JP2006097717A - Liquid sealing type vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid sealing type vibration control device capable of effectively reducing vibration in each of mutually different vibration frequency regions. <P>SOLUTION: This liquid sealing type vibration control device 10 has a rigid outer member 14, a rigid inner member 12, a main body rubber part 16, a main liquid chamber 36, an auxiliary liquid chamber 38, a rigid partitioning member 34 for partitioning them, and a cylindrical part 42 forming an orifice flow passage 43 for communicating the main liquid chamber 36 with the auxiliary liquid chamber 38 on an inner side. The whole cylindrical part 42 is constituted as a dynamic damper 54 having a cylindrical rubber spring 50 and a mass member 52. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid seal type vibration isolator, and more specifically, a liquid chamber is partitioned into a main liquid chamber and a sub liquid chamber by a partition member, and a main liquid chamber and a sub liquid chamber are formed by a cylindrical portion provided in the partition member. It is related with the liquid seal type vibration isolator of the type which formed the orifice flow path which flows a liquid between the inside.

  Conventionally, a liquid-sealed anti-vibration device that fills the inside of the liquid chamber and compensates for the lack of the anti-vibration function of the rubber elastic body (main rubber part) by using the attenuation caused by the flow of the liquid is an engine mount. Widely used as others.

FIG. 7 shows a specific example thereof.
7 shows a type in which a liquid chamber is divided into a main liquid chamber and a sub liquid chamber by a partition member, and an orifice channel is formed inside by a cylindrical portion provided in the partition member. .
In the figure, reference numeral 200 denotes the liquid seal type vibration isolator, and 202 and 204 denote inner metal fittings (rigid inner members) and outer metal fittings (rigid outer members), respectively.

Reference numeral 206 denotes a main rubber portion made of a rubber elastic body for connecting the inner metal fitting 202 and the outer metal fitting 204 in the inner and outer directions, and has a ring shape around the inner metal fitting 202 as a whole.
The liquid seal type vibration isolator 200 has a main body rubber portion 206 as a wall and a liquid chamber formed on the upper side thereof. The liquid chamber is separated by a partition fitting (rigid partition member) 208 on the main rubber portion 206 side. It is divided into a liquid chamber 210 and a sub liquid chamber 212.

  Reference numeral 214 denotes a cylindrical portion integrally provided at the center of the partition member 208, and an orifice channel 216 that causes the liquid to flow back and forth between the main liquid chamber 210 and the sub liquid chamber 212 inside the cylindrical portion 214. Is formed.

  The liquid seal type vibration isolator 200 is fixed to the vibrating body, for example, the engine side by a bracket (not shown) in the inner metal fitting 202, and is fixed to, for example, the vehicle body by the bracket 218 in the outer metal fitting 204.

That is, the liquid seal type vibration isolator 200 shown in FIG. 7 is of a type that supports the vibrating body in a suspended manner.
In the liquid ring type vibration isolator 200, the liquid in the liquid chamber moves back and forth from the main liquid chamber 210 to the sub liquid chamber 212 through the orifice channel 216 or vice versa by the vertical vibration input in the figure. The input vibration is attenuated by energy absorption based on viscous flow at the time.

  The damping action is highest when the liquid column resonance occurs, and the resonance frequency of the liquid column resonance is adjusted (tuned) so as to reduce the vibration most effectively in the region of the target vibration frequency.

  For example, when the purpose is to reduce vibration during idling of a vehicle, the resonance frequency of the liquid column resonance is tuned with respect to the idling frequency to increase the damping, and the dynamic spring constant during idling is lowered. .

  However, this liquid ring type vibration isolator 200 can only achieve effective vibration reduction only in a single vibration frequency region, and may cause other vibration frequency regions, for example, a booming sound in the vehicle interior. In the high frequency vibration region, there is a problem that vibration reduction based on liquid column resonance cannot be exhibited.

Patent Document 1 below discloses a liquid seal type vibration isolator of the same type as that shown in FIG. 7 in terms of a suspended liquid seal type vibration isolator.
Patent Documents 2 and 3 below disclose a liquid seal type vibration isolator provided with a dynamic damper in a liquid chamber.
However, those disclosed in Patent Document 2 and Patent Document 3 are different from the present invention in the configuration of the liquid seal type vibration isolator and in the solution means.

JP-A-8-128491 Japanese Patent Laid-Open No. 9-133178 Japanese Patent Laid-Open No. 11-141595

  The present invention was made for the purpose of providing a liquid ring type vibration isolator capable of effectively reducing vibration in each of different vibration frequency regions against the background as described above. is there.

  Accordingly, in the first aspect, (a) the rigid outer member, (b) the rigid inner member, and (c) the outer member and the inner member are connected inward and outward, and an annular shape is formed around the inner member. Rigid partition that divides the main body rubber part, (d) a liquid chamber formed with the main body rubber part as a wall, and (e) the liquid chamber is divided into a main liquid chamber on the main body rubber part side and a sub liquid chamber on the opposite side. A member, and (f) a cylindrical portion that is provided in the partition member and forms an orifice channel on the inside that communicates the main liquid chamber and the sub liquid chamber. A liquid-sealed vibration isolator that makes a damping effect by flowing a liquid between the sub liquid chamber, and the whole or a part of the cylindrical portion is pivoted from the partition member side to the main liquid chamber side. A dynamic damper having a cylindrical rubber spring protruding in the direction and a cylindrical mass member fixed to the tip of the rubber spring in the axial direction Characterized in that to have configured.

  According to a second aspect of the present invention, in the first aspect, the vibration isolator suspends and supports a vibrating body on the inner member side, and the inner member has a cup-shaped portion, and the cylindrical shape The mass member forming a part of the portion is inserted into the cup-shaped portion, and a liquid flow path is formed between the mass member and the cup-shaped portion.

Effects and effects of the invention

As described above, the present invention provides a cylindrical rubber spring in which the whole or a part of the cylindrical portion forming the orifice channel on the inside protrudes in the axial direction toward the main liquid chamber, and the axial direction of the rubber spring. It is configured as a dynamic damper having a cylindrical mass member fixed to the tip.
According to the present invention, the original function as the cylindrical portion, that is, the orifice channel is formed inside thereof, and the attenuation based on the flow of the liquid in the channel, particularly the function of the attenuation due to the liquid column resonance is lost. In addition, it can have a function as a dynamic damper.
Specifically, according to the present invention, by using the liquid column resonance of the liquid flowing through the orifice channel and the resonance of the dynamic damper, it is possible to effectively reduce the vibrations in the different vibration frequency ranges, for example, the vehicle It is possible to effectively reduce the vibration during idling and the vibration in the high-frequency vibration frequency region that generates a muffled noise in the vehicle interior.

Further, in the present invention, the cylindrical part itself (entirely or a part thereof) that forms the orifice channel inside is configured as a dynamic damper. Therefore, when the dynamic damper is configured separately from the cylindrical part. In comparison, the internal structure of the liquid seal type vibration isolator can be simplified.
In addition, the dynamic damper can be vibrated using the liquid flow in the portion where the liquid flow is most actively generated.
Further, in the present invention, there is an advantage that the frequency of the liquid column resonance can be adjusted by changing the rubber thickness of the cylindrical rubber spring.
Specifically, the cross-sectional area of the orifice channel inside the cylindrical portion can be easily changed without changing the partition member or the like by simply changing the rubber thickness of the rubber spring. The resonant frequency of the liquid flowing through the inner orifice channel can be easily tuned to the target resonant frequency.

Next, according to the second aspect of the present invention, the liquid seal type vibration isolator is a suspension type that supports the vibrating body on the inner member side, and the inner member has a cup shape. The mass member forming a part of the cylindrical portion is inserted into the inside of the tube, and a liquid flow path is formed between the mass member and the inner member. It becomes possible to form the flow path between the inner member and the inner member as a separate orifice flow path.
In this way, the third resonance can be further generated.

Next, an embodiment when the liquid seal type vibration isolator of the present invention is applied to an engine mount will be described in detail with reference to the drawings.
1 to 3, reference numeral 10 denotes a liquid ring type vibration isolator used as an engine mount. The liquid ring type vibration isolator 10 includes an inner metal fitting (rigid inner member) 12 and an outer metal fitting (rigid outer member). Member) 14 and a main rubber part 16 for connecting them in the inner and outer directions.

Here, the inner metal fitting 12 has an upper cup-shaped portion 18 and a shaft portion 22 having a lower female screw hole 20, and the shaft portion 22 is fixed to the engine.
That is, the liquid seal type vibration isolator 10 is fixed to the engine by the inner metal fitting 12 and supports it in a suspended manner.

On the other hand, the outer metal fitting 14 is divided into a lower part 24 and an upper part 26 that constitute a main body thereof, and these are caulked and fixed at a caulking portion 28 together with a partition metal fitting 34 to be described later.
The upper portion 26 is provided with an opening 30, and a rubber diaphragm wall 32 is formed in the opening 30.
The diaphragm wall 32 forms a wall of a sub liquid chamber 38 to be described later.

The main rubber part 16 has an annular shape around the inner metal fitting 12, and a liquid chamber is formed with the main rubber part 16 on the upper side of the main rubber part 16 as a lower wall.
Reference numeral 34 denotes a partition member (rigid partition member) disposed in the liquid chamber. The partition member 34 divides the liquid chamber into a lower main liquid chamber 36 on the main rubber part 16 side and an upper sub liquid chamber 38. It is partitioned.

The partition fitting 34 has a through-opening 40 formed in the center thereof, and a cylindrical tubular portion 42 protrudes downward from the opening 40, and a main liquid chamber 36 and a sub-liquid chamber are provided inside thereof. An orifice channel 43 that communicates with 38 is formed.
A cylindrical portion 44 that rises upward from the periphery of the opening 40 is also integrally formed with the partition fitting 34.
Reference numeral 46 denotes a rubber elastic body having a cylindrical shape, and an upper portion thereof serves as a fixing portion 48, and the fixing portion 48 is integrally fixed to the inner peripheral surface of the cylindrical portion 44 by vulcanization adhesion.

The lower part of the rubber elastic body 46 is a cylindrical rubber spring 50 protruding from the partition metal fitting 34 toward the main liquid chamber 36, and a cylindrical metal mass member 52 is also added to the tip of the rubber spring 50. It is fixed integrally by sulfur bonding.
Here, the cylindrical mass member 52 and the rubber spring 50 are provided concentrically, and the inner diameter of the mass member 52 and the inner diameter of the rubber spring 50 are the same.

In the present embodiment, the rubber spring 50 and the mass member 52 constitute a dynamic damper 54. In other words, in this embodiment, the entire cylindrical portion 42 protruding downward from the partition metal fitting 34 is configured as the dynamic damper 54.
The cylindrical mass member 52 in the dynamic damper 54 is inserted into the cup-shaped portion 18 of the inner metal member 12, and a flow path 56 is also formed between the mass member 52 and the cup-shaped portion 18. .

In the liquid seal type vibration isolator 10 of the present embodiment, when vibration input from the engine is applied in the vertical direction with respect to the inner metal member 12, the vibration is further caused by elastic deformation of the main rubber part 16, and further the main liquid chamber. 36 is reduced based on the damping action of the liquid flowing through the orifice flow path 43 from the auxiliary liquid chamber 38 to the reverse side.
The damping effect due to the flow of the liquid is greatest when the liquid column resonance occurs.

In this embodiment, the resonance frequency of the liquid column resonance is set so that vibration transmission is most reduced in the vibration frequency region during idling.
However, it is also possible to set the resonance frequency of the liquid column resonance so that vibration transmission is reduced in other vibration frequency regions.

In the liquid ring type vibration isolator 10 of the present embodiment, the vibration can be satisfactorily reduced even in another vibration frequency region by the dynamic damper 54.
For example, by setting the resonance frequency of the dynamic damper 54 so as to reduce vibration in a high frequency vibration region that generates a booming noise in the vehicle interior, the booming noise can be satisfactorily suppressed.

FIG. 4 shows the vibration characteristics in a single dynamic damper 54 state. In the figure, the horizontal axis represents the frequency of the excitation force, and the vertical axis represents the gain.
As shown in the figure, the dynamic damper 54 has a resonance point at about 140 Hz in a single product state. That is, the dynamic damper 54 resonates when excited at about 140 Hz.
In FIG. 4, the solid line represents the gain, and the broken line represents the phase delay angle of the displacement with respect to the excitation force.

FIG. 5 shows the vibration characteristics of the liquid ring type vibration isolator 10 of the present embodiment provided with the dynamic damper 54 in comparison with the vibration characteristics of the liquid ring type vibration isolation device 200 shown in FIG.
In the figure, the horizontal axis represents the excitation frequency, and the vertical axis represents the absolute spring constant and the damping coefficient.

Here, K represents the absolute spring constant of the liquid ring type vibration isolator 10, and KA represents the absolute spring constant of the liquid ring type vibration isolator 200.
C represents the attenuation coefficient of the liquid ring type vibration isolator 10 according to the present embodiment, and CA represents the attenuation coefficient in the liquid ring type vibration isolation device 200.

As shown in the figure, both the liquid ring type vibration isolator 10 of the present embodiment and the liquid ring type vibration isolator 200 of the conventional example show similar vibration characteristics.
That is, it can be seen that even if the dynamic damper 54 is provided according to the present embodiment, the vibration characteristics are not particularly affected.
However, the vibration characteristic shown in FIG. 5 represents the vibration characteristic in a low frequency vibration region, specifically, in a frequency region around a vibration frequency (about 27 Hz) at idling.

  In both the present embodiment product and the conventional product, the liquid column resonance frequency of the liquid flowing through the orifice channels 43 and 216 is set so as to reduce the vibration at the target idling vibration frequency (about 27 Hz). As a result, the absolute spring constant at 27 Hz is reduced in both the present embodiment product and the conventional product, and vibration transmission at 27 Hz is satisfactorily reduced.

On the other hand, FIG. 6 shows vibration characteristics in a high frequency vibration region that generates a booming noise in the passenger compartment.
As shown in the figure, in the case of the product of the present embodiment, the absolute spring constant K until the resonance occurs due to the dynamic damper 54 resonating at about 140 Hz is the absolute spring constant KA of the comparative example product. Compared to the lower spring.

Further, regarding the attenuation coefficient, the attenuation coefficient C in the product of this embodiment shows a peak of attenuation due to resonance at about 140 Hz as compared with the attenuation coefficient CA of the conventional product.
As a result, in the case of the product of the present embodiment, it is understood that vibration transmission in the high frequency vibration region of the booming noise is satisfactorily reduced, and thus the booming noise can be satisfactorily suppressed by providing the dynamic damper 54 according to the present embodiment.

According to the present embodiment, the original function as the cylindrical portion 42, that is, the orifice channel 43 is formed inside thereof, and the damping function based on the liquid flow in the channel, particularly the damping function due to the liquid column resonance. The function as the dynamic damper 54 can also be given there without losing.
This effectively reduces vibrations in different vibration frequency regions by using the liquid column resonance of the liquid flowing through the orifice channel 43 and the resonance of the dynamic damper 54, specifically, idling of the vehicle. It is possible to effectively reduce the vibration of the time and the vibration in the high-frequency vibration frequency region that causes a booming noise in the passenger compartment.

Further, in the present embodiment, the cylindrical portion (entire) 42 that forms the orifice channel 43 on the inside is configured as the dynamic damper 54, and thus the dynamic damper 54 is configured separately from the cylindrical portion 42. Compared to the case, the internal structure of the liquid seal type vibration isolator 10 can be simplified.
In addition, the dynamic damper 54 can be vibrated using the liquid flow at the portion where the liquid flow is most actively generated.
Further, in the present embodiment, there is an advantage that the frequency of the liquid column resonance can be adjusted by changing the rubber thickness of the rubber spring 50 having a cylindrical shape.

  Furthermore, in this embodiment, the liquid seal type vibration isolator 10 is a suspension type that suspends and supports a vibrating body on the inner metal fitting 12 side, and the inner metal fitting 12 has a cup-shaped portion 18. Since the mass member 52 is inserted into the cup-shaped portion 18, a liquid flow path 56 can be formed between the mass member 52 and the inner metal fitting 12. It is also possible to provide a separate orifice channel to exert its action.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is a longitudinal cross-sectional view of the liquid seal type vibration isolator of one Embodiment of this invention. It is a longitudinal cross-sectional view which decomposes | disassembles and shows the liquid seal type vibration isolator. It is a disassembled perspective view of the liquid seal type vibration isolator. It is a figure showing the vibration characteristic of the dynamic damper single item in the liquid seal type vibration isolator. It is a figure which compares and shows the vibration characteristic of the low frequency vibration area | region of the same liquid seal type vibration isolator with a prior art example product. It is a figure which compares and shows the vibration characteristic of the high frequency vibration area | region of the liquid sealing type vibration isolator with a prior art example product. It is a figure which shows the conventional liquid seal type vibration isolator.

Explanation of symbols

10 Liquid seal type vibration isolator 12 Inner metal fitting (inner member)
14 Outer bracket (outer member)
16 Body rubber part 18 Cup-like part 34 Partition bracket (partition member)
36 Main liquid chamber 38 Sub liquid chamber 42 Cylindrical portion 43 Orifice flow path 46 Rubber elastic body 50 Rubber spring 52 Mass member 54 Dynamic damper 56 Flow path

Claims (2)

(a) a rigid outer member and
(b) a rigid inner member and
(c) a main body rubber portion that connects the outer member and the inner member in the inner and outer directions, and has an annular shape around the inner member;
(d) a liquid chamber formed using the main rubber part as a wall;
(e) a rigid partition member that partitions the liquid chamber into a main liquid chamber on the main rubber part side and a sub liquid chamber on the opposite side;
(f) a cylindrical portion that is provided in the partition member and that forms an orifice channel on the inside that communicates the main liquid chamber and the sub liquid chamber; and through the orifice channel, the main liquid chamber and the sub liquid chamber A liquid-sealed vibration isolator that causes a liquid to flow between the chamber and attenuate, and projects the whole or a part of the cylindrical portion from the partition member side to the main liquid chamber side in the axial direction. A liquid seal type vibration isolator comprising a cylindrical rubber spring having a cylindrical shape and a cylindrical mass member fixed to an axial tip portion of the rubber spring.   2. The vibration isolator according to claim 1, wherein the vibration isolator suspends and supports a vibrating body on the inner member side, and the inner member has a cup-shaped portion, and forms a part of the cylindrical portion. A liquid seal type vibration damping device, wherein a mass member is inserted into the cup-shaped portion, and a liquid flow path is formed between the mass member and the cup-shaped portion.

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