JP4833188B2 - Fluid-filled vibration isolator and manufacturing method thereof - Google Patents

Description

  The present invention relates to a fluid-filled vibration isolator that obtains a vibration-proof effect based on the flow action of an incompressible fluid sealed in an internal fluid chamber, and in particular, a lid is provided at the opening of a second mounting member. The present invention relates to a fluid-filled vibration isolator in which a fluid chamber is formed by fitting and fixing a member and closing an opening, and a manufacturing method thereof.

  Conventionally, as a type of vibration isolator such as an anti-vibration coupling body and an anti-vibration support body interposed between members constituting a vibration transmission system, an anti-vibration effect is obtained based on the flow action of an incompressible fluid. There has been known a fluid-filled vibration isolator. In this fluid-filled vibration isolator, for example, the first mounting member is spaced from one opening side of the cylindrical second mounting member, and the first mounting member and the second mounting member are the main body. By being connected by the rubber elastic body, one opening of the second mounting member is closed. Further, the lid member is inserted from the other opening side of the second mounting member, and the lid member is fitted and fixed to the other opening of the second mounting member by the reduced diameter of the second mounting member. By closing the other opening, a fluid chamber in which an incompressible fluid is sealed is formed. Such a fluid-filled vibration isolator has been studied for application to, for example, an automobile engine mount, body mount, and differential mount as well as a suspension member mount.

  Incidentally, in the fluid-filled vibration isolator as described above, one of the problems for stably obtaining the target vibration isolating effect is improvement of the sealing performance of the fluid chamber. That is, high fluid tightness is required in the portion where the other opening of the second mounting member is covered with the lid member.

  Therefore, in order to meet such a requirement, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2007-205437), the diameter of the peripheral wall on the other opening side of the second mounting member is reduced toward the outside in the axial direction. The tapered cylindrical caulking portion is formed, and the tapered mounting caulking portion is attached to the inner surface of the second mounting member by caulking in accordance with the diameter reduction of the second mounting member. A structure in which the cover member is superposed on the lid member in the direction perpendicular to the axis via a sealing rubber layer is disclosed.

  However, in such a fluid-filled vibration isolator having a tapered caulking structure, the lid member can be stably positioned at the fitting fixing position of the second mounting member, or the opening of the second mounting member in the lid member In order to prevent slipping out of the taper, a certain amount of axial length is required for the caulking portion having a tapered cylindrical shape. Therefore, for example, when the axial length of the second mounting member is suppressed from the viewpoint of space saving or the like, it is difficult to secure the axial length of the caulking portion sufficiently, and the second of the lid member There is a possibility that it is difficult to secure a sufficient positioning force and pull-out resistance against the mounting member.

  For the purpose of dealing with this problem, for example, as shown in Patent Document 2 (Japanese Patent Laid-Open No. 10-252807), the lid member is pivoted more than the other opening end of the second mounting member. A fitting portion that extends inward in the direction perpendicular to the axis is integrated with the opening end portion that extends outward in the axial direction from the fitting fixing region of the lid member in the second mounting member. It is conceivable that the engaging portion is overlapped with the lid member in the axial direction through the seal rubber layer as the diameter of the second mounting member is reduced. This prevents the second mounting member in the lid member from coming off from the opening.

  However, when forming the inner flange-shaped locking portion at the opening end of the second mounting member as described above, for example, a cylindrical body is formed by drawing a plurality of times using a steel plate for press working. In addition to this, it has been necessary to perform a hole punching process on the bottom of the bottomed cylindrical body or to perform a roll caulking process on the peripheral wall portion on the opening side of the cylindrical body having the opening. As a result, there are problems that the number of processing steps increases and the structure of the processing machine becomes complicated, which makes manufacture difficult.

JP 2007-205437 A JP-A-10-252807

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the sealing performance of the portion where the opening of the second mounting member is covered with the lid member. An object of the present invention is to provide a fluid-filled vibration isolator having a novel structure that can be improved with a simple structure and a novel method for manufacturing such a fluid-filled vibration isolator.

  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. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  That is, the feature of the present invention is that the first mounting member is spaced from one opening side of the cylindrical second mounting member, and the first mounting member and the second mounting member are By being connected by the main rubber elastic body, one opening of the second mounting member is closed, and a lid member is inserted from the other opening side of the second mounting member to A fluid in which an incompressible fluid is sealed inside by the lid member being fitted and fixed to the other opening of the second mounting member by the reduced diameter and the other opening of the second mounting member being closed. In the fluid-filled vibration isolator having a chamber, an annular constriction constricted inward is formed in one opening of the second mounting member, while the other of the second mounting member An inward protruding portion that protrudes toward the inner peripheral side is at least on the periphery of the peripheral wall portion on the opening side of the In addition, a seal rubber layer is formed on the inner peripheral surface of the second mounting member, and a seal rubber layer is formed on the fitting portion of the lid member including the portion where the inner protrusion is formed. The second mounting member is positioned inward in the axial direction of the second mounting member relative to the protrusions, and the second mounting member is reduced in diameter so that the axially inner side surfaces of these inward protrusions are covered with a seal rubber layer. The fluid-filled vibration isolator is in contact with the axially outer end of the member.

  In such a fluid-filled vibration isolator having a structure according to the present invention, the inward protrusion is brought into contact with the lid member via the seal rubber layer, so that the lid member is attached to the shaft of the second mounting member. A pressing force that presses inward in the direction is applied. Thereby, positioning of the lid member in the second mounting member in the axial direction and prevention of slipping out are effectively achieved.

  In addition, since at least two inward protrusions are formed in the circumferential direction of the second mounting member, the effect of preventing the lid member from coming off by the pressing action of the inward protrusion can be effectively exhibited. In addition, it is realized by a simple manufacturing process as compared with the case of forming the inward protrusion that continuously extends in the circumferential direction.

  Therefore, the portion covered with the lid member in the other opening of the second mounting member can be realized with a simple structure and high fluid tightness due to the seal rubber layer.

  Further, in the fluid filled type vibration damping device according to the present invention, the axially inward of the inward protrusion of the second mounting member that is in contact with the axially outer end of the lid member via the seal rubber layer. A structure in which the side surface is an inclined surface inclined inward in the axial direction with respect to the axis-perpendicular direction line in the second mounting member may be employed. According to such a structure, since the axially inner side surface of the inward protrusion is an inclined surface, the axial force of the lid member in the second mounting member is generated by the component force corresponding to the inclination angle. The positioning force can be exerted more efficiently.

  In the fluid-filled vibration isolator according to the present invention, a structure in which the inward protrusions of the second mounting member are formed at equal intervals on the circumference of the second mounting member may be employed. . According to such a structure, the escape of the lid member from the opening of the second mounting member can be efficiently suppressed over the entire circumference. Moreover, as a result of reducing the local stress concentration in the portion where the plurality of inward protrusions are formed on the circumference of the second mounting member, the durability of the second mounting member can be improved.

  In the fluid filled type vibration damping device according to the present invention, the lid member may have a structure in which an annular fitting is vulcanized and bonded to the outer peripheral edge of the rubber film. As a result, the fitting is inserted from the other opening side of the second mounting member and is fixed by fitting, so that a part of the wall portion is formed of the rubber film and based on the elastic deformation of the rubber film. A fluid chamber capable of allowing a volume change is formed. Also in the fluid filled type vibration damping device having such a fluid chamber, the axially inner side surface of the inward protrusion is brought into contact with the axially outer end of the fitting through the seal rubber layer. The axial positioning force and the slip-out preventing force of the fitting fitting in the second mounting member are improved. Therefore, the fluid tightness of the fluid chamber can be improved and the rubber film is stably assembled to the other opening side of the second mounting member.

  Further, in the fluid filled type vibration damping device according to the present invention, the second mounting member has a cross-sectional shape in which the inward protrusion is recessed inward, and is axially outward from the inward protrusion. A structure in which the second mounting member has an end cylindrical portion that further extends in a cylindrical shape may be employed. By providing the end cylindrical portion on the second mounting member, the strength of the inner projection is improved, and when the second mounting member is deformed, the inner projection is extended. In addition to suppressing irregular deformation of the second mounting member, the force by which the inward projection presses the lid member inward in the axial direction of the second mounting member via the seal rubber layer can be obtained more stably. It is done. In addition, for example, it is possible to set a biting portion of the molding die of the seal rubber layer on the inner peripheral surface of the end cylindrical portion, and thereby, it is formed on the inner peripheral surface of the second mounting member. The sealing rubber layer can be easily molded.

  Further, the present invention is characterized in that (a) the first mounting member is spaced apart from one opening side of the cylindrical second mounting member, while one opening of the second mounting member And an annular constriction portion constricted inwardly, and at least two inward projections projecting inwardly on the peripheral wall portion on the other opening side of the second mounting member on the circumference. The first mounting member and the second mounting member are connected by a main rubber elastic body to close one opening of the second mounting member, and the second mounting member projects inwardly. A step of preparing an integral vulcanization molded product of the main rubber elastic body provided with the first mounting member and the second mounting member by depositing and forming a seal rubber layer on the inner peripheral surface including the portion forming portion; (B) A lid member having an outer diameter smaller than the inner diameter of the other opening of the second mounting member And (c) inserting a lid member from the other opening side of the second mounting member in the integrally vulcanized molded product of the main rubber elastic body in an incompressible fluid, and projecting the lid member inwardly A step of defining a fluid chamber filled with an incompressible fluid by positioning the second mounting member inward in the axial direction of the second mounting member, and (d) a diameter-reducing deformation of the second mounting member. The inner protrusion is brought into contact with the axially outer end of the lid member via the seal rubber layer, so that the lid member is fitted and fixed to the other opening of the second mounting member. And a step of closing the other opening of the mounting member.

  According to such a method for manufacturing a fluid-filled vibration isolator according to the present invention, the fluid chamber is filled with the incompressible fluid, and the inward projecting portion is connected to the lid member via the seal rubber layer. The structure in which the fluid chamber is fluid-tightly sealed by pressing inward in the axial direction is realized with a small number of steps. Therefore, it is possible to realize a fluid-filled vibration isolator that exhibits high fluid tightness in the fluid chamber with excellent manufacturing efficiency and cost performance.

  Further, in the method for manufacturing a fluid-filled vibration isolator according to the present invention, in the step of preparing an integrally vulcanized molded product of the main rubber elastic body, the inner peripheral surface of the seal rubber layer is fitted from the inner protrusion to the cover member. A method of forming a cylindrical inner peripheral surface having a constant inner diameter dimension over the entire wearing region may be employed. According to such a method, the structure of the molding die of the main rubber elastic body that is vulcanized and molded together with the seal rubber layer is simplified, and the cost can be further reduced. In addition, since the area of the portion where the seal rubber layer and the second mounting member are overlapped increases using the inner peripheral surface of the inward protrusion, the seal rubber layer is more stably fixed to the second mounting member. Is done.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, FIGS. 1 and 2 show an automobile engine mount 10 as a first embodiment according to a fluid-filled vibration isolator of the present invention. In the automobile engine mount 10, a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member are elastically connected by a main rubber elastic body 16. The first mounting bracket 12 is mounted on the power unit side and the second mounting bracket 14 is mounted on the vehicle body side, so that the power unit is supported in an anti-vibration manner with respect to the vehicle body.

  1 shows the state of the engine mount 10 as a single unit before being mounted on the automobile, but in the present embodiment, in the mounted state, the shared support load of the power unit is in the mount axis direction (in FIG. 1, (Up and down). Therefore, in the mounted state, the first mounting member 12 and the second mounting member 14 are displaced in the axial direction toward each other based on the elastic deformation of the main rubber elastic body 16. In addition, under such a mounted state, main vibrations to be vibrated are input substantially in the mount axis direction.

  More specifically, the first mounting member 12 has a substantially cylindrical shape with a small diameter or an inverted truncated cone shape, and is provided with a screw hole 18 that opens to the upper end surface. The first mounting bracket 12 is screwed and fixed to a power unit side mounting member (not shown) through a screw hole 18.

  On the other hand, the second mounting bracket 14 has a large-diameter, generally cylindrical shape, and is formed using a metal material such as an aluminum alloy, iron, or steel. In addition, an annular constricted portion 20 constricted inward is formed at one opening (upper in FIG. 1) of the second mounting bracket 14. In the axial cross section of the annular constricted portion 20, one side in the axial direction sandwiching the apex projecting inward has a tapered cylindrical shape with a diameter gradually increasing outward in the axial direction. The other side in the axial direction across the apex has a flat plate shape extending in a direction substantially perpendicular to the axis, and this axial cross section extends continuously over the entire circumference. The second mounting bracket 14 is fixed to a mounting member on the vehicle body side via a bracket member (not shown).

  The first mounting bracket 12 is spaced apart from the opening of the second mounting bracket 14 having the annular constricted portion 20 so that the central axes of both the brackets 12 and 14 are positioned substantially on the same line. A main rubber elastic body 16 is disposed between the first mounting bracket 12 and the second mounting bracket 14.

  The main rubber elastic body 16 has a substantially frustoconical shape, and a large-diameter recess 22 having an inverted mortar shape or a hemispherical shape opening downward is provided on the end surface on the large-diameter side. The small-diameter side end face of the main rubber elastic body 16 is vulcanized and bonded in a state where substantially the entire portion from the axially intermediate portion to the lower end portion of the first mounting member 12 is embedded. On the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body 16, the inner peripheral surface on the tapered tubular portion side is sandwiched by the protruding front end surface in the direction perpendicular to the axis of the annular constricted portion 20 of the second mounting bracket 14. It is vulcanized and bonded over almost the whole. Further, a thin seal rubber layer 24 integrally formed with the main rubber elastic body 16 has a substantially constant thickness dimension, and sandwiches the protruding tip end surface of the annular constricted portion 20 of the second mounting bracket 14 so as to be on the flat plate portion side. The inner peripheral surface of the inner surface of the other opening and the vicinity of the other opening end are deposited over substantially the entire inner peripheral surface. That is, as shown in FIG. 3, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting bracket 12 and the second mounting bracket 14. The first mounting bracket 12 and the second mounting bracket 14 are elastically connected to each other by a main rubber elastic body 16, and one opening of the second mounting metal 14 is formed by the main rubber elastic body 16. It is closed fluid tightly.

  A partition member 26 is disposed inside the second mounting bracket 14. The partition member 26 has a substantially circular block shape and is formed of a hard member made of a metal material or a synthetic resin material. Further, a middle portion of the partition member 26 in the thickness direction (upper and lower in FIG. 1) has a predetermined length in the circumferential direction (one round in the present embodiment) with a cross section recessed inward from the outer peripheral surface in the direction perpendicular to the axis. A circumferential groove 28 is formed to extend at a low level. At both ends of the circumferential groove 28, notched communication windows 30 and 32 are formed on one end surface (upper in FIG. 1) and the other end surface (lower in FIG. 1) of the partition member 26. Has been

  Further, a lid member 34 is provided in the opening on the opposite side of the second mounting bracket 14 from the main rubber elastic body 16. The lid member 34 according to the present embodiment includes a diaphragm 36 as a rubber film and a fitting 38. The diaphragm 36 is made of a thin rubber film that can be easily deformed, and has a substantially disk shape that is slackened in the axial direction. A large-diameter cylindrical fitting 38 is disposed so as to surround the outer peripheral side of the diaphragm 36, and the outer peripheral surface including the outer peripheral edge of the diaphragm 36 is vulcanized and bonded to the inner peripheral surface of the fitting 38. Yes.

  The partition member 26 and the lid member 34 are sequentially inserted in the axially inward direction from the other opening of the second mounting bracket 14, and the outer peripheral portion on one end side of the partition member 26 is The annular constricted portion 20 is overlapped in the axial direction via the seal rubber layer 24 of the second mounting bracket 14. Also, one end (upper in FIG. 1) of the fitting fitting 38 in the axial direction is overlapped with the outer peripheral portion on the other end side of the partition member 26 in the axial direction. Then, the second mounting bracket 14 is subjected to a diameter reduction process such as an eight-way drawing, so that the second mounting bracket 14 is deformed to be reduced in diameter, so that the partition member 26 and the lid member 34 and the second mounting bracket 14 are attached to the second mounting bracket 14. The seal rubber layer 24 is compressed and deformed with the metal fitting 14, and the partition member 26 and the lid member 34 are fitted and fixed to the second attachment metal 12 through the seal rubber layer 24. As a result, the other opening of the second mounting bracket 14 is covered with the lid member 34, and between the axially opposing surfaces of the main rubber elastic body 16 and the diaphragm 36 inside the second mounting bracket 14. A fluid chamber 40 hermetically sealed with respect to the external space is formed.

  A partition member 26 is fixedly supported by the second mounting member 14 in an intermediate portion in the axial direction of the fluid chamber 40, and the fluid chamber 40 is divided into two fluid-tightly. On one side (upper in FIG. 1) of the fluid chamber 40 across the partition member 26, a part of the wall portion is constituted by the main rubber elastic body 16, and pressure is applied based on elastic deformation of the main rubber elastic body 16. A pressure receiving chamber 42 in which fluctuations are generated is formed. In addition, on the other side (lower side in FIG. 1) of the fluid chamber 40 with the partition member 26 interposed therebetween, a part of the wall portion is constituted by the diaphragm 36, and the volume change can be easily performed based on the elastic deformation of the diaphragm 36. An allowed equilibrium chamber 44 is formed. The pressure receiving chamber 42 and the equilibrium chamber 44 are filled with an incompressible fluid. As the sealing fluid, for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is adopted, and in order to effectively obtain a vibration isolation effect based on a fluid action such as a resonance action of the fluid, 0.1 Pa · It is desirable to employ a low-viscosity fluid of s or less.

  Further, the peripheral edge of the opening of the circumferential groove 28 in the partition member 26 is overlapped with the second mounting bracket 14 through the seal rubber layer 24 so that the circumferential groove 28 is covered fluid-tightly by the second mounting bracket 14. Thus, an orifice passage 46 extending in a spiral shape with a predetermined length in the circumferential direction on the outer peripheral portion of the partition member 26 is formed. One end of the orifice passage 46 is connected to the pressure receiving chamber 42 through the communication window 30 of the partition member 26, and the other end of the orifice passage 46 is connected to the equilibrium chamber 44 through the communication window 32 of the partition member 26. ing. As a result, the pressure receiving chamber 42 and the equilibrium chamber 44 are communicated with each other through the orifice passage 46, and fluid flow through the orifice passage 46 is allowed between the chambers 42 and 44. By adjusting the passage length and passage cross-sectional area of the orifice passage 46, the resonance frequency of the fluid flowing through the orifice passage 46 can be tuned to the frequency range of vibration to be damped.

  Therefore, in a state where the automobile engine mount 10 is interposed between a power unit (not shown) and the vehicle body and attached to the automobile, vibrations that cause problems are caused between the first mounting bracket 12 and the second mounting bracket 14. When the pressure is input and a pressure difference is generated between the pressure receiving chamber 42 and the equilibrium chamber 44, the amount of fluid flowing through the orifice passage 46 is ensured. Based on the fluid action such as the resonance action of the fluid through the orifice passage 46, a high damping effect which is an anti-vibration effect against the vibration in question is obtained.

  Here, a plurality of inward protrusions 48 are integrally formed on the peripheral wall portion on the other opening side of the second mounting bracket 14 so as to be separated in the circumferential direction. The inward projection 48 is positioned axially inward of the other opening end of the second mounting bracket 14, that is, on the side of one opening where the main rubber elastic body 16 is provided, and the second protrusion The fitting 14 is positioned axially outward from the fitting fixing portion of the fitting 38, that is, on the other opening side. The inward protrusion 48 is a substantially semicircular or arcuate axial section curved so as to be recessed inward in the direction perpendicular to the axis from the outer peripheral surface of the second mounting bracket 14, and is one of the second mounting brackets 14. It extends continuously in a uniaxial perpendicular direction (up and down in FIG. 2) parallel to the radial direction, and both end portions in the uniaxial perpendicular direction open to the outer peripheral surface of the second mounting bracket 14.

  In particular, in the present embodiment, the pair of inward projections 48, 48 are opposed to each other in a uniaxial perpendicular direction (left and right in FIG. 2) across the central axis of the second mounting bracket 14. It is formed at equal intervals on the circumference of the second mounting bracket 14.

  In addition, since the inward protrusion 48 is formed at a position that is a predetermined distance inward in the axial direction from the other opening end of the second mounting bracket 14, A portion extending from the protrusion 48 to the other opening end portion is an end cylindrical portion 50 that extends from the inward protrusion 48 toward the outside in the axial direction (downward in FIG. 1) in a cylindrical shape. Yes.

  Further, the seal rubber layer 24 attached to the inner peripheral surface of the portion where the partition member 26 and the fitting 38 are fitted and fixed in the second mounting bracket 14 is formed on the entire inner peripheral surface and the end portion of the inner protrusion 48. The cylindrical portion 50 extends to the inner peripheral surface of the intermediate portion in the axial direction.

  These inward projections 48 and 48 and the end cylindrical portion 50 are integrally formed with the second mounting bracket 14 by bending the second mounting bracket 14 or reducing the diameter with a drawing jig (not shown). Has been. Further, when the partition member 26 and the fitting metal 38 are fitted and fixed to the second fitting 14, the inner projections 48, 48 and the end portions are reduced as the second fitting 14 is reduced in diameter. The cylindrical portion 50 is displaced in a reduced diameter toward the inside in the direction perpendicular to the axis. Here, before the fitting member 38 is fixed to the second mounting member 14, the fitting member 38 is positioned outward in the direction perpendicular to the axial direction from the fitting member 38 and is positioned inward in the axial direction. As the protrusion 48 is displaced inward in the direction perpendicular to the axis, the seal rubber layer 24 attached to the axially inner side surface 52 of the inner protrusion 48 is formed between the inner protrusion 48 and the fitting. 38 is compressed and deformed. As a result, the seal rubber layer 24 attached to the inner peripheral surface of the inner protrusion 48 is bulged and deformed inward in the direction perpendicular to the axis, and the outer peripheral surface of the seal rubber layer 24 is the outer side in the axial direction of the fitting 38. It is in contact with the end (surface). As a result, the fitting member 38 is subjected to a pressing force that is pressed inward in the axial direction based on the elastic action of the seal rubber layer 24, and overlaps the fitting member 38 and the fitting member 38 in the axial direction. The partition member 26 is elastically pinched and supported via the seal rubber layer 24 between the axial direction of the annular constriction 20 and the inward projection 48 in the second mounting bracket 14.

  In the present embodiment, when the distance between the central axis L1 of the second mounting bracket 14 and the fitting bracket 38 in the direction perpendicular to the axis is the outer diameter dimension d1 of the lid member 34, the outside of the lid member 34 The diameter dimension: d1 is larger than the separation distance: d2 in the direction perpendicular to the axis between the central axis: L1 and the projecting vertex in the direction perpendicular to the axis of the inward projection 48. Therefore, the projecting apexes of the inward protrusions 48 and 48 and the fitting 38 of the lid member 34 overlap in the direction perpendicular to the axis, and the axial positioning of the lid member 34 in the second mounting bracket 14 is performed. Prevention of slipping out is achieved more effectively. In addition, the lid member 34 is prevented from coming off from the second mounting bracket 14 regardless of the shape or size of the seal rubber layer 24.

  A specific example of a preferable manufacturing method for manufacturing the automobile engine mount 10 having the above-described structure will be described below, but the present invention is not limited to such a specific example.

  First, when the first mounting bracket 12 and the second mounting bracket 14 are set in the vulcanization mold of the main rubber elastic body 16 and the seal rubber layer 24, one opening portion side of the second mounting bracket 14 is previously set. Is formed with an annular constriction 20. In addition, a pair of inward projections 48 and 48 are integrally formed on the peripheral wall portion on the other opening side of the second mounting bracket 14, and the inward projection is based on the formation of the inward projections 48 and 48. A cylindrical end cylindrical portion 50 is integrally formed so as to extend outward in the axial direction from the portion 48.

  The second mounting bracket 14 including the annular constricted portion 20, the inward projecting portion 48, and the end cylindrical portion 50 is used as a vulcanization mold for the main rubber elastic body 16 and the seal rubber layer 24 together with the first mounting bracket 12. By setting and vulcanization molding, an integral vulcanization molded product of the main rubber elastic body 16 having the first and second mounting brackets 12 and 14 as shown in FIG. 3 is prepared.

  Here, the seal rubber layer 24 includes an inner peripheral surface of a flat plate-like portion extending in a direction perpendicular to the axis from the projecting vertex of the annular constricted portion 20, an inner peripheral surface of a cylindrical portion extending in the axial direction of the second mounting bracket 14, and an inward side. The entire inner peripheral surface from the inner peripheral surface of the projecting portion 48 and the end portion on the inner projecting portion 48 side of the end tubular portion 50 to the intermediate portion in the axial direction is vulcanized and bonded. As is clear from this, the end biting portion of the seal rubber layer 24 is set to an intermediate portion in the axial direction of the end cylindrical portion 50.

  Further, the entire inner peripheral surface of the sealing rubber layer 24 formed on the other side in the axial direction from the annular constricted portion 20 in the second mounting bracket 14 protrudes inward in the direction perpendicular to the axis of the inward protruding portion 48. It extends in a cylindrical shape in the axial direction in a form positioned inwardly in the direction perpendicular to the axis from the apex. That is, in the preparation process of the integrally vulcanized molded product of the main rubber elastic body 16 according to the present embodiment, the inner peripheral surface of the seal rubber layer 24 is inwardly projected from the end cylindrical portion 50 of the second mounting bracket 14. 48 and the whole of the fitting region of the partition member 26 and fitting fitting 38, which will be described later, are formed as a cylindrical inner peripheral surface having a constant inner diameter.

  On the other hand, a partition member 26 and a lid member 34 having an outer diameter smaller than the inner diameter of the cylindrical inner peripheral surface of the seal rubber layer 24 are prepared. In particular, the lid member 34 according to the present embodiment is an integrally vulcanized molded product of the diaphragm 36 provided with a fitting 38 having an outer diameter smaller than the inner diameter of the cylindrical inner peripheral surface of the seal rubber layer 24.

  Further, in the incompressible fluid, the partition member 26 and the lid member 34 are inserted from the other opening side of the second mounting bracket 14 in the integrally vulcanized molded product of the main rubber elastic body 16, so that the partition member 26 The outer peripheral portion on the distal end side (upper in FIG. 1) in the insertion direction is overlaid on the annular constricted portion 20 via the seal rubber layer 24, and the end on the distal end side in the insertion direction in the fitting 38 of the lid member 34. The fitting portion 38 is positioned axially inward of the inner protrusion 48 by superimposing the portion on the outer peripheral portion of the partition member 26. Thus, a fluid chamber 40 filled with an incompressible fluid is defined between the main rubber elastic body 16 constituting the interior of the automobile engine mount 10 and the axially opposed surfaces of the diaphragm 36.

  FIG. 4 shows a state in which the partition member 26 and the lid member 34 are inserted into the integrally vulcanized molded product of the main rubber elastic body 16 shown in FIG. 3 and set in a drawing jig 54 such as an eight-way drawing type. Has been. In the drawing process, a known eight-way drawing type drawing jig 54 is overlapped in the direction perpendicular to the axis from the outer peripheral side of the second mounting bracket 14 in the incompressible fluid, and the second mounting bracket 14 is pivoted. By applying a pressing force directed inward in the perpendicular direction, the second mounting bracket 14 is deformed in a reduced diameter. Here, the inner peripheral surface overlaid on the second mounting bracket 14 of the drawing jig 54 is the outer peripheral surface of the cylindrical portion of the intermediate portion in the axial direction of the second mounting bracket 14 or the outer periphery of the end cylindrical portion 50. A cross-sectional shape continuously extending in the axial direction corresponding to the surface is provided, and when the diameter of the second mounting bracket 14 is reduced, the inner peripheral surface of the squeezing jig 54 is the cylindrical portion or end of the second mounting bracket 14. It overlaps with substantially the entire outer peripheral surface of the cylindrical part 50. That is, the drawing jig 54 according to the present embodiment does not have a complicated inner peripheral surface shape or protrusion that fits into the annular constriction 20 or the inner protrusion 48 of the second mounting bracket 14. .

  As a result, according to the diameter-reducing deformation of the second mounting bracket 14 by the drawing jig 54 as described above, the annular constricted portion 20 and the inward projection 48 are substantially kept in the shape before the diameter-reducing deformation. The entire mounting bracket 14 is reduced inward in the direction perpendicular to the axis.

  Thus, the partition member 26 in a state where the seal rubber layer 24 having the cylindrical inner peripheral surface is compressed and deformed by a predetermined amount between the partition member 26 and the fitting member 38 and the second mounting member 14 in the direction perpendicular to the axis. The fitting metal 38 and the second mounting metal 14 are overlapped in the direction perpendicular to the axis with the seal rubber layer 24 interposed therebetween.

  Accordingly, the seal rubber layer 24 attached to the axially inner side surface 52 of the inner protrusion 48 is fitted to the inner protrusion 48 in accordance with the displacement of the inner protrusion 48 in the direction perpendicular to the axis. It is compressed and deformed between the metal fittings 38 and is bulged and deformed so as to escape outward in the axial direction of the fitting metal 38 in the direction perpendicular to the axis of the inward projection 48. The outer peripheral surface of the bulging and deformed seal rubber layer 24 is brought into contact with the axially outer end of the fitting 38.

  Thereby, a pressing force is applied to the fitting 38 in the axial direction based on the elastic action of the seal rubber layer 24, and the fitting 38 and the fitting 38 are overlapped in the axial direction. The partition member 26 is elastically pinched and supported via the seal rubber layer 24 between the axial direction of the annular constriction 20 and the inward projection 48 in the second mounting bracket 14. At this time, the outer diameter dimension d1 of the lid member 34 is the distance in the axis perpendicular direction between the central axis L1 of the second mounting bracket 14 and the projecting vertex in the direction perpendicular to the axis of the inner projection 48 in the axis perpendicular direction: d2. The second mounting bracket 14 is drawn so as to be larger. As a result, the partition member 26 and the fitting fitting 38 are fitted and fixed to the second fitting 14, and the other opening of the second fitting 14 is closed, whereby the automobile engine mount 10 is realized.

  In the automotive engine mount 10 having the above-described structure, a pair of inward projections 48, 48 projecting inward in the direction perpendicular to the axis in the vicinity of the other opening side of the second mounting bracket 14 is a seal rubber. By contacting the fitting member 38 of the lid member 34 via the layer 24, a pressing force is applied to press the lid member 34 toward the inner side in the axial direction of the second mounting member 14. . Furthermore, the protruding apexes of the inward protrusions 48 and 48 and the fittings 38 of the lid member 34 overlap in the direction perpendicular to the axis. Thereby, positioning of the lid member 34 in the second mounting member 14 in the axial direction and prevention of slipping out are effectively achieved.

  In particular, in the present embodiment, a pair of inward protrusions 48 extending with a relatively large width dimension in the vertical direction in FIG. 2 are formed at equal intervals on the circumference of the second mounting bracket 14. The effect of preventing the lid member 34 from coming off due to the pressing action of the inward projection 48 can be exhibited extremely effectively.

  In addition, since the inward projecting portion 48 does not extend continuously in the circumferential direction of the second mounting bracket 14 but is formed to be spaced apart in the circumferential direction, one of the methods for manufacturing the automobile engine mount 10 described above is provided. As shown in the specific example, the inward protrusion 48 is formed by bending the second mounting bracket 14 in advance before the lid member 34 is fitted and fixed to the second mounting bracket 14. It can be easily realized.

  In addition, it is not necessary to form the inward protrusion 48 when the diameter of the second mounting bracket 14 is reduced, and the inner protrusion 48 is partially formed on the circumference of the second mounting bracket 14. Thus, even if the drawing jig 54 is not fitted and supported by the inward projection 48, the second mounting bracket 14 is superposed and stabilized on the circumference where the inward projection is not formed. Therefore, the squeezing jig 54 can be realized with a simple structure as illustrated.

  Further, since the end cylindrical portion 50 is formed on the outer side of the inward projection 48 in the axial direction, the strength of the inward projection 48 is improved, and the axial positioning force and removal of the lid member 34 are improved. In addition to the fact that the drag force can be further improved, the end cylindrical portion 50 is used for the overlapping portion of the drawing jig 54, and as a result, from the cylindrical portion of the second mounting bracket 14 to the other opening end portion. Thus, the pressing force can be stably applied until the second mounting bracket 14 having the target inward protrusion 48 is accurately realized.

  Furthermore, in the step of preparing the integrally vulcanized molded product of the main rubber elastic body 16, the fitting region of the inner projecting portion 48, the lid member 34, and the partition member 26 from the end tubular portion 50 of the second mounting bracket 14. In addition to the inner peripheral surface of the sealing rubber layer 24 to be applied over the whole being a cylindrical inner peripheral surface having a constant inner diameter, the end biting portion of the main rubber elastic body 16 is a second one. Therefore, the structure of the vulcanization mold of the main rubber elastic body 16 and the seal rubber layer 24 can be simplified.

  Therefore, in the automobile engine mount 10 having the structure according to the present embodiment, the sealing performance of the fluid chamber 40 is improved while the manufacturing process is advantageously shortened and the cost is reduced. The effect can be obtained stably.

  Hereinafter, several automotive engine mounts of a form different from the automotive engine mount 10 of the first embodiment of the present invention will be illustrated and exemplified. In the following embodiments, members and parts having substantially the same structure as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed descriptions thereof are given. Omitted.

  That is, in the automobile engine mount as the second embodiment of the present invention shown in FIG. 5, the inward projection 56 formed on the peripheral wall portion on the other opening side of the second mounting bracket 14 has a shaft. It is a bent cross section that is convex inward in the perpendicular direction, and extends in the direction of the plane of FIG. Similarly to the first embodiment, the seal rubber layer 24 extends from the end cylindrical portion 50 of the second mounting member 14 to the entire fitting region of the inward protruding portion 56, the lid member 34, and the partition member 26. Are formed. Then, when the fitting member 38 of the lid member 34 is fitted and fixed to the second mounting member 14, along with the diameter reduction of the second mounting member 14, the inner protrusion 56 is axially inward. The seal rubber layer 24 attached to the side surface 58 is compressed and deformed between the inward projection 56 and the axially outer end of the fitting 38, so that the lid member 34 is attached to the shaft of the second fitting 14. A pressing force that presses inward in the direction is applied.

  In this state, the side surface 58 that is positioned inward in the axial direction with the axially inward protruding vertex of the inward protruding portion 58 sandwiched between the fitting member 38 and the second mounting member 14 is an automobile. One-axis perpendicular direction line: L2 for the engine mount 10 (second mounting bracket 14) toward the axially inward (upward in FIG. 4) of the second mounting bracket 14 at a predetermined angle α. The surface is inclined. Such an inclination angle: α is, for example, 10 to 80 °, preferably 30 to 70 °.

  According to the automotive engine mount according to the second embodiment, the axially inner side surface 58 of the inward projection 56 is an inclined surface that is inclined inward in the axial direction. : The axial positioning force of the lid member 34 in the second mounting bracket 14 can be easily set by the component force corresponding to α. Therefore, the reliability can be further improved with respect to the axial positioning of the lid member 34 in the second mounting bracket 14 and the prevention of the lid member 34 from coming out of the other opening of the second mounting bracket 14. .

  Further, in the second mounting bracket 14 in the first embodiment or the second embodiment, an end cylindrical portion 50 that extends in a cylindrical shape outward in the axial direction of the inward projections 48 and 56 is integrally formed. However, the end cylindrical portion 50 is not an essential constituent element. For example, like the automobile engine mount as the third embodiment of the present invention shown in FIG. The inward protrusion 60 may be formed so as to extend to the other opening end of the second mounting member 14 outside in the axial direction from the fitting region of the lid member 34. The inward protrusion 60 according to the present embodiment has a predetermined angle: α with respect to the uniaxial perpendicular line L2 of the engine mount 10 (second mounting bracket 14) for the automobile, and the axial direction of the second mounting bracket 14. An inclined portion 62 that is inclined inward and a straight portion 64 that extends in the axial direction from an axially outer end portion of the inclined portion 62 are configured. Thereby, the protrusion vertex in the direction perpendicular to the axis of the inward protrusion 60 according to the present embodiment is configured to include the entire connection end portion of the inclined portion 62 and the straight portion 64 and the entire inner peripheral portion of the straight portion 64. ing.

  As in the first and second embodiments, the inner surface of the inclined portion 62 that is the side surface 58 on the inner side in the axial direction of the inner protrusion 60 is attached along with the diameter reduction of the second mounting bracket 14. The sealed rubber layer 24 is compressed and deformed between the inner protrusion 60 and the outer end of the fitting 38 in the axial direction, so that the lid member 34 is directed inward in the axial direction of the second fitting 14. The pressing force that presses is applied.

  Therefore, in the automobile engine mount according to the third embodiment, the projecting vertex of the inner projecting portion 60 in the direction perpendicular to the axis is the connecting end portion of the inclined portion 62 and the straight portion 62 and the inner periphery of the straight portion 64. Including the entire portion, a large amount is secured, whereby the resistance of the lid member 34 to come off from the second mounting member 14 based on the tilting action of the tilted portion 62 of the inner projecting portion 60 is reduced. It can be further improved by utilizing the rigidity of 60.

  The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific descriptions in the embodiments, and various changes, modifications, and improvements based on the knowledge of those skilled in the art. Needless to say, any of these embodiments can be included in the scope of the present invention without departing from the spirit of the present invention.

  For example, the shape, size, structure, arrangement, number, and the like of the partition member 26, the lid member 34, the second mounting bracket 14, the inward protrusions 48, 56, 60, the seal rubber layer 24, and the like, and an automobile engine The manufacturing method of the mount 10 is not limited to the one illustrated.

  In the first to third embodiments, the seal rubber layer 24 covers the entire inner protrusions 48, 56, 60 from the fitting region of the partition member 26 and the fitting metal 38 in the second attachment fitting 14, Further, it extends to the axially intermediate portion of the end cylindrical portion 50, but extends to the axially inward side surface of the inner protrusion, and the axially outward side surface and end of the inward protrusion. It is not necessary to adhere to the inner peripheral surface of the cylindrical portion.

  Moreover, in the said embodiment, in the preparatory process of the integral vulcanization molded product of the main body rubber elastic body 16, the inner side protrusion part 48, the cover member 34, and the partition member 26 from the edge part cylindrical part 50 of the 2nd attachment metal fitting 14 are shown. The inner peripheral surface of the sealing rubber layer 24 to be applied over the entire fitting region is a cylindrical inner peripheral surface having a constant inner diameter. For example, the inner peripheral surface of the inner protrusion of the sealing rubber layer The portion to be attached to the shaft extends from the cylindrical inner peripheral surface in the region where the seal rubber layer overlaps with the partition member and the lid member by extending with a constant thickness along the inner peripheral surface shape of the inner protrusion. It is also possible to have a shape protruding inward in the perpendicular direction.

  Moreover, in the said embodiment, although the diameter reduction process of the 2nd attachment bracket 14 using the aperture jig | tool 54 was performed in the incompressible fluid, it is also possible to carry out in air | atmosphere.

  Furthermore, the drawing jig 54 is not limited to the structure as illustrated, and has, for example, an inner peripheral surface shape or a protrusion that fits into the inner protrusion or the annular constriction of the second mounting bracket. May be.

  Furthermore, a protrusion or the like provided on the squeezing jig is fitted into the inward protrusion, and the inner protrusion is pressed by the protrusion along with the diameter reduction processing of the second mounting bracket. It is also possible to project more greatly inward in the direction perpendicular to the axis. Based on the projecting deformation of the inward projecting portion, the seal rubber layer attached to the inner peripheral surface of the inward projecting portion can be greatly projected inward in the direction perpendicular to the axis from the cylindrical inner peripheral surface. Accordingly, it is possible to increase the contact portion with the seal rubber layer at the axially outer end portion of the fitting, thereby further improving the detachment resistance of the lid member.

  Moreover, in the said embodiment, compared with the separation distance d2 in the direction perpendicular to the axis between the central axis L1 of the second mounting bracket 14 and the projection vertices of the inward projections 48, 56, 60, the lid member 34 The outer diameter dimension d1 of the fitting metal 38 is larger than the center axis L1 and the inner diameter of the second fitting 14 as in the fourth embodiment of the present invention shown in FIG. A structure is adopted in which the outer diameter dimension d1 of the lid member 34 (fitting fitting 38) is smaller than the separation distance d2 ′ in the direction perpendicular to the axis from the projection apex of the direction projection 48 ′. Also good. According to such a structure, the inward protrusion 48 'of the second mounting bracket 14 can be manufactured by a simple bending process. Note that the outer diameter dimension d1 of the lid member 34 in this aspect is the same as the outer diameter dimension d1 of the lid member 34 (fitting fitting 38) of the above-described embodiment. The distance to the fitting surface with respect to the 2nd attachment bracket 14 is said.

  Further, the lid member is inserted inward in the axial direction from the inward projection of the second mounting bracket, and the inward projection is deformed or reduced in diameter so that the inward projection is a seal rubber layer. You may make it make it oppose to an insertion metal fitting in the axial direction on both sides of. As a result, it is possible to further improve the detachment resistance of the lid member from the second mounting bracket by utilizing the rigidity of the inward projection.

  In addition, the annular constricted portion 20 in the second mounting bracket 14 is formed directly on the second mounting bracket 14, but for example, in JP-A-10-252807 and JP-A-2007-205437, etc. As shown, the partition member extends to one side of the fitting by means of a rubber block or the like protruding inward in the direction perpendicular to the axis by being attached to the inner peripheral surface of the second fitting. You may comprise the annular constriction part to support.

  Further, the lid member 34 is not limited to the structure in which the fitting 38 is vulcanized and bonded to the outer peripheral edge portion of the thin diaphragm 36 as illustrated, for example, the entire lid member is constituted by a hard plate member. It is also possible.

  Further, in the automobile engine mount according to the embodiment, the structure in which the single orifice passage 46 is provided is adopted. For example, the orifice passage is higher than the first orifice passage and the first orifice passage. A structure in which a second orifice passage tuned in the frequency range is provided may be employed. Thus, for example, when vibrations that are likely to cause problems are present in the low-frequency range and the middle to high-frequency range, the resonance frequency of each fluid that flows through the first orifice passage and the second orifice passage is reduced. By tuning to the frequency range and the high frequency range, the vibration isolation effect can be effectively exhibited against a plurality of vibrations.

  Further, for example, various movable plates that adjust pressure fluctuations are provided by being displaced based on a relative pressure difference between the pressure receiving chamber and the equilibrium chamber in a partition member or the like disposed between the pressure receiving chamber and the equilibrium chamber. May be. For example, as shown in Japanese Patent Application Laid-Open No. 01-93638 and Japanese Patent Application Laid-Open No. 2005-273684, a movable plate is accommodated and arranged in a non-adhesive manner in a predetermined accommodation area formed in the partition member. In the accommodating area, it is possible to make a minute displacement in the plate thickness direction, and through the through hole formed in the accommodating area, the pressure of the pressure receiving chamber is applied to one surface of the movable plate and the pressure of the equilibrium chamber is adjusted to the other of the movable plate. By acting on the surface, the relative pressure difference between the pressure receiving chamber and the equilibrium chamber is absorbed based on the minute displacement of the movable plate in the accommodation area, and pressure absorption exceeding the displacement allowable amount of the movable plate is prevented. This structure can be adopted. Alternatively, for example, as disclosed in Japanese Patent Application Laid-Open No. 10-252807 and Japanese Patent Application Laid-Open No. 2000-186739, at least an outer peripheral portion of the movable plate is configured by a partition rubber elastic plate, and the partition rubber elastic plate By fixing the outer peripheral edge to the partition member or the second mounting member, the pressure receiving chamber and the equilibrium chamber are configured to be fluid-tightly partitioned so that the pressure receiving chamber exerted on each surface of the partition rubber elastic plate Based on the elastic displacement or elastic deformation of the partition rubber elastic plate based on the pressure difference between the partition rubber and the equilibrium chamber, the relative pressure difference between the pressure receiving chamber and the equilibrium chamber is absorbed, and a large pressure is absorbed by the elastic deformation of the partition rubber elastic plate. It is also possible to adopt a structure that prevents the above.

  In addition, in the above-described embodiments, specific examples of applying the present invention to an automobile engine mount have been described. However, the present invention is not limited to an automobile body mount, a differential mount, a suspension member mount, etc. Any of them can be applied to the body vibration isolator.

It is a longitudinal cross-sectional view of the engine mount for motor vehicles as 1st embodiment of this invention, Comprising: The figure equivalent to the II cross section of FIG. II-II sectional drawing of FIG. The longitudinal cross-sectional view of the integral vulcanization molding product of the main body rubber elastic body which comprises a part of engine mount for the vehicles. The longitudinal cross-sectional view which shows one manufacturing process of the engine mount for the motor vehicles. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for motor vehicles as 2nd embodiment of this invention. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for motor vehicles as 3rd embodiment of this invention. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount for motor vehicles as 4th embodiment of this invention.

Explanation of symbols

10: engine mount for automobile, 12: first mounting bracket, 14: second mounting bracket, 16: rubber elastic body of main body, 20: annular constriction, 24: seal rubber layer, 34: lid member, 48: inward Projection, 52: axially inner side

Claims (7)

The first mounting member is spaced apart from one opening side of the cylindrical second mounting member, and the first mounting member and the second mounting member are connected by the main rubber elastic body, thereby The one opening of the second mounting member is closed, and a lid member is inserted from the other opening side of the second mounting member, and the lid member is reduced by the reduced diameter of the second mounting member. A fluid chamber in which an incompressible fluid is sealed is formed by fitting and fixing to the other opening of the second mounting member and closing the other opening of the second mounting member. In the formed fluid-filled vibration isolator,
An annular constriction constricted inward is formed in the one opening of the second attachment member, while an inner constriction is formed in the peripheral wall of the second attachment member on the other opening side. At least two inward projections projecting to the circumferential side are formed on the circumference, and the lid member including the inner projection forming portion is fitted on the inner peripheral surface of the second mounting member. A seal rubber layer is formed on the portion, and the lid member is positioned inward in the axial direction of the second mounting member relative to the inward projections, and the diameter of the second mounting member is reduced. Thus, the fluid-filled type vibration damping device is characterized in that the axially inner side surfaces of these inward projections are in contact with the axially outer end of the lid member via the seal rubber layer.   An axially inner side surface of the inward projecting portion of the second mounting member that is in contact with the axially outer end portion of the lid member via the seal rubber layer is the second mounting member. The fluid-filled vibration isolator according to claim 1, wherein the fluid-filled vibration isolator is an inclined surface inclined inward in the axial direction with respect to a line perpendicular to the axis.   The fluid-filled vibration isolator according to claim 1 or 2, wherein the inward protrusions of the second mounting member are formed at equal intervals on the circumference of the second mounting member.   The fluid-filled vibration isolator according to any one of claims 1 to 3, wherein the lid member has a structure in which an annular fitting is vulcanized and bonded to an outer peripheral edge portion of a rubber film.   In the second attachment member, the inward protrusion has a cross-sectional shape recessed inward, and the second attachment member is further cylindrical outward in the axial direction than the inward protrusion. The fluid-filled vibration isolator according to any one of claims 1 to 4, further comprising an end cylindrical portion extending in a shape. The first mounting member is spaced apart from the one opening side of the cylindrical second mounting member, while the one opening of the second mounting member has an annular constriction constricted inward. And forming at least two inwardly protruding portions on the circumference on the peripheral wall portion on the other opening side of the second mounting member on the circumference, and the first mounting member and the first mounting member An inner circumference including the forming portion of the second projecting member of the second mounting member while closing the one opening of the second mounting member by connecting the two mounting members with a rubber elastic body. A step of preparing an integral vulcanization molded product of a main rubber elastic body provided with the first mounting member and the second mounting member by forming a seal rubber layer on the surface;
Preparing a lid member having an outer diameter smaller than the inner diameter of the other opening of the second mounting member;
In the incompressible fluid, the lid member is inserted from the other opening side of the second mounting member in the integrally vulcanized molded product of the main rubber elastic body, and the lid member is inserted from the inward projection. Forming a fluid chamber filled with an incompressible fluid by positioning the second mounting member in an axially inward direction; and
The second mounting member is deformed in a reduced diameter, and the inner protrusion is brought into contact with the outer end of the lid member in the axial direction through the seal rubber layer. Fitting and fixing to the other opening of the mounting member to close the other opening of the second mounting member;
A method for manufacturing a fluid filled type vibration damping device, comprising:   In the step of preparing an integrally vulcanized molded product of the main rubber elastic body, the inner peripheral surface of the seal rubber layer is a cylinder having a constant inner diameter from the inward projection to the entire fitting region of the lid member. The method for manufacturing a fluid filled type vibration damping device according to claim 6, wherein the fluid filled type vibration damping device is molded as an inner peripheral surface.

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