JP2015096754A - Vibration-proof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-proof device of a new structure which can form a first fitting member by a press plate metal fitting in a simple structure while securing durability performance and load resistance performance of a stopper mechanism.SOLUTION: A vibration-proof device 10 is provided with a body part 26 fixed to a body rubber elastic body 16 in a first attachment member 12 and a cylindrical bracket press-fit part 24. The body part 26 and the first attachment 12 provided with the bracket press-fit part 24 are integrally formed with a press plate metal fitting, and both end parts of the press plate metal fitting are abutted to each other in a circumferential direction and welded in the bracket press-fit part 24. On an outer peripheral surface of the bracket press-fit part 24, cushion rubbers 54, 56, 58 are provided at a position out of a weld bead 74 by welding in the circumferential direction, and a stopper part is composed of peripheral wall parts 28, 32, 34 out of the weld bead 74 in the cushion rubbers 54, 56, 58 and the bracket press-fit part 24.

Description

  The present invention relates to a vibration isolating apparatus in which a first mounting member and a second mounting member are connected by a main rubber elastic body, and relates to a vibration isolating apparatus that can be used for, for example, an engine mount for an automobile.

  Conventionally, as one type of vibration isolator mounted between members constituting a vibration transmission system, for example, as described in Japanese Patent Application Laid-Open No. 2007-224958 (Patent Document 1), A structure in which two attachment members are connected by a main rubber elastic body is known. In such an anti-vibration device, the first attachment member and the second attachment member are attached to each one member constituting the vibration transmission system, but by interposing a bracket at the attachment portion. In many cases, the degree of freedom in designing the mounting structure to the vehicle is ensured, or the mounting work to the vehicle is facilitated.

  By the way, generally in such a vibration isolator, the stopper mechanism which restrict | limits the relative displacement amount of a 1st attachment member and a 2nd attachment member is employ | adopted. By providing such a stopper mechanism, the amount of deformation of the main rubber elastic body when an excessive external force is input, and thus the relative displacement between members constituting the vibration transmission system, is limited, and the durability of the main rubber elastic body is ensured. be able to.

  Such a stopper mechanism, for example, as shown in Patent Document 1, is provided with a gate-shaped member that extends to the first mounting member side in the second mounting member and straddles the first mounting bracket, A bracket is provided that extends laterally from the first mounting member. The bracket mounting portion of the first mounting member abuts against the portal member via the buffer rubber, so that the relative displacement between the first mounting member and the second mounting member is limited in a buffering manner. It has become so.

  However, in the vibration isolator having the conventional structure described in Patent Document 1, since the bracket is bolt-fixed to the first mounting member, the manufacturing work including bolt fixing is troublesome. In addition, since such bolt fixing parts are required to have a large load-bearing performance, it is possible to manage the tightening force of the fixing bolts with high accuracy and take measures to prevent the fixing bolts from loosening, thereby ensuring reliability in bolt fixing. Troublesome work to ensure the performance and durability was also necessary.

  In view of this, the present applicant has disclosed in Japanese Patent No. 5209339 (Patent Document 2) that a main body portion fixed to the main rubber elastic body and a cylindrical bracket press-fitting portion to which the bracket is press-fitted and fixed from the side are pressed plates. The vibration isolator which comprised the 1st attachment member by integrally forming with the metal fitting was proposed. The first mounting member having such a structure eliminates the need for fixing bolts, reduces the number of parts, and makes the input direction of a large load substantially perpendicular to the press-fitting direction of the bracket. A large load-bearing performance can also be exhibited at a portion where the bracket is fixed to the mounting member.

  However, as a result of further investigations on the vibration isolator described in Patent Document 2, it has been found that it may be difficult to ensure sufficient durability and load bearing performance of the stopper mechanism. That is, since the first mounting member formed of the press plate metal is welded at least at one place on the circumference thereof, it protrudes on the outer peripheral surface of the bracket press-fitting portion and extends in the length direction at the welded portion. A weld bead will be generated. On the other hand, the bracket press-fit portion is provided with a buffer rubber on the outer peripheral surface thereof, and constitutes a stopper portion that is brought into contact with the aforementioned portal member. Therefore, since the weld bead existing in the bracket press-fitting portion substantially reduces the thickness of the buffer rubber at the stopper, stress and strain concentrate on the buffer rubber on the weld bead, and the buffer rubber There was a risk that durability and buffer performance would be reduced.

  In view of such a problem, it is also conceivable to join both end portions of the press plate metal constituting the first mounting member with a clinch joint structure by meshing serrated irregularities instead of welding. However, as a result of investigation by the present inventors, in the clinch joint structure, an external force is applied to the bracket press-fitted portion in the diameter increasing direction with the press-fitting of the bracket, so that the clinch joint portion is easily separated so as to open outward. It is difficult to stably obtain the required fixing strength.

JP 2007-224958 A Japanese Patent No. 5209339

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the first mounting member is secured while ensuring the durability performance and load bearing performance of the stopper mechanism. It is an object of the present invention to provide a vibration isolator having a novel structure that can be formed with a simple structure using a press plate.

  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.

  According to a first aspect of the present invention, a first mounting member and a second mounting member are connected by a main rubber elastic body, and a main body portion fixed to the main rubber elastic body at the first mounting member And a cylindrical bracket press-fitting portion, wherein the main body portion and the first attachment member having the bracket press-fitting portion are integrally formed with a press plate fitting, and the press plate Both ends of the metal fitting are butted and welded in the circumferential direction at the bracket press-fit portion, and a buffer rubber is provided on the outer peripheral surface of the bracket press-fit portion at a position where the weld bead resulting from the weld is removed in the circumferential direction. Thus, the stopper portion is constituted by the buffer rubber and the peripheral wall portion from which the weld bead is removed from the bracket press-fitting portion.

  In the vibration isolator having the structure according to this aspect, the first mounting member can be manufactured with a simple structure and a small number of parts by welding both end portions of the press plate metal. In addition, since the buffer rubber constituting the stopper mechanism is provided at a position where the weld bead by welding is removed in the circumferential direction, the thickness dimension of the buffer rubber can be sufficiently secured. Therefore, in the stopper mechanism configured using the first mounting member, it is possible to completely avoid the adverse effects caused by the weld bead and stably obtain excellent durability performance and buffer performance.

  According to a second aspect of the present invention, in the vibration isolator according to the first aspect, the shock absorbing rubber protrudes outward at a portion located on the opposite side of the main body portion on the circumference of the bracket press-fitting portion. And a first stopper portion configured to receive a main load is configured, and any of the side wall portions on both sides located between the main body portion and the first stopper portion on the periphery of the bracket press-fitting portion. In this case, the weld bead is provided.

  In the vibration isolator having a structure according to this aspect, in the first mounting member, the welded portion of the press plate metal fitting is set at a position where the main stopper load input portion is deviated on the circumference. In addition, the volume of the shock absorbing rubber at the main stopper load input portion can be sufficiently secured without being limited by the weld bead.

  According to a third aspect of the present invention, in the vibration isolator according to the second aspect, the second stopper portion and the third stopper portion are provided by providing shock-absorbing rubbers protruding outward at the side wall portions on both sides. And the weld bead is provided in the side wall portion of the second stopper portion or the third stopper portion which has a smaller input load.

  In the vibration isolator constructed according to this aspect, the first to third stopper portions can be provided on the circumference of the first mounting member to obtain a stopper function in three directions, and these three stoppers can be obtained. By setting the welded part of the press plate bracket to the part where the input load is the smallest among the parts, in each stopper part, it is possible to avoid the adverse effects of the weld bead and efficiently secure the volume of the buffer rubber, in three directions It is possible to obtain a total excellent durability and load bearing performance at the stopper portion.

  According to a fourth aspect of the present invention, in the vibration isolator according to any one of the first to third aspects, the bracket press-fit portion has at least one corner portion on the circumference, The end surface of the other end portion is abutted against and welded to the side surface of the one end portion of the press plate fitting.

  In the vibration isolator having the structure according to this aspect, it becomes easy to secure a larger rubber volume while avoiding the weld bead in the buffer rubber constituting the stopper portion. In other words, the contact surface that constitutes the stopper part should be made as flat as possible on the periphery of the press-fit part for the purpose of avoiding the concentrated action of the stopper load and ensuring durability and load bearing performance. Is desirable. Therefore, in this aspect, by setting the welded portion at the corner portion of the press plate metal fitting, it is possible to sufficiently secure the rubber volume of the buffer rubber at the stopper portion while avoiding the weld bead at the corner portion.

  According to a fifth aspect of the present invention, in the vibration isolator according to the fourth aspect, the portion that receives the main load in the bracket press-fitting portion spreads substantially perpendicularly to the input direction of the main load; And the corner portion is provided at one end portion in the circumferential direction of the flat plate-like portion, and the end face of the other end portion is opposite to the side surface of the one end portion extending from the flat plate-like portion in the press plate fitting. By welding together and welding, the weld bead is covered in the input direction of the main load by one end portion extending from the flat plate portion in the press plate fitting.

  In the vibration isolator constructed according to this aspect, the stopper portion is configured by the flat plate portion of the press plate metal fitting, so that the pressure receiving surface and the rubber volume of the stopper load in the first mounting member and the shock absorbing rubber are increased and durable. Performance and load bearing performance can be improved. Moreover, in the main load input direction, the welded part and the weld bead are covered, so that a larger pressure-receiving surface is secured in the first mounting member, and the load bearing performance by the welded part is improved. The adverse effects of can also be avoided more effectively.

  According to a sixth aspect of the present invention, in the vibration isolator according to any one of the first to fifth aspects, the bracket press-fit portion protrudes toward the outer peripheral side and opens toward the inside of the bracket press-fit portion. The main body portion is formed with a deep drawing shape, and a through hole is formed in the main body portion, and the filling rubber and the main rubber elastic body filled in the main body portion are integrally formed through the through hole. A covering rubber layer that is connected and covers the inner peripheral surface of the bracket press-fitting portion is integrally formed with the filled rubber and the main rubber elastic body.

  In the vibration isolator having a structure according to this aspect, the main body portion is formed into a deep-drawn shape and high strength is exhibited in shape, and the reinforcing effect by the main body portion with respect to the cylindrical bracket press-fit portion is also exhibited, The overall strength of the first mounting member can be increased. In addition, problems such as resonance of the first mounting member formed of the press plate fitting can be effectively prevented by the rubber formed on the inside of the main body portion and the inner peripheral surface of the bracket press-fitting portion. In addition, because the coating rubber layer is interposed between the bracket press-fitted part and the bracket that is press-fitted and fixed to the bracket, the welded part of the bracket press-fitted part when the bracket is press-fitted due to a dimensional error between the bracket press-fitted part and the bracket Excessive stress is also prevented from acting on the bracket, and the press-fitting fixing force of the bracket and the external force acting on the bracket press-fit portion can be stabilized at the same time, and problems such as corrosion caused by contact between metals Can also be avoided.

  In the vibration isolator constructed according to the present invention, the first mounting member has a small number of parts and is reliable while avoiding adverse effects due to the weld bead and ensuring excellent durability and load bearing performance in the stopper portion. It is possible to configure with a press plate fitting having excellent properties.

The top view which shows the vibration isolator as one Embodiment of this invention. The front view of the vibration isolator shown by FIG. III-III sectional drawing in FIG. IV-IV sectional drawing in FIG. The perspective view of the vibration isolator main body which comprises the vibration isolator shown by FIG. The perspective view of the 1st attachment member which comprises the vibration isolator main body shown by FIG.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described. First, FIGS. 1 to 4 show an automobile engine mount 10 as an embodiment of the vibration isolator of the present invention. As shown in FIG. 5, the engine mount 10 of the present embodiment includes a first mounting member 12 as a first mounting member and a second mounting member 14 as a second mounting member that are predetermined to each other. A mount main body 18 is provided as a vibration isolator main body which is disposed at a distance and is elastically connected by a main rubber elastic body 16 interposed therebetween. In addition, a first bracket 20 is attached to the first mounting bracket 12, and a second bracket 22 is attached to the second mounting bracket 14. The bracket 22 is fixed to an automobile power unit and a vehicle body (not shown) so that the power unit is supported by the vehicle body via the engine mount 10 in an anti-vibration manner.

  1 to 4 show a state in which the engine mount 10 is not attached to the automobile. However, in the state in which the engine mount 10 is attached to the automobile, the power unit extends in the direction of the mount axis of the mount body 18 in the vertical direction in FIG. As the main rubber elastic body 16 is elastically deformed by being subjected to the shared support load, the first mounting bracket 12 and the first bracket 20 are substantially the same as the second mounting bracket 14 and the second bracket 22. Relative displacement is achieved by approaching in the mount axis direction. Further, the main vibration to be vibration-proofed is input substantially in the mount axis direction. In the following description, the vertical direction means the vertical direction in FIG. 2 unless otherwise specified.

  More specifically, as shown in FIG. 6, the first mounting member 12 constituting the mount body 18 includes a cylindrical bracket press-fit portion 24 and a main body that protrudes from the bracket press-fit portion 24 onto the outer peripheral surface. A portion 26 is provided. The bracket press-fit portion 24 has a constant cross-sectional shape that is a substantially rectangular frame shape, and extends straight in a direction orthogonal to the mount axis direction. In the bracket press-fit portion 24, a press-fit hole 36 extending through the central axis surrounded by four substantially flat upper wall 28, lower wall 30, left wall 32, and right wall 34 is formed. . A communication hole 37 is formed in the center of the upper wall 28 so as to penetrate in the thickness direction so that an inner periphery covering rubber layer 50 and an outer periphery covering rubber layer 52 which will be described later communicate with each other.

  The main body portion 26 has a hollow substantially truncated cone shape including a tapered cylindrical peripheral wall 38 and a circular bottom wall 40, and is formed with a central axis extending in the mount axis direction. The main body portion 26 has a reverse shape with a small diameter toward the lower side, and a through hole 42 is provided in the central portion of the bottom wall 40 on the small diameter side. Further, the large-diameter side opening 44 of the main body portion 26 is integrally connected to the central portion of the lower wall 30 of the bracket press-fitting portion 24, and the internal space of the main body portion 26 has a large-diameter side opening 44. , The bracket press-fit portion 24 is opened and communicated.

  On the other hand, the second mounting bracket 14 has a cylindrical shape larger in diameter than the main body portion 26 of the first mounting bracket 12. The second mounting bracket 14 is arranged at a predetermined distance in the axial direction on the mount center axis from the first mounting bracket 12, and the outer peripheral side of the main body portion 26 of the first mounting bracket 12. Further, the second mounting member 14 is disposed so as to be opposed to each other in the oblique radial direction at a predetermined distance downward in the axial direction.

  Accordingly, the outer peripheral surface of the main body portion 26 of the first mounting member 12 and the inner peripheral surface of the second mounting member 14 that are opposed to each other are elastically connected to each other, so that the main body rubber An elastic body 16 is provided.

  The main rubber elastic body 16 has a substantially frustoconical shape with a small diameter upward, and the main body portion 26 of the first mounting member 12 is inserted into the small diameter side end portion from the upper end surface. It is fixedly embedded in. Further, the second mounting bracket 14 is extrapolated and fixed to the large-diameter side end of the main rubber elastic body 16 so as to cover the outer peripheral surface. In particular, in the present embodiment, the main rubber elastic body 16 is formed of an integrally vulcanized molded product that is vulcanized and bonded to the first and second mounting brackets 12 and 14.

  A circular recess 46 having a substantially inverted mortar shape is formed in the lower part of the main rubber elastic body 16. Since the circular recess 46 is opened with a large-diameter circular opening on the large-diameter side end surface, the main rubber elastic body 16 substantially has the main body portion 26 of the first mounting bracket 12 and the second portion. It is set as the thick substantially taper cylinder shape which spreads so that between the opposing surfaces in the diagonal radial direction with the mounting bracket 14 may be connected.

  The main rubber elastic body 16 also enters the internal space of the main body portion 26 through the through hole 42 of the main body portion 26 of the first mounting member 12. A filling rubber 48 filling the main body portion 26 is formed integrally with the main rubber elastic body 16.

  Furthermore, the main rubber elastic body 16 extends around the inner peripheral surface of the bracket press-fit portion 24 of the first mounting member 12. An inner peripheral covering rubber layer 50 that covers the entire inner peripheral surface of the press-fitting hole 36 of the bracket press-fitting portion 24 with a predetermined thickness is formed integrally with the main rubber elastic body 16 and the filling rubber 48. .

  Furthermore, the main rubber elastic body 16 extends and extends to the outer peripheral surface of the bracket press-fit portion 24 of the first mounting member 12. An outer peripheral covering rubber layer 52 that covers substantially the entire outer peripheral surface of the bracket press-fit portion 24 is formed integrally with the main rubber elastic body 16, the filling rubber 48, and the inner peripheral covering rubber layer 50.

  In addition, the upper wall 28, the right wall 32, and the left wall 34 of the bracket press-fit portion 24 have first and second buffer rubbers 54 and 56, each having a substantially mountain shape protruding on the outer peripheral surface. The third buffer rubber 58 is integrally formed with the outer peripheral covering rubber layer 52. In the first buffer rubber 54 of the present embodiment, two substantially chevron-shaped protrusions that are separated from each other in the circumferential direction of the bracket press-fit portion 24 and that extend in parallel in the axial direction are integrated at the bottom of each other. It is a connected structure.

  Further, the main rubber elastic body 16 has a tongue-like shape or a flat plate shape with a predetermined thickness from the lower wall portion at one opening edge of the first mounting member 12 toward the axially outward direction in the vicinity of the end portion on the small diameter side. A lower cushioning rubber 59 extending integrally is formed integrally.

  The mount body 18 having such a structure is press-fitted on the first bracket 20 from a direction perpendicular to the mount center axis with respect to the bracket press-fit portion 24 of the first mounting bracket 12. The fixing part 60 is press-fitted and fixed. And this 1st bracket 20 is bolt-fixed through the bolt hole 63 with respect to the power unit of a motor vehicle in the outer side fixing | fixed part 62 extended from the bracket press-fit part 24, Through the 1st bracket 20, The first mounting bracket 12 is attached to the power unit.

  On the other hand, a cylindrical external fitting fixing portion 64 provided on the second bracket 22 is externally fitted and fixed to the second mounting member 14 from below. The second bracket 22 is provided with a plurality of mounting leg portions 66 protruding from the outer fitting fixing portion 64 on the outer peripheral surface, and these mounting leg portions 66 are bolt holes 67 with respect to the vehicle body of the automobile. The second mounting bracket 14 is attached to the vehicle body via the second bracket 22 by being bolted through.

  Further, the second bracket 22 is provided with a stopper metal 68 extending upward from the external fitting fixing portion 64. The stopper fitting 68 has a gate shape as a whole, and opens in the same direction as the bracket press-fit portion 24 of the first attachment fitting 12 so as to straddle the outer periphery of the first attachment fitting 12 with a predetermined distance. It is provided to do. The lower ends of the both side leg portions 70, 70 of the stopper metal 68 are fixed to the external fitting fixing portion 64, and the upper plate portion 72 connecting the upper ends of the both side leg portions 70, 70 is the first mounting bracket 12. Is spaced apart from above.

  As a result, the upper wall 28 of the bracket press-fit portion 24 in the first mounting bracket 12 is opposed to the upper plate portion 72 of the stopper bracket 68 at a predetermined distance in the vertical direction. Further, the left wall 32 and the right wall 34 of the bracket press-fitting portion 24 in the first mounting bracket 12 are opposed to the both side leg portions 70, 70 of the stopper bracket 68 at a predetermined distance in the left-right direction. Yes.

  Then, the upper wall 28 of the bracket press-fit portion 24 and the upper plate portion 72 of the stopper fitting 68 are in contact with each other via the first buffer rubber 54, so that the input direction of the rebound load that becomes the main load input direction in design. The first stopper mechanism for limiting the relative displacement amount of the first mounting bracket 12 and the second mounting bracket 14 in a buffer manner is configured. That is, the upper wall 28 in the bracket press-fit portion 24 spreads substantially perpendicular to the input direction of the rebound load, and is a flat plate portion as a portion that receives the main load in the bracket press-fit portion 24.

  Further, the right wall 32 of the bracket press-fitting portion 24 and the right leg portion 70a of the stopper fitting 68 are in contact with each other via the second shock absorbing rubber 56, so that the acceleration in the second main load input direction in design is achieved. A second stopper mechanism for limiting the relative displacement of the first mounting bracket 12 and the second mounting bracket 14 in a buffering manner in the input direction of the load is configured.

  Furthermore, the left wall 34 of the bracket press-fitting portion 24 and the left leg portion 70b of the stopper fitting 68 are brought into contact with each other via the third shock absorbing rubber 58, thereby reducing the load input direction that is the smallest in design. A third stopper mechanism for limiting the relative displacement amount of the first mounting bracket 12 and the second mounting bracket 14 in a buffering manner in the input direction of the load is configured.

  In the present embodiment, a lower cushion rubber 59 is provided between the first bracket 20 and the second bracket 22. Thereby, the first mounting bracket 12 and the second mounting member 14 can come into contact with each other via the lower shock absorbing rubber 59 when the load in the bound direction is input. A bound stopper mechanism for buffering the amount of displacement in the direction of relative approach to the mount center axis direction with respect to 14 is configured.

  Here, the first mounting bracket 12 constituting the first to third stopper mechanisms is configured by using a pressed plate metal member obtained by pressing a metal base plate. Such a press plate metal fitting is applied to the main body portion 26 with respect to the band plate portion corresponding to the developed shape of the bracket press-fitting portion 24 by subjecting a flat plate-shaped metal base plate to a required number of press processes such as bending and deep drawing. The corresponding deep drawing portion is formed with a structure integrally formed. Further, by bending at approximately 90 degrees on both sides of the deep drawing portion to provide three corner portions, the band plate portion is press-formed into a rectangular cylindrical shape, and the intended first mounting bracket 12 is configured. Has been.

  That is, in the first mounting bracket 12, both end portions in the length direction of the band plate portion are abutted at the remaining one corner portion that is not subjected to bending processing, and the entire abutting portion is welded. A rectangular cylindrical bracket press-fitting portion 24 is configured as follows. In this abutting portion, one end portion of the strip plate portion constituting the upper wall 28 is overlapped with the other end portion of the strip plate portion constituting the left wall 34 so as to be covered from above. The upper end surface of the left wall 34 is overlapped and butted against the lower surface near the end of the wall 28 and is welded. As a result, the welded part is set at the corner located at the upper end of the left wall 34, and the weld bead 74 at the welded part is provided at the depression between the lower surface of the upper wall 28 and the outer surface of the left wall 34. ing. That is, the weld bead 74 is positioned only on the left wall 34 having the smallest design input load on the outer peripheral surface of the bracket press-fitting portion 24, and the upper wall 28 and the right wall 32 having a larger input load are arranged. It is provided avoiding the outer peripheral surface.

  Furthermore, the upper edge of the upper wall 28 is protruded outwardly from the butted portion of the left wall 34 at the welding portion in a hook shape or a hook shape, so that the upper portion of the weld bead 74 is covered by the hook portion 76. It is hidden. In the rebound direction, which is the main load input direction in design, the cover 76 is covered and covered by the flange portion 76 of the upper wall 28 from the lower surface of the upper plate portion 72 that is a contact surface.

  Further, in the bracket press-fitting portion 24 of the first mounting bracket 12, the third buffer rubber 58 on the outer peripheral surface of the left wall 34 provided with the weld bead 74 avoids the weld bead 74 in the circumferential direction. Is formed. As a result, the third stopper mechanism is configured in the left wall 34 of the bracket press-fit portion 24 at a position away from the weld bead 74 in the circumferential direction.

  The first and second shock absorbing rubbers 54 and 56 are formed so as to protrude with a sufficiently wide surface because the weld bead 74 does not exist on the upper wall 28 and the right wall 32 where they are formed. .

  In the engine mount 10 structured as described above, the first, second and third buffer rubbers 54, 56, 58 are provided on the outer peripheral surface of the bracket press-fit portion 28 at positions where the weld beads 74 are removed in the circumferential direction. Therefore, a local decrease in the thickness of the buffer rubbers 54, 56, and 58 due to the weld bead 74 can be avoided, and a sufficient thickness can be ensured. Thereby, in the 1st, 2nd, and 3rd stopper mechanisms, the buffer action and durability by the 1st, 2nd, and 3rd buffer rubbers 54, 56, and 58 can be exhibited effectively, respectively.

  In particular, in the present embodiment, welding on the upper wall 28 that is a surface that receives the main load of the bracket press-fitting portion 24 is avoided, and the side on which the input load on the left and right walls 34 and 32 is smaller (in the present embodiment, the left wall). On the 34th side), the press plate metal is welded. Thereby, the input load to the welding part can be further reduced.

  Furthermore, in the present embodiment, one end portion of the press plate fitting constituting the upper wall 28 of the bracket press-fitting portion 24 is from above with respect to the other end portion of the press plate fitting constituting the left wall 34 of the bracket press-fit portion 24. The upper end surface of the left wall 34 and the lower surface of the upper wall 28 are abutted and welded. Thereby, in the bracket press-fit portion 24, the weld bead 74 is placed on the lower surface of the upper wall 28 to which the main load is input, and it is avoided that the load is directly input to the weld bead 74. The durability can be further improved.

  Moreover, in this embodiment, since the main-body part 26 of the 1st mounting bracket 12 is made into the deep drawing shape which has a cylindrical surrounding wall, the improvement of the intensity | strength of the 1st mounting bracket 12 itself can also be aimed at. . Further, since the bracket press-fitting portion 24 and the main body portion 26 are integrally formed by press molding, the first mounting bracket 12 can be easily manufactured, and both sufficient strength and easy manufacturing can be achieved. Realized. In addition, the inner peripheral covering rubber layer 50 and the outer peripheral covering rubber layer 52 that are covered on the inner periphery and the outer periphery of the bracket press-fit portion 24, the filling rubber 48 that is filled in the main body portion 26, and the main rubber elastic body 16 are integrated. Therefore, the manufacture of the mount body 18, which is an integrally vulcanized molded product, and thus the engine mount 10, can be easily achieved.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, although the bracket press-fitting portion 24 of the above-described embodiment has a rectangular cylindrical shape, it is not limited to this aspect, and if it is a cylindrical shape, the outer shape can be appropriately changed according to the shape of the bracket to be used.

  Further, the peripheral wall portion 38 of the main body portion 26 of the first mounting bracket 12 does not need to be formed over the entire circumference. For example, the main body portion 26 is formed into a groove shape extending in a direction perpendicular to the mount axis with a constant cross section, and the bracket press-fitting. The entire first mounting member 12 including the portion 24 and the main body portion 26 can be formed in a cylindrical shape extending in the direction perpendicular to the mount axis.

  Further, in the above embodiment, the welding bead 74 is placed by welding on the input direction of the load at the time of deceleration of the vehicle, that is, on the left wall 34 side in the bracket press-fitting portion 24, but is not limited to this mode. The weld bead may be placed by welding on the right wall side. Alternatively, welding may be performed on the upper wall, and a weld bead may be placed on the upper surface of the upper wall. In any such structure, it is only necessary that the buffer rubber is provided at a position off the weld bead.

  Moreover, in the said embodiment, although the upper end part of the left wall 32 which is a corner | angular part in the bracket press-fit part 24 made into the substantially polygonal cylinder shape was made into the welding site | part, the weld bead was placed, for example, a substantially flat wall It is also possible to set a welding part in the middle part of the part.

10: engine mount (vibration isolation device), 12: first mounting bracket (first mounting member), 14: second mounting bracket (second mounting member), 16: main rubber elastic body, 24: bracket Press-fit part, 26: body part, 28: upper wall (flat plate part), 32: right wall, 34: left wall, 42: through-hole, 48: filled rubber, 50: inner peripheral covering rubber layer, 52: outer peripheral covering Rubber layer, 54: first buffer rubber, 56: second buffer rubber, 58: third buffer rubber, 74: weld bead, 76: buttocks

Claims (6)

The first mounting member and the second mounting member are connected by a main rubber elastic body, and a main body portion fixed to the main rubber elastic body in the first mounting member and a cylindrical bracket press-fitting portion are provided. An anti-vibration device provided,
The first mounting member having the main body portion and the bracket press-fitting portion is integrally formed with a press plate fitting, and both end portions of the press plate fitting are butted and welded in the circumferential direction at the bracket press-fitting portion. In addition, the outer peripheral surface of the bracket press-fitting portion is provided with a buffer rubber at a position where the weld bead resulting from the welding is removed in the circumferential direction. A vibration isolator comprising a stopper portion. A first stopper portion configured to receive a main load is provided in the portion located on the opposite side of the main body portion on the periphery of the bracket press-fitting portion, and the cushioning rubber protruding outward is provided.
2. The vibration isolator according to claim 1, wherein the weld bead is provided at any one of side wall portions located on both sides of the bracket press-fitting portion between the main body portion and the first stopper portion. The second stopper portion and the third stopper portion are configured by providing cushioning rubbers protruding outward in the side wall portions on both sides, respectively.
The vibration isolator according to claim 2, wherein the weld bead is provided at the side wall portion of the second stopper portion or the third stopper portion which has a smaller input load.   The bracket press-fitting portion has at least one corner portion on the periphery, and the end surface of the other end portion is abutted against and welded to the side surface of the one end portion of the press plate fitting. Item 4. The vibration isolator according to any one of Items 1 to 3.   The portion that receives the main load in the bracket press-fitting portion is a flat plate portion that extends substantially orthogonal to the input direction of the main load, and the corner portion at one end in the circumferential direction of the flat plate portion In the press plate fitting, the end surface of the other end portion is attached to and welded to the side surface of the one end portion extending from the flat plate portion in the press plate fitting, so that the press plate fitting extends from the flat plate portion. The vibration isolator according to claim 4, wherein the weld bead is covered by an end portion in an input direction of the main load.   The main body portion is formed with a deep drawing shape that protrudes from the bracket press-fit portion toward the outer peripheral side and opens toward the inside of the bracket press-fit portion, and a through hole is formed in the main body portion, The filled rubber filled in the main body portion and the main rubber elastic body are integrally connected through the through hole, and a covering rubber layer covering the inner peripheral surface of the bracket press-fitting portion includes the filled rubber and the main rubber. The vibration isolator as described in any one of Claims 1-5 formed integrally connected with an elastic body.

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