JP3071943B2 - Liquid ring anti-vibration support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-sealed anti-vibration support device used for an engine mount of an automobile.

[0002]

2. Description of the Related Art This kind of liquid ring vibration isolating support device has a characteristic that a spring constant increases in a frequency range higher than a tuning frequency range of an orifice. This is considered to be because the liquid cannot be sufficiently moved in this high frequency range, and the presence of the liquid rather causes the hardness of the spring. Also, resonance between the rubber elastic material and the liquid may occur, and the spring constant may increase. Therefore, if the state is maintained as it is, the vibration transmissibility of the medium-frequency vibration generated when the vehicle is running increases, and the problem of indoor noise occurs.

For this reason, there has been proposed a method in which a vibrating narrow wing body is provided in a liquid chamber and the liquid is agitated to suppress an increase in a spring constant (Japanese Utility Model Application Laid-Open No. 63-6248).
No.) This effect is effective if the gap between the wing body and the surrounding wall is considerably narrowed, or the gap between the wing body and the facing part (bottom) is narrowed and the wing body does not have high rigidity. Is less. However, when the wing is actually used in an automobile, since vibration is input from all directions, unless a certain gap is provided around the wing, the wing comes into contact with the side wall or the facing portion, causing a shock. Therefore, if the gap is widened to the extent that it can be used practically, the high frequency range (100 to
(Between 500 Hz), the peak of the spring constant may occur.

[0004]

In order to solve this problem, the present inventors provided a convex portion at the tip of the wing body and formed a concave pot into which the convex portion could enter the wall of the liquid chamber. A method has been proposed in which the protrusion is moved into and out of the recessed pot to further promote the stirring of the liquid (Japanese Patent Application No. Hei.
353281). However, this has a complicated structure, increases the cost, and has insufficient tuning elements for the target frequency. The present invention is intended to solve such a problem. In short, the present invention is capable of inexpensively manufacturing a liquid-sealed anti-vibration support device that has many tuning elements and can suppress an increase in a spring constant in all the middle and high frequency regions. is there.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has an interposed body of a rubber elastic material interposed between an inner cylinder and an outer cylinder arranged in parallel, and communicates with the interposed body by an orifice. In a liquid-seal and vibration-isolating support device in which a liquid chamber filled with liquid is separated above and below the inner cylinder, a wing body having a small-diameter neck is suspended from the inner cylinder side in the lower liquid chamber. Provided is a liquid-sealing and vibration-proof supporting device, wherein the wing body and the neck are connected to respective side walls on both sides in the axial direction forming a liquid chamber by connecting bands of a rubber elastic material.

Further, according to the present invention, an intervening body made of a rubber elastic material is interposed between an inner cylinder and an outer cylinder arranged in parallel, and a liquid chamber filled with liquid is communicated with the intervening body through an orifice. In the liquid seal anti-vibration support device spaced above and below, in the lower liquid chamber, a wing body having a small-diameter neck is suspended from the inner cylinder side,
The present invention also provides a liquid-seal and vibration-isolating support device wherein the wings are connected to side walls on both axial sides forming a liquid chamber by connecting bands of a rubber elastic material.

[0007]

By taking the above measures, that is, since only the neck and the wing or the wing are connected to the side wall by the connecting band, the strength of the side wall can be increased without greatly increasing the rigidity in the vertical direction. it can. Also, by changing the components of the connection band, the flow rate of the liquid can be changed, and as a result, the spring constant in the middle and high frequency range can be suppressed low. That is, when a peak of the spring constant occurs in a specific frequency range and a noise problem occurs, the position of the peak can be changed by changing the width, thickness, quantity, and the like of the connection band.

Further, buckling and outward swelling (body swelling) of the side wall during vibration can be suppressed, so that the amount of sag is small and durability is improved. Further, since the liquid movement amount of the orifice increases, the damping performance also improves. Other features include a simplified structure.

[0009]

FIG. 6 is a front view of a liquid-sealed anti-vibration support device.
This liquid-sealed vibration isolating support device includes an inner cylinder 10 and a cylindrical interposed body 12 made of a rubber elastic material attached to the outer periphery of the inner cylinder 10.
And an outer cylinder 14 fitted on the outer periphery of the intervening body 12. This embodiment shows an engine mount in which the inner cylinder 10 is fixed to the chassis-side member and the outer cylinder 14 is fixed to the engine-side member. In order to support the weight of the engine, the inner cylinder 10 is mounted in the load direction ( It is eccentric to the upper side in advance (direction from bottom to top in FIG. 6).

FIG. 3 is a right side view, partially in cross section, of an outer cylinder 14 of a liquid-sealed anti-vibration support device according to an embodiment of the present invention, FIG. 4 is a left side view, and FIG. The intervening body 12 is provided with recessed portions 16 and 18 that are recessed from the outer periphery toward the center while leaving both ends intact. A penetrating portion 20 penetrating in the axial direction is formed in a portion of the interposition body 12 above the inner cylinder 10 for the purpose of softening the rubber. The bottom is formed on the left and right sides of the protruding portion 22 formed so that the inner periphery thereof abuts and the inside of the penetrating portion 20 protrudes toward the inner cylinder 10 side.
And it is depressed to the extent that a certain thickness is maintained. This thickness is set to be relatively thin, and the bottom of the recess 16 has a diaphragm structure that increases the amount of liquid movement, and hangs down in the through portion 20. Therefore, the upper concave portion 16 has a structure that is divided into two parts on the left and right sides of the projecting part 22. However, a passage 24 is formed before and after the outer periphery of the overhang portion 22, and the two recessed portions 16 communicate with each other.

The lower recessed portion 18 is formed to be recessed below the inner cylinder 10 to such an extent that the intervening body 12 maintains a considerable thickness, and the top portion (the lowest portion in FIG. 5) has Recess 1
A bridging portion 26 is provided for bridging the wall surfaces constituting the front and rear wall portions 8. Further, a reinforcing ring 28 obtained by cutting out the two recessed portions 16 and 18 into a window shape is embedded and reinforced near the outer periphery of the intervening body 12. In addition, a recess 29 which is partially recessed is formed on the outer surface of the intervening body 12 immediately below the inner cylinder 10 to which a load is applied, thereby improving durability.

When the above-described intervening body 12 is immersed in a liquid and the outer cylinder 14 is fitted therein, the two concave portions 16 and 18 are formed into liquid chambers 16 and 18 in which the liquid is sealed. That is, the two recessed portions 16 and 18 respectively have the bottom surface and the side surface
2 (in this case, the intervening body 12 existing on the bottom side is defined as the partition wall 30 and the intervening body 12 existing on the side surface is defined as the side wall 32), and the upper surface is covered with the outer cylinder 14 and sealed. If the inside is filled with a liquid, it will be in a liquid sealed state. At this time, the lower liquid chamber 18 is called a main liquid chamber, and the upper liquid chamber 16 is called a sub liquid chamber.

However, the main liquid chamber 18 and the sub liquid chamber 16 communicate with each other through an orifice 34, and the main and sub liquid chambers 1 are vibrated by vibration.
When the liquids 8 and 16 expand and contract, the liquid inside can move. The orifice 34 is provided for the main and sub liquid chambers 18,
The outer cylinder 1 is attached to the cylindrical portion of the
4 is formed as an annular groove provided with a seal lip 35 for holding a seal with the main and sub liquid chambers 1.
8 and 16. In addition, the portion of the orifice 34 that communicates with the main liquid chamber 18 is set near the bridging portion 26, and the portion that communicates with the subordinate liquid chamber 16 extends to a far side beyond the overhang portion 22. The entire length of the rubber elastic body 12 is extended so as to go around at least a half circumference. Further, the orifice 34 is formed in one or both of the front and rear of the main and slave liquid chambers 18 and 16 in the cylindrical portion of the intervening body 12.

According to the present invention, a wing body 38 having a small diameter neck portion 36 is provided in the main liquid chamber 18 in addition to the above structure. That is, as shown in FIG.
The same metal wing plate 42 is fixed to the leading end of the inner cylinder 10 so as to protrude from the inner cylinder 10 and hang down. The expansion direction of the wing plate 42 is set to the axial direction or a direction perpendicular to the axial center, and the space between the tip of the wing plate 42 and the partition wall 30 is narrowed to form a small-diameter neck portion 36. Next, in the present invention, as shown in FIG. 3, the wing body 38 and the side walls 32 on both sides are connected by a connecting band 44 made of a rubber elastic material.
FIG. 7 is a bottom view of the wing body 38. The width L of the connection band 44 is used as a frequency tuning element as described later.

FIG. 1 is a right side view, partially in section, of an outer cylinder 14 of a liquid-sealed anti-vibration support device according to another embodiment of the present invention.
Is a transverse cross-sectional view.
The portion 6 is also connected to the side wall 32 by a connecting band 46 made of a rubber elastic material. The width L of the connecting band 44 of the wing body 38 is shown in FIG.
Is substantially the same as the wing body 38, and the connecting band 4
The width R of 6 is larger than the width L of the connecting band 44 described above. The widths L and R of the connecting bands 44 and 46 are also used as tuning elements.
Since the number (the number of stages) can be adopted in addition to R, it can be said that the tuning range is wide.

By providing the wing body 38 or the neck portion 36 connected to the side wall 32 by the connection bands 44 and 46 in this manner,
At the time of vibration, the wing body 38 promotes agitation of the liquid and changes the resonance point of the rubber elastic material. As a result, an increase in the spring constant in an arbitrary frequency range can be suppressed.
FIG. 8 shows the characteristics showing the relationship between the vibration frequency and the absolute spring constant of various liquid ring vibration isolating and supporting devices. In the case where only the wing body 38 is provided, when the vibration frequency becomes higher than 400 Hz, the absolute It has the characteristic that the spring constant suddenly increases. However, when the wing body 38 and the neck portion 36 were connected to the side wall 32 by the two connection bands 44 and 46 as in the case of the present invention, the characteristics of maintaining a relatively low spring constant up to the peak were exhibited. Furthermore, in this case, it was also found that the peak shifted to the lower frequency side as the widths L and R of the connection bands 44 and 46 were increased. It also has the characteristic that the peak does not protrude so much. On the other hand, only the wing body 38 is connected by the connecting band 44 to the side wall 32.
, The peak is in a relatively high frequency range, but the peak value is lower than that of the wing body 38 alone.

[0017]

As described above, according to the present invention, the wing body having a small diameter neck portion is provided in the main liquid chamber,
Since the neck and the wing body or the wing body are connected to the side wall by the connecting band, by changing the width, thickness and number of the connecting band, the stirring action of the liquid can be arbitrarily changed, and the rubber elastic material is used. The resonance point between the fluid and the liquid can also be changed arbitrarily,
As a result, an increase in the spring constant in a specific frequency range can be suppressed. For example, when it is desired to suppress the rise of the spring constant and slide the frequency range to the lower side, the width and thickness of the connection band can be increased, and the number can be increased. This can be dealt with by taking the reverse method.

Further, the presence of the connecting band can suppress the buckling and bulging of the side wall during vibration, and reduce the amount of set and improve the durability. Further, the damping performance is improved because the amount of liquid movement of the orifice is increased. In addition, the structure also has an excellent effect that the cost is not greatly increased because the neck and the wing body or the wing body and the side wall are merely connected by the connection band.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional right side view of an outer cylinder of a liquid-sealed anti-vibration support device according to the present invention.

FIG. 2 is a cross-sectional view of the liquid-sealed vibration isolating support device according to the present invention.

FIG. 3 is a partial cross-sectional right side view of an outer cylinder of the liquid-sealed vibration-proof and support device according to the present invention.

FIG. 4 is a left side view in which an outer cylinder of the liquid ring anti-vibration support device according to the present invention is cut.

FIG. 5 is a cross-sectional view of the liquid-sealed vibration isolating support device according to the present invention.

FIG. 6 is a front view of the liquid-sealed anti-vibration support device according to the present invention.

FIG. 7 is a front view of the connecting band as viewed from below.

FIG. 8 is a characteristic showing a relationship between a frequency of the liquid-sealed vibration-proof and support device and an absolute spring constant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inner cylinder 12 Intermediate body 14 Outer cylinder 16 Liquid chamber 18 Liquid chamber 32 Side wall 34 Orifice 36 Neck 38 Wing body 44 Connecting band 46 Connecting band

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-3340 (JP, A) JP-A-62-261173 (JP, A) JP-A-1-92542 (JP, U) JP-A-63 6248 (JP, U) Hikaru 1-149042 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16F 13/14 B60K 5/12

Claims (2)

(57) [Claims] An interposed body of a rubber elastic material is interposed between an inner cylinder and an outer cylinder which are arranged in parallel, and a liquid chamber filled with a liquid is communicated with the interposed body by an orifice, and a liquid chamber filled with liquid is separated above and below the inner cylinder. In the liquid-sealed vibration isolating support device provided, a wing body having a small-diameter neck is suspended from the inner cylinder side in the lower liquid chamber, and the wing body and the neck are attached to both axial side walls forming the liquid chamber. A liquid-sealing and vibration-isolating support device, wherein each of the devices is connected to a rubber elastic material connecting band. 2. An interposed body of a rubber elastic material is interposed between an inner cylinder and an outer cylinder which are arranged in parallel, and a liquid chamber, which is communicated with the interposed body through an orifice, and in which liquid is sealed, is separated above and below the inner cylinder. In the installed liquid-seal vibration-isolating support device, a wing body having a small-diameter neck is hung down from the inner cylinder side in the lower liquid chamber, and this wing body is attached to the axial side walls forming the liquid chamber. A liquid-sealing vibration isolating support device, wherein the device is connected by a connecting band of rubber elastic material.