JPH09229128A - Manufacture of vibration control device of fluid enclosure type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the enclosed liquid amount to a proper value without mechanical processing of a communication hole, etc., for exhausting surplus liquid. SOLUTION: In a liquid tank 26, an orifice forming member 2 is inserted into a body part 1, and a lid member 3 is press fitted by Process B. A rubber resilient piece 17 of this lid 3 is pressed through a jig 28, and surplus liquid is extruded from the contacting surface at the periphery - Process C. An outer cylinder 6 is contracted in the diameter while the pressed condition by the jig 28 is held, and the gap between the lid 3 and outer cylinder 6 is sealed - Process D. Upon removing the jig 28, the outer cylinder 6 is squeezed into the specified diameter as Process E, and finally the opening edge 6a is caulked as Process F.

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 fluid filled type vibration damping device provided at a connecting portion such as an upper arm or a lower arm in a suspension mechanism of an automobile.

[0002]

2. Description of the Related Art For example, a substantially cylindrical vibration isolator is provided at a joint of various link members such as a lower arm in a suspension mechanism of an automobile to prevent transmission of vibration to a vehicle body. In recent years, in order to improve the vibration isolation performance of this type of vibration isolation device, while forming a plurality of liquid chambers inside a rubber elastic body inserted between the inner cylinder and the outer cylinder,
Various fluid-filled type vibration damping devices have been proposed in which the liquid chambers are communicated with each other by an orifice passage and the vibration effect is reduced by utilizing the resonance action of the liquid enclosed therein.

Conventionally, in manufacturing such a fluid filled type vibration damping device, a method of assembling each member in a liquid and surely filling the inside with the liquid has been adopted. Here, when fixing the lid member to the end portion of the cylindrical outer cylinder and finally sealing the inside of the vibration isolator, so-called drawing processing in which the outer cylinder is pressed to reduce the diameter Therefore, when the assembly is completed, the pressure of the liquid sealed inside increases excessively as the volume of the inside decreases, and a predetermined characteristic cannot be obtained.

FIG. 4 shows a method of manufacturing a conventional fluid filled type vibration damping device disclosed in Japanese Patent Laid-Open No. 4-290628. The fluid filled type vibration damping device is roughly composed of three elements, namely, a main body portion 41, an orifice forming member 42 and a lid member 43. The main body 41 is formed by connecting a metal inner cylinder 44 and a metal outer cylinder 45 with a rubber elastic body 46. As shown in the figure, the rubber elastic body 46 is provided at one end in the axial direction. And the other end is open. Then, in the liquid, the orifice forming member 42 is inserted into the outer cylinder 45, and the lid member 43 is press-fitted. The lid member 43 has an inner circumference side ring 47 fitted to the outer circumference of the inner cylinder 44 and an outer circumference side ring 48 fitted to the inner circumference of the outer cylinder 45, and both the rings 47, 48 are made of a rubber elastic body 50. Are integrated by. The lid member 4
After press-fitting 3 into the inner cylinder 44, the outer cylinder 45 is pressed to the inner peripheral side to reduce the diameter, and the opening edge 45a is bent inward so that the lid member 43 is firmly fixed. ing.

Here, a communication hole 49 is previously formed through a predetermined position of the inner cylinder 44. This communication hole 49 is
It is at a position where it can be closed by the tip of the inner ring 47 of the lid member 43, and excess liquid is discharged during assembly through this communication hole 49. That is, when the inner peripheral ring 47 of the lid member 43 is press-fitted into the inner cylinder 44, the communication hole 49 is left slightly open, and the diameter of the outer cylinder 45 is reduced in that state, and finally, The circumferential ring 47 is pushed axially to the limit position. As a result, the outer cylinder 4
The internal pressure rise due to the reduction of the diameter of 5 can be avoided, and an appropriate amount of liquid can be enclosed inside.

[0006]

However, in the above-mentioned conventional manufacturing method, it is necessary to machine the communicating hole 49 at a predetermined position of the inner cylinder 44 along the radial direction in order to discharge the excess liquid at the time of assembly. Therefore, there is a problem that the number of processing steps of the inner cylinder 44 increases. Further, in order to completely prevent the internal pressure rise, when the inner peripheral ring 47 is pushed in the axial direction, the communication hole 49 is arranged so as to be completely closed at the final stage, that is, at the limit position. However, it is difficult to seal the communication hole 49.

An object of the present invention is to provide a fluid filled type vibration damping device capable of avoiding an increase in internal pressure without processing a communication hole or the like for discharging excess liquid which is unnecessary in a final product. It is to provide a manufacturing method.

[0008]

The fluid filled type vibration damping device manufactured by the method of the present invention is generally composed of three elements. That is, the metal inner cylinder and the metal outer cylinder,
The main body part, which is connected through a rubber elastic body located at one end part in the axial direction, and has the other end opening, and the main body part is inserted into the main body part through the opening and is in the circumferential direction between the outer cylinder. An annular orifice forming member that forms an orifice passage along the inner cylinder, a metal inner ring that fits on the outer circumference of the end of the inner cylinder, and a metal outer circumference that fits on the inner circumference of the end of the outer cylinder. And a lid member that is coupled to the ring via an annular rubber elastic body and that is attached to the opening end of the main body portion to close the opening.

Then, in the manufacturing method of the present invention, the step of inserting the orifice forming member into the body portion in liquid and pressing the lid member into the inner cylinder to cover the opening of the body portion, The rubber elastic body of the lid member or the main body is pressed inward through the tool to deform the rubber elastic body, and the surplus from the inside is passed through the contact surface between the main body and the outer ring of the lid. The step of extruding the liquid, the step of pressing the outer cylinder to the inner peripheral side to reduce the diameter while being pressed by the jig, and bringing the outer peripheral ring and the outer cylinder into close contact with each other in a liquid-tight state; After the pressing by the tool is released, the outer cylinder is further pressed toward the inner peripheral side to reduce the diameter to a predetermined diameter.

That is, when the lid member is assembled to the main body, the inner ring of the lid member is pressed into the inner cylinder, but the outer ring is not pressed into the outer cylinder. Therefore, the excess liquid is discharged from the inside by pressing a part of the rubber elastic body inward with the jig.
As a result, the amount of liquid remaining inside is adjusted to a predetermined amount. Then, the outer peripheral ring and the outer cylinder are brought into close contact with each other in a liquid-tight state while the pressing state of the jig is maintained, so that the inside is sealed while being filled with a predetermined amount of liquid. After that, if the pressing by the jig is released and the outer cylinder is reduced to a predetermined diameter, the lid member is firmly fixed. At the same time, the pressure of the liquid inside becomes appropriate, and the parts of the rubber elastic body are not deformed by the liquid pressure inside.

According to the second aspect of the invention, the jig has a cylindrical shape and presses the rubber elastic body of the shaft member along the axial direction of the outer cylinder. In general, the rubber elastic body of the lid member is made thinner than the rubber elastic body of the main body portion, so by pressing the rubber elastic body of the lid member over the entire circumference,
A predetermined amount of volume change can be easily obtained.

Further, in the manufacturing method of claim 3, a seal lip made of rubber is provided on the outer peripheral surface of the outer peripheral side ring of the lid member over the entire circumference, and before the diameter of the outer cylinder is reduced. Has a slight gap between the seal lip and the inner peripheral surface of the outer cylinder. By providing the seal lip in this way, a liquid-tight state can be surely obtained in the first step of reducing the diameter of the outer cylinder, and invasion of air bubbles into the inside can be prevented.

Further, in the manufacturing method of claim 4, the outer peripheral side ring has a tubular portion overlapping the inner peripheral surface of the outer cylinder, and a flange portion overlapping the flange portion of the opening edge of the outer cylinder. The seal lip is provided on the outer peripheral surface of the tubular portion.

[0014]

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

FIG. 1 is a process explanatory view showing each process of the manufacturing method according to the present invention. 2 shows the configuration of each component before being assembled, and FIG. 3 shows the finally completed fluid filled type vibration damping device.

First, the construction of the fluid filled type vibration damping device in this embodiment will be described with reference to FIGS. As shown in FIG. 2, this vibration isolator is roughly composed of three parts: a main body portion 1, an orifice forming member 2, and a lid member 3. These three parts are individually manufactured through a process not shown.

The main body 1 comprises a metal inner cylinder 5 and a metal outer cylinder 6 concentrically arranged so as to surround the inner cylinder 5.
And a rubber elastic body 7 in which both are combined. The inner cylinder 5 is attached to one shaft member in a suspension mechanism or the like, has a thick wall as shown in the drawing, and has sufficient rigidity. The outer cylinder 6 is made thinner than the inner cylinder 5 so that the later-described drawing (diameter reduction) can be performed. In addition, the opening edge 6a
Are formed to have a slightly larger diameter, and are continuous via a flange portion 6b along a plane orthogonal to the central axis. The rubber elastic body 7 is located between the outer cylinder 6 and the inner cylinder 5 at one end in the axial direction so that the other end of the main body 1 is open. Further, as a part of the rubber elastic body 7, a rubber layer 7a that covers the outer peripheral surface of the inner cylinder 5 to a predetermined position in the axial direction is provided. The rubber elastic body 7 is partially formed with a slit 9 so that the inner peripheral portion 7b can be elastically deformed relatively easily. In addition, 8
Is a ring-shaped reinforcing metal fitting arranged inside the rubber elastic body 7 and also serving as a stopper.

The orifice forming member 2 is housed inside the main body 1 and has a ring-shaped metal ring member 10 as a main body, and a rubber layer 12 is provided on the inner peripheral surface thereof. The ring member 10 has a substantially U-shaped cross section so as to have a concave groove 11 opening toward the outer peripheral side. In the final product, the groove 11 forms an orifice passage 23 along the circumferential direction with the outer cylinder 6, as shown in FIG. An annular seal lip 13 continuous with the rubber layer 12 is provided on the inner peripheral side of the orifice forming member 2. The seal lip 13 is, in the assembled state, the outer peripheral surface of the inner cylinder 5, more specifically, the rubber layer 7.
It is pressed against the outer peripheral surface of a and separates the first liquid chamber 21 and the second liquid chamber 22 as shown in FIG. In addition, ring-shaped continuous seal lips 14a and 14b are also provided on both side edges of the ring member 10 that contacts the inner peripheral surface of the outer cylinder 6, respectively. The orifice lips 23 are reliably sealed from the liquid chambers 21 and 22 by these seal lips 14a and 14b. Each of the liquid chambers 21 and 22 is provided with an orifice passage 2 through a pair of notch portions (not shown) formed in the ring member 10.
It communicates with 3 respectively.

A lid member 3 for closing the opening of the main body 1
Has an inner ring 15 made of metal that fits on the outer circumference of the inner cylinder 5, and an outer ring 16 made of metal that fits on the inner circumference of the end of the outer cylinder 6, and both are annular. Rubber elastic body 1
Bound by 7. The inner ring 15 is
It has a cylindrical shape having an inner diameter slightly smaller than the outer diameter of the inner cylinder 5. The outer peripheral ring 16 includes a cylindrical tubular portion 16 a that overlaps the inner peripheral surface of the outer cylinder 6 and a flange portion 6 of the outer cylinder 6.
It has a flange portion 16b overlapping with b and has a substantially L-shaped cross section. The rubber elastic body 17 is vulcanized and bonded to each of the rings 15 and 16, and between the rings 15 and 16,
It is formed in a relatively thin film shape. Further, a seal lip 18 for sealing between the outer cylinder 6 and the outer cylinder 6 is provided on the outer peripheral surface of the cylindrical portion 16a of the outer peripheral ring 16 over the entire circumference. The seal lip 18 is formed continuously with the rubber elastic body 17. Here, as shown in FIG. 2, in the state before assembly, in order to prevent the tubular portion 16a from tightly fitting with the outer tube 6, the seal lip 1
The inner diameter D2 of the outer cylinder 6 is set to be slightly larger than the outer diameter D1 of 8.

Next, the manufacturing method of the present invention will be described in order of steps with reference to FIG.

First, in step A, the above-mentioned main body 1
The orifice forming member 2 and the lid member 3 are aligned concentrically.

Next, as shown as step B, a liquid tank 2 filled with a liquid such as ethylene glycol to be sealed inside.
6, each component is submerged, and the orifice forming component 2 is inserted into the main body 1 in the liquid, and the lid member 3
Is fixed to the inner cylinder 5. That is, only the inner peripheral side ring 15 is press-fitted as indicated by the arrow F through the plunger 27 corresponding to the inner peripheral side ring 15. At this time, the outer ring 16
The seal lip 18 of the outer cylinder 6 has the inner diameter D as described above.
Since the diameter is smaller than 2, the seal lip 18 and the outer cylinder 6
A slight gap 29 is secured between the inner peripheral surface and the inner peripheral surface.
The gap 29 is about 0.2 mm to 0.5 mm on one side.

Next, in step C, the entire main body 1 and the like are taken out of the liquid tank 26, and the amount of enclosed liquid is adjusted. That is, using the jig 28 having a cylindrical tip,
The rubber elastic body 17 of the lid member 3 is pressed inward and deformed by a predetermined amount. As a result, the pressure inside the main body 1 increases, so that excess liquid is pushed out to the outside through the gap 29 and the contact surface between the flange portions 6b and 16b, as indicated by arrow L. The rubber elastic body 17 of the lid member 3
If the rigidity of the outer peripheral side ring 16 and the rigidity of the outer peripheral side ring 16 are excessively high, the internal pressure causes the main body portion 1 to flow before the excess liquid is pushed out.
Since the inner peripheral portion 7b of the rubber elastic body 7 on the side may be deformed, the rigidity of each portion is set so that the inner peripheral portion 7b is not deformed.

The tip of the jig 28 is the outer ring 1
6 has a thickness substantially corresponding to the interval between the inner ring 6 and the inner ring 15, and has a substantially semicircular cross-sectional shape, so that the rubber elastic body 17 can be smoothly deformed without being damaged. It has become.

Next, in step D, the outer cylinder 6 is subjected to primary drawing while the pressing state of the jig 28 is maintained. That is, the outer cylinder 6 is pressed toward the inner peripheral side as shown by the arrow F, and the diameter is reduced until it is pressed against the seal lip 18 of the outer peripheral ring 16. As a result, the space between the outer peripheral ring 16 of the lid member 3 and the outer cylinder 6 is sealed in a liquid-tight state. Therefore, the inside of the main body 1 in which the liquid is sealed is sealed. The primary throttle increases the pressure of the liquid inside and slightly deforms the inner peripheral portion 7b of the rubber elastic body 7. However, since the internal volume change due to the primary throttle is relatively small, the inner peripheral portion is relatively small. There is no fear that 7b will be excessively deformed and broken.

In the next step E, the outer cylinder 6 is subjected to secondary drawing with the jig 28 removed. That is, the outer cylinder 6
Is further pressurized to the inner peripheral side as indicated by arrow F to reduce the diameter to a predetermined diameter. As a result, the outer cylinder 6 and the outer peripheral ring 16 are more firmly fixed. Further, the rubber elastic body 17, which has been depressed by the jig 28, returns to a predetermined cross-sectional shape (a state similar to a free state) as the diameter of the outer cylinder 6 is reduced. In other words, the pushing amount of the jig 28 in the process C is set so that the internal volume and the enclosed liquid amount become equal at the stage when the secondary restriction is completed. At the moment when the jig 28 is removed, the internal pressure temporarily decreases, but in the primary throttle of the process D, the space between the outer cylinder 6 and the outer peripheral ring 16 is kept liquid-tight. Therefore, there is no possibility that air will enter the inside. In addition, at the stage where the secondary drawing of the outer cylinder 6 is performed as described above, the seal lips 14a, 14 on the outer periphery of the orifice forming member 2 have the outer cylinder 6
The first liquid chamber 21, the second liquid chamber 22 and the orifice passage 23 are separated from each other by being pressed against the inner peripheral surface as described above.

After performing the secondary drawing in step E, the process proceeds to step F, and the opening end edge 6a of the outer cylinder 6 is bent toward the inner peripheral side,
The vibration isolator is completed by caulking.

As described above, in the above-mentioned manufacturing method, since the rubber elastic body 17 is simply deformed to push out the surplus liquid, it is not necessary to process a special communicating hole for discharging the liquid. Moreover, a special seal structure for the communication hole is unnecessary.

Further, by drawing the outer cylinder 6 in two stages of the primary drawing (process D) and the secondary drawing (process E), the pressure rise of the liquid inside can be minimized and the rubber can be minimized. It is possible to prevent breakage of the elastic body 7 due to excessive deformation. Moreover, the rubber elastic body 17 of the lid member 3 having a relatively thin wall is attached to the jig 28.
The rubber elastic body 1 presses evenly over the entire circumference.
It is possible to discharge a predetermined amount of liquid without excessively deforming 7.

[0030]

As is apparent from the above description, according to the method of manufacturing the fluid filled type vibration damping device of the present invention, the amount of the liquid filled inside can be adjusted to an appropriate amount, and the internal pressure rises. Therefore, the rubber elastic body is not deteriorated with time.
In particular, unlike the conventional case, it is not necessary to machine the communication hole for discharging the excess liquid, the processing of each member can be simplified, and a complicated seal structure is not required.

Further, since the diameter reduction process of the outer cylinder is performed in two steps, it is possible to suppress the excessive deformation of the rubber elastic body due to the reduction of the volume during the process, and to prevent the fracture.

Further, according to the manufacturing method of the second aspect, since the rubber elastic body of the lid member which is thinner than the rubber elastic body on the main body side is pressed over the entire circumference, the volume change of a predetermined amount. Can be easily secured.

[Brief description of drawings]

FIG. 1 is a process explanatory view showing an embodiment of a method for manufacturing a fluid filled type vibration damping device according to the present invention.

FIG. 2 is a sectional view of the fluid filled type vibration damping device according to this embodiment before assembly.

FIG. 3 is a sectional view of the fluid filled type vibration damping device in a completed state.

FIG. 4 is a cross-sectional view showing a conventional method for manufacturing a fluid filled type vibration damping device before assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main body part 2 ... Orifice forming member 3 ... Lid member 7 ... Rubber elastic body 15 ... Inner peripheral side ring 16 ... Outer peripheral side ring 17 ... Rubber elastic body 18 ... Seal lip 28 ... Jig 29 ... Gap

Claims (4)

[Claims] 1. A main body formed by connecting a metal inner cylinder and a metal outer cylinder via a rubber elastic body located at one end in the axial direction and having the other end opened, and the main body. An annular orifice forming member that is inserted into the inside of the portion from the opening and that forms an orifice passage along the circumferential direction with the outer cylinder, and a metal inner circumference that fits to the outer circumference of the end portion of the inner cylinder. A side ring and an outer ring made of metal that fits on the inner circumference of the end of the outer cylinder are connected via an annular rubber elastic body, and are attached to the open end of the main body to close the opening. A method of manufacturing a fluid filled type vibration damping device comprising: a lid member, wherein the orifice forming member is inserted into the main body portion in a liquid, and the lid member is press-fitted into the inner cylinder. The process of covering the opening and the cover member or the main body A step of pressing a part of the elastic body inward, deforming the rubber elastic body, and pushing out excess liquid from the inside through the contact surface between the main body and the outer peripheral ring of the lid member; In the pressed state, the outer cylinder is pressed to the inner peripheral side to reduce the diameter, and the outer peripheral ring and the outer cylinder are brought into close contact with each other in a liquid-tight state; and after the pressing by the jig is released, A method of manufacturing a fluid filled type vibration damping device, comprising the step of further applying pressure to the inner peripheral side to reduce the diameter to a predetermined diameter. 2. The method for manufacturing a fluid filled type vibration damping device according to claim 1, wherein the jig has a cylindrical shape, and the rubber elastic body of the lid member is pressed along the axial direction of the outer cylinder. . 3. The outer peripheral surface of the outer peripheral ring of the lid member,
A seal lip made of rubber is provided over the entire circumference, and a small gap is provided between the seal lip and the inner peripheral surface of the outer cylinder before the diameter of the outer cylinder is reduced. A method for manufacturing the fluid filled type vibration damping device according to claim 1. 4. The outer peripheral ring has a tubular portion that overlaps an inner peripheral surface of the outer cylinder, and a flange portion that overlaps a flange portion of an opening edge of the outer cylinder. 4. The method for manufacturing a fluid filled type vibration damping device according to claim 3, wherein a seal lip is provided.