JP2006266273A - Liquid sealed vibration absorbing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid sealed vibration absorbing device for preventing abnormal noises from being transmitted from a mounting bracket or a partition member into a cabin while suppressing the occurrence of bubbles in an opening on the side of a main liquid chamber of an orifice passage. <P>SOLUTION: The partition member 31 in a disc shape is constructed integrally with an elastic body part 32, a partition plate part 51 and a second elastic body part 41 laid on one another in descending order. The elastic body part 32 has an outer orifice passage 33 provided on the lower face side along almost all periphery of the outer periphery and an opening portion 34 opening at one end through the upper face. The elastic body part 32 is fixed to the partition plate part 51 with a locking protrusion 38 on the lower face fixed to a locking hole 55 of the partition plate part 51. Thus, the elastic body part 32 can be slightly floated from the partition plate part 51 with the input of vibration, to absorb liquid pressure while suppressing the occurrence of bubbles on the side of the main liquid chamber K1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator used for vehicle engine mounts and body mounts.

  Conventionally, as this type of liquid-filled vibration isolator, for example, as shown in Patent Document 1, one end side is fixed to the engine side, and one end side is fixed to the first attachment member and opens to the other end side. A rubber elastic body having a recess, a cylindrical second mounting member fixed to the outer periphery of the other end of the rubber elastic body and attached to the vehicle body side, and a peripheral portion held on the inner periphery of the second mounting bracket. A diaphragm that forms a liquid chamber in which liquid is sealed between the concave portion, a peripheral portion is held on the inner periphery of the second mounting member, and the liquid chamber is divided into a main liquid chamber and a sub liquid chamber; There has been known one provided with a ring-shaped orifice forming metal fitting for forming an orifice passage communicating with the auxiliary liquid chamber and a partition member made of a rubber movable film disposed in the central opening thereof. When a vibration input is applied in the axial direction, the liquid-filled vibration isolator receives vibration input mainly due to the liquid column resonance effect caused by the liquid flowing between the main liquid chamber and the sub liquid chamber through the orifice passage of the partition member. Attenuate.

In this liquid-filled vibration isolator, when a large vibration input is applied, bubbles are likely to be generated near the opening due to a rapid flow of liquid, particularly at the opening on the main liquid chamber side of the orifice passage. However, there is a problem that the shock wave propagates in the main liquid chamber and propagates the liquid, and is transmitted to the vehicle interior as an abnormal noise from the mounting member, the partition member, and the like, and as a result, the vibration noise of the vehicle is deteriorated. In the liquid-filled vibration isolator of Patent Document 1, a rubber coating layer is provided on a surface that partitions and forms the main liquid chamber and the orifice passage of the orifice forming metal fitting, and the main liquid chamber and the orifice passage of the orifice forming metal fitting are formed by this rubber coating layer. The exposed surface is reduced. Absorption of the above-mentioned shock wave with this rubber coating layer suppresses the generation of abnormal noise. However, in the case of this liquid-filled vibration isolator, the range in which the rubber coating layer is provided is limited, and it is not always possible to sufficiently suppress the generation of bubbles, and therefore the generation of abnormal noise cannot be sufficiently prevented. It was.
JP 2004-3634 A

Further, in Patent Document 2, in a liquid-filled vibration isolator having a structure similar to that of Patent Document 1, a non-linear cutting portion is provided in a part of a diaphragm disposed between a main liquid chamber and a sub liquid chamber. And a tongue piece surrounded by a cutting portion is provided. As a result, when a low-frequency vibration having a large amplitude is input to the liquid-filled vibration isolator, the diaphragm is greatly bent toward the space with the lower pressure. As a result, a slit-like overflow passage is first formed between the tip of the tongue piece and the diaphragm wall opposite thereto, so that the liquid can escape from the high-pressure side space through this. The pressure fluctuation is suppressed, and the generation of abnormal noise is suppressed. However, in the case of this vibration isolator, a non-linear cut portion is provided in a part of the diaphragm, and there is a problem that the reliability of the diaphragm is lacking.
Japanese Patent Publication No. 2-55660

  The present invention is intended to solve such a problem. When a large vibration input is applied, the generation of bubbles at the opening on the main liquid chamber side of the orifice passage is suppressed, and bubbles are generated in the main liquid chamber. An object of the present invention is to provide a liquid-filled vibration isolator capable of preventing abnormal noise transmitted from a mounting bracket, a partition member, or the like to a vehicle interior due to a shock wave propagating through the liquid.

  In order to achieve the above object, the structural features of the present invention include a mounting bracket, a cylindrical body bracket disposed on one end side to face the mounting bracket, and a space between the mounting bracket and the body bracket. A rubber elastic body that is elastically connected to close the opening on one end of the main body, and is fixed to the other end of the main body, closes the opening on the other end, and is surrounded by the main body and the rubber elastic body. A diaphragm member that forms a space filled with liquid inside and a space that is fixed to the inner peripheral surface side of the main body bracket to form a main liquid chamber between the rubber elastic body and the diaphragm member In the liquid-filled vibration isolator having an equilibrium liquid chamber formed therein and a partition member that circulates the liquid between the main liquid chamber and the equilibrium liquid chamber by an orifice passage provided at least on the outer peripheral side, the partition member is a thick plate Shaped elastic body part and non-adhesive with the elastic body part And a hard partition plate part fixed by a locking means in part, and an orifice passage is formed in the elastic part, and the elastic part is arranged so as to face the main liquid chamber side. It is in.

  In the invention configured as described above, when a large vibration input is applied to the liquid-filled vibration isolator and a large pressure fluctuation occurs between the equilibrium chamber and the main liquid chamber, a large liquid pressure is applied to the orifice passage. A sudden flow of liquid occurs in the opening on the main liquid chamber side, but is fixed by the locking means in a state where the elastic body portion having the orifice passage constituting the partition member and the partition plate portion are overlapped in a non-adhesive manner. Therefore, the elastic body portion can slightly float from the partition plate portion due to the hydraulic pressure. Therefore, a large liquid pressure applied to the orifice passage is absorbed, and the flow of the liquid is relaxed in the vicinity of the opening on the main liquid chamber side, so that bubbles are hardly generated in the vicinity of the opening of the orifice passage. As a result, the generation of shock waves due to bubble bursting in the main liquid chamber is suppressed, and accordingly, transmission of abnormal noise from the mounting brackets, partition members, and the like to the vehicle interior is prevented. In addition, the partition member has a simple structure including an elastic body portion and a partition plate portion, and is provided at a low cost.

  Moreover, in this invention, it is preferable that the partition plate part is made into the container shape which has the cylinder wall extended to the main liquid chamber side in the outer periphery, and the elastic body part is fitted in the container. Accordingly, since the elastic body portion is covered with the cylindrical wall, even when the partition member is fixed in the main body metal fitting by the restriction of the main body metal fitting, the elastic body portion is still in the cylindrical wall even if it receives a radial squeezing pressure. Therefore, the orifice passage provided in the partition member is properly maintained. Therefore, a smooth flow of the liquid in the orifice passage is ensured, and an action in which the elastic body portion slightly floats from the partition plate portion due to the fluid pressure with respect to a large vibration input is also ensured.

  In the present invention, the orifice passage provided in the elastic body portion includes an outer orifice passage provided along the outer peripheral side, and an inner orifice passage branched from the outer orifice passage and extending toward the center side of the elastic body portion. As a partition member, the partition plate portion is formed in a container shape having a cylindrical wall extending toward the equilibrium liquid chamber at the outer peripheral edge, and penetrates through the inner orifice passage at the center of the partition plate portion. A thick plate having a hole, a second outer orifice passage which is fitted in the container and connected to the outer orifice passage on the outer peripheral side and opens to the equilibrium liquid chamber, and has a sub liquid chamber communicating with the through hole A second elastic body portion can be provided.

  Thus, the outer orifice passage and the second outer orifice passage communicate with the first liquid chamber and the equilibrium liquid chamber, the outer orifice passage and the inner orifice passage branched therefrom pass through the main liquid chamber and the partition plate portion. A double orifice with the second orifice communicating with the sub liquid chamber provided in the second elastic body portion through the hole is formed. As a result, the first orifice suppresses vibrations at a low frequency, and the second orifice suppresses vibrations at a higher frequency than the first orifice. Furthermore, since the second elastic body portion is covered with the cylindrical wall, even when the partition member is fixed in the main body bracket by the restriction of the main body metal fitting, the second elastic body portion is Since it is protected by the cylindrical wall, it hardly deforms and the elastic body part hardly deforms accordingly. Therefore, the inner and outer orifice passages and the second outer orifice passage provided in the partition member are also properly maintained. Therefore, a smooth flow of the liquid in each orifice passage is ensured, and an operation in which the elastic body portion slightly floats from the partition plate member due to the liquid pressure with respect to a large vibration input is also ensured. Moreover, the partition member having two kinds of orifices that can correspond to different vibration frequencies can be simply configured by the elastic body portion, the partition plate portion, and the second elastic body portion, and the partition member is provided at low cost. .

  Moreover, in this invention, it is preferable that the partition plate part is made into the container shape which has the cylinder wall further extended to the main liquid chamber side in the outer periphery, and the elastic body part is fitted in the container. Thereby, since the elastic body portion is covered with the cylindrical wall, even if the partition member receives a squeezing pressure in the radial direction when being fixed in the main body metal fitting by the restriction of the main body metal fitting, the elastic body portion is Since it is reliably protected, it is not deformed and the orifice passage provided in the partition member is also properly maintained. Therefore, a smooth flow of the liquid in the orifice passage is ensured, and an action in which the elastic body portion slightly floats from the partition plate member due to the liquid pressure with respect to a large vibration input is also ensured.

  Moreover, in this invention, it is preferable that the latching means was comprised by the latching protrusion which protruded from the bottom face of the elastic body part, and the latching hole which latches the latching protrusion provided in the partition plate part. By locking the locking protrusion protruding from the bottom surface of the elastic body portion into the small hole provided in the partition plate portion, the elastic body portion can be easily locked to the partition plate portion, and the structure of the locking means is simple. Yes, provided at low cost.

  According to the present invention, when a large vibration input is applied to the liquid-filled vibration isolator and a large pressure fluctuation occurs in the equilibrium chamber and the main liquid chamber, the elastic body portion and the partition plate portion constituting the partition member are not bonded. Since the elastic body portion is slightly lifted from the partition plate member by the hydraulic pressure, the large hydraulic pressure applied to the orifice passage is absorbed and the main fluid chamber is In the vicinity of the opening on the side, bubbles are hardly generated in the liquid. As a result, in the present invention, generation of shock waves due to bubble bursting is suppressed, and transmission of abnormal noise from the mounting bracket, partition member, or the like to the vehicle interior is prevented, thereby suppressing vibration noise of the vehicle.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a front cross-sectional view of a liquid-filled vibration isolator for supporting an engine of an automobile according to a first embodiment. FIG. 2 is a plan view of a partition member, a cross-sectional view taken along line II2-II2, a bottom view, and II4-II4. It is shown by the line sectional view.

  The liquid-filled vibration isolator 10 includes a round bar-shaped mounting bracket 11, a cylindrical body bracket 15 that is coaxially spaced apart from the lower end of the mounting bracket 11, and both the brackets 11 and 15. A rubber elastic body 21 that is elastically connected and closes the upper end side opening of the main body metal 15, a diaphragm member 27 that is fixed to the lower end side of the main body metal 15 and closes the lower end side opening, A partition member 31 is provided that is fixed to the peripheral surface side and partitions the space between the rubber elastic body 21 and the diaphragm member 27. A space between the partition member 31 and the rubber elastic body 21 is a main liquid chamber K1 filled with a liquid, and a space between the partition member 31 and the diaphragm member 27 is a balanced liquid chamber K2 filled with a liquid. The liquid flows between the main liquid chamber K1 and the equilibrium liquid chamber K2 through the outer orifice passage 33 and the second outer orifice passage 42 provided in the cylinder 31. Further, the circular recess 46 of the second elastic body portion 41 is made into the sub liquid chamber K3 filled with the liquid, and the liquid flows between the main liquid chamber K1 and the sub liquid chamber K3 through the outer and inner orifice passages 33 and 35. It is like that. Hereinafter, the liquid-filled vibration isolator 10 will be described in more detail. In the following description, the vertical relationship of each part of the liquid-filled vibration isolator 10 is aligned with that in FIG.

  The mounting bracket 11 integrally includes a round bar-shaped shaft portion 12 and a protruding portion 13 that is an annular thick plate that protrudes radially outward at a position near the lower end of the shaft portion 12. As for the axial part 12, the side wall 12a inclines in the reverse cone shape in the other side of the protrusion part 13. As shown in FIG. Further, the boundary between the side wall of the shaft portion 12 and the protrusion 13 and the boundary between the side wall portion 12a and the bottom wall of the shaft portion 12 are connected in a curved shape. An attachment hole 14 extending from the upper end surface to a position near the lower end is provided at the axial center position of the shaft portion 12, and a screw groove is formed in the attachment hole 14. A protruding rubber portion 26 is bonded and formed on the protrusion 13 with a predetermined thickness from the intermediate position in the radial direction of the upper surface to the outer surface.

  The metal shell 15 includes a substantially cylindrical tube portion 16, a conical portion 17 that is widened in an inverted conical shape upward at the upper end of the tube portion 16, and a radially outward portion at the periphery of the upper end opening of the conical portion 17. A ring-shaped flange portion 18 slightly extending in an axial direction and a ring-shaped inner bent portion 19 which is bent in the axial direction at the bottom end of the tube portion 16 and slightly protrudes are integrally provided. The main body metal fitting 15 is formed by subjecting a plate material to press molding (drawing), and the inner bending portion 19 is formed by punching the inner bottom wall portion on the lower end side during the press molding drawing process. Are formed at the same time. The inner diameter of the inner bent portion 19 is substantially the same as the outer diameter of the partition member 31 and the diaphragm member 27 before the drawing of the cylindrical portion 16. In addition, about the inner side bending part 19, after the partition member 31 and the diaphragm member 27 are inserted in the cylindrical cylinder part 16, when performing a drawing process to the cylinder part 16 in order to prevent those detachment, It may be formed.

  The rubber elastic body 21 is bonded along the entire circumference of the inner peripheral surface of the conical portion 17 of the main body bracket 15, closes the opening on the upper end side of the conical portion 17, and extends outward in the axial direction from the upper end of the main body bracket 15. Bulges into a substantially conical shape and is bonded to the surface of the lower portion of the mounting bracket 11 from the protruding portion 13 and is connected to the protruding rubber portion 26. The mounting bracket 11 is in a state in which the lower part from the protrusion 13 is coaxially embedded in the rubber elastic body 21. The rubber elastic body 21 has an annular bottom 22 that extends slightly inward in the direction perpendicular to the axis at the substantially lower end position of the conical portion 17 inside the metal shell 15, and further inside the bottom 22. At the end, a recessed portion 23 is provided that is recessed in a substantially chevron shape upward about the axis. By providing the recess 23, the rubber elastic body 21 is configured so that the thickness of each part is substantially equal. Further, a thin covering portion 25 made of a rubber elastic body is provided on the entire inner peripheral surface of the cylindrical portion 16, and is connected to the bottom portion 22 of the rubber elastic body main body 21. The inner diameter between the inner peripheral surfaces of the covering portion 25 is substantially the same as the inner diameter of the inner bent portion 19 at the lower end of the cylindrical portion 16 before drawing. The rubber elastic body 21 and the covering portion 25 are integrally formed by vulcanization molding using a normal rubber material such as NR and EPDM together with the protruding rubber portion 26.

  A partition member 31 and a diaphragm member 27 are coaxially inserted into the space in the cylindrical portion 16 in order from the upper side in the axial direction. The diaphragm member 27 has a thin annular ring portion 28 with a short axial length and is bonded to the lower side of the inner peripheral surface of the ring portion 28 so as to be curved in a gentle spherical shape upward in the ring portion 28. The movable film 29 is made of a thin rubber elastic body. The outer diameter of the ring portion 28 is substantially the same as the inner diameter of the inner bent portion 19 and the covering portion 25 of the cylindrical portion 16 before drawing.

  As shown in FIGS. 2-1 to 3, the partition member 31 has a disk shape, and the elastic body portion 32, the partition plate portion 51, and the second elastic body portion 41 are superposed and integrated in order from the upper side. It is configured. The elastic body part 32 is a circular thick plate made of a rubber elastic body, and is provided with an outer orifice passage 33 which is an arc-shaped groove recessed along substantially the entire outer circumference on the lower surface side. An opening 34 is provided at one end of 33 so as to penetrate through the upper surface. Further, an inner orifice passage 35 branched from the outer orifice passage 33 toward the center side of the elastic body portion 32 is provided at a position where the central angle is approximately 180 ° from one end of the outer orifice passage 33. The inner orifice passage 35 extends substantially concentrically with respect to the outer orifice passage 33, extends approximately 270 ° from the branch position at a central angle, and is connected to the central semicircular recess 35a. The depths of the outer and inner orifice passages 33 and 35 are about 2/3 of the thickness of the elastic body portion 32.

  An outer peripheral side of the outer orifice passage 33 is an annular outer partition wall 36 having the same width and perpendicular to the plate surface, and a spiral inner partition wall 37 whose diameter is reduced toward the center between the orifice passages 33 and 35. It has become. The inner partition wall 37 has the same width as the outer partition wall 36, but is thicker at the portion where the outer orifice passage 33 branches into the inner orifice passage 35. The outer partition wall 36 and the inner partition wall 37 communicate with each other through gaps at both ends of the arc shape of the outer orifice passage 33. In addition, locking projections 38 that integrally protrude vertically from the lower plane of the partition wall are provided at three locations on the outer circumferential side of the semicircular recess 35a of the inner partition wall 37 at a central angle of approximately 70 °. The locking projection 38 has a thin rod shape with a tip bulging in a spherical shape.

  The second elastic body portion 41 is also a circular thick plate made of a rubber elastic body having substantially the same outer diameter and thickness as the elastic body portion 32, and is opposed to the outer orifice passage 33 of the elastic body portion 32 on the upper surface side. 2 is provided with a second outer orifice passage 42, which is an arc-shaped groove that is recessed along substantially the entire circumference along the outer peripheral side, and is open through the lower surface facing the other end of the outer orifice passage 33 A portion 43 is provided. The outer peripheral side of the second outer orifice passage 42 is an annular outer partition wall 44 having the same width and perpendicular to the plate surface, and the inner peripheral side of the second outer orifice passage 42 is an annular inner partition wall 45. . The inner partition 45 has a circular recess 46 having the same depth as the second outer orifice passage 42. The outer partition 44 and the inner partition 45 are connected between the arc-shaped ends of the second outer orifice passage 42.

  As shown in FIG. 2-4, the partition plate portion 51 is formed by subjecting a metal thin plate to press working. The partition plate portion 51 is bent at the outer peripheral side of the disk portion 52 and has an annular side wall extending vertically. A container shape having a portion 53. The disc part 52 is provided with a central hole 54 in the center, and is provided with a locking hole 55 at a position corresponding to the locking projection 38 surrounding the central hole 54, and further has a second elasticity. A flow hole 56 is provided at a position corresponding to the opening 43 of the body 41. The inner diameter and height of the side wall portion 53 are substantially the same as the outer diameter and thickness of the second elastic body portion 41.

  Regarding the assembly of the partition member 31, first, the second elastic body portion 41 is inserted into the partition plate portion 51 by press fitting so that the flow hole 56 is aligned with the opening 43 of the partition plate portion 51, and then the elastic body portion. 32 is assembled by inserting and locking the locking projections 38 protruding from the inner partition wall 37 into the locking holes 55 on the upper surface of the disk portion 52 of the partition plate portion 51 and superimposing them on the upper surface. When the locking projections 38 are assembled to the locking holes 55, the locking projections 38 are pulled so that the locking holes 55 are compressed.

  Regarding the formation of the liquid-filled vibration isolator 10, first, the mounting bracket 11 and the body bracket 15 are mounted on a predetermined molding die (not shown), and a rubber elastic material is injected to perform vulcanization molding. Thus, the rubber elastic body 21, the covering portion 25 and the protruding rubber portion 26 are integrally formed, and a rubber vulcanized molded product is obtained. With this rubber vulcanized molded product immersed in a liquid, the partition member 31 is inserted into the cylindrical portion 16 of the main body 15 through the opening of the inner bent portion 19 with the elastic body portion 32 facing upward. 25 is in close contact with the inner peripheral surface and is in contact with the bottom 22 of the rubber elastic body 21. Next, the diaphragm member 27 is inserted into the cylindrical portion 16 of the main body metal 15 from the lower side of the partition member 31 and is brought into contact with the partition member 31.

  Thereafter, the cylindrical portion 16 is drawn to reduce the diameter of the cylindrical portion 16 and apply a compressive force to the partition member 31 and the diaphragm member 27 via the covering portion 25. In the partition member 31, since the side wall portion 53 of the partition plate portion 51 receives this compressive force via the covering portion 25, it hardly deforms in the radial direction. Therefore, the second elastic body portion 41 and the elastic body portion 32 having substantially the same outer diameter as the side wall portion 53 are also hardly deformed and the original shape is maintained. The outer and inner orifice passages 33 and 35 and the second outer orifice passage 42 provided in the elastic body portion 41 are also properly maintained. As a result, smooth flow of the liquid in each of the orifice passages 33, 35, and 42 is ensured, and an operation that the elastic body portion 32 slightly floats from the partition plate portion 51 by the liquid pressure with respect to a large vibration input is also ensured. The Further, the diaphragm member 27 is also hardly deformed in the radial direction because the ring portion 28 receives the compressive force, and the movable film 29 does not become a problem.

  Further, by drawing the tube portion 16, the entire tube portion 16 is reduced in diameter, and the inner bent portion 19 at the lower end is reduced in diameter so that the inner diameter becomes smaller than the outer diameter of the ring portion 28 of the diaphragm member 27. As a result, the partition member 31 and the diaphragm member 27 are held in the cylindrical portion 16 in a state in which the partition member 31 and the diaphragm member 27 are prevented from being detached by the inner bending portion 19, thereby forming a liquid-filled vibration isolator. Thus, the space between the partition member 31 and the rubber elastic body 21 is made the main liquid chamber K1 filled with liquid, and the space between the partition member 31 and the diaphragm member 27 is made the equilibrium liquid chamber K2 filled with liquid. The liquid flows through the outer orifice passage 33 between the main liquid chamber K1 and the equilibrium liquid chamber K2. Further, the inside of the circular recess 46 of the second elastic body portion 41 through the outer and inner orifice passages 33 and 35 in the partition member 31 is made into a sub liquid chamber K3 filled with liquid, and the outer and inner orifice passages 33 and 35 are filled. The liquid is allowed to flow between the main liquid chamber K1 and the sub liquid chamber K3. In addition, as the liquid sealed in each liquid chamber K1, K2, K3, an incompressible liquid is sealed, and for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like can be employed. A low-viscosity liquid having a viscosity of 0.1 Pa · s or less is preferably employed in order to effectively obtain a vibration-proofing effect based on the liquid column resonance effect of the liquid.

  The liquid-filled vibration isolator 10 is attached to the engine side by fixing the mounting bracket 11 to an engine side bracket (not shown) with the axial direction facing up and down, and a mounting bracket (not shown) attached to the body bracket 15. ) Is fixed to the vehicle body side.

  In the embodiment configured as described above, when the vibration input from the engine is applied to the liquid-filled vibration isolator 10 and a pressure fluctuation occurs between the main liquid chamber K1 and the equilibrium liquid chamber K2, the rubber elastic body 21 In addition to the expansion and contraction of the liquid, the low-frequency vibration can be appropriately damped by the liquid column resonance effect caused by the liquid flowing through the outer orifice passage 33 provided in the partition member 31 between the main liquid chamber K1 and the equilibrium liquid chamber K2. it can. In addition, the liquid column resonance action caused by the liquid flowing through the outer and inner orifice passages 33 and 35 provided in the partition member 31 between the main liquid chamber K1 and the sub liquid chamber K3 allows proper vibration at a frequency higher than the above low frequency. Can be attenuated.

  With the force generated during normal traveling of the vehicle, the locking protrusion 38 is compressed and locked to the partition plate portion 51, and therefore the elastic body portion 32 is unlikely to rise from the partition plate portion 51. On the other hand, when a large vibration input is applied to the liquid-filled vibration isolator 10 and a large pressure fluctuation occurs between the main liquid chamber K1 and the equilibrium liquid chamber K2, a large liquid pressure is applied to the outer and inner orifice passages 33 and 35. An abrupt liquid flow occurs in the vicinity of the opening 34 on the main liquid chamber K1 side. However, in a state in which the elastic body portion 32 and the partition plate portion 51 constituting the partition member 31 are overlapped in a non-adhering manner, the locking protrusion 38 of the elastic body portion 32 is fixed by the locking hole 55 of the partition plate portion 51. Therefore, the elastic body portion 32 can be slightly lifted from the partition plate portion 51 by the hydraulic pressure. Therefore, a large liquid pressure applied to the orifice passages 33 and 35 is absorbed, and the flow of the liquid is reduced in the vicinity of the opening on the main liquid chamber K1 side, so that bubbles are formed in the liquid in the vicinity of the opening 34 of the outer orifice passage 33. Is unlikely to occur. As a result, in the present embodiment, the generation of shock waves due to the bubble burst in the main liquid chamber K1 is suppressed, and accordingly, an abnormal noise from the mounting bracket 11, the main body bracket 15, the partition member 31, etc. Is prevented, so that the vibration noise of the vehicle is suppressed.

Next, Modification 1 of the above embodiment will be described.
As shown in FIGS. 3A and 3B, in the first modification, in the partition member 31 of the above embodiment, the elastic body portion 32 is also fitted to the partition member 51 </ b> A having the same shape as the partition plate portion 51. . The partition plate portions 51A and 51 are fixed by bonding the disk portions 52 to each other, and the second elastic body portion 41 is fitted into the lower partition plate portion 51 by press-fitting in the same manner as in the above embodiment. The elastic body portion 32 is fitted into the partition plate member 51A by press-fitting, and the locking protrusions 38 of the elastic body portion 32 are press-fitted into the locking holes 55 provided in both the partition plate members 51 and 51A to be locked. The elastic body portion 32 is fixed to the partition plate portion 51.

  Thereby, in the modification 1, since the elastic body part 32 is covered with the side wall part 53, the diaphragm | throttle direction at the time of a partition member being fixed in the cylinder part 16 by the cylinder part 16 diaphragm | throttle of the main body metal fitting 15 is shown. Even if it receives a pressure, it hardly deforms, and each orifice passage provided in the elastic body portion 32 and the second elastic body portion 41 is more appropriately maintained. Therefore, a smooth flow of the liquid in the orifice passage is ensured, and an operation in which the elastic body portion 32 slightly floats from the partition plate portion 51A due to the fluid pressure with respect to a large vibration input is also ensured. As a result, in the modified example 1, as in the embodiment, it is possible to suppress the generation of bubbles particularly in the vicinity of the opening 34 on the main liquid chamber K1 side of the partition plate portion 51A with respect to a large vibration input. Propagation of abnormal noise into the room can be prevented.

Next, a second modification of the above embodiment will be described.
As shown in FIGS. 4-1 to 3, in Modification 2, the partition member 61 attenuates single-frequency vibration having a single orifice passage in which one elastic body portion 62 is fitted to the partition plate portion 57. Is for. Similar to the elastic body portion 32, the elastic body portion 62 is a groove that extends along substantially the entire circumference on the outer peripheral side on the lower surface side and is spirally recessed on the other end side to the center side and reaches the center hole 63a. A single orifice passage 63 is provided, and an opening 64 is provided at one end of the orifice passage 63 so as to penetrate the upper surface.

  The outer peripheral side of the orifice passage 63 is an annular outer partition wall 65 having the same width and perpendicular to the plate surface. The outer partition wall 65 is followed by a spiral inner partition wall 66. On both sides of the center hole 63a of the inner partition wall 66, there are provided locking projections 67 that integrally project vertically from the partition lower plane. The partition plate portion 57 has the same shape as the partition plate portion 51, and a central hole 58 a corresponding to the central hole 63 a is provided in the center of the flat plate portion 58, and a side wall portion 59 is provided. The elastic body portion 62 is fitted into the partition plate portion 57 by press-fitting, and the locking protrusion 67 of the elastic body portion 62 is press-fitted into the locking hole 58b provided in the partition plate portion 57, whereby the elastic body portion 62 is inserted into the partition plate. It is fixed to the part 57.

  Thereby, also in the modification 2, since the elastic body part 62 is covered by the side wall part 59, the radial throttle pressure when the partition plate part 57 is fixed in the cylindrical part 16 by the throttle of the main body metal 15 Even if it receives, the orifice channel | path 63 provided in the elastic-body part 62 does not deform | transform substantially, but the orifice channel | path 63 is maintained appropriately. Therefore, a smooth flow of the liquid in the orifice passage 63 is ensured, and an operation in which the elastic body portion 62 slightly floats from the partition plate portion 57 due to the fluid pressure with respect to a large vibration input is also ensured. As a result, in the second modification, as in the embodiment, the generation of bubbles in the vicinity of the opening 64 on the main liquid chamber K1 side of the elastic body 62 can be suppressed with respect to a large vibration input. Propagation of abnormal noise to can be prevented. In the second modification, the shape of the orifice passage 63 is not limited to the spiral shape, but may be an outer orifice passage shape only on the outer peripheral side as shown in the above-described embodiment in accordance with the vibration frequency.

  In the above-described embodiment, the upper end of the main body metal fitting 15 is spaced downward from the lower end of the mounting metal fitting 11 and faces the lower end. Instead, the upper end of the main body metal fitting 15 surrounds the lower end side of the mounting metal fitting 11. It may be opposed in a state. Further, in the above-described embodiments and modifications, the elastic body portion 32 is fixed to the partition plate portion 51 with the locking protrusions 38 provided on the elastic body portion 32 in the locking holes 55 provided in the partition plate portion 51. However, instead of this, the elastic body portion may be provided with a locking hole and the partition plate portion may be provided with a locking projection, or a similar locking means may be employed. The elastic body part and the partition plate part may be partially fixed with an adhesive. In addition, the liquid-filled vibration isolator shown in the above embodiment is an example, and can be implemented in various forms without departing from the gist of the present invention.

  In the present invention, when a large vibration input is applied to the liquid-filled vibration isolator and a large pressure fluctuation occurs in the equilibrium chamber and the main liquid chamber, the elastic body portion and the partition plate portion constituting the partition member are overlapped without bonding. In this state, the elastic member can be slightly lifted from the partition plate member by the hydraulic pressure, and the large hydraulic pressure applied to the orifice passage is absorbed, so that the main fluid chamber side Air bubbles are less likely to be generated in the vicinity of the opening. As a result, in the present invention, generation of shock waves due to bubble bursting is suppressed, and transmission of abnormal noise from the mounting bracket, partition member, etc. to the vehicle interior is prevented, thereby suppressing vibration noise of the vehicle. Is useful.

It is front sectional drawing which shows the liquid enclosure type vibration isolator which is an Example of this invention. It is a top view which shows the partition member which comprises a part of the liquid enclosure type vibration isolator. It is sectional drawing of the II2-II2 line direction which shows the partition member. It is a bottom view which shows the partition member. It is sectional drawing of the II4-II4 line direction which shows the partition member. It is a top view which shows the partition member which is the modification 1. It is sectional drawing of the III-III line direction which shows the partition member. It is a top view which shows the partition member which is the modification 2. It is sectional drawing of the IV-IV line direction which shows the partition member. It is a top view which shows the partition member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Liquid enclosure type vibration isolator, 11 ... Mounting bracket, 15 ... Main body metal fitting, 16 ... Cylindrical part, 17 ... Conical part, 19 ... Inside bending part, 21 ... Rubber elastic body main body, 23 ... Recessed part, 25 ... Covering , 27 ... Diaphragm member, 31 ... Partition member, 32 ... Elastic body portion, 33 ... Outer orifice passage, 34 ... Opening portion, 35 ... Inner orifice passage, 38 ... Locking projection, 41 ... Second elastic body portion, 42 ... second outer orifice passage, 43 ... opening, 51 ... partition plate part, 52 ... disc part, 53 ... side wall part, 54 ... center hole, 55 ... locking hole, 56 ... flow hole, 57 ... partition plate part 58 ... Flat plate part, 58a ... Central hole, 58b ... Locking hole, 59 ... Side wall part, 61 ... Partition member, 62 ... Elastic body part, 63 ... Orifice passage, 64 ... Opening part, 67 ... Locking protrusion.

Claims (5)

Mounting brackets,
A cylindrical main body fitting disposed opposite to the mounting bracket on one end side;
A rubber elastic body main body that elastically connects between the mounting bracket and the main body bracket and closes one end side opening of the main body bracket;
A diaphragm member that is fixed to the other end of the main body fitting, closes the other end side opening, and forms a space filled with liquid in the interior surrounded by the main body fitting and the rubber elastic body;
It is fixed to the inner peripheral surface side of the metal shell, partitions the space, forms a main liquid chamber with the rubber elastic body, and forms an equilibrium liquid chamber with the diaphragm member. In a liquid-filled vibration isolator provided with a partition member that circulates liquid between the main liquid chamber and the equilibrium liquid chamber by an orifice passage provided in
The partition member is provided with a thick plate-like elastic body portion and a hard partition plate portion that is overlapped with the elastic body portion in a non-adhesive manner and fixed in part by a locking means. The liquid-filled type vibration damping device is characterized in that the orifice passage is formed on the main body and the elastic body portion is disposed so as to face the main liquid chamber side. The said partition plate part is made into the container shape which has the cylinder wall extended to the said main liquid chamber side in the outer periphery, The said elastic body part is fitted in this container, The said claim | item characterized by the above-mentioned. Item 2. A liquid-filled vibration isolator according to Item 1. The orifice passage provided in the elastic body portion is composed of an outer orifice passage provided along the outer peripheral side and an inner orifice passage branched from the outer orifice passage and extending toward the center side of the elastic body portion. Has been
As the partition member, the partition plate portion is formed in a container shape having a cylindrical wall extending to the equilibrium liquid chamber side at an outer peripheral edge, and a through hole communicating with the inner orifice passage is provided at the center of the partition plate portion. And has a second outer orifice passage that is fitted in the container and is connected to the outer orifice passage on the outer peripheral side to open to the equilibrium liquid chamber, and has a sub liquid chamber that communicates with the through hole. The liquid-filled vibration isolator according to claim 1, wherein a thick plate-like second elastic body portion is provided. The partition plate portion is further formed in a container shape having a cylindrical wall extending toward the main liquid chamber at the outer peripheral edge, and the elastic body portion is fitted in the container. The liquid-filled vibration isolator according to claim 3. The said locking means is comprised by the latching protrusion which protruded from the bottom face of the said elastic-body part, and the latching hole which latches this latching protrusion provided in the said partition plate part, The said claim | item characterized by the above-mentioned. Item 5. The liquid-filled vibration isolator according to any one of Items 1 to 4.

Images