JPH0968253A - Manufacture of liquid sealing type vibrationproof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing processes in number, and thereby lower manufacturing cost. SOLUTION: In an outer cylinder sealing film 13a of a rubber elastic body 13 formed over the inner circumferential surface of an outer cylinder 11 by cure bonding and the like, a cut-out part 13d is formed in an outer cylinder flange sealing film 13c extended to the opening cylindrical end of the outer cylinder sealing film 13a simultaneously when the rubber elastic body 13 is formed. As a result, when an orifice forming member 20 is housed in an intermediate assembly 10, and the opening cylindrical end is blocked by an elastic cover body 30 in the liquid 40, an orifice passage 22 allows the excess portion of the liquid 40 to be pushed out from a first liquid chamber 51 and a second liquid chamber 52, and excess liquid 41 is thereby discharged outside through the cut-out parts 13d and 13d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid filled type vibration damping device used for vibration damping of, for example, an upper arm or a lower arm of a vehicle suspension mechanism.

[0002]

2. Description of the Related Art Conventionally, as this type of liquid-filled type vibration damping device, a rubber elastic body has been used in order to realize higher vibration damping performance against vibrations of the vehicle body and impact input from the road surface due to higher performance. There is a so-called tubular mount device that effectively suppresses vibration by adapting the vibration damping function of both the liquid and the enclosed fluid such as liquid. As an example, in the liquid-filled tubular mount device disclosed in Japanese Patent Laid-Open No. 4-290628 shown in FIG. 6, the inner tubular metal fitting 1 arranged coaxially is provided.
The liquid chamber forming member 4 and the second rubber elastic body 5, which are referred to as acting members, are sequentially press-fitted and assembled into the apparatus main body in which the outer cylinder metal fitting 2 and the outer tubular metal fitting 2 are integrally connected via the first rubber elastic body 3, and The liquid 6 is enclosed in a liquid chamber formed between each member.

By the way, in preparation for mounting on a vehicle body as an anti-vibration device, it is necessary to seal the liquid 6 in a liquid chamber with an appropriate liquid pressure without excessively pressurizing it. Therefore, when the liquid chamber forming member 4 and the rubber elastic body 5 are press-fitted into the main body of the apparatus, an escape area for the liquid 6 must be secured as the volume of the liquid chamber decreases, and the surplus amount of the liquid 6 must be discharged to the outside of the apparatus. I have to. In order to deal with this, in the tubular mounting device shown in FIG. 6, the through hole 7 is machined and punched in the inner tubular metal fitting 2 at the stage of the component manufacturing process, so that the liquid chamber forming member 4 and Corresponding to a decrease in the volume of the liquid chamber when the second rubber elastic body 5 is press-fitted and a decrease in the volume of the liquid chamber when the outer cylinder metal fitting 1 is pressed from the outside and reduced in diameter, The surplus amount of the fluid 6 is discharged from the through hole 7 to the outside of the device.

[0004]

However, like the conventional cylindrical mount device, the through hole 7 serves as a liquid escape hole for discharging the excess fluid 6 in the liquid chamber to the outside.
Since it is purposely machined and provided on the inner tubular metal fitting 2,
There is an inconvenience that the number of manufacturing steps of the inner tubular metal fitting 2 increases and the cost of the product increases.

An object of the present invention is to reduce the manufacturing process and the cost of parts.

[0006]

In order to achieve the above object, the present invention closes a coaxial outer cylinder and an inner cylinder by coupling one end side in the cylinder axial direction to each other via a rubber elastic body. And an intermediate assembly having the other end side as an opening tube end, an elastic lid mounted on the opening tube end of the intermediate assembly to close the opening tube end, the inner and outer tubes of the intermediate assembly, and the rubber. An annular orifice passage, which is housed in a space surrounded by each of the elastic body and the elastic lid, divides the space into at least two liquid chambers, and communicates the liquid chambers with each other along the outer circumference. The orifice forming member and the elastic lid are sequentially assembled to the intermediate assembly in a state of being immersed in a liquid, while the orifice forming member is provided in the liquid chamber and the orifice passage. To fill the liquid In the method for manufacturing a liquid-filled type vibration damping device, the inner peripheral surface of the outer cylinder is covered with an outer cylinder seal film of a portion formed by extension on the rubber elastic body over the end of the opening cylinder, and the outer cylinder is A notch is formed in the circumferential portion at the opening cylinder end of the seal film, and the excess liquid is removed from the notch by the assembling pressure of the orifice forming member and the elastic lid to the intermediate assembly. The liquid is discharged to the outside of the chamber, and then the opening cylinder end of the outer cylinder is caulked to close the cutout portion of the outer cylinder seal film so that the required amount of the liquid is enclosed in the liquid chamber and the orifice passage. ing.

When a rubber elastic body is molded by vulcanization adhesion or the like on the inner peripheral surface of the outer cylinder by such a manufacturing method, at the same time as the molding, the outer cylinder seal film opening cylinder which is an extension of the rubber elastic body is formed. By previously providing a notch for discharging excess liquid at the end, it is possible to save the labor of machining a through hole in a metal inner cylinder as in the conventional case, and reduce the manufacturing cost to reduce the component cost. You can

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for manufacturing a liquid filled type vibration damping device according to the present invention will be described below with reference to FIGS.

First, as shown in FIG. 1 and FIG. 2, the structure of the apparatus is mainly composed of an intermediate assembly 10, an orifice forming member 20 and an elastic lid 30, and an outer cylinder 11 of the intermediate assembly 10. The upper arm 16 of the suspension mechanism is fixed and supported by the outer peripheral surface of the inner cylinder 12
It is applied to a vibration-damping device that effectively suppresses a road surface impact transmitted through the upper arm 16 and the connecting rod 17 by being supported by a connecting rod 17 that is fitted to the vehicle body, for example, at an appropriate portion. . That is, the vibrations in the XX direction transmitted from the traveling road surface via the upper arm 16 and the resonance action of the liquid 40 such as silicon oil flowing in the orifice passage 22 are damped and absorbed.

As shown in FIGS. 3 and 4, the intermediate assembly 10 supports a metallic outer cylinder 11 and a connecting rod 17 which are fixed to the upper arm 16 coaxially with the axis C-C. The inner cylinder 12 is made of metal, and the inner and outer cylinders 11 and 12 are integrally joined to each other by vulcanizing rubber elastic body 13 or the like.

In this case, the rubber elastic body 13 is molded in an annular shape between the outer cylinder 11 and the inner cylinder 12, has a size occupying almost half of the cylinder length at one end side in the direction of the axis C--C, and has an upper portion. An annular recess 14 is formed in the first liquid chamber 51. In addition, the portion surrounded by the outer cylinder 11 and the inner cylinder 12 above the annular recess 14 is the orifice forming member 20.
Is an annular space portion 15 for housing the. The inner peripheral surface of the outer cylinder 11 and the outer peripheral surface of the inner cylinder 12 facing the space 15 are respectively formed from the inner and outer circumferences of the rubber elastic body 13 and extended upward along the axis C-C, respectively. It is covered with the sealing film 13b.

In the intermediate assembly 10, the other end of the outer cylinder 11 is opened at the upper end in the figure, and a flange portion 11a is projected in a flange shape in a horizontal direction at right angles to the axis C--C, and this flange portion 11a. The caulking part 11b which is launched from the outside of the
And the end of the cylinder is an opening. The flange portion 11a is covered with an outer cylinder flange seal film 13c extending from the outer cylinder seal film 13a of the rubber elastic body 13. As is apparent from FIG. 3, the outer cylinder flange seal film 13c is provided with notches 13d and 13d at two positions in the circumferential direction at a phase angle of, for example, 180 ° simultaneously with the molding of the main body of the rubber elastic body 13. ing.

Next, the orifice forming member 20 is assembled and accommodated in the space 15 of the intermediate assembly 10, and based on a metal ring member 21 having an annular groove 22,
A rubber elastic body 25 is integrally joined along the inner peripheral surface of the ring member 21 by vulcanization adhesion or the like.

In this case, the ring member 21 is the intermediate assembly 1.
_{No. 0} has an outer diameter D ₁ that can be incorporated into the inner peripheral surface of the outer cylinder 11 via the outer cylinder seal film 13a.
It is slightly smaller than the inner diameter d ₁ of the outer cylinder 11 including a, and D ₁ <
It is set as d ₁ . Further, an annular orifice passage 22 having a groove shape in cross section is formed along the outer periphery of the ring member 21. At the outer peripheral edge portion forming the orifice passage 22,
The communication passages 23 and 24 are provided at, for example, two positions with a phase angle of less than 360 ° in the circumferential direction. The orifice passage 22 has an annular recess 14 provided in the rubber elastic body 13 on the intermediate assembly 10 side, that is, the first liquid chamber 51, and an elastic lid described below. The second liquid chamber 52 formed by closing the body 30 is in communication. Therefore, the distance between the communication passages 23 and 24 is the distance between the first liquid chamber 51 and the second liquid chamber 52 via the orifice passage 22. It is preferable that the distance between them is maximized in a range where they do not overlap each other at 360 ° so that the distance between them becomes as long as possible. Communication passage 2
Depending on the distance between 3, 24 the first and second liquid chambers 51,
By setting the distance between 52, it is possible to tune the damping performance adapted to the vehicle type.

In the orifice forming member 20, the upper edge portion of the rubber elastic body 25 is an elastic packing portion 26 having an inner diameter d ₂ which is bent and formed inward so as to be elastically bendable. This elastic packing portion 26 is used for the intermediate assembly 1.
It is in close contact with the outer peripheral surface of the inner cylinder 12 on the 0 side, that is, the outer peripheral surface of the outer diameter D _{2 including} the inner cylinder seal film 13b which is an extension from the rubber elastic body 13 with a required elastic pressure.

Next, the elastic lid 30 is a member which is incorporated in the space 15 of the intermediate assembly 10 to close the open tube end of the outer tube 11. That is, it has two inner and outer ring members 31, 32 made of metal.
Are integrally joined by vulcanization adhesion or the like through the rubber elastic body 33.

In this case, the outer ring member 31 has an inverted L-shaped cross section.
The outer cylinder 11 is formed in a V shape and has an outer diameter D ₃ that can be press-fitted into the inner peripheral surface of the outer cylinder 11 of the intermediate assembly 10 via the outer cylinder seal film 13a, and the inner diameter of the outer cylinder 11 including the outer cylinder seal film 13a. It is slightly smaller than d ₁ and D ₃ <d ₁ . Also, the flange portion 31a, which is the bent portion of the outer ring member 31, is
The flange portion 11a of the outer cylinder 11 is formed in a shape that overlaps from above via an outer cylinder flange seal film 13c that is a portion extending to the opening cylinder end of the rubber elastic body 13. On the other hand, the inner ring member 32 is a straight tube and has an inner diameter d ₃ , and can be fitted to the outer periphery of the joint portion (outer diameter D ₃ ) 12a that is stepped on the upper portion of the inner cylinder 12 in the figure. ing. Also,
The rubber elastic body 33 is formed with a curved surface like a diaphragm shape, and is elastically expandable when a predetermined liquid pressure is applied. As is apparent from FIG. 2, by providing the seal protrusion 33a along the outer periphery of the rubber elastic body 33, the caulking portion 11b of the outer cylinder 11 is placed above the seal protrusion 33a when the assembly shown in FIG. 1 is completed. By closely contacting with each other, the liquid tightness between the outer ring member 31 and the flange portion 31a can be further enhanced.

Here, an example of a method for assembling the above respective members to manufacture an apparatus will be described with reference to FIGS. 2 to 4 together with FIGS. 1 and 5.

First, the intermediate assembly 10 is dipped in a fluid 40 in a liquid tank (not shown), and the space portion 15 of the intermediate assembly 10 is immersed.
To fill the fluid 40. Next, in the fluid 40,
In the first step, the orifice forming member 20 is installed in the space portion 15 from the end of the opening cylinder, and in the second step, the elastic lid body 30 is installed so as to overlap the orifice forming member 20. That is, when the orifice forming member 20 is housed in the space 15 and then closed by the elastic lid 30, the orifice passage 22 of the orifice forming member 20 is connected to the communicating passages 23, 24.
A first liquid chamber 51 and a second liquid chamber 52, which are connected to each other in a circular shape via, are formed, and a state shown in FIG. 5 in which each chamber is filled with the liquid 40 is obtained.

As described above, the orifice forming member 20 and the elastic lid body 30 are sequentially accommodated in the space 15 of the intermediate assembly 10 in the liquid 40, and the outer cylinder 11 is drawn to reduce the diameter to form the orifice. Member 20 and elastic lid 3
The gap between each outer peripheral surface of _{No. 0} and the inner peripheral surface of the outer cylinder 11 on the side of the intermediate assembly 10 (dimension difference such as D ₁ <d ₁ ) is eliminated, and the inner and outer peripheral surfaces of each member are liquid-tightly adhered to each other. Let At this time, as the volume of the space 15 decreases, the first and second liquid chambers 51, 5
In 2, the excess amount of the liquid 40 is pushed out, and the gaps between the outer peripheral surfaces of the orifice forming member 20 and the elastic lid 30 and the outer cylinder seal film 13a covering the inner peripheral surface of the outer cylinder 11 (D shown in FIG. 5).
₁ , D ₃ <d ₁ dimensional difference, etc.), and as shown by an arrow 41 in FIG.
It is ejected to the outside through the cutouts 13d, 13d of 3c. When the excess liquid 41 is discharged to the outside, the liquid 40 in the first and second liquid chambers 51 and 52 is not overpressurized,
The fluid pressure is set to an appropriate level.

After that, as shown in FIG. 1, the caulking portion 11b of the outer cylinder 11 at the opening cylinder end is caulked toward the inside of the cylinder, and is crimped to the flange portion 31a of the outer ring member 31 on the elastic lid 30 side. . That is, the liquid lid type vibration damping device in which the open lid end of the outer barrel 11 of the intermediate assembly 10 is closed by the elastic lid body 30 and the liquid 40 is filled in the first and second liquid chambers 51 and 52 is obtained. .

[0022]

As described above, according to the present invention,
By forming a notch at the same time as molding the rubber elastic body in the circumferential portion of the portion where the outer cylinder seal film of the rubber elastic body covering the inner peripheral surface of the outer cylinder extends to the end of the opening cylinder, this notch It is possible to discharge the excess liquid from the outside to the outside, which saves the labor of mechanically machining the through hole for discharging the excess liquid in the metal inner cylinder like the conventional device of this kind, and the manufacturing process is reduced. It is effective in reducing the component cost.

[Brief description of drawings]

FIG. 1 is an assembly cross-sectional view showing a liquid filled type vibration damping device in which a liquid is filled by caulking in an embodiment of a manufacturing method of the present invention.

FIG. 2 is an exploded cross-sectional view showing a main part of an apparatus including an intermediate assembly, an orifice forming member, and an elastic lid.

FIG. 3 is a plan view of the intermediate assembly.

4 is a cross-sectional view of the intermediate assembly taken along the line AA of FIG.

FIG. 5 is an assembly cross-sectional view showing a state in which an orifice forming member and an elastic lid are sequentially incorporated in an intermediate assembly in a liquid.

FIG. 6 is an assembly cross-sectional view of a liquid-filled tubular mount device shown as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Intermediate assembly 11 ... Outer cylinder 11b ... Caulking portion of outer cylinder 12 ... Inner cylinder 13 ... Rubber elastic body 13a ... Outer cylinder seal film 13b ... Inner cylinder seal film 13c ... Outer cylinder flange seal film 13d ... Notch 20 ... Orifice forming member 23, 24 ... Orifice passage 30 ... Elastic lid 40 ... Liquid 51, 52 ... First and second liquid chambers

Claims (1)

[Claims] 1. An intermediate assembly in which a coaxial outer cylinder and an inner cylinder are connected to each other through a rubber elastic body to close one end side in the cylinder axis direction and to close the other end side with an open cylinder end, An elastic lid that is attached to the open tubular end of the intermediate assembly to close the open tubular end; and a space surrounded by the inner and outer barrels of the intermediate assembly, the rubber elastic body, and the elastic lid. An orifice forming member which is housed to divide the space into at least two liquid chambers and which has an annular orifice passage provided along the outer circumference for communicating the liquid chambers with each other; Manufacture of a liquid-filled type vibration damping device in which the liquid is filled in the liquid chamber and the orifice passage while sequentially assembling the orifice forming member and the elastic lid with respect to the intermediate assembly in the opened state. In the method The inner peripheral surface of the outer cylinder is covered with the outer cylinder seal film of the portion extended and molded in the rubber elastic body over the end of the opening cylinder, and a notch is formed in the circumferential portion of the outer cylinder seal film at the end of the opening cylinder. By forming the orifice forming member and the elastic lid on the intermediate assembly, the excess liquid is discharged from the cutout to the outside of the liquid chamber, and then the open cylinder of the outer cylinder is formed. A method for manufacturing a liquid-filled type vibration damping device, characterized in that a required amount of the liquid is sealed in the liquid chamber and the orifice passage by crimping an end and closing a cutout portion of the outer cylinder sealing film.