JP2914461B2 - Fluid filling method for vibration isolator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling a fluid into a vibration damping device in which fluid is preferably used as an engine mount or a body mount of an automobile.

[0002]

2. Description of the Related Art A chamber surrounded by a rubber elastic body 2 of a main body 1 is partitioned by a partition plate 3 and the outside of the partition plate 3 is covered by a diaphragm 4 to form two fluid chambers A and B which communicate with each other. Lid 5 that covers diaphragm 4 on the outside of diaphragm 4
To form an air chamber 6 in the lid 5 and two fluid chambers A and B.
There is known a vibration isolator in which an incompressible fluid L is sealed (see FIG. 8). The fluid L is sealed in the fluid chambers A and B of such a vibration isolator by setting the partition plate 3, the diaphragm 4, and the lid 5 on a caulking fixture 7 which is vulcanized and bonded to the rubber elastic body 2 of the main body 1. The sealing is performed by caulking the metal fittings 7 in a tank filled with the fluid L when sealing and fixing each of them.

[0003]

When the vibration isolator assembled in the tank filled with the fluid in this way is mounted between the engine 100 and the body 101 as shown in FIG. The rubber elastic body 2 is elastically deformed by the load of the engine 100, the volume of the fluid chamber A is reduced, the fluid L flows through the throttle hole 8 to the fluid chamber B, and the diaphragm 4 is
Swell to the side. That is, regardless of the input of vibration load,
The diaphragm 4 is always in a state where some tension is applied by the expansion of the fluid chamber B based on the compression of the fluid chamber A by the weight of the engine 100 or the like, and is maintained in that state. Therefore, when a vibration load is input, the diaphragm 4 is elastically deformed in the air chamber 6, and the space in which the elastic deformation is possible is limited to the volume in the lid 5. When a static load is applied to the diaphragm 4
Is in a state swelling into the lid 5, the space in the lid 5 cannot be fully utilized, and the air chamber 6 must be enlarged.

[0004] Therefore, the present invention does not allow the diaphragm to bulge toward the lid when a static load is applied, so that the space in the lid can be fully utilized, the stroke of the diaphragm can be increased, and the volume of the air chamber can be increased. If the diaphragm has an air chamber of the same volume as that of the diaphragm bulging toward the lid when receiving a static load, the stroke of the diaphragm can be increased and the vibration absorption performance can be improved. It is an object of the present invention to provide a method of filling a fluid chamber with a fluid in order to manufacture a vibration isolator capable of performing such a process.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a step of injecting a pressurized fluid into an air chamber from an opening formed in a lid and communicating with outside air to press a diaphragm against a partition plate. Filling a predetermined amount of fluid into a chamber surrounded by a rubber elastic body from a hole formed in the main body and communicating with outside air in a state where the diaphragm is pressed against the partition plate;
The method comprises the steps of sealing the hole after filling with the fluid, and stopping the injection of the pressure fluid from the opening after sealing the hole.

[0006]

In the vibration isolator filled with the fluid according to the present invention, the diaphragm is sucked toward the partition plate before being mounted on an engine or the like. When such a vibration isolator is mounted between the engine and the body, a static load of the engine or the like is applied, whereby the rubber elastic body is elastically deformed and the fluid chamber is contracted. Is not biased to the lid side or the partition plate side, and is in a state where a load is not substantially applied. Therefore, even if a vibration load is input in this state, the diaphragm can sufficiently utilize the space in the lid, and as a result, the stroke of the diaphragm increases, and the vibration absorption performance can be improved. Further, according to the method of the present invention, it is not necessary to prepare a tank filled with a fluid as in the prior art, and the fluid can be sealed with a simple device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a main body 1 is formed by vulcanizing and attaching a mounting metal 9 and a caulking metal 7 to a rubber elastic body 2 and forming a chamber R surrounded by the rubber elastic body 2. A hole 10 through which the chamber R communicates with the outside air is formed in the mounting bracket 9. The partition plate 3, the diaphragm 3, and the lid 5 are attached to the main body 1 configured as described above. That is, the partition plate, the diaphragm 3 and the lid 5 are set at the place of the caulking fitting 7, and by caulking the caulking fitting 7, these peripheral edges are sealed and fixed to each other. Such assembling can be performed not in the liquid tank but in the atmosphere, and the diaphragm 4 after assembling hardly receives a load. An opening 11 communicating with the outside air is formed in the lid 5.

After assembling as shown in FIG. 1, an injection pipe 12 is attached to the opening 11 of the lid 5, and a pressure fluid such as air is injected from the compressor C into the air chamber. When the pressure fluid is injected into the air chamber 6, the diaphragm 4 is pressed against the partition plate 3 by the pressure of the pressure fluid.

As shown in FIG. 2, the pressure of the air chamber 6 is maintained to keep the diaphragm 4 pressed against the partition plate 3, so that a fluid such as an incompressible liquid is supplied to the hole 10 as shown in FIG.
A filling tube 13 for injecting into the tube is attached. Then, FIG.
As shown in the figure, a predetermined amount of the fluid L is filled into the chamber R from the filling tube 13. After the fluid L is filled into the chamber R, the hole 10 is sealed with a pin 14. After that, the injection of the pressure fluid into the air chamber 6 is stopped, and the opening 11 communicates with the outside air. When the chamber L is filled with the fluid L in this manner, the diaphragm 4 does not swell into the air chamber 6 of the lid 5 and the partition plate 3
Located on the side.

FIG. 5 and FIG.
An embodiment is shown in which the vacuum pipe 16 and the fluid supply pipe 17 are switched over. In FIG. 5, the air in the chamber R is sucked to be in a vacuum state, so that the diaphragm 4 can be further drawn to the partition plate 3 side. In this state, the pressure of the pressure fluid acting on the air chamber 6 may be reduced. In FIG. 6, the electromagnetic valve 15 switches the hole 10 and the fluid supply pipe 17 so that they communicate with each other.
7 shows a state where a predetermined amount of the fluid L is filled into the chamber R from FIG. Thereafter, the hole 10 is sealed in the same manner as shown in FIG.

As shown in FIG. 7, the vibration isolator filled with the fluid L is connected to the engine 100 and the body 10 as shown in FIG.
When the rubber elastic body 2 is mounted between the
The fluid L is elastically deformed by a static load such as 00, and the fluid L flows into the fluid chamber B between the partition plate 3 and the diaphragm 4 via the throttle hole 8. In this state, the diaphragm 4 is in a state where almost no load is applied. When a vibration load is input from this state, the diaphragm 4 is elastically deformed in the air chamber 6 formed in the lid 5. Since the diaphragm 4 is not bulged toward the lid 5, the space in the air chamber 6 is effectively used, the stroke of the diaphragm 4 is increased, and the vibration absorbing performance is improved.

[0012]

As described above, according to the present invention, a step of injecting a pressurized fluid into an air chamber from an opening formed in a lid and communicating with outside air to press a diaphragm against a partition plate, and a step of partitioning the diaphragm A step of filling the chamber surrounded by the rubber elastic body with a predetermined amount of fluid from a hole formed in the main body and communicating with outside air in a state of being pressed against the plate, a step of sealing the hole after filling the fluid, and a step of sealing the hole And stopping the injection of the pressure fluid from the opening, so that the fluid can be reliably and easily filled with a small device. In the vibration isolator filled with the fluid in this manner, it is possible to prevent the diaphragm from expanding toward the air chamber when a static load is applied, and as a result, the stroke of the diaphragm in the air chamber is increased, and vibration is absorbed. Performance can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view after assembly before filling with a fluid.

FIG. 2 is a cross-sectional view when a pressure fluid is injected into an air chamber.

FIG. 3 is a cross-sectional view of a state in which a chamber is ready for fluid filling.

FIG. 4 is a sectional view showing a state in which a hole is sealed after a chamber is filled with a fluid.

FIG. 5 is a cross-sectional view of a state in which air in a room is evacuated after filling with a fluid.

FIG. 6 is a cross-sectional view of a state where a fluid is filled in a chamber in a vacuum state.

FIG. 7 is a sectional view of a mounted state of a vibration isolator filled with a fluid.

FIG. 8 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body part 2 Rubber elastic body 3 Partition plate 4 Diaphragm 5 Lid 6 Air chamber 10 Hole 11 Opening R chamber L Fluid

Claims (1)

(57) [Claims] 1. A lid which partitions a chamber surrounded by a rubber elastic body of a main body with a partition plate, forms two fluid chambers which communicate with each other by covering the outside of the partition plate with a diaphragm, and covers the diaphragm outside the diaphragm. In a method of filling a vibration isolator with the inside of the lid as an air chamber by attaching a fluid, a step of injecting a pressure fluid into the air chamber from an opening formed in the lid and communicating with outside air, and pressing the diaphragm against the partition plate, A step of filling the chamber surrounded by the rubber elastic body with a predetermined amount of fluid from a hole formed in the main body and communicating with the outside air in a state where the diaphragm is pressed against the partition plate, and a step of sealing the hole after filling the fluid, Stopping the injection of the pressurized fluid from the opening after sealing the hole.