JP2019027484A - Fluid encapsulated vibration prevention device and manufacturing method of fluid encapsulated vibration prevention device - Google Patents

Abstract

To provide a fluid encapsulated vibration prevention device in novel structure capable of easily implementing assembly work in an incompressible fluid with a little components, and a novel manufacturing method of the fluid encapsulated vibration prevention device.SOLUTION: In a fluid encapsulated vibration prevention device 10, a first mounting member 12 and a second mounting member 14 are elastically connected by a main body rubber elastic body 16. A pressure receiving chamber 74 of which the wall part partially consists of the main body rubber elastic body 16, and a balance chamber 76 of which the wall part partially consists of a flexible film 46 are formed at both sides of a partition member 34 which is disposed in an interpolation state to the second mounting member 14. An incompressible fluid is encapsulated in the pressure receiving chamber 74 and the balance chamber 76, and the pressure receiving chamber 74 and the balance chamber 76 communicate to each other through an orifice passage 78. An outer peripheral portion of the flexible film 46 is mounted to the second mounting member 14 while being overlapped on an outer peripheral surface of a flexible film protection member 60 which is disposed in such a manner that the flexible film 46 at an opposite side of the partition member 34 is covered.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration isolator applied to, for example, an automobile engine mount and the like, and more particularly, a fluid-filled vibration-proof device using a vibration-proof effect based on a flow action of a fluid sealed inside, and a fluid-filled type The present invention relates to a method for manufacturing a vibration isolator.

  2. Description of the Related Art Conventionally, there has been known a vibration isolating apparatus that is interposed between members constituting a vibration transmission system such as a power unit of an automobile and a vehicle body, and that these members mutually provide vibration isolation connection or vibration isolation support. This vibration isolator is described in, for example, Japanese Patent Laid-Open No. 2014-47897 (Patent Document 1), and includes a first attachment member attached to one member constituting the vibration transmission system and the other constituting the vibration transmission system. The cylindrical member attached to this member has a structure that is elastically connected by a vibration-proof base. In addition, as in Patent Document 1, a fluid-sealed vibration isolator that utilizes the flow action of an incompressible fluid sealed inside is also proposed as a type of vibration isolator. In the fluid-filled vibration isolator, as in Patent Document 1, liquid is sealed in a first liquid chamber and a second liquid chamber formed inside, and the first liquid chamber and the second liquid chamber are orifices. It has the structure mutually connected by.

  By the way, in the fluid filled type vibration isolator, as a method of filling the liquid into the first liquid chamber and the second liquid chamber, the liquid is injected after the first liquid chamber and the second liquid chamber are formed in the atmosphere. In addition, there is a method of forming the first liquid chamber and the second liquid chamber in a water tank filled with the liquid. That is, as shown in FIG. 6 of Patent Document 1, the vulcanized molded body in which the first mounting member and the cylindrical member are elastically connected by the vibration-proof base is submerged in the liquid, and the partition member and the diaphragm are liquidated. The first liquid chamber and the second liquid chamber in which the liquid is sealed are formed by being attached to the vulcanized molded body.

  In this way, when the vulcanized molded body, the partition member, and the diaphragm are assembled in the liquid and the liquid is sealed, the deformation of the diaphragm, which is a rubber film, is limited to enable the assembly work in the liquid. A rigid mounting plate is provided at the outer peripheral end of the diaphragm. However, this mounting plate has become an unnecessary part after the work of assembling the diaphragm in the liquid, for example, if the outer peripheral end of the diaphragm is sandwiched and supported.

JP 2014-47897 A

  The present invention has been made in the background of the above-mentioned circumstances, and its solution is a fluid-filled vibration isolator having a novel structure that can easily perform assembly work in an incompressible fluid. Is realized by providing a smaller number of parts.

  It is another object of the present invention to provide a novel method for manufacturing a fluid-filled vibration isolator that can be easily assembled in an incompressible fluid with a small number of parts.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, in the first aspect of the present invention, the first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and a part of the wall portion is configured by the main rubber elastic body. A pressure receiving chamber and an equilibration chamber having a part of a wall made of a flexible film are formed on both sides of a partition member arranged in an inserted state with respect to the second mounting member. In the fluid-filled vibration isolator in which the incompressible fluid is sealed in the chamber and the equilibrium chamber, and the pressure receiving chamber and the equilibrium chamber are communicated with each other through the orifice passage, the outer peripheral portion of the flexible membrane is The flexible membrane is attached to the second attachment member in a state of being superimposed on the outer peripheral surface of the flexible membrane protection member disposed so as to cover the side opposite to the partition member. To do.

  According to the fluid-filled vibration isolator having the structure according to the first aspect as described above, the outer peripheral portion of the flexible membrane is overlapped with the outer peripheral surface of the flexible membrane protecting member, so that the flexible membrane The deformation amount of the outer peripheral portion is limited by the flexible film protection member. Therefore, it is possible to avoid problems such as difficulty in assembling the flexible film to the second mounting member due to deformation of the outer peripheral portion of the flexible film.

  In addition, since the deformation amount of the outer peripheral portion of the flexible film is limited by the flexible film protection member having a function of protecting the flexible film, the deformation amount is limited to the outer peripheral portion of the flexible film. It is not necessary to fix the special restraining member, and the number of parts can be reduced and the weight can be reduced.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator described in the first aspect, the flexible membrane protection member has a cup shape, and the open end of the flexible membrane protection member The portion is integrally formed with a locking projection that protrudes toward the outer peripheral side, and a hook portion that is hooked on the locking projection is provided on the outer peripheral portion of the flexible film.

  According to the second aspect, the hook portion provided on the flexible membrane is hooked on the locking projection provided on the flexible membrane protection member, so that the outer peripheral portion of the flexible membrane is provided. Is held in a state of covering the flexible membrane protection member, and the outer peripheral portion of the flexible membrane is stably restrained by the flexible membrane protection member.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator described in the second aspect, the outer peripheral portion of the flexible film is on the opening side of the flexible film protection member in the locking projection. And the hook portion provided on the outer peripheral portion of the flexible membrane is overlapped with a first locking portion overlapped with the outer peripheral surface of the locking projection, and And a second locking portion superimposed on a surface opposite to the opening of the flexible membrane protection member.

  According to the third aspect, since the outer peripheral portion of the flexible film including the hook portion is hooked on the locking protrusion in such a manner as to wrap the locking protrusion, the outer peripheral portion of the flexible film is highly reliable. The flexible film is held on the flexible film protection member, and the flexible film is difficult to come off from the flexible film protection member. Therefore, the shape of the outer peripheral portion of the flexible membrane is flexible membrane protection when the flexible membrane placed on the flexible membrane protection member is assembled to the second mounting member in an incompressible fluid. It is stably held by the member.

  According to a fourth aspect of the present invention, in the fluid-filled vibration isolator described in the second or third aspect, a cylindrical portion that extends toward the partition member is integrated with an outer peripheral portion of the flexible film. In addition, a flange-like portion protruding toward the outer periphery is integrally provided at the end of the cylindrical portion, and the hook portion is provided so as to protrude from the outer peripheral end of the flange-like portion. In addition, the hook portion is thinner than the flange-shaped portion.

  According to the 4th aspect, by deform | transforming the hook part made thin, it becomes easy to superimpose so that the hook part may cover the surface of the latching protrusion provided in the flexible film | membrane protective member. In addition, since the flange-like portion is thicker than the hook portion, the deformation rigidity of the outer peripheral portion of the flexible membrane is ensured, and the flexible membrane is difficult to come off from the flexible membrane protection member.

  According to a fifth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to fourth aspects, the flexible film protection member is the second attachment member and the partition member. The cylindrical part provided in the outer peripheral part of the said flexible film | membrane is pinched | interposed between this partition member and this flexible film | membrane protective member.

  According to the fifth aspect, since the space between the overlapping surfaces of the partition member and the flexible membrane protection member is fluid-tightly sealed by sandwiching the cylindrical portion provided in the flexible membrane, it is special. Without providing a seal rubber or the like, the fluid tightness between the partition member and the flexible membrane protection member can be ensured with a small number of parts.

  According to a sixth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to fifth aspects, the flexible film protection member is attached in an inserted state. The inner peripheral surface of the mounting member is covered with a seal rubber layer.

  According to the sixth aspect, the second attachment member and the flexible membrane protection member are overlapped via the seal rubber layer, so that the flexible membrane protection member provides the seal rubber layer to the second attachment member. And is fluid-tightly attached.

  A seventh aspect of the present invention is a method for manufacturing a fluid-filled vibration isolator, wherein the first mounting member and the second mounting member are elastically connected by a main rubber elastic body to form an integrally vulcanized molded product. A preparatory step, and a step in which an outer peripheral portion of a flexible film prepared in advance is separately prepared and overlapped with an outer peripheral surface of a flexible film protection member that covers the flexible film, and is prepared in advance. The partition member and the flexible membrane protection member covered with the flexible membrane are attached to the second mounting member of the integrally vulcanized molded product in a water tank filled with an incompressible fluid. The pressure receiving member in which an incompressible fluid is sealed is assembled by fluid-tightly assembling the partition member and the flexible membrane protection member covered with the flexible membrane to the second mounting member. Forming a chamber and an equilibrium chamber on both sides of the partition member.

  According to the manufacturing method of the fluid filled type vibration damping device according to the seventh aspect, before the flexible membrane is assembled to the second mounting member in the incompressible fluid, the outer periphery of the flexible membrane is The amount of deformation of the outer peripheral portion of the flexible membrane in the incompressible fluid is limited by the flexible membrane protective member by overlaying and covering the portion with the outer peripheral surface of the flexible membrane protective member, Assembly of the flexible membrane to the second mounting member is facilitated.

  According to the present invention, the outer peripheral portion of the flexible membrane constituting the wall portion of the equilibrium chamber is superimposed on the outer peripheral surface of the flexible membrane protection member, and the deformation amount of the outer peripheral portion of the flexible membrane is flexible. Since it is limited by the membrane protection member, it is possible to avoid problems such as difficulty in assembling the flexible membrane to the second mounting member due to deformation of the outer peripheral portion of the flexible membrane. In addition, since the amount of deformation of the outer peripheral portion of the flexible film is limited by the flexible film protection member that protects the flexible film, a special amount for limiting the amount of deformation to the outer peripheral portion of the flexible film. There is no need to fix the restraining member, and the number of parts can be reduced and the weight can be reduced.

Sectional drawing which shows the engine mount as 1st embodiment of this invention. The perspective view of the integral vulcanization molded product which comprises the engine mount shown in FIG. Sectional drawing of the integral vulcanization molded product shown in FIG. The perspective view of the partition member which comprises the engine mount shown in FIG. The front view of the partition member shown in FIG. The bottom view of the partition member shown in FIG. The perspective view of the flexible film | membrane which comprises the engine mount shown in FIG. The front view of the flexible film | membrane shown in FIG. The top view of the flexible film | membrane shown in FIG. XX sectional drawing of FIG. The perspective view of the protection cup which comprises the engine mount shown in FIG. The front view of the protection cup shown in FIG. The top view of the protective cup shown in FIG. XIV-XIV sectional drawing of FIG. Sectional drawing which shows the state which covered the flexible film | membrane on the protective cup. Sectional drawing explaining the assembly in the water tank of an integral vulcanization molded product, a partition member, a flexible membrane, and a protection cup. It is sectional drawing which expands and shows the principal part of the engine mount shown in FIG. 1, Comprising: (a) is before diameter reduction of a 2nd attachment member, (b) is after diameter reduction of a 2nd attachment member, Each is shown.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an engine mount 10 for an automobile as a first embodiment of a fluid filled type vibration damping device having a structure according to the present invention. The engine mount 10 has a structure in which a first mounting member 12 and a second mounting member 14 are elastically connected to each other by a main rubber elastic body 16. In the following description, the vertical direction means, in principle, the vertical direction in FIG. 1 that is the axial direction.

  More specifically, the first mounting member 12 is a high-rigidity member made of metal, synthetic resin, or the like, has a substantially cylindrical shape, and has an annular shape that extends toward the outer periphery at the lower end. The plate portion 18 is integrally formed. Further, the first mounting member 12 is formed with a screw hole 20 extending vertically so as to open on the upper surface.

  The second mounting member 14 is a high-rigidity member similar to the first mounting member 12 and has a thin-walled, large-diameter, generally cylindrical shape. In the present embodiment, a step portion is formed at the middle portion in the vertical direction. 22 is provided, and the upper side of the stepped portion 22 is a large diameter cylindrical portion 24, and the lower side of the stepped portion 22 is a small diameter cylindrical portion 26. Furthermore, an end protrusion 27 that protrudes toward the inner periphery is provided at the lower end of the small diameter cylindrical portion 26, and the end protrusion 27 of the present embodiment is curved with the lower end of the small diameter cylindrical portion 26 facing the inner periphery. As a result, the second mounting member 14 is integrally formed.

  The first mounting member 12 is disposed above the second mounting member 14, and the first mounting member 12 and the second mounting member 14 are elastically connected to each other by the main rubber elastic body 16. ing. The main rubber elastic body 16 has a thick-walled large-diameter substantially truncated cone shape, and an upper end, which is an end portion on the small-diameter side, is vulcanized and bonded to the first mounting member 12, and the large-diameter side. The outer peripheral portion of the lower end portion which is the end portion of the second mounting member 14 is vulcanized and bonded to the stepped portion 22 and the large diameter cylindrical portion 24 of the second mounting member 14. As shown in FIGS. 2 and 3, the main rubber elastic body 16 of the present embodiment is formed as an integrally vulcanized molded product 28 including the first mounting member 12 and the second mounting member 14.

  Further, the main rubber elastic body 16 is formed with a large-diameter recess 30 that opens to the lower surface. The large-diameter recess 30 has a reverse mortar shape that expands downward. Furthermore, a cylindrical seal rubber layer 32 extending downward is integrally formed at the opening peripheral edge of the large-diameter recess 30 in the main rubber elastic body 16, and the seal rubber layer 32 is a small diameter of the second mounting member 14. The inner peripheral surface of the small diameter cylindrical portion 26 is fixed to the inner peripheral surface of the cylindrical portion 26, and is covered with a seal rubber layer 32.

  In addition, a partition member 34 is assembled to the integrally vulcanized molded product 28. The partition member 34 is a hard member formed of metal, synthetic resin, or the like, and has a thick, substantially disk shape as shown in FIGS. Further, the partition member 34 has a stepped outer peripheral surface, the upper part is a large diameter fitting part 36, and the lower part is a small diameter cup fitting part 38. Furthermore, the fitting portion 36 of the partition member 34 is formed with a circumferential groove 40 that opens in the outer peripheral surface and extends in the circumferential direction with a length that is less than one circumference. One end of each end of the circumferential groove 40 is opened to the upper side of the partition member 34 through the upper communication hole 42, and the other is opened to the lower side of the partition member 34 through the lower communication hole 44.

  As shown in FIG. 1, the partition member 34 is disposed in an inserted state with respect to the small-diameter cylindrical portion 26 of the second attachment member 14 of the integrally vulcanized molded product 28. In this embodiment, since the inner peripheral surface of the small diameter cylindrical portion 26 of the second mounting member 14 is covered with the seal rubber layer 32, the second mounting member 14 is the outer peripheral surface of the fitting portion 36 of the partition member 34. The partition member 34 is indirectly attached to the second attachment member 14 in an inserted state by being pressed through the seal rubber layer 32. The outer peripheral surface of the fitting portion 36 of the partition member 34 is pressed against the seal rubber layer 32, so that the inner peripheral surface of the second mounting member 14 and the outer peripheral surface of the fitting portion 36 of the partition member 34 overlap. A space between the mating surfaces is fluid-tightly sealed with a seal rubber layer 32.

  A flexible film 46 is attached to the integrally vulcanized molded product 28. As shown in FIGS. 7 to 10, the flexible film 46 is a thin rubber film having a substantially cup shape that opens upward as a whole, and the bottom wall portion 48 has a substantially corrugated disk shape. Therefore, deformation is easily allowed. That is, the flexible film 46 is composed of a single rubber film, and does not include a metal fitting fixed by vulcanization adhesion or the like.

  Furthermore, the flexible membrane 46 is integrally provided with a substantially cylindrical tubular portion 50, and the tubular portion 50 is provided so as to extend upward from the outer peripheral end portion of the bottom wall portion 48. . As shown in FIG. 10, a substantially annular plate-shaped flange-like portion 52 protruding toward the outer periphery is integrally provided at the upper end portion of the cylindrical portion 50.

  Furthermore, a hook portion 54 is integrally provided at an outer peripheral end portion of the flange-like portion 52 in the flexible film 46. The hook portion 54 protrudes downward from the outer peripheral end portion of the flange-shaped portion 52 and is provided with a first locking portion 56 provided so as to face the outer peripheral side of the tubular portion 50, and the first locking portion 56. A second locking portion 58 provided so as to protrude from the lower end portion toward the inner periphery and to face the lower side of the flange-like portion 52. Accordingly, the hook portion 54 has a substantially L-shaped cross section as a whole and has an annular shape extending over the entire circumference in the circumferential direction.

  Note that the thickness t1 of the first locking portion 56 and the thickness t2 of the second locking portion 58 constituting the hook portion 54 are the thickness Ta of the cylindrical portion 50 and the thickness Tb of the flange-shaped portion 52, respectively. The thickness is preferably smaller than half of the thickness Tb of the flange-like portion 52. In the present embodiment, the thickness Tb of the flange-like portion 52 is made larger than the thickness Ta of the tubular portion 50.

  The flexible membrane 46 is attached to a protective cup 60 as a flexible membrane protection member. The protective cup 60 is a hard member formed of metal, synthetic resin, or the like, and has a cup shape that opens upward as a whole as shown in FIGS. The lower peripheral wall lower portion 64 has a tapered shape that gradually increases in diameter as it goes upward, and the peripheral wall upper portion 66 that is close to the opening has a cylindrical shape that extends vertically with a substantially constant diameter.

  Further, the protective cup 60 has a plurality of ventilation holes 68 formed therethrough. In this embodiment, one ventilation hole 68 is formed at the center of the bottom wall 62 and the six ventilation holes 68 are tapered. It is formed in the shaped peripheral wall lower part 64, and is arrange | positioned at equal intervals in the circumferential direction. However, the formation position and number of the vent holes 68, the hole cross-sectional shape, and the like are not particularly limited, and preferably the air spring is prevented from acting between the flexible membrane 46 and the protective cup 60. Provided to be able to.

  Furthermore, a locking projection 70 protruding to the outer periphery is integrally formed at the opening end portion of the peripheral wall upper portion 66 of the protective cup 60. In the present embodiment, the protective cup 60 is a press fitting, and the upper end of the peripheral wall upper portion 66 of the protective cup 60 is press-bended and bent to the outer periphery, whereby the locking projection 70 is formed over the entire circumference. Yes.

  Here, as shown in FIG. 15, the flexible film 46 is attached to the protective cup 60 in a non-adhesive manner, and the protective cup 60 is disposed so as to cover the lower side of the flexible film 46. . That is, the cylindrical portion 50 provided on the outer peripheral portion of the flexible film 46 is superimposed on the peripheral wall upper portion 66 of the protective cup 60 in an inserted state, and is provided with a flange shape provided on the upper end of the cylindrical portion 50. The portion 52 is superimposed on the upper surface of the peripheral wall upper portion 66 of the protective cup 60. Further, the first locking portion 56 of the hook portion 54 is overlapped with the outer peripheral surface of the locking projection 70, and the second locking portion 58 is overlapped with the lower surface of the locking projection 70. 54 is arranged on the outer peripheral side and the lower side of the locking projection 70 of the protective cup 60. Accordingly, the flange-like portion 52 and the hook portion 54 are arranged so as to surround the periphery of the locking projection 70, and the hook portion 54 is hooked on the locking projection 70, and includes the flange-like portion 52 and the hook portion 54. The outer peripheral portion of the flexible film 46 is applied to the protective cup 60 provided with the locking projection 70 in a state where it is overlapped with the outer peripheral surface of the protective cup 60. The opening side of the protective cup 60 is the upper side, and the side opposite to the opening of the protective cup 60 is the lower side.

  As shown in FIG. 1, the protective cup 60 covered with the flexible film 46 is attached to the second attachment member 14. That is, the peripheral wall upper portion 66 of the protective cup 60 and the cylindrical portion 50 of the flexible membrane 46 are inserted between the small diameter cylindrical portion 26 of the second mounting member 14 and the cup fitting portion 38 of the partition member 34 in the radial direction. It is sandwiched between. Thereby, each outer peripheral part of the protective cup 60 and the flexible film | membrane 46 covered on it is assembled | attached with respect to the 2nd attachment member 14. As shown in FIG. The protective cup 60 has a bottom wall 62 and a peripheral wall lower portion 64 with respect to the bottom wall portion 48 of the flexible membrane 46 in a state where the protective cup 60 and the flexible membrane 46 are assembled to the second mounting member 14. It is arranged on the opposite side to the partition member 34 in the axial direction, and is arranged so as to cover the lower side of the flexible film 46. Further, the space between the flexible membrane 46 and the protective cup 60 is communicated to the outside through the vent hole 68 of the protective cup 60, and deformation of the flexible membrane 46 is allowed without being restricted by the air spring. It has become so.

  Furthermore, in this embodiment, since the inner peripheral surface of the small diameter cylindrical portion 26 of the second mounting member 14 is covered with the sealing rubber layer 32, the protective cup 60 is sealed against the second mounting member 14 with the sealing rubber layer 32. The second mounting member 14 and the protective cup 60 are sealed fluid-tightly by the seal rubber layer 32. In the present embodiment, since the hook portion 54 of the flexible film 46 is interposed between the seal rubber layer 32 and the protective cup 60, sealing by the hook portion 54 can be expected. The seal rubber layer 32 is also present between the end projection 27 of the second mounting member 14 and the hook portion 54 in the axial direction by being deformed by pressing the protective cup 60 and the hook portion 54.

  Furthermore, the opening of the protective cup 60 covered with the flexible film 46 is assembled to the cup fitting part 38 of the partition member 34 in an externally fitted state, and the cylindrical part of the flexible film 46 is provided. 50 and the flange-like portion 52 are disposed between the protective cup 60 and the partition member 34. And the cylindrical cup 50 distribute | arranged between the radial directions of the protective cup 60 and the cup fitting part 38 is pinched | interposed between the protective cup 60 and the cup fitting part 38, and the protective cup 60 and the cup fitting The space between the overlapping surfaces in the radial direction of the portion 38 is fluid-tightly sealed by the cylindrical portion 50. Further, the flange-shaped portion 52 disposed between the upper surface of the protective cup 60 and the fitting portion 36 of the partition member 34 is sandwiched between the protective cup 60 and the fitting portion 36, whereby the protective cup 60. Between the overlapping surfaces in the axial direction of the fitting part 36 is sealed fluid-tightly by the flange-like part 52.

  In the state where the flexible membrane 46 is put on the protective cup 60, a space is formed between the proximal end portion of the flange-like portion 52 of the flexible membrane 46 and the opening edge portion of the peripheral wall upper portion 66 of the protective cup 60. 71 is formed, and when the cylindrical portion 50 and the flange-like portion 52 are compressed and deformed, escape of rubber is allowed by the space 71, and the sealing performance can be stabilized. However, this space 71 may be omitted.

  As described above, in this embodiment, the seal rubber that fluid-tightly seals between the partition member 34 and the protective cup 60 includes the cylindrical portion 50 and the flange-like portion 52 that are integrally provided on the flexible film 46. Therefore, the number of parts can be reduced and the structure can be simplified. However, the fluid tightness between the overlapping surfaces of the protective cup 60 and the partition member 34 is ensured by sandwiching one of the cylindrical portion 50 and the flange-shaped portion 52 between the protective cup 60 and the partition member 34. May be.

  Further, by attaching the flexible membrane 46 to the integrally vulcanized molded product 28, a fluid sealing region 72 is formed between the main rubber elastic body 16 and the flexible membrane 46, which is fluidly separated from the outside. Incompressible fluid is sealed in the fluid sealing region 72. The fluid sealed in the fluid sealing region 72 is not particularly limited. For example, water, liquid such as ethylene glycol, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof is employed. Furthermore, the incompressible fluid sealed in the fluid sealing region 72 is desirably a low-viscosity fluid of 0.1 Pa · s or less in order to efficiently obtain a vibration isolation effect based on the fluid flow action described later. .

  Further, the partition member 34 is disposed so as to extend in the direction perpendicular to the axis in the fluid sealing region 72, and the fluid sealing region 72 is divided into two vertically by the partition member 34. As a result, a pressure receiving chamber 74 in which a part of the wall portion is constituted by the main rubber elastic body 16 and an internal pressure fluctuation is caused at the time of vibration input is formed above the partition member 34. On the other hand, below the partition member 34, a part of the wall portion is constituted by the flexible film 46, and an equilibrium chamber 76 is formed in which volume change due to deformation of the flexible film 46 is allowed. . The pressure receiving chamber 74 and the equilibrium chamber 76 are each filled with an incompressible fluid.

  Further, the outer peripheral surface of the upper part of the partition member 34 is pressed against the seal rubber layer 32, and the outer peripheral opening of the circumferential groove 40 is closed by the small diameter cylindrical portion 26 of the second mounting member 14 covered with the seal rubber layer 32. Thus, a tunnel-like channel extending in the circumferential direction is formed, and both end portions of the tunnel-like channel communicate with the pressure receiving chamber 74 through the upper communication hole 42 and communicate with the equilibrium chamber 76 through the lower communication hole 44. Has been. Thus, an orifice passage 78 that connects the pressure receiving chamber 74 and the equilibrium chamber 76 to each other is formed by the circumferential groove 40. In the orifice passage 78, the resonance frequency of the flowing fluid is tuned by appropriately adjusting the ratio A / L of the passage cross-sectional area A and the passage length L. In this embodiment, the orifice passage 78 has a frequency of about 10 Hz corresponding to the engine shake. Tuned to low frequency.

  In the engine mount 10 having such a structure, for example, the first attachment member 12 is attached to a power unit (not shown), and the second attachment member 14 is attached to a vehicle body (not shown). The vehicle body is connected in a vibration-proof manner.

  When a low-frequency vibration such as an engine shake is input in the axial direction between the first mounting member 12 and the second mounting member 14 in such a mounting state on the vehicle, the main rubber elastic body 16 is elastically deformed. As a result, the internal pressure of the pressure receiving chamber 74 is fluctuated, and fluid flows through the orifice passage 78 between the pressure receiving chamber 74 and the equilibrium chamber 76. Thereby, based on the fluid action such as the resonance action of the fluid, the intended vibration isolation effect (high damping effect or the like) is exhibited.

  By the way, the engine mount 10 according to the present embodiment is manufactured by, for example, the following manufacturing method.

  First, the first mounting member 12 and the second mounting member 14 prepared in advance are set in a mold for vulcanization molding (not shown) of the main rubber elastic body 16, and the main rubber elastic body 16 is vulcanized. By molding, the process of forming the integrally vulcanized molded product 28 of the main rubber elastic body 16 including the first mounting member 12 and the second mounting member 14 is completed.

  Next, the flexible film 46 is prepared by vulcanization molding, and the protective cup 60 is formed by press working and prepared separately. A cylindrical portion 50, a flange-like portion 52, and a hook portion 54 are integrally provided on the outer peripheral portion of the flexible film 46. Further, a locking projection 70 is provided on the upper end portion of the protective cup 60.

  Then, the step of covering the outer peripheral portion of the flexible film 46 with the outer peripheral surface of the protective cup 60 being overlaid is completed. More specifically, the cylindrical portion 50 of the flexible membrane 46 is inserted into the upper peripheral wall 66 of the protective cup 60, and the flange-shaped portion 52 is protected while the hook portion 54 is elastically deformed so as to extend to the outer periphery. It overlaps with 60 opening end surfaces (upper surface). Thereafter, the deformation of the hook portion 54 is released, and the first locking portion 56 of the hook portion 54 is overlaid on the outer peripheral surface of the locking projection 70 of the protective cup 60, and the second locking portion of the hook portion 54 58 is superposed on the lower surface of the locking projection 70 of the protective cup 60. Thereby, the outer peripheral part of the flexible film | membrane 46 provided with the hook part 54 is covered in the state which can be removed with respect to the upper end part of the protective cup 60 provided with the latching protrusion 70. FIG.

  Next, as shown in FIG. 16, a water tank 80 filled with an incompressible fluid is prepared, and the integrally vulcanized molded product 28 is put into the water tank 80, whereby the integrally vulcanized molded product 28 is uncompressed. Sink in sex fluid. The integrally vulcanized molded product 28 is, for example, rotated in an incompressible fluid, sprayed with a jet, or given an impact, thereby removing the air and then opening the large-diameter recess 30 vertically. The water tank 80 is turned upside down so as to be positioned on the upper side.

  Further, the protective cup 60 covered with the flexible film 46 and the partition member 34 prepared in advance are put in the same water tank 80 as the integrally vulcanized molded product 28, and the integrally vulcanized molded product in an incompressible fluid. Assemble to 28. That is, after the protective cup 60 covered with the flexible membrane 46 is fitted in the cup fitting portion 38 of the partition member 34 in an extrapolated state, the partition member 34 and the flexible membrane 46 combined with each other are combined. As shown in FIG. 17A, the protective cup 60 is inserted into the small diameter cylindrical portion 26 of the second mounting member 14 constituting the integral vulcanized molded product 28 from above. Thereafter, by subjecting the second mounting member 14 to a diameter reduction process such as an eight-way drawing, as shown in FIG. And press against the outer peripheral surface and the protective cup 60. As a result, the partition member 34, the flexible membrane 46, and the protective cup 60 are assembled to the second mounting member 14 at the same time, and the pressure receiving chamber 74 and the equilibrium chamber 76 in which the incompressible fluid is sealed are partitioned into the partition member. The process of forming on both sides of 34 is completed.

  It is to be noted that the partition member 34 and the flexible membrane 46 are desirably removed of air before assembly by impact, jet flow, rotation, or the like in the water tank 80 as in the case of the integrally vulcanized molded product 28. Further, the incompressible fluid that has entered the space between the flexible membrane 46 and the protective cup 60 is discharged through the vent hole 68 when the engine mount 10 is removed from the water tank 80. Further, when the diameter of the second mounting member 14 is reduced, the hook portion 54 of the flexible film 46 is firmly sandwiched between the locking projection 70 of the protective cup 60 and the second mounting member 14 covered with the seal rubber layer 32. For example, the first engaging portion 56 may be broken at the time of or after the flexible film 46 is assembled to the second attachment member 14.

  Further, before the diameter reduction of the second mounting member 14, the inner diameter dimension D 0 of the end protrusion 27 in the second mounting member 14 is made larger than the outer diameter dimension D 2 of the locking protrusion 70 in the protective cup 60. It is made larger than the outer diameter D1 of the hook part 54 (D0> D1> D2). After the diameter reduction of the second mounting member 14, the inner diameter dimension D0 ′ of the end protrusion 27 in the second mounting member 14 is smaller than the inner diameter dimension D0 before the diameter reduction (D0 ′ <D0). The outer diameter D1 ′ of the hook portion 54 is compressed by being pressed against the seal rubber layer 32, so that it becomes smaller than the outer diameter D1 before the diameter reduction (D1 ′ <D1). Then, after the diameter reduction processing of the second mounting member 14, the inner diameter D 0 ′ of the end protrusion 27 in the second mounting member 14 is smaller than the outer diameter D 1 ′ of the hook portion 54. The outer diameter dimension D2 or less (D0 ′ ≦ D2 <D1 ′).

  The engine mount 10 of the present embodiment obtained by such a manufacturing method is flexible because the outer peripheral portion of the flexible membrane 46 is overlapped and covered with the outer peripheral surface of the opening of the protective cup 60. The deformation amount of the outer peripheral portion of the film 46 is limited by the protective cup 60. Therefore, even when the flexible membrane 46 is assembled to the second attachment member 14 in an incompressible fluid, the outer peripheral portion of the flexible membrane 46 is prevented from being deformed by hydraulic pressure, and the second attachment is prevented. Assembling work on the member 14 can be facilitated.

  In the present embodiment, since the hook portion 54 provided at the outer peripheral end of the flexible membrane 46 is put on the locking protrusion 70 provided at the opening of the protective cup 60, the flexible membrane 46 and the protective cup 60 are separated from each other by the hook portion 54 being caught by the locking projection 70, and the outer peripheral portion of the flexible film 46 is held in a state of being attached to the protective cup 60.

  Moreover, the outer peripheral portion of the flexible membrane 46 including the hook portion 54 includes a cylindrical portion 50 that is superimposed on the inner peripheral surface of the protective cup 60, and a flange-shaped portion 52 that extends from the upper end of the cylindrical portion 50 to the outer periphery. The first locking portion 56 that extends downward from the outer peripheral end of the flange-shaped portion 52 and the second locking portion 58 that extends from the lower end of the first locking portion 56 to the inner periphery are provided. . Thus, the upper end portion of the protective cup 60 is sandwiched in the radial direction between the cylindrical portion 50 and the first locking portion 56, and the locking protrusion 70 of the protective cup 60 is connected to the flange-shaped portion 52 and the second locking portion 60. The outer peripheral portion of the flexible film 46 is more strongly attached to the protective cup 60.

  Further, the thickness t1 of the first locking portion 56 and the thickness t2 of the second locking portion 58 in the hook portion 54 are larger than the thickness Ta of the cylindrical portion 50 and the thickness Tb of the flange-shaped portion 52. By making it small, the operation | work which mounts the hook part 54 to the protective cup 60, deform | transforming the thin 1st latching | locking part 56 and the 2nd latching | locking part 58 becomes easy. Moreover, since the thickness Ta of the cylindrical portion 50 and the thickness Tb of the flange-like portion 52 are larger than the thicknesses t1 and t2 of the hook portion 54 provided at the end, the outer periphery of the flexible film 46 The shape stability of the portion is ensured, the mounting state to the protective cup 60 is stably maintained, and the sealing performance between the partition member 34 and the protective cup 60 is also ensured.

  Further, since the deformation amount of the outer peripheral portion of the flexible film 46 is limited by the protective cup 60 provided to protect the flexible film 46 from other members, the deformation amount of the flexible film 46 is reduced. Compared to the case where special parts are provided only for limiting, it is possible to reduce the number of parts and reduce the weight.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the hook portion 54 having an L-shaped cross section including the first locking portion 56 and the second locking portion 58 is not an essential structure in the outer peripheral portion of the flexible film 46. The outer peripheral end of the flexible film 46 may be overlapped with the outer peripheral surface of the protective cup 60 by having a shape in which the outer peripheral end portion extends downward in a cylindrical shape.

  Further, a structure in which the flexible film 46 has a substantially plate shape and the cylindrical portion 50 is not provided on the outer peripheral portion of the flexible film 46 may be employed. That is, for example, the outer peripheral end portion of the flexible film 46 having a substantially plate shape is a portion corresponding to the flange-shaped portion 52 of the above embodiment, and the hook portion 54 is provided at the outer peripheral end portion of the flexible film 46. Provided integrally. The flexible membrane protection member is not limited to a cup shape as long as it allows the deformation of the flexible membrane 46. For example, when the flexible membrane 46 without the cylindrical portion 50 is adopted, A shallow flexible membrane protection member such as a substantially dish shape may be employed.

  The locking protrusion 70 provided at the opening of the protective cup 60 is not essential. For example, the protective cup 60 without the locking protrusion 70 and the flexible film 46 without the hook portion 54 can be used in combination.

  The partition member 34, the flexible membrane 46, and the protective cup 60 do not necessarily have to be assembled to the second mounting member 14 of the integrally vulcanized molded product 28 by reducing the diameter of the second mounting member 14. . Specifically, for example, the partition member 34, the flexible film 46, and the protective cup 60 that are combined with each other are press-fitted into the second mounting member 14 to be assembled to the second mounting member 14. You can also.

  The structure of the partition member 34 shown in the embodiment is merely an example. For example, a plurality of orifice passages having different tuning frequencies may be provided, or a movable member that exhibits a vibration-proofing effect against high-frequency small-amplitude vibrations. Alternatively, a short-circuit mechanism for preventing cavitation can be provided.

  In the above embodiment, the example in which the present invention is applied to the engine mount 10 has been described. However, the present invention can also be applied to other fluid-filled vibration isolator such as a subframe mount. Furthermore, the present invention is not only applied to a fluid-filled vibration isolator for automobiles but can also be applied to a fluid-filled vibration isolator used for motorcycles, railway vehicles, industrial vehicles, and the like.

10: engine mount (fluid-filled vibration isolator), 12: first mounting member, 14: second mounting member, 16: main rubber elastic body, 28: integrally vulcanized molded product, 32: seal rubber layer, 34 : Partition member, 46: flexible membrane, 50: cylindrical portion, 52: flange-like portion, 54: hook portion, 56: first locking portion, 58: second locking portion, 60: protective cup (Flexible membrane protection member), 70: locking projection, 74: pressure receiving chamber, 76: equilibrium chamber, 78: orifice passage, 80: water tank

Claims (7)

The first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and a pressure receiving chamber in which a part of the wall portion is configured by the main rubber elastic body and a part of the wall portion are allowed. An equilibrium chamber made of a flexible film is formed on both sides of a partition member arranged in an interpolated state with respect to the second mounting member, and an incompressible fluid is enclosed in the pressure receiving chamber and the equilibrium chamber. In the fluid-filled vibration isolator in which the pressure receiving chamber and the equilibrium chamber are communicated with each other through the orifice passage,
The second mounting member in a state where the outer peripheral portion of the flexible membrane is superimposed on the outer peripheral surface of the flexible membrane protecting member disposed so as to cover the opposite side of the flexible membrane to the partition member A fluid-filled vibration damping device, wherein   The flexible membrane protection member has a cup shape, and a locking projection that protrudes to the outer peripheral side is integrally formed at the opening end of the flexible membrane protection member, and is hooked on the locking projection. The fluid-filled vibration isolator according to claim 1, wherein a hook portion to be provided is provided on an outer peripheral portion of the flexible film.   The outer peripheral portion of the flexible membrane is superimposed on the opening-side surface of the flexible membrane protecting member in the locking projection, and the hook portion provided on the outer peripheral portion of the flexible membrane is: A first locking portion superimposed on the outer peripheral surface of the locking projection, and a second locking portion superimposed on a surface of the locking projection opposite to the opening of the flexible film protection member. The fluid-filled vibration isolator according to claim 2 provided.   A cylindrical portion that extends toward the partition member is integrally provided on the outer peripheral portion of the flexible membrane, and a flange-shaped portion that protrudes toward the outer periphery is integrally formed at the end of the cylindrical portion. 4. The fluid according to claim 2, wherein the hook portion is provided so as to protrude from an outer peripheral end portion of the flange-like portion, and the hook portion is thinner than the flange-like portion. Enclosed vibration isolator.   The flexible membrane protection member is inserted between the second mounting member and the partition member, and a cylindrical portion provided on an outer peripheral portion of the flexible membrane is the partition member and the flexible member. The fluid filled type vibration damping device according to any one of claims 1 to 4, wherein the fluid filled type vibration damping device is sandwiched between membrane protection members.   The fluid-filled type prevention according to any one of claims 1 to 5, wherein an inner peripheral surface of the second attachment member to which the flexible membrane protection member is attached in an inserted state is covered with a seal rubber layer. Shaker. A step of elastically connecting the first mounting member and the second mounting member with a main rubber elastic body to form an integrally vulcanized molded product;
A step in which an outer peripheral portion of a flexible film prepared in advance is separately prepared in advance and overlaid on an outer peripheral surface of a flexible film protection member that covers the flexible film;
The second attachment of the integrally vulcanized molded product in a water tank filled with an incompressible fluid, comprising a partition member prepared in advance and the flexible membrane protection member covered with the flexible membrane. Incompressible fluid is enclosed by fluid tightly assembling the partition member and the flexible membrane protection member covered with the flexible membrane to the second mounting member by interpolating with respect to the member. Forming a pressure receiving chamber and an equilibrium chamber formed on both sides of the partition member.

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