JP6351476B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator that is applied to, for example, an engine mount of an automobile.

  Conventionally, an anti-vibration device is known as a type of anti-vibration coupling body or anti-vibration support body that is disposed between members constituting a vibration transmission system and elastically connects these members to each other. It has been applied to engine mounts and so on. As shown in, for example, Japanese Patent Application Laid-Open No. 2005-240926 (Patent Document 1), the vibration isolator includes a first attachment member attached to one member constituting a vibration transmission system, and a vibration transmission system. And a second attachment member attached to the other member constituting the structure is elastically connected to each other by a main rubber elastic body.

  Incidentally, in the vibration isolator of Patent Document 1, both the first mounting member and the second mounting member are vulcanized and bonded to the main rubber elastic body. That is, in Patent Document 1, the main rubber elastic body is vulcanized by a mold in which the first mounting member and the second mounting member are set, so that the first mounting member and the second mounting member are formed. It is formed as an integral vulcanized molded product.

  However, if the first mounting member and the second mounting member are directly vulcanized and bonded to the main rubber elastic body, the number of main rubber elastic bodies that can be molded at once to set a large member on the mold There is a risk that the production efficiency of the main rubber elastic body will be reduced. In addition, when the first mounting member and the second mounting member are vulcanized and bonded to the main rubber elastic body, the first mounting member and the second mounting member are elastic to the main rubber rubber for the purpose of rust prevention or the like. In some cases, post-coating may be required after vulcanization molding of the body. In addition to the need for a painting process and a drying process after painting, in order to prevent adverse effects on the main rubber elastic body due to painting, There is a possibility that a long time is required for the drying process.

  Therefore, the applicant has proposed a vibration isolator in which the main rubber elastic body is attached to the second attachment member in a non-adhesive manner in Japanese Patent No. 4120372 (Patent Document 2). In the vibration isolator of Patent Document 2, the base rubber elastic body is attached to the second mounting member in a non-adhering manner by sandwiching the base of the main rubber elastic body by the second mounting member.

  However, in the structure of Patent Document 2, since the main rubber elastic body is sandwiched by the second mounting member only on both sides where the pair of first locking pieces are provided, depending on the magnitude of the input load, etc. In some cases, the main rubber elastic body is not sufficiently held by the second mounting member, and there has been a demand for a mounting structure that enables a stronger holding.

JP-A-2005-240926 Japanese Patent No. 4120372

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is a vibration isolator having a novel structure in which the main rubber elastic body is firmly attached to the second attachment member without adhesion. It is to provide.

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

  That is, according to the first aspect of the present invention, the first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and the main rubber elastic body is not bonded to the second mounting member. The main rubber elastic body includes a pair of leg portions extending from the first attachment member, and the second end portion of the pair of leg portions is provided with the second end portion. A base metal part constituting the mounting member is overlaid, and a convex part provided on the base metal part is inserted between the pair of leg parts, and is superimposed on each facing surface of the pair of leg parts. On the other hand, a clamped portion extending on the base metal fitting is formed at the extended end of each leg, and the clamp metal fitting constituting the second mounting member in cooperation with the base metal fitting is It is overlapped with the base metal fitting and fixed by caulking. And the outer periphery of the extending end portion of each leg portion provided with the sandwiched portion, with the portion being sandwiched in the overlapping direction between the base metal fitting and the clamping metal fixture over the entire length in the circumferential direction of each leg portion. The surface is superimposed on the second mounting member over the entire circumference.

  According to the vibration isolator having the structure according to the first aspect as described above, the sandwiched portion of the main rubber elastic body is sandwiched between the base metal fitting and the holding metal fitting constituting the second mounting member. The main rubber elastic body is attached to the second attachment member without bonding. Therefore, even when a large second mounting member is adopted, it is not necessary to secure a large mold cavity to set the second mounting member when molding the main rubber elastic body, and the main rubber elasticity The body can be manufactured efficiently. In addition, the process for bonding the main rubber elastic body to the second mounting member can be omitted, and the number of manufacturing processes can be reduced.

  Furthermore, since the outer peripheral surface is overlapped with the second mounting member over the entire circumference, the extended end portions where the sandwiched portions are provided in the pair of leg portions of the main rubber elastic body are arranged to the outer peripheral side. The amount of elastic deformation is limited by contact with the second mounting member. Therefore, the amount of compressive deformation of the clamped portion is limited in the overlapping direction of the base metal fitting and the clamp metal fitting, and the spring constant of the clamped portion with respect to compression between the metal fittings is increased. Thus, the main rubber elastic body is firmly attached to the second attachment member in a non-adhesive manner.

  In addition, the sandwiched portion is sandwiched between the base bracket and the clamp bracket over the entire length in the circumferential direction of the leg portion, so that a wide area is secured between the base bracket and the clamp bracket in the clamped portion. Thus, strong attachment of the main rubber elastic body to the second attachment member is realized. Furthermore, the amount of elastic deformation of the sandwiched portion is also limited in the overlapping direction of the base metal fitting and the clamp metal fitting, so that the sandwiched portion is more firmly held by the base metal fitting and the clamp metal fitting.

  According to a second aspect of the present invention, in the vibration isolator having the structure according to the first aspect, the holding metal fitting includes a cylindrical portion surrounding the main rubber elastic body.

  According to the second aspect, since the periphery of the main rubber elastic body is covered with the cylindrical portion, the main rubber elastic body is protected by the cylindrical portion, and the durability is improved. In addition, since the deformation amount of the main rubber elastic body to the outer periphery is limited by the contact with the cylindrical portion, the durability of the main rubber elastic body can be improved.

  According to a third aspect of the present invention, in the vibration isolator described in the second aspect, the first attachment member includes a stopper plate portion, and the cylindrical portion protrudes toward the inner peripheral side. An inner flange portion is provided, the inner flange portion is disposed opposite to the base metal plate with respect to the stopper plate portion, and a relative displacement amount between the first mounting member and the base metal member is set in a separation direction. The displacement restricting means to be limited by is constituted by the contact of the stopper plate portion and the inner flange portion.

  According to the third aspect, since the displacement restricting means is configured by the contact between the stopper plate portion and the inner flange portion, the boundary portion between the pair of leg portions and each sandwiched portion is cracked against a large tensile input. Inconveniences such as the occurrence of this are avoided, and the durability is improved. Furthermore, when a large tensile load is input, the first mounting member and the main rubber elastic body can be prevented from separating from the second mounting member by the displacement restricting means, and the main rubber elastic body can be connected to the second mounting member. The mounting state is maintained.

  In addition, due to the contact between the stopper plate portion and the cylindrical portion, the amount of relative displacement of the first mounting member to the outer periphery with respect to the second mounting member is more advantageously limited, thereby improving durability.

  According to a fourth aspect of the present invention, in the vibration isolator described in any one of the first to third aspects, the tip of the convex portion inserted between the pair of leg portions is the sandwiched portion. Is located on the first mounting member side with respect to the overlapping surface on the holding metal fitting.

  According to the fourth aspect, the extension end portions of the pair of leg portions are effectively limited in the elastic deformation amount on the respective opposing surfaces by the contact of the convex portions having large projecting dimensions, and the main rubber elastic body Is firmly attached to the second attachment member.

  According to a fifth aspect of the present invention, in the vibration isolator described in any one of the first to fourth aspects, the base bracket of the second mounting member and the pair of legs of the main rubber elastic body. Positioning means for relatively positioning the base metal fitting and the main rubber elastic body is provided between the parts.

  According to the fifth aspect, when the main rubber elastic body is set non-adhered to the base metal fitting and then the clamping metal fitting is caulked and fixed to the base metal fitting, the pair of legs are positioned by the positioning means with respect to the base metal fitting. Thus, the sandwiched portion of the main rubber elastic body can be sandwiched between the base metal fitting and the sandwiching member at the correct position.

  According to a sixth aspect of the present invention, in the vibration isolator described in any one of the first to fifth aspects, an overlapping surface of the sandwiched portion with the sandwiched metal fitting includes the base metal fitting and the sandwiched article. With respect to the overlapping direction of the metal fittings, it spreads more greatly than the extension of the outer peripheral surface of the leg portion.

  According to the sixth aspect, the sandwiched portion can be strongly sandwiched between the base bracket and the sandwiching bracket, and the sandwiched portion is sandwiched between the second mounting members, so that the spring characteristics of the pair of leg portions Thus, the desired anti-vibration characteristics can be effectively obtained while realizing a strong attachment between the main rubber elastic body and the second attachment member.

  According to a seventh aspect of the present invention, in the vibration isolator described in any one of the first to sixth aspects, a separate fastening member attached to the anti-vibration connection target member is the first attachment member. It is designed to be fixed later.

  According to the seventh aspect, since the fastening member is separately fixed from the first mounting member and is rear-fixed, the first mounting member is downsized, and the first mounting member is Even when vulcanized and bonded to the main rubber elastic body, the main rubber elastic body can be efficiently molded.

  According to the present invention, the second mounting member has a structure in which the base metal fitting and the holding metal fitting are overlapped and fixed by caulking, and the sandwiched portion of the main rubber elastic body is held between the base metal fitting and the holding metal fitting as a whole. Therefore, the main rubber elastic body is firmly held by the second mounting member. Furthermore, the extended end portions of the pair of leg portions provided with the sandwiched portion are overlapped with the second mounting member over the entire circumference, and the elastic deformation to the outer peripheral side of the sandwiched portion is the second mounting. Since it is limited by the member, the sandwiched portion is sandwiched between the base metal fitting and the metal fitting with a sufficient reaction force, and the main rubber elastic body is more firmly attached to the second attachment member.

The perspective view which shows the engine mount as 1st embodiment of this invention in the state in which the fastening member was attached. The top view of the engine mount with a fastening member shown in FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. VV sectional drawing of FIG. The perspective view of the integral vulcanization molded product which comprises the engine mount shown in FIG. The top view of the integral vulcanization molded product shown in FIG. The front view of the integral vulcanization molded product shown in FIG. The perspective view of the 1st attachment member which comprises the integral vulcanization molded product shown in FIG. The perspective view of the base metal fixture which comprises the engine mount shown in FIG. The top view of the base metal fitting shown in FIG. The front view of the base metal fitting shown in FIG. The left view of the base metal fitting shown in FIG. FIG. 2 is a perspective view of a holding metal fitting constituting the engine mount shown in FIG. 1. The top view of the clamping metal fitting shown in FIG. The front view of the clamping metal fitting shown in FIG. The left view of the clamping metal fitting shown in FIG. The perspective view explaining the assembly process of the engine mount shown in FIG.

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

  1 to 5 show an engine mount 10 for an automobile as a first embodiment of a vibration isolator having a structure according to the present invention. The engine mount 10 includes an integrally vulcanized molded product 16 (FIGS. 6 to 8) of a main rubber elastic body 14 provided with a first attachment member 12 attached to a second attachment member 18 in a non-adhesive manner. The mounting member 12 and the second mounting member 18 are elastically connected to each other by the main rubber elastic body 14. In the following description, in principle, the vertical direction means the vertical direction in FIG. 3, the front-back direction means the vertical direction in FIG. 2, and the horizontal direction means the horizontal direction in FIG.

  More specifically, the first mounting member 12 includes a shaft member 20 as shown in FIGS. The shaft member 20 is a high-rigidity member formed of iron, aluminum alloy, fiber-reinforced synthetic resin, etc., has a small-diameter, generally cylindrical shape, and extends on the central axis and opens on the upper surface. Screw holes 22 are provided. Further, a stopper plate portion 24 is attached to the shaft member 20. The stopper plate portion 24 has a substantially rounded rectangular plate shape as a whole, and the shaft member 20 is inserted into a mounting hole penetrating the center up and down and fixed by means such as welding. Extends from the lower part to the outer peripheral side in a direction substantially perpendicular to the axis. The stopper plate portion 24 of the present embodiment has an inclined shape in which the middle portion gradually inclines upward toward the left and right outwards on both the left and right sides, and the end portion inclines downward toward the left and right outwards. Is bent.

  Further, a main rubber elastic body 14 is vulcanized and bonded to the first mounting member 12, and the main rubber elastic body 14 is formed as an integrally vulcanized molded product 16 including the first mounting member 12. (See FIGS. 6-8). As shown in FIGS. 3 and 6 to 8, the main rubber elastic body 14 includes a fixing portion 26 that spreads to the left and right and is fixed to the first mounting member 12. The fixing portion 26 is provided so as to cover the lower portion of the shaft member 20 and the surface of the stopper plate portion 24, and a portion of the fixing portion 26 covering from the outer peripheral surface to the upper surface of the stopper plate portion 24 is formed with the thick stopper rubber 28. Has been. The stopper rubber 28 of the present embodiment is formed with a plurality of buffer protrusions 30 extending in the front-rear direction.

  Further, the main rubber elastic body 14 includes a pair of leg portions 32 a and 32 b extending downward from the first mounting member 12. The pair of leg portions 32a and 32b are integrally formed at the left and right end portions of the fixing portion 26 that covers the lower surface of the stopper plate portion 24, are spaced apart from each other in the left-right direction, and each downward. Inclined outwards so as to open left and right. In addition, in the lower surfaces of the pair of leg portions 32a and 32b, recesses 34 for accommodating the heads of mounting bolts 66 to be described later are formed as openings. Furthermore, in this embodiment, the concave groove 36 opened in the lower surface of a pair of leg part 32a, 32b is formed extending continuously over the front and back full length, and is connected to the recess 34 in the intermediate part. . In the present embodiment, positioning convex portions 40 project from the opposing surfaces 38, 38 of the pair of leg portions 32a, 32b at the center portion in the front-rear direction.

  Furthermore, a sandwiched portion 42 is formed integrally with the lower ends of the pair of leg portions 32a and 32b, respectively. 6-8, the to-be-clamped part 42 is each formed in each outer peripheral surface except the opposing surfaces 38 and 38 of a pair of leg part 32a, 32b over the perimeter, respectively, and has predetermined | prescribed up-down dimension. It has a flange shape and protrudes toward the outer periphery. Each leg portion 32 has a substantially rectangular cross-sectional shape, and a sandwiched portion 42 is provided at the lower end portion so as to continuously extend in the circumferential direction on three sides excluding the side portion on the facing surface 38 side. Yes. The sandwiched portion 42 of the present embodiment has a planar shape in which the upper surface 44 and the lower surface 46 extend in a direction substantially orthogonal to the vertical direction and extend in parallel to each other, and the outer peripheral surface 48 extends in a direction substantially parallel to the vertical direction. Are continuously combined in the circumferential direction on the curved surface of each corner portion. Further, as shown in FIG. 8, the upper surface 44 of the sandwiched portion 42 is a portion where the sandwiched portion 42 is formed in the leg portion 32 with respect to the overlapping direction (vertical direction) of the base bracket 50 and the sandwiched bracket 52 described later. It extends with a greater inclination than the extension of the outer peripheral surface. In short, the angle (α) formed between the upper surface 44 of the sandwiched portion 42 and the vertical direction, which is the sandwiching direction of the sandwiched portion 42 described later, is an extension of the outer peripheral surface of the leg portion 32 that is out of the formation site of the sandwiched portion 42. It is made larger than the angle (β) formed with the vertical direction. The concave groove 36 is also formed so as to extend continuously to the sandwiched portion 42, and an end portion in the length direction opens to the outer peripheral surface of the sandwiched portion 42.

  A second attachment member 18 is attached to the main rubber elastic body 14. The second mounting member 18 is a highly rigid member formed of a metal material such as iron or aluminum alloy, and includes a base metal fitting 50 and a holding metal fitting 52.

  As shown in FIGS. 10 to 13, the base metal fitting 50 is a generally rectangular plate-shaped member obtained by pressing a plate material or the like, and a convex portion 54 is provided at the center in the left-right direction. ing. The convex portion 54 extends in the front-rear direction with a curved section that is convex upward, and has a flat plate shape in which a left and right central portion serving as a protruding tip portion extends substantially orthogonally in the vertical direction. Furthermore, an air hole 56 is formed in the protruding tip portion of the convex portion 54 so as to penetrate vertically. Furthermore, positioning concave portions 58 are formed in the left and right end portions of the convex portion 54 so as to be recessed leftward and rightward in the front and rear central portions.

  Further, the base metal fitting 50 is provided with receiving portions 60a and 60b. The receiving portions 60a and 60b are integrally formed on each of the left and right sides of the convex portion 54, and are formed in a plate shape that extends substantially orthogonal to the vertical direction. Three caulking pieces 64, 64, 64 extending upward are integrally formed. Further, mounting bolts 66 penetrating vertically and extending downward are respectively implanted in the receiving portions 60a and 60b, and the heads of the mounting bolts 66 project from the upper surfaces of the receiving portions 60a and 60b. .

  The holding metal fitting 52 is a member obtained by, for example, pressing a plate material in the same manner as the base metal fitting 50, and as shown in FIGS. More specifically, the sandwiching fitting 52 includes a substantially rectangular tubular portion 68, and a sandwiching portion 70 is integrally formed at the lower end of the tubular portion 68. The clamping part 70 protrudes from the lower end of the cylindrical part 68 to the outer peripheral side, and is provided on each of the left and right side parts of the cylindrical part 68. Further, a side restraint portion 72 that extends downward from the projecting tip is integrally formed on the sandwiching portion 70 over the entire circumferential direction, whereby the sandwiching portion 70 and the tubular portion 68 and the side restraint portion 72 are formed. Are provided in steps. Furthermore, a caulking portion 74 protruding to the outer peripheral side is integrally formed at the lower end of the side restraint portion 72 over the entire circumferential direction. On the other hand, an inner flange portion 76 projecting toward the inner peripheral side is integrally formed at the upper end of the cylindrical portion 68, and is formed with a projecting dimension larger in the left-right direction than in the front-rear direction.

  The base metal fitting 50 and the holding metal fitting 52 having such a structure are caulked and fixed to each other. That is, as shown in FIG. 18, the base metal fitting 50 is overlaid on the lower surface which is the extending end surface of the pair of leg portions 32a and 32b of the main rubber elastic body 14, and the holding metal fitting 52 is attached to the base metal fitting 50 and the main rubber elastic body. Overlaid on the body 14 from above. Further, as shown in FIGS. 3 to 5, the caulking portion 74 of the holding metal fitting 52 is overlapped with the base end portion of the caulking piece 64 of the base metal fitting 50 in a contact state, and the caulking portion 74 is caulked and fixed by the caulking piece 64. The Thus, the base metal fitting 50 and the holding metal fitting 52 are fixed to each other, and the second mounting member 18 is configured by the base metal fitting 50 and the holding metal fitting 52 cooperating.

  In addition, the cylindrical part 68 of the clamping metal fitting 52 is arranged on the outer periphery of the main rubber elastic body 14 so as to be separated, and the main rubber elastic body 14 is surrounded and protected by the cylindrical part 68 over the entire circumference. Has been. Further, the stopper plate portion 24 of the first mounting member 12 is accommodated and arranged at a predetermined distance on the inner peripheral side of the cylindrical portion 68. Further, the inner flange portion 76 of the sandwiching metal fitting 52 is disposed to face the stopper plate portion 24 at a predetermined distance above the opposite side of the base metal fitting 50.

  The main rubber elastic body 14 is attached to the second attachment member 18 in a non-adhesive manner. That is, the main rubber elastic body 14 is configured such that the lower surfaces of the pair of leg portions 32 a and 32 b including the lower surface 46 of the sandwiched portion 42 are superimposed on the receiving portions 60 a and 60 b of the base metal fitting 50. The sandwiching portion 70 of the sandwiching metal 52 is overlaid on the upper surface 44. Each sandwiched portion 42 is sandwiched vertically between the receiving portions 60a and 60b of the base metal fitting 50 and the sandwiching portions 70 and 70 of the metal fitting 52 over the entire length of each leg 32 in the circumferential direction. The second mounting member 18 is sandwiched. Thereby, the main rubber elastic body 14 is attached to the second attachment member 18 with the lower ends of the pair of leg portions 32 a and 32 b being non-adhered.

  In the present embodiment, the upper surface 44 of the sandwiched portion 42 that is a contact surface with the sandwiching portion 70 is larger than the extension of the outer peripheral surface of the leg portion 32 in the overlapping direction of the base metal fitting 50 and the sandwiching metal fitting 52. Since it is inclined, the sandwiched portion 42 is effectively clamped in the vertical direction between the base metal fitting 50 and the clamp metal fitting 52. In addition, the sandwiched portion 42 is provided so as to project from the leg portion 32 so as to form a stepped shape, and the outer peripheral portion that is the leading end portion of the sandwiched portion 42 in the projecting direction is sandwiched by the second mounting member 18. The base end portion of the sandwiched portion 42 is allowed to be elastically deformed without being restrained over substantially the entire length in the circumferential direction. Therefore, it is avoided that the free surface of the outer peripheral surface of the lower end portion of the pair of leg portions 32a and 32b is excessively restrained by the clamping of each sandwiched portion 42 by the second mounting member 18, and the spring characteristics are improved. Since the influence exerted is reduced, the desired spring characteristic can be realized while realizing the strong attachment of the main rubber elastic body 14 to the second attachment member 18.

  In addition, after the integrally vulcanized molded product 16 of the main rubber elastic body 14 is overlaid on the receiving portions 60a and 60b of the base metal fitting 50 and arranged non-adheringly, the holding metal fitting 52 is overlaid from above, and the base metal fitting 50 and The main rubber elastic body 14 is clamped by the second mounting member 18 by caulking and fixing the clamping metal fitting 52. Here, when the integrally vulcanized molded product 16 is attached to the base metal fitting 50, the heads of the mounting bolts 66 are fitted into the recesses 34 opened on the lower surfaces of the pair of leg portions 32a and 32b, and a pair of The positioning projections 40 projecting from the opposing surfaces 38 of the legs 32a and 32b are fitted into the positioning recesses 58 of the base fitting 50, whereby the base fitting 50 and the pair of legs 32a and 32b are horizontally oriented (see FIG. 3 in the left-right direction and the left-right direction in FIG. 4). As described above, in this embodiment, the engagement between the recess 34 and the head of the mounting bolt 66 and the positioning convex portion 40 and the positioning concave portion 58 are provided between the base metal fitting 50 and the pair of leg portions 32a and 32b. Thus, a positioning means for relatively positioning the base metal fitting 50 and the lower ends of the pair of leg portions 32a and 32b is configured. In the present embodiment, since the concave groove 36 communicates with the concave portion 34, even if the lower surfaces of the pair of leg portions 32 a and 32 b are overlapped with the receiving portions 60 a and 60 b of the base metal fitting 50, each concave portion 34 is immediately provided. Is not sealed, and the generation of noise during the elastic deformation of the pair of leg portions 32a and 32b is prevented.

  In addition, the extended end portions (lower end portions) of the pair of leg portions 32a and 32b where the sandwiched portion 42 is formed are surrounded by the second mounting member 18 over substantially the entire circumference. The attachment member 18 is overlapped in a contact state over the entire circumference. That is, as shown in FIGS. 3 and 5, the side surface restraining portion 72 of the sandwiching metal fitting 52 extends over the entire circumferential direction on the outer circumferential surface 48 of each sandwiched portion 42 formed integrally with the pair of leg portions 32 a and 32 b. Are superimposed in a contact state. Further, as shown in FIG. 3, the convex portion 54 of the base metal fitting 50 is inserted between the pair of leg portions 32a and 32b, and the convex portion 54 is in contact with the lower end portions of the opposing surfaces 38 and 38. It is superimposed.

  In this way, the lower end portions of the pair of leg portions 32a and 32b are respectively surrounded by the second mounting member 18 over the entire circumference, and the lower end portions of the pair of leg portions 32a and 32b are connected to the outer periphery. Since elastic deformation is constrained, the lower end portions of the pair of leg portions 32a and 32b are also limited in the amount of compressive deformation in the vertical direction. Therefore, the sandwiched portion 42 that receives the compressive force in the vertical direction between the base metal fitting 50 and the clamp metal fitting 52 is sufficient between the base metal fitting 50 and the clamp metal fitting 52 by limiting the amount of compressive deformation in the vertical direction. It is pinched with reaction force.

  Furthermore, in the present embodiment, the projecting tip of the convex portion 54 is positioned above the upper surface 44 of the sandwiched portion 42 that is superimposed on the sandwiching portion 70 of the sandwiching fitting 52 so as to be on the first mounting member 12 side. As shown in FIG. 3, the convex portion 54 inserted between the opposing surfaces 38 and 38 of the pair of leg portions 32 a and 32 b protrudes above the upper surface 44 of the sandwiched portion 42 by h. As a result, the lower ends of the pair of leg portions 32a and 32b are sufficiently restricted from elastic deformation on the facing surfaces 38 and 38 that are not sandwiched in the up-and-down direction, so that the second mounting member 18 can be firmly held. .

  In the engine mount 10 having such a structure, the first mounting member 12 is attached to a power unit (not shown) as an anti-vibration connection target member via a separate fastening member 78, and the second mounting is performed. The member 18 is attached to the vehicle body side (not shown) by the mounting bolt 66. As a result, the engine mount 10 is mounted on the vehicle, and the power unit is supported by the vehicle body in a vibration-proof manner via the engine mount 10. As shown in FIGS. 1 to 4, the fastening member 78 integrally includes a central plate portion 80 and a pair of fastening plate portions 82, 82 extending upward on both sides thereof. A mounting bolt (not shown) is fixed to the first mounting member 12 by a fixing bolt 84 screwed into the screw hole 22 and each fastening plate portion 82 is inserted through the two bolt holes 86, 86. Is attached to the power unit side.

  In such a vehicle mounting state, the shaft member 20 of the first mounting member 12 is disposed to face the convex portion 54 of the base metal fitting 50 vertically with a predetermined gap. And the bound stopper means which restrict | limits the approach displacement amount of the up-down direction of the 1st attachment member 12 and the 2nd attachment member 18 is comprised because the lower surface of the shaft member 20 contact | abuts with the front end surface of the convex part 54. Yes. In addition, since the lower surface of the shaft member 20 is covered with a part of the main rubber elastic body 14, the shaft member 20 and the convex portion 54 come into contact with each other via the rubber elastic body. The sound and impact are alleviated. Further, the space between the opposing surfaces of the shaft member 20 and the convex portion 54 is communicated to the outside through an air hole 56 formed through the convex portion 54, and the shaft member 20 and the convex portion 54 are relatively displaced in the axial direction. In this case, the effect of the air spring on the spring characteristics is prevented.

  Further, the stopper plate portion 24 of the first mounting member 12 is housed and arranged at an inner peripheral side with respect to the cylindrical portion 68 of the holding metal fitting 52, and is predetermined downward with respect to the inner flange portion 76. It is arranged to face each other with a gap. Then, when the stopper plate portion 24 abuts on the cylindrical portion 68, a straight shaft stopper means for limiting the relative displacement amount of the first mounting member 12 and the second mounting member 18 in the direction perpendicular to the axis is configured. It is like that. Further, when the stopper plate portion 24 abuts on the inner flange portion 76, rebound as a displacement restricting means for restricting the axial displacement (vertical direction) of the first attachment member 12 and the second attachment member 18 from each other. Stopper means is configured. Further, the configuration of the rebound stopper means functions as a fail-safe means for preventing the main rubber elastic body 14 from coming off from the second mounting member 18 when a large load is input in the rebound direction. In addition, since the surface of the stopper plate part 24 is covered with the stopper rubber 28, the stopper plate part 24 and the holding metal fitting 52 come into contact with each other via the stopper rubber 28, and the hitting sound at the time of contact and The impact is reduced. Further, since the stopper rubber 28 of the present embodiment is provided with the buffer protrusions 30 on the upper surface and the side surface, the buffering action at the initial contact is more advantageously exhibited, and the hitting sound and impact are more advantageously reduced. Is done.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the cylindrical portion 68 and the inner flange portion 76 of the holding metal fitting 52 are not essential in the present invention and may be omitted.

  In addition, the clamping of the clamped portion 42 by the base metal fitting 50 and the clamp metal fitting 52 and the contact of the side restraint portion 72 with the clamped portion 42 may be realized in substantially the entire clamped portion 42. If the deformation of the sandwiching portion 42 is suppressed to such an extent that the holding of the main rubber elastic body 14 by the second mounting member 18 is not significantly affected, for example, the sandwiched portion 42 includes a portion that is not sandwiched on the circumference, or an outer peripheral surface. There may be 48 exposed portions.

  Further, in the embodiment, the side restraint portion 72 of the sandwiched metal fitting 52 is superimposed on the outer peripheral surface 48 of the sandwiched portion 42, but the outer peripheral surface 48 of the sandwiched portion 42 is, for example, the side restraint portion on the base metal fixture 50 side. May be provided and overlapped, or may be superimposed on both the base metal fitting 50 and the sandwiching metal piece 52.

  Moreover, the convex part 54 of the base metal fitting 50 may be provided by being attached to the base metal fitting 50 as a separate member, or a cylindrical shape that does not have a portion extending in the direction perpendicular to the axis at the protruding tip may be employed. Furthermore, the convex part 54 does not necessarily need to comprise a bound stopper means.

  The structure of the positioning means for positioning the main rubber elastic body 14 on the base metal fitting 50 is merely an example. For example, the engagement between the positioning convex portion 40 and the positioning concave portion 58, the head of the mounting bolt 66, and the like. It can also be configured by only one of the engagement of the recess 34.

  Each leg portion 32 of the main rubber elastic body 14 may be a columnar shape, various polygonal column shapes, an irregular column shape, or the like in addition to the substantially square column shape shown in the above embodiment.

10: engine mount (vibration isolation device), 12: first mounting member, 14: main rubber elastic body, 16: integrally vulcanized molded product, 18: second mounting member, 24: stopper plate portion, 32: Leg part, 34: Recess (positioning means), 38: Opposing surface, 40: Positioning convex part (positioning means), 42: Clamped part, 44: Upper surface (surface to be superimposed on the clamping bracket in the clamped part), 50: base metal fitting, 52: clamping metal fitting, 54: convex part, 58: positioning concave part (positioning means), 66: mounting bolt (positioning means), 68: cylindrical part, 76: inner flange part, 78: fastening member

Claims (7)

In the vibration isolator having a structure in which the first attachment member and the second attachment member are elastically connected by the main rubber elastic body, and the main rubber elastic body is attached to the second attachment member without bonding. ,
The main rubber elastic body includes a pair of leg portions extending from the first mounting member, and a base metal fitting constituting the second mounting member is overlaid on an extended end surface of the pair of leg portions. And a convex portion provided on the base metal fitting is inserted between the pair of leg portions and is superimposed on each facing surface of the pair of leg portions,
An extended end portion of each leg portion is formed with a sandwiched portion extending on the base metal fitting, and the clamp metal fitting which constitutes the second mounting member in cooperation with the base metal fitting is attached to the base metal fitting. By being overlapped and fixed by caulking, the clamped portion is clamped in the stacking direction between the base bracket and the clamp bracket over the entire length in the circumferential direction of each leg, and the clamped portion is An anti-vibration device characterized in that the outer peripheral surface of the extended end portion of each leg portion provided is superposed on the second mounting member over the entire circumference.   The vibration isolator according to claim 1, wherein the holding metal fitting includes a cylindrical portion surrounding the periphery of the main rubber elastic body.   The first mounting member includes a stopper plate portion, and the cylindrical portion is provided with an inner flange portion that protrudes toward an inner peripheral side, and the inner flange portion is formed on the base with respect to the stopper plate portion. Displacement restricting means, which is disposed opposite to the metal fitting and restricts the relative displacement amount of the first mounting member and the base metal fitting in the separation direction, is configured by contact between the stopper plate portion and the inner flange portion. The vibration isolator according to claim 2.   The tip of the convex part inserted between the pair of leg parts is located on the first mounting member side with respect to the overlapping surface of the clamped part to the clamping metal fitting. The vibration isolator as described in any one of Claims.   Positioning means for relatively positioning the base metal fitting and the main rubber elastic body is provided between the base metal fitting of the second mounting member and the pair of leg portions of the main rubber elastic body. Item 5. The vibration isolator according to any one of Items 1 to 4.   2. The overlapping surface of the sandwiched portion with the sandwiched metal fitting is wider than the extension of the outer peripheral surface of the leg portion with respect to the overlapping direction of the base metal fitting and the sandwiched metal fitting. The vibration isolator as described in any one of -5.   The anti-vibration device according to any one of claims 1 to 6, wherein a separate fastening member attached to the anti-vibration connection target member is rear-fixed to the first attachment member.