JP2002310222A - Liquid sealed vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reduce the dynamic spring constant in a wide frequency range by a liquid sealed vibration isolator structured to generate plural kinds of diaphragm resonance. SOLUTION: The liquid sealed vibration isolator consists of a cone-shaped mount part with a diaphragm-resonant elastic body part and a cylindrical bush part with a diaphragm-resonant end wall and an elastic partition wall, which are integrally formed with each other. The dynamic spring bottom B1 is generated in the frequency a and the dynamic spring peak P1 is generated in the frequency d on the high frequency side from the diaphragm resonance of the elastic body part in the cone-shaped mount part. Moreover, the dynamic spring peak P1 is generated in the frequency b and the dynamic spring bottom B2 is generated in the frequency c from the diaphragm resonance of the end wall in the cylindrical bush part. In this case, the relation among the frequencies a-d is a<b<c<d. When a liquid is enclosed in the cone-shaped mount part and the cylindrical bush part, curves with the above characteristics are formed, and since the dynamic spring peak P1 is offset by the dynamic spring bottom B1 and the dynamic spring peak P2 is by the dynamic spring bottom B2, the dynamic spring peak is lowered to reduce the dynamic spring constant in a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-sealed vibration isolator used for an engine mount or the like, and relates to a device in which a cylindrical bush and a conical mount are integrated.

[0002]

2. Description of the Related Art A first mounting member mounted on a vibration generating side, a second mounting member mounted on a vibration receiving side, and a substantially conical shape for connecting the first mounting member and the second mounting member. An elastic body member, and a liquid chamber having the elastic body portion as a part of the elastic wall portion is provided inside the elastic body portion, and the liquid chamber is divided into a main liquid chamber and a sub liquid chamber by a partition member. A conical mount in which both fluid chambers are connected by a first orifice passage is known. In addition, a cylindrical bush is known in which cylindrical inner and outer cylinders are connected by an elastic member, a plurality of liquid chambers are circumferentially partitioned by the elastic member, and the liquid chambers are connected by an orifice passage.

Further, the applicant of the present application has filed an application for a liquid seal vibration isolator in which a conical mount is integrated with an elastic wall constituting a part of a liquid chamber of a cylindrical bush and which is common to an elastic main body (see FIG. 1). Japanese Patent Application No. 2000-284387). When integrated in this way, vibrations in two directions perpendicular to each other can be absorbed by the cylindrical bush portion, and vibrations in directions perpendicular to these directions can be absorbed by the conical mount portion. It becomes possible to absorb vibrations in all directions. In addition,
In the following description, the X-axis indicates the vertical direction (the front-rear direction when the vehicle is mounted), the left-right direction (the left-right direction when the vehicle is mounted), and the vertical direction (the same applies when the vehicle is mounted) in FIG. Direction, Y-axis direction, and Z-axis direction.

[0004]

When the cylindrical bush portion and the conical mount portion are integrated as described above, the cylindrical bush portion and the conical mount portion each have a membrane resonance portion. As a whole, the dynamic spring characteristics in the mid-high frequency range are determined by the coupling of each membrane resonance in the cylindrical bush part and the conical mount part. It is difficult to form a minimum value of the spring constant (hereinafter, referred to as a dynamic spring bottom; similarly, a maximum value of the dynamic spring constant is referred to as a dynamic spring peak), and it is desired to make this possible. Therefore,
An object of the present invention is to fulfill such a demand. In addition,
Here, the mid-high frequency range means a frequency range of about 200 to 1000 Hz.

[0005]

According to a first aspect of the present invention, there is provided a liquid seal vibration isolator according to the present invention, comprising a first mounting member mounted on either a vibration generating side or a vibration receiving side. A second attachment member attached to one of the other side vibrators, and a substantially conical elastic body portion connecting the first and second attachment members, and forming the elastic body portion as a part of an elastic wall. The liquid chamber is divided into a main liquid chamber and a sub liquid chamber by a partition member, and a conical mount is provided which connects the main liquid chamber and the sub liquid chamber with a first orifice passage. A plurality of side liquid chambers sharing the elastic body part as a part of the elastic wall are provided on the outer peripheral part of the elastic body part at predetermined intervals in a circumferential direction, and a second orifice is provided between these side liquid chambers. Liquid-sealed vibration isolator provided with a cylindrical bush part by communicating in a passage In the conical mount portion and the cylindrical bush portion, a membrane resonance is generated at different unique frequencies, and a maximum value or a minimum value of a dynamic spring constant generated by the unique film resonance in the conical mount portion. And a maximum value or a minimum value of a dynamic spring constant generated by a unique membrane resonance in the cylindrical bush portion, so as to interfere with each other to obtain a low dynamic spring characteristic.

The unique membrane resonance in the conical mount and the cylindrical bush means that the dynamic spring characteristic is measured by filling the liquid only in the liquid chamber on either side of the conical mount or the cylindrical bush. This is a film resonance having a unique resonance frequency and dynamic spring characteristics required by the above.

According to a second aspect of the present invention, in the first aspect, the cylindrical bush portion forms a maximum value of a dynamic spring constant at a specific frequency by a plurality of membrane resonances, and further has a minimum value at a higher frequency side. And the conical mount generates a membrane resonance that forms a minimum value of the dynamic spring constant near the natural frequency giving the maximum value and at a lower frequency side.

According to a third aspect of the present invention, in the first aspect, the cylindrical bush portion forms a maximum value of a dynamic spring constant by an inherent film resonance, and the conical mount also has a minimum dynamic spring constant by an inherent film resonance. A characteristic frequency at which the local minimum value at the mount side is formed in the vicinity of the specific frequency at which the local maximum value at the bush side is formed and at a higher frequency side. And

According to a fourth aspect of the present invention, in any one of the first to third aspects, an elastic film for absorbing fluctuations in the internal pressure of the main liquid chamber is provided facing the main liquid chamber of the conical mount. Features.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a disk member interlocked with the first mounting portion is provided in the main liquid chamber of the conical mount portion.

[0011]

According to the first invention, the maximum value or the minimum value of the dynamic spring constant generated by the unique membrane resonance in the conical mount portion, and the dynamic spring generated by the unique film resonance in the cylindrical bush portion. Since the maximum value or the minimum value of the constant is coupled so as to interfere with each other, the dynamic spring peak generated by the unique membrane resonance in the cylindrical bush portion or the conical mount portion occurs by the unique membrane resonance on the other side. The spring is lowered at the bottom of the dynamic spring, and as a result, the dynamic spring can be reduced over a wide range of the mid-high frequency range.

According to the second aspect of the present invention, a plurality of membrane resonating portions are provided in the cylindrical bush portion, and a dynamic spring peak at a specific frequency and a dynamic spring bottom at a higher frequency side are provided by each. The resonance forms the dynamic spring bottom at a lower frequency side than the specific frequency of the dynamic spring peak, thereby lowering the dynamic spring peak on the cylindrical bush portion side. In addition, since the dynamic spring peak is generated at a lower frequency side than the dynamic spring bottom of the cylindrical bush portion, the dynamic spring is reduced over a wide frequency range.

According to the third aspect, when the dynamic spring peak due to the inherent membrane resonance in the cylindrical bush portion occurs on a lower frequency side than the dynamic spring bottom due to the inherent membrane resonance in the conical mount portion, the membrane in the conical mount portion. The dynamic spring bottom of the cylindrical bush portion is lowered by the resonant dynamic spring bottom to reduce the dynamic spring.

In addition, since the membrane resonance of the cylindrical bush portion having the dynamic spring peak occurs earlier on the low frequency side than the membrane resonance of the conical mount portion side having the dynamic spring bottom, the membrane on the cylindrical bush portion side can be obtained. In order to reinforce the membrane resonance in the conical mount portion with the resonance energy, the dynamic spring bottom on the conical mount portion side is amplified, and a dynamic spring bottom occurs in the coupled dynamic spring characteristics. Therefore, it is possible to form the dynamic spring bottom at a specific frequency.

According to the fourth aspect of the present invention, in any one of the above-mentioned inventions, the elastic film for absorbing fluctuations in the internal pressure of the main liquid chamber is provided facing the main liquid chamber of the conical mount portion. The dynamic spring characteristics can be further reduced.

According to the fifth aspect of the present invention, in any one of the above-mentioned inventions, the disk member interlocking with the first mounting portion is provided in the main liquid chamber of the conical mount portion. Vibrates in the main liquid chamber to generate liquid column resonance, and is coupled with the membrane resonance of the elastic body, thereby further lowering the dynamic spring in the mid-high frequency range. It is characterized by the following.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an engine mount of a vehicle according to an embodiment of the present invention; FIG. 1 is a plan view showing the engine mount from the upper side when the vehicle body is mounted in the Z-axis direction. FIG. 2 is a cross-sectional view (a cross-sectional view taken along line 2-2 in FIG. 1) of the entirety. And FIG. 4 is a perspective view of the insert in which the first mounting portion and the elastic member are integrated. In the following description, the vertical direction (the front-rear direction when the vehicle is mounted) of FIG. 1 is the X-axis direction, and the left-right direction (the horizontal direction when the vehicle is mounted) is the Y-axis direction. The vertical direction in FIG. 2 (the same applies when the vehicle is mounted) is defined as the Z-axis direction.

In these figures, this engine mount is formed by integrally forming a conical mount portion 1 and a cylindrical bush portion 2, and the conical mount portion 1 is a first mounting member mounted on the engine side. 3, a second mounting member 5 configured as a rigid cylindrical outer frame surrounding the periphery thereof at intervals, and a substantially cone connecting between the first mounting member 3 and the second mounting member 5 It has an elastic main body 7 in a shape of a circle. One end of a stopper 4 having a substantially L-shaped cross section is mounted on the first mounting member 3. The vehicle body side bracket 6 attached to the vehicle body side is welded to the second mounting member 5.

The first mounting member 3 has an axial direction Z which is the main vibration input direction in the conical mount 1.
The portion buried in the elastic main body 7 coincides with the axial direction and has a columnar shape. The diameter of the portion below the step provided at the top is reduced, and the length is extended along the Z-axis direction. A portion of the first mounting member 3 protruding from the elastic body 7 forms a flat portion and is connected to the stopper 4.

The substantially conical space formed by the elastic body 7 forms a liquid chamber, and is opened downward in FIGS. 2 and 3. A partition member 8 and a diaphragm 9 are attached to the opening, and the elastic body 7 A main liquid chamber 10 having the elastic body 7 as a part of the elastic wall between the inner wall and the partition member 8, a sub liquid chamber 11 between the partition member 8 and the diaphragm 9, and a liquid chamber mainly formed by the partition member 8. A liquid chamber 10 and a sub liquid chamber 11 are defined.

The partitioning member 8 is composed of a resin-made cylindrical portion 12 made of a suitable resin and a pressing plate 13 having a smaller diameter and overlapping the surface of the sub-liquid chamber 11, and a partition between the cylindrical portion 12 and the pressing plate 13. One orifice passage 15 is formed, and the main liquid chamber 10 and the sub liquid chamber 11 are always in communication with each other to function as a damping orifice for absorbing vibration in a low-amplitude low-frequency region during normal traveling of the vehicle.

The elastic body portion 7 and the end wall and the elastic partition wall, which will be described later, forming the conical mount portion 1 and the cylindrical bush portion 2 are all integrally formed of the same single elastic member. A single insert 17 (FIG. 4) is formed integrally with the material and the first mounting portion 3, and a pocket portion 18 is provided on the side surface of the insert portion 17 so as to be opened to the side. The liquid chamber space of the section 2 is formed.

The cylindrical bush portion 2 has a plurality of side liquid chambers 20 each of which has an outer wall as a part of the elastic wall on the outer periphery of the elastic body portion 7. The side liquid chamber 20 has a substantially triangular space having a cross section as shown, which is opened laterally, and is formed integrally with the elastic main body 7 and fits into an end wall 21 and a side opening which expand substantially in the horizontal direction. It is hermetically sealed with the liquid chamber cover 22 made of resin to be combined.

The liquid chamber cover 22 is in close contact with the inner peripheral surface of the second mounting member 5 in an arc shape with a width of about 1/4 circumference. A groove 23 extending in the circumferential direction is provided on a surface of the liquid chamber cover 22 that contacts the second mounting member 5 (hereinafter, referred to as an outer surface), and is opened toward the second mounting member 5. The second between
Orifice passage 24 is formed. The second orifice passage 24 is formed in the circumferential direction along the inner surface of the second mounting member 5, always communicates between the pair of side liquid chambers 20, 20, and communicates with the first orifice passage 15. It functions as a similar damping orifice.

Further, a concave chamber 25 is formed in the cylindrical bush 2 adjacent to the side liquid chamber 20. As shown in FIG. 1, the cylindrical bush portion 2 is provided on the outer periphery of the elastic main body portion 7 in a circumferential direction with a side liquid chamber 20 and a bulging portion 25 adjacent thereto.
Are formed at 90 ° intervals, and the pair of side liquid chambers 20, 20 and the bulges 25, 25 are located on the opposite side at 180 ° intervals from the center. The pair of side liquid chambers 20 and 20 are arranged on the X-axis which is the main vibration input direction in the cylindrical bush portion 2.

The burring section 25 is opened upward in FIG.
It is surrounded by an elastic part composed of a thin part 26, an elastic partition wall 27 and a side wall 28. The thin portion 26 forms a bottom portion of the bulging portion 25 to partition between the main liquid chamber 10 and a part of the elastic body portion 7 which is specially thinned to form a thin portion. It is set so that membrane resonance is generated by vibration input in the medium frequency range.

As shown in FIG. 3, the elastic partition walls 27 partition between the side liquid chambers 20 and are formed in the respective radial directions, and each of the elastic partition walls 27 has the same thin film elasticity as the thin wall portion 26. It is formed as a wall. The side wall 28 is in close contact with the inner surface of the second mounting member 5 and
6 and the elastic partition wall 27 are formed continuously and integrally. A groove 29 similar to the groove 23 is formed on the outer surface of the side wall 28 (FIG. 4), and forms a part of the second orifice passage 24.

As shown in FIG. 3, the distal end of the elastic main body 7 and one end of the side wall 28 form an enlarged portion 30, into which a ring 31 having a U-shaped cross section is embedded and integrated. Only the lower surface of the ring 31 is exposed and abutted against the upper surface of the partition member 8 for positioning. The enlarged portion 30 is tightly sealed to the inner surface of the second mounting member 5 and the lower end of the liquid chamber cover 22.

A ring 32 having a substantially S-shaped cross section is embedded and integrated also at the upper end sides of the end wall 21 and the side wall 28, and is fixed by a caulking portion 33 in which the upper end of the second mounting member 5 is bent inward. Have been. End wall 21, thin wall 26, elastic partition 2
7. The side wall 28 and the enlarged portion 30 are all continuously and integrally formed of the same single elastic member as the elastic main body 7.

A portion of the second mounting member 5 below the partition member 8 is formed with an inwardly folded portion 35, and the outer peripheral edge of the partition member 8 is fixed between the rings 31. . A further inner end 36 of the folded portion 35 is folded downward to form an annular wall, inside of which an operation space for the diaphragm 9 is secured.

A receiving member 37 having a substantially U-shaped cross section is welded to the outer surface of the second mounting member 5 in the middle in the vertical direction in the figure, and an excessive load is input to the first mounting member 3 side. When
The end of the stopper 4 that moves downward is abutted and received.

To assemble this engine mount,
The diaphragm 9 is put into the inside of the second mounting member 5, and the outer peripheral portion thereof is placed on the folded portion 35, the partition member 8 is put into the second mounting member 5, and the outer peripheral portion of the cylindrical portion 12 is moved to the diaphragm. The outer peripheral portion of the diaphragm 9 is sandwiched between the outer peripheral portion of the partition member 8 and the folded portion 35 by overlapping the enlarged portion formed on the outer periphery of the diaphragm 9.

Subsequently, the elastic molded body 34 is connected to the second mounting member 5.
Put in. At this time, the side opening of the side liquid chamber 20 is closed with the liquid chamber cover 22 in advance. The ring 30 of the elastic molded body 19 is superimposed on the outer peripheral portion of the partition member 8 superimposed on the outer peripheral portion of the folded portion 35, and the upper end 5a of the second mounting member 5
Is bent inward to form a caulked portion 33, and the caulked portion 3
The ring 32 is fixed by 3. At this time, the outer peripheral portion of the partition member 8 is fixed and sealed by the outer peripheral portion of the diaphragm 9 sandwiched between the ring 30 and the folded portion 35. In this assembly process, an incompressible liquid is sealed in the main liquid chamber 9, the sub liquid chamber 10, and the side liquid chamber 20 by a known method.

Next, the operation of this embodiment will be described. If the main vibration input direction of the conical mount portion 1 is arranged so as to be in the Z-axis direction and the main vibration input direction of the cylindrical bush portion 2 is in the X-axis direction, the vibration in the Z-axis direction will be conical mount portion 1.
The attenuation is increased by the liquid column resonance of the first orifice passage 15 at the time of (1). Further, with respect to the vibration in the X-axis direction, the liquid moves through the second orifice passage 24 between the front and rear side liquid chambers 20 when the vehicle body is mounted, thereby causing liquid column resonance to be generated and the damping is increased. .

Further, by providing the thin portion 26, the thin portion 26 undergoes film resonance at a frequency in a specific medium frequency region, and the film resonance causes a low dynamic spring in a specific medium frequency region. Can be absorbed in XZ directions. Therefore, the vibrations in the X and Z-axis directions can be reduced based on the liquid flow between the liquid chambers, and the dynamic spring can be reduced by the membrane resonance in the medium frequency region, and can be efficiently reduced simultaneously by a single device.

FIG. 12 is a graph showing the dynamic spring characteristics of the present embodiment. The vertical axis represents the dynamic spring constant, the horizontal axis represents the frequency of the input vibration, and the characteristic curve of the present embodiment and the conical mount 1 as a reference. The characteristic curve when the liquid is sealed only in the liquid and the characteristic curve when the liquid is sealed only in the cylindrical bush portion 2 are also shown.

First, when the liquid is sealed only in the conical mount portion 1, as shown by the characteristic curve, the dynamic spring bottom B1 is generated at the frequency a by the membrane resonance in the thin portion 26 of the elastic main body portion 7, and thereafter, relatively. At a high frequency d, a dynamic spring peak P2 due to the film resonance of the thick portion 7 is generated. Also,
When the liquid is sealed only in the cylindrical bush part 2, as shown in the characteristic curve, the dynamic spring peak P1 due to the membrane resonance of the end wall 21 at the frequency b and the frequency c higher than the frequency c and lower than the frequency d Then, a dynamic spring bottom B2 is generated by the membrane resonance of the elastic partition wall 27. Note that a <b <c
It is assumed that the frequency increases in the order of <d.

On the other hand, in the present embodiment, the liquid is sealed in each of the liquid chambers of the conical mount portion 1 and the cylindrical bush portion 2 and used. Therefore, the characteristics are the same as those characteristic curves and a characteristic curve obtained by coupling these characteristics. Become. In this case, by setting the dynamic spring bottom B1 to be generated at a frequency lower than the dynamic spring peak P1, the characteristic curve between the frequencies ab becomes a relatively flat one in which the dynamic spring peak P1 and the dynamic spring bottom B1 are averaged. Thus, the lower the dynamic spring peak P1, the lower the dynamic spring.

Further, by generating the dynamic spring bottom B2 of the characteristic curve at a frequency c lower than the frequency d of the dynamic spring peak P2, the dynamic spring peak P2 is also depressed, and the characteristic curve and the dynamic spring bottom B descend after passing the dynamic spring peak P1. On the lower frequency side than the intersection e of the characteristic curve rising after B1, the dynamic spring constant is lower than the characteristic curve,
On the high frequency side, the dynamic spring constant is set lower than the characteristic curve.

Therefore, a wide frequency range from the dynamic spring peak P1 frequency b to the frequency d of the dynamic spring peak P2 on the high frequency side can be reduced to a low dynamic spring. Can be sufficiently reduced. In addition, in this embodiment, the dynamic spring becomes extremely low even on the higher frequency side than the frequency d, so that the performance more than required can be exhibited.

Next, a second embodiment will be described. FIG. 5 is a plan view of the insert of the present embodiment, FIG. 6 is a sectional view taken along line 6-6 of FIG.
FIG. 7 is a sectional view taken along line 7-7 of FIG. This embodiment is different from the previous embodiment only in a part of the structure such as the interpolating body, and the other portions are common to the previous embodiment. Therefore, the description of these portions is omitted and is common to the previous embodiment. Common parts are used for parts.

The insert 17 of this embodiment is characterized in that only the elastic partition wall 27 has a solid structure without any bulge. That is, the elastic partition wall 27 is different from the previous embodiment,
As shown in FIG. 7, the pocket portion 18 extends in the opposite direction on the Y axis at an interval of 180 ° with respect to the center portion, and has a substantially semicircular pocket section 18 in a plane cross section.

The distal end portion 40 projects slightly in the radial direction from the inner diameter of the second mounting portion 5, and the connection end portion 41 of the liquid chamber cover 22 covering the pocket portion 18 is overlapped with the distal end portion 40 to form the second end portion. When it is press-fitted into the mounting portion 5, the elastic partition wall 27 is compressed inward, and the insert 18 closely fits into the second mounting portion 5. Thereby, the liquid chamber cover 22 is in close contact with the inner surface of the second mounting portion 5 to cover the pocket portion 18 in a liquid-tight manner.
The seat 42 is also in close contact with the tip 40, so that the tip 40
Thereby, the connection end 41 is liquid-tightly sealed.

The liquid chamber cover 22 is in close contact with the inner peripheral surface of the second mounting member 5 in an arc shape with a width of about 1/2 circle. A groove serving as a second orifice passage 24 is formed on the outer surface of the liquid chamber cover 22 as in the previous embodiment, and the front and rear side liquid chambers 20 formed by covering the front and rear pocket portions 18 with the liquid chamber cover 22. There is communication between them.

The upper part of the elastic partition wall 27 is formed integrally with the elastic main body part 7 and extends in the substantially horizontal direction.
1 and the lower part also continues to the elastic body 7. The elastic partition wall 27 is formed as a thin elastic wall having the same membrane resonance characteristics as the elastic main body 7.

Next, the operation of this embodiment will be described. Similarly to the previous embodiment, the cylindrical bush portion 2 in the present embodiment also receives the front and rear side liquid chambers 2 with respect to the vibration input in the front and rear direction (X-axis direction).
By flowing the liquid through the second orifice passage between 0, the liquid can be damped by utilizing the liquid column resonance.

The vibration in the left-right direction is generated by the elastic partition wall 27.
It can be absorbed by the spring elasticity. At this time, the elastic partition wall 27 has a solid shape without a bulge, and the end wall 21 is formed so as to form a single disk as a whole, and the elastic partition wall 27 is compressed toward the center during assembly. Therefore, the spring value in the left-right direction can be increased.

Further, as in the previous embodiment, the vibration can be efficiently absorbed by utilizing the respective membrane resonances of the elastic main body 7, end wall 21 and elastic partition wall 27. FIG. 13 is a graph similar to FIG. 12 showing the dynamic spring characteristics of the present embodiment. The characteristic curve of the present embodiment, the characteristic curve when a liquid is sealed only in the conical mount portion 1 and the cylindrical bush as a reference. A characteristic curve when a liquid is sealed only in the part 2 is also shown.

First, when the liquid is sealed only in the cylindrical bush part 2, as shown by the characteristic curve, a dynamic spring peak P3 due to the membrane resonance of the end wall 21 is generated at the frequency f, and the higher frequency side is obtained. Further, an anti-resonant dynamic spring bottom is generated at a frequency higher than the frequency f. The elastic partition 2
7 has no membrane resonance because the front and rear are in the liquid.

When the liquid is sealed only in the conical mount portion 1, a dynamic spring bottom B4 is generated at the frequency h higher than the frequency f by the membrane resonance in the elastic body portion 7 as shown in the characteristic curve. This frequency h is slightly lower than the frequency at which the dynamic spring bottom occurs due to anti-resonance in the characteristic curve, and the dynamic spring constant increases as the frequency increases due to anti-resonance.

In this embodiment, a characteristic curve obtained by coupling these characteristic curves and the characteristic curve is obtained. In this case, the dynamic spring bottom B
By setting the frequency 4 to occur at a frequency h higher than the frequency f of the dynamic spring peak P3, the dynamic spring peak P3 is lowered and a low dynamic spring is obtained.

In addition, the dynamic spring bottom B3 occurs at the frequency g between the frequencies f and h. Here, the relationship between the frequencies is such that the frequencies increase in the order of f <g <h. The dynamic spring bottom B3 results from the dynamic spring bottom B4 being amplified by the membrane resonance on the cylindrical bush part side. That is, since the membrane resonance on the cylindrical bush portion side where the dynamic spring peak P3 has occurred first on the low frequency side is applied to the membrane resonance on the conical mount portion side which subsequently occurs on the high frequency side, the dynamic spring bottom B4 is amplified. As a result, a dynamic spring bottom B3 is generated as the coupled dynamic spring characteristic.

Therefore, according to this example, it is possible to form the dynamic spring bottom at a specific frequency in the overall dynamic spring characteristics, and thus various tunings can be realized.

FIG. 8 is a sectional view similar to FIG. 2 according to the third embodiment. In this embodiment, the same insert as that of the first embodiment is used, and the partition member 8 is provided with the elastic film 50 so that the main liquid chamber 10 is formed.
The internal pressure rise is absorbed. That is, a through hole 52 is provided in an upper wall 51 formed on the upper portion of the cylindrical portion 12, and the elastic film 5 is provided between the upper wall 51 and the holding plate 13.
The reference numeral 0 is provided so that its periphery is fixed and elastically deformable in accordance with the liquid pressure of the main liquid chamber 10, thereby absorbing the internal pressure of the main liquid chamber 10.

The first orifice passage 15 is formed in each of the outer peripheral portions of the cylindrical portion 12 and the holding plate 13, and communicates the main liquid chamber 10 and the sub liquid chamber 11. A ring 31 having a U-shaped cross section is embedded and integrated at the tip of the elastic main body 7. The ring 31 is positioned such that only the lower surface thereof is exposed and abuts on a step portion 53 formed on the outer periphery of the cylindrical portion 12 constituting the partition member 8.
The distal end of the elastic body 7 is tightly sealed to the inner surface of the liquid crystal panel and the lower end of the liquid chamber cover 22. A ring 32 is also embedded and integrated with the outer peripheral portion of the end wall 21, and is fixed by a caulking portion 33 in which the upper end of the second mounting member 5 is bent inward.

The lower portion of the second mounting member 5 below the partition member 8 forms a small-diameter portion 54, and the partition member 8 is connected to a step 55 formed at the boundary between the small-diameter portion 54 and the upper portion thereof.
A ring 31 provided on the outer peripheral portion of the vehicle is mounted. The liquid chamber cover 22 is interposed between the upper and lower rings 31 and 32 and is fixed by the upper caulking portion 33. On the small diameter portion 54 side, the cylindrical portion 12 and the holding plate 13 are overlapped under the ring 31, and the enlarged portion formed on the outer periphery of the diaphragm 9 is further overlapped on the lower end portion of the holding plate 13 to form a caulking portion 55. It is integrated.

In this manner, in the conical mount portion 1, damping due to liquid column resonance in the first orifice passage 15 and film resonance in the thin film portion 26 can be expected in the same manner as in the above-described embodiments, and large vibrations occur in the Z-axis direction. Is input, the elastic film 50 is elastically deformed and absorbs an increase in the internal pressure in the main liquid chamber 10, so that the conical mount portion 1 further becomes a low dynamic spring.

FIG. 14 is a graph showing the dynamic spring characteristics. The vertical axis shows the dynamic spring constant, and the horizontal axis shows the frequency. The solid line in the figure is a characteristic curve showing the dynamic spring constant change of the present embodiment,
A broken line is a characteristic curve of a comparative example in which the elastic film 50 is omitted from the present embodiment, that is, a characteristic curve corresponding to the first embodiment. As is apparent from this graph, in the present embodiment, the presence of the elastic film 50 can further reduce the overall dynamic spring.

FIG. 9 is a sectional view similar to FIG. 8 according to the fourth embodiment. The insert 17 has the same structure as that of the second embodiment and further has the elastic film 50 of the third embodiment. is there. In this example, the distal end side of the elastic partition wall 27 on the radially outward side of the cylindrical bush portion 2 is fitted and fixed to the liquid chamber cover 22.

FIG. 10 is an enlarged cross-sectional view (a cross section corresponding to line 10-10 in FIG. 9) showing this portion.
7, the connecting ends 41 of the pair of liquid chamber covers 22 are overlapped with each other, and in this example, a protruding portion 43 that protrudes from the seat 42 and fits the front end 40 of the elastic partition wall 27. And the inner surface 44 of the protruding portion 43 is tapered so as to form a taper angle α such that the space formed between the elastic partition walls 27 gradually narrows outward.

In this way, when the elastic partition wall 27 is elastically deformed in the front-rear direction, the spring value is set so that the amount of elastic deformation can be increased for small vibrations. When the spring comes into contact with the inner surface, the spring value can be changed non-linearly by restricting further elastic deformation and increasing the spring value. The spring value at the time of large vibration can be arbitrarily set by adjusting the taper angle of the inner surface 44 and the amount of inward projection.

The conical mount 1 made of the elastic film 50
And the spring value of the elastic partition wall 27 in the cylindrical bush portion 2 is changed in a non-linear manner, so that a low dynamic spring as a whole against small vibrations can be realized. FIG. 15 is a graph showing the dynamic spring characteristics. The vertical axis shows the dynamic spring constant, and the horizontal axis shows the frequency. The solid line in the figure is a characteristic curve showing the dynamic spring constant change of the present embodiment, and the broken line is a comparative example in which the above-mentioned fixing structure of the elastic film 50 and the elastic partition wall 27 is removed from the present embodiment, that is, the second embodiment. It is the characteristic curve of the equivalent. As is clear from this graph, in this embodiment, the whole can be further reduced in dynamic spring.

FIG. 11 is a view similar to FIG. 8 according to the fifth embodiment. However, the insert in the second embodiment is applied. In this example, the lower end portion 60 of the first attachment member 3 is projected into the main liquid chamber 10, and an umbrella-shaped disk member 61 is attached to the projected end by caulking or the like. Disk member 61
Is a known member for absorbing medium-high frequency vibration, and vibrates integrally with the first mounting member 3 in the main liquid chamber 10. Also,
A first orifice passage 15 is provided in the partition member 8,
The main liquid chamber 10 communicates with the sub liquid chamber 11.

FIG. 16 is a graph showing the dynamic spring characteristics. The vertical axis shows the dynamic spring constant, and the horizontal axis shows the frequency. The solid line in the figure is a characteristic curve showing the dynamic spring constant change of the present embodiment,
The broken line is a comparative example in which the disk member 61 is omitted from the present embodiment,
That is, it is a characteristic curve corresponding to that of the second embodiment.
As is clear from this graph, when the disk member 61 is missing, the thin elastic body 7 generates a dynamic spring bottom B5 near 500 Hz, which is a middle and high frequency range, and the anti-resonance rises sharply on the high frequency side. However, since the dynamic spring bottom B6 shifts to a higher frequency side due to the coupled resonance of the disk member 61, the dynamic spring can be reduced to a high frequency side exceeding 500 Hz.

The present invention is not limited to the above embodiments, and various modifications and applications are possible within the principle of the present invention. For example, the present invention is also effective in a liquid-sealed vibration isolator having only the cylindrical bush portion 2 without the conical mount portion 1. In this case, in the use state as in each of the above-described embodiments, the front-back and left-right directions are two. The spring ratio in the direction can be controlled.

The arrangement of the cylindrical bush portion 2 can be arbitrarily set. For example, the cross-sectional direction of the elastic partition wall 27 in FIG.
In this case, the spring ratio naturally differs from the above.

[Brief description of the drawings]

FIG. 1 is a plan view of an engine mount according to a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a plan view of an interpolating body.

FIG. 5 is a plan view of an insert according to a second embodiment.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is a sectional view corresponding to FIG. 2 according to a third embodiment.

FIG. 9 is a view corresponding to FIG. 6 according to a fourth embodiment.

FIG. 10 is a sectional view corresponding to line 10-10 in FIG. 9;

FIG. 11 is a view corresponding to FIG. 6 according to a fifth embodiment.

FIG. 12 is a graph showing the operation and effect of the first embodiment.

FIG. 13 is a graph showing the operation and effect of the second embodiment.

FIG. 14 is a graph showing the operation and effect of the third embodiment.

FIG. 15 is a graph showing the operation and effect of the fourth embodiment.

FIG. 16 is a graph showing the operation and effect of the fifth embodiment.

[Explanation of symbols]

1: conical mount, 2: cylindrical bush, 3: first mounting member, 5: second mounting member, 7: elastic body,
8: partition member, 10: main liquid chamber, 11: sub liquid chamber, 15:
First orifice passage, 17: insert, 20: side liquid chamber, 21: end wall, 22: liquid chamber cover, 24: second orifice passage, 25: bulge, 27: elastic partition wall, 4
0: tip, 41: connection end, 42: seat, 50: elastic membrane, 61: disk member

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission Date] October 16, 2001 (2001.10.
16)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to a first aspect of the present invention, there is provided a liquid seal vibration isolator according to the present invention, comprising a first mounting member mounted on either a vibration generating side or a vibration receiving side. A second attachment member attached to one of the other sides, and a substantially conical elastic body portion connecting the first and second attachment members, the elastic body portion being part of an elastic wall. A liquid chamber is provided, and the inside of the liquid chamber is divided into a main liquid chamber and a sub liquid chamber by a partition member, and a conical mount portion connecting the main liquid chamber and the sub liquid chamber with a first orifice passage is provided. A plurality of side liquid chambers sharing the elastic body part as a part of the elastic wall are provided at predetermined intervals in a circumferential direction on an outer peripheral portion of the elastic body part, and a second orifice passage is provided between the side liquid chambers. To the liquid ring vibration isolator with a cylindrical bushing. In addition, the conical mount portion and the cylindrical bush portion generate membrane resonance at different unique frequencies, respectively, and a maximum value or a minimum value of a dynamic spring constant generated by the unique film resonance in the conical mount portion. In addition, a maximum value or a minimum value of a dynamic spring constant generated by a unique membrane resonance in the cylindrical bush portion is coupled so as to interfere with each other to obtain a low dynamic spring characteristic.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

Further, the cylindrical bush portion 2 is formed with a burring portion 25 adjacent to the side liquid chamber 20. As shown in FIG. 1, the cylindrical bush portion 2 is provided on the outer periphery of the elastic main body portion 7 in the circumferential direction with the side liquid chamber 20 and the bulging portion 2 adjacent thereto.
5 are formed at 90 ° intervals, each having a total of two chambers, and the paired side liquid chambers 20, 20 and the bulges 25, 25 are located on opposite sides at 180 ° intervals from the center. The pair of side liquid chambers 20 and 20 are arranged on the X-axis which is the main vibration input direction in the cylindrical bush portion 2.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

As shown in FIG. 2 , the distal end of the elastic main body 7 and one end of the side wall 28 form an enlarged portion 30, into which a ring 31 having a U-shaped cross section is embedded and integrated. Only the lower surface of the ring 31 is exposed and abutted against the upper surface of the partition member 8 for positioning. The enlarged portion 30 is tightly sealed to the inner surface of the second mounting member 5 and the lower end of the liquid chamber cover 22.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

To assemble this engine mount,
The diaphragm 9 is put into the inside of the second mounting member 5, and its outer peripheral portion is placed on the folded portion 35, the partition member 8 is put into the second mounting member 5, and the outer peripheral portion of the cylindrical portion 12 is put on the outer peripheral Layer on the enlarged part formed in the diaphragm 9
Is sandwiched between the outer peripheral portion of the partition member 8 and the folded portion 35.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction contents]

Subsequently , the insert 17 is inserted into the second mounting member 5. At this time, the side opening of the side liquid chamber 20 is closed with the liquid chamber cover 22 in advance. Overlapping the outer peripheral portion of the partition member 8 which is overlaid on the outer peripheral portion of the elastic molded body 34 ring 30 the folded portion 35 of the caulking portion 33 by bending the upper end of the second mounting member 5 inwardly caulking The ring 32 is fixed by the part 33. At this time, the outer peripheral portion of the partition member 8 is fixed and sealed by the outer peripheral portion of the diaphragm 9 sandwiched between the ring 31 and the folded portion 35. In this assembly process, the main liquid chamber 10 , the sub liquid chamber 11 ,
An incompressible liquid is sealed in the side liquid chamber 20 by a known method.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

FIG. 12 is a graph showing dynamic spring characteristics of this embodiment.
The vertical axis represents the dynamic spring constant, and the horizontal axis represents the frequency of the input vibration.
And the characteristic curve of this example and the cone
Characteristic curve when liquid is sealed only in the contact part 1 PassingAndCircle
Characteristic curve when liquid is sealed only in cylindrical bush part 2
Is also indicated.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0037

[Correction method] Change

[Correction contents]

First, liquid is sealed only in the conical mount 1.
If you do, the characteristic curve As shown in the figure, elasticity at frequency a
Dynamic spring bottom due to membrane resonance in the thin portion 26 of the main body 7
B1 and then at a relatively high frequency d
7, a dynamic spring peak P2 due to the membrane resonance is generated. Also,
When liquid is sealed only in the cylindrical bush part 2, the characteristics
curve As shown in FIG.
Dynamic spring peak P1 and higher frequency side and circumference
Film resonance of the elastic partition wall 27 at a frequency c lower than the wave number d
To generate a dynamic spring bottom B2. Note that a <b <c
It is assumed that the frequency increases in the order of <d.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction contents]

Next, a second embodiment will be described. FIG. 5 is a plan view of the insert of the present embodiment, FIG. 6 is a sectional view taken along line 6-6 of FIG.
7 is a sectional view taken along line 7-7 of FIG. This embodiment is different from the previous embodiment only in a part of the structure such as the interpolating body, and the other portions are common to the previous embodiment. Therefore, the description of these portions is omitted and is common to the previous embodiment. Common parts are used for parts.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction contents]

The distal end portion 40 projects slightly in the radial direction from the inner diameter of the second mounting portion 5, and the connection end portion 41 of the liquid chamber cover 22 covering the pocket portion 18 is overlapped with the distal end portion 40 to form the second end portion. When the elastic partition wall 27 is pressed into the mounting portion 5, the elastic partition wall 27 is compressed inward, and the insert 17 is tightly fitted into the second mounting portion 5. Thereby, the liquid chamber cover 22 is in close contact with the inner surface of the second mounting portion 5 to cover the pocket portion 18 in a liquid-tight manner.
The seat 42 is also in close contact with the tip 40, so that the tip 40
Thereby, the connection end 41 is liquid-tightly sealed.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction contents]

FIG. 8 is a sectional view similar to FIG. 2 according to the third embodiment. In this embodiment, the main liquid chamber with the same inner interposer with the first embodiment, and the elastic membrane 50 in the partition member 8 provided 1
The internal pressure rise of 0 is absorbed. That is,
A through hole 52 is provided in an upper wall 51 formed on the upper portion of the cylindrical portion 12, and an elastic film 50 is provided between the upper wall 51 and the holding plate 13, and the periphery thereof is fixed and the elastic film 50 is fixed according to the liquid pressure of the main liquid chamber 10. It is provided so as to be elastically deformable, thereby absorbing the internal pressure of the main liquid chamber 10.

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0057

[Correction method] Change

[Correction contents]

[0057] Thus, the conical mounting portion 1, with a membrane resonance by the damping and the thin film portion 26 by the liquid column resonance in the first orifice passage 15 can be expected the similar each example, large from the Z-axis direction When a vibration is input, the elastic film 50 is elastically deformed and absorbs an increase in the internal pressure in the main liquid chamber 10, so that the conical mount portion 1 further becomes a low dynamic spring.

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a plan view of an engine mount according to a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a perspective view of an insert.

FIG. 5 is a plan view of an insert according to a second embodiment.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is a sectional view corresponding to FIG. 2 according to a third embodiment.

FIG. 9 is a view corresponding to FIG. 8 according to a fourth embodiment.

FIG. 10 is a sectional view corresponding to line 10-10 in FIG. 9;

FIG. 11 is a view corresponding to FIG. 8 according to a fifth embodiment.

FIG. 12 is a graph showing the operation and effect of the first embodiment.

FIG. 13 is a graph showing the operation and effect of the second embodiment.

FIG. 14 is a graph showing the operation and effect of the third embodiment.

FIG. 15 is a graph showing the operation and effect of the fourth embodiment.

FIG. 16 is a graph showing the operation and effect of the fifth embodiment.

[Description of Signs] 1: Conical mount portion, 2: Cylindrical bush portion, 3: First mounting member, 5: Second mounting member, 7: Elastic body portion,
8: partition member, 10: main liquid chamber, 11: sub liquid chamber, 15:
First orifice passage, 17: insert, 20: side liquid chamber, 21: end wall, 22: liquid chamber cover, 24: second orifice passage, 25: bulge, 27: elastic partition wall, 4
0: tip, 41: connection end, 42: seat, 50: elastic membrane, 61: disk member

[Procedure amendment 14]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

[Procedure amendment 15]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

[Procedure amendment 16]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 17]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 13

[Procedure amendment 18]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 14

[Procedure amendment 19]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 20]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 16

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D035 CA05 CA43 3J047 AA04 CA06 CB05 DA02 FA02

Claims (5)

[Claims] 1. A first mounting member mounted on either the vibration generating side or the vibration receiving side, a second mounting member mounted on one of the other side vibrations, and the first and second mounting members. And a substantially conical elastic body portion for connecting the elastic body portion, and a liquid chamber having the elastic body portion as a part of an elastic wall is provided,
The interior of the liquid chamber is divided into a main liquid chamber and a sub liquid chamber by a partition member, and a conical mount portion that connects the main liquid chamber and the sub liquid chamber with a first orifice passage is provided. A plurality of side liquid chambers sharing the elastic body part as a part of the elastic wall are provided on the outer peripheral portion at predetermined intervals in the circumferential direction, and the side liquid chambers are connected to each other by a second orifice passage to form a cylinder. In the liquid ring vibration isolator provided with the mold bush portion, the conical mount portion and the cylindrical bush portion generate membrane resonance at different unique frequencies, respectively, and generate the membrane resonance by the unique membrane resonance in the conical mount portion. The maximum value or the minimum value of the dynamic spring constant and the maximum value or the minimum value of the dynamic spring constant generated by the inherent membrane resonance in the cylindrical bush portion are coupled so as to interfere with each other so that the low dynamic spring characteristic is obtained. Get Liquid sealed vibration isolating device comprising and. 2. The cylindrical bush portion forms a maximum value of a dynamic spring constant at a unique frequency by a plurality of membrane resonances,
Further, a minimum value is formed on a higher frequency side, and the conical mount section generates a film resonance that forms a minimum value of a dynamic spring constant near a natural frequency giving the maximum value and on a lower frequency side. The liquid-sealed vibration isolator according to claim 1, wherein: 3. The cylindrical bush portion forms a maximum value of a dynamic spring constant by a unique membrane resonance, and the conical mount portion also forms a minimum value of a dynamic spring constant by a unique film resonance. The liquid according to claim 1, wherein a natural frequency at which a minimum value on the mount side is formed near the higher frequency side with respect to a specific frequency at which a local maximum value is formed. Sealed vibration isolator. 4. An apparatus according to claim 1, wherein an elastic film for absorbing fluctuations in the internal pressure of the main liquid chamber is provided facing the main liquid chamber of the conical mount. Liquid ring vibration isolator. 5. The liquid ring vibration isolator according to claim 1, wherein a disk member is provided in the main liquid chamber of the conical mount portion so as to interlock with the first mounting portion. .