JP2005114082A - Liquid-filled vibration isolator - Google Patents

Abstract

A liquid-filled vibration isolator capable of improving the workability of assembling work is provided.
A first mounting tool, a cylindrical second mounting tool, a vibration isolating base made of a rubber-like elastic material, a first diaphragm, a partition body, and a first liquid chamber. An orifice 9 for communicating the second liquid chamber 7, a second diaphragm 11 that can be deformed in accordance with fluctuations in the liquid pressure of the first liquid chamber 6 and forms an air chamber 10 between the partition body 8, and negative pressure introduction The outer peripheral portion of the second diaphragm 11 was vulcanized and bonded to the flange 32 continuously provided on the upper end inner peripheral portion side of the support member 31, and the support member 31 was formed on the partition body 8. The fitting part 27 is press-fitted and fitted.
[Selection] Figure 1

Description

  The present invention includes a first fixture, a cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and a vibration isolating base provided on the second fixture. A first diaphragm that forms a liquid enclosure chamber, a partition that divides the liquid enclosure chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the first diaphragm side, and the first liquid chamber, A second diaphragm made of a rubber film that forms an air chamber between the orifice for communicating the second liquid chamber, an air chamber that can be deformed in accordance with fluctuations in the liquid pressure of the first liquid chamber, and a negative pressure supply The present invention relates to a liquid-filled vibration isolator provided with a negative pressure introduction path for introducing a negative pressure from the means into the air chamber.

  The above-described liquid-filled type vibration isolator is assembled as an engine mount in an automobile, for example. And the negative pressure from the negative pressure supply means is set to a negative pressure supply state in which the negative pressure is continuously supplied to the air chamber, and the resonance action of the liquid flowing through the orifice with the volume change of the first liquid chamber and the second liquid chamber Absorbs engine shake etc. Further, an alternate supply state in which negative pressure and atmospheric pressure are alternately supplied to the air chamber is set, and fluctuations in the fluid pressure in the first fluid chamber are controlled to absorb idling vibration. In addition to the structure described at the beginning, a liquid chamber forming member for forming a third liquid chamber is provided between the second diaphragm and an orifice for communicating the first liquid chamber and the third liquid chamber to form an idling vibration. Structures that allow more accurate absorption have also been developed.

  Conventionally, in this type of liquid-filled vibration isolator, as shown in FIG. 3, the outer peripheral portion of the second diaphragm 11 is placed on the lower surface of the flange 32 on the lower end inner peripheral portion side of the cylindrical support member 31. The support member 31 was press-fitted and fitted into the fitting recess formed in the partition body 8 by vulcanization and adhesion over the entire circumference.

In FIG. 3, 1 is a first fixture, 2 is a second fixture, 3 is an anti-vibration base made of rubber-like elastic material, 4 is a liquid sealing chamber, 5 is a first diaphragm, 6 is a first liquid chamber, 7 Is a second liquid chamber, 12 is a negative pressure supply means, 18 is a third liquid chamber, and 30 is a negative pressure supply hose. A similar structure is disclosed in Patent Document 1.
Japanese Patent Laid-Open No. 10-288239

  As an assembling means of this type of liquid-filled vibration isolator, a cylindrical support member 31 vulcanized and bonded to the second diaphragm 11 is press-fitted and fitted in the fitting recess of the partition body 8 in the air, and thereafter In addition, there is means for assembling these integrals with the second fixture 2 in the liquid.

  However, in the conventional liquid-filled vibration isolator, the second diaphragm 11 is positioned on the lower end side of the cylindrical support member 31 and the support member 31 is press-fitted and fitted into the fitting recess of the partition body 8. Further, when air is trapped between the outer peripheral surface of the support member 31 and the inner peripheral surface of the fitting recess during assembly, the air rises between the outer peripheral surface and the inner peripheral surface, and the first liquid chamber 6 In some cases, it may not be possible to exhibit the desired vibration-proof performance.

  Therefore, in order to assemble the conventional structure, the outer peripheral surface and the inner peripheral surface are soaked in the liquid so that air is not caught between the outer peripheral surface of the support member 31 and the inner peripheral surface of the fitting recess. It was necessary to match, and it took time and effort to assemble.

  An object of the present invention is to provide a liquid-filled vibration isolator capable of improving the workability of assembly work.

The characteristic configuration of the present invention includes a first mounting tool, a cylindrical second mounting tool, a vibration-proof base made of a rubber-like elastic material for connecting them, and the vibration-proof base provided on the second mounting tool. A first diaphragm that forms a liquid enclosure between the first diaphragm, a partition that divides the liquid enclosure into a first liquid chamber on the side of the vibration isolation base and a second liquid chamber on the side of the first diaphragm, and the first An orifice for communicating between the liquid chamber and the second liquid chamber; a second diaphragm made of a rubber film that is deformable in accordance with fluctuations in the liquid pressure of the first liquid chamber and that forms an air chamber between the partition body; A liquid-filled vibration isolator provided with a negative pressure introduction path for introducing a negative pressure from a negative pressure supply means into the air chamber,
A fitting in which the outer peripheral portion of the second diaphragm is vulcanized and bonded to the flange continuously provided on the inner peripheral side of the upper end of the cylindrical support member, and the cylindrical support member is formed on the partition body It is in the point which is press-fitted and fitted to the part.

  According to this configuration, the second diaphragm is positioned on the upper end side of the cylindrical support member, and the support member is press-fitted and fitted into the fitting portion formed in the partition body. Even if air is caught between the inner peripheral surface of the support member and the outer peripheral surface of the fitting portion, the air rising between the two (the inner peripheral surface and the outer peripheral surface) is received by the flange on the upper end side of the support member. , Air can be prevented from entering the liquid chamber.

  In other words, in order to prevent the intrusion of air into the liquid chamber, there is an assembling unit that takes time and effort to press-fit the support member and the fitting portion by immersing the inner peripheral surface of the support member and the outer peripheral surface of the fitting portion in the liquid. It is not necessary to adopt this, and the press-fitting external fitting can be performed in the air.

  In the present invention, a liquid chamber forming member for forming a third liquid chamber is provided between the second diaphragm and an orifice for communicating the first liquid chamber with the third liquid chamber is formed. be able to.

  In this configuration, when absorbing idling vibrations, for example, negative pressure and atmospheric pressure can be alternately supplied to the air chamber to absorb fluctuations in the fluid pressure in the first fluid chamber, thereby reducing the dynamic spring constant. be able to. In addition, the third liquid chamber and the first liquid chamber, which are subject to pressure fluctuations due to the operation of the second diaphragm, are connected to each other by an orifice, and the liquid in the orifice is transferred to the first liquid chamber in accordance with the operation of the second diaphragm. Because it can resonate with the fluid pressure fluctuation of the liquid, the vibration energy can be changed to a sine wave that does not contain high-frequency component noise, etc., and idling vibration can be absorbed more accurately. Can do.

  Accordingly, it is possible to provide a liquid filled type vibration isolator capable of improving the workability of the assembling work.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the first mounting bracket 1 mounted on the automobile engine, the cylindrical second mounting bracket 2 mounted on the vehicle body side member, and a rubber-like elastic material for connecting them. A first diaphragm 5 which is provided on the vibration isolating base 3 and is provided on the second mounting bracket 2 and forms a liquid enclosure chamber 4 between the anti-vibration base 3 and a first liquid on the side of the anti-vibration base 3 on the liquid enclosure chamber 4. A partition 8 for partitioning the chamber 6 and the second liquid chamber 7 on the first diaphragm 5 side, and a first orifice 9 for communicating the first liquid chamber 6 and the second liquid chamber 7 are provided to provide a liquid-filled vibration isolator. It is configured.

  In addition, the second diaphragm 11 which can be deformed in accordance with the fluctuation of the fluid pressure in the first fluid chamber 6 and forms the air chamber 10 between the partition body 8 and the negative pressure from the negative pressure supply means 12 is supplied to the air chamber 10. A negative pressure introduction path 13 for introducing the first liquid chamber 6 is provided, and a liquid chamber forming member 19 for forming the third liquid chamber 18 is provided between the second diaphragm 11 and the first liquid chamber 6 and the third liquid chamber 18 to communicate with each other. A second orifice 20 is formed.

  The second mounting bracket 2 includes an upper cylindrical member 21 having a constant diameter and a lower cylindrical member 22 that is press-fitted and fitted to the upper cylindrical member 21 and has a reduced diameter on the lower end side. The anti-vibration base 3 is vulcanized over the bulging large diameter portion 1A on the lower end side of the first mounting bracket 1 and the upper half inner peripheral portion of the upper cylindrical member 21. A thin first rubber wall 14 connected to the anti-vibration base 3 is vulcanized and formed on the inner peripheral portion of the upper half of the upper cylindrical member 21 so as to form a taper film that is thinner toward the lower end side.

  The partition body 8 includes a cylindrical portion 15 that is press-fitted and fitted into the lower cylindrical member 22, and a bottom wall portion 16 that is convex and has a partially spherical bottom wall. The bottom wall portion 16 forms a chamber wall of the second liquid chamber 7. One side portion of the bottom wall portion 16 projects outward in the radial direction, and a connection portion 17 having the negative pressure introduction path 13 is formed therein, and a negative pressure supply hose 23 is connected thereto.

  The cylindrical portion 15 is formed in a stepped shape, the upper end portion is in pressure contact with the first rubber wall 14 of the upper cylindrical member 21, and the middle portion in the vertical direction is the inner peripheral surface of the large diameter cylindrical portion 24 of the lower cylindrical member 22. The lower end portion is in pressure contact with the thin second rubber wall 26 vulcanized and bonded to the inner peripheral surface of the reduced diameter cylindrical portion 25 of the lower cylindrical member 22. Further, the upper end portion of the cylindrical portion 15 is formed in an annular shape concentric with the bottom wall portion 16 to form a fitting convex portion 27 (corresponding to the fitting portion) having a larger diameter than the bottom wall portion 16. The first orifice 9 is formed at the lower end of the cylindrical portion 15.

  The liquid chamber forming member 19 is made of a thin metal disk. A flange-shaped recess 28 that is slightly widened downward is formed on the outer peripheral side of the liquid chamber forming member 19, and a flange shape that presses against a receiving portion 29 on the lower end side of the vibration isolating base 3 on the upper end side of the outer peripheral portion. The fixed portion 30 is formed.

  The first diaphragm 5 is made of a disc-shaped rubber film having a corrugated longitudinal section, and the outer peripheral portion is vulcanized and bonded to the inner peripheral surface of the reduced diameter cylindrical portion 25 of the lower cylindrical member 22 and the second diaphragm 5 It is connected to the rubber wall 26.

  The second diaphragm 11 is made of a disc-like rubber film that is thicker and smaller in diameter than the first diaphragm 5. With the second diaphragm 11 closing the opening on the upper end side of the cylindrical support member 31, the entire outer periphery of the second diaphragm 11 is placed on the lower surface of the flange 32 connected to the upper end inner periphery side of the support member 31. The support member 31 is press-fitted and externally fitted to the fitting convex portion 27 of the partition body 8 by vulcanization bonding over the circumference. The liquid chamber forming member 19 is sandwiched and fixed by the flange 32 and the receiving portion 29 on the lower end side of the vibration isolating base 3. As a result, the upper surface of the flange 32 is pressed against the bottom surface of the concave portion 28 of the liquid chamber forming member 19 from above, and the lower surface of the flange 32 is in pressure contact with the upper surface of the fitting convex portion 27.

  When assembling the liquid-filled vibration isolator having the above structure, as shown in FIG. 2, the support member 31 vulcanized and bonded to the second diaphragm 11 is press-fitted into the fitting convex portion 27 of the partition body 8 in the air. The upper end of these integrals is assembled to the upper cylindrical member 21 and the lower end is assembled to the lower cylindrical member 22 in the liquid.

  With the above structure, when the air chamber 10 is connected to the atmosphere and is set to atmospheric pressure, the engine shake is caused by the resonant action of the liquid flowing through the first orifice 9 as the volume of the first liquid chamber 6 and the second liquid chamber 7 changes. The low-frequency vibration such as engine shake can be absorbed by the resonance action of the liquid flowing through the second orifice 20 with the volume change of the first liquid chamber 6 and the third liquid chamber 18. Can be absorbed. And if it sets to the alternate supply state which alternately supplies a negative pressure and atmospheric pressure to the air chamber 10, the fluid pressure fluctuation | variation of the 1st fluid chamber 6 is controlled, and idling vibration whose frequency is higher than an engine shake is absorbed. Can do.

Longitudinal section of liquid-filled vibration isolator Exploded longitudinal section Longitudinal section of a conventional liquid-filled vibration isolator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st fixture 2 2nd fixture 3 Anti-vibration base | substrate 4 Liquid enclosure 5 First diaphragm 6 1st liquid chamber 7 2nd liquid chamber 8 Partition body 9 Orifice (1st orifice)
DESCRIPTION OF SYMBOLS 10 Air chamber 11 2nd diaphragm 12 Negative pressure supply means 13 Negative pressure introduction path 18 3rd liquid chamber 19 Liquid chamber formation member 20 Orifice 27 Fitting part 31 Support member 32 Flange

Claims (2)

A liquid enclosure is provided between the first fixture, the cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and the vibration isolating base provided on the second fixture. Forming a first diaphragm, a partition for partitioning the liquid sealing chamber into a first liquid chamber on the vibration isolation base side and a second liquid chamber on the first diaphragm side, the first liquid chamber and the second liquid chamber A second diaphragm made of a rubber film that is freely deformable in accordance with fluctuations in the fluid pressure of the first fluid chamber and forms an air chamber between the partition body and a negative pressure from the negative pressure supply means A liquid-filled vibration isolator provided with a negative pressure introduction path for introducing pressure into the air chamber,
A fitting in which the outer peripheral portion of the second diaphragm is vulcanized and bonded to the flange continuously provided on the inner peripheral side of the upper end of the cylindrical support member, and the cylindrical support member is formed on the partition body Liquid-filled vibration isolator that is press-fitted and fitted into the part. 2. The liquid-filled type prevention according to claim 1, wherein a liquid chamber forming member for forming a third liquid chamber is provided between the second diaphragm and an orifice for communicating the first liquid chamber with the third liquid chamber. Shaker.

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