JPH11166577A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform drawing without generating the deformation, buckling and dislocation of an outer member. SOLUTION: An intermediate cylinder 18 is fitted to the inner peripheral surface side of an outer cylinder fitting 16, and an elastic body 20 is vulcanization-bonded to the intermediate cylinder 18. An inner cylinder fitting 22 extended parallel with the axis of the intermediate cylinder 18 and formed of a pair of inner cylinder forming members 22A is arranged at the center part of the elastic body 20, and the elastic body 20 is vulcanization-bonded to the inner cylinder fitting 22. That is, a connecting member 28 is inserted in a pair of inner cylinder forming members 22A to connect a pair of inner cylinder forming members 22A to each other, thus forming the inner cylinder fitting 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator used for an engine mount, a member mount, various bushes, and the like of an automobile.

[0002]

2. Description of the Related Art Heretofore, there has been known, for example, one in which a vibration isolator as an engine mount is disposed between an engine of an automobile and a vehicle body. As an example of this vibration isolator,
A structure in which a rubber elastic body is formed between the inner cylinder and the intermediate cylinder while being vulcanized and bonded, and the outer cylinder is further covered with the intermediate cylinder, and the outer cylinder is drawn in a liquid to form a liquid chamber inside. There are things.

In the case of such a vibration isolator, the outer diameter of the elastic body is increased in advance in order to remove the residual strain of the elastic body during the vulcanization bonding and to improve the durability of the elastic body. ,
The elastic body is drawn along the radial direction along with the outer cylinder and the intermediate cylinder to compress and deform the elastic body.
As shown in US Pat. No. 7393, the intermediate cylinder is divided into two parts in advance and the length of the elastic body along the radial direction is increased, and the intermediate cylinders are attracted to each other along the axial direction.
Compression deformation of an elastic body has been performed.

[0004]

However, when the elastic body is radially drawn together with the outer cylinder and the intermediate cylinder, it is necessary to perform the drawing with a large drawing ratio. During this time, the adhesive layer may be broken, or the outer cylinder and the intermediate cylinder subjected to the drawing process may be deformed or buckled.

[0005] In the case of a structure in which the intermediate cylinder is divided, not only is it expected that drawing will be difficult because of the division, but also the direction perpendicular to the axial direction of the pieces constituting the intermediate cylinder. Displacement is likely to occur. For this reason, in a liquid-containing vibration isolator having a liquid chamber in which a liquid is sealed, a displacement of the intermediate cylinder occurs when the outer cylinder is covered and drawn.
There is a possibility that the sealing performance of the liquid chamber may be deteriorated.

The present invention has been made in view of the above circumstances, and has as its object to provide a vibration isolator which can be drawn without causing deformation, buckling, and displacement of the outer member.

[0007]

According to a first aspect of the present invention, there is provided an anti-vibration device comprising: a cylindrical outer member connected to one of a vibration generating portion and a vibration receiving portion; A pair of inner cylinder forming members arranged inside and connected to the other of the vibration generating unit and the vibration receiving unit, and are arranged while being vulcanized and bonded between the pair of inner cylinder forming members and the outer member, and when a vibration is generated. It is characterized by comprising a deformable elastic body and a coupling member for interconnecting a pair of inner cylinder forming members.

According to a second aspect of the present invention, there is provided the vibration isolator according to the first aspect, wherein the outer member has a plurality of openings, and the elastic member and the pair of inner cylinder forming members are vulcanized and bonded. A pair of inner cylinder forming members are arranged facing each other in a state where there is a gap with the end faces facing each other, and a pair of inner cylinder forming members are inserted while inserting a coupling member into these pair of inner cylinder forming members to eliminate the gap. It is characterized in that the spaces are interconnected.

The operation of the vibration isolator according to claim 1 will be described below. A cylindrical outer member is connected to one of the vibration generating unit and the vibration receiving unit, and a pair of inner cylinder forming members arranged side by side along the axial direction and arranged in the outer member are connected to each other by a connecting member, and the vibration is generated. The pair of inner cylinder forming members are respectively connected to the other of the generating unit and the vibration receiving unit. Further, an elastic body is disposed between the pair of inner cylinder forming members and the outer member while being vulcanized and bonded, and is deformed when vibration occurs.

Therefore, the elastic body is compressed and deformed as the connecting member connects the pair of inner cylinder forming members to each other. In other words, when compressing and deforming the elastic body in order to remove the residual strain of the elastic body at the time of vulcanization bonding and improve the durability of the elastic body, it is not necessary to perform drawing at a large drawing ratio, and Breakage of the adhesive layer between the outer member and deformation or buckling of the drawn outer member does not occur.

Further, unlike the structure for dividing the intermediate cylinder, the outer member serving as the intermediate cylinder is not divided, so that there is no difficulty in drawing the intermediate cylinder and there is no deviation in the direction perpendicular to the axial direction. Does not occur. For this reason, in a vibration damping device containing liquid, an outer cylinder is arranged so as to cover the outer member, and the outer cylinder is drawn to seal a liquid chamber filled with liquid, but the sealing performance may be deteriorated. Disappears.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same effect as the first embodiment. However, in the present invention, the outer member has a plurality of openings, and when vulcanizing and bonding between the elastic body and the pair of inner cylinder forming members, the inner surfaces of the pair of inner members have a gap with the end faces facing each other. The tube forming members are arranged to face each other, and a pair of inner tube forming members are connected to each other while inserting a coupling member into the pair of inner tube forming members to eliminate a gap.

Therefore, the mold can be inserted and removed from the plurality of openings of the outer member at the time of vulcanization bonding between the elastic body and the pair of inner cylinder forming members. It is possible to arrange the pair of inner cylinder forming members in the outer member so as to face each other while facing each other with a gap.

For this reason, by eliminating the gap between the pair of inner cylinder forming members by the connecting member after the vulcanization bonding, the elastic body is compressed and deformed, and the residual distortion of the elastic body at the time of the vulcanization bonding is removed. It becomes possible to improve the durability of the elastic body.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolator 10 according to an embodiment of the present invention is shown in FIGS. 1 to 7, and the present embodiment will be described with reference to these drawings.

As shown in FIGS. 1 and 2, a mounting frame 14 for forming an outer frame of the vibration isolator 10 according to the present embodiment.
A cylindrical outer tube fitting 16 is inserted and disposed inside the inside, and an intermediate tube 18 which is an outer member formed of a steel plate is fitted to the inner peripheral surface side of the outer tube fitting 16.

As shown in FIG. 2 and FIG.
Has a pair of flange portions 18B at both ends thereof, which are spread to the outer peripheral side and are fitted to the inner peripheral side of the outer cylinder fitting 16,
An intermediate portion of the intermediate cylinder 18 is a small-diameter portion 18A formed in a small-diameter cross-section with a different diameter.

An elastic body 20, which is a main rubber made of rubber, is vulcanized and bonded to the intermediate cylinder 18, and the elastic body 20 is also attached to the outer peripheral surface of the small diameter portion 18A of the intermediate cylinder 18.
Is vulcanized and bonded to have the same outer diameter as the flange portion 18B.

At the center of the elastic body 20, there is disposed an inner cylinder 22 extending parallel to the axis of the intermediate cylinder 18 and formed by a pair of inner cylinder forming members 22A. It is also vulcanized. That is, a pair of inner cylinder forming members 2 is formed of a metal connecting member 28 having a tubular shape and a caulking portion 28A protruding to the outer peripheral side at both ends.
The inner tube fitting 22 is formed by inserting the pair of inner tube forming members 22A into each other and inserting the pair of inner tube forming members 22A into each other.

The inner tube fitting 22A is formed by a pair of inner tube forming members 22A which face each other with their end faces facing each other.
Therefore, as shown in FIGS. 2 and 5, the elastic body 20 to be vulcanized and bonded to the inner cylinder 22 is also formed by the pair of elastic body forming members 20B.

When the mounting frame 14 is mounted on the vehicle body and the inner tube fitting 22 is connected to the engine by bolts or the like,
The load of the engine is supported by the vehicle body via the inner cylinder 22, the elastic body 20, the intermediate cylinder 18, the outer cylinder 16, and the mounting frame 14.

On the other hand, concave portions 24 and 26 are formed in the elastic member 20 on the upper and lower sides of the inner cylinder fitting 22, respectively.
A pair of openings 18C and 18D are formed in accordance with 4 and 26. Also, the intermediate cylinder 1 corresponding to the upper concave portion 26
An arc-shaped partition member 30 is arranged between the small-diameter portion 18 </ b> A of FIG. Further, a space between the concave portion 26 of the elastic body 20 and the partition member 30 is defined as one pressure receiving liquid chamber 34, and a space between the concave portion 24 of the elastic body 20 and the inner peripheral surface of the outer cylinder 16 is the other. Pressure receiving liquid chamber 32
It has been.

A hole 30B penetrating through the partition member 30 is formed in a leftward portion of the partition member 30 in FIG. 1, and the hole 30B is formed outside the partition member 30 as shown in FIG. A groove 30 </ b> C extending in a U-shape from the left end of the partition member 30 to the left end of the partition member 30 is formed.

A groove 38 extending along the circumferential direction of the small diameter portion 18A is formed at a position corresponding to the end of the groove 30C of the covering rubber 20A arranged on the outer peripheral surface of the small diameter portion 18A of the intermediate cylinder 18. I have. The hole 30B, the groove 30C, and the groove 38 form a first restriction passage 56, and the first restriction passage 56 allows the pair of pressure receiving liquid chambers 3 to be formed.
Communication is made between 2, 34.

Further, a through hole 42 extending in the left-right direction in FIG. 1 is formed in the partition member 30. As shown in FIG. 1, one end of the through hole 42 is bent downward to form the small diameter portion 18A. Is connected to the pressure-receiving liquid chamber 32 through a groove 40 formed in the covering rubber 20A on the outer peripheral side of the intermediate cylinder 18 so as to extend along the circumferential direction of the intermediate cylinder 18. This through hole 42
Is bent upward and is connected to a liquid chamber recess 30 </ b> A formed on the outer peripheral surface of the partition member 30. At the position of the outer tube fitting 16 corresponding to the liquid chamber recess 30A, a through hole 5 is provided.
4 is formed, and a pipe 44 is attached to a portion of the attachment frame 14 corresponding to the through hole 54.

On the other hand, as shown in FIGS. 1 and 3, a peripheral portion of a diaphragm 50, which is an elastic film made of rubber, is vulcanized and bonded to the distal end side of the block 46 formed in a ring shape. By fitting the block 46 into the liquid chamber recess 30A, the peripheral edge of the diaphragm 50 is sandwiched between the inner wall surface of the liquid chamber recess 30A of the partition member 30 and the block 46.

That is, the space in the block 46 connected to the end of the through hole 42 is partitioned by the diaphragm 50, so that the space in the block 46 near the through hole 42 forms the sub liquid chamber 48. The space between the inner peripheral surface of the outer tube fitting 16 and the diaphragm 50 is an air chamber 52, which allows the diaphragm 50 to be deformed. Then, the second portion is formed by the groove portion 40 and the through hole
Of the pressure receiving liquid chamber 32 and the auxiliary liquid chamber 48 are communicated by the second restricting path 58.

The pair of pressure receiving liquid chambers 32, 34,
A liquid such as water or oil is sealed in the sub liquid chamber 48 and the restriction passages 56 and 58.

On the other hand, a switching valve 72, which is an electromagnetically operated valve, is connected to the pipe 44 via a connecting pipe 70, and an intake manifold 74 on the intake side of the engine and serving as a negative pressure source. Connection pipe 76 connected to
Is connected to the switching valve 72. The switching valve 72 forms a three-port two-position switching valve, and is connected to the air chamber 52 between the negative pressure side communicating with the intake manifold 74 via the connection pipe 76 and the atmosphere side.
The switching valve 72 can switch the zero flow path.

Further, the switching valve 72 is connected to a control circuit 60 which is a control means for switching the switching valve 72 by judging the driving condition of the vehicle. The control circuit 60 is driven by a vehicle power supply, and can detect a vehicle speed and an engine speed by receiving detection signals from at least a vehicle speed sensor 62 and an engine speed sensor 64 for determining a driving state of the vehicle. Thus, the control circuit 60 can determine whether the vehicle is running or stopped.

Therefore, the operation of the switching valve 72 for switching the flow path is controlled by the control circuit 60, and when the switching valve 72 communicates the air chamber 52 with the atmosphere side, the negative pressure by the intake manifold 74 is reduced. Will be shut off.

As a result, as shown in FIG. 1, the diaphragm 50 is located in the middle of the space in the block 46, and the diaphragm 50 can be deformed between the auxiliary liquid chamber 48 and the air chamber 52. , The auxiliary liquid chamber 48 can be expanded and contracted. Therefore, the second restriction passage 58 that connects the pressure receiving liquid chamber 32 and the sub liquid chamber 48 can attenuate the vibration.

When the switching valve 72 communicates the air chamber 52 with the intake manifold 74, the communication with the atmosphere is cut off.

As a result, as shown in FIG. 4, the diaphragm 50 moves to the inner wall surface side of the air chamber 52, and the diaphragm 50 is brought into close contact with the inner peripheral surface of the outer tube fitting 16 so that it cannot be deformed. As a result, the auxiliary liquid chamber 48 cannot be expanded or contracted, and the second restriction passage 58 is substantially closed.

That is, by switching the air flow path by the switching valve 72, the second restriction passage 58 is substantially opened and closed.

In this embodiment, the passage length of the first restriction passage 56 is longer than the passage length of the second restriction passage 58, and the first cross-sectional area of the second restriction passage 58 is larger than that of the second restriction passage 58. The passage cross-sectional area of the restriction passage 56 is smaller.

Next, the assembly and operation of the vibration isolator 10 according to this embodiment will be described. First, an intermediate cylinder 18 having a pair of openings 18C and 18D formed therein and a pair of inner cylinder forming members 22A are mounted in a vulcanization mold (not shown) so as to be capable of being inserted and removed from two directions. At this time, as shown in FIG. 5, the pair of inner cylinder forming members 22A are arranged in the intermediate cylinder 18 so as to be arranged along the axial direction, face each other with a gap therebetween while their end faces face each other. You.

In this state, the elastic body 20 is vulcanized and formed, and as shown in FIGS. 5 and 6, the elastic body 20 is vulcanized and bonded between the intermediate cylinder 18 and the pair of inner cylinder forming members 22A. Is done. For this reason, as shown in FIG. 6, the outer surface of the elastic body 20 along the radial direction is tapered, and the length L ₀ is increased in advance.
Is formed.

After the vulcanization bonding, the connecting member 28 shown in FIG. 6 having a caulking portion 28A only at one end is penetrated into the inner peripheral side of the pair of inner cylinder forming members 22A so as to stab. The gap is eliminated by forcibly pulling the pair of inner cylinder forming members 22A apart from each other. And, as shown in FIG.
By caulking the other end of the coupling member 28 to form a caulked portion 28A at this end, the pair of inner cylinder forming members 22A are fixed to each other, and the pair of inner cylinder forming members 22
A is connected to form the inner cylindrical fitting 22. Thus, the elastic member 20 is shorter than the length L ₀ length L ₁ is the original outer surface in the radial direction of being compressed and deformed elastic member 20, fits into the elastic body 20 defined space in a compact In addition, the residual strain of the elastic body 20 at the time of vulcanization bonding can be removed, and the durability of the elastic body 20 can be improved.

Lastly, the outer cylinder 16 is placed on the outside of the intermediate cylinder 18 and the outer cylinder 16 is drawn in the liquid, so that the liquid is filled in the liquid chambers 32, 34, and 48 while the liquid is filled. The chambers 32, 34, 48 can be sealed.

Therefore, when the elastic body 20 is compressed and deformed in order to remove the residual strain of the elastic body 20 at the time of the vulcanization bonding and to improve the durability of the elastic body 20, the outer cylinder fitting 16 and the intermediate cylinder 18 are used. Does not need to be drawn at a large drawing rate, so that the adhesive layer between the elastic body 20 and the intermediate tube 18 is broken, and the drawn outer tube fitting 16 and the intermediate tube 18 are deformed and buckled. Does not occur.

Further, unlike the structure in which the intermediate cylinder 18 is divided, the outer member serving as the intermediate cylinder 18 is not divided.
There is no difficulty in drawing the intermediate cylinder 18 and no displacement occurs in the direction orthogonal to the axial direction.
For this reason, in the present embodiment, the outer tube fitting 16 is disposed so as to cover the intermediate tube 18, and the liquid chambers 32, 34, and 48 in which the liquid is filled by drawing the outer tube 16 as described above are formed. Although the sealing is performed, there is no fear that the sealing performance is deteriorated.

On the other hand, the vulcanizing mold can be inserted and removed from the pair of openings 18C and 18D of the intermediate cylinder 18 at the time of vulcanization bonding between the elastic body 20 and the intermediate cylinder 18 and the pair of inner cylinder forming members 22A. Therefore, the pair of inner cylinder forming members 22A can be disposed in the intermediate cylinder 18 with the end faces of the pair of inner cylinder forming members 22A facing each other and having a gap during vulcanization bonding. Becomes

Next, the operation of the vibration isolator 10 according to the present embodiment will be described. When the engine of the vehicle (not shown) is started, the pressure in the intake manifold 74 becomes negative.

Accordingly, a pair of inner cylinder fittings 22A formed by connecting a pair of inner cylinder forming members 22A arranged in the intermediate cylinder 18 side by side along the axial direction thereof with a coupling member 28.
When the vibration is transmitted from the engine side, the elastic body 20 which is the main body rubber is deformed, and accordingly, a pair of pressure receiving liquid chambers 3 arranged with the inner cylinder fitting 22 interposed therebetween while communicating with each other.
The liquids 2 and 34 expand and contract, and the liquid flows in the first restriction passage 56 between the pair of pressure receiving liquid chambers 32 and 34. That is, the pair of pressure receiving liquid chambers 32 and 34 are arranged so as to be of a differential type in accordance with the movement of the inner cylinder fitting 22.

Therefore, not only the vibration is attenuated by the deformation of the elastic body 20, but also the vibration is attenuated by the passage resistance of the liquid between the pair of pressure receiving liquid chambers 32, 34, and the outer cylinder 1
Vibration is less likely to be transmitted to the vehicle body connected to the vehicle body 6 via the mounting frame 14.

Further, a second restriction passage 58 is provided in the pressure receiving liquid chamber 32.
The sub-liquid chamber 48 is communicated with the sub-liquid chamber 48, and a part of the partition wall of the sub-liquid chamber 48 is formed so that the diaphragm 50 can be elastically deformed. The air chamber 52 is connected to the sub-liquid chamber 48 with the diaphragm 50 interposed therebetween. It is arranged facing. The switching valve 72 connected to the air chamber 52 and the intake manifold 74 opens and closes a flow path between the air chamber 52 and the intake manifold 74.

Therefore, when vibration having a frequency that cannot be attenuated by the flow of liquid between the pair of pressure receiving liquid chambers 32 and 34 is input, the switching valve 72 is opened and closed to switch the diaphragm 50 to a deformable state. , The second restricted passage 58
The pressure change is transmitted to the diaphragm 50 serving as a partition wall of the sub liquid chamber 48 via the liquid crystal. As the diaphragm 50 elastically deforms, the liquid receives a passage resistance in the second restriction passage 58 or resonates with the liquid column. .

Therefore, when vibration having a frequency that cannot be attenuated by the flow of the liquid between the pair of pressure-receiving liquid chambers 32 and 34 is input, not only the vibration is attenuated by the deformation of the elastic body 20 but also the vibration is attenuated. Vibration is reduced due to the passage resistance of the liquid in the second restriction passage 58 or liquid column resonance or the like, and it becomes difficult for the vibration to be transmitted to the vehicle body connected to the outer tube fitting 16.

The specific operation will be described below. For example, when the vehicle runs, shake vibration occurs. Control circuit 60
Is determined by the vehicle speed sensor 62 and the engine speed sensor 64 to be at the time of occurrence of shake vibration, and the switching valve 72 is switched to bring the inside of the air chamber 52 into a negative pressure state. As a result, as shown in FIG.
6, and the auxiliary liquid chamber 48 cannot be expanded or contracted,
The second restriction passage 58 is substantially closed. Therefore, the liquid actively moves in the first restriction passage 56 and receives a passage resistance in the first restriction passage 56, or the liquid column resonates to absorb the shake vibration.

On the other hand, for example, when the vehicle stops, idle vibration having a high vibration frequency occurs. In this case, the first restriction passage 56 is clogged. At this time, the control circuit 60 controls the vehicle speed sensor 62 and the engine speed sensor 64
It is determined that idle vibration has occurred by the
To make the inside of the air chamber 52 communicate with the atmosphere.

As a result, the inside of the air chamber 52 is brought into an atmospheric state at the same pressure as the atmospheric pressure, and as shown in FIG. 1, the diaphragm 50 is separated from the inner peripheral surface of the outer tube fitting 16 and the auxiliary liquid chamber 48 is opened.
Can be expanded and contracted, and the liquid can move back and forth in the second restriction passage 58. As a result, the second restriction passage 5
The liquid column resonates in the liquid 8, the dynamic spring constant of the vibration isolator 10 is reduced, and the idle vibration is absorbed.

As described above, when the vehicle is running and when it is stopped,
The frequency of the vibration generated by the engine is different from each other, but the pressure in the air chamber 52, which is located opposite to the auxiliary liquid chamber 48 with the diaphragm 50 interposed therebetween, is switched by the switching valve 72 to cope with the frequency difference. it can. As a result, the characteristics of the vibration isolator 10 can be changed depending on whether the air chamber 52 is communicated with the atmosphere side or the intake manifold 74 by the switching valve 72, and the vibration can be absorbed over a wide frequency range.

In the above-described embodiment, the configuration in which the vibration isolator 10 is used as an engine mount has been described. However, the present invention is not limited to this, and the vibration isolator 10 may be a member mount, various bushes, or the like for general industrial machines. Of course, it may be used for support or the like.

In the above-described embodiment, the outer cylinder is connected to the vehicle body serving as the vibration receiving portion, and the inner cylinder is connected to the engine side serving as the vibration generating portion. It is good.

Further, in the above-described embodiment, the description has been made of the vibration isolator having a liquid chamber. However, it is needless to say that the present invention can be applied to a vibration isolator having no liquid chamber.

[0057]

Since the vibration isolator of the present invention has the above-described structure, it has an excellent effect that drawing can be performed without deformation, buckling, displacement or the like of the outer member.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an anti-vibration device according to an embodiment of the present invention, which is a cross-sectional view during idle vibration.

FIG. 2 is a sectional view taken along line 2-2 of the vibration isolator shown in FIG.

FIG. 3 is an exploded perspective view showing a partition member, an intermediate cylinder, an elastic body, a diaphragm, and the like of the vibration isolator according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view of the vibration isolator according to one embodiment of the present invention, showing a cross-sectional view at the time of shake vibration.

FIG. 5 is a cross-sectional view showing an elastic body, an inner cylinder forming member, and an intermediate cylinder, corresponding to line 5-5 in FIG. 1;

6 is a view for explaining insertion of a coupling member into an inner cylinder forming member, and is a cross-sectional view corresponding to line 6-6 in FIG.

FIG. 7 is a diagram illustrating a state in which the coupling member is inserted into the inner cylinder forming member, and is a cross-sectional view corresponding to line 7-7 in FIG.

[Description of Signs] 10 Anti-vibration device 16 Outer tube fitting 18 Intermediate tube 20 Elastic body 22 Inner tube fitting 22A Inner tube forming member

Claims (2)

[Claims] A cylindrical outer member connected to one of the vibration generator and the vibration receiver; and a cylindrical outer member arranged in the outer member along the axial direction and connected to the other of the vibration generator and the vibration receiver. A pair of inner cylinder forming members connected to each other; an elastic body that is disposed between the pair of inner cylinder forming members and the outer member while being vulcanized and deformed when vibration occurs; And a coupling member for coupling to the vibration isolator. 2. The method according to claim 1, wherein the outer member has a plurality of openings, and when the elastic body and the pair of inner cylinder forming members are vulcanized and bonded together, the pair of inner cylinders are formed such that the end faces face each other with a gap. 2. The vibration damping device according to claim 1, wherein the members are arranged to face each other, and a coupling member is inserted into the pair of inner cylinder forming members to interconnect the pair of inner cylinder forming members while eliminating a gap. apparatus.