JP3212050B2 - Liquid filled type vibration damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled type vibration damping device, and more particularly to a diaphragm for expanding and contracting a liquid chamber, and an air chamber provided between the diaphragm and the diaphragm to cover the diaphragm. The present invention relates to a liquid-filled vibration damping device having a lid to be formed and a caulking device for fixing the diaphragm and the lid.

[0002]

2. Description of the Related Art As a vibration isolator used in automobiles, general industrial machines, and the like, there is a liquid filled type vibration isolator as shown in FIG.

[0003] The vibration isolator 110 has a bottom plate 112 attached to the vibration receiving portion side, and a cylindrical elastic body 116 is vulcanized and bonded to the center of the upper surface of the bottom plate 112. The inside of the elastic body 116 is a liquid chamber 134.

A plate 118 is vulcanized and bonded to the upper portion of the elastic body 116, and a large diameter hole 126 is formed in the center of the plate 118. As shown in FIG. 5, a part of the elastic body 116 has a hole 126 on the upper surface side of the plate 118.
Is extended in a thin shape as an annular seal portion 116A at the edge portion.

[0005] As shown in FIG.
A flange portion 128A of a partition fitting 128 formed in a deep dish shape with a flange is placed on and is in close contact with. This partition fitting 12
8 is provided with a restriction passage 136 at the center.

As shown in FIG. 4 and FIG.
On the upper side of the diaphragm 28, the diaphragm 1 whose peripheral edge portion is thickened
38 are provided.

[0007] Above the diaphragm 138, a lid 140 connected to the vibration generating section is provided. Lid 140
Is formed by pressing a thick steel plate (plate thickness: 4 mm), and has a dish shape with a central portion protruding in a direction away from the diaphragm 138, and an outer peripheral edge of the flange portion 140A is bent to form a cylindrical portion. 140B are formed.

A ring-shaped caulking member 144 formed of a thin steel plate is disposed radially outside the lid 140. The lower end of the caulking fitting 144 is fixed to the upper surface of the plate 118 by projection welding or the like, and the upper portion is caulked inward in the radial direction.
The outer peripheral edge portion of No. 0 is pinched and fixed.

Here, the peripheral portion 1 of the diaphragm 138
38A and the peripheral edge portion of the partition fitting 128 are connected to the flange portion 140A inside the cylindrical portion 140B and the plate 11
8 and mainly the diaphragm 13
8 seals the liquid by compressing the thick peripheral portion 138A.

[0010]

SUMMARY OF THE INVENTION Such a vibration isolator 1
What is necessary for the reliability of the seal portion 10 is that the processing accuracy (irregularity, surface roughness, etc.) of the portion where the peripheral portion 138A of the diaphragm 138 contacts is good and that the peripheral portion 138A
Is compressed by a predetermined amount.

Incidentally, the lid 140 immediately after being press-formed from a steel plate cannot be used as it is. That is, the lid 140 used in the vibration isolator 110 needs to be processed to remove traces of the press die and unnecessary portions.

More specifically, what is important in the lid 140 is the accuracy of the flange portion 140A with which the peripheral portion 138A of the diaphragm 138 contacts, and the cylindrical portion 140B.
(The height H from the inner surface of the flange portion 140A, see FIG. 5).

However, in order to minimize the size, it is necessary to make the inner corner between the flange portion 140A and the cylindrical portion 140B at a right angle. To this end, a press die is applied to this corner. Must be molded in contact. Therefore, the mark of the press die remains on the lid 140 immediately after the press molding, and the surface is uneven. Irregularities on the surface reduce the sealing performance, and require cutting to remove traces of the press die. In order to compress the peripheral portion 138A of the diaphragm 138 by a predetermined amount (= the thickness dimension t of the peripheral portion 138A of the diaphragm 138-the height dimension H from the inner surface of the flange portion 140A), the flange portion 13 is required.
Since the height dimension H of the cylindrical portion 140B from the inner surface side of 8A is required, cutting of the end portion 140C of the cylindrical portion 140B is required. Thus, the cover 1 of the vibration isolator 110
40 has complicated post-processing after press molding.

The lid 140 has a complicated cross-sectional shape.
Since a thick steel plate is used, deformation such as waving is likely to occur after press molding, and it may take time to perform correction.

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a liquid-filled type vibration damping device that has high reliability of a seal portion and is easy to manufacture.

[0016]

According to the present invention, there is provided a diaphragm forming a part of a partition of a liquid chamber, a supporting member for supporting the diaphragm in close contact with a liquid chamber near an edge of the diaphragm, and A press-molded lid member provided on the side opposite to the liquid chamber side of the diaphragm and in close contact with the liquid chamber side near the edge of the diaphragm to form an air chamber with the diaphragm, A caulking portion which is fixed to the outside of the diaphragm of the support member, abuts against the air chamber side near the edge of the lid member, and clamps and fixes the vicinity of the edge of the diaphragm and the edge of the lid member together with the support member. A liquid filling type vibration isolator provided with a caulking metal fitting, wherein the diaphragm is abutted against the caulking metal fitting near a diaphragm near an edge of the lid member, and the diaphragm is provided between the lid member and the support member. The vicinity of an edge of the ram to a predetermined amount of compression is characterized in that a bent portion forming a gap of a predetermined size for sandwiching.

[0017]

According to the liquid filled type vibration damping device of the present invention, when the diaphragm and the cover member are clamped between the support member and the caulking portion of the caulking device, the diaphragm side near the edge of the cover member bends the caulking device. The liquid chamber can be sealed with high reliability because the vicinity of the edge of the diaphragm is compressed by a predetermined amount.

In addition, since the amount of compression in the vicinity of the edge of the diaphragm is defined by the bent portion of the caulking fitting, the portion of the lid that comes into contact with the edge of the diaphragm is flat (the flat portion of the plate forming the lid member is left as it is). Can be used). That is, the lid member of the liquid-filled type vibration damping device of the present invention does not need to have a complicated shape like the lid member of the conventional liquid-filled type vibration damping device, and the portion of the portion that comes into contact with the edge portion of the diaphragm is not required. Since no cutting is required,
Manufacture is easy and cost can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

The anti-vibration device 10 of this embodiment is used for an automobile as an example, and has a bottom plate 12 attached to a vehicle body which is a vibration receiving portion, as shown in FIG.

The bottom plate 12 is formed of a thick metal plate (in this embodiment, a steel plate having a thickness of 4 mm), and the left side of FIG. 1 is bent obliquely upward on the right side, and the tip end is further bent toward the side-portion elastic body mounting portion.
2B.

At the center of the bottom plate 12, a head of a vehicle body mounting bolt 14 is fixed. On the other hand, a cylindrical elastic body 16 is vulcanized and bonded to the center of the upper surface of the bottom plate 12.

A plate 18 is vulcanized and adhered to the upper part of the elastic body 16, and the left side of the plate 18 in FIG. 1 is formed as a side wall 18A bent downward.
2A at a predetermined interval. A thick side support elastic body 22 is stretched between the side support elastic body mounting portion 12A and the side wall portion 18A, and the side support elastic body 22 Are elastically supported.

The right side of FIG. 1 of the plate 18 is a contact portion 18B which is bent obliquely downward so as to be parallel to the stopper portion 12B at a predetermined interval.

The elastic member 16 has a thin portion extending from the lower end portion covering almost the entire surface of the bottom plate 12, and a portion extending to the stopper portion 12B. The elastic body 16 extending from the stopper portion 12B is slightly thicker for buffering impact. Further, metal rings 24 for adjusting rigidity are embedded in the elastic body 16 at predetermined intervals at an intermediate portion in the axial direction.

As shown in FIG. 1 and FIG.
A large-diameter hole 26 is formed at the center of the plate 18, and a part of the elastic body 16 is thinly extended as an annular seal portion 16 </ b> A at an edge portion of the hole 26 on the upper surface side of the plate 18. I have.

A flange portion 28A of a partitioning metal fitting 28 in the form of a flanged deep dish is placed on and tightly attached to the seal portion 16A. As shown in FIG. 1, a column-shaped restricting passage forming member 30 is fixed to a central portion of the partitioning member 28. The restricting passage forming member 30 has a pressure-receiving liquid chamber 32 and a sub-liquid chamber described later. A restriction passage 36 communicating with the passage 34 extends through the passage.

A diaphragm 38 is provided above the partition fitting 28. The diaphragm 38 has a constant thickness at its central portion and is convex downward. The edge portion 38A of the diaphragm 38 is convex on both sides in the axial direction and is thick.

Above the diaphragm 38, there is provided a lid 40 press-formed from a thick metal plate (in this embodiment, a steel plate having a thickness of 4 mm). The lid 40 has a dish-like shape as a whole, and a central portion is formed so as to protrude in a direction away from the diaphragm 38.
Is fixed. The outer diameter d2 of the lid 40 is formed larger by a predetermined dimension than the outer diameter d1 of the diaphragm 38.

A caulking fitting 44 is disposed radially outside the diaphragm 38 and the lid 40. Caulking fitting 44
Is formed of a thin metal plate (a steel plate having a thickness of 1.6 mm in this embodiment) so that press molding is easy. The caulking fitting 44 includes a cylindrical portion 44A, and a lower portion of the cylindrical portion 44A is bent in a state of protruding radially inward in a substantially U-shaped cross section. It is fixed to the upper surface by projection welding or the like. The bent portion 44B protrudes from the inner peripheral surface of the cylindrical portion 44A by about 1 mm (dimension that the outer peripheral portion of the lid 40 covers).

On the other hand, the upper end portion 44C of the cylindrical portion 44A is bent radially inward, and the upper end portion 44C and the bent portion 44B are bent.
The flange portion 40A of the lid 40 is sandwiched between the first and second portions.

Between the flange 40A of the lid 40 and the seal 16A, a flange 28A of the partition fitting 28 is sandwiched together with a thin portion of the diaphragm 38, and the edge 38A of the diaphragm 38 is connected to the flange 40A. And the plate 18.

The space between the diaphragm 38 and the elastic body 16 is a liquid chamber, in which a liquid such as water, ethylene glycol, silicon oil or the like is sealed.
The sub-liquid chamber 34 is on the side of the diaphragm 8 and the pressure-receiving liquid chamber 32 is on the side of the bottom plate 12.

The space between the diaphragm 38 and the lid 40 is an air chamber 46.
As shown in the figure, the lid 40 communicates with the outside through a hole 48 provided in the lid 40.

Here, as shown in FIG. 3, the dimensions of the vibration isolator 10 are such that the inner diameter φD1 of the bent portion 44B is larger than the inner diameter φD2 of the hole 26 of the plate 18, and the outer diameter of the diaphragm 38. It is almost equal to the dimension d2. The thickness T of the bent portion 44B is smaller than the thickness t of the edge portion 38A of the diaphragm 38 in a no-load state (uncompressed state) by a predetermined dimension.

In the bent portion 44B, adjacent plate members are brought into close contact with each other (that is, the thickness T of the bent portion 44B is
It is preferable that the thickness is twice as large as the plate thickness), but a slight gap may be provided between adjacent plate members.

The manufacturing sequence of the vibration isolator 10 of this embodiment is as follows. First, the plate 18 and the bottom plate 12
Then, the metal ring 24 is set, and the elastic body is integrally vulcanized with them.

Next, a liquid is poured into the concave portion of the elastic body 16, the partition fitting 28, the diaphragm 38, and the lid 40 are sequentially stacked, and the upper end of the caulking fitting 44 is bent inward with the 44C inward (the caulking fitting before caulking). The shape of 44 is shown in FIG. 3), and the vibration isolator 10 is completed.

Next, the operation of this embodiment will be described. In the present embodiment, since the caulking fitting 44 is formed of a thin steel plate, press molding is easy, and springback or the like is unlikely to occur, and dimensional errors after molding are very small. That is, the height dimension of the bent portion 44B is always constant.

For this reason, the lid 40 is brought into close contact with the bent portion 44B, that is, by crimping the cylindrical portion 44A and sandwiching the lid 40 between the bent portion 44B and the upper end of the cylindrical portion 44A, thereby forming the edge portion 38A of the diaphragm 38. Because it can be compressed in a certain amount, the reliability of the seal is high. Further, since the thin portions of the seal portion 16A and the diaphragm 38 can be compressed by a predetermined amount, the sealing performance can be further improved.

The lid 40 according to the present embodiment is provided with the flange 4
0A is flat, and the cover 140 of the conventional vibration isolator 110
Since there is no cylindrical portion 140B (see FIG. 5),
Molding is easy, and deformation such as waving due to spring back or the like after press molding hardly occurs. Further, the shape of the press die for molding the lid 40 is simplified as compared with the conventional case.

Further, the lid 40 of the present embodiment has an end 140 which is required in the lid 140 of the conventional vibration isolator 110.
Since cutting of C and the diaphragm contact surface (flange portion 140A) is not required, manufacture is easy and cost reduction of the vibration isolator 10 can be achieved.

Further, since the lid 40 of the present embodiment does not have the cylindrical portion 140B provided in the lid 140 of the conventional vibration damping device 110, the diameter of the lid 40 is reduced (in this embodiment, the cylindrical portion of the conventional lid is used). 8mm, twice the size of 140A thickness 4mm
(A value obtained by subtracting the protrusion dimension 2 mm of the bent portion 44B from the above, which is smaller by about 6 mm), and the weight can be reduced.

Along with this, the cylindrical portion 4 of the caulking fitting 44
Since the outer diameter of 4A can be reduced,
It is possible to increase the welding area of the lower end portion of 4, and it is also possible to increase the welding strength of the caulking fitting 44.

In this embodiment, the size of the lid 40 and the caulking fitting 44 is reduced, so that less material is used, and the weight of the vibration isolator 10 can be reduced by about 15 grams.

In the vibration isolator 10 of this embodiment, when vibration is input, the liquid resonates in the restriction passage 36 to generate a large damping force, so that transmission of the vibration can be effectively cut off.

[0047]

As described above, the liquid-filled type vibration damping device of the present invention has an excellent effect that the reliability of the sealing portion is high and the manufacturing is easy.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along an axis of a vibration isolator according to one embodiment of the present invention.

FIG. 2 is a plan view of the vibration isolator shown in FIG.

FIG. 3 is a cross-sectional view showing a main part around a caulking fitting of the vibration isolator shown in FIG.

FIG. 4 is a sectional view taken along an axis of a conventional vibration isolator.

5 is a cross-sectional view showing a main part around a caulking fitting of the conventional vibration isolator shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 18 Plate (support member) 32 Pressure receiving liquid chamber 34 Secondary liquid chamber 38 Diaphragm 40 Cover 44 Caulking metal fitting 46 Air chamber 44C Upper end part (caulking part) 44B Bent part

Claims (1)

(57) [Claims] A diaphragm that forms a part of a partition of the liquid chamber; a support member that supports the diaphragm in close contact with a liquid chamber near an edge of the diaphragm; and a diaphragm that is opposite to the liquid chamber of the diaphragm. And a press-molded lid member that is in close contact with the liquid chamber side near the edge of the diaphragm to form an air chamber between the diaphragm and the support member, and is fixed to the outside of the diaphragm of the support member. And a caulking fitting having a caulking portion that abuts on the air chamber side near the edge of the lid member to pinch and fix the vicinity of the edge of the diaphragm and the edge of the lid member together with the support member. In the liquid filled type vibration damping device, the caulking fitting is brought into contact with a diaphragm side near an edge of the lid member, and a predetermined portion near an edge of the diaphragm is provided between the lid member and the support member. Compressed fluid filled type vibration damping device, characterized in that a bent portion forming a gap of a predetermined size for sandwiching it.