JPH083342B2 - Anti-vibration device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vibration isolator that reduces vibrations from a vibration source by the passage resistance of a liquid passing through a restriction passage.

[Prior Art] An anti-vibration device generally called an anti-vibration rubber is used for an engine mount of an automobile or the like so as to absorb the vibration of the automobile engine and prevent the vibration from being transmitted to the vehicle body.

In this anti-vibration device with a liquid chamber inside,
The damping effect based on the viscous resistance when the liquid passes through the orifice improves the vibration damping effect.

As shown in FIG. 6, in this type of vibration damping device 100, an orifice 102, which is a restricted passage, has an upper plate 104 and a lower plate with a hat-shaped cross section.
After abutting 106, the upper plate 104 and the lower plate 106 are joined by a spot solution. That is, the lower plate 10
6 and a concave portion on the outer periphery of the upper end of the tubular portion, and the concave portion and the upper plate 104
An orifice 102 is formed between the inner circumference and the inner circumference. As a result, the upper plate 104 and the lower plate 106 have the upper small liquid chamber 114 and the lower small liquid chamber 1
16 and the small liquid chambers are communicated with each other via only the orifice 102.

The flange portions 104A and 106A formed on the lower portions of the upper plate 104 and the lower plate 106 (lower side in FIG. 6) are in close contact with each other, and the outer peripheral portion 108A of the diaphragm 108 is the upper plate 104 and the lower plate. It is arranged so as to surround the outer peripheral edge of 106.

Therefore, the bent portion 108B of the outer peripheral portion 108A of the diaphragm 108 is
Is abutted against the edge portion 106B of the outer peripheral edge of the lower plate 106, the diaphragm 108 may be damaged by the edge portion 106B of the lower plate 106 at the bent portion of the outer peripheral portion 108A.

Therefore, by making the edge portion 106B of the lower plate 106 into a round shape, it is possible to prevent the diaphragm 108 from being damaged even if the bent portion 108B of the outer peripheral portion 108A of the diaphragm 108 comes into contact with the edge portion 106B of the lower plate 106. be able to.

However, if the edge portion 106B of the lower plate 106 is formed into a round shape, the number of working steps is increased, and there is a problem that the working efficiency is deteriorated and the cost of the product is directly increased.

[Problems to be Solved by the Invention] In consideration of the above facts, an object of the present invention is to provide a vibration damping device in which a diaphragm is not scratched.

[Means for Solving the Problem] In the invention according to claim (1), a pair of small liquid chambers to which vibration is transmitted, and a limiting passage that connects the small liquid chambers to each other is formed between the overlapping portions. The first and second plate members and the periphery are the first
A diaphragm that abuts against the end of the plate member and forms the partition wall of the one small liquid chamber, the end of the first plate against which the diaphragm abuts is bent to form a second
The edge portion of the second plate member is covered to eliminate the contact between the edge of the second plate member and the diaphragm.

In the invention according to claim (2), a pair of small liquid chambers to which vibration is transmitted, an orifice member that forms a limiting passage that communicates the small liquid chambers with each other, and a peripheral portion is a peripheral portion of the orifice member. And a diaphragm that forms a partition wall of the one small liquid chamber, and an elastically deformable movable member is provided in the orifice member, and the movable member is provided between the diaphragm and the orifice member. It is characterized in that a protective plate for limiting the deformation of the body is interposed, and the peripheral portion of the protective plate is bent to cover the edge portion of the orifice member so that the edge portion and the diaphragm are not in contact with each other.

[Operation] In the invention according to claim (1), the restriction passage provided inside the vibration isolator is formed from the first plate member and the second plate member,
Since the end portion of the first plate member is bent so as to cover the edge portion of the end portion of the second plate member, the bent portion of the first plate member facing the diaphragm becomes smooth and damage to the diaphragm can be prevented. .

In the invention according to claim (2), since the edge portion of the orifice member that forms the restricted passage provided inside the vibration isolator is covered with a separately prepared protective plate, the diaphragm is the edge portion of the orifice member. There is no direct contact with and it is possible to prevent damage to the diaphragm.

[First Embodiment] FIG. 1 shows a sectional view of a vibration isolator 10 according to the invention described in claim (1).

This anti-vibration device 10 is used as an engine mount,
A bolt 12 is fixedly hung down to the center of the bottom plate 11 for attachment to a vehicle body (not shown).

A cylindrical connecting plate 14 and a lower end flange portion 14A are bent and caulked and fixed to an outer peripheral portion 11A of the bottom plate 11.
Further, the step portion 11B formed inside the outer peripheral portion 11A of the bottom plate 11 is separated from the lower end flange portion 14A, and is formed of an elastic body between the step portion 11B and the lower end flange portion 14A. A thick portion 16A near the outer periphery of the diaphragm 16 is sandwiched. An air chamber 18 is formed between the middle portion of the bottom plate 11 and the middle portion of the diaphragm 16, and the diaphragm 16
Can be displaced in the expansion / contraction direction of the air chamber 18 (vertical direction in FIG. 1). A through hole (not shown) for communicating the air chamber 18 with the outside air is formed in the bottom plate 11 as needed.

The expanded peripheral portion 14B formed on the upper portion of the connection plate 14 is vulcanized and bonded to the lower end outer peripheral portion of the vibration-absorbing main body 20 made of rubber, which is a molded body having a vertical axis.

A support 22 is vulcanized and adhered to the center of the vibration absorbing body 20, and a bolt 24 is fixed to the center of the support 22 for mounting and fixing an engine (not shown).

A hollow chamber constituted by the connecting plate 14, the diaphragm 16 and the main vibration absorbing stage 20 is a liquid chamber 26, which is filled with a viscous liquid such as silicone oil.

In the liquid chamber 26, an abutting plate 40 as a first plate member and a bracket 28 as a second plate member, which are the constituent members of the orifice.
Is provided to divide the liquid chamber 26 into an upper liquid chamber 26A and a lower liquid chamber 26B.

As shown in FIG. 2, this bracket 28 has a cylindrical shape,
The flange portion 28A extends in the radial direction from the lower end portion (lower side in FIG. 2). The front end of the flange portion 28A is sandwiched and fixed by the connecting plate 14 and the bottom plate 11 (see FIG. 1). The upper end of the bracket 28 is a flat plate top 28B bent in the axial direction. As shown in FIG. 2, a circular hole 3 is formed at the center of the flat plate top 28B.
No. 0 is bored, and a movable body 32 for preventing an increase in the dynamic spring is attached to the circular hole 30 in a state of being movable by a certain amount.

The movable body 32 includes an upper movable body 34 and a lower movable body 36. The upper movable body 34 has an axially intermediate portion 34A having a smaller diameter than the circular hole 30, and a collar portion 34B having a larger diameter than the circular hole 30 is continuous to the top portion. Further, a connecting portion 34C having a diameter smaller than that of the intermediate portion 34A is continuously formed at the lower end portion. As shown in FIG. 2, the lower movable body 36 has a disk shape, and a through hole 38 into which the connecting portion 34C is press-fitted is formed in the central portion, and the connecting portion 34C is press-fit into the through hole 38. By the movable body 34
The lower movable body 36 and the lower movable body 36 are fixed to each other to form the movable body 32. An adhesive or the like may be applied to the connection between the upper movable body 34 and the lower movable body 36, if necessary, to ensure the fixation of both.

As shown in FIG. 1, the movable body 32 has a collar portion 34B arranged in the upper liquid chamber 26A and a lower movable body 36 arranged in the lower liquid chamber 26B.

The intermediate portion 34A of the movable body 32 is formed to be slightly longer than the total thickness of the bracket 28 and the contact plate 40 (first portion).
Drawing dimension L). Therefore, the movable body 32 can be moved up and down by this size difference, and the upper liquid chamber 26A and the lower liquid chamber 26B can be expanded or contracted by a slight amount.

The contact plate 40 is also formed in a tubular shape as shown in FIG. A circular hole 42 having the same diameter as the circular hole 30 of the bracket 28 is formed in the center of the flat plate top portion 40A formed on the upper end of the contact plate 40 for mounting the movable body 32. A flange portion 40B is extended in the radial direction at the lower end portion of the contact plate 40. As shown in FIG. 2, the diameter of the flange portion 40B is larger than the diameter of the flange portion 28A of the bracket 28. As shown in FIG. 1, the outer peripheral portion of the flange portion 40B of the contact plate 40 is bent in a substantially L-shaped cross section so as to cover the outer peripheral edge portion 28E of the flange portion 28A of the bracket 28.

Therefore, the outer periphery of the bent portion of the flange portion 40B is a smooth surface, and as shown in FIG. 1, the thick portion 16A of the diaphragm 16 abuts on the outer periphery of the smoothly bent portion of the flange portion 40B and the flange portion 28A. It does not hit the edge part 24E. Therefore, even if the thick portion 16A of the diaphragm 16 is strongly sandwiched between the outer peripheral portion 11A of the bottom plate 11 and the lower end flange portion 14A of the connection plate 14, the edge portion 24E does not damage it.

As shown in FIG. 2, a concave portion 46 is formed on the outer peripheral portion of the flat plate top portion 40A of the contact plate 40 while leaving a part around the axis of the contact plate 40.

The recess 46 is substantially C-shaped when viewed from the direction of the bracket 28, and an orifice 52, which is a gap, is formed between the recess 46 and the flat plate top 28B of the bracket 28. The orifice 52 is connected to the upper liquid chamber through an oval communication hole 48 formed in the flat plate top portion 28B of the bracket 28 and an oval communication hole 50 formed in a part of the recess 46 of the contact plate 40. 26A and the lower liquid chamber 26B communicate with each other.

 Next, the operation of the first embodiment of the present invention will be described.

When manufacturing the antivibration device 10, the antivibration device is placed in a viscous liquid.
Bottom plate 11, connection plate 14, diaphragm 16 which are the components of 10
Etc., and the bracket 28 crimped to the contact plate 40 is disposed inside the connection plate 14 to which the vibration absorbing main body 20 is vulcanized and adhered.
Next, the diaphragm 16 is brought into contact with the flange portion 40B of the contact plate 40, and the diaphragm 16 is attached to the bottom plate 11 and the connection plate 14.
Sandwich with. Then, the lower end flange portion 14A of the connection plate 14 is caulked to the outer peripheral portion 11A of the bottom plate 11, whereby the bottom plate 11 and the connection plate 14 are caulked and fixed, and the vibration isolator 10 is manufactured.

In this case, as shown in FIG. 1, between the outer peripheral portion 11A of the bottom plate 11 and the lower end flange portion 14A of the connecting plate 14, the flange portion 28A of the bracket 28 and the flange portion 40B of the contact plate 40, as well as the thick portion of the diaphragm 16 are provided. 16A is also pinched and fixed. But,
The flange portion 40B of the contact plate 40 crimped to the outer periphery of the flange portion 28A does not have an edge portion on its outer periphery, and the edge portion 28E of the bracket 28 is covered by the flange portion 40B, so that the diaphragm is in contact. The 16 thick parts 16A are not scratched.

Further, as described above, since the flange portion 40B of the contact plate 40 is caulked and fixed onto the flange portion 28A of the bracket 28 in a bent state, it is possible to more reliably prevent the liquid from oozing out from the orifice 52, so that the sealing performance is improved. Is further improved.

Moreover, since the bracket 28 and the abutment plate 40 are fixed to each other by caulking, the bracket 28 and the abutment plate 40 have a stronger bonding force as compared with joining by spot welding or the like.

The bottom plate 11 of the vibration isolator 10 according to the present invention is fixed to the vehicle body of the automobile through the bolts 12, and the automobile engine is mounted and fixed to the support base 22 by the bolts 24 to complete the assembly.

When installing the engine, the weight of the engine is the bolt
Since it acts on 24, the pressure in the upper liquid chamber 26A rises. This pressure is transmitted to the lower liquid chamber 26B via the orifice 52, and the air chamber 18 contracts.

Vibration generated in the engine when the engine is operating
Transmitted via 22. The vibration absorbing main body 20 can absorb the vibration by the vibration damping function based on the internal friction. When the frequency of vibration is low, the amplitude is large, and when the viscous liquid filled in the upper liquid chamber 26A or the lower liquid chamber 26B moves to the other via the orifice 52, the damping action is based on the viscous resistance and the vibration damping effect. Is being improved.

[Second Embodiment] FIG. 3 shows a second embodiment of the vibration isolator 10 according to the invention described in claim (1).

In this embodiment, an opening 60 is formed in the tubular portion 40C of the contact plate 40 so that the orifice 52 and the lower liquid chamber 26B communicate with each other.

In addition to the flange portion 28A of the bracket 28, the flange portion 40B of the contact plate 40 also caulks the outer peripheral portion of the flange portion 64 of the movable body supporting cylinder 64 arranged outside the bracket 28. Therefore, the flange portion 28A of the bracket 28
The edge 28E is covered with the flange portion 40B of the contact plate 40.

In the movable body support cylinder 64, a tubular portion 64B is in close contact with the outer circumference of the tubular portion of the bracket 28, and an upper end thereof is a reduced diameter portion 64C that is bent upward in the axial direction after protruding above the bracket 28.

The movable body supporting cylinder 64, the cylindrical portion 64B, and the cylindrical portion 2 of the bracket 28, which are substantially opposite to each other with the axis of the opening 60 and the vibration isolator 10 interposed therebetween.
An opening 62 is formed in 8C to connect the upper liquid chamber 26A and the orifice 52. The reduced-diameter portion 64C of the movable body support cylinder 64 is a thick disk-shaped movable body formed of a flexible member such as rubber.
The outer peripheral portion of 66 is vulcanized and connected. This movable body 66 is moved in the axial direction of the vibration isolator 10 by the liquid flowing from the lower liquid chamber 26B and the liquid in the upper liquid chamber 26A through a plurality of through holes 68 formed in the flat plate top portion 28B of the bracket 28 (first (3, vertical direction)
By elastically deforming, the upper liquid chamber 26A and the lower liquid chamber 26B can be slightly expanded and contracted to prevent the dynamic spring from increasing.

[Third Embodiment] FIG. 4 shows a third embodiment of the vibration isolator 10 to which the invention described in claim (2) is applied.

In this embodiment, the upper end 40K of the contact plate 40 forming the orifice 52 is expanded in diameter and abuts the tubular portion 28C of the bracket 28, and the tubular portion 40C and the bracket 28 having a smaller diameter than the upper end 40K.
An orifice 52 is formed between the cylindrical portion 28C and the cylindrical portion 28C.

Further, the flange portion 40B of the contact plate 40 and the flange portion 28A of the bracket 28 are caulked and fixed together by a flange portion 80A of a substantially hat-shaped protection plate 80 disposed inside the contact plate 40. That is, the peripheral edge portion of the flange portion 80A forming the portion near the outer periphery of the protective plate 80 is bent, and this peripheral edge portion is bent and inverted so as to cover the contact plate 40 and the outer periphery of the flange portion of the bracket 28 together.

Therefore, the edge portion 40E of the flange portion 40B of the contact plate 40 is covered by the flange portion 80A of the protection plate 80.

This embodiment differs from the first and second embodiments in that the flange portion 28A of the bracket 28 and the flange portion 40B of the contact plate 40 are swaged by a protective plate 80 which is not a component of the orifice 52. Moreover, as shown in FIG. 4, since the flange portion 80A of the protective plate 80 is smoothly bent,
The outer peripheral portion 16A of the diaphragm 16 that comes into contact with the flange portion 80A of the protection plate 80 is not scratched.

An opening portion 82 is formed in the tubular portion 80B of the protective plate 80 and the tubular portion 40C of the contact plate 40 to connect the lower liquid chamber 26B and the orifice 52.

Further, an opening 84 is also formed in the tubular portion 28C of the bracket 28 on the substantially opposite side with the opening 82 and the shaft center of the vibration isolator 10 sandwiched therebetween, so that the upper liquid chamber 26A and the orifice 52 are communicated with each other. ing.

Inside the bracket 28, the flat plate top 80 of the protective plate 80.
A movable body 86 is arranged above C. This movable body 86
Is formed by covering a core material 88 made of plastic with a cover portion 89 made of a rubber material. The outer peripheral portion 86A of the movable body 86 is clamped and fixed to the bracket 28 and the contact plate 40, and the central portion thereof is elastically deformable in the axial direction of the vibration isolator 10 (vertical direction in FIG. 4).

That is, the movable body 86 is elastically deformed by the liquid flowing from the lower liquid chamber 26B and the liquid in the upper liquid chamber 26A through the plurality of through holes 90 formed in the flat plate top portion 80C of the protective plate 80, and thus the moving spring. It is designed to prevent the increase of

When the movable body 86 is to be largely elastically deformed upward, the elastic deformation is limited by the stopper portion 28D formed in a reduced diameter state on the upper end portion of the bracket 28. When trying to elastically deform downward, the elastic deformation is limited by the flat plate top portion 80C of the protective plate 80.

[Fourth Embodiment] FIG. 5 shows a fourth embodiment of the vibration isolator 10 to which the invention described in claim (2) is applied.

The orifice 52 is an orifice member 92 having a substantially J-shaped vertical section.
And the inner peripheral surface of the vibration absorbing main body 20.

The outer peripheral surface of the top plate portion 92A of the orifice member 92 is in contact with the connection plate 14 via the vibration absorbing main body 20. This top plate 92A
A lower part 92B hangs from the bottom in the direction of the bottom plate 11. From the lower end of the rising portion 92B, the holding portion is parallel to the top plate portion 92A.
92C is extended in the radial direction. The tip portion of the sandwiching portion 92C is provided with the outer peripheral portion 16A of the diaphragm 16, the flange portion 80A of the protective plate 80, the lower flange portion 14A of the connecting plate 14 and the step portion of the bottom plate 11.
It is sandwiched between 11B and.

A protective plate 80 is disposed on the lower part 92B of the orifice member 92 and the holding part 92C on the diaphragm 16 side, and the tubular state 80B of the protective plate 80 is provided on the lower part 92B and the flange of the protective plate 80 is provided on the holding part 92C. The portion 80A is in contact. Moreover, the flange portion 80A of the protective plate 80 is bent along the outer peripheral surface of the holding portion 92C of the orifice member 92 so as to cover the edge portion 92E of the holding portion 92C.

Therefore, since the thick portion 16A of the diaphragm 16 does not come into contact with the edge portion 92E of the sandwiching portion 92C of the orifice member 92, the thick portion 16A of the diaphragm 16 is not damaged.

In this embodiment, the orifice 52 is an orifice member.
Since 92 is pressed against the vibration absorbing main body 20,
It is not necessary to use two plate materials as in the first to third embodiments, and the number of parts forming the orifice 52 can be reduced.

[Effects of the Invention] As described above, in the vibration isolator according to the present invention, since the end of the plate portion with which the diaphragm abuts is smoothly bent,
This has the effect of preventing damage to the diaphragm and improving the durability of the vibration isolation device.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show a first embodiment of a vibration isolator according to the present invention. FIG. 1 is a longitudinal sectional view of the vibration isolator, and FIG. 2 is an exploded perspective view of an orifice. 3 and 4 are longitudinal sectional views of a vibration isolator showing a second embodiment of the vibration isolator according to the present invention, and FIG. 4 is a vibration isolator showing a third embodiment of the vibration isolator according to the present invention. Longitudinal section,
FIG. 5 is a partially cutaway vertical sectional view showing a fourth embodiment of the vibration damping device according to the present invention, and FIG. 6 is a vertical sectional view showing a conventional vibration damping device. 10 …… Anti-vibration device, 16 …… Diaphragm, 28 …… Bracket (second plate material), 40 …… Contact plate (first plate material), 52 …… Orifice, 80 …… Protective plate.

Claims (2)

[Claims] 1. A pair of small liquid chambers to which vibration is transmitted, first and second plate members forming a limiting passage for communicating the small liquid chambers between overlapping portions, and the first plate member having a periphery. A diaphragm that abuts against the end of the second liquid chamber to form the partition wall of the one small liquid chamber, and bends the end of the first plate to which the diaphragm abuts to end the second plate. A vibration-damping device, characterized in that the edge portion of the second plate member is covered to eliminate contact between the end portion of the second plate member and the diaphragm. 2. A pair of small liquid chambers to which vibrations are transmitted, an orifice member that forms a limiting passage that connects the small liquid chambers to each other, and a peripheral portion is arranged in the peripheral portion of the orifice member. In a vibration control device including a diaphragm forming a partition wall of one small liquid chamber, an orifice member has a movable body that is elastically deformable, and deformation of the movable body is limited between the diaphragm and the orifice member. An anti-vibration device, characterized in that a protective plate is interposed, and a peripheral edge portion of the protective plate is bent to cover an edge portion of the orifice member to eliminate contact between the edge portion and the diaphragm.