JP2001032875A - Liquid sealing type vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid sealing type vibration control device furnished with a lower side fixture easy to manufacture and high in reliability. SOLUTION: Connecting flange parts 18, 19 are formed by making a cylindrical fitting 14 to internally insert a partition body 7 out of a lower side fixture 3 of a vibration control device 1 in a two-piece divided structure in the vertical direction, molding each of divided fittings 16, 17 by drawing it separately and bending contacting parts of each of the divided fittings 16, 17 inside in the radial direction, and these connecting flange parts 18, 19 are connected to each other by welding or caulking and fixing. As dividing fittings can be properly selected in accordance with demanding characteristics and loading height, and accordingly, it is possible to reduce cost by using parts in common.

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 mainly used for supporting a vibration generator such as an automobile engine.

[0002]

2. Description of the Related Art As a liquid-filled type vibration damping device such as an engine mount for supporting the vibration of a vibration generator such as an automobile engine so as not to be transmitted to the vehicle body side, an upper mounting bracket mounted on the engine side and a mounting member mounted on the vehicle body side. And a liquid chamber formed between the vibration-proof base and the diaphragm on the side of the lower mounting bracket. A partition body for partitioning into a liquid chamber and a sub-liquid chamber, and an orifice formed in the partition body to communicate the main liquid chamber and the sub-liquid chamber. Vibration damping due to the liquid flow effect of both liquid chambers by the orifice. There has been known one that exerts a function and a vibration insulating function by a vibration-proof base.

[0003] The lower mounting bracket of the above liquid filled type vibration damping device is
The upper and lower sides are expanded and the middle body part is drawn and formed, and the bottomed cylindrical metal part is crimped and fastened. The minimum diameter of the cylindrical body part The upper end of the partition body inserted into the body portion is abutted against the liquid chamber side peripheral surface of the vibration isolating base, and the lower end is fastened together with the diaphragm to the caulking fastening portion of the cylindrical metal fitting in the height direction. Has been positioned.

[0004]

The cylindrical body of the lower mounting bracket is a cylindrical body whose upper and lower ends are expanded and the intermediate body is formed by drawing. However, the size of the orifice formed in the partition body is also limited, which affects the vibration damping characteristics. In addition, a drawing die for a cylindrical body metal fitting tends to be expensive.

[0005]

Means for Solving the Problems The present inventors have paid attention to the above problems, and have reviewed and studied the structure of the cylindrical lower mounting bracket. It has been found that if the metal shell is divided into two parts in the vertical direction, it is only necessary to draw and form each of the divided metal parts separately, and the drawing height, plate thickness, and material can be set freely and inexpensively. Was.

[0006] In addition, if the joining portion of each split metal fitting is bent inward in the radial direction to form a joining flange, and the joining flanges are joined to each other, joining can be easily performed. The joining means of the split metal fitting is not particularly limited, and welding or swaging can be exemplified.

The arrangement of the joining flange can be set as appropriate in the height direction of the vibration isolating base. The upper side of the joining flange is the main rubber portion of the vibration isolating base, and the lower side of the joining flange is the peripheral wall of the liquid chamber. It is preferable to form a liquid chamber rubber portion that is formed and serves as an insertion portion of the partition body. Furthermore, if the partitioning body is brought into contact with the lower liquid chamber rubber portion of the joining flange, there is no need to take a compression allowance due to the pressure contact of the partitioning body with the main body rubber portion, and the distortion of the liquid chamber R portion with which the partitioning body comes into contact. And the positioning and fixing of the partition body can be easily and stably secured.

[0008] In this case, the structure and material of the partition body are not particularly limited, and either metal or resin can be used as the material, and any one of a one-piece structure and a vertically divided structure can be used. Further, the number of orifices formed in the partition body may be singular or plural (for example, two). For example, a partition body in which a second diaphragm is bonded to a central portion of an aluminum casting body having a first orifice formed on an outer peripheral portion, and a second orifice is formed in cooperation with the second diaphragm. No.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is a sectional view of a liquid filled type vibration damping device, and FIG. 2 is a perspective view of a partition.
The liquid filling type vibration damping device 1 according to the present embodiment includes an upper mounting bracket 2 attached to a vibration generator such as an engine.
A lower mounting member 3 attached to the vehicle body; a vibration-proof base 4 made of a rubber-like elastic body that connects the two mounting members 2 and 3 to each other; A first diaphragm 6 that is disposed on the third side and forms a liquid chamber 5 with the vibration-proof base 4, a partition 7 that divides the liquid chamber 5 into a main liquid chamber 5 a and a sub liquid chamber 5 b, The two orifices 8 and 9 formed in the partition 7 are provided so that the two orifices 8 and 9 exhibit a vibration damping function in different frequency ranges and a vibration isolating function of the vibration isolating base 4. I have.

The upper mounting bracket 2 is formed in a flat plate shape, and has a mounting bolt 10 projecting upward at the center thereof and supporting an engine or the like. In addition, on the upper surface of the upper mounting bracket 2, a base end of a stopper metal fitting 11 (stabilizer metal fitting) having a T-shaped cross section that protrudes laterally from the upper side to absorb a large displacement is positioned and fixed by a screw 12. I have.

The lower mounting member 3 has a bottomed cylindrical metal member 13 having an expanded outer flange 13a at the upper end and a mounting bolt 15 fixed to the vehicle body at the bottom, and an outer flange 13a. The lower end is formed from a cylindrical body fitting 14 fastened from the outside.

The cylindrical body 14 is vertically divided into two parts by a body which is the minimum diameter part, and is composed of an upper part 16 and a lower part 17. Joining flange portions 18 and 19 bent inward in the radial direction are formed, and the joining flange portions 18 and 19 are welded to each other.

The upper end of the upper split metal member 16 is tapered outwardly, and a stopper flange 20 is formed at a part of the upper end of the expanded portion 16a so as to face the tip of the stopper metal member 11. I have.

At the lower end of the lower metal fitting 17, a fastening flange 17a is expanded. Between the fastening flange 17a and the outer flange 13a of the bottomed cylindrical metal fitting 13, a first diaphragm 6 and The outer peripheral portion of the lower partition member 31 of the partition body 7 is sandwiched. A fastening portion 23 extends from the tip of the fastening flange 17a.
Is formed into a U-shaped cross section by inserting the outer flange 13a of the bottomed cylindrical metal fitting 13 therein and caulking so as to surround it from the outside.

Each of the joining flanges 18 and 19 is connected to the split fitting 1.
6 and 17 are bent inward at substantially right angles from the ends of the first orifice 8 on the outer peripheral side.
Is set to substantially the same length as the cross-sectional width of the partition member 7, and also plays a role of a reinforcing bracket for preventing the partition member 7 from being displaced upward.

Each of these split metal fittings 16 and 17 is formed into a cylindrical body by forming a body portion by drawing, forming joint flanges 18 and 19 by press forming or the like, and welding and fixing the both. 14 is completed. The dimensions of each of the split brackets 16 and 17 may be appropriately selected according to the required characteristics and the mounting height.

The vibration-isolating substrate 4 is formed by forming a rubber-like elastic body into an umbrella shape, and is vulcanized and bonded to the upper fitting 2 and the lower fitting 3. Specifically, a rubber-like elastic body is vulcanized and bonded between the lower surface of the upper mounting member 2 and the inner surface of the cylindrical body member 14,
Further, a thin rubber-like elastic body is vulcanized and bonded to a range including the joining flanges 18 and 19 and the inner surface of the lower metal fitting 17. The rubbery elastic body above the joining flanges 18 and 19 constitutes a main rubber portion, and
A rubber-like elastic body lower than 19 constitutes a liquid chamber rubber portion 24 into which the partition body 7 is inserted. This joining flange 18, 1
The upper surface of the outer periphery of the partition 7 is in contact with the lower thin film rubber portion 9 for positioning in the upward direction.

Further, the rubber-like elastic body is made of a cylindrical body fitting 16.
The stopper flange 20 is extended to a position facing the inner surface of the distal end of the stopper fitting 11, and the extended portion is a large displacement absorbing stopper 25. The stopper portion 25 includes a stopper flange 20 and a stopper fitting 11.
Reinforcing metal fittings 26 are buried therebetween.

The first diaphragm 6 has a flexible rubber-like elastic film, and has an annular diaphragm fitting 2 around its outer periphery.
The metal fitting 28 is mounted on the outer flange 13 a of the bottomed cylindrical metal fitting 13. This first
The space surrounded by the diaphragm 6, the lower surface of the vibration isolating base 4, and the liquid chamber rubber portion 24 is the liquid chamber 5, and the partition 7 is arranged so as to partition the liquid chamber 5 up and down.

As shown in FIGS. 1 and 2, the partitioning body 7 includes an upper partitioning member 30, a lower partitioning member 31, and a rubber-like member 32.
The outer peripheral end of the lower partition member 31 extends radially outward, and the extended portion 31a is caulked and fixed to the fastening portion 16 of the lower mounting bracket 3, while the upper partition The outer peripheral edge of the upper end of the member 30 is pressed against the lower rubber portions of the joining flanges 18 and 19, and the partition 7 is positioned.

The upper partitioning member 30 is an annular molded product made of aluminum, and has a first orifice groove 33 having a U-shaped cross section which is opened in a peripheral side surface thereof and is formed substantially in the circumferential direction. Top wall 38 and rubber member 32
A second orifice groove 40 having an open U-shaped cross section is formed by the peripheral wall 39 of FIG.

The first orifice groove 33 and the liquid chamber rubber portion 24 of the vibration isolation base 4 are located inside the first orifice groove 33.
Is defined as a first orifice 8. The first orifice groove 33 has a main liquid chamber side entrance / exit 34 formed in the upper end wall thereof, and a communication hole 35 communicating with the sub liquid chamber side is formed in the lower end wall thereof. A vertical partition wall (not shown) for preventing a short circuit between the side entrance 34 and the communication hole 35 is formed so as to close the first orifice groove 33.

The rubber-like member 32 is made of rubber or resin elastomer, and has an annular peripheral wall 39 forming a second orifice groove 40 with the upper partition plate member 30.
And a flexible thin film-shaped second diaphragm 41 formed in an arcuate concave shape on the inner side of the main liquid chamber on the inner side of the main body, and is integrally vulcanized. 30 is vulcanized and bonded to the inner surface of the ceiling wall 38.

The lower ends of the peripheral walls of the upper partition member 30 and the rubber member 32 are pressed against the lower partition member 31 so that the second orifice groove 40 is closed, so that the space is formed in the second orifice groove.
Orifice 9. The second orifice 9
By the opening 42 formed in the peripheral wall 39 of the rubber member 32,
The second sub-liquid chamber 5c, which is surrounded by the second diaphragm 41 and the lower partition member 31, communicates with the second sub-liquid chamber 5c.
The opening 43 formed in the first sub-liquid chamber 5b communicates with the first sub-liquid chamber 5b. The second orifice groove 40 has a second auxiliary liquid chamber side opening 42 and a first auxiliary liquid chamber side opening 4 of the peripheral wall 39.
3 is provided with a rubber-like vertical wall (not shown) for preventing a short circuit between the first and third rubber members.

The lower partition member 31 is a disk-shaped flat plate made of metal, and has a function of closing the second orifice groove 40 of the rubber member 32 from the lower side inside the upper partition member 30. And the upper partition member 30
The lower end wall of the first orifice groove 33 is formed so as to be in contact with the lower surface and press it upward, and the outer peripheral portion thereof communicates with the communication hole 35 of the first orifice groove 33. Thus, an opening 44 that opens to the first sub liquid chamber 5b is formed. The outer peripheral side of the lower partition member 31 is extended and caulked and fixed to the fastening portion 23 of the lower mounting member 3.

The liquid-filled type vibration damping device 1 comprises a split fitting 1
An assembly formed by vulcanizing and bonding a cylindrical body fitting 14 and the upper mounting fitting 2 to each other by welding and fixing the upper and lower mounting fittings 2 and 17 in a liquid, by opening the lower opening of the cylindrical body fitting 14 in the liquid. The upper partition member 30 to which the rubber-like member 32 has been vulcanized and adhered is set upward with the air inside removed.
The outer peripheral edge of the upper end is joined to the joining flange 1 along the rubber portion 24 of the liquid chamber.
8. Press in until it reaches the lower rubber part. From above, the lower partitioning member 31 and the first diaphragm 6 are press-fitted or inserted into the fastening portion 23, taken out into the atmosphere and adjusted for residual liquid, and then the bottomed cylindrical metal fitting 13 is attached to the fastening portion 23. If these flanges 13a are fitted and caulked and fixed,
Assembly is completed.

In the liquid-filled type vibration damping device 1, since the cylindrical body 14 into which the partition 7 is inserted has a vertically divided structure, each divided metal 16 and 17 can be formed by drawing separately. In addition, the drawing height, plate thickness, and material can be set freely, and can be set at low cost by using common components. Further, since the partition 7 is brought into contact with the lower liquid chamber rubber portion of the thin film of the joining flanges 18 and 19, there is no need to take a compression allowance due to the pressure contact of the partition 7 with the main rubber portion of the vibration-proof base 4. In addition, the distortion of the liquid chamber R at the outer peripheral edge with which the partition 7 contacts can be reduced, and the positioning and fixing of the partition 7 can be performed easily and stably.

[Second Embodiment] FIG. 3 is a sectional view showing a cylindrical fitting of a vibration isolator according to a second embodiment. As shown in the figure, in the present embodiment, as a joining means of the split metal fittings 16 and 17 of the cylindrical metal fitting 14, a method of caulking and fixing both is adopted.

That is, in the present embodiment, the inner end of the lower joining flange 19 is bent upward, and the bent portion 46 clamps the joining flange 18 of the upper split metal fitting 16 so as to sandwich it. As in the first embodiment, the dimensions of the divided bodies 16 and 17 can be appropriately selected according to the required characteristics and the mounting height, and the cost can be reduced by using common components. Other configurations and operations are the same as those of the first embodiment.

[0030]

As is apparent from the above description, according to the present invention, among the lower mounting brackets connected by the vibration isolating base, the cylindrical fitting into which the partition body is inserted has a vertically divided structure of two parts. Each split bracket can be drawn separately,
The drawing height, plate thickness, and material can be freely set, and the contacting portion of each split metal fitting is bent inward in the radial direction to form a joining flange portion, so that joining can be easily performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a liquid-filled type vibration damping device showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the partition body.

FIG. 3 is a sectional view of a cylindrical metal fitting showing a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid-filled vibration isolator 2 Upper mounting bracket 3 Lower mounting bracket 4 Vibration-proof base 5 Liquid chamber 5a Main liquid chamber 5b Sub liquid chamber 6 First diaphragm 7 Partitioning body 13 Bottom cylindrical metal fitting 14 Cylindrical metal fitting 16 Upper split bracket 17 Lower split bracket 18, 19 Joint flange

Claims (6)

[Claims] An upper mounting bracket and a cylindrical lower mounting bracket are connected by a vibration-proof base made of a rubber-like elastic body, and are formed between the vibration-proof base and the diaphragm on the lower mounting-bracket side. A liquid-filled type vibration damping device provided with a partition for partitioning a liquid chamber into a main liquid chamber and a sub-liquid chamber, wherein, among the lower mounting brackets, a cylindrical body fitting for inserting the partition is provided, It is divided into two in the up-down direction, and a joining flange bent inward in the radial direction is formed at the contacting portion of both divided fittings,
A liquid filling type vibration damping device in which the joining flanges are joined to each other. 2. The liquid filling type vibration damping device according to claim 1, wherein said joining flange is joined by welding. 3. The liquid filled type vibration damping device according to claim 1, wherein said joining flange is joined by caulking. 4. A liquid chamber that forms a main rubber portion of the vibration isolating base above the joining flange, forms a peripheral wall of the liquid chamber below the joining flange portion, and serves as an insertion portion of the partition body. 4. The liquid-filled vibration damping device according to claim 1, wherein the rubber portion is constituted. 5. The liquid filling type vibration damping device according to claim 4, wherein said partition member is in contact with a lower liquid chamber rubber portion of said joining flange. 6. The liquid-filled type vibration damping device according to claim 1, wherein two orifices communicating with the main liquid chamber and the sub liquid chamber are formed in the partition body.