JPH11159566A - Manufacture of fluid-sealed type vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate an amount of liquid sealed in a liquid chamber, to a proper value during manufacture. SOLUTION: A partition member 14 and a diaphragm 20 are placed on the opening peripheral edge part 22 of a body 10 in a liquid tank. With the diaphragm 20 held in a prescribed position by a presser jig 80, and a second base plate 28 is pressed by a press jig 70. Through compression deformation of a rubber elastic body 30, surplus liquid is pushed out from a contact part between the diaphragm 20 and the opening peripheral edge part 22 (at a process F). With this compression state, a cover member 24 is placed on the opening peripheral edge part 22 (at a process G) and securely caulked and a gap between the diaphragm 20 and the opening peripheral edge part 22 is sealed.

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 vibration damping device such as an engine mount interposed between an engine of an automobile and a vehicle body.

[0002]

2. Description of the Related Art Conventionally, an engine mount as a fluid-filled vibration isolator is interposed between an engine and a vehicle body of an automobile to reduce the transmission of vibration between the engine and the vehicle body. I have.

As an example, FIG. 6 shows an engine mount described in Japanese Patent Application Laid-Open No. 7-269634. This engine mount has a hollow portion 12 that opens inside at one end.
, A partition member 14 disposed in the cavity 12, a diaphragm 20 that covers the opening 16 of the cavity 12 and separates the liquid chamber 18 in the cavity 12, and a diaphragm 20. And a cover member 24 for fixing the cover member to the opening peripheral portion 22 of the opening portion 16 in a liquid-tight manner.

The main body 10 has a first substrate 26 fixed to the engine side and a second substrate 28 fixed to the vehicle body side opposed to each other in the axial direction.
6, 28 are connected by a rubber elastic body 30. The partition member 14 divides the liquid chamber 18 into a pressure receiving chamber 18a and an equilibrium chamber 18b. The pressure receiving chamber 18a and the equilibrium chamber 18b communicate with each other via an orifice passage 32 provided on an outer peripheral portion of the partition member 14. doing. In addition, a rubber movable plate 34 that can freely move up and down within a predetermined range of displacement is provided at the center of the partition member 14.

In this engine mount, the rubber movable plate 34 can be freely displaced with respect to a high-frequency, small-amplitude vibration input. Therefore, the pressure receiving chamber 18a and the equilibrium chamber 18b communicate with each other as if the rubber movable plate 34 was in communication. As a result, the fluid pressure fluctuation in the pressure receiving chamber 18a is absorbed and reduced. Therefore, the dynamic spring constant is reduced, and transmission of high frequency vibration to the vehicle body is suppressed. In addition, when a vibration input having a low frequency and a large amplitude, which causes a car shake, the rubber movable plate 34 displaced up and down is fixed to the stopper portion of the partition member 14, so that the pressure receiving chamber 18a and the balance chamber 18b are fixed. Are separated from each other and communicate with each other through the orifice passage 32. Therefore, a large vibration damping effect can be obtained with respect to low-frequency vibration due to the resonance effect of the liquid flowing through the orifice passage 32.

Conventionally, in manufacturing such an engine mount, a method of assembling each component in a liquid to reliably fill the inside with the liquid has been adopted. That is, in the liquid, the partition member 14, the diaphragm 20, and the lid member 24 are stacked in this order on the opening peripheral portion 22 of the main body 10. Next, the diaphragm 20 is brought into close contact with the opening peripheral portion 22 in a liquid-tight manner by caulking and fixing the lid member 24 with a caulking bracket 36 previously fixed to the opening peripheral portion 22, and the liquid is sealed in the liquid chamber 18. . The liquid remaining in the space between the diaphragm 20 and the lid member 24 is drained later through a drain hole formed in the lid member 24.

[0007]

When the engine mount thus manufactured is actually assembled between the vehicle body and the engine, the rubber elastic body 30 of the main body 10 is compressed by an axial load from the engine. As a result, the volume of the pressure receiving chamber 18a is substantially reduced. However, since the amount of the liquid sealed in the entire liquid chamber 18 does not change, excess liquid is removed from the pressure receiving chamber 18a to the equilibrium chamber 18b.
Move to. As a result, the diaphragm 20 is deformed so as to protrude outward, so that desired vibration damping characteristics cannot be obtained, and the diaphragm 20 and the cover member 24 are not obtained.
Between the diaphragm 20 and the cover member 2
4 easily interfere with each other, and the durability of the diaphragm 20 deteriorates.

[0008]

SUMMARY OF THE INVENTION In view of the above, the present invention has a rubber elastic body extending in the axial direction, a cavity formed therein, and an opening at one axial end of the cavity. A fluid comprising: a main body formed with an opening; a diaphragm that covers the opening; and a liquid chamber in the cavity; and a lid member that fixes the diaphragm to an opening peripheral edge of the opening in a liquid-tight manner. In the manufacturing method of the sealed type vibration damping device, a step of placing the diaphragm on the peripheral edge of the opening in the liquid, and compressing and deforming the rubber elastic body in the axial direction via a pressing jig, and forming the diaphragm between the peripheral edge of the opening and the diaphragm Through the contact portion, a compression step of pushing out excess liquid from the inside, and fixing the lid member to the opening peripheral portion in a state of being compressed by the pressing jig, thereby bringing the diaphragm and the opening peripheral portion into close contact with each other in a liquid-tight state. With fixing process It is characterized in Rukoto.

At the stage where the diaphragm is mounted on the periphery of the opening, the diaphragm is not fixed to the periphery of the opening.
Therefore, when the rubber elastic body is compressed in the axial direction by the pressing jig, excess liquid is discharged from the liquid chamber through the contact portion between the diaphragm and the peripheral edge of the opening. Thereby, the inside of the liquid chamber is adjusted in advance to a predetermined volume and liquid amount. And
By keeping the diaphragm in close contact with the periphery of the opening in a liquid-tight manner while maintaining the compressed state by the pressing jig, the inside of the liquid chamber having a predetermined volume is sealed while being filled with a predetermined amount of liquid.

That is, assuming a state where the product is actually mounted on a vehicle body or the like, that is, a state where an axial load is applied to the product and the rubber elastic body is compressed and deformed, the liquid amount in the liquid chamber is adjusted at a manufacturing stage. doing. Therefore, in a state immediately after the compression state by the pressing jig is released, a restoring stress in the extension direction acts on the rubber elastic body, so that the liquid chamber is in a negative pressure state. In this case, the liquid chamber is substantially in a state where no internal pressure is applied.

Further, in the above-described compression step, if the diaphragm is held at a predetermined position using a holding jig, the liquid in the liquid chamber is drained to the outside during the compression step. In addition, the diaphragm does not float or displace.

According to a third aspect of the present invention, the main body portion includes a first substrate fixed to one of an engine side and a vehicle body side, a second substrate fixed to the other side, and a rubber. A reinforcing ring extending radially from the outer periphery of the elastic body, and both substrates are connected by the rubber elastic body, and in the compression step, a fixing jig for fixing the main body is provided by the rubber Pressing the second substrate toward the opening using the pressing jig in a state fitted between the first substrate provided on the opening and the reinforcing ring so as to surround the outer periphery of the elastic body. It is characterized by doing.

[0013]

According to the method of manufacturing the fluid filled type vibration damping device according to the present invention, the product is used in a state where it is assembled to a vehicle or the like, that is, in a state where the product is subjected to an axial load, The amount of liquid sealed in the liquid chamber during manufacturing can be adjusted to an appropriate amount, and desired characteristics can be obtained easily and accurately.

Further, since the volume of the liquid in the liquid chamber becomes excessive due to the reduction of the volume of the liquid chamber due to the compression deformation of the rubber elastic body as in the prior art, there is no possibility that the diaphragm is deformed. It is avoided and the durability of the diaphragm is improved.

Further, according to the second aspect of the present invention, the diaphragm is held at a predetermined position by the pressing jig during the compression stroke, so that the diaphragm does not rise or displace, and the volume and the volume of the liquid chamber are reduced. The liquid volume can be more appropriately adjusted.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for manufacturing a fluid-filled type vibration damping device according to the present invention will be described below in detail with reference to the drawings.

FIGS. 2 to 4 are process explanatory diagrams showing the respective steps of the method of manufacturing the fluid filled type vibration damping device according to one embodiment of the present invention. FIG. 1 shows the configuration of each part before being assembled, and FIG. 5 shows a finally completed fluid-filled type vibration damping device.

First, with reference to FIGS. 1 and 5, the structure of a fluid-filled type vibration damping device according to the present embodiment will be described by assigning the same reference numerals to the same components as in the conventional example shown in FIG. I do.

This anti-vibration device is an engine mount interposed between a vehicle body and an engine, and has a main body in which a hollow portion 12 opened at one axial end (upper side in FIGS. 1 and 5) is formed. Part 10 and partition member 1 arranged in cavity 12
4, a diaphragm 20 that covers the opening 16 of the cavity 12 and separates the liquid chamber 18 in the cavity 12, and a lid member 24 that fixes the diaphragm 20 to the opening peripheral edge 22 of the opening 16 in a liquid-tight manner. , Are roughly composed of four parts. These four parts are individually manufactured through processes not shown.

The main body 10 is disposed at one end in the axial direction and is fixed to, for example, the engine side.
And the bolt 38 disposed on the other end side (the lower side in FIGS. 1 and 5).
Second substrate 2 fixed to, for example, the vehicle body via
8 are connected by a rubber elastic body 30 extending in the axial direction.

The first substrate 26 has a larger diameter than the main body 10, and has a hollow portion 1 at the center protruding toward the main body 10.
2 is formed with a shaft hole 26a which forms a part thereof. The partition member 14, the diaphragm 20, and the lid member 2 are provided on the upper surface of the first substrate 26 which forms a part of the opening peripheral portion 22.
A caulking bracket 36 for caulking and fixing 4 is firmly fixed in advance.

The rubber elastic body 30 has a substantially cylindrical shape with a bottom, and two reinforcing rings 40 projecting in the radial direction are disposed on the outer periphery thereof at appropriate intervals in the axial direction.
The reinforcing ring 40 and the substrates 26 and 28 are vulcanized and bonded to the rubber elastic body 30. In the present embodiment, the first substrate 26 is fixed to the engine. However, for example, the cover member 24 may be thickened and fixed to the engine.

The partition member 14 has a structure including two metal plates 42 and 44 which are overlapped with each other, and a rubber movable plate 34 which is incorporated in a central opening of the two metal plates 42 and 44. Are divided into a pressure receiving chamber 18a and an equilibrium chamber 18b. The pressure receiving chamber 18a and the equilibrium chamber 18b
Two orifice passages 46 formed through the peripheral walls of the metal plates 42 and 44 communicate with each other.

The rubber movable plate 34 has a convex lens shape with its central portion bulging, and its outer peripheral end is sandwiched between the supporting portions of the metal plates 42 and 44. The inner peripheral ends of the metal plates 42 and 44 are formed in a tapered shape with a slight margin with respect to the surface of the peripheral edge of the movable rubber plate 34, and a stopper for restricting the displacement of the movable rubber plate 34 to a predetermined range. Functioning as a unit.

The diaphragm 20 is in close contact with and fixed to the opening peripheral portion 22 to separate the liquid chamber 18 in the cavity 12, and the liquid chamber 18 is filled with an appropriate liquid such as ethylene glycol. I have. The lid member 24 is formed with two drain holes 24a at appropriate positions.

In this engine mount, the rubber movable plate 34 can be freely displaced in response to a vibration input with a high frequency and a small amplitude, so that the pressure receiving chamber 18a and the equilibrium chamber 18b are in communication with each other as if the rubber movable plate 34 was in communication. As a result, the fluid pressure fluctuation in the pressure receiving chamber 18a is absorbed and reduced. Therefore, the dynamic spring constant decreases, and transmission of high-frequency vibration to the vehicle body is suppressed. In addition, when a vibration input having a low frequency and a large amplitude, which causes a car shake, the rubber movable plate 34 displaced up and down is fixed to the stopper portion of the partition member 14, so that the pressure receiving chamber 18a and the balance chamber 18b are fixed. Are separated from each other and communicate with each other through the orifice passage 46. Therefore, a large vibration damping action against low frequency vibration can be obtained by the resonance action of the liquid flowing through the orifice passage 46.

Next, the manufacturing method of this embodiment will be described in the order of steps with reference to FIGS.

First, as shown in step A of FIG. 1, the main body 10, the partition member 14, and the diaphragm 2 manufactured separately are manufactured.
0 and the lid member 24, as shown in Step B of FIG.
It is submerged in a liquid tank 50 filled with a liquid such as ethylene glycol to be sealed therein. In the liquid, the partition member 14 and the diaphragm 20 are placed on the opening peripheral portion 22 of the main body 10.
And the lid member 24 are placed in this order. More specifically, the partition member 14 is inserted into the hollow portion 12 of the main body 10, and the outer peripheral edge of the partition member 14 is placed on the caulking bracket 36 fixed on the main body 10, and then the diaphragm 20 is moved. It is placed on the periphery of the partition member 14, and the lid member 24
Is covered.

Next, in the process C, the entire body 10 and the like are taken out of the liquid tank 50 with the opening 16 side facing upward, and the posture is kept on the base table 54 of the caulking device 52 in that posture. Set to a predetermined position.

In the following step D, the set main body 10
The main body 10 is fixed and held at a predetermined position by using the fixing units 56 arranged on both sides of the main body 10. More specifically, the cylinder 60 of each fixing unit 56 fixed to the base table 54 via the support portion 58 is driven, and the clamp 62 as a fixing jig attached to the tip of the piston rod 60a is moved to the base table 54. The main body 10 is moved forward along the rail portion 64 fixed above. Then, the tip 6 of each of the clamps 62 forming a semicircular arc shape
2a so as to surround the outer periphery of the rubber elastic body 30.
The lower surface of the substrate 26 and the upper surface of the upper reinforcing ring 40 are fitted with substantially no gap. Thereby, the main body 10 and the like are securely fixed without moving in the axial direction.

In step E, the lid member 24 is once removed from the main body 10 and the like using the hand chuck 66. After that, the hand chuck 66 is appropriately evacuated from an upper position of the main body unit 10 and the like with the lid member 24 held therebetween.

Next, in a compression stroke indicated by a stroke F, the rubber elastic body 30 is compressed and deformed in the axial direction by using a compression unit 68 disposed below the main body 10 to adjust the amount of the internally enclosed liquid. Will be More specifically, the compression unit 68
Includes a pressing jig 70 in which a plurality of rods 70a are fixed on the upper surface of a slider 70b, and a servomotor 72 that drives the pressing jig 70. The servomotor 72 includes a plurality of mounting rods 74 and mounting plates 76. It is fixed to the base table 54 through the. The rotational power of the servo motor 72 is supplied to the rotating shaft 72a, the first pulley 72b, the belt 72.
c, the screw shaft 78 via the second pulley 72d.
The tip of the screw shaft 78 is
It is screwed into a nut 70c provided on the lower surface of the slider 70b. Therefore, when the screw shaft 78 is rotationally driven by the servomotor 72, the pressing jig 70 advances and retreats in the axial direction with the mounting rod 74 as a guide, and the upper end of the rod 70a moves the second substrate 28 toward the opening 16 side, that is, in the axial direction. To compress and deform the rubber elastic body 30 by a predetermined amount. That is, the volume of the liquid chamber 18 is substantially reduced. As a result, the internal pressure of the liquid chamber 18 is increased, and the excess liquid is discharged as shown by an arrow L in FIG.
6 is pushed out through a contact portion between the upper surface and the diaphragm 20.

The amount of liquid sealed in the liquid chamber 18 can be appropriately changed according to specifications by adjusting the stroke amount of the pressing jig 70. In particular, in the present embodiment, since the stroke amount is proportional to the rotation amount of the servomotor 72, the stroke amount can be easily and accurately controlled by appropriately changing the rotation amount of the servomotor 72.

In addition, in this embodiment, during the compression stroke,
In order to prevent the diaphragm 20 from being lifted or displaced before the surplus liquid is pushed out, the diaphragm 20 is moved to a predetermined position using the holding jig 80, that is, in a free state in which the internal pressure is not applied to the liquid chamber 18. Hold in position. More specifically, the holding jig 80 is disposed above the main body 10 and the like in which the hand chuck 66 is retracted, and is lowered to a predetermined position so as to lightly hit the diaphragm 20 to hold the diaphragm 20 at the predetermined position. doing.

After the holding jig 80 is evacuated from above the main body 10 and the like, in the stroke G, the hand chuck 66 evacuated after the stroke E is again arranged above the main body 10 and the hand The lid member 24 held by the chuck 66 is placed at a predetermined position on the opening peripheral portion 22.

Then, in the fixing step indicated by the step H, the cover member 24 is caulked and fixed using the caulking jig 82 while the rubber elastic body 30 is kept in a compressed state by the compression unit 68. More specifically, the hand chuck 66 shown in the process G is retracted from above the main body 10 and the like, and the caulking jig 82 is arranged. Wall 36a
And the outer peripheral wall portion 36a is bent inward and caulked. The outer peripheral wall portion 36a is formed, for example, in a tapered waveform so as to be easily bent inward. As a result, as shown in FIG. 5, the diaphragm 20 and the peripheral edge portion 22 of the opening are fixed in a liquid-tight manner, and the liquid in the liquid chamber 18 is sealed in a liquid-tight state, thereby completing the vibration isolator.

Thereafter, in step I, the pressing jig 70 is lowered and the clamp 62 is retracted from the main body 10, and the product is removed from the caulking device 52.

In step J, the liquid remaining in the space between the diaphragm 20 and the lid member 24 is removed by turning the product upside down so that the drainage holes 24a of the lid member 24 are removed.
To be discharged from

In this state, that is, immediately after the production, as shown in FIG. 5, a restoring stress acts on the rubber elastic body 30 in the extension direction, and the inside of the liquid chamber 18 becomes a negative pressure. Specifically, the diaphragm 20 is in a state of being deformed by suction inward. However, in a use state where the product is assembled between the vehicle body side and the engine side, the rubber elastic body 30 is compressed and deformed by an axial load from the engine side, and as a result, an unnecessary internal pressure is generated inside the liquid chamber 18. It is in a state of not working.

As described above, in this embodiment, the product is sealed in the liquid chamber 18 in a state where the product is actually assembled between the vehicle body and the engine, that is, in a state in which the rubber elastic body 30 is compressed and deformed. Since the amount of liquid to be applied is adjusted to an appropriate amount, desired characteristics aimed at the time of design can be easily and accurately obtained.

Further, as in the conventional case, the deformation of the diaphragm 20 due to the excessive amount of liquid in the liquid chamber is suppressed, and the interference between the diaphragm 20 and the cover member 24 is suppressed, so that the durability of the diaphragm 20 is improved.

Further, in the compression stroke F, the stroke amount of the pressing jig 70 can be easily and accurately adjusted by controlling the rotation amount of the servomotor 72, and thus the amount of the sealed liquid can be accurately changed. Therefore, good characteristics according to the design specifications can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fluid filled type vibration damping device according to an embodiment of the present invention before assembly.

FIG. 2 is a process explanatory view of a method of manufacturing the fluid filled type vibration damping device of FIG.

FIG. 3 is a process explanatory view of a method of manufacturing the fluid filled type vibration damping device.

FIG. 4 is a process explanatory view of the manufacturing method of the fluid filled type vibration damping device.

FIG. 5 is a cross-sectional view of the fluid-filled type vibration damping device of FIG. 1 in a completed state.

FIG. 6 is a cross-sectional view showing a fluid filled type vibration damping device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Body part 12 ... Cavity part 16 ... Opening part 18 ... Liquid chamber 20 ... Diaphragm 22 ... Opening peripheral part 24 ... Lid member 26 ... 1st board 28 ... 2nd board 30 ... Rubber elastic body 40 ... Reinforcement ring 62 ... Clamp 70 ... Pressing jig

Claims (3)

[Claims] 1. A main body having a rubber elastic body extending in an axial direction, a cavity formed therein, and an opening formed at one axial end of the cavity, and covering the opening. A diaphragm that separates the liquid chamber in the cavity, and a lid member that fixes the diaphragm to the peripheral edge of the opening in a liquid-tight manner. A step of placing the diaphragm on the periphery of the opening, and compressing and deforming the rubber elastic body in the axial direction via a pressing jig, and pushing out excess liquid from the inside through the contact portion between the periphery of the opening and the diaphragm. And a fixing step of fixing the lid member to the peripheral edge of the opening while being compressed by the pressing jig, and fixing the diaphragm and the peripheral edge of the opening in a liquid-tight state. Type anti-vibration device Manufacturing method. 2. The method according to claim 1, wherein the diaphragm is held at a predetermined position by using a holding jig during the compression stroke. 3. A main body part comprising: a first substrate fixed to one of an engine side and a vehicle body side; a second substrate fixed to the other side; and a reinforcing ring projecting radially from an outer periphery of a rubber elastic body. In the compression step, a fixing jig for fixing the main body is provided, and the two substrates are connected by the rubber elastic body.
Using the pressing jig, the second substrate is placed on the side of the opening in the state of being fitted between the first substrate provided on the side of the opening and the reinforcing ring so as to surround the outer periphery of the rubber elastic body. The method for manufacturing a fluid-filled vibration damping device according to claim 1, wherein the vibration isolating device is pressed.