JP2005133846A - Liquid sealed-vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize low dynamic spring and high attenuation by distinguishing non-linear characteristic of spring constant in an elastic partitioning member in a liquid sealed-vibration control device provided with an elastic partitioning member faced to a main liquid chamber and absorbing the internal pressure. <P>SOLUTION: The elastic partitioning member 12 faced to the main liquid chamber 5 is mounted on a partitioning member 4 defining the main liquid chamber 5 and a sub-liquid chamber 6. The elastic partitioning member 20 integrally has a central thick part 20, thickest deformation control parts 21 formed around the central thick part 20 with an approximately mountain-shaped cross-section and projected in the vertical direction, thinnest main deformation parts 22 formed on outer peripheries of the deformation control parts, and mounting parts 23 further mounted on outer peripheries of the thinnest main deformation parts 22, and rigid rings 24 are integrated with base parts 21a of the deformation control parts 21 and metallic outer rings 25 are integrated with outer peripheral-side parts of the mounting parts 23. The deformation control parts 21 have projecting parts 26 on their tips to be fitted to deformation control recessed parts 27, 30, and the projecting parts are elastically deformed in the deformation control recessed parts 27, 30 in accompany with the rise of internal pressure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid seal vibration isolator used for an engine mount or the like, and more particularly to a device provided with an elastic partition member.

It is publicly known to provide an elastic partition member in the liquid chamber, and it is well known that a nonlinear spring characteristic is obtained or a projection-shaped deformation restricting portion that protrudes in the vibration direction.
JP-A-7-71508 JP 2002-310223 A

  The elastic partition member can realize a low dynamic spring by absorbing the internal pressure, but it is difficult to obtain high damping. Therefore, it is desirable to give a remarkable deformation restricting portion to the elastic partition member. It is also desired that the sound generated by the elastic partition member colliding with the stopper member or the like during operation is prevented. The object of the present invention is to realize such a demand.

  In order to solve the above-mentioned problem, the invention of claim 1 according to the present invention provides a liquid seal vibration isolator provided with a liquid chamber therein and an elastic partition member facing the liquid chamber to absorb internal pressure. The elastic partition member is provided with a deformation restricting portion that protrudes in the input direction of the main vibration to be vibrated, the tip side is a thinned protrusion, and the stopper for receiving the deformation restricting portion at a predetermined deformation time The stopper is provided with a restriction recess for receiving the protrusion, and the protrusion is elastically deformed in response to an increase in internal pressure in the restriction recess.

  According to a second aspect of the present invention, in the first aspect of the invention, the protrusion of the deformation restricting portion has a substantially V-shaped cross section in which the cross section is tapered toward the tip, and the restricting concave portion is narrowed toward the bottom. In an initial state, a predetermined clearance is formed between the protrusion and the restriction recess.

  According to a third aspect of the present invention, in the first aspect, the deformation restricting portion is formed so as to protrude in an opposite direction from both surfaces of the elastic partition member facing the main vibration input direction, and the deformation restricting portion protrudes in the opposite direction. Are asymmetric with respect to each other.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the deformation restricting portion has a groove portion communicating with the inner and outer peripheral sides at an appropriate circumferential position.

  According to a fifth aspect of the present invention, in the first aspect of the present invention, a liquid escape recess is provided on the inner wall of the restriction recess.

  According to a sixth aspect of the present invention, in the liquid seal vibration isolator provided with a liquid chamber therein and an elastic partition member facing the liquid chamber so as to absorb the internal pressure, at least one surface of the elastic partition member is a convex curved surface. The center thick part which comprises this, the deformation | transformation control part which protrudes in the input direction of the main vibration provided in the outer peripheral side, and the thin main deformation part provided in the outer side are characterized by the above-mentioned.

  A seventh aspect of the invention is characterized in that, in the sixth aspect, a rigid ring is integrated with the deformation restricting portion, and a thin main deformation portion is integrally provided outside the deformation restricting portion.

  An eighth aspect of the invention is characterized in that, in the seventh aspect, the rigid ring is made of metal or resin.

  According to a ninth aspect of the present invention, there is provided a liquid seal vibration isolator in which a liquid chamber is provided therein and an elastic partition member facing the liquid chamber is provided to absorb internal pressure. A deformable portion is provided, and a rigid ring is integrated on the inner peripheral side across the main deformable portion.

  A tenth aspect of the invention is characterized in that, in any of the sixth, seventh, and ninth aspects, an attachment portion is integrally formed on an outer peripheral side of the main deformation portion.

  An eleventh aspect of the invention is characterized in that, in the tenth aspect, a metal outer ring is integrated with the mounting portion.

  According to a twelfth aspect of the present invention, in the eleventh aspect, there is provided a deflection forming means for giving a deflection to the main deformation portion when the diameter of the metal outer ring is reduced.

  According to a thirteenth aspect of the present invention, in the above twelfth aspect, the elastic partition member is substantially circular when viewed from a main vibration input direction, and the section of the mounting portion in the direction along the central axis of the elastic partition member is asymmetric. It is characterized by that.

  A fourteenth aspect of the present invention is characterized in that, in the tenth aspect, when the elastic partition member is attached, the attachment portion is compressed radially inward to give the main deformation portion a deflection.

  A fifteenth aspect of the present invention is characterized in that, in any one of the first to fourteenth aspects, one side of the elastic partition member is exposed to an air chamber, and the air chamber is switched to open to the atmosphere, reduced pressure, or increased pressure. And

According to a sixteenth aspect of the present invention, in any one of the first to fourteenth aspects, the one surface of the elastic partition member faces the air chamber, and the air chamber is subjected to a change in the internal pressure of the liquid chamber. The internal pressure is continuously controlled by reducing or increasing the pressure according to the change.

  The invention of a seventeenth aspect allows the one surface of the elastic partition member to face the air chamber in any one of the first to fourteenth aspects, and reduces or pressurizes the air chamber according to a change in the internal pressure of the liquid chamber. The elastic partition member is vibrated in synchronization with an input vibration waveform.

According to an eighteenth aspect of the present invention, in any one of the first to fourteenth aspects, the one side of the elastic partition member faces the air chamber, and the resonance frequency is controlled by continuously changing the air pressure in the air chamber. Features.

  According to the first aspect of the present invention, the elastic partition member is provided with the deformation restricting portion that protrudes in the input direction of the main vibration to be vibrated, the tip side is formed into a thinned protrusion, and the deformation restricting portion is a predetermined portion. Since the stopper for receiving this at the time of deformation is provided, and the stopper is provided with a restriction recess for accommodating the protrusion, the volume of the protrusion pushed into the restriction recess according to the increase in the internal pressure of the liquid chamber increases. Since the deformation restricting portion becomes gradually harder, the spring constant of the elastic partition member can be increased nonlinearly, and a remarkable nonlinear spring characteristic can be given to the elastic partition member. Thereby, a low dynamic spring can be realized in the minute amplitude region, and a high damping can be realized in the large amplitude region. In addition, by accommodating the protrusions in the restriction recesses, it is possible to prevent the generation of hitting sound and reduce noise.

  According to the invention of claim 2, the protrusion of the deformation restricting portion has a substantially V-shaped cross section in which the cross section is tapered toward the tip and the restricting concave portion is narrowed toward the bottom. Can be changed. In addition, since a predetermined clearance is formed between the protrusion and the restriction recess in the initial state, a slight change in internal pressure does not cause a spring, and a low dynamic spring can be realized.

  According to the invention of claim 3, the deformation restricting portion is formed to protrude in the opposite direction from both surfaces facing the main vibration input direction of the elastic partition member, and the deformation restricting portions protruding in the opposite direction are asymmetric with each other. The internal pressure can be tuned by changing the degree of asymmetry.

  According to the fourth aspect of the present invention, since the groove portion that communicates the inner and outer peripheral sides is provided at an appropriate position in the circumferential direction of the deformation restricting portion, the liquid is moved in and out with the deformation restricting portion sandwiched even during elastic deformation to close the liquid. Can be prevented.

  According to the fifth aspect of the present invention, since the recess for liquid escape is provided on the inner wall of the restricting recess, even when the protrusion of the deformation restricting portion is pushed into the restricting recess, the liquid into the restricting recess is discharged to the outside. The liquid can be moved, and the confinement of the liquid can be prevented.

According to the invention of claim 6, the elastic partition member includes a central thick portion having at least one convex curved surface, a deformation restricting portion that is provided on the outer peripheral side and protrudes in the main vibration input direction, and an outer side thereof. Since the thin main deformation portion provided in is provided, a low dynamic spring can be realized by elastic deformation of the main deformation portion having a small spring constant in a minute amplitude region in which a booming sound vibration or the like is input. In a large amplitude region where high damping characteristics are required, high damping can be realized by increasing the non-linear spring constant of the deformation restricting portion.
In addition, the central thick wall portion is elastically deformed, so that the change in the internal pressure can be alleviated and the generation of a hitting sound at the time of a large input can be prevented. In addition, since it has a convex curved surface, local elastic deformation in which the central portion swells greatly with internal pressure is less likely to occur, and durability toughness can be improved.

  According to claim 7, since the deformation restricting portion protruding in the input direction of the main vibration is integrally provided on the outer peripheral side of the central thick portion, and the rigid inner ring is integrated with this deformation restricting portion, the deformation restricting portion is The rigidity of the inner ring increases stability against compression applied to the distal end side, so that the function as a stopper for restricting deformation of the elastic partition member is enhanced. Further, the central thick part, the deformation restricting part, and the rigid ring can move integrally.

  According to claim 8, since the rigid inner ring is made of metal or resin, the rigid inner ring has a simple shape and a high degree of freedom such as thickness and size. By appropriately changing the performance, the tuning of the performance in the spring constant or the like of the deformation restricting portion becomes easy.

  According to the ninth aspect, since the thin main deformation portion is provided on the outer peripheral portion of the elastic partition member, and the rigid inner ring is integrated on the inner peripheral side of the main deformation portion, a small amplitude region in which a booming sound vibration or the like is input. The low dynamic spring can be realized by elastic deformation of the main deformation portion having a small spring constant. In a large amplitude region where damping characteristics are required, high damping can be realized because the spring constant of the inner peripheral side portion of the main deformation portion is increased by the rigid inner ring.

  According to the tenth aspect, since the attachment portion is integrally formed outside the main deformation portion, the outermost peripheral portion in the vicinity of the attachment portion is the main deformation portion, and the main deformation portion is effectively operated to reduce the internal pressure. Absorb. Further, the load on the main deformation portion can be dispersed to improve the durability.

  According to the eleventh aspect, since the metal outer ring is integrated with the attachment portion, the dimensional accuracy of the attachment portion can be increased, and stable attachment is possible. Moreover, the adhesiveness in the elastic body part of an attaching part can be made favorable, and a sealing performance can be improved.

According to the twelfth aspect, it is possible to cause the main deformation portion to bend by integrating a metal outer ring with the mounting portion and reducing the diameter of the metal ring. The low dynamic spring at the initial stage of minute input can be realized by the deflection. At this time, since the diameter of the metal outer ring is reduced, the attachment portion can be stably reduced in diameter.
In addition, a rigid inner ring is provided inside the main deformation part, and this rigid inner ring is not affected by the diameter reduction. The main deformation portion can be compressed between the inner ring and the inner ring so that the deflection can be reliably and forcibly formed.

  According to the thirteenth aspect, since the cross section of the attachment portion in the axial direction of the elastic partition member has an asymmetric structure, the elastic partition member can be formed so as to bend with a relatively simple structure.

  According to the fourteenth aspect, when attaching the elastic partition member, the attachment portion is compressed radially inward at the same time, so that the main deformation portion can be deflected by the attachment of the elastic partition member.

  According to the fifteenth aspect, since one side of the elastic partition member faces the air chamber, and the air chamber is switched to open to the atmosphere, reduced pressure or pressurized, the elastic partition member can be elastically deformed when open to the atmosphere. Thus, when the pressure is reduced or increased, liquid column resonance in the resonance orifice or the like can be effectively generated by preventing elastic deformation of the elastic partition member.

  According to the sixteenth aspect, it is possible to continuously control so as to suppress the internal pressure fluctuation by reducing or pressurizing the air chamber according to the internal pressure fluctuation of the liquid chamber. Moreover, the internal pressure can be absorbed with respect to input vibrations in a wide frequency range by changing the switching point (frequency) continuously over a wide range without making it fixed.

  According to the seventeenth aspect, the elastic partition member is synchronized with the input vibration waveform by causing one side of the elastic partition member to face the air chamber and reducing or pressurizing the air chamber according to the change in the internal pressure of the liquid chamber. Since the vibration is applied, the input vibration can be absorbed by the vibration to suppress the internal pressure fluctuation actively, and the vibration can be continuously controlled in response to the change of the input vibration.

According to the eighteenth aspect, the one side of the elastic partition member faces the air chamber, and the atmospheric pressure in the air chamber is continuously changed, so that the resonance frequency of the resonance orifice or the like is continuously changed. be able to.

  Embodiments will be described below with reference to the drawings. FIG. 1 is a side view of an engine mount, and FIG. 2 is a plan view thereof. As shown in these drawings, a first mounting bracket 1 attached to the engine side, a cylindrical second mounting bracket 2 attached to the vehicle body side, and an insulator 3 for connecting them are provided. The insulator 3 has a substantially dome shape made of an appropriate elastic material such as rubber.

  FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 2, and Z indicates the input direction of the main vibration to be shaken. The interior of this liquid seal vibration isolator is divided into a main liquid chamber 5 and a sub liquid chamber 6 by a partition member 4, and the main liquid chamber 5 is constituted by a portion of the wall portion of the insulator 3, and the sub liquid chamber 6 is a diaphragm. 7 is closed. The main liquid chamber 5 and the sub liquid chamber 6 are always connected by a damping orifice 8 and are connected by an idle orifice 9 only when idling.

  The idle orifice 9 communicates with the main liquid chamber 5 at the entrance 9a, and is opened and closed by the central portion 7a of the diaphragm 7 that moves in the vertical direction in the figure by the elastic member 10. The expansion / contraction member 10 has an air chamber therein, and is connected to an external negative pressure device or the atmosphere through a communication passage 10a. When the atmosphere is released, the expansion / contraction member 10 extends upward by a spring, pushes up the central portion of the diaphragm 7 and closes the exit portion of the idle orifice 9. When connected to the negative pressure device, the telescopic member 10 contracts to release the pressure on the central portion of the diaphragm 7 and opens by opening the outlet 9b portion of the idle orifice 9.

  FIG. 4 is an enlarged cross-sectional view of the elastic partition member 12. A mounting recess 11 that opens toward the main liquid chamber 5 is formed inside the upper portion 4 a of the partition member 4, and an elastic partition member 12 is provided therein to partition the air chamber 13. The elastic partition member 12 is substantially circular in plan view (Z direction in FIG. 3), and the central axis is parallel to the Z direction.

  The air chamber 13 is connected to a negative pressure device such as an intake negative pressure (not shown) or a pressurizing device such as an air pump or the atmosphere via an air passage 14 formed through the side wall of the second mounting bracket 2 to reduce the pressure or the air chamber 13. Pressurize or release to atmosphere. In the case where only the connection between the expansion member 10 and the air chamber 13 is switched to the negative pressure device or the atmosphere, the same switching means can be used.

  The periphery of the elastic partition member 12 is fixed to the peripheral wall portion 11 a of the mounting recess 11 in the upper portion 4 a by a restraining member 15, and the main liquid chamber 5 side of the elastic partition member 12 is connected to the main liquid chamber by a communication hole 16 provided in the restraining member 15. 5 communicates. The holding member 15 and the bottom 11b of the mounting recess 11 are stoppers that restrict deformation beyond a predetermined level when the elastic partition member 12 is elastically deformed in the vertical direction.

  When the air chamber 13 is open to the atmosphere, the elastic partition member 12 freely elastically deforms according to the internal pressure fluctuation of the main liquid chamber 5 to absorb the internal pressure and reduce the dynamic spring. When the inside of the air chamber 13 is depressurized, the central thick portion 20 of the elastic partition member 12 is mainly sucked and fixed to the bottom portion 11b side so that free elastic deformation does not occur. When the air chamber 13 is pressurized, the overall tension is increased and the spring constant is increased. Therefore, in either case, the internal pressure of the main liquid chamber 5 is increased, and mainly the resonance efficiency of the idle orifice 9 is increased.

  FIG. 4 is an enlarged sectional view of the elastic partition member 12. The elastic partition member 12 is made of an appropriate elastic member such as rubber, and has a central thick portion 20 having a substantially convex lens-shaped cross section at the center, and a thickest wall protruding in the vertical direction with a substantially chevron cross section around the central thick portion 20. It is a substantially circular member as a whole that integrally includes a deformation restricting portion 21, a thinnest main deforming portion 22 provided on the outer periphery thereof, and a mounting portion 23 provided on the outer periphery thereof.

  A rigid ring 24 is integrated with the base 21 a of the deformation restricting portion 21 so as to surround the central thick portion 20. A central portion of the base portion 21a forms a step portion 21b, and a rigid inner ring 24 is embedded up to the inside of the step portion 21b. The inner ring 24 is formed of a rigid member made of metal or resin. However, resin is preferable from the viewpoint of weight reduction. A metal outer ring 25 is also integrated with the outer peripheral side portion of the mounting portion 23.

  The cross section of the deformation restricting portion 21 changes so as to gradually taper in the vertical direction of the figure, and the inner and outer peripheral surfaces form a tapered surface. A projecting protrusion 26 is formed integrally with the tip end side of the base portion 21a so as to taper and form a substantially chevron cross section. A first taper portion 26 that gradually tapers is formed. The protrusion 26 is fitted into a restriction recess 27 having a substantially V-shaped cross section provided at a position corresponding to the deformation restriction portion 21 of the holding member 15. The inner wall of the restricting recess 27 is a tapered wall 28 having a tapered shape.

  A part of the tapered wall 28 is provided with a relief part 29 which is a slit-like groove, and communicates with the bottom part of the restriction concave part 27 and the space around the elastic partition member 12 so as to allow the liquid in the restriction concave part 27 to escape. ing. A similar restriction recess 30 and taper wall 31 are also provided on the bottom 11 b side of the mounting recess 11. However, the relief part 29 may or may not be provided. When providing, the air in the regulation recessed part 30 can be escaped.

  The tapered walls 28 and 31 are formed in a substantially symmetric cross-sectional shape, and the tapered surface is different from the projection 26 and has a more inclined angle. In the initial state, the tip of the projection 26 is tapered. The wall 28 and the tapered wall 31 are fitted relatively shallowly. When the protrusion 26 is pushed into the restricting recess 27 by the movement of the elastic partition member 12 due to the increase in internal pressure, the volume of the protruded protrusion 26 increases, and the deformation restricting portion 21 gradually hardens, resulting in a large reaction. A force is applied to the deformation restricting portion 21 side.

  As a result, when the displacement amount of the elastic partition member 12 increases, the protrusion 26 is strongly pressed toward the holding member 15 or the bottom 11b side so that the deformation restricting portion 21 moves greatly in the vertical direction in the figure. The reaction force on the bottom 11b side increases, and the spring constant of the elastic partition member 12 increases nonlinearly.

  The main deformation portion 22 is a low dynamic spring forming portion that absorbs the hydraulic pressure by elastically deforming the entire elastic partition member 12 by a relatively small vibration input. In addition, since the attachment portion 23 is integrally formed outside the main deformation portion 22, the outermost peripheral portion in the vicinity of the attachment portion 23 is the main deformation portion 22, so that the main deformation portion 22 is effectively operated to absorb the internal pressure. can do. Further, the load on the main deformation portion 22 can be dispersed to improve the durability.

  The main deforming portion 22 is deflected by a structure described later of the mounting portion 23 so that no spring is generated on the elastic partition member 12 side until there is no deflection with respect to a minute portion of the input vibration. Deflection refers to the deflection already given in the state before vibration input.

  The mounting portion 23 is sandwiched between the holding member 15 and the wall surface of the mounting recess 11 forming the air chamber 13. The upper and lower surfaces of the attachment portion 23 are brought into close contact with the holding member 15 and the wall surface of the attachment recess 11, and the close contact surfaces are integrally formed with the attachment portion 23 in advance and sealed by a seal protrusion 23 a that is crushed by the contact surface. Further, the inner diameter of the mounting recess 11 is smaller than the outer diameter of the mounting portion 23, and the mounting portion 23 is reduced in diameter to be accommodated.

  When the diameter of the mounting portion 23 is reduced at this time, the outer ring 25 is included, so that the diameter is reduced, and the inner ring 24 is included inside the deformation restricting portion 21, so that the partition member 4 and the central thick portion 20 is not reduced in diameter. Therefore, the interval between the attachment portion 23 and the deformation restricting portion 21 is narrowed, and the main deformation portion 22 can be deflected.

  FIG. 5 is an enlarged cross-sectional view of the holding member 15 on the distal end side of the deformation restricting portion 21 and the receiving portion side. Since the bottom 11b side has the same structure, description on this side will be omitted (the same applies hereinafter). The deformation restricting portion 21 includes a base portion 21a having a thick and tapered surface, and a protrusion 26 having a thinner thickness and a tapered surface having a tight inclination.

  The inclination angle formed by the taper surface of the protrusion 26 and the surface of the taper wall 28 and the horizontal plane (the surface orthogonal to the main vibration input direction Z to be vibrated) is the taper wall 28 with respect to the inclination angle α of the protrusion 26. The inclination angle β of is larger, and the inclination is tighter.

  FIG. 6 is a plan view of the elastic partition member 12, and FIG. 7 is a front view thereof (a direction indicated by an arrow A in FIG. 6). As shown in FIG. 6, the elastic partition member 12 has a circular shape as a whole, and the central thick portion 20, the deformation restriction portion 21, the main deformation portion 22, and the attachment portion 23 are concentrically outward in this order in the radial direction. Is formed.

  Moreover, the groove part 21c which crosses the deformation | transformation control part 21 to radial direction is formed in the circumferential direction appropriate place (this example 180 degree interval in the circumferential direction). This groove portion 21 c communicates with the inner and outer peripheral sides of the deformation restricting portion 21 and has a deep, substantially V-shape as clearly shown in FIG. 7. For this reason, the groove portion 21c crosses the deformation restricting portion 21 so that the liquid can move in the inner and outer peripheral spaces, and even if the elastic partition member 12 vibrates at a relatively high frequency, the outer peripheral side of the deformation restricting portion 21 and the restraining member. The liquid is prevented from being confined in the space 19 (see FIG. 4) between the two.

  FIG. 8 is a modified example of the attachment portion 23, and shows the structure of the deflection forming means for reliably giving the deflection to the main deformation portion 22. A in the figure is a first modification, and a portion of the connecting portion between the attachment portion 23 and the main deformation portion 22 that is bent (in this case, the lower side in the drawing) is cut out so that the lightening portion 34 is removed. The thickness of the mounting portion 23 is formed asymmetrically in the main vibration input direction (that is, the vertical direction in the figure).

  When the outer ring 25 is reduced in diameter from the outer peripheral side as shown by the arrow, the main deforming portion 22 is deformed to the side of the thinned portion 34 having a small resistance as shown in FIG. Deflection can be formed reliably and forcibly. The symbol d in the figure indicates the amount of deflection. Without such a deflection forming means, when the outer ring 25 is reduced in diameter, it is unclear whether the outer ring 25 will bend in the upper or lower direction in the figure, but this deflection direction can be clarified and free in the intended direction. Can be formed.

  C in the figure is a second modification, and the thickness of the outer ring 25 is formed asymmetrically in the vertical direction. Moreover, the thin part side is made into the taper surface 35, and it changes gradually to a thin part toward the upper or lower side. In this way, by reducing the diameter of the outer ring 25, the main deforming portion 22 is forced to bend toward the tapered surface 35 having a low resistance, and a deflection is generated.

  D in the figure is a third modification, which is a combination of the first and second modifications. If it does in this way, a deflection can be forcedly formed more certainly.

  Next, the operation of this embodiment will be described. When the internal pressure of the main liquid chamber 5 rises with the air chamber 13 open to the atmosphere, when the rise is small, a spring due to elastic deformation does not occur until the deflection of the main deformation portion 22 is eliminated, and the low dynamic spring It becomes.

  When the internal pressure rises to such an extent that the deflection of the main deformation portion 22 is eliminated, the main deformation portion 22 performs elastic deformation to absorb the increase in internal pressure, and also maintains a low dynamic spring. At this time, since the central thick part 20 and the deformation restricting part 21 are thick, they are hardly elastically deformed, and they move up and down integrally, so that these parts do not generate a spring, and the main deforming part 22 The spring becomes dominant. Further, the protrusion 26 of the deformation restricting portion 21 does not elastically deform.

  When the internal pressure further increases, the protrusion 26 of the deformation restricting portion 21 is pushed into the restricting recesses 27 and 30 and starts elastic deformation. As shown in FIG. 5, when the protrusion 26 enters the deformation restricting portion 27 with the clearances 32 and 33 formed in the initial state as shown in FIG. 5A, the protrusion 26 is shown in FIG. 5B. Is deeply pushed into the restriction recess 27 and is compressed by the taper wall 28, so that a spring is generated by this elastic deformation, and the overall spring constant of the elastic partition member 12 is increased.

  When the internal pressure continues to rise, the protrusion 26 is completely pushed into the restricting recess 27, and the elastic deformation is maximized and the spring is also maximized. For this reason, the whole spring constant in the elastic partition member 12 is also maximized. Therefore, the spring constant of the elastic partition member 12 is nonlinearly changed with respect to the increase in internal pressure.

  The solid line in FIG. 9 represents the spring constant in the present embodiment, which is significantly non-linear compared to the broken line indicating the spring constant in a conventional elastic partition member having a general simple shape. The conventional elastic partition member does not include the substantially convex lens-shaped cross section of the central thick portion 20, the deformation restricting portion 21, the inner ring 24, and the like. The vertical axis represents the internal pressure, and the horizontal axis represents the amount of displacement of the elastic partition member.

  As described above, a low dynamic spring can be realized in a minute amplitude region where a booming sound vibration or the like due to a vibration of about 100 to 400 Hz centered on about 200 Hz is input. Further, high attenuation can be realized in a large amplitude region where damping characteristics are required. Furthermore, it is possible to eliminate the hitting sound for a sudden large input when the engine is started or stopped.

  In addition, since the central thick portion 20 has a cross-section that is curved in a substantially convex lens shape, it is possible to prevent local deformation that causes the center to swell greatly due to internal pressure, and to improve durability toughness. Furthermore, since the attachment portion 23 is integrally formed outside the main deformation portion 22, the outermost peripheral portion in the vicinity of the attachment portion 23 is the main deformation portion 22, and the load on the main deformation portion 22 is dispersed to improve durability. Can be improved.

  In addition, since the inside of the air chamber 13 is switched to open to the atmosphere, reduced pressure, or increased pressure, the elastic partition member 12 can be freely elastically deformed when the atmospheric pressure is set, and a low dynamic spring can be obtained. When the air chamber 13 is depressurized, the central thick portion 20 is sucked and fixed to the bottom portion 11b side, so that the internal pressure is not absorbed by the elastic partition member 12.

  Further, even when pressurized, the tension of the elastic partition member 12 is increased to prevent elastic deformation. Therefore, the internal pressure of the main liquid chamber 5 is increased to increase the resonance efficiency with respect to the damping orifice 8 and the idle orifice 9, and high damping can be realized in a vibration region where high damping is required. As for the idle orifice 9, the switching valve can be shared by interlocking the opening thereof with the negative pressure of the air chamber 13.

  In addition, the switching point (frequency) is not fixed and the switching point is continuously changed in a wide frequency range according to the frequency of the input vibration, so that the internal pressure can be absorbed with respect to the wide range of input vibration. .

  Further, since the deformation restricting portion 21 is provided, the elastic deformation is restricted in the state shown in FIG. In addition, since the rigid inner ring 24 is integrated into the base 21a of the deformation restricting portion 21, the deformation restricting portion 21 is hardened by the rigid inner ring 24 against the compression applied to the protrusion 26 at the tip. For this reason, the function as a stopper which controls a deformation | transformation of the elastic partition member 12 increases. Further, the central thick portion 20, the deformation restricting portion 21 and the inner ring 24 move together to absorb the internal pressure.

At this time, in the initial state shown in FIG. 5A, since it enters the restriction recess 27 with a small clearance 32, the protrusion 26 comes into contact with the restriction recess 27 with a relatively small internal pressure. Therefore, noise can be prevented.
Further, since the relief portion 29 is formed in the tapered wall 28, the liquid cannot be confined to the bottom side of the restricting recess 27, so that the spring constant can be stabilized.

  In addition, since the groove portion 21c that communicates the inner and outer peripheral sides is provided at an appropriate position in the circumferential direction of the deformation restricting portion 21, the liquid can be moved in and out across the deformation restricting portion 21 even during elastic deformation. It is possible to prevent the liquid from being confined in the space 19 between the outer peripheral side portion of the deformation restricting portion 21 and the holding member 15.

  Further, since the central thick portion 20 is thick with a substantially convex lens-shaped cross section, it is difficult to be elastically deformed, and this portion is prevented from being greatly elastically deformed locally by internal pressure. However, when an impact load is input, the central thick-walled portion 20 is elastically deformed as a whole without being locally deformed and absorbs it, thereby mitigating fluctuations in internal pressure.

  Further, since the rigid intermediate ring 24 is present, the spring of the central thick portion 20 is further enlarged to prevent local elastic deformation. Moreover, the intermediate ring 24 prevents the deformation restricting portion 21 from falling down due to elastic deformation of the central thick portion 20 and the like, and makes the elastic deformation of the protrusion 26 accurately correspond to the change in internal pressure.

  In addition, since the intermediate ring 24 is made of metal or resin, the ring itself has a simple shape and has a high degree of freedom such as thickness and size. Therefore, by appropriately changing the intermediate ring 24, the deformation restricting portion 21 is changed. It becomes easy to tune performance in terms of the spring constant.

  In addition, since the metal outer ring 25 is integrated with the attachment portion 23, the dimensional accuracy of the attachment portion 23 can be increased, and stable attachment is possible. In addition, as shown in FIG. 4, when the surface of the attachment portion 23 is in close contact with other parts, the attachment portion 23 is an elastic member, and the close contact portion is sealed with a seal protrusion 23 a integrated therewith. The sealing performance can be improved by improving the properties.

  Further, the metal outer ring 25 is integrated with the mounting portion 23 and the outer ring 25 is reduced in diameter, whereby the main deformation portion 22 can be bent. The low dynamic spring at the initial stage of minute input can be realized by the deflection. At this time, since the diameter of the metal outer ring 25 is reduced, the diameter of the mounting portion 23 can be stably reduced.

  In addition, a rigid intermediate ring 24 is provided inside the main deformation portion 22, and the intermediate ring 24 is not affected by the diameter reduction with respect to the outer ring 25, and therefore, the outer ring 25 of the mounting portion 23 and its ring It is possible to reliably and forcibly form the deflection by compressing the main deformation portion 22 with the intermediate ring 24 positioned inward.

  In addition, as shown in FIG. 8, if the cross section of the mounting portion 23 in the axial direction of the elastic partition member 12 is an asymmetric structure as the deflection forming means, the deflection can be formed with a relatively simple structure. it can.

  The present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the principle of the invention. For example, the inside of the air chamber 13 is opened to the atmosphere, or decompression or pressurization is applied to vibrate the elastic partition member 12 so as to synchronize with the vibration input to the main liquid chamber 5, and the vibration is input vibration frequency and amplitude It may be configured to change in response to changes in

In this way, the internal pressure can be continuously controlled according to the vibration input to the main liquid chamber 5, and a kind of active liquid seal vibration isolator can be configured to control the internal pressure against a wide range of internal pressure fluctuations. Such continuous control such as pressure reduction or pressurization for the air chamber 13 is known and can be controlled based on a detection value of an appropriate internal pressure sensor.
Can be controlled continuously corresponding to

  Further, if the atmospheric pressure of the air chamber 13 is changed in the resonance region of the resonance orifice (8, 9), the resonance frequency control for freely changing the resonance frequency of the resonance orifice (8, 9) can be realized. In addition, the resonance orifice is not limited to a damping orifice or an idle orifice, but can have various characteristics such as a starting orifice intended for vibration during starting.

  In addition, the resonance that can be controlled is not limited to the liquid column resonance in the resonance orifice, and various resonances can be targeted. For example, as shown by the phantom line in FIG. 3, if the thin portion 3 a is provided in a part of the insulator 3, the membrane resonance generated by the thin portion 3 a due to the liquid flow in the main liquid chamber 5 can be controlled. This membrane resonance occurs mainly in the booming sound region. Similarly, when the umbrella-like member 1a facing the main liquid chamber 5 is attached to the first attachment member, the liquid flow around the umbrella member 1a causes resonance mainly in the booming sound region, and this resonance is similarly controlled. it can.

  Further, in FIG. 4, if the pair of deformation restricting portions 21 projecting in the vertical direction, which is the main vibration input direction, are formed in an asymmetric structure in which the characteristics such as the projection amount and the thickness are different from each other in the vertical direction, The internal pressure can be freely tuned by changing the degree of asymmetry.

  Moreover, the metal outer ring 25 is not necessarily required to form the deflection in the main deformation portion 22. That is, by configuring the elastic partition member 12 in which the mounting portion 23 not provided with the outer ring 25 is formed to be pushed into the mounting recess 11 having an inner diameter smaller than the outer diameter, the mounting portion 23 is formed. By compressing inward in the radial direction, the deflection of the main deformation portion 22 can be formed. Also in this case, the presence of the intermediate ring 24 located inside is effective.

  Moreover, if the attachment portion 23 is compressed from above by the restraining member 15, the deformation of the main deformation portion can be further ensured. In the case where the diameter of the mounting portion 23 is reduced, even if the outer ring 25 made of metal is integrated, the diameter can be reduced by pressing strongly. Furthermore, the elastic partition member 12 is not necessarily pushed into the mounting recess 11 and attached, but may be pushed into a through hole or the like.

Further, it may be attached to the wall portion or the like of the main liquid chamber 5 while reducing the outer diameter of the attachment portion 23 with a ring-shaped frame member or the like. Furthermore, restraint or release control and tension control for the elastic partition member 12 may be directly controlled by mechanical means using a solenoid, a motor, or the like without necessarily changing the atmospheric pressure in the air chamber 13.

Side view of the engine mount according to the embodiment Plan view of an engine mount according to the embodiment Sectional view along line 3-3 in FIG. Expanded sectional view of the elastic partition member Enlarged sectional view of the protrusion The figure which shows the modification regarding deflection formation Top view of elastic partition member Front view of elastic partition member Graph showing dynamic spring characteristics

Explanation of symbols

1: First mounting bracket, 2: Second mounting bracket, 3: Insulator, 4: Partition member, 5: Main liquid chamber, 6: Sub liquid chamber, 7: Diaphragm, 8: Damping orifice, 9: Idle orifice, 10 : Stretchable member, 12: Elastic partition material, 13: Air chamber, 21: Deformation restricting part, 22: Thin part, 23: Mounting part, 24: Inner ring, 25: Outer ring, 26: Projection, 26a: Slit, 27: Deformation restriction recess, 28: Taper wall, 29: Relief part, 30: Deformation restriction recess, 31: Taper wall

Claims (18)

In a liquid seal vibration isolator provided with a liquid chamber inside and provided with an elastic partition member facing the liquid chamber so as to absorb internal pressure, the elastic partition member is deformed to protrude in the input direction of the main vibration to be vibrated Providing a restricting portion, and making the tip side gradually thinner, a stopper for receiving the deformation restricting portion at a predetermined deformation, providing a restricting recess for accommodating the protruding portion in this stopper, A liquid seal vibration isolator characterized in that the protrusion is elastically deformed in response to an increase in internal pressure in the regulating recess. The projecting portion of the deformation restricting portion has a substantially V-shaped cross section in which the cross section tapers toward the tip, and the restricting concave portion narrows toward the bottom, and in an initial state, between the projecting portion and the restricting concave portion. 2. The liquid seal vibration isolator according to claim 1, wherein a predetermined clearance is formed. The deformation restricting portion is formed to protrude in the opposite direction from both surfaces of the elastic partition member facing the main vibration input direction, and the deformation restricting portions protruding in the opposite direction are asymmetric to each other. 1 liquid seal vibration isolator. 2. The liquid seal vibration isolator according to claim 1, wherein the deformation restricting portion has a groove portion communicating with the inner and outer peripheral sides at an appropriate place in the circumferential direction. 2. The liquid seal vibration isolator according to claim 1, wherein a recess for liquid escape is provided on an inner wall of the restriction recess. In the liquid seal vibration isolator provided with a liquid chamber inside and provided with an elastic partition member facing the liquid chamber so as to absorb internal pressure, the elastic partition member has a central thick portion at least one of which forms a convex curved surface. A liquid seal vibration isolator comprising a deformation restricting portion provided on the outer peripheral side and projecting in a main vibration input direction, and a thin main deforming portion provided on the outer side thereof. 7. The liquid seal vibration isolator according to claim 6, wherein a rigid inner ring is integrated with the deformation restricting portion, and the main deforming portion is provided integrally with an outer periphery of the deformation restricting portion. The liquid seal vibration isolator according to claim 7, wherein the rigid inner ring is made of metal or resin. In a liquid seal vibration isolator provided with a liquid chamber inside and provided with an elastic partition member facing the liquid chamber to absorb internal pressure, a thin main deformation portion is provided on the outer peripheral portion of the elastic partition member. A liquid seal vibration isolator comprising a rigid inner ring integrated on an inner peripheral side with a deformable portion interposed therebetween, and an attachment portion provided on an outer peripheral side. 10. The liquid seal vibration isolator according to claim 6, wherein an attachment portion is integrally formed on an outer peripheral side of the main deformation portion. The liquid seal vibration isolator according to claim 10, wherein a metal outer ring is integrated with the mounting portion. The liquid seal vibration isolator according to claim 11, wherein the metal outer ring of the attachment portion is reduced in diameter to bend the main deformation portion. 13. The liquid seal vibration proof according to claim 12, wherein the elastic partition member is substantially circular as viewed from a main vibration input direction, and a cross section of the mounting portion is asymmetric in a direction along a central axis of the elastic partition member. apparatus. 11. The liquid seal vibration isolator according to claim 10, wherein when the elastic partition member is attached, the attachment portion is compressed radially inward to give deflection to the main deformation portion. The liquid seal vibration isolator according to claim 1, wherein one side of the elastic partition member faces an air chamber, and the air chamber is opened to the atmosphere, or is switched to a reduced pressure or a pressurized state. The internal pressure is continuously controlled by causing one side of the elastic partition member to face the air chamber and reducing or pressurizing the air chamber according to a change in the internal pressure of the liquid chamber. Item 15. The liquid seal vibration isolator described in any one of Items 1-14. The elastic partition member is caused to vibrate in synchronization with the input vibration waveform by causing one side of the elastic partition member to face the air chamber and reducing or pressurizing the air chamber according to the change in the internal pressure of the liquid chamber. The liquid seal vibration isolator according to any one of claims 1 to 14, wherein The liquid seal prevention according to any one of claims 1 to 14, wherein one surface of the elastic partition member is allowed to face an air chamber, and the resonance frequency is controlled by continuously changing the air pressure in the air chamber. Shaker.

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