JP5711088B2 - Fluid-filled vibration isolator and manufacturing method thereof - Google Patents

Description

  The present invention relates to a fluid-filled vibration isolator and a method for manufacturing the same, and in particular, has a plurality of liquid chambers filled with an incompressible fluid and is based on the fluid flow action between the plurality of liquid chambers. The present invention relates to an improved structure of a fluid-filled vibration isolator capable of obtaining a vibration isolating effect and a method for advantageously manufacturing such a fluid-filled vibration isolator.

  Conventionally, as an anti-vibration coupling body or an anti-vibration support body interposed between members constituting the vibration transmission system, an anti-vibration effect has been obtained by utilizing a fluid action of a fluid sealed inside. A fluid-filled vibration isolator is known. As a kind of such a fluid-filled vibration isolator, a first attachment member attached to one of the two members to be anti-vibration connected is a substantially cylindrical second attached to the other of them. The first mounting member and the second mounting member are connected to each other by the main rubber elastic body on the one opening side in the axial direction of the mounting member, and the second mounting member is connected. One of the axial openings of the second mounting member is fluid-tightly covered, while the other axially-opening opening of the second mounting member is fluid-tightly covered with a flexible film, whereby the main rubber elastic body and the flexible film are covered. Forming a fluid chamber in which an incompressible fluid is sealed between the fluid chambers and accommodating and arranging a partition member inside the fluid chamber to partition the fluid chamber on both sides in the axial direction of the second mounting member, A main liquid chamber in which a part of the wall part is composed of a main rubber elastic body, and a part of the wall part is a flexible membrane And a sub liquid chamber formed on both sides of the partition member, and the main liquid chamber and the sub liquid chamber communicate with each other in an orifice passage provided in the partition member. Some have Such a fluid-filled vibration isolator is a rubber based on the resonance action of the fluid flowing in the orifice passage due to the relative pressure fluctuation caused between the main liquid chamber and the sub liquid chamber at the time of vibration input. A vibration isolation effect that is difficult to obtain with only an elastic body can be obtained, and is suitably used, for example, as an engine mount or body mount for automobiles.

  By the way, as clarified in, for example, Japanese Patent Application Laid-Open No. 2006-275255 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2009-156431 (Patent Document 2), the conventional fluid-filled vibration isolator as described above has many. In this case, the flexible membrane is configured as an integrally vulcanized molded product in which a ring-shaped or cylindrical support fitting is vulcanized and bonded to the outer peripheral edge of the rubber thin film. Then, in such a state that such a flexible membrane is accommodated in the cylindrical second mounting member and the support fitting is disposed coaxially with the second mounting member, the second mounting By reducing the diameter of the member, the support fitting is clamped and fixed on the inner peripheral surface of the second mounting member. Thus, the flexible membrane can be attached to the second mounting member in a state where the opening opposite to the opening covered by the main rubber elastic body of the second mounting member is fluid-tightly covered. It has become.

  In the conventional fluid-filled vibration isolator having such a structure, generally, the first mounting member and the second mounting member are connected by the main rubber elastic body, and one axial direction of the second mounting member is An intermediate molded body made of an integrally vulcanized molded product whose opening is covered fluid-tightly, a flexible membrane to which a support fitting is vulcanized and bonded, and a partition member are immersed in a predetermined incompressible fluid Then, in a state in which the partition member and the flexible film are accommodated in the intermediate molded body, the support member for the flexible film and the partition member are formed by reducing the diameter of the second mounting member. It is clamped and fixed on the inner peripheral surface of the second mounting member. Thus, a fluid chamber in which an incompressible fluid is sealed is formed between the main rubber elastic body and the flexible film, and at the same time, a main liquid chamber and a sub liquid chamber are formed at once and efficiently. It can be done.

  However, in such a conventional fluid-filled vibration isolator, since the flexible membrane is constituted by an integrally vulcanized molded product having a support fitting, for example, the flexible membrane is constituted by a single rubber member. Compared to the case where the support bracket is used, the number of parts is increased by the use of the support bracket, and an extra step for vulcanizing and bonding the support bracket to the flexible membrane is performed during manufacturing. There was a need to do. Therefore, such a conventional fluid-filled vibration isolator still has room for improvement in terms of manufacturing cost and manufacturability.

  On the other hand, for example, as disclosed in JP-A-8-4823 (Patent Document 3) and the like, a fluid-filled vibration isolator having a flexible film made of a single rubber member has also been conventionally used. Exists from. However, in this fluid-filled vibration isolator, the outer peripheral portion of the flexible membrane is separated from the partition member and the second mounting member, which is disposed opposite the partition member on the side of the secondary liquid chamber. Between the two mounting members in the axial direction of the second mounting member. That is, in such a conventional fluid-filled vibration isolator, the support metal fitting is omitted from the flexible membrane, but the flexible membrane can be attached from a member separate from the partition member and the second attachment member. A bottom fitting was required. Therefore, in such a conventional fluid-filled vibration isolator, there is no reduction in the number of parts compared to the case where a flexible film made of an integrally vulcanized molded product of a rubber thin film and a support metal fitting is used. If the bottom metal fitting is omitted, the flexible membrane could not be attached.

  Moreover, in such a fluid-filled vibration isolator, the bottom metal fitting is caulked and fixed to the end of the second mounting member on the side of the secondary liquid chamber. Therefore, when the partition member is clamped and fixed on the inner peripheral surface of the second mounting member due to the reduced diameter of the second mounting member, the diameter of the second mounting member is reduced and crimped. One process had to be performed, which could reduce manufacturability. Further, in such a fluid filled type vibration isolator, in order to smoothly and surely perform the caulking process on the second mounting member, the direction perpendicular to the axis with respect to the end of the second mounting member on the sub liquid chamber side A shoulder portion protruding outward is provided around the periphery. Therefore, there is a problem that the size of the second mounting member, and hence the fluid-filled vibration isolator, in the direction perpendicular to the axis is inevitably increased.

JP 2006-275255 A JP 2009-156431 A JP-A-8-4823

  Here, the present invention has been made in the background as described above, and the solution is to connect the first mounting member and the cylindrical second mounting member to each other. A flexible membrane that forms a fluid chamber in which an incompressible fluid is sealed is formed between the main rubber elastic body and the entire apparatus without increasing the size of the apparatus. The fluid-filled vibration isolator effectively reducing the manufacturing cost and improving the manufacturability by being advantageously fixed by performing the process, and such a characteristic fluid-filled vibration isolator It is to provide a method that can be advantageously manufactured.

  And in this invention, in order to solve this subject, a 1st attachment member is made into this 2nd attachment member on the one opening part side of the axial direction of the 2nd attachment member which exhibits a cylindrical shape. The first mounting member and the second mounting member are connected to each other by a main rubber elastic body, and one axial opening of the second mounting member is fluid-tightly covered. On the other hand, the other opening in the axial direction of the second mounting member is covered with a flexible membrane in a fluid-tight manner so that an incompressible fluid is interposed between the main rubber elastic body and the flexible membrane. A sealed fluid chamber is formed, a partition member is accommodated in the fluid chamber, and the fluid chamber is partitioned on both sides in the axial direction of the second mounting member. The partition member is sandwiched between a main liquid chamber made of a rubber elastic body and a sub-liquid chamber in which a part of the wall is made of the flexible film. In the fluid-filled vibration isolator formed on both sides and having an orifice passage in the partition member that communicates the main liquid chamber and the sub liquid chamber with each other, the surface of the partition member on the side of the sub liquid chamber An annular or cylindrical clamping protrusion is provided so as to extend coaxially with the second mounting member, and the outer peripheral portion of the flexible film is connected to the outer peripheral surface of the clamping protrusion. The gist of the fluid-filled vibration isolator characterized by being sandwiched and fixed by the reduced diameter of the second mounting member between the inner peripheral surface of the second mounting member.

  According to one of the preferred embodiments of the present invention, an annular or cylindrical outer peripheral wall portion is erected integrally with the outer peripheral portion of the surface of the flexible film on the side of the secondary liquid chamber. The outer peripheral wall portion is clamped and fixed between the outer peripheral surface of the clamping protrusion and the inner peripheral surface of the second mounting member.

  Further, according to one of the advantageous aspects of the present invention, the first engaging portion is provided on the outer peripheral surface of the holding protrusion, and between the holding protrusion and the second mounting member. The outer peripheral wall portion of the flexible film is engaged with the first engaging portion in the axial direction of the second attachment member, and the holding projection and the second A second engaging portion for preventing the outer peripheral wall portion from coming off from the mounting member is provided on the inner peripheral surface of the outer peripheral wall portion.

  Furthermore, according to one of the desirable aspects of the present invention, an interval between the outer peripheral wall portion and the outer peripheral wall portion in the outer peripheral portion of the surface of the flexible film on the side of the secondary liquid chamber is spaced from the outer peripheral wall portion. An annular or cylindrical inner peripheral wall portion extending coaxially and spaced apart is integrally provided, and an inner peripheral surface and an inner peripheral wall of the outer peripheral wall portion are provided between the outer peripheral wall portion and the inner peripheral wall portion. A concave groove into which the pinching protrusion is inserted is formed with the outer peripheral surface of the portion as both side surfaces.

  Furthermore, according to one of the preferred embodiments of the present invention, the inner peripheral surface portion of the second mounting member that clamps and fixes the outer peripheral portion of the flexible film with the outer peripheral surface of the clamping protrusion. A sealing rubber layer is provided, and the outer peripheral portion of the flexible membrane is sandwiched and fixed between the outer peripheral surface of the clamping protrusion and the inner peripheral surface of the second mounting member via the sealing rubber layer. The Rukoto.

According to another advantageous aspect of the present invention, an inner flange portion is integrally provided at an end of the second mounting member on the other opening side in the axial direction, and the clamping is performed. The inner flange portion is connected to the auxiliary liquid chamber side of the outer peripheral portion of the flexible membrane under a state in which the outer peripheral portion of the flexible membrane is clamped and fixed between the projection for use and the second mounting member. for surface opposite to engage in the axial direction of the second mounting member, omission of the outer peripheral portion of the flexible film from between the clamping projection and the second mounting member Is configured to be blocked.

  In the present invention, the first mounting member is arranged on the one opening side in the axial direction of the second mounting member having a cylindrical shape and is spaced apart from the second mounting member in the axial direction. The first mounting member and the second mounting member are connected by a main rubber elastic body, and one opening in the axial direction of the second mounting member is fluid-tightly covered, while the second mounting member A fluid chamber in which an incompressible fluid is sealed is formed between the main rubber elastic body and the flexible film by covering the other axially opening of the member fluid-tightly with a flexible film. In addition, a partition member is housed and arranged inside the fluid chamber, and the fluid chamber is partitioned on both sides in the axial direction of the second mounting member, so that a part of the wall portion is configured by a main rubber elastic body. A main liquid chamber and a secondary liquid chamber, part of which is made of the flexible membrane, are formed on both sides of the partition member, and A fluid-filled vibration isolator having an orifice passage communicating with the main liquid chamber and the sub liquid chamber in the partition member, wherein: (a) the first attachment member is the second attachment member; The first mounting member and the second mounting member are arranged on the one opening side of the mounting member in the axial direction so as to be spaced apart from the second mounting member in the axial direction. A step of preparing an intermediate molded body in which one axial opening of the second mounting member is fluid-tightly covered with the second mounting member, and (b) one of the thickness direction as the partition member A step in which an annular or cylindrical clamping protrusion is provided so as to extend coaxially with the second attachment member, and (c) the intermediate molded body and the surface While the partition member and the flexible membrane are immersed in a predetermined incompressible fluid, the second attachment portion The inner side of the second mounting member is positioned on both sides in the axial direction with the other surface in the thickness direction facing the other opening in the axial direction of the second mounting member. And inserting the outer peripheral portion of the flexible membrane between the outer peripheral surface of the clamping protrusion of the partition member and the inner peripheral surface of the second mounting member, A step of covering the other opening in the axial direction of the second mounting member with the flexible film; and (d) the partition member is accommodated and arranged on the inner side, and the other axial direction in the flexible film. The diameter-reducing process for the second mounting member covered with the opening is performed in the incompressible fluid, and the partition member is clamped and fixed on the inner peripheral surface of the second mounting member. The partition portion is formed by sandwiching and fixing the outer peripheral portion of the flexible film between the outer peripheral surface of the holding projection and the inner peripheral surface of the second mounting member. Forming the main liquid chamber and the sub liquid chamber on both sides of the material in a state of being in communication with each other through the orifice passage of the partition member. The manufacturing method of the vibration device is also the gist thereof.

  That is, in the fluid-filled vibration isolator according to the present invention, even if the flexible film is formed of a single member made of rubber, for example, without a support fitting or the like being vulcanized and bonded to the outer peripheral edge, The flexible membrane can be securely fixed to the axial end side of the second mounting member without using any extra parts such as metal fittings, thereby advantageously reducing the number of parts. Can be. Also, the partition member and the flexible membrane can be connected to the fluid-filled type vibration-proof without any extra processing other than reducing the diameter of the second mounting member, such as caulking and fixing of the bottom metal fitting to the second mounting member. It can be fixed to the device at once. Moreover, since the bottom metal fitting is not fixed to the second mounting member at all, it is not necessary to form a shoulder portion used when performing such a caulking fixing on the second mounting member. It can be effectively avoided that the mounting member, and thus the entire apparatus, is enlarged due to the formation of the shoulder portion.

  Therefore, in the fluid filled type vibration isolator according to the present invention as described above, the flexible film can be implemented at an as low cost as possible and an efficient process without increasing the size of the entire apparatus. As a result, a reduction in manufacturing cost and an improvement in manufacturability can be realized extremely effectively.

  Even in the method for manufacturing a fluid-filled vibration isolator according to the present invention, substantially the same functions and effects as those exhibited in the fluid-filled vibration isolator according to the present invention described above can be enjoyed effectively. It can be done.

It is longitudinal cross-sectional explanatory drawing which shows one Embodiment of the fluid enclosure type vibration isolator which has a structure according to this invention. It is a longitudinal cross-sectional explanatory drawing which shows the partition member with which the fluid enclosure type vibration isolator shown by FIG. 1 is mounted | worn, Comprising: It is a figure equivalent to the II-II cross section of FIG. It is III arrow explanatory drawing of FIG. It is IV arrow explanatory drawing of FIG. FIG. 5 is a longitudinal cross-sectional explanatory view showing a flexible membrane attached to the fluid-filled vibration isolator shown in FIG. 1, corresponding to a VV cross section of FIG. 6. It is VI arrow explanatory drawing of FIG. It is the A section enlarged explanatory view of FIG. It is explanatory drawing which shows the example of 1 process at the time of manufacturing the fluid enclosure type vibration isolator shown in FIG. 1 according to this invention method, Comprising: An intermediate molded object, a partition member, and flexibility in an incompressible fluid The state which immersed the film | membrane is shown. It is a figure for demonstrating the process implemented following FIG. 8, Comprising: In the incompressible fluid, the state which accommodated and arrange | positioned the partition member and the flexible film | membrane in the intermediate molded object is shown. FIG. 10 is a diagram for explaining a process performed subsequent to FIG. 9, in which a diameter reduction process is performed on an intermediate molded body in which a partition member and a flexible film are accommodated in an incompressible fluid. The state which fixed the partition member and the flexible film | membrane to the intermediate molded object is shown. It is a figure corresponding to FIG. 1 which shows another embodiment of the fluid-filled type vibration isolator which has a structure according to this invention. It is the B section enlarged explanatory view of FIG.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 schematically shows an automotive engine mount as an embodiment of a fluid-filled vibration isolator having a structure according to the present invention in a vertical cross-sectional form. As apparent from FIG. 1, the automobile engine mount of the present embodiment (hereinafter simply referred to as the engine mount) includes a first mounting member 10 as a first mounting member and a second mounting member. The first mounting bracket 10 and the second mounting bracket 12 are spaced apart from each other in the axial direction (vertical direction in FIG. 1) of the second mounting bracket 12. The main rubber elastic body 14 is elastically connected to each other.

  The first mounting bracket 10 is attached to the power unit of the automobile, while the second mounting bracket 12 is attached to the body of the automobile, so that the power unit is supported by the body against vibration. Further, under such a mounted state, the main rubber elastic body 14 is elastically deformed due to the weight of the power unit, and the first mounting bracket 10 and the second mounting bracket 12 are arranged close to each other. Is done. Under such a mounted state, the main vibration to be damped is the approach / separation direction between the first mounting bracket 10 and the second mounting bracket 12 (in the direction of the center axis of the engine mount, which is abbreviated in FIG. 1). Input in the vertical direction). For convenience, in the following description, the vertical direction refers to the vertical direction in FIG.

  More specifically, the first mounting bracket 10 has a substantially cylindrical shape. An outer flange portion 15 that protrudes a predetermined dimension radially outward and continuously extends in the circumferential direction is integrally formed at the upper end portion of the first mounting bracket 10, and at the center portion of the upper end surface, A female screw hole 16 extending in the axial direction is provided. The first mounting bracket 10 is fixedly attached to the power unit by screwing a mounting bolt fixed to the power unit (not shown) into the female screw hole 16. In FIG. 1, reference numeral 17 denotes a positioning pin.

  On the other hand, the second mounting bracket 12 has a substantially cylindrical shape as a whole. Further, in the second mounting bracket 12, a stepped portion 18 is provided at an intermediate portion in the axial direction, and an upper portion of the stepped portion 18 is a large diameter portion 20. The lower portion of the attaching portion 18 is a small diameter portion 22 having a diameter smaller than the large diameter portion 20 by a predetermined dimension. Further, the peripheral edge of the lower opening that is the end opposite to the large-diameter portion 20 side of the small-diameter portion 22 in the second mounting bracket 12 protrudes inward in the radial direction and protrudes in the circumferential direction. An inner flange portion 24 extending continuously is integrally formed.

  The first mounting bracket 10 is spaced above the second mounting bracket 12 and is disposed substantially coaxially with the second mounting bracket 12. A main rubber elastic body 14 is interposed between the second mounting bracket 12.

  The main rubber elastic body 14 as a whole has a substantially frustoconical shape with a large diameter, and has a recess 26 that opens downward on the large diameter side end surface (lower end surface). In the main rubber elastic body 14, the first rubber fitting 10 has a main rubber elasticity at a portion other than the upper end portion where the outer flange portion 15 is integrally formed with respect to the end surface (upper end surface) on the small diameter side. The entire inner peripheral surface and the small diameter portion of the large diameter portion 20 of the second mounting bracket 12 with respect to the large diameter side end surface surrounding the recess 26 while being vulcanized and bonded while being embedded in the body 14. The upper end side portion of the inner peripheral surface 22 is vulcanized and bonded. In short, the main rubber elastic body 14 is formed as an integrally vulcanized molded product including the first mounting bracket 10 and the second mounting bracket 12. As a result, the upper opening of the second mounting bracket 12 is fluid-tightly covered with the main rubber elastic body 14.

  Note that an inner seal rubber layer 28 that covers substantially the entire surface of the inner peripheral surface and the lower end side portion of the inner peripheral surface of the small diameter portion 22 in the second mounting bracket 12 is integrated with the main rubber elastic body 14. Is formed. The inner seal rubber layer 28 also covers the entire upper surface and the entire front end surface of the inner flange portion 24 integrally formed at the lower end portion of the small diameter portion 22.

  In addition, a diaphragm 30 as a flexible film is provided inside the lower end portion of the small-diameter portion 22 of the second mounting bracket 12, and a lower opening (the large-diameter portion 20 of the small-diameter portion 22). (The opening on the side opposite to the side) is disposed so as to cover the whole. The diaphragm 30 has a thin disk shape that is slack so that it can be easily deformed. Then, as will be described later, such a diaphragm 30 is attached to the lower end portion of the second mounting bracket 12 so as to cover the lower opening thereof fluid-tightly.

  Thus, in the engine mount of this embodiment, the incompressible fluid 31 is sealed between the opposing surfaces of the main rubber elastic body 14 and the diaphragm 30 that cover the upper and lower sides (both sides in the axial direction) of the second mounting bracket 12. A fluid chamber 32 is formed. As the incompressible fluid 31, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is adopted. In particular, in order to advantageously obtain a vibration isolation effect based on the resonance action of the fluid described later, this embodiment is implemented. In the form, a low viscosity fluid of 0.1 Pa · s or less is suitably employed.

  In addition, a partition member 34 is accommodated in the second mounting member 12 and assembled in the fluid chamber 32. The partition member 34 has a substantially thick disk shape as a whole, and the partition member 34 is fixed to the second mounting member 12 in a state where the partition member 34 spreads in the direction perpendicular to the axis in the fluid chamber 32. Thus, the fluid chamber 32 is partitioned on both upper and lower sides with the partition member 34 interposed therebetween. On the upper side of the partition member 34, a pressure receiving chamber serving as a main liquid chamber is formed of an inner space of the recess 26 of the main rubber elastic body 14 and a part of the wall portion is configured by the main rubber elastic body 14. On the other hand, an equilibration chamber 38 as a sub-liquid chamber is formed below the partition member 34, and a part of the wall portion is constituted by the diaphragm 30. That is, in the pressure receiving chamber 36, vibration is input along with elastic deformation of the main rubber elastic body 14 when vibration is input, and an internal pressure fluctuation is generated, while the equilibrium chamber 38 is based on deformation of the diaphragm 30. Thus, the volume change is easily allowed and the internal pressure change is absorbed.

  The partition member 34 that divides the fluid chamber 32 into two and defines the pressure receiving chamber 36 and the equilibrium chamber 38 is formed by stacking the partition member main body 40 and the lid body 42 and assembling them. ing.

  As shown in FIGS. 2 to 4, the partition member main body 40 is formed of a substantially circular block body having a predetermined thickness and formed using a hard synthetic resin material or a metal material such as an aluminum alloy. . A circular recess 44 is provided at the center of the upper surface of the partition member main body 40, and a through hole 46 having a large-diameter circular shape is formed at the bottom of the circular recess 44. .

  Further, a circumferential groove 48 that opens toward the side is formed on the outer peripheral surface of the partition member main body 40 so as to continuously extend with a length that is less than one round. Furthermore, a rectangular notch 50 is provided on the outer peripheral portion of the upper surface of the partition member main body 40 at a position corresponding to one circumferential end of the peripheral groove 48, while the peripheral groove is provided on the outer peripheral portion of the lower surface. A substantially oval through hole 52 is provided at a position corresponding to the other circumferential end of 48. Thus, the circumferential groove 48 opens upward through the notch 50 at one circumferential end, and opens downward through the through hole 52 at the other circumferential end. Thus, here, the notch 50 is an upper opening 54 that opens the circumferential groove 48 upward at one end in the circumferential direction, and the through-hole 52 defines the circumferential groove 48. A lower opening 56 is formed to open downward at the other end in the circumferential direction.

  On the other hand, as is apparent from FIGS. 2 and 3, the lid body 42 is made of an annular plate having a circular center hole 58 and is formed using a hard synthetic resin material or a metal material such as an aluminum alloy. . The lid body 42 has an outer diameter slightly smaller than the inner diameter of the circular recess 44 of the partition member main body 48 and a thickness smaller than the depth of the circular recess 44 by a predetermined dimension. The diameter of the hole 58 is substantially the same as the diameter of the circular through hole 46 provided in the partition member main body 40.

  Then, such a lid body 42 is fitted into the circular recess 44 so as to communicate with the partition member main body 40 through the central hole 58 and the through hole 46, and overlapped with the bottom surface of the circular recess 44. It is assembled in the state. Further, under such an assembled state, the outer peripheral surface of the lid 42 and the inner peripheral surface of the circular recess 44 of the partition member main body 40 are, for example, welded, bonded, or welded, and the partition member main body 40 and the lid 42. It is integrally joined by a joining method corresponding to the material and the like. Thus, the partition member 34 is configured as an integral assembly of the partition member main body 40 and the lid body 42. A circular through hole 60 penetrating in the thickness direction is formed in the center of the partition member 34 by a central hole 58 and a through hole 46 that communicate with each other.

  Further, such a partition member 34 has a movable plate 62. The movable plate 62 is thicker than the diaphragm 30 and has a diameter larger than the diameter of the through hole 60 of the partition member 34 (the diameter of each of the through hole 46 of the partition member main body 40 and the center hole 58 of the lid body 42). It is comprised with the rubber plate which has. Such a movable plate 62 is sandwiched and fixed at the outer peripheral portion between the outer peripheral portion of the bottom surface of the circular recess 44 of the partition member main body 40 and the lower surface of the lid body 42.

  Thereby, the movable plate 62 is fluid-tightly connected to the upper opening side and the lower opening side at the center hole 60 at a portion closer to the center than the outer peripheral portion sandwiched between the partition member main body 40 and the lid body 42. In such a state, the center side portion of the movable plate 62 is arranged in the vertical direction in the center hole 60 so as to be partitioned in the vertical direction. Elastic deformation is possible in the thickness direction.

  As shown in FIG. 1, the partition member 34 having the above-described structure is coaxial with the second mounting bracket 12 in the second mounting bracket 12 (fluid chamber 32) and in the direction perpendicular to the axis. And the lid 42 is disposed on the upper side. In addition, under this arrangement state, as described later, the second mounting bracket 12 is subjected to drawing processing and the like, and the second mounting bracket 12 is reduced in diameter, so that the partition member 34 becomes the inner seal rubber layer. 28, the inner diameter of the small diameter portion 22 of the second mounting member 12 is clamped and held and fixed.

  Further, under such a state where the partition member 34 is fixed in the fluid chamber 32, the upper surface of the partition member 34 is exposed in the pressure receiving chamber 44, while the lower surface thereof is exposed in the equilibrium chamber 46. Yes. The upper opening 54 provided on the upper surface of the partition member 34 opens into the pressure receiving chamber 44, while the lower opening 56 provided on the lower surface thereof opens into the equilibrium chamber 46. Yes.

  Further, under the state in which the partition member 34 is fixed in the fluid chamber 32, the side opening of the circumferential groove 48 provided in the partition member main body 40 of the partition member 34 extends over the entire circumference of the circumferential groove 48. The second mounting bracket 12 is fluid-tightly covered with an inner sealing rubber layer 28 fixed to the inner peripheral surface of the small-diameter portion 22 of the second mounting bracket 12. Accordingly, the orifice passage 64 including the circumferential groove 48 receives pressure through the upper opening 54 provided in the lid 42 and the lower opening 56 provided in the partition member main body 40 with respect to the partition member 34. It is formed in a state where it communicates with the chamber 36 and the equilibrium chamber 38. The fluid flow between the pressure receiving chamber 36 and the equilibrium chamber 38 is allowed through the orifice passage 64.

  Thus, in the engine mount of the present embodiment, between the first mounting bracket 10 and the second mounting bracket 12 in the mounted state on the automobile, the approach / separation direction (in FIG. When a vibration in the vertical direction is input, based on the fact that a relative pressure difference is generated between the pressure receiving chamber 36 and the equilibrium chamber 38, the non-compression through the orifice passage 64 is established between the chambers 36 and 38. The flow of the sexual fluid 31 occurs. In this case, the orifice passage 64 is tuned to a low frequency region, so that when the low frequency large amplitude vibration is inputted, the orifice passage 64 is based on the resonance action of the incompressible fluid 31 flowing through the orifice passage 64. Effective anti-vibration effect.

  Further, in the engine mount of the present embodiment, the upper surface of the movable plate 62 disposed so as to bisect the center hole 58 in the vertical direction with respect to the partition member 34 is an opening above the center hole 58. In the pressure receiving chamber 36, the lower surface thereof is exposed in the equilibrium chamber 38 through the lower opening of the center hole 58. Accordingly, the movable plate 62 is elastically deformed toward the pressure receiving chamber 36 or the equilibrium chamber 38 (vertical direction) based on the internal pressure difference between the pressure receiving chamber 36 and the equilibrium chamber 38. When medium to high frequency small amplitude vibration is input, based on such elastic deformation action of the movable plate 62, an effective low dynamic spring effect is exhibited and an excellent vibration insulation effect can be obtained. Yes.

  In the engine mount of the present embodiment, the lower opening is fixed to the second mounting bracket 12 so as to cover the fluid tightly, and the equilibrium chamber 38 between the partition member 34 and the second mounting bracket 12 is fixed. The diaphragm 30 that forms the diaphragm 30 has a special structure, and the structure for fixing the diaphragm 30 to the second mounting member 12 includes the diaphragm 30 and the partition member 34 at the outer periphery thereof. This is a special structure that is sandwiched and fixed between the second mounting bracket 12 and is not found in the conventional apparatus.

  More specifically, as is apparent from FIGS. 1, 5 and 6, the diaphragm 30 is a diaphragm made of an integrally vulcanized molded product attached to a conventional apparatus and vulcanized and bonded to a ring-shaped support fitting or the like. In contrast to this, it is composed of a thin and round rubber plate made of a single rubber member that does not have any support metal fittings.

  And in this diaphragm 30, it is outside with respect to the outer peripheral part (outer peripheral part) of the upper surface, ie, the surface which becomes the pressure receiving chamber 36 side in the fixed state to the 2nd mounting bracket 12 of the diaphragm 30. The peripheral wall portion 66 is erected by integral formation. The outer peripheral wall portion 66 is formed of a rubber ring or cylinder that protrudes upward at a predetermined height along the central axis extending in the thickness direction of the diaphragm 30 and continuously extends in the circumferential direction. It has substantially the same thickness as that of the center side portion relative to the peripheral portion. As a result, the outer peripheral edge of the diaphragm 30 is harder than the other parts.

  Further, an annular engagement convex portion 68 as a second engagement portion is integrally provided on the inner peripheral surface portion on the distal end side of such an outer peripheral wall portion 66. The annular engaging convex portion 68 has a protruding shape that protrudes toward the central axis side of the diaphragm 30 at a predetermined height and continuously extends in the circumferential direction of the outer peripheral side peripheral wall portion 66. And in this annular engagement convex part 68, the guide tip which consists of a taper surface where the protrusion front end surface (inner peripheral surface) expands gradually toward the upper direction (toward the front end of the outer peripheral side peripheral wall part 66). On the other hand, the lower side surface (lower surface) of the surface 70 is an engagement surface 72 formed of a flat annular surface that extends horizontally.

  Furthermore, an annular recess 74 is formed in the inner peripheral surface portion of the outer peripheral wall portion 66 on the base side. The annular recess 74 has an engagement surface 72 of the annular engagement projection 68 and an upper surface portion of the outer periphery of the diaphragm 30 positioned opposite to the engagement surface 72 on both sides, and an annular engagement of the outer peripheral wall 66. It has a concave groove shape with the inner peripheral surface portion on the base side of the joint convex portion 68 as the bottom surface. Further, the bottom surface of the annular recess 74 has a cylindrical surface shape extending in the vertical direction with a constant diameter.

  On the other hand, as shown in FIGS. 1, 2, and 4, the lower surface of the partition member 34 (partition member main body 40), that is, the equilibrium member 38 side is located in a state where the partition member 34 is disposed in the fluid chamber 32. On the outer peripheral portion of the surface, a clamping protrusion 76 is erected in an integrated manner. The pinching protrusion 76 protrudes downward along the central axis of the partition member 34 and continues in the circumferential direction, and has an annular shape or a cylindrical shape with a low height extending coaxially with the partition member 34.

  An annular engagement convex portion 78 as a first engagement portion is integrally provided around the outer peripheral surface portion on the distal end side of the sandwiching projection 76. The annular engagement convex part 78 has a protrusion shape that protrudes at a predetermined height toward the side opposite to the central axis side of the partition member 34 and continuously extends in the circumferential direction of the sandwiching protrusion 76. . And in this annular engagement convex part 78, the protruding front end surface (outer peripheral surface) is a front end side clamping surface 80 formed of a cylindrical surface extending in the vertical direction (axial direction) with a constant diameter. The upper side surface (upper surface) is an engaging surface 82 formed of a flat annular surface that spreads horizontally.

  Further, an annular recess 84 is formed on the outer peripheral surface portion of the clamping protrusion 76 on the base side. The annular recess 84 has both sides of the engaging surface 82 of the sandwiching protrusion 76 and the lower surface of the outer peripheral portion of the partition member 34 (partition member main body 40) facing the engaging surface 82, and the sandwiching protrusion 84. The shape of the concave groove is such that the outer peripheral surface portion closer to the base side than the 76 annular engagement convex portions 78 is the bottom surface.

  The bottom surface of the annular recess 84 is a base-side clamping surface 86. The base side clamping surface 86 is a taper surface corresponding to the guide surface 70 of the annular engagement convex portion 68 of the outer peripheral wall portion 66 formed integrally with the upper surface of the outer peripheral portion of the diaphragm 30, that is, substantially the same as the guide surface 70. It has a tapered surface shape that gradually increases in diameter toward the upper side with a taper angle.

Here, the width of the annular engaging projection 78 of the clamping projection 76 (the dimension indicated by W _{1 in} FIG. 2) is the width of the annular recess 74 of the diaphragm 30 (W _{2 in} FIG. 5). The dimension is substantially the same as or slightly smaller than (dimension). Further, the width of the annular engaging projection 68 of the diaphragm 30 (the dimension indicated by W _{3 in} FIG. 5) is the same as the width of the annular recess 84 of the clamping projection 76 (the dimension indicated by W _{4 in} FIG. 2). The dimensions are approximately the same or slightly smaller.

  As shown in FIGS. 1 and 7, in the engine mount of the present embodiment, the partition member 34 is disposed in the fluid chamber 32 inside the small diameter portion 22 of the second mounting bracket 12. Under the state, the pinching protrusion 76 is arranged so as to extend coaxially with the second mounting member 12 toward the equilibrium chamber 38 side (lower side). Further, under such an arrangement state, the outer peripheral surface of the holding protrusion 76, that is, the front end side holding surface 80 and the base side holding surface 86 are fixed to the inner peripheral surface of the small diameter portion 22 of the second mounting bracket 12. The inner seal rubber layer 28 is opposed to the inner peripheral surface. In other words, the front end side and the base side holding surfaces 80 and 86 of the holding protrusions are opposed to the inner peripheral surface of the small diameter portion 22 of the second mounting bracket 12 with the inner seal rubber layer 28 interposed therebetween. .

  Furthermore, the partition member 34 is disposed in the fluid chamber 32 as described above, and the diaphragm 30 is disposed in a state where the diaphragm 30 is disposed so as to cover the lower opening of the second mounting bracket 12. The outer peripheral wall portion 66 is fixed to the distal end side and the base side holding surfaces 80 and 86 of the holding protrusions 76 of the partitioning member 34 arranged to face each other and the inner peripheral surface of the small diameter portion 22 of the second mounting bracket 12. It is inserted and arranged between the inner peripheral surface of the inner sealing rubber layer 28. Further, under such an inserted state, the annular engagement convex portion 68 of the outer peripheral wall portion 66 of the diaphragm 30 protrudes into the annular concave portion 84 of the sandwiching projection 76 of the partition member 34, while the sandwiching projection 76. The annular engaging convex portion 78 protrudes into the annular concave portion 74 of the outer peripheral wall portion 66. Furthermore, the engagement surface 72 of the outer peripheral wall portion 66 and the engagement surface 82 of the clamping protrusion 76 engage with each other in the vertical direction (the axial direction of the second mounting bracket 12) with the former facing upward. ing.

  Then, under the arrangement state of the outer peripheral wall portion 66 of the diaphragm 30 and the clamping protrusion 76 of the partition member 34 as described above, the partition member 34 is clamped by the small diameter portion 22 of the second mounting bracket 12 as will be described later. In order to fix, the diameter of the second mounting member 12 is reduced, so that the outer peripheral wall portion 66 of the diaphragm 30 is connected to the distal end side and the base side clamping surfaces 80 and 86 of the clamping projection 76 of the partition member 34, and Between the inner peripheral surface of the small-diameter portion 22 of the second mounting bracket 12, the pressure is held and fixed via the inner sealing rubber layer 28.

  In addition, when the outer peripheral wall portion 66 of the diaphragm 30 is clamped and fixed between the clamping protrusion 76 of the partition member 34 and the second mounting member 12, the engagement surface 72 of the outer peripheral wall portion 66 is clamped. Since the engagement surfaces 82 of the projections 76 are engaged with each other in the vertical direction, the outer peripheral wall portion 66 is prevented from coming out from between the clamping projections 76 of the partition member 34 and the second mounting bracket 12. It has come to be.

  Further, when the outer peripheral wall portion 66 of the diaphragm 30 is clamped and fixed, the inner flange portion 24 integrally formed at the lower end portion of the second mounting bracket 12 is perpendicular to the axis due to the reduced diameter of the second mounting bracket 12. It is displaced inward direction. Thus, the upper surface portion on the distal end side of the inner flange portion 24 is engaged with the lower surface of the outer peripheral portion of the diaphragm 30 in the vertical direction via the inner seal rubber layer 28. This also prevents the outer peripheral wall portion 66 from slipping out from between the clamping protrusion 76 of the partition member 34 and the second mounting bracket 12.

  As described above, in the engine mount of the present embodiment, the outer peripheral wall 66 formed integrally with the outer peripheral edge of the diaphragm 30 made of a single rubber member is formed between the clamping protrusion 76 of the partition member 34 and the second protrusion. The lower opening of the second mounting member 12 is covered with the diaphragm 30 in a fluid-tight manner so that the lower opening of the second mounting member 12 is securely clamped between the mounting member 12 and the mounting member 12. It is supposed to be done.

  By the way, the engine mount of the present embodiment having the above-described structure is advantageously manufactured, for example, by performing work according to the following procedure.

  That is, first, the first mounting bracket 10 is in the state of being spaced apart from the second mounting bracket 12 in the axial direction on the opening side on the large diameter portion 20 side of the cylindrical second mounting bracket 12. The first mounting bracket 10 and the second mounting bracket 12 are connected to each other by the main rubber elastic body 14, and the opening on the large diameter portion 20 side of the second mounting bracket 12 is covered with a fluid tight cover. The intermediate molded body 88 (see FIG. 8) thus formed is prepared by performing integral vulcanization molding by known mold molding or the like.

  On the other hand, a partition member 34 having a structure as shown in FIGS. 2 to 4 and a diaphragm 30 having a structure as shown in FIGS. 5 and 6 are separately produced or molded, prepare.

  Next, as shown in FIG. 8, the intermediate molded body 88, the partition member 34, and the diaphragm 30 are immersed in an incompressible fluid 31 accommodated in a predetermined container, and the incompressible property is obtained. The intermediate molded body 88 is placed in a state where the intermediate molded body 88 is turned upside down and supported on a support base 92 disposed in advance in the fluid 31.

  Thereafter, as shown in FIG. 9, the partition member 34 is accommodated in the small-diameter portion 22 through the opening on the small-diameter portion 22 side of the second mounting member 12 in the intermediate molded body 88 supported by the support base 92. And it arrange | positions so that the inner side of the small diameter part 22 may be partitioned off to an up-down direction. At the same time, the diaphragm 30 is also accommodated in the small diameter portion 22 through the opening on the small diameter portion 22 side of the second mounting bracket 12.

  Then, when the partition member 34 and the diaphragm 30 are accommodated in the small-diameter portion 22, the partition member 34 is in a state in which the sandwiching protrusion 76 protrudes upward, and the lid of the partition member body 40. The outer peripheral portion of the surface on the body 42 side is overlapped and positioned so as to be placed on the end surface on the large diameter side of the main rubber elastic body 14 (the end surface opposite to the fixing side of the first mounting bracket 10). . Further, the outer peripheral wall portion 66 of the diaphragm 30 is externally fitted to the sandwiching protrusion 76 of the partition member 34. Further, under such an external fitting state, the annular engagement convex portion 68 of the outer peripheral wall portion 66 is placed in the annular concave portion 84 of the sandwiching projection 76, and the annular engagement convex portion 78 of the sandwiching projection 76 is placed on the outer peripheral wall. Each of the engaging portions 72 of the outer peripheral wall portion 66 and the engaging surface 82 of the holding projection 76 are engaged with each other in the vertical direction.

  Thus, the partition member 34 and the diaphragm 30 are assembled together in the small diameter portion 22 of the second mounting bracket 12. At the same time, the outer peripheral wall portion 66 of the diaphragm 30 is connected to the distal and base side clamping surfaces 80 and 86 formed of the outer peripheral surface of the clamping projection 76 of the partition member 34, and the small diameter portion 22 of the second mounting bracket 12. The diaphragm 30 is disposed between the inner peripheral surface and the inner peripheral surface of the inner seal rubber layer 28 so that the opening on the small diameter portion 22 side of the second mounting bracket 12 is covered with the diaphragm 30. .

  As described above, the outer peripheral wall portion 66 of the partition member 34 has a guide surface 70 in which the tip end surface of the annular engagement convex portion 68 is a tapered surface, and the outer peripheral edge portion of the diaphragm 30 is By forming the outer peripheral wall portion 66, the outer peripheral wall portion 66 is harder than other portions. For this reason, the front end side clamping surface 80 of the annular engagement convex portion 78 of the clamping projection 76 is slid on the guide surface 70 of the annular engagement convex portion 68 of the outer peripheral wall portion 66, and the clamping projection 76 is moved to the outer peripheral wall portion. The operation of fitting the outer peripheral wall portion 66 to the pinching protrusion 76 and the operation of engaging the respective engaging surfaces 72 and 82 of the outer peripheral wall portion 66 and the pinching protrusion 76 simply by pushing into the pin 66. It is very easy and smooth to implement.

  In this step, the partition member 34 and the diaphragm 30 are assembled with each other within the small diameter portion 22 of the second mounting member 12 in a state where the partition member 34 and the diaphragm 30 are immersed in the incompressible fluid 31. And the diaphragm 30 may be assembled to each other outside the second mounting bracket 12 in a state of being immersed in the incompressible fluid 31, or may be assembled to each other before being immersed in the incompressible fluid 31. Also good.

  Next, as shown in FIG. 10, diameter reduction processing such as eight-way drawing is performed on the second mounting bracket 12 using a known drawing die 94. Thereby, the partition member 34 is clamped and fixed on the inner peripheral surface of the small diameter portion 22 of the second mounting bracket 12. At the same time, the outer peripheral wall portion 66 of the diaphragm 30 is connected to the front end side and base side holding surfaces 80 and 86 of the holding projection 76 of the partition member 34 and the inner peripheral surface of the small diameter portion 22 of the second mounting bracket 12. In between, it clamps and fixes via the inner side seal rubber layer 28.

  Thus, a target engine mount is obtained in which the pressure receiving chamber 36 and the equilibrium chamber 38 are formed in communication with each other through the orifice passage 64 on both sides with the partition member 34 interposed therebetween.

  As described above, in the engine mount of the present embodiment, although the diaphragm 30 is formed of a single rubber member, the outer side integrally provided on the outer peripheral edge of the diaphragm 30 is provided. The peripheral wall portion 66 is clamped and fixed between the clamping protrusion 76 of the partition member 34 and the small diameter portion 22 of the second mounting bracket 12, so that the opening on the small diameter portion 22 side of the second mounting bracket 12 is formed. The diaphragm 30 is securely covered with a fluid tightly, and a pressure receiving chamber 36 and an equilibrium chamber 38 are formed on both sides of the partition member 34 therebetween.

  Therefore, in such an engine mount, unlike the conventional apparatus, the necessity of vulcanizing and bonding the support fitting to the diaphragm 30 is eliminated, whereby the number of parts can be advantageously reduced and the diaphragm 30 can be reduced. The step for vulcanizing and bonding the support metal fitting can also be effectively omitted. Further, the outer peripheral wall portion 66 of the diaphragm 30 is formed by reducing the diameter of the second mounting bracket 12 which is performed to clamp and fix the partition member 34 to the inner peripheral surface of the second mounting bracket 12. There is no need to carry out a special operation only for attaching the diaphragm 30 to the second mounting bracket 12 from where it is clamped and fixed between the clamping projection 76 and the small diameter portion 22 of the second mounting bracket 12. The effort and cost for performing such an operation can be advantageously saved.

  Furthermore, in the engine mount of the present embodiment, the diaphragm (30) made of a single rubber member is clamped and fixed between the partition member (34) and a bottom bracket or the like separate from the second mounting bracket 12. Unlike the conventional apparatus, the outer peripheral wall portion 66 of the diaphragm 30 made of a single rubber member is sandwiched and fixed between the partition member 34 and the second mounting bracket 12. Therefore, the diaphragm 30 can be securely attached without using an extra member such as a bottom metal fitting. This can also advantageously reduce the number of parts.

  When using the bottom bracket, the diaphragm (30) is fixed between the bottom bracket and the second mounting bracket work (12) by caulking and fixing the bottom bracket to the second mounting bracket (12). However, in the engine mount of this embodiment, the caulking fixing operation is performed in order to clamp and fix the outer peripheral wall portion 66 of the diaphragm 30 between the partition member 34 and the second mounting bracket 12. Instead, as described above, it is only necessary to carry out the diameter reduction processing of the second mounting bracket 12 for clamping and fixing the partition member 34 to the inner peripheral surface of the second mounting bracket 12. Also by this, the effort and cost required for the operation for fixing the diaphragm 30 can be advantageously reduced.

  Moreover, in the engine mount of the present embodiment, since the bottom bracket is not caulked and fixed to the second mounting bracket 12, a shoulder projecting in the direction perpendicular to the axis with respect to the second mounting bracket 12 in order to perform caulking fixing. There is no need to form parts. Therefore, it can be effectively avoided that the second mounting member 12, and thus the entire engine mount, is enlarged due to the formation of the shoulder portion.

  Therefore, in the engine mount of the present embodiment as described above, the diaphragm 30 can be obtained by performing the efficient process at a sufficiently low cost without causing an increase in the size of the entire engine mount. And the second mounting bracket 12 can be fixed. As a result, a reduction in manufacturing cost and an improvement in manufacturability can be realized extremely effectively.

  Further, in the engine mount of the present embodiment, the outer peripheral wall portion 66 is erected integrally with the outer peripheral edge portion of the upper surface of the diaphragm 30, so that the outer peripheral portion of the diaphragm 30 is harder than other portions. Further, such an outer peripheral wall portion 66 is sandwiched and fixed between the sandwiching protrusion 76 of the partition member 34 and the small diameter portion 22 of the second mounting bracket 12. Therefore, for example, the outer peripheral portion of the diaphragm 30 having no outer peripheral wall portion 66 is made to have the same hardness as that of the central portion between the clamping protrusion 76 of the partition member 34 and the small diameter portion 22 of the second mounting bracket 12. Compared to the case of sandwiching and fixing between, a part (outer peripheral wall portion 66) of the diaphragm 30 is disposed between the sandwiching projection 76 of the partition member 34 and the small diameter portion 22 of the second mounting bracket 12. The work can be performed more easily and smoothly.

  Moreover, in such an engine mount, since the outer peripheral part of the diaphragm 30 is hardened by forming the outer peripheral wall part 66, for example, the settling of the outer peripheral part of the diaphragm 30 due to long-term use or the like can be effectively suppressed. Therefore, due to such settling, the elastic deformation amount of the diaphragm 30 and the shape of the diaphragm 30 after elastic deformation change compared to the beginning of use, and accordingly, the vibration-proof characteristics change. This can also be effectively prevented.

  Further, in the engine mount of the present embodiment, the annular engagement formed integrally with the engagement surface 72 of the annular engagement convex portion 68 formed integrally with the outer peripheral wall portion 66 of the diaphragm 30 and the clamping protrusion 76 of the partition member 34. The engagement of the projection 78 with the engagement surface 82 in the vertical direction prevents the outer peripheral wall 66 from coming off from between the clamping projection 76 and the second mounting bracket 12. Further, when the inner flange portion 24 formed integrally with the end portion on the small diameter portion 22 side of the second mounting bracket 12 is engaged with the outer peripheral portion of the diaphragm 30, the sandwiching protrusion 76 and the second mounting bracket 12 are also engaged. The outer peripheral wall portion 66 is prevented from slipping out from between the two. Therefore, in such an engine mount, desired vibration isolation characteristics can be stably ensured over a longer period of time.

  Furthermore, in the engine mount of the present embodiment, the outer peripheral wall portion 66 of the diaphragm 30 is interposed between the clamping protrusion 76 of the partition member 34 and the second mounting bracket 12 via the inner seal rubber layer 28. It is pinched and fixed. That is, the outer peripheral wall portion 66 and the inner seal rubber layer 28 of the diaphragm 30 are closely arranged between the clamping protrusion 76 of the partition member 34 and the second mounting member 12. Thereby, the sealing performance between the partition member 34 and the second mounting bracket 12 can be more effectively ensured.

  Next, FIGS. 11 and 12 show an automobile engine mount as another embodiment of a fluid filled type vibration damping device having a structure according to the present invention. The engine mount for automobiles of the present embodiment (hereinafter simply referred to as “engine mount”) mainly differs in the structure of the diaphragm from the engine mount according to the first embodiment. Therefore, regarding such an engine mount of this embodiment, the same reference numerals as those in FIG. 1 are given in FIGS. 11 and 12 for members and portions having the same structure as the engine mount according to the first embodiment. Thus, detailed description thereof will be omitted.

  That is, as apparent from FIGS. 11 and 12, in the engine mount of the present embodiment, the outer peripheral wall portion 66 is erected integrally with the outer peripheral edge portion of the upper surface of the diaphragm 30. The outer peripheral wall portion 66 has the same structure as the outer peripheral wall portion 66 provided integrally with the outer peripheral edge portion of the diaphragm 30 of the engine mount according to the first embodiment.

  Further, in the diaphragm 30, the inner peripheral wall portion 96 is integrally erected on a portion located on the center side of the outer peripheral portion of the upper surface with respect to the formation portion of the outer peripheral wall portion 66. The inner peripheral wall portion 96 has an annular or lower cylindrical shape having a height lower than the outer peripheral wall portion 66 by a predetermined dimension and a thickness substantially the same as the thickness of the outer peripheral wall portion 66. In the outer peripheral portion of the upper surface of the diaphragm 30, the annular engagement convex portion 78 of the clamping protrusion 76 of the partition member 34 is formed with respect to the inner peripheral surface portion (the bottom surface of the annular concave portion 74) on the base side of the outer peripheral wall portion 66. Opposite positions are arranged so as to extend vertically upward at positions separated by substantially the same distance as the thickness of the tip portion to be formed. In other words, the inner peripheral wall portion 96 is spaced from the outer peripheral wall of the upper surface of the diaphragm toward the center side at an interval of the same dimension as the thickness of the tip of the outer peripheral wall portion clamping protrusion 76. It is erected so as to extend coaxially with the portion 66.

  In this way, the outer peripheral wall portion 66 and the inner peripheral wall portion 96 are erected so as to extend coaxially at a predetermined interval from each other on the outer peripheral edge portion of the upper surface of the diaphragm 30 and the central portion side thereof. As a result, the outer peripheral portion of the diaphragm 30 is hardened more advantageously than the central portion. Further, the inner peripheral surface of the outer peripheral wall portion 66 and the outer peripheral surface of the inner peripheral wall portion 96 are side surfaces on both sides between the outer peripheral wall portion 66 and the inner peripheral wall portion 96 with respect to the outer peripheral portion of the upper surface of the diaphragm 30. A concave groove 98 is provided around.

  In the concave groove 98, the distance between both side surfaces formed by the inner peripheral surface of the outer peripheral wall portion 66 and the outer peripheral surface of the inner peripheral wall portion 96 is substantially the same as the thickness of the tip end portion of the holding projection 76. In addition, one side surface formed by the inner peripheral surface of the outer peripheral wall portion 66 has the same shape as the outer peripheral surface (the front end side and base side holding surfaces 80 and 86) of the holding protrusion 76, and the inner peripheral wall portion. The other side surface of the outer peripheral surface of 96 has the same shape as the inner peripheral surface of the tip portion of the holding projection 76. As a result, the pinching protrusion 76 can be inserted into the concave groove 98.

  In the engine mount according to the present embodiment, the partition member 34 is used for clamping the partition member 34 in a state where the partition member 34 is clamped and fixed on the inner peripheral surface of the small-diameter portion 22 of the second mounting bracket 12 having a reduced diameter. The protrusion 76 is fitted in the concave groove 98 of the diaphragm 30. In such a state, the outer peripheral wall portion 66 constituting one side wall portion of the concave groove 98 is connected to the distal end side and base portion side holding surfaces 80 and 86 (outer peripheral surface) of the holding projection 76 and the second mounting bracket 12. The inner peripheral wall 96 is held and fixed between the inner peripheral surface of the small-diameter portion 22 via the inner seal rubber layer 28, while the inner peripheral wall 96 is disposed on the outer peripheral surface of the holding projection 76. Close to the surface.

  Thus, even in the engine mount of this embodiment, the outer peripheral wall portion 66 of the diaphragm 30 is clamped and fixed between the clamping projection 76 of the partition member 34 and the small diameter portion 22 of the second mounting bracket 12. As a result, the same functions and effects as those exhibited in the engine mount according to the first embodiment can be enjoyed effectively.

  In the present embodiment, in particular, the outer peripheral wall portion 66 and the inner peripheral wall portion 96 are erected so as to extend coaxially to the outer peripheral portion of the upper surface of the diaphragm 30, and the outer peripheral portion of the diaphragm 30 is thereby Also hardened more effectively than the central part. Therefore, the operation of inserting the clamping protrusion 76 into the concave groove 98 of the diaphragm 30 is facilitated, and the operation of assembling the partition member 34 and the diaphragm 30 as described above, or non-compression It is even easier to arrange the outer peripheral wall portion 66 of the diaphragm 30 so as to be inserted between the holding projection 76 of the partition member 34 and the small-diameter portion 22 of the second mounting member 12 in the magnetic fluid 31. And can be carried out smoothly. And as a result, the improvement of the manufacturability of the engine mount can be further effectively enhanced.

  Further, since the outer peripheral portion of the diaphragm 30 is sufficiently harder than the center side portion thereof, the amount of elastic deformation and elasticity of the diaphragm 30 due to the settling of the outer peripheral portion of the diaphragm 30 due to long-term use or the like, for example. It can be more effectively prevented that the shape and the like of the diaphragm 30 after the deformation changes compared to the beginning of use, and the vibration isolation characteristics change accordingly.

  As mentioned above, although embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description regarding this embodiment.

  For example, if the clamping protrusion 76 is integrally formed so as to extend coaxially with the second mounting member 12 with respect to the surface of the partition member 34 on the side of the equilibrium chamber 38 (secondary liquid chamber), the shape or the like thereof However, it is not particularly limited. Accordingly, the annular engagement convex portion 78 and the like may be omitted, and the shape of the outer peripheral surface of the holding projection 76 may be a cylindrical surface shape or a tapered surface shape.

  Further, the sandwiching protrusion 76 does not necessarily have to be erected with the partition member main body 40 of the partition member 34 by being integrally formed. For example, it is possible to form the clamping protrusion 76 separately from the partition member 34, and to fix or clamp the clamping protrusion 76 to the surface of the partition member 34 on the side of the equilibrium chamber 38. .

  Further, for example, without forming any outer peripheral wall portion 66 on the outer peripheral portion of the diaphragm 30, the outer peripheral portion of the diaphragm 30 is placed between the clamping protrusion 76 of the partition member 34 and the second mounting bracket 12. It may be clamped and fixed via the seal rubber layer 28 or without it.

  Even when the outer peripheral wall portion 66 is formed on the outer peripheral portion of the diaphragm 30, the shape of the outer peripheral wall portion 66 is not particularly limited. The outer peripheral wall portion 66 can be appropriately changed in its inner peripheral surface shape, for example, corresponding to the outer peripheral surface shape of the clamping protrusion 76 of the partition member 34.

  Further, as the structure of the partition member 34, a conventionally known structure can be appropriately adopted. The movable plate 62 can be omitted from the partition member 34.

  In addition, a specific example of applying the present invention to an engine mount of an automobile has been shown.However, the present invention is also applied to a fluid-filled vibration isolator used in various apparatuses other than an automobile body mount and an automobile. Of course, either can be applied advantageously.

  In addition, although not enumerated one by one, the present invention can be carried out in an embodiment to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 1st mounting bracket 12 2nd mounting bracket 14 Main body rubber elastic body 24 Inner flange part 28 Inner seal rubber layer 30 Diaphragm 32 Fluid chamber 34 Partition member 36 Pressure receiving chamber 38 Equilibrium chamber 64 Orifice passage 66 Outer peripheral wall 68, 78 Annular Engagement projections 70, 82 Engagement surface 76 Protrusion for clamping 88 Intermediate molded body 96 Inner peripheral wall portion 98 Concave groove

Claims (7)

The first mounting member is disposed on one axial side of the second mounting member having a cylindrical shape and spaced apart from the second mounting member in the axial direction. The second mounting member is connected to the main rubber elastic body to cover one opening in the axial direction of the second mounting member in a fluid-tight manner, while the other opening in the axial direction of the second mounting member is covered. By covering fluid tightly with a flexible membrane, a fluid chamber in which an incompressible fluid is sealed is formed between the main rubber elastic body and the flexible membrane, and a partition is formed inside the fluid chamber. A member is accommodated and the fluid chamber is partitioned on both sides in the axial direction of the second mounting member, whereby a main liquid chamber in which a part of the wall portion is constituted by a main rubber elastic body, and a wall portion. And a secondary liquid chamber having a flexible film formed on both sides of the partition member, and the main liquid chamber and the secondary liquid chamber are mutually connected. In the fluid filled type vibration damping device comprising an orifice passage for passing the partition member,
An annular or cylindrical clamping protrusion is provided so as to extend coaxially with the second mounting member with respect to the surface of the partition member on the side of the secondary liquid chamber, and the flexible membrane The fluid sealing is characterized in that the outer peripheral portion of the second mounting member is sandwiched and fixed by the reduced diameter of the second mounting member between the outer peripheral surface of the clamping projection and the inner peripheral surface of the second mounting member. Type vibration isolator.   An annular or cylindrical outer peripheral wall portion is erected integrally with an outer peripheral portion of the surface of the flexible film on the side of the secondary liquid chamber, and the outer peripheral wall portion is an outer periphery of the holding protrusion. The fluid-filled vibration isolator according to claim 1, wherein the fluid-filled vibration isolator is sandwiched and fixed between a surface and the inner peripheral surface of the second mounting member.   While the first engaging portion is provided on the outer peripheral surface of the clamping protrusion, the outer peripheral wall portion of the flexible film is sandwiched and fixed between the clamping projection and the second mounting member. Thus, the outer peripheral wall portion is prevented from coming off between the holding projection and the second mounting member by engaging with the first engaging portion in the axial direction of the second mounting member. The fluid-filled vibration isolator according to claim 2, wherein a second engaging portion that forms the outer peripheral wall portion is provided on the inner peripheral surface of the outer peripheral wall portion.   An annular or cylindrical inner peripheral wall extending coaxially with an interval from the outer peripheral wall portion at an inner portion of the outer peripheral portion of the surface on the side of the secondary liquid chamber in the flexible membrane. The above-mentioned sandwiching portion is integrally provided and has an inner peripheral surface of the outer peripheral wall portion and an outer peripheral surface of the inner peripheral wall portion on both sides between the outer peripheral wall portion and the inner peripheral wall portion. The fluid-filled vibration isolator according to claim 2 or 3, wherein a concave groove into which the protrusion is inserted is formed.   A seal rubber layer is provided on an inner peripheral surface portion of the second mounting member that clamps and fixes the outer peripheral portion of the flexible film between the outer peripheral surface of the holding protrusion and the outer peripheral portion of the flexible film. 5 is sandwiched and fixed between the outer peripheral surface of the clamping protrusion and the inner peripheral surface of the second mounting member through the seal rubber layer. The fluid-filled vibration isolator described in 1. An inner flange portion is integrally provided at an end of the second mounting member on the other axial side opening side, and between the clamping protrusion and the second mounting member. Under the state in which the outer peripheral portion of the flexible membrane is clamped and fixed, the second flange is attached to the surface of the outer peripheral portion of the flexible membrane opposite to the sub liquid chamber side. engages in the axial direction of the member, the clamping projection and said second of said flexible membrane outer peripheral portion of the missing claims 1 to which is adapted to be blocked in from between the mounting member Item 6. The fluid-filled vibration isolator according to any one of Items 5 to 5.
The first mounting member is disposed on one axial side of the second mounting member having a cylindrical shape and spaced apart from the second mounting member in the axial direction. The second mounting member is connected to the main rubber elastic body to cover one opening in the axial direction of the second mounting member in a fluid-tight manner, while the other opening in the axial direction of the second mounting member is covered. By covering fluid tightly with a flexible membrane, a fluid chamber in which an incompressible fluid is sealed is formed between the main rubber elastic body and the flexible membrane, and a partition is formed inside the fluid chamber. A member is accommodated and the fluid chamber is partitioned on both sides in the axial direction of the second mounting member, whereby a main liquid chamber in which a part of the wall portion is constituted by a main rubber elastic body, and a wall portion. And a secondary liquid chamber having a flexible film formed on both sides of the partition member, and the main liquid chamber and the secondary liquid chamber are mutually connected. A method of manufacturing a fluid-filled vibration damping device comprising an orifice passage for passing the partition member,
The first mounting member and the first mounting member are arranged in a state of being spaced apart from the second mounting member in the axial direction on one opening side of the second mounting member in the axial direction. A step of preparing an intermediate molded body in which one opening in the axial direction of the second mounting member is fluid-tightly covered by connecting the second mounting member with the main rubber elastic body;
Preparing a partition member having an annular or cylindrical clamping projection extending coaxially with the second mounting member with respect to one surface in the thickness direction; ,
The intermediate molded body, the partition member, and the flexible membrane are immersed in a predetermined incompressible fluid, while the partition member is disposed on the inner side of the second mounting member. With the other surface in the thickness direction facing the other opening side in the axial direction, the inner side of the second mounting member is accommodated and arranged so as to be divided on both sides in the axial direction, and the outer periphery of the flexible membrane Is inserted between the outer peripheral surface of the clamping protrusion of the partition member and the inner peripheral surface of the second mounting member, and the other opening in the axial direction of the second mounting member is A step of covering with a flexible film;
In the incompressible fluid, the partition member is accommodated and arranged on the inner side, and the second attachment member covered with the other opening in the axial direction is covered with the flexible film in the incompressible fluid. The partition member is clamped and fixed on the inner peripheral surface of the second mounting member, and the outer peripheral portion of the flexible film is connected to the outer peripheral surface of the clamping projection and the inner peripheral surface of the second mounting member. Forming the main liquid chamber and the sub liquid chamber on both sides of the partition member in a state where they are communicated with each other through the orifice passage of the partition member. When,
The manufacturing method of the fluid enclosure type vibration isolator characterized by including.

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