faces the inner member below the inner member. And a bound stopper for suppressing deformation of the elastic body.

The operation of the vibration isolator according to claim 1 will be described below. The inner member is connected to any of the vibration generating unit and the vibration receiving unit while receiving a load, and the elastic body is
It is vulcanized and bonded to the inner member and pressed into the outer member, and is disposed between the inner member and the outer member. Therefore, when vibration is transmitted from the vibration generating unit connected to either the inner member or the outer member, the elastic member disposed between the inner member and the outer member is elastically deformed and this elastic member is deformed. As a result, the vibration is reduced, so that the vibration is reduced, and the vibration is less likely to be transmitted to the vibration receiving unit side.

[0008] A rebound stopper is provided above the inner member in the outer member, and a bound stopper is provided at a position of the outer member that is below the inner member and faces the inner member. Therefore, when an elastic member is deformed so that an excessively large vibration is input to the vibration isolator and the inner member moves upward, the rebound stopper suppresses the deformation of the elastic member, and the vibration having the excessively large amplitude also occurs. When the elastic member is deformed so as to move the inner member downward due to the input, the inner member contacts the bound stopper, and the bound stopper suppresses the deformation of the elastic member.

On the other hand, when the vibration isolator is assembled, the elastic body is pressed into the outer member. At this time, a rebound stopper is installed so that a compressive force is applied between the inner member and the outer member in advance. Install a separate bound stopper below. With this configuration, when the vibration generating unit, for example, the engine is mounted in a form connected to the inner member, the inner member descends due to the load of the engine, and the compressive force on the rebound stopper is reduced.

Furthermore, at the time of assembling, it is not necessary to consider the size of the gap between the outer member and the bound stopper when the elastic body is pressed into the outer member, so that the assemblability is improved, and the The height and shape of the stopper can be freely changed, so that both the anti-vibration performance and the function of the bound stopper can be achieved.

As a result, the vibration isolator can be used mainly in a region where the elasticity of the rebound stopper is not applied and only the elastic body has a low spring constant. Furthermore, by freely changing the height and shape of the bound stopper, the amount of deflection of the elastic body at which the inner member comes into contact with the bound stopper and the elasticity of the bound stopper starts to be applied is, for example, smaller than that of the conventional vibration damping device. In addition, the anti-vibration characteristics can be improved, and accordingly, the degree of freedom of the non-linearity of the spring constant as the engine mount can be increased. In addition, as it becomes unnecessary to consider the size of the gap between the outer member and the bound stopper when the elastic body is pressed into the outer member, the outer member is reduced in size to reduce the size of the vibration isolator. It becomes possible to plan.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same configuration as that of the first aspect and operates in the same manner. However, the elastic body and the rebound stopper are made of rubber, and the elastic body and the rebound stopper are integrally vulcanized and bonded to the inner member. Having a configuration. Therefore, since the elastic body and the rebound stopper are integrally vulcanized and bonded, the number of processing steps is reduced, and the processing cost of the vibration isolator is reduced.

The operation of the vibration isolator according to claim 3 will be described below. This claim has the same configuration as that of the first aspect and operates in the same manner, but has a configuration in which the bound stopper is made of rubber. Therefore, even when the inner member moves downward due to the input of vibration having an excessive amplitude, even if the inner member is in direct contact with the bound stopper, the bound stopper is flexibly deformed. Deformation can be suppressed.

The operation of the vibration isolator according to claim 4 will be described below. The present invention has the same configuration as that of the first aspect and operates similarly, but has a configuration in which the bound stopper is made of synthetic resin. Therefore, when an excessive amplitude of vibration is input and the inner member moves downward and the inner member abuts against the bound stopper, the elastic body is deformed with a different spring constant than when a rubber bound stopper is used. Thus, the amount of deformation of the elastic body can be made smaller than that of, for example, a rubber bound stopper.

The operation of the vibration isolator according to claim 5 will be described below. The present invention has the same configuration as that of the first aspect and operates in the same manner, but has a configuration in which a metal plate is disposed at an end of the elastic body. Therefore, the elastic body does not directly contact the outer member at the time of press-fitting into the outer member, but comes into contact with the outer member and the metal plate member. Even if amplitude vibration is input, the initial structure of the vibration isolator can be reliably maintained.

The operation of the vibration isolator according to claim 6 will be described below. The present invention also has a configuration similar to that of the first aspect and operates similarly, but has a configuration in which the other member of the vibration generating unit and the vibration receiving unit is an engine. Therefore, the inner member moves downward by the load of the engine, and the compressive force of the rebound stopper is reduced.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a vibration isolator, comprising: vulcanizing and bonding an elastic body and a rebound stopper to an inner member;
Next, the inner member and the elastic member are set in the outer member while the elastic member is pressed into the cylindrical outer member. With this, the rebound stopper is moved inside the outer member in a state where a compressive force is applied in advance. It is installed above the member, and thereafter, a bound stopper is installed at a position of the outer member facing the inner member below the inner member.

The operation of the method for manufacturing a vibration isolator according to claim 7 will be described below. After the elastic member and the rebound stopper are vulcanized and bonded to the inner member, the inner member and the elastic member are placed in the outer member while the elastic member is pressed into the outer member. At this time, the rebound stopper is installed above the inner member in the outer member in a state where a compressive force is applied in advance. Thereafter, the bound stopper is provided at a position of the outer member below the inner member and facing the inner member.
Therefore, when the vibration generating portion, for example, the engine is mounted so as to be connected to the inner member, the load of the engine lowers the inner member to reduce the compressive force on the rebound stopper, and the same effect as in claim 1 To play.

The operation of the method for manufacturing a vibration isolator according to claim 8 will be described below. This claim also has the same configuration as that of claim 7 and operates in the same manner, but when the elastic body and the rebound stopper are vulcanized and bonded to the inner member, these elastic body and the rebound stopper are integrally formed on the inner member. It has a configuration for vulcanization bonding. Therefore, as in the case of the second aspect, the elastic body and the rebound stopper are integrally vulcanized and bonded, whereby the number of processing steps is reduced and the processing cost of the vibration isolator is reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show a vibration isolator according to an embodiment of the present invention, and the present embodiment will be described with reference to these drawings. As shown in FIGS. 1 and 2, the vibration damping device 10 of the present embodiment includes, as an outer member, a bracket 12 formed in a rectangular ring shape with four flat sides, respectively. A vehicle body (not shown) as a vibration receiving portion is connected by fastening or fitting a bolt (not shown). A pair of side walls 12A and 12B of the four sides of the bracket 12 are
They are formed in a tapered shape in which the lower side narrows while facing each other, and the facing surfaces of these side walls 12A and 12B have
Each of the receiving portions 14 is formed one step lower than the surroundings.

On the other hand, in the space surrounded by the bracket 12, an inner fitting 20, which is a trapezoidal inner member whose lower side is narrowed, is located. And this inner fitting 20
A bolt (not shown) is inserted into the
Engine (not shown) serving as inner metal fitting 20 and vibration generator
Are connected, and accordingly, the inner metal fitting 20
Are designed to receive the load of the engine.

Further, as shown in FIGS. 1 and 2, on the outer peripheral side of the inner metal fitting 20, there is provided a rubber material which connects the bracket metal 12 and the inner metal fitting 20 with a pair of arms 16A and 16B. An elastic body 16 is provided by being vulcanized and bonded, and the ends of the arms 16A and 16B of the elastic body 16 are
Plates 18, each of which is a metal plate, are arranged at an inclination corresponding to the receiving portion 14. Therefore, the elastic body 16 is pressed into the bracket 12 while the plate 18 is in contact with the receiving portion 14 of the bracket 12.

On the other hand, above the inner fitting 20 in the bracket fitting 12, a rubber rebound stopper 22 for suppressing excessive upward deformation of the elastic body 16 forms an upper side of the bracket fitting 12. It is installed so as to be sandwiched between the upper side 12 </ b> C and the inner metal fitting 20.
The lower side 1 forming the lower side of the bracket 12
The central portion of the upper surface of the 2D is formed one step lower than the periphery, and a stopper 24 made of steel is joined to this portion by bonding, welding, or the like. A rubber bound stopper 26 projecting upward is provided. That is, a bound stopper 26 for suppressing excessive downward deformation of the elastic body 16 is provided at a position of the bracket fitting 12 below the inner fitting 20 and facing the inner fitting 20.

Next, assembly of the vibration isolator 10 according to the present embodiment will be described. When assembling the vibration isolator 10,
First, a steel plate as a metal material is cut and bent by press working or the like, and furthermore, for example, both ends of the steel plate are joined by welding to form an annular bracket member 12 shown in FIG.
Is prepared. Along with this, the elastic body 16, the rebound stopper 22 and the bound stopper 26 are vulcanized and formed. In this vulcanization molding, the rebound stopper 22 and the elastic body 16 are integrally vulcanized and formed. The elastic body 16 and the rebound stopper 22 are integrally vulcanized and bonded to the inner fitting 20. That is, as shown in FIG. 3, the pair of arms 1 of the elastic body 16
6A and 16B are respectively vulcanized and adhered.
In addition to vulcanizing and bonding the tip of 16B and the plate 18, respectively, a rebound stopper 22 is vulcanized and bonded to the upper surface of the inner fitting 20.

As a result, since the rubber elastic body 16 and the rebound stopper 22 are respectively integrally vulcanized and bonded to the inner metal fitting 20, the number of processing steps is reduced, and the processing cost of the vibration isolator 10 is reduced. Further, separately from this, a vulcanizing stopper 26 is vulcanized and bonded to a stopper base 24 as shown in FIG.

Next, the elastic member 16 is pressed into the bracket 12 while the plate 18 is slid along the receiving portion 14, so that the inner metal member 20 and the elastic member 16
2 is installed. At this time, the elastic body 16 is press-fitted into the bracket fitting 12 while the rebound stopper 22 and the inner fitting 20 are pushed down in the direction of the arrow X in FIG. It is installed without any problem above the inner fitting 20 in the inside 12.

As a result, the rebound stopper 22
The bracket member 12 and the elastic member 16 are connected in such a manner that the elastic member 16 is sandwiched between the pair of receiving portions 14 of the bracket member 12 while a compressive force is applied to the bracket member 12. Thereafter, the stopper base 24 is joined and fixed to the lower side 12 </ b> D of the bracket fitting 12, so that the inner fitting 2 is located below the inner fitting 20.
A bound stopper 26 is installed at a position of the bracket fitting 12 opposite to “0”.

As described above, in the state shown in FIG. 2A, the bracket fitting 12, the elastic body 16, the inner fitting 20,
The assembly of the vibration isolator 10 including the rebound stopper 22 and the bound stopper 26 is completed. By connecting the inner fitting 20 of the completed vibration isolator 10 to the engine via bolts, and connecting the bracket 12 to the vehicle body via bolts, the vibration isolator 10 can be connected to the engine and the vehicle body. It will be arranged between. In connection with this, the inner fitting 20
Is lowered from the position shown in FIG.
Is deformed, the compressive force on the rebound stopper 22 is reduced, and for example, a gap is generated between the rebound stopper 22 and the bracket 12 as shown in FIG.

Next, the operation of the vibration isolator 10 of the present embodiment assembled and manufactured as described above will be described. By disposing the vibration isolator 10 of the present embodiment between the vehicle body and the engine, the inner fitting 20 is connected to the engine while the engine is mounted and receiving a load.
Are vulcanized and bonded to the inner metal fittings 20 and press-fitted into the bracket metal fittings 12 to be disposed between the bracket metal fittings 12 and the inner metal fittings 20. For this reason, the inner fitting 20
When vibrations are transmitted from the engine side by operating the engine connected to the
Vibration is transmitted to an elastic body 16 disposed between the elastic member 16 and the elastic body 16 and elastically deformed, and the vibration is attenuated by the elastic body 16. That is, when the vibration from the engine side is transmitted, the elastic body 1
Numeral 6 acts as a vibration absorber and absorbs and attenuates the vibration by a vibration damping function based on the internal friction of the elastic body 16, so that the vibration is hardly transmitted to the vehicle body side.

Further, a rebound stopper 22 is provided above the inner metal fitting 20 in the bracket metal fitting 12,
A bound stopper 26 is provided at a position below the inner fitting 20 and at a position of the bracket fitting 12 facing the inner fitting 20. Therefore, when the vibration having an excessive amplitude is input to the vibration isolator 10 and the elastic body 16 is deformed so that the inner metal fitting 20 moves upward in FIGS. 1 and 2B,
When the inner metal fitting 20 comes into strong contact with the rebound stopper 22, the rebound stopper 22
Suppress the deformation of Similarly, when the vibration having the excessive amplitude is input and the elastic body 16 is deformed so that the inner fitting 20 moves downward in FIG. 1 and FIG.
When the “0” contacts the bound stopper 26, the bound stopper 26 suppresses the deformation of the elastic body 16.

On the other hand, when the vibration isolator 10 is assembled, the elastic body 16 is press-fitted into the bracket 12 as described above. At this time, the rebound is applied so that a compressive force is applied between the inner metal 20 and the bracket 12 in advance. The stopper 22 is installed, and then a separate bound stopper 26 is installed below the inner fitting 20. According to this configuration, when the engine is connected to and mounted on the inner fitting 20 as in the present embodiment, the inner fitting 20 descends due to the load of the engine, and the compressive force on the rebound stopper 22 is reduced. A gap is created between the rebound stopper 22 and the bracket 12.

Further, at the time of assembling, when the elastic member 16 is pressed into the bracket 12
It is not necessary to consider the size of the gap between the and the bound stopper 26, so that the assemblability is improved, and accordingly, the height and shape of the bound stopper 26 can be freely changed, so that the anti-vibration performance and the Function compatibility can be achieved.

As a result, the characteristic of the spring constant is as shown by a characteristic curve A in FIG. 4 indicated by a solid line, and the vibration isolator is provided mainly around a region where the elasticity of the rebound stopper 22 is not applied and only the elastic body 16 has a low spring constant. 10 can be used. Further, by freely changing the height and the shape of the bound stopper 26, the minimum value of the amount of deflection BH at the inflection point at which the elasticity of the bound stopper 120 starts to be added in the characteristic curve B of the conventional vibration isolator shown by the dotted line. Accordingly, the vibration isolation characteristic can be improved by further reducing the amount of deflection AH, for example, and accordingly, the degree of freedom of the non-linearity of the spring constant as the engine mount can be increased.

Here, the vertical axis in FIG. 4 represents the magnitude of the load applied to the vibration isolator 10, and the horizontal axis represents the amount of deflection. Also,
On the horizontal axis, the leftward shift indicates the amount of deflection caused by the movement of the inner fitting 20 toward the bound stopper 26, and the rightward shift on the horizontal axis indicates the amount of deflection caused by the movement of the inner fitting 20 toward the rebound stopper 22 side. Represents the size of.

In addition, it is not necessary to consider the size of the gap between the bracket 12 and the bound stopper 26 when the elastic body 16 is pressed into the bracket 12, so that the bracket 12 is made smaller. Vibration isolator 1
0 can be reduced in size.

On the other hand, in the present embodiment, as described above, since the bound stopper 26 is made of rubber, when the vibration of the excessive amplitude is input and the inner metal fitting 20 moves downward, the present embodiment is used. Even when the inner fitting 20 is in direct contact with the bound stopper 26 as in the embodiment, since the bound stopper 26 is flexibly deformed, the elastic member 16 can be used without any problem.
Can be suppressed. However, the bound stopper 26 may be made of synthetic resin. In this case, when an excessive amplitude of vibration is input and the inner metal fitting 20 moves downward and the inner metal fitting 20 abuts against the bound stopper 26, the elasticity is changed by a spring constant different from that when the rubber bound stopper 26 is used. The body 16 is deformed, and the amount of deformation of the elastic body 16 can be made smaller than that of the rubber bound stopper 26, for example. Further, the spring constant can be set to an arbitrary value by changing the shape of the bound stopper 26 to an arbitrary shape.

Further, a metal plate 18 is disposed at an end of the elastic body 16, and the plate 18 is fixed to the receiving portion 14 of the bracket 12. Therefore, the elastic body 16 does not come into direct contact with the bracket 12 at the time of press-fitting into the bracket 12 and the bracket 12
And the contact with the metal plate 18, the friction coefficient is increased and slippage is difficult between them, and the plate 18 is fixed to the receiving portion 14 formed one step lower, so that slippage is further reduced. Even if vibrations of excessive amplitude are input, the initial structure of the vibration isolator 10 can be reliably maintained.

In the above-described embodiment, the bracket fitting 12 is connected to the vehicle body serving as the vibration receiving section, and the inner fitting 20 is connected to the engine side serving as the vibration generating section. It is good also as composition. Further, although the bracket fitting 12 and the inner fitting 20 are made of steel, they may be made of another metal material, or may be made of another material such as a synthetic resin material.

On the other hand, in the embodiment, the purpose of the present invention is to dampen the body of a vehicle such as an automobile. However, it goes without saying that the anti-vibration device of the present invention can be used for other uses than automobiles. Further, the shapes and dimensions of the bracket, the inner metal, the elastic body, and the like are not limited to those of the embodiment.

[0040]

As described above, the anti-vibration device and the method of manufacturing the anti-vibration device of the present invention are configured as described above, so that the anti-vibration characteristics and the function of the bound stopper are improved while the size of the anti-vibration device is reduced. It has an excellent effect that it can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vibration isolator according to one embodiment of the present invention.

FIGS. 2A and 2B are front views showing a vibration isolator according to an embodiment of the present invention, in which FIG. 2A is a diagram showing a state before an engine load is applied, and FIG. It is a figure showing a state.

FIG. 3 is an exploded perspective view for explaining the assembly of the vibration isolator according to one embodiment of the present invention.

FIG. 4 is a graph showing a characteristic of a spring constant of the vibration isolator according to the embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional vibration isolator.

FIG. 6 is an exploded perspective view for explaining assembly of a conventional vibration isolator.

FIG. 7 is a front view showing a conventional vibration isolator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Bracket bracket 16 Elastic body 20 Inner bracket 22 Rebound stopper 26 Bound stopper

Claims (8)

[Claims] 1. An inner member which can be connected to one of a vibration generating portion and a vibration receiving portion while receiving a load on one of the vibration generating portion and a vibration receiving portion; and an outer member disposed on the outer peripheral side of the inner member and connected to the other of the vibration generating portion and the vibration receiving portion. A tubular outer member which can be vulcanized and bonded to the inner member and press-fitted into the outer member while being disposed between the inner member and the outer member so as to be elastically deformable; A rebound stopper installed above the inner member to suppress deformation of the elastic body; and a bound stopper installed at a position of the outer member facing the inner member below the inner member and suppressing deformation of the elastic body. An anti-vibration device characterized by having. 2. The elastic member and the rebound stopper are made of rubber, and the elastic member and the rebound stopper are integrally vulcanized and bonded to the inner member.
Anti-vibration device as described. 3. The vibration isolator according to claim 1, wherein the bound stopper is made of rubber. 4. The vibration isolator according to claim 1, wherein the bound stopper is made of a synthetic resin. 5. The vibration isolator according to claim 1, wherein a metal plate is disposed at an end of the elastic body. 6. The vibration damping device according to claim 1, wherein the other member of the vibration generator and the vibration receiver is an engine. 7. An elastic member and a rebound stopper are vulcanized and bonded to the inner member, and then the inner member and the elastic member are installed in the outer member while the elastic member is pressed into the cylindrical outer member. Then, the rebound stopper is installed above the inner member in the outer member in a state where a compressive force is applied in advance, and thereafter, the bound stopper is installed at a position of the outer member facing the inner member below the inner member, A method of manufacturing a vibration isolator, comprising: 8. An anti-vibration device according to claim 7, wherein when the elastic body and the rebound stopper are vulcanized and bonded to the inner member, the elastic body and the rebound stopper are integrally vulcanized and bonded to the inner member. Device manufacturing method.