JP2005315375A - Fluid sealed type vibration isolator and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid sealed type vibration isolator of a new structure, assembling a shock absorbing rubber and a flexible film by a simple structure in addition to effectively securing characteristics required for the shock absorbing rubber and the flexible film, thereby advantageously reducing the manufacturing cost based on decrease in number of parts and simplifying the manufacturing process. <P>SOLUTION: The shock absorbing rubber 102 is formed integrally with the flexible film 28 to fix a second abutting part 100, the outer peripheral edge part of the second abutting part 100 is provided with a reinforcement rib 104 projected toward the first abutting part 88, whereby the outer peripheral part of the shock absorbing rubber 102 is supported by the reinforcement rib 104. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a fluid sealing applied to suspension bushes, differential mounts, body mounts, engine mounts and the like in automobiles by exhibiting an anti-vibration effect based on the flow action of the incompressible fluid sealed inside. In particular, a fluid-filled vibration isolator having a novel structure having a stopper mechanism for buffering the relative displacement amount between both members to be anti-vibration connected when an excessive vibration load is input and the fluid The present invention relates to a novel manufacturing method of a sealed vibration isolator.

  Conventionally, as a kind of anti-vibration coupling body and anti-vibration support body interposed between members constituting a vibration transmission system such as an engine mount, body mount, cab mount, etc. for automobiles, for example, in Patent Document 1 As shown, the main rubber elastic body connects the first mounting bracket attached to one member to be anti-vibrated and the second mounting bracket attached to the other member with the main rubber elastic body. A pressure receiving chamber in which a part of the wall is formed and an equilibrium chamber in which a part of the wall is configured by an easily deformable flexible film are formed, and an incompressible fluid is sealed in both the chambers. At the same time, by communicating the two chambers with each other through the orifice passage, a vibration-proofing effect can be obtained based on the fluid action of the fluid flowing through the orifice passage when vibration is input between the first attachment fitting and the second attachment fitting. As demonstrated In the fluid-filled vibration isolator, a flexible membrane is disposed so as to cover the outside of the main rubber elastic body that constitutes a part of the wall of the pressure receiving chamber, so that the main rubber elastic body is sandwiched between them. There is known a vibration isolator in which an equilibrium chamber is formed on the side opposite to the pressure receiving chamber. In the fluid-filled vibration isolator having such a structure, the size of the mount axis direction, which is the opposite direction of the first mounting bracket and the second mounting bracket, is reduced, and the elastic center of the vibration isolator is supported. There is a technical effect that it can be set at a low position from the surface, and application to, for example, an automobile engine mount has been studied.

  By the way, in such a fluid-filled vibration isolator, in order to limit the relative displacement amount between the first mounting bracket and the second mounting bracket when an excessive vibration is input, for example, Patent Document 2 As shown, the contact portion (not shown) is fixed to the first mounting bracket by providing a contact portion so as to spread outward from the part of the circumference of the second mounting bracket in the direction perpendicular to the axis. Attaching the stopper rubber to the surface of the abutting portion opposed to the abutting metal fittings while positioning them opposite to the metal fittings etc. in the axial direction makes it excessive between the first and second fittings. When vibration is input, the first fitting and the first fitting are brought into contact with the contact portion of the second mounting bracket and the contact bracket fixed to the first mounting bracket via the stopper rubber. The amount of displacement in the direction in which the two mounting brackets approach each other is limited in a buffering manner. And so, sometimes called bound stopper mechanism is provided.

  Therefore, in the stopper rubber of such a bound stopper mechanism, since generally large load bearing performance and damping performance are required, as disclosed in Patent Document 2, It is integrally formed.

  However, in the fluid-filled vibration isolator having the specific structure as described above targeted by the present invention, since the flexible film is disposed so as to cover the outside of the main rubber elastic body, the main rubber elastic body When the stopper rubber formed integrally with the stopper rubber is adopted, the stopper rubber protrudes from the main rubber elastic body positioned in the liquid chamber to the outside of the liquid chamber. As a result, the main rubber elastic body is made of a flexible film. Since the structure for sealing the outside becomes complicated and it is difficult to ensure fluid tightness of the equilibrium chamber or the like, it is difficult to adopt a structure in which the stopper rubber is integrally formed of the main rubber elastic body.

  In order to cope with such a problem, for example, it is conceivable that the stopper rubber is integrally formed with a flexible film disposed on the outermost part of the vibration isolator, but the flexible film and the stopper rubber are required. The rubber properties are very different and contradictory, and it is difficult for those skilled in the art to put it to practical use. The flexible membrane is required to have a thin and flexible characteristic in order to ensure the ease of deformation, and is sufficient for liquid impermeability and weather resistance even with a thin wall, while being subjected to a large load. Since it is not exerted, load bearing performance and damping performance are not required. On the other hand, the stopper rubber is required to have a sufficient durability performance against a heavy load and a large damping performance, but does not require liquid impermeability or the like.

  For this reason, in a fluid-filled vibration isolator having a conventional structure, for example, the flexible film is formed of a synthetic rubber such as ethylene propylene rubber (EPM, EPDM), while the stopper rubber is made of natural rubber (NR) or natural rubber. Forming with a rubber material mixed with synthetic rubber such as styrene butadiene rubber (SBR) with high damping, or adjusting the composition of rubber materials used to form flexible films and stopper rubber, etc. Therefore, it was made to correspond to the different required characteristics of the flexible membrane and the stopper rubber.

  By the way, in order to achieve sufficient load bearing performance and damping performance in the stopper rubber integrally formed with the flexible membrane, when they are integrally formed with natural rubber, etc., liquid impermeability in the flexible membrane. In order to realize the above, it is necessary to make the wall considerably thicker.As a result, sufficient flexibility cannot be realized in the flexible film, and a large strain is generated at the time of deformation, and a crack is easily generated. There is a problem that it is difficult to ensure durability. On the other hand, in order to realize sufficient deformability, durability, and liquid impermeability in the flexible film integrally formed with the stopper rubber, when they are integrally formed with a synthetic rubber such as EPDM, the stopper rubber However, there is a problem that the load bearing performance and damping performance are not fully exhibited.

  In particular, in the fluid-filled vibration isolator as described above, which is the subject of the present invention, the bound stopper mechanism is compared with the opening peripheral portion of the second mounting bracket due to restrictions on the installation space of the vibration isolator and the mounting structure. Therefore, there is an inherent problem that it is difficult to ensure a sufficient volume of the stopper rubber. For this reason, the stopper rubber requires higher load-bearing performance, weather resistance, and damping performance. Therefore, it is difficult to integrally form the stopper rubber with the flexible film. .

  Therefore, in order to cope with the above-described problems, conventionally, as described in Patent Document 1 described above, the stopper rubber is formed separately from either the main rubber elastic body or the flexible film. Then, a structure has been adopted in which the second mounting bracket is fixed and mounted afterward using fixing means such as bolts, press-fitting, adhesion, and caulking.

  However, in such a conventional fluid-filled vibration isolator, a mold or a molding material is separately prepared for forming a main rubber elastic body, a stopper rubber, a flexible film, etc. There are inherent problems that the manufacturing process is complicated and the number of parts is increased because the work of assembling the film and stopper rubber is particularly necessary. The problem of high cost burden was inevitable.

JP 2003-184943 A JP 2003-4085 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the characteristics required for the buffer rubber and the flexible film are effectively ensured respectively. In addition to this, a new structure that can advantageously reduce the manufacturing cost and simplify the manufacturing process by reducing the number of parts by assembling the cushion rubber and flexible film with a simple structure And providing a novel manufacturing method of the 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.

(Aspect 1 of the present invention relating to a fluid-filled vibration isolator)
A feature of the first aspect of the present invention relating to the fluid-filled vibration isolator is that a central portion of the main rubber elastic body constituting a part of the wall portion of the pressure receiving chamber in which the incompressible fluid is sealed and vibration is input At the same time, the main rubber rubber fitting is bonded to the outer peripheral portion of the main rubber elastic body, while the main rubber elastic metal member is bonded to the outer peripheral portion of the main rubber elastic body. Attach the membrane center bracket and attach the membrane periphery bracket to the outer periphery of the flexible membrane, and attach the main rubber center bracket and the membrane center bracket to each other for vibration isolation And a second mounting member that is attached to the other member that is vibration-proof connected by fixing the main body rubber outer peripheral bracket and the membrane outer peripheral bracket to each other. On the opposite side of the pressure receiving chamber across the elastic body A part of the wall portion is formed of a flexible film to form an equilibrium chamber in which an incompressible fluid is enclosed, and an orifice passage that connects the pressure receiving chamber and the equilibrium chamber to each other is formed. A first contact portion that extends outward in a direction substantially perpendicular to the axis is provided on the attachment member, and a second contact portion that extends outward in a direction substantially perpendicular to the axis is provided on the second attachment member, The first contact portion and the second contact portion are separated from each other in a substantially axial direction and are opposed to each other, and a buffer rubber is provided between the first contact portion and the second contact portion. In the fluid-filled vibration isolator having a stopper mechanism, the buffer rubber is integrally formed with the flexible film and fixed to the second contact portion, and an outer peripheral edge portion of the second contact portion A reinforcing rib that protrudes toward the first abutting portion, and the outer peripheral portion of the cushioning rubber is disposed on the reinforcing rib. In the fluid-filled vibration damping device allowed more support.

  In the fluid-filled vibration isolator having the structure according to this aspect, the cushioning rubber and the flexible film are integrally formed, so that the second mounting member configured to include the film outer peripheral metal fitting is provided. As a result, the step of assembling the cushioning rubber and the flexible membrane is omitted, so that the manufacturing efficiency can be improved with the simplification of the manufacturing process. Moreover, in addition to eliminating the need to prepare separate molding molds for the buffer rubber and the flexible membrane, the second rubber can be used by utilizing the center metal fitting or the outer membrane fitting in which the cushion rubber is bonded to the flexible membrane. By being assembled to the mounting member, the number of parts can be efficiently reduced, and a reduction in weight, a reduction in manufacturing cost, and the like can be advantageously realized.

  In addition, for example, if the cushioning rubber and the flexible film are integrally formed using a molding material that ensures the deformability, liquid impermeability, weather resistance, etc. required for the flexible film, it is acceptable. Needless to say, the required characteristics of the flexible film are secured, and the buffer rubber is greatly elastically deformed outward in the direction perpendicular to the axis based on the outer periphery of the buffer rubber being supported by the reinforcing ribs. Therefore, the occurrence of large distortion in the buffer rubber is reduced or avoided. Further, since the reinforcing rib is formed on the second contact portion, the strength of the second contact portion is increased, and a large contact area of the buffer rubber with respect to the second contact portion is ensured. Accordingly, the load bearing performance of the stopper mechanism including the buffer rubber, the first contact portion, and the second contact portion can be advantageously exhibited.

  That is, in the fluid-filled vibration isolator according to this aspect, as long as the desired characteristics of the flexible film are ensured, the characteristics of the flexible film can be improved by using an appropriate material. In addition to being secured, the outer peripheral surface of the cushioning rubber is reinforced by an appropriate amount with the reinforcing ribs and the restraining force against deformation of the cushioning rubber is exerted, so that the required characteristics such as load bearing performance and damping performance of the cushioning rubber are improved. As a result, the required properties of the cushion rubber and the flexible film of the conventional structure, which are formed separately from each other due to the difference in the characteristics, are sufficiently secured, and the cushion rubber can be used. It has a great technical feature in that the flexible film can be formed integrally.

(Aspect 2 of the present invention relating to a fluid-filled vibration isolator)
A feature of the second aspect of the present invention relating to the fluid-filled vibration isolator is that a bracket member attached to one of the vibration-tightly connected members in the fluid-filled vibration isolator according to the first aspect of the present invention is provided. By fixing to the first mounting member and arranging to extend in a direction substantially perpendicular to the axis from a part of the circumference of the first mounting member, the bracket member causes the first contact portion to The second abutting portion to which the buffer rubber is fixed is partially provided on the circumference of the second mounting member, and is opposed to the bracket member in a substantially axial direction. It is located.

  In this embodiment, in addition to the second contact portion provided with the buffer rubber being partially provided on the circumference of the second mounting member, a bracket member attached to the first mounting member is used. And since the 1st contact part is comprised, the arrangement | positioning efficiency of a stopper mechanism can be improved advantageously.

  Further, even in the present aspect in which the volume of the shock absorbing rubber is reduced as the second contact portion is partially provided on the circumference, the purpose is achieved by the reinforcing rib formed on the second contact portion. By sufficiently securing the load bearing performance and the like, it is possible to advantageously realize partial provision of the buffer rubber on the circumference.

(Aspect 3 of the present invention relating to a fluid-filled vibration isolator)
A feature of aspect 3 of the present invention relating to a fluid-filled vibration isolator is that, in the fluid-filled vibration isolator according to aspect 1 or 2 of the present invention, the flexible film and the buffer rubber are synthetic rubber or It is formed integrally using a rubber material made of a synthetic rubber mixed with natural rubber.

  In this embodiment, a rubber material made of a synthetic rubber or a natural rubber mixed with a synthetic rubber, which is particularly suitable for forming a flexible film, can be used to easily deform the flexible film. Various properties such as liquid permeability and weather resistance can be more advantageously secured. Further, in this aspect, by adopting a rubber material obtained by blending natural rubber with synthetic rubber, it is possible to improve the load bearing performance and damping performance of the buffer rubber while considering the required characteristics of the flexible membrane. It becomes possible.

  Synthetic rubber materials include, for example, ethylene propylene rubber (EPM, EPDM), chloroprene rubber (CR), butyl rubber (IIR), acrylonitrile butadiene rubber (NBR), hydrogenated acrylonitrile butadiene rubber (H- NBR), styrene butadiene rubber (SBR), etc. can be used as appropriate, and natural rubber and styrene butadiene rubber (NR-SBR) can be used as a rubber material in which natural rubber is mixed with synthetic rubber. .

(Aspect 4 of the present invention relating to a fluid-filled vibration isolator)
The aspect 4 of the present invention relating to the fluid-filled vibration isolator is characterized in that, in the fluid-filled vibration isolator according to any one of the aspects 1 to 3 of the present invention, the outer peripheral side from the protruding tip portion of the reinforcing rib. And forming the cushioning rubber in a substantially trapezoidal cross-sectional shape so that the cushioning rubber has a protruding height lower than that of the cushioning rubber. This is because the cushioning rubber that extends in the direction is integrally formed.

  In this aspect, the buffer rubber is integrally formed, so that a non-linear load-deflection characteristic can be given to the stopper mechanism, and the pressure receiving area when the heavy load is applied to the buffer rubber is increased. Thus, the durability can be further improved.

(Aspect 5 of the present invention relating to a fluid-filled vibration isolator)
A feature of the fifth aspect of the present invention relating to the fluid-filled vibration isolator is that the fluid-filled vibration isolator according to any one of the first to fourth aspects of the present invention extends across the first mounting member. The gate-shaped bracket is disposed across the radially opposing portions of the second mounting member, and a rebound shock absorbing rubber is provided between the gate-shaped bracket and the first mounting member. Based on the fact that the metal fitting and the first mounting member are brought into contact with each other via the rebound shock absorbing rubber, the displacement amount of the first mounting member and the second mounting member in the direction away from each other is limited in a buffering manner. The rebound stopper mechanism is configured.

  In this aspect, for example, the bounce stopper mechanism is configured to include the first abutting portion, the second abutting portion, and the buffer rubber according to Aspect 1 of the present invention, and the rebound stopper mechanism includes the bounce stopper mechanism. By adopting in combination with the stopper mechanism, a stopper mechanism in both bound / rebound directions can be efficiently realized.

(Aspect of the present invention relating to a method for manufacturing a fluid filled type vibration damping device)
The aspect of the present invention relating to the manufacturing method of the fluid filled type vibration isolator is characterized in that (a) the main rubber center metal fitting is vulcanized and bonded to the central portion of the main rubber elastic body, and the main rubber outer metal fitting is attached to the main rubber. A step of obtaining an integrally vulcanized molded product of the main rubber elastic body provided with the main rubber center metal fitting and the main rubber outer metal fitting by vulcanizing and bonding to the outer peripheral portion of the elastic body; By vulcanizing and bonding a membrane outer peripheral fitting provided with a second abutting portion formed with a reinforcing rib to the central portion of the flexible membrane by vulcanizing and bonding to the outer peripheral portion of the flexible membrane, A step of obtaining an integrally vulcanized molded product of the flexible membrane and the buffer rubber, which comprises a metal fitting and a membrane outer peripheral metal fitting, and the buffer rubber is vulcanized and bonded to the second contact portion; Elastic vulcanized molded product, flexible film and buffer In the incompressible fluid, in the incompressible fluid, in the incompressible fluid, the main rubber center bracket and the membrane center bracket are fixed to each other to constitute the first mounting member, The main body rubber outer metal fitting and the membrane outer metal fitting are fixed to each other to form a second mounting member, and a pressure receiving chamber and an equilibrium chamber in which an incompressible fluid is sealed on both sides of the main rubber elastic body are sandwiched. Forming an orifice passage for communicating the two chambers with each other; and (d) providing the first abutment portion and the second attachment member by providing a first abutting portion on the membrane center metal fitting. The first abutting portion and the second abutting portion are spaced apart from each other substantially in the axial direction, and are buffered between the first abutting portion and the second abutting portion. Forming a stopper mechanism provided with rubber, and a fluid-filled vibration isolator In the production method.

  According to such a method of the present invention, since the buffer rubber and the flexible film are integrally assembled, it is not necessary to assemble them separately, so that the manufacturing process can be simplified. In addition, after vulcanization molding of the buffer rubber, flexible membrane, and main rubber elastic body, the vulcanized molded product of the buffer rubber and flexible membrane and the vulcanization molding of the main rubber elastic body are assembled to each other. By configuring one mounting member or the second mounting member, vulcanization molding operations of the buffer rubber, the flexible membrane, and the main rubber elastic body are all facilitated.

  Further, the step of configuring the stopper mechanism (d) is not particularly limited. For example, when the first contact portion and the membrane outer peripheral fitting are integrally formed, the first in the incompressible fluid And a stopper mechanism in which the first contact portion and the second contact portion are opposed to each other and a buffer rubber is provided between the facing surfaces. Is possible. In addition, for example, when the first contact portion and the membrane outer peripheral bracket are formed separately, before the first mounting member and the second mounting member are configured, the first contact portion is previously attached to the membrane outer peripheral bracket. In addition to constituting the stopper mechanism described above in the incompressible fluid, the first attachment member and the second attachment member are configured, and then the first contact portion is placed on the outer periphery of the membrane in the atmosphere. You may comprise the said stopper mechanism by making it fix to a metal fitting and making a 1st contact part and a 2nd contact part oppose.

  As is clear from the above description, in the fluid-filled vibration isolator constructed according to the present invention, the buffer rubber and the flexible film are integrally formed, so that the buffer rubber and the flexible film are formed. In addition to reducing the burden of manufacturing processes and manufacturing costs, including assembly to the mounting member and the second mounting member, for example, when the flexible membrane and the buffer rubber are integrally formed of a material suitable for the characteristics of the flexible membrane In this case, the strength of the second abutting portion and the load resistance performance of the buffer rubber are sufficiently ensured by the outer peripheral portion of the buffer rubber being supported by the reinforcing rib formed on the second abutting portion. Therefore, the target characteristics can be sufficiently secured in the buffer rubber and the flexible film.

Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, FIG. 1 shows an automobile engine mount 10 as an embodiment of the present invention. The engine mount 10 has a structure in which 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 attached to a power unit of an automobile (not shown), while the second mounting bracket 14 is attached to the body of an automobile (not shown), so that the power unit is supported by vibration isolation against the body. ing. Also, under such a mounting state, between the first mounting bracket 12 and the second mounting bracket 14, the shared load of the power unit and the main vibration to be damped are both in the axial direction of the mount 10. (Figure 1,
2, up and down). In the following description, the vertical direction refers to the vertical direction in FIGS.

  More specifically, as shown in FIG. 2, the first mounting member 12 includes a main rubber inner metal member 18 as a main rubber central metal member and a diaphragm inner metal member 20 as a membrane central metal member. In addition, the second mounting bracket 14 is configured to include a main rubber outer cylinder fitting 22 as a main rubber outer circumference fitting and a diaphragm outer cylinder fitting 24 as a membrane outer circumference fitting. The main rubber inner metal fitting 18 and the main rubber outer cylinder fitting 22 are vulcanized and bonded to the main rubber elastic body 16 to form a first integral vulcanized molded product 26, and the diaphragm inner metal fitting 20 and the diaphragm outer cylinder fitting. 24 is vulcanized and bonded to a diaphragm 28 as a flexible film, which will be described later, to form a second integral vulcanized molded product 30, and these first integral vulcanized molded product 26 and the second integral vulcanized molded product 26. Vulcanized products 30 are combined with each other.

  Here, the main rubber inner fitting 18 constituting a part of the first mounting fitting 12 in the first integral vulcanization molded product 26 has a substantially inverted truncated cone shape and is axially (in FIG. 1). , And a screw hole 32 extending at a predetermined depth.

  Further, the main rubber outer cylinder fitting 22 constituting a part of the second mounting fitting 14 in the first integral vulcanization molded product 26 has a large-diameter substantially cylindrical shape, and a radial direction is provided at the lower end portion thereof. A flange-shaped portion 34 that extends outward is integrally formed, and a tapered portion 36 whose diameter is gradually reduced in a conical shape as it goes downward is integrally formed at the upper end portion. As a result, a circumferential groove 38 is formed on the outer peripheral surface of the main rubber outer cylinder member 22 so as to open radially outward and extend in the circumferential direction. The circumferential groove 38 extends in a circumferential direction with a length of a little less than one round, for example, by filling a rubber elastic body integrally formed with the main rubber elastic body 16 at one place on the circumference.

  Further, the main rubber inner metal fitting 18 is disposed on substantially the same central axis so as to be spaced apart above the main rubber outer cylinder fitting 22, so that the tapered outer peripheral surface of the main rubber inner metal fitting 18 and the taper of the main rubber outer cylinder fitting 22 are arranged. The inner peripheral surfaces of the shaped portions 36 are spaced apart from each other and opposed to each other. The main rubber elastic body 16 is disposed between the main rubber inner metal fitting 18 and the main rubber outer cylinder metal fitting 22.

  The main rubber elastic body 16 has a generally frustoconical shape with a large diameter as a whole. The main rubber elastic body 16 is disposed on the same central axis in a state where the main rubber inner metal fitting 18 is inserted and is vulcanized and bonded. In addition, the tapered portion 36 of the main rubber outer tube fitting 22 is overlapped and vulcanized and bonded to the outer peripheral surface of the large-diameter side end portion. Thus, the main rubber elastic body 16 is formed as a first integral vulcanization molded product 26 including the main rubber inner metal fitting 18 and the main rubber outer cylinder metal fitting 20. Further, a mortar-shaped recess 40 that opens downward is formed on the large-diameter side end face of the main rubber elastic body 16, and as a result, between the first mounting bracket 12 and the second mounting bracket 14. When the load is inputted and the main rubber elastic body 16 is elastically deformed, the tensile stress of the main rubber elastic body 16 is reduced.

  Further, a seal rubber layer 42 integrally formed with the main rubber elastic body 16 is formed on the inner peripheral surface of the main rubber outer tube fitting 22 over substantially the whole, and the seal rubber layer 42 is formed on the flange-shaped portion 34. It extends to the lower surface of the. Note that the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body 16 is vulcanized and bonded to the tapered portion 36 of the main rubber outer cylinder fitting 22, so that the main rubber elastic body 16 has an axial direction (in FIG. 1). , Up and down) spring characteristics that are close to a stable linear shape are exhibited.

  Furthermore, a diaphragm 28 is disposed outside the main rubber elastic body 16 in the radial direction. The diaphragm 28 is formed of a thin rubber film and has a substantially annular shape extending in the circumferential direction with a curved cross section having a large slack so that elastic deformation is easily allowed. In addition, a recessed portion 43 that is recessed toward the inside in the radial direction is formed on a part of the circumference of the diaphragm 28.

  Moreover, the diaphragm inner metal fitting 20 which comprises a part of 1st attachment metal fitting 12 in the 2nd integral vulcanization molded product 30 has a substantially disk shape with a small diameter. Further, an insertion hole 44 is provided in the axial direction substantially at the center of the diaphragm inner fitting 20. Furthermore, a mounting plate portion 46 that protrudes upward is integrally formed at a position outside the insertion hole 44 in the diaphragm inner fitting 20, and a mounting hole 48 is perpendicular to the central portion of the mounting plate portion 46. In other words, it extends through the plate thickness direction of the mounting plate portion 46 (left and right in FIG. 1).

  Further, a diaphragm outer cylinder fitting 24 constituting a part of the second mounting bracket 14 in the second integral vulcanized molded product 30 is disposed on substantially the same central axis so as to be separated below the diaphragm inner fitting 20. Yes. The diaphragm outer tube fitting 24 has a thin, substantially large-diameter cylindrical shape, and an annular support portion 50 that extends in a flange shape toward the outer side in the radial direction is integrally formed in an opening above the diaphragm outer tube fitting 24. . Note that fixing bolts 51 project upward from both side portions of the annular support portion 50 that are opposed to each other in one radial direction. Further, an annular stepped portion 52 that spreads radially outward is integrally formed in the lower opening of the diaphragm outer tube fitting 24, and further, on the outer peripheral edge of the stepped portion 52, A substantially annular caulking portion 54 is integrally formed.

  Further, the inner peripheral edge portion of the diaphragm 28 as described above is vulcanized and bonded to the outer peripheral edge portion of the diaphragm inner fitting 20, and the outer peripheral edge portion of the diaphragm 28 is an opening edge above the diaphragm outer tube fitting 24. The part or the inner peripheral edge of the annular support part 50 is vulcanized and bonded. Thus, the diaphragm 28 is formed as a second integrally vulcanized molded product 30 including the diaphragm inner fitting 20 and the diaphragm outer tubular fitting 24. A seal rubber layer 56 that is integrally formed with the diaphragm 28 is formed on the inner peripheral surface of the diaphragm outer tube fitting 24 so as to be attached to the inner periphery of the diaphragm outer tube fitting 24. It extends to the lower surface of the part 52 and is formed.

  Then, the second integral vulcanized molded product 30 is placed on the first integral vulcanized molded product 26 from above, and the lower surface of the diaphragm inner metal fitting 20 is superimposed on the upper surface of the main rubber inner metal fitting 18. The fixing bolt 58 is screwed into the screw hole 32 of the main rubber inner metal fitting 18 through the insertion hole 44 of the diaphragm inner metal fitting 20. In the present embodiment, the main rubber inner fitting 18 is formed with a fitting recess 60 that opens upward in a concave shape, and the diaphragm inner fitting 20 is integrally formed with a fitting projection 62 that protrudes downward. When the main rubber inner metal fitting 18 and the diaphragm inner metal fitting 20 are overlapped with each other, the fitting convex portion 62 is fitted into the fitting concave portion 60, so that the diaphragm inner metal fitting 20 and the main rubber inner metal fitting 18 are axially and circumferentially fitted. Aligned in the direction and arranged on substantially the same central axis. The fitting concave portion 60 and the fitting convex portion 62 have an elliptical shape or a polygonal shape in a plan view, and cannot be relatively displaced in the circumferential direction when being fitted to each other.

  Further, the diaphragm outer cylinder fitting 24 is externally inserted into the main rubber outer cylinder fitting 22 from above. Further, the flange portion 34 of the main rubber outer tube fitting 22 is overlapped in the axial direction with respect to the step portion 52 of the diaphragm outer tube fitting 24 at the lower end portion thereof, and at the upper end portion thereof, the taper portion 36 of the taper portion 36 is formed. The opening edge is overlapped with the inner peripheral surface of the diaphragm outer tube fitting 24 in the radial direction.

  Further, a bottom plate fitting 64 is disposed below the diaphragm outer tube fitting 24. The bottom plate metal fitting 64 has a substantially shallow pan-like disk shape as a whole, and the outer diameter dimension thereof is substantially the same as the outer diameter dimension of the main rubber outer cylinder fitting 22. Further, a through hole 66 is provided in the center portion of the bottom plate metal fitting 64, and a mounting bolt 68 is press-fitted into the through hole 66 and protrudes downward. Further, the bottom of the bottom plate metal fitting 64 is filled with a bottom seal rubber 70, the head of the mounting bolt 68 is embedded in the bottom seal rubber 70, and the gap between the through hole 66 and the mounting bolt 68 is the bottom seal rubber 70. Is closed fluid-tightly.

  The main rubber outer cylinder fitting 22 and the bottom plate fitting 64 are overlapped in the axial direction, and the flange-like portion 34 of the main rubber outer tube fitting 22 is overlapped with the outer peripheral edge of the bottom plate fitting 64 in a close contact state. The caulking portion 54 of the diaphragm outer cylinder fitting 24 is caulked and fixed to the flange-like portion 34, whereby the second mounting fitting 14 comprising the main body rubber outer cylinder fitting 22 and the diaphragm outer cylinder fitting 24 is formed. The first integral vulcanized molded product 26, the second integral vulcanized molded product 30, and the bottom plate metal fitting 64 are assembled to form a mount body 72 as shown in FIGS. As is clear from this, the diaphragm 28 is disposed so as to be spaced outward from the main rubber elastic body 16 so as to cover the entire outer peripheral surface of the main rubber elastic body 16. . Further, the mounting bolt 68 protruding from the bottom plate metal fitting 64 is screwed and fixed to the vehicle body side (not shown), so that the second attachment metal fitting 14 is fixedly attached to the vehicle body via the bottom plate metal fitting 64. It is supposed to be. Incidentally, for example, a press-molded product or the like is suitably used for the main rubber outer tube fitting 22, the diaphragm outer tube fitting 24, the bottom plate fitting 64, and the like.

  Further, the lower opening of the diaphragm outer tube 24 in the mount body 72 is covered fluid-tightly by the bottom plate metal 64, so that an incompressible fluid is interposed between the main rubber elastic body 16 and the bottom plate metal 64. A pressure receiving chamber 74 is formed. A part of the wall of the pressure receiving chamber 74 is constituted by the main rubber elastic body 16, and the elasticity of the main rubber elastic body 16 is applied when vibration is input between the first mounting bracket 12 and the second mounting bracket 14. Based on the deformation, a vibration is input to cause a pressure fluctuation.

  Furthermore, the main rubber elastic body 16 and the diaphragm 28 are fixed to the first mounting bracket 12 and the second mounting bracket 14 at the inner peripheral edge and the outer peripheral edge, respectively, so that the main rubber elastic body 16 and the diaphragm are fixed. 28, an equilibrium chamber 76 filled with an incompressible fluid is formed over the entire circumference on the outer side of the main rubber elastic body 16. That is, the equilibration chamber 76 is configured by the diaphragm 28 whose part of the wall portion is easily deformable, and the volume change is easily allowed based on the elastic deformation of the diaphragm 28. As the incompressible fluid sealed in the pressure receiving chamber 74 or the equilibrium chamber 76, for example, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like can be used, and in particular, a fluid action such as a fluid resonance action described later. In order to obtain a vibration isolation effect based on the above, a low viscosity fluid having a viscosity of 0.1 Pa · s or less is preferably employed. Further, such incompressible fluid is sealed by, for example, assembling the first integrated vulcanized molded product 26, the second integrated vulcanized molded product 30, and the bottom plate metal fitting 64 in the incompressible fluid. This is realized.

  Furthermore, seal rubber layers 42 and 56 integrally formed with the main rubber elastic body 16 or the diaphragm 28 are interposed at the overlapping portions of the main body rubber outer cylinder fitting 22 with the diaphragm outer cylinder fitting 48 at both ends in the axial direction. And is fluid tightly sealed. As a result, the circumferential groove 38 formed in the main rubber outer cylinder fitting 22 is fluid-tightly covered with the diaphragm outer cylinder fitting 24, and therefore, between the radially opposite surfaces of the main rubber outer cylinder fitting 22 and the diaphragm outer cylinder fitting 24. An orifice passage 78 extending in the circumferential direction with a predetermined length (for example, a length of a little less than one round) is formed. In addition, one end in the circumferential direction of the orifice passage 78 is connected to the pressure receiving chamber 74 through a communication hole (not shown) penetrating the cylindrical wall portion of the main rubber outer tube fitting 22 and the other end in the circumferential direction. Is connected to the equilibrium chamber 76 through a communication hole 80 formed in the main rubber elastic body 16.

  Accordingly, a relative pressure fluctuation is induced between the pressure receiving chamber 74 in which the pressure fluctuation is caused and the equilibrium chamber 76 in which the volume change is allowed based on the deformation of the diaphragm 28, thereby causing the pressure receiving pressure. The fluid flow through the orifice passage 78 is generated between the chamber 74 and the equilibrium chamber 76, and the passive vibration-proofing effect based on the resonance action of the fluid that flows through the orifice passage 78 has an axial direction to be vibration-proof. It is designed to be effective against vibrations. In the present embodiment, for example, the resonance frequency of the fluid that can flow through the orifice passage 78 exhibits an effective anti-vibration effect against low-frequency large-amplitude vibration of about 10 Hz such as a shake based on the resonance action of the fluid. Has been tuned to be. Such tuning of the resonance frequency is realized, for example, by changing the setting of the cross-sectional area or length of the orifice passage 78.

  A bracket fitting 82 as a bracket member is fixed to the diaphragm inner fitting 20. The bracket fitting 82 has a rod shape or a plate shape extending in a direction perpendicular to the axis (left and right in FIG. 1), and a plurality of bolt insertion holes 84 are provided at one end (left in FIG. 1) in the direction perpendicular to the axis. A screw hole (not shown in the drawing) is formed at the end of the other axial direction (right in FIG. 1). Then, the bracket fitting 82 is overlaid on the upper surface of the diaphragm inner fitting 20, and the fixing bolt 86 inserted through the mounting plate portion 46 of the diaphragm inner fitting 20 is screwed and fixed to the screw hole at the other end of the bracket fitting 82. As a result, the bracket fitting 82 is fixed to the first mounting fitting 12 and the mount main body 72, while the fixing bolts (not shown) inserted into the plurality of insertion holes 84 at one end of the bracket fitting 82 are provided. The bracket fitting 82 is fixed to the power unit by being screwed and fixed to the power unit side. Thereby, the first mounting member 12 is fixedly attached to the power unit via the bracket member 82.

  In particular, a first abutting portion 88 that is flat in a substantially horizontal direction (left and right in FIG. 1) is formed on the downwardly facing surface (end portion) of the bracket metal member 82 in the middle portion in the direction perpendicular to the axis. When the bracket fitting 82 is assembled to the mount body 72, the first contact portion 88 is opposed to a part of the circumference of the annular support portion 50 of the diaphragm outer tube fitting 24 at a predetermined distance in the axial direction. I'm hurt. In the present embodiment, one end of the first contact portion 88 in the direction perpendicular to the axis (right in FIG. 1) and the depressed portion 43 formed on a part of the circumference of the diaphragm 28 are in the direction perpendicular to the axis. The diaphragms 28 are opposed to each other so that the diaphragm 28 is prevented from extending between the first abutting portion 88 and the axially opposed surfaces of the annular support portion 50 when the diaphragm 28 is elastically deformed. It has become so.

  Further, the diaphragm outer metal fitting 24 is assembled with a rebound stopper metal fitting 90 as a gate-shaped metal fitting. The rebound stopper fitting 90 has substantially the same structure as the rebound stopper fitting previously disclosed by the applicant of the present application in Japanese Patent Application No. 2003-84474, and therefore detailed description thereof will be omitted. It has a shape and includes a pair of leg portions 92 and 92 and a top plate portion 94 extending in a substantially horizontal direction. Further, the rebound stopper fitting 90 has both leg portions 92, 92 overlapped with the annular support portion 50 of the diaphragm outer tube fitting 24, and the fixing bolt 51 is inserted into each leg portion 92, and the tightening nut 96 serves as an annular support portion. Tightened to 50. As a result, the rubber elastic body 16, the diaphragm 28, the first mounting bracket 12, the bracket fitting 82, and the like in which the pair of leg portions 92, 92 of the rebound stopper fitting 90 protrude upward from the second mounting bracket 14 are moved in the radial direction. The rebound stopper fitting 90 is fixed to the mount main body 72 extending in the diaphragm outer tube fitting 24 in a state of straddling in one direction. Further, the rebound stopper metal fitting 90 is assembled in a state where it is separated from the main rubber elastic body 16, the diaphragm 28, the first mounting metal fitting 12, the bracket metal fitting 82, and the like by a predetermined distance, thereby allowing the main rubber elastic body 16 and the diaphragm 28 are assembled to the mount main body 72 so as not to interfere during elastic deformation.

  Further, the top plate portion 94 of the rebound stopper fitting 90 is positioned so as to be opposed to the bracket fitting 82 fixed to the first mounting fitting 12 so as to be spaced upward and the bracket fitting 82 of the top plate portion 94. A rebound stopper rubber 98 as a rebound shock absorbing rubber is attached to the lower surface, which is a surface opposed to the surface, and protrudes toward the bracket fitting 82. Accordingly, when an excessive load is applied in the rebound direction, which is the main vibration input direction of the mount main body 72 and the first mounting bracket 12 and the second mounting bracket 14 are separated from each other, the first The bracket fitting 82 bolted to the attachment fitting 12 is brought into contact with the rebound stopper fitting 90 via the rebound stopper rubber 98, whereby the relative displacement in the separation direction between the first attachment fitting 12 and the second attachment fitting 14 is achieved. The amount is buffered. As is clear from this, the rebound stopper mechanism is attached to the top plate portion 94 of the rebound stopper fitting 90 and the bracket fitting 82 and the top plate portion 94 that are integrally fixed to the first mounting fitting 12. The rebound stopper rubber 98 is included. The main rubber elastic body 16 and the rebound stopper rubber 98 are preferably formed using, for example, natural rubber (NR) in consideration of excellent load resistance and damping performance. .

  In this case, a second contact portion 100 is integrally formed on a part of the circumference of the annular support portion 50 of the diaphragm outer tube fitting 24. The second abutment portion 100 has a substantially planar fan shape, and has substantially the same thickness as the annular support portion 50 of the diaphragm outer tube bracket 24, and is formed from the outer peripheral edge portion of the annular support portion 50. It extends outward in a direction substantially perpendicular to the axis. The second contact portion 100 extends substantially parallel to the first contact portion 88 in the bracket fitting 82 described above, and has a predetermined separation distance in the axial direction from the first contact portion 88. It is made to oppose.

  Further, a bound stopper rubber 102 as a buffer rubber is formed on the upper surface of the second contact portion 100 that is positioned opposite to the first contact portion 88. The bound stopper rubber 102 has a substantially trapezoidal cross-sectional shape and continuously extends over the entire circumference in the circumferential direction of the second abutting portion 100, and the first abutting from the upper surface of the second abutting portion 100. It is fixed to the second contact portion 100 so as to protrude toward the portion 88. Thereby, the bound stopper rubber 102 is opposed to the first contact portion 88 at a predetermined distance in the axial direction.

  Here, the bound stopper rubber 102 is integrally formed with the diaphragm 28 and the seal rubber layer 56 that are vulcanized and bonded to the diaphragm outer tube fitting 24. That is, although not shown in the drawing, the diaphragm outer tube fitting 24 is accommodated and disposed in a predetermined molding die provided with protrusions and grooves that have the outer shape of the bound stopper rubber 102 and the diaphragm 28 inside, and the molding is performed. Since the molding material is filled in the mold and integrally vulcanized and molded, the bound stopper rubber 102 is formed as the second integral vulcanized molded product 30 including the diaphragm 28 and the diaphragm outer tube fitting 24 together with the diaphragm 28 and the like. is there. The molding material for the bound stopper rubber 102 and the diaphragm 28 is not limited in any way, but in this embodiment, a rubber material in which natural rubber and styrene butadiene rubber are mixed in an appropriate blending amount is employed. . As a result, the damping performance and durability of the bound stopper rubber 102 according to the present embodiment and the liquid impermeability, deformability, weather resistance, etc. of the diaphragm 28 are ensured.

  A reinforcing rib 104 is integrally formed on the outer peripheral edge of the second contact portion 100 so as to extend toward the first contact portion 88. It extends continuously over the entire circumference. Accordingly, the base end portion on the outer peripheral side of the bound stopper rubber 102 is attached to the reinforcing rib 104 and supported. Note that the reinforcing rib 104 according to the present embodiment is slightly inclined so as to extend obliquely upward from the second abutting portion 100 outwardly in the radial direction, and is directed toward the first abutting portion 88. The second abutment portion 100 is projected. Further, the height dimension of the reinforcing rib 104 is not particularly limited. For example, the height dimension of the bound stopper rubber 102 is 1/10 to 4/5 times, preferably 1/5 to 1/2 times. Is set.

  Furthermore, a support support portion 106 that extends outward in the radial direction is integrally formed at the protruding tip portion of the reinforcing rib 104. The holding support portion 106 extends in parallel with the second contact portion 100 and is opposed to the first contact portion 88 in the bracket fitting 82 with a predetermined separation distance in the axial direction and includes a reinforcing rib. 104 is formed over the entire circumferential direction. In addition, the transition dimension in the radial direction (left and right in FIG. 1) of the back support part 106 is not limited in any way, but for example, 1/10 to 4/4 of the radial dimension of the second contact part 100 It is set to 5 times, preferably 1/5 to 1/2 times.

  Furthermore, a stopper stopper rubber 108 that is integrally formed with the bound stopper rubber 104 is formed on the upper surface of the holder support portion 106. The storage stopper rubber 108 as a storage buffer rubber has a substantially rectangular cross-sectional shape and is integrally formed by continuously extending the outer peripheral portion of the bound stopper rubber 104 over the entire circumference in the circumferential direction. Further, it is opposed to the first contact portion 88 of the bracket fitting 82 with a predetermined distance in the axial direction. In addition, the protrusion height of the stopper stopper rubber 108 from the stopper support portion 106 is smaller than the protrusion height of the bound stopper rubber 104 from the second contact portion 100. In particular, in the present embodiment, the bound stopper rubber 108 has a protrusion height. The protrusion height of the rubber 104 is set to 4/5 or less, preferably 1/2 or less.

  Therefore, when an excessive load is applied in the bounce direction in the main vibration input direction of the mount main body 72 and in the direction in which the first mounting bracket 12 and the second mounting bracket 14 approach each other, the first mounting bracket is applied. The first abutting portion 88 of the bracket fitting 82 fixedly attached to 12 and the second abutting portion 100 of the second mounting fitting 14 are brought into contact with each other via the bound stopper rubber 102, thereby The relative displacement amount in the approach direction between the mounting bracket 12 and the second mounting bracket 14 is limited in a buffering manner. As apparent from this, the stopper mechanism according to the engine mount 10 for the vehicle of this embodiment includes a first contact portion 88, a second contact portion 100, and a bound stopper rubber 102. It is configured as a mechanism. In the present embodiment, it is also clear from the above description that the stopper mechanism is formed by a part of the circumference of the mount body 72.

  Further, particularly in the present embodiment, when a larger load is input between the first mounting bracket 12 and the second mounting bracket 14 in the direction in which both the brackets 12 and 14 approach each other, the first abutment The bound stopper rubber 102 interposed between the portion 88 and the second abutting portion 100 is compressed and deformed, and the holding support portion 106 formed integrally with the second abutting portion 100 serves as the bound stopper rubber 102. The bounce stopper rubber 102 attached to the second abutting portion 100 is brought into contact with the first abutting portion 88 of the bracket fitting 82 via the stopper stopper rubber 108 integrally formed with the second abutting portion. The pressure receiving area with respect to the first abutting portion 88 is increased, and a buffering limiting action on the relative displacement amount in the approach direction of the first and second mounting brackets 12 and 14 is more advantageously exhibited. Have .

  In the automobile engine mount 10 having such a structure, the diaphragm 28 and the bound stopper rubber 102 are integrally formed, so that, for example, the following mount manufacturing method can be employed. Of course, the engine mount 10 according to the present embodiment is not limited to the manufacturing method.

  First, by integrally vulcanizing and molding the main rubber elastic body 16 together with the main rubber inner metal fitting 18 and the main rubber outer cylinder metal fitting 22, the first integral of the main rubber elastic body 16 including the main rubber inner metal fitting and the outer cylindrical metal fittings 18 and 22 is obtained. A vulcanized product 26 is prepared. In addition, a bottom plate fitting 64 to which the mounting bolt 68 is fixed and a bracket fitting 82 having the first contact portion 88 are separately prepared.

  Further, the diaphragm 28, the bound stopper rubber 102, and the stopper stopper rubber 108 are integrated together with the diaphragm outer tube fitting 24 and the diaphragm inner fitting 20 provided with the second abutment portion 100 in which the reinforcing rib 104 and the stopper support portion 106 are integrally formed. By performing vulcanization molding, the diaphragm inner fitting 20 and the diaphragm outer tube fitting 24 are provided, and further, the bound stopper rubber 102 and the stopper stopper rubber 108 are vulcanized and bonded to the second contact portion 100 and the stopper support portion 106. At the same time, the second integral vulcanized molded product 30 of the diaphragm 28, the bound stopper rubber 102, and the stopper stopper rubber 108 in which the base end portion on the outer peripheral side of the bound stopper rubber 102 is vulcanized and bonded to the reinforcing rib 104 is obtained.

  Further, the first integral vulcanized molded product 26 and the second integral vulcanized molded product 30 are immersed in an incompressible fluid and held by a jig or the like (not shown), and the fitting convex portion 62 of the diaphragm inner metal fitting 20 is formed. The first mounting bracket 12 is configured by fitting into the fitting recess 60 of the main rubber inner metal fitting 18 and screwing and fixing the fixing bolt 58 into the screw hole 32. On the other hand, the main rubber outer cylinder fitting 22 is fitted into the diaphragm outer cylinder fitting 24, the flange-like portion 34 of the main rubber outer cylinder fitting 22 is overlapped with the stepped portion 52 of the diaphragm outer cylinder fitting 24, and the bottom plate fitting 64 is further joined to the diaphragm outer cylinder fitting. 24, the outer peripheral edge of the bottom plate metal fitting 64 is overlapped with the flange-like portion 34 of the main rubber outer cylinder fitting 22, and then the diaphragm outer cylinder fitting 24 is subjected to a drawing process in the radial direction as needed. The second mounting bracket 14 is configured by caulking the caulking portion 54 of the outer cylinder bracket 24. As a result, a pressure-receiving chamber 74 and an equilibrium chamber 76 in which an incompressible fluid is sealed are formed on both sides of the main rubber elastic body 16 between the diaphragm 28 and the bottom plate metal fitting 64 in a fluid-tight manner. At the same time, the mount main body 72 is formed with an orifice passage 78 in which the circumferential groove 38 of the main rubber outer tubular fitting 22 and the cylindrical wall portion of the diaphragm outer tubular fitting 24 cooperate to communicate the pressure receiving chamber 74 and the equilibrium chamber 76 with each other. Get.

  Furthermore, the mount main body 72 is taken out from the incompressible fluid, and the bracket fitting 82 is superimposed on the upper surface of the first attachment fitting 12 in the atmosphere, and the fixing bolt 86 is bracketed through the attachment hole 48 of the attachment plate portion 46. The bracket fitting 82 is fixed to the mount body 72 by being screwed and fixed to a screw hole (not shown) of the fitting 82. Accordingly, the bound stopper rubber 102 attached to the first contact portion 88 and the second contact portion 100 of the bracket metal member 82 and the stopper stopper rubber 108 attached to the reservation support portion 106 are predetermined in the axial direction. A bound stopper mechanism that is opposed to each other at a distance is configured.

  Further, the top plate portion 94 of the rebound stopper metal fitting 90 is secured by fixing the rebound stopper metal fitting 90 to the diaphragm outer tube fitting 24 using a pair of tightening nuts 96, 96 and fixing bolts 51, 51 in the atmosphere. The bracket fitting 82 fixed to the upper surface of the first mounting fitting 12 constitutes a rebound stopper mechanism in which the bracket fitting 82 is opposed to each other at a predetermined distance in the axial direction. Thereby, the engine mount 10 for automobiles of this embodiment is implement | achieved.

  Therefore, in the automobile engine mount 10 having the above-described structure, the diaphragm 28 and the bound stopper rubber 102 are integrally formed, so that it is not necessary to vulcanize them separately and assemble them to the mount body 72. As a result, the manufacturing process and the number of parts can be reduced, so that excellent cost performance can be exhibited.

  Further, in the present embodiment, the bound stopper rubber 102, the retaining stopper rubber 108, and the diaphragm 28 are made of a rubber material in which styrene butadiene rubber is mixed with natural rubber. The required properties such as liquid impermeability, ease of deformation, weather resistance, etc. are ensured, and the durability, damping properties, etc. required for the bound stopper rubber 102 and the reserve stopper rubber 108 based on the physical properties of natural rubber. Since the characteristics are ensured, the high-quality mount 10 can be realized.

  Moreover, in addition to the strength of the second abutting portion 100 being increased by integrally forming the second abutting portion 100 with the reinforcing rib 104 that rises substantially in the axial direction, The outer peripheral portion including the base end portion on the outer peripheral side is vulcanized and bonded to the reinforcing rib 104, and the stopper stopper rubber 108 formed integrally with the outer peripheral portion of the bound stopper rubber 102 is radially outward of the reinforcing rib 104. Since the pressure receiving area of the bound stopper rubber 102 is ensured as a whole by being vulcanized and bonded to the extending support portion 106, the first contact portion 88, the second contact portion 100, the bound The load resistance performance of the bound stopper mechanism made of the stopper rubber 102 can be advantageously exhibited.

  Further, when a crack is generated in the bound stopper rubber 102 or the stopper stopper rubber 108, the end of the crack is defined by the reinforcing rib 104, thereby reducing or avoiding the crack from spreading in the direction perpendicular to the axis. The advantage that it is done also arises.

  The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention is not limited to a specific description in the embodiment, and is based on the knowledge of those skilled in the art. The present invention can be implemented with various changes, modifications, improvements, and the like, and any such embodiments are included in the scope of the present invention without departing from the spirit of the present invention. Needless to say.

  For example, although the rebound stopper mechanism provided with the rebound stopper metal fitting 90 and the rebound stopper rubber | gum 98 was provided, this mechanism is arrange | positioned as needed and is not essential.

  Further, in the above-described embodiment, the shock absorbing rubber attached to the second contact portion 100 is used as the bound stopper rubber 102, and includes the first contact portion 88 that is spaced upward and opposed. Although the bound stopper mechanism is configured, the present invention is not limited to this. For example, the first abutting portion fixed to the first mounting bracket 12 is spaced below and opposed to the second abutting portion, and the reinforcing rib and the buffer rubber are separated from the second abutting portion. By providing the first abutting portion so as to extend downward, it is possible to configure the rebound stopper mechanism in cooperation with the first and second abutting portions by using the cushion rubber as a rebound stopper rubber. is there.

  Furthermore, in the said embodiment, although the 1st contact part 88 was formed in the bracket metal fitting 82 formed separately from the 1st attachment metal fitting 12, it is integrally formed in the 1st attachment metal fitting 12, and a shaft. You may comprise by the protrusion piece which protrudes at right angle direction outward.

  Furthermore, the shape, size, structure, etc. of the bracket fitting 82 are not limited in any way. For example, the bracket fitting 82 may be formed so as to cover the outer surface of the diaphragm. It may also be provided with a function as a protective cover for protecting the diaphragm 28 from radiant heat from the vehicle and foreign matter splashed up while the automobile is running.

  Further, the shape and size of the orifice passage 78, the structure including the tuning frequency, the number, and the like are not particularly limited, and can be appropriately set and changed according to the target vibration-proof effect.

  Further, in the engine mount 10 according to the above-described embodiment, various known mechanisms can be appropriately added according to the required anti-vibration characteristics, for example, as shown in FIG. In addition, a substantially disc-shaped vibration plate 110 is disposed in place of the bottom plate metal fitting 64 in the lower opening portion of the diaphragm outer tube metal fitting 24 that constitutes a part of the second mounting metal fitting 14, and the vibration plate The outer peripheral edge of 110 is elastically coupled and supported to an annular support fitting 114 fixed by caulking to the diaphragm outer tube fitting 24 via an annular plate-like support rubber elastic body 112, while the diaphragm outer tube fitting 24 is Below, for example, an electromagnetic actuator as disclosed in Japanese Patent Laid-Open No. 2003-14033, Japanese Patent Laid-Open No. 2003-49894, etc. A known actuator 116 such as a pneumatic actuator as disclosed in Japanese Patent Laid-Open No. 2002-235798 is disposed, and the actuator 116 vibrates the vibration plate 110 in the direction of the mount center axis (up and down in FIG. 4). It is also possible to provide an active vibration isolation mechanism by driving. A partition plate bracket 118 is disposed between the opposing surfaces of the main rubber elastic body 16 and the vibration plate 110, and the outer peripheral edge thereof is caulking force between the main rubber outer tube bracket 22 and the annular support bracket 114. Thus, the pressure receiving chamber 74 is partitioned into the working chamber 120 and the excitation chamber 122. The working chamber 120 and the excitation chamber 122 communicate with each other through a communication passage 124 penetrating the partition plate 118, and the pressure generated in the excitation chamber 122 by the excitation drive of the excitation plate 110. The fluctuation is transmitted to the working chamber 120 through the communication path 124. Further, the actuator 116 has a second flange-shaped portion 128 formed integrally with the peripheral edge of the opening of the bottomed cylindrical housing 126 by the caulking process of the caulking portion 54 of the diaphragm outer tube fitting 24, thereby The mounting bracket 14 is attached.

  In the engine mount of the above specific example, the vibration of the vibration receiving plate 74 is positively controlled by controlling the vibration of the vibration plate 110 with the frequency and phase corresponding to the input vibration in the active vibration isolation mechanism. Since the anti-vibration performance can be adjusted by controlling, it is possible to obtain a more effective anti-vibration effect against vibrations in a wider frequency range. In FIG. 4, in order to facilitate understanding of this specific example, members and parts having the same structure as the above-described embodiment will be described in detail by attaching the same reference numerals in the drawing. Is omitted.

  In addition, in the above-described embodiments, specific examples of the present invention applied to an engine mount of an automobile have been described. However, the present invention is not limited to a body mount, a differential mount, and a suspension bush, and is also a vibration isolator for various vibrators other than an automobile. However, it goes without saying that both are applicable.

It is a partially broken side view showing an automobile engine mount as one embodiment of the present invention. FIG. 4 is a longitudinal cross-sectional explanatory view showing a mount main body that constitutes a part of the automobile engine mount in FIG. 1, corresponding to a III-III cross section in FIG. FIG. 3 is an explanatory plan view showing a mount body in FIG. 2. FIG. 5 is a longitudinal cross-sectional explanatory view showing a mount main body constituting a part of an automobile engine mount as another specific example of the present invention, corresponding to FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Automotive engine mount 12 1st attachment metal fitting 14 2nd attachment metal fitting 16 Main body rubber elastic body 18 Main body rubber inner metal fitting 20 Diaphragm inner metal fitting 22 Main body rubber outer cylinder metal fitting 24 Diaphragm outer cylinder metal fitting 28 Diaphragm 74 Pressure receiving chamber 76 Equilibrium room 78 Orifice Passage 88 First contact portion 100 Second contact portion 102 Bound stopper rubber 104 Reinforcing rib

Claims (6)

A main body rubber central bracket is bonded to the central portion of the main rubber elastic body constituting a part of the wall portion of the pressure receiving chamber where the incompressible fluid is sealed and vibration is input, and the main body is attached to the outer peripheral portion of the main rubber elastic body. While adhering the rubber outer peripheral fitting, the membrane central fitting is adhered to the central portion of the flexible membrane disposed so as to cover the outside of the main rubber elastic body, and the membrane outer peripheral fitting is attached to the outer peripheral portion of the flexible membrane. To form a first mounting member that is attached to one member to be vibration-proof connected by fixing the main rubber center bracket and the membrane central bracket to each other, and the main rubber outer bracket and the membrane A second mounting member that is attached to the other member that is vibration-proofed by fixing the outer peripheral metal members to each other is formed, and a wall is formed of the flexible film on the opposite side of the pressure receiving chamber with the main rubber elastic body interposed therebetween. Part of the chamber is filled with an incompressible fluid Forming an orifice passage that allows the pressure receiving chamber and the equilibrium chamber to communicate with each other, and further providing a first contact portion that extends outward in a direction substantially perpendicular to the axis on the first mounting member, and The second mounting member is provided with a second abutting portion extending outward in a direction substantially perpendicular to the axis, and the first abutting portion and the second abutting portion are separated from each other in the substantially axial direction and are opposed to each other. In the fluid-filled vibration isolator configured as a stopper mechanism by providing cushioning rubber between the first contact portion and the second contact portion,
The buffer rubber is integrally formed with the flexible film and fixed to the second contact portion, and protrudes toward the first contact portion at the outer peripheral edge of the second contact portion. A fluid-filled vibration isolator comprising a reinforcing rib and an outer peripheral portion of the buffer rubber supported by the reinforcing rib.   A bracket member attached to one of the vibration-proof connected members is fixed to the first attachment member, and is disposed so as to extend from a part of the circumference of the first attachment member in a direction substantially perpendicular to the axis. Accordingly, the bracket member is configured to include the first abutting portion, and the second abutting portion to which the buffer rubber is fixed is partially disposed on the circumference of the second mounting member. The fluid filled type vibration damping device according to claim 1, wherein the fluid filled type vibration damping device is provided at a position opposite to the bracket member in a substantially axial direction.   The fluid-filled vibration isolator according to claim 1 or 2, wherein the flexible film and the buffer rubber are integrally formed using a synthetic rubber or a rubber material made of a synthetic rubber mixed with natural rubber.   A reinforcing support portion that extends in a direction substantially perpendicular to the axis from the protruding tip portion of the reinforcing rib toward the outer peripheral side is integrally formed, and the buffer rubber has a substantially trapezoidal cross-sectional shape, and protrudes lower than the buffer rubber from the outer peripheral surface. 4. The fluid-filled type vibration damping device according to claim 1, wherein a storage buffer rubber that extends outwardly on the storage support portion at a height is integrally formed.   A gate-shaped bracket extending across the first mounting member is disposed across the radially opposing portions of the second mounting member, and rebounded between the gate-shaped bracket and the first mounting member. By providing a shock absorbing rubber, the first mounting member and the second mounting member are separated from each other on the basis that the gate-shaped bracket and the first mounting member are brought into contact with each other through the rebound shock absorbing rubber. The fluid-filled vibration isolator according to any one of claims 1 to 4, wherein a rebound stopper mechanism configured to limit the amount of displacement in the direction in which the fluid is displaced is buffered. The body rubber center bracket and body rubber outer bracket are provided by vulcanizing and bonding the body rubber center bracket to the center of the body rubber elastic body and by vulcanizing and bonding the body rubber outer bracket to the outer periphery of the body rubber elastic body. Obtaining an integrally vulcanized molded product of the main rubber elastic body;
The membrane center bracket is vulcanized and bonded to the central portion of the flexible membrane, and the membrane outer peripheral bracket provided with the second contact portion formed with the reinforcing rib is vulcanized and bonded to the outer peripheral portion of the flexible membrane. A step of obtaining an integral vulcanized molded product of the flexible membrane having the membrane center metal fitting and the membrane outer circumference metal fitting, and having the buffer rubber vulcanized and bonded to the second contact portion, and the buffer rubber;
An integral vulcanized molded product of the main rubber elastic body and an integral vulcanized molded product of the flexible membrane and the buffer rubber are immersed in an incompressible fluid, and the main rubber center bracket is immersed in the incompressible fluid. And the membrane center bracket are fixed to each other to form a first mounting member, and the main body rubber outer peripheral bracket and the membrane outer peripheral bracket are fixed to each other to configure a second mounting member, Forming a pressure receiving chamber in which an incompressible fluid is sealed on both sides of the elastic body and an equilibrium chamber, and forming an orifice passage for communicating the two chambers;
When forming the first attachment member and the second attachment member by providing the membrane center metal fitting with a first contact portion, the first contact portion and the second contact portion are substantially aligned with each other. A step of forming a stopper mechanism in which a buffer rubber is provided between the first contact portion and the second contact portion while being spaced apart in the direction and facing each other.
A method for manufacturing a fluid filled type vibration damping device, comprising:

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