JP6537958B2 - Vibration isolator with bracket - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a bracketed vibration damping device used for an engine mount of a car or the like.

  Conventionally, a vibration control device is known as a kind of a vibration control support or a vibration control connector, which is disposed between members constituting a vibration transmission system, and the constituent members of the vibration transmission system are vibration-proof coupled to each other. For example, it is applied to an engine mount of a car. For example, as disclosed in Japanese Patent Application Publication No. 2008-132846 (Patent Document 1), etc., this vibration damping device includes an inner cylinder attached to an engine constituting a vibration transmission system and a vehicle body constituting a vibration transmission system. It has a structure in which an outer cylinder to be attached is elastically connected to each other by a rubber elastic body.

  Moreover, in patent document 1, the anti-vibration apparatus with a bracket with which the engine bracket was attached to the inner cylinder is shown, and the engine bracket is interposed between the inner cylinder and the engine. The engine bracket is press-fitted into the inner cylinder, and a portion protruding from the inner cylinder is fixed to the engine.

  By the way, in the bracketed anti-vibration apparatus of Patent Document 1, a stopper that limits the amount of relative displacement between the inner cylinder and the outer cylinder is configured. That is, the vehicle body bracket fixed to the outer cylinder is disposed on the outer peripheral side of the inner cylinder at a predetermined distance, and the stopper effect is obtained by the abutment of the inner cylinder and the vehicle body bracket. Further, a rubber layer integrally formed with the rubber elastic body is fixed to the outer peripheral surface of the inner cylinder, so that the hitting noise and impact at the time of contact with the stopper can be alleviated.

  However, in the structure of Patent Document 1 in which the rubber layer is integrally formed with the rubber elastic body, there is a problem that it is difficult to realize both the characteristics required for the rubber elastic body and the characteristics required for the rubber layer. . That is, the rubber elastic body is required to have a relatively soft spring constant in order to advantageously obtain the vibration proof performance by elastic deformation, but if it is intended to sufficiently obtain the vibration proof performance of the rubber elastic body, The load resistance of the integrally formed rubber layer may be insufficient, and the rubber layer may be damaged when the stopper is in contact. On the other hand, when attempting to set a relatively large spring constant capable of sufficiently satisfying the load resistance in the rubber layer, the spring constant of the rubber elastic body also becomes large, and it is difficult to achieve the desired vibration damping performance.

JP, 2008-132846, A

  The present invention has been made against the background described above, and the object of the present invention is to achieve both the characteristics required of the main rubber elastic body and the characteristics required of the stopper rubber. It is an object of the present invention to provide a bracketed anti-vibration device having a novel structure which can obtain vibration performance and shock absorbing stopper action.

  The following describes aspects of the present invention made to solve such problems. In addition, the component employ | adopted in each aspect described below can be employ | adopted as much as possible in arbitrary combination.

  That is, in 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 cylindrical portion formed on the first mounting member side is used. In a bracketed vibration damping device in which a bracket is press-fitted and provided with a stopper for limiting the amount of elastic deformation of the main rubber elastic body, the first stopper rubber integrally formed with the main rubber elastic body is A second stopper rubber provided on the one mounting member and formed separately from the main rubber elastic body and having a spring constant larger than that of the first stopper rubber, provided on the bracket; The stopper abuts against the first stopper rubber and the second stopper rubber by relative displacement of the first mounting member and the second mounting member to limit the elastic deformation of the main rubber elastic body. Together have a rubber abutment surface, the stopper rubber of the first in the stopper to be close to the stopper rubber abutment surface than said second stopper rubber, and wherein.

  According to the bracketed vibration damping device having the structure according to the first aspect of the present invention, the first stopper rubber and the second stopper rubber are provided on the second mounting member side in the stopper. By sequentially abutting, the buffer action by the stopper rubber is exhibited stepwise. That is, when the load input between the first attachment member and the second attachment member is relatively small, the first stopper rubber having a small spring constant abuts against the stopper rubber contact surface. The amount of elastic deformation of the main rubber elastic body is limited in a state where the impact and hitting noise at the time of contact are reduced. On the other hand, when the load input between the first attachment member and the second attachment member is large, the second stopper rubber having a large spring constant abuts against the stopper rubber contact surface, whereby the main rubber The amount of elastic deformation of the elastic body is reliably limited. Furthermore, even when a large load is input, the first stopper rubber having a small spring constant comes first into contact with the stopper rubber contact surface, thereby reducing the impact due to the contact of the second stopper rubber.

  Furthermore, since the first stopper rubber having a small spring constant is integrally formed with the main rubber elastic body, the number of parts required for the stopper rubber which receives a relatively small load can be reduced while realizing the required performance of the main rubber elastic body. Can be provided. On the other hand, since the second stopper rubber having a large spring constant is formed separately from the main rubber elastic body, the stopper rubber that limits the amount of elastic deformation of the main rubber elastic body effectively and with excellent durability is provided. Can be provided without affecting the spring characteristics of the main rubber elastic body.

  According to a second aspect of the present invention, in the vibration damping device with a bracket described in the first aspect, the first stopper rubber is provided in a plurality of directions on the circumference of the cylindrical portion, and Two stopper rubbers are provided in a plurality of directions on the surface of the bracket, and the stoppers are respectively configured in a plurality of directions in which the first stopper rubber and the second stopper rubber are provided.

  According to the second aspect, in the stoppers provided in a plurality of directions, the buffer action and the stopper action by the first stopper rubber and the second stopper rubber are exhibited.

  According to a third aspect of the present invention, in the bracketed vibration damping device described in the first or second aspect, the rubber hardness of the second stopper rubber is made larger than the rubber hardness of the first stopper rubber. It is

  According to the third aspect, the difference in spring constant of the first stopper rubber and the second stopper rubber can be realized by the difference in rubber hardness of the forming material.

A fourth aspect of the present invention is the vibration damping device with a bracket according to any one of the first to third aspects, wherein the projection dimension of the second stopper rubber from the bracket is the first stopper It is made smaller than the protrusion dimension from the said cylindrical part of rubber | gum.

  According to the fourth aspect, by making the first stopper rubber thick, it becomes easy to set the spring constant of the first stopper rubber small, and the buffer action is effectively exhibited, and By making the second stopper rubber thin, the spring constant of the second stopper rubber can be easily set large, and the excellent stopper action is exhibited.

  According to a fifth aspect of the present invention, in the anti-vibration device with a bracket described in any one of the first to fourth aspects, the bracket is inclined and spread with respect to the press-fitting direction to the cylindrical portion. The bracket is positioned in the press-fitting direction with respect to the cylindrical portion by the abutment of the step surface and the opening end face of the cylindrical portion, and the second stopper rubber is provided. Is provided with a holding portion which is held between the prescribed step surface and the first stopper rubber.

  According to the fifth aspect, the press-fit end of the bracket into the tubular portion is defined by the contact between the prescribed step surface and the open end face of the tubular portion, so that the bracket is properly positioned with respect to the first mounting member Can be easily attached to

  Further, the holding portion of the second stopper rubber is held between the prescribed step surface of the bracket attached to the first attachment member and the first stopper rubber provided on the first attachment member. A second stopper rubber separate from the main rubber elastic body is positioned and held at an appropriate position relative to the bracket.

  According to a sixth aspect of the present invention, in the vibration damping device with a bracket described in the fifth aspect, the prescribed stepped surface spreads on both sides of the bracket, and both inner end portions of the prescribed stepped surface have the tubular shape. The bracket is in contact with the opening end face of the part, and the bracket is formed with notches opened at both outer ends of the defined stepped surface, and the defined stepped surface is against the first stopper rubber at the notch. The holding portion of the second stopper rubber is sandwiched between the first stopper rubber and the outer end portions on both sides of the prescribed step surface on which the notches are formed. It is.

  According to the sixth aspect, the bracket is more stable with respect to the first mounting member because the defined step surfaces provided on both sides of the bracket abut on the opening end surface of the cylindrical portion of the first mounting member. Is positioned. Furthermore, the second stopper rubber is positioned more stably with respect to the bracket by the sandwiching portion of the second stopper rubber being sandwiched between the prescribed step surface and the first stopper rubber on both sides of the bracket. Ru. In addition, notches are provided at both outer ends of the prescribed step surface, and the second stopper rubber pinching portion is pinched in a state inserted into the notch, so the pinching portion is pinched in a more stable state By providing the second stopper rubber so as to cover the center portion of the bracket which is not supported while being supported, it is possible to obtain a large area covering the second stopper rubber bracket.

  According to the present invention, the shock absorbing action by the stopper rubber is exhibited stepwise by the first stopper rubber having a small spring constant and the second stopper rubber having a large spring constant being in contact with the stopper rubber contact surface in the stopper. Be done. Moreover, since the first stopper rubber having a small spring constant is closer to the stopper rubber contact surface than the second stopper rubber having a large spring constant, the shock at the time of stopper contact is reduced. Furthermore, since the first stopper rubber is integrally formed with the main rubber elastic body and the second stopper rubber is formed separately from the main rubber elastic body, the elastic deformation amount of the main rubber elastic body can be reduced. It is possible to obtain a stopper rubber that is limited effectively and with excellent durability while highly realizing the required performance of the main rubber elastic body.

The front view which shows the engine mount as 1st embodiment of this invention in an outer bracket mounting state. FIG. 2 is a left side view of the engine mount shown in FIG. 1; The top view of the engine mount shown in FIG. IV-IV sectional drawing of FIG. FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4. The principal part expanded sectional view which expands and shows the VI-VI cross section of FIG. FIG. 2 is a perspective view showing the engine mount shown in FIG. 1 in an outer bracket unmounted state. FIG. 8 is an exploded perspective view of the engine mount shown in FIG. 7; FIG. 8 is an exploded plan view of the engine mount shown in FIG. 7; The principal part expanded sectional view which expands and shows the A section of FIG. 4 in a vehicle mounting state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  An engine mount 10 for a motor vehicle is shown in FIGS. 1 to 3 as a first embodiment of a vibration-damping device constructed according to the invention. The engine mount 10 is provided with a mount main body 12, and the mount main body 12 elastically connects the first mounting member 14 and the second mounting member 16 to each other by a main rubber elastic body 18, as shown in FIGS. It has the following structure. In the following description, in principle, the vertical direction refers to the vertical direction in FIG. 1 which is the mount central axis direction and is the main vibration input direction. Further, the left-right direction refers to the left-right direction in FIG. 3 that is the left-right direction of the vehicle in the vehicle mounted state, and the front-back direction refers to the vertical direction in FIG. .

  More specifically, the first mounting member 14 is a hard member formed of metal or synthetic resin, and is a fixing portion having a cylindrical portion 20 extending left and right and a substantially bottomed cylindrical shape or a cup shape. It has 22 and. As shown in FIGS. 4 and 5, the cylindrical portion 20 extends in the left-right direction with a substantially rounded rectangular cross section, and the fitting projection 24 in which the front-rear central portion of the upper wall protrudes downward over the entire length in the left-right direction It is partially recessed on the circumference toward the inner circumference. Furthermore, the lower wall of the cylindrical portion 20 protrudes leftward more than the upper wall and the front and rear side walls, and the upper end portion of the fixed portion 22 is integrally formed in the central portion of the lower wall of the cylindrical portion 20. An upper opening portion 22 is open toward the inner peripheral space of the cylindrical portion 20. A through hole is formed in the front and rear side walls of the cylindrical portion 20 and the bottom wall of the fixed portion 22 so that the rubber material is the inner periphery of the cylindrical portion 20 and the fixed portion 22 during vulcanization molding of the main rubber elastic body 18 described later. It is easy to turn around. The first mounting member 14 of the present embodiment is formed of a press fitting, and the cylindrical portion 20 and the fixing portion 22 are integrally formed by press processing.

  The second attachment member 16 is a hard member formed of the same material as the first attachment member 14 and has a thin-walled large-diameter, substantially cylindrical shape as a whole, and the upper part is more than the lower part It has a large diameter stepped shape.

  The first mounting member 14 is disposed above the second mounting member 16, and the first mounting member 14 and the second mounting member 16 are elastically connected to each other by the main rubber elastic body 18. . The main rubber elastic body 18 has a thick, substantially conical shape, and the fixed portion 22 of the first mounting member 14 is embedded in a radially central portion in a vulcanized manner in a buried state, and the large diameter side The second mounting member 16 is bonded by vulcanization to the outer peripheral surface of the end. In the present embodiment, the main rubber elastic body 18 is formed as an integrally vulcanized molded article provided with the first attachment member 14 and the second attachment member 16.

  Further, the main rubber elastic body 18 is formed with a large diameter recess 26 which is opened at the large diameter axial end surface (lower surface). The large diameter recess 26 has a substantially bowl shape in the opposite direction, and the formation of the large diameter recess 26 causes the main rubber elastic body 18 to move downward toward the outer periphery in the longitudinal cross section shown in FIGS. It has a tapered shape that tilts.

  Furthermore, the main rubber elastic body 18 integrally includes a fitting rubber 28 which covers the inner peripheral surface of the cylindrical portion 20 and is filled in the inner periphery of the fixed portion 22. A mounting hole 30 is formed in the fitting rubber 28 so as to pass through the inner circumference of the cylindrical portion 20 in the left and right direction.

  Furthermore, a first stopper rubber 32 is provided above the main rubber elastic body 18. As shown in FIG. 5, the first stopper rubber 32 is integrally formed with the main rubber elastic body 18 and is fixed to the outer peripheral surface of the cylindrical portion 20 of the first mounting member 14. The first stopper rubber 32 of the present embodiment includes a low spring upper portion 38 fixed to the upper wall of the cylindrical portion 20, a low spring front portion 34 fixed to the front wall of the cylindrical portion 20, and a cylindrical portion A low spring rear portion 36 fixed to the rear wall 20 is integrally provided, and provided in a plurality of directions on the circumference of the cylindrical portion 20. The specific shapes of the low spring front portion 34 and the low spring rear portion 36 and the low spring upper portion 38 are not particularly limited, but in the present embodiment, the low spring front portion is formed in a substantially square block shape. 34 and the low spring rear portion 36 project from the cylindrical portion 20 more than the low spring upper portion 38 and are made thicker. Furthermore, by forming the fitting protrusion 24 on the upper wall of the cylindrical portion 20, the low spring upper portion 38 is made thicker in the front-rear central portion than in the front and rear end portions.

  An outer bracket 40 is attached to the mounting body 12 configured as described above. The outer bracket 40 is a highly rigid member formed of metal, synthetic resin or the like, and as shown in FIGS. 4 and 5, substantially cylindrical mounting fixed to the second mounting member 16 in an extrapolated state A cylindrical member 42 is provided. Furthermore, the outer bracket 40 is provided with a bound receiving member 44 superimposed and fixed on the upper end surface of the mounting cylindrical member 42, and the bound receiving member 44 is formed in a plate shape extending in the left and right direction. The mount insertion hole 46 of the circular cross section which penetrates the center part of the upper and lower sides is formed.

  Furthermore, front and rear leg members 48 are fixed to the mounting cylindrical member 42. The leg members 48, 48 are fixed to the outer peripheral surface of the mounting cylindrical member 42 and extend vertically, and have lower end portions bent forward and backward and bolt holes 50 penetrating vertically. In the present embodiment, the front and rear leg members 48, 48 have different shapes which are different from each other in the inclination angle of the portion extending downward from the mounting cylindrical member 42, but have substantially the same structure. The front and rear leg members 48 may have the same shape as each other, or may have different structures, such as different shapes.

  Further, reinforcing members 52 are attached to the front and rear leg members 48, 48. As shown in FIG. 2 and FIG. 4, the reinforcing member 52 has a substantially plate shape, is fixed to the outer peripheral surface of the mounting cylindrical member 42 and extends in the front and rear direction. Then, the front and rear end portions of the reinforcing member 52 are fixed to one side of each of the front and rear leg members 48, 48, whereby the front and rear leg members 48, 48 are mutually connected by the reinforcing member 52. The members 48, 48 are positioned relative to each other and reinforced.

  Further, the upper receiving member 54 is fixed to the mounting cylindrical member 42 and the front and rear leg members 48 and 48. As shown in FIGS. 4 and 5, the upper receiving member 54 is a curved plate connecting the right ends of the front side wall 56 and the rear side wall 58 opposite to each other and the right ends of the front and rear side walls 56 and 58 in a continuous manner. Right side wall portion 60 and an upper wall portion 62 continuously provided on upper ends of the side wall portions 56, 58, 60 and extending in the lateral direction integrally. The front and rear side wall portions 56 and 58 are fixed to the upper portions of the front and rear leg members 48 and 48, and the right side wall portion 60 is overlapped and fixed to the outer peripheral surface of the upper end portion of the mounting cylindrical member 42. . Thus, the upper receiving member 54 is provided to cover the upper side of the mounting cylindrical member 42. In the present embodiment, the reinforcing ribs 64 that extend outward are formed integrally and continuously with the left end portions of the front and rear side wall portions 56 and 58 and the upper wall portion 62, and the deformation rigidity of the upper receiving member 54 is enhanced.

  The outer bracket 40 is attached to the mount main body 12 by the second mounting member 16 of the mount main body 12 being press-fitted and fixed to the mounting cylindrical member 42 from below. Further, when the outer bracket 40 is attached to the mount body 12, the upper and lower intermediate portions of the mount body 12 are inserted into the mount insertion hole 46 of the bound receiving member 44, and the cylindrical portion 20 of the first mounting member 14 is It is disposed between the upper and lower portions of the bound receiving member 44 and the upper wall portion 62 of the upper receiving member 54. Further, in the single state before mounting on the vehicle, as shown in FIGS. 4 and 5, the low spring upper portion 38 fixed to the upper surface of the cylindrical portion 20 is in contact with the upper wall portion 62 of the upper receiving member 54, A low spring front portion 34 and a low spring rear portion 36 fixed to the front and rear outer surfaces of the cylindrical portion 20 are disposed to face each one of the front and rear side wall portions 56 and 58 of the upper receiving member 54 separately.

  On the other hand, an inner bracket 66 as a bracket is attached to the mount body 12. The inner bracket 66 is a highly rigid member formed of metal, synthetic resin or the like, and is fitted with a press-fit portion 68 corresponding to the mounting hole 30 formed on the inner periphery of the cylindrical portion 20 of the first mounting member 14. A mounting portion 70 integrally formed with the press-fit portion 68 and made wider in the front and rear direction than the press-fit portion 68 is integrally provided. Incidentally, as shown in FIGS. 5 and 6, the press-fit portion 68 is provided with upper concave grooves 72, 72 opened in the upper surface and extending left and right which is the length direction, and is opened in the lower surface Lower left and right lower grooves 74, 74 are provided, and the frictional resistance is reduced when the press-fit portion 68, which will be described later, is press-fitted into the mounting hole 30, thereby facilitating the assembly work. Further, as shown in FIGS. 4 and 6, a plurality of ridges extending in the circumferential direction are formed on portions of the press-in portion 68 which are deviated from the upper grooves 72, 72 and the lower grooves 74, 74. The inner bracket 66 is less likely to come out of the mounting hole 30. Further, as shown in FIG. 3, three bolt holes 76, 76, 76 penetrating vertically are formed apart from each other in the front and back as shown in FIG. As shown in 1 and 2, a downwardly projecting positioning pin 78 is implanted.

  Further, the mounting portion 70 is wider in the front and rear direction than the press-in portion 68, whereby the boundary portion between the press-in portion 68 and the mounting portion 70 in the inner bracket 66 can be provided with defined stepped surfaces 80 as shown in FIG. , 80 are formed. The prescribed step surface 80 is a right end surface of the mounting portion 70, and is substantially orthogonal to the left-right direction, which is the press-fitting direction of the press-fit portion 68 described later into the cylindrical portion 20. The press-fit portion 68 protrudes inward and backward of the prescribed step surfaces 80 and 80 in the mounting portion 70. Furthermore, the inner bracket 66 is formed with notches 82, 82 opened at the front and rear outer end portions of the defined stepped surfaces 80, 80, respectively. Each defined step surface 80 is a stepped surface having a step in the middle portion in the front and rear direction by the notch 82, and the front and rear outer end portion in which the notch 82 is formed is closer to the front and rear inner end portion outside the notch 82 Is also located on the left. Although it is desirable that the prescribed step surface 80 be substantially orthogonal to the left-right direction, which is the press-fitting direction of the inner bracket 66 into the cylindrical portion 20 described later, it is inclined to intersect with the press-fitting direction. For example, it is not necessarily limited to the orthogonal.

  Furthermore, in the present embodiment, a stopper projection 84 projecting upward from the upper surface of the press-fit portion 68 is integrally formed at the end on the press-fit portion 68 side of the attachment portion 70 (the end on the right side in FIG. 4). It is done. The stopper projection 84 has a flat upper surface which spreads in the lateral direction, as shown in FIG. Furthermore, the mounting portion 70 is provided with a sloped portion 86 extending from the stopper protrusion 84 to the opposite side to the press-fit portion 68, and the sloped portion 86 has a tapered shape inclining downward as it separates from the stopper protrusion 84 ing. The end face (right end face) on the press-fit portion 68 side of the stopper projection 84 is located on substantially the same plane as the prescribed step faces 80, 80, and constitutes the right end face of the mounting portion 70 together with the prescribed step face 80. ing. Further, the upper concave groove 72, 72 and the lower concave groove 74, 74 formed in the press-fit portion 68 extend to the stopper projection 84, and the stopper projection 84 is the upper concave groove 72, 72 and the lower concave groove 74, 74. Are divided into a plurality by the front and back (see FIGS. 8 and 9).

  Then, as shown in FIG. 4, the inner bracket 66 is in the direction orthogonal to the mounting central axis with respect to the mounting hole 30 in which the press-fit portion 68 is provided on the inner periphery of the cylindrical portion 20 of the first mounting member 14. It is attached to the first attachment member 14 by press-fitting and fixing in the left-right direction. However, the press-in direction of the inner bracket 66 into the cylindrical portion 20 is not necessarily limited to the orthogonal direction as long as it is a direction (including the orthogonal direction) inclined with respect to the mount central axis. In the present embodiment, as shown in FIG. 6, the front and rear inner end portions of the prescribed step surfaces 80 and 80 of the inner bracket 66 abut on the left opening end face of the cylindrical portion 20, whereby the mounting hole 30 of the press-fit portion 68 is The inner bracket 66 is positioned relative to the first mounting member 14 in the press-fitting direction of the press-fit portion 68. In the present embodiment, as shown in FIG. 4, the right end surface of the stopper projection 84 in the inner bracket 66 also abuts on the left open end surface of the cylindrical portion 20. Further, the open end face of the cylindrical portion 20 is covered with a rubber layer integrally formed with the main rubber elastic body 18, and the inner bracket 66 is indirectly connected to the left open end face of the cylindrical portion 20 via the rubber layer. Are in contact with each other.

  Further, in the mounting state of the inner bracket 66 to the first mounting member 14, the mounting portion 70 of the inner bracket 66 integrally formed with the press-fit portion 68 has a left opening of the cylindrical portion 20 as shown in FIG. It protrudes to the left from. In the inner bracket 66, the press-fit portion 68 and the mounting portion 70 are arranged in series in the press-fitting direction of the inner bracket 66 into the first mounting member 14.

  Further, the inner bracket 66 is provided with a second stopper rubber 88. The second stopper rubber 88 is formed separately from the main rubber elastic body 18 and, as shown in FIG. 4 and FIGS. The unsprung 92 has a structure connected to each other at the front and rear ends by a high spring front 94 and a high spring back 96. The high spring upper portion 90 and the high spring lower portion 92 are both formed in the shape of a long plate in the left and right direction, and the high spring upper portion 90 is located above and to the right of the high spring lower portion 92. The high spring front portion 94 and the high spring rear portion 96 are respectively formed in a plate shape extending vertically and horizontally, and are thinner than the high spring upper portion 90 and the high spring lower portion 92, It is done. Further, as shown in FIG. 6, the high spring front portion 94 and the high spring rear portion 96 have right flat portions shaped like a substantially flat plate and linearly extend left and right, and the left portion goes to the left. In particular, the left portion of the high spring front portion 94 is largely inclined with respect to the lateral direction.

  Furthermore, the second stopper rubber 88 includes front and rear sandwiching portions 98, 98. The holding portion 98 is a plate extending vertically and backwardly and is integrally formed at the right end portion of the high spring upper portion 90, the high spring front portion 94 and the high spring rear portion 96, and extends in the front and rear direction. Further, the front and rear sandwiching portions 98, 98 are disposed apart from each other in the front and rear direction, and the press-fit portion 68 of the inner bracket 66 can be inserted between the sandwiching portions 98, 98.

  Further, the high spring upper portion 90 constituting the second stopper rubber 88 has a spring constant in the vertical direction larger than that of the low spring upper portion 38 constituting the first stopper rubber 32. Similarly, the high spring front 94 has a longitudinal spring constant greater than that of the low spring front 34, and the high spring rear 96 has a longitudinal spring constant greater than the low spring rear 36 There is. In short, the second stopper rubber 88 has a spring constant larger than that of the first stopper rubber 32 in the upper and lower portions. The spring constants of the first stopper rubber 32 and the second stopper rubber 88 referred to here are the stopper rubber contact where the first and second stopper rubbers 32, 88 are the pressure receiving surfaces on the second mounting member 16 side. A spring constant in a state where the second stopper rubber 88 does not contact the surface (described later), and a spring constant of the second stopper rubber 88 is larger than a spring constant of the first stopper rubber 32 in the non-operating state of external force. However, it is more preferable that the spring constant of the second stopper rubber 88 be the same even in the acting state of the external force (stopper load) in which the first and second stopper rubbers 32, 88 are in contact with the stopper rubber contact surface. The spring constant of one stopper rubber 32 is larger.

  In the present embodiment, the rubber hardness of the second stopper rubber 88 is larger than the rubber hardness of the first stopper rubber 32, and the spring constant of the second stopper rubber 88 is higher than that of the first stopper rubber 32. It is enlarged. Furthermore, each spring constant of the first stopper rubber 32 and the second stopper rubber 88 depends not only on the rubber hardness of the forming material but also on the shape and the rubber volume (thickness in the protruding direction) in the stopper abutting direction. Is also adjustable. In the present embodiment, the protruding height of the second stopper rubber 88 from the inner bracket 66 is smaller than the protruding height of the first stopper rubber 32 from the cylindrical portion 20, and the second stopper rubber 88 By making the first stopper rubber 32 thinner than the first stopper rubber 32, the spring constant of the second stopper rubber 88 is made larger than the spring constant of the first stopper rubber 32.

  More specifically, as shown in FIG. 6, the protruding height t of the high spring front 94 of the second stopper rubber 88 from the inner bracket 66 is the same as that of the low spring front 34 of the first stopper rubber 32. The high spring front 94 is thinner than the low spring front 34 so as to be smaller than the projection height T from the cylindrical portion 20, so that the spring constant of the high spring front 94 is low in the front-rear direction. The spring constant of the front part 34 is made larger. In the present embodiment, in the first stopper rubber 32, the height at which the low spring rear portion 36 protrudes from the cylindrical portion 20 is substantially the same as the height T at which the low spring front portion 34 protrudes. The protruding height of the high spring rear portion 96 from the inner bracket 66 in the stopper rubber 88 is substantially the same as the protruding height t of the high spring front portion 94, and the spring constant of the high spring rear portion 96 is low in the longitudinal direction. The spring constant of the rear portion 36 is made larger. Furthermore, as shown in FIG. 10, the protruding height t ′ of the high spring upper portion 90 of the second stopper rubber 88 from the inner bracket 66 is from the cylindrical portion 20 of the low spring upper portion 38 of the first stopper rubber 32. The spring constant of the high spring upper portion 90 in the vertical direction is higher than the spring constant of the low spring upper portion 38 by making the high spring upper portion 90 thinner than the low spring upper portion 38 by being smaller than the projection height T ′ of It is enlarged. As described above, the first stopper rubber 32 and the second stopper rubber 32 have a large thickness and the second stopper rubber 88 has a small thickness in each stopper direction described later. The shape of the stopper rubber 88 also makes it easy to set a relatively low spring constant for the first stopper rubber 32 and makes it easy to set a relatively high spring constant for the second stopper rubber 88. There is.

  The second stopper rubber 88 is attached to the right end portion of the attachment portion 70 of the inner bracket 66. That is, as shown in FIG. 4 and FIGS. 6-9, the inner bracket is in a region surrounded by the high spring upper portion 90, the high spring lower portion 92, the high spring front portion 94 and the high spring rear portion 96 in the second stopper rubber 88. 66 is inserted, and the second stopper rubber 88 is externally fitted to the inner bracket 66. In the mounted state of the second stopper rubber 88, the high spring upper portion 90 of the second stopper rubber 88 is superimposed on the upper surface of the stopper projection 84 of the mounting portion 70, and the high spring lower portion 92 from the inclined portion 86. The right side is also superimposed on the lower surface of the mounting portion 70. Then, based on the elasticity of the high spring front 94 and the high spring rear 96 superimposed on the front and rear sides of the mounting portion 70, the elastic clamping force in the mutual approaching direction between the high spring upper 90 and the high spring lower 92 is obtained. The second stopper rubber 88 is non-adhesively attached to the attachment portion 70 of the inner bracket 66. Thus, by attaching the second stopper rubber 88 to the inner bracket 66, the second stopper rubber 88 is provided on the surface in the multiple directions of the inner bracket 66. The second stopper rubber 88 is bonded to the inner bracket 66 by, for example, an adhesive being applied between the second stopper rubber 88 and the inner bracket 66 and being formed as an integrally vulcanized molded product having the inner bracket 66. The position of the second stopper rubber 88 relative to the inner bracket 66 can be advantageously prevented.

  Furthermore, in the inner bracket 66 attached to the cylindrical portion 20 of the first attachment member 14, the front and rear inner end portions of the defined stepped surfaces 80, 80 are on the left open end face of the cylindrical portion 20 of the first attachment member 14. The low spring front portion 34 of the first stopper rubber 32 which is in contact with the front and rear outer end portions of the defined stepped surfaces 80, 80 having the notches 82 formed therein, and which project forward and backward from the cylindrical portion 20 The low spring rear portion 36 is opposed to the left with a distance to the left. Then, the inner bracket 66 mounted with the second stopper rubber 88 is attached to the cylindrical portion 20 of the first attachment member 14, thereby overlapping the notches 82 and 82 of the inner bracket 66 as shown in FIG. The holding portions 98, 98 of the second stopper rubber 88 formed are the forming portions of the notches 82, 82 in the prescribed step surfaces 80, 80 of the inner bracket 66, and the low spring front and rear portions 34 of the first stopper rubber 32, It is sandwiched and supported on the left and right between the left end face of 36. As a result, the second stopper rubber 88 is positioned with respect to the inner bracket 66 and held at the initial mounting position, and the holding portions 98, 98 enter the notches 82, 82, thereby Stable clamping is realized.

  The second stopper rubber 88 mounted on the inner bracket 66 is disposed between the inner bracket 66 and the outer bracket 40 by mounting the inner bracket 66 on the first mounting member 14. That is, as shown in FIGS. 4 and 6, in the second stopper rubber 88, the high spring lower portion 92 is disposed between the facing surfaces of the inner bracket 66 and the bound receiving member 44 of the outer bracket 40, and The upper portion 90 and the high spring front and rear portions 94 and 96 are disposed between the facing surfaces of the mounting portion 70 of the inner bracket 66 and the upper receiving member 54 of the outer bracket 40.

  In addition, the second stopper rubber 88 is disposed to the left with respect to the first stopper rubber 32. That is, the high spring upper portion 90 of the second stopper rubber 88 is disposed on the left side of the low spring upper portion 38 of the first stopper rubber 32, as shown in FIG. Further, as shown in FIG. 6, the high spring front portions 94 of the second stopper rubber 88 are arranged side by side with respect to the low spring front portions 34 of the first stopper rubber 32. Furthermore, the high spring rear portions 96 of the second stopper rubber 88 are disposed side by side with respect to the low spring rear portions 36 of the first stopper rubber 32. In the present embodiment, the first stopper rubber 32 and the second stopper rubber 88 are disposed in contact with each other and adjacent to each other, but the first stopper rubber 32 and the second stopper rubber 88 They may be arranged side by side apart from each other.

  The engine mount 10 having such a structure is fixed to a power unit side member (not shown) with the inner bracket 66 fixed by a bolt (not shown) inserted through the bolt holes 76, 76 and 76 in a state where the pin 78 is inserted. As a result, the first mounting member 14 is attached to the power unit. Furthermore, the second mounting member 16 is fixed to the vehicle body side member (not shown) by means of bolts (not shown) inserted into the bolt holes 50 of the leg members 48, 48. Attached to

  In addition, since the shared supporting load of the power unit (not shown) is exerted between the first mounting member 14 and the second mounting member 16 in the vertical approaching direction when the engine mount 10 is mounted on the vehicle, as shown in FIG. As a result, the low spring upper portion 38 and the high spring upper portion 90 are both facing downward away from the upper wall portion 62 of the upper receiving member 54. Thereby, in the vehicle mounted state, the lower spring upper portion 38 of the first stopper rubber 32 and the high spring upper portion 90 of the second stopper rubber 88 abut on the outer bracket 40 (upper wall portion 62 of the upper receiving member 54) The upper surface of the high spring upper portion 90 is positioned lower than the upper surface of the low spring upper portion 38 of the first stopper rubber 32.

  Then, when vibration to be damped such as engine shake, idling vibration, running muddy noise or the like is input between the first mounting member 14 and the second mounting member 16 in the vehicle mounted state, the main rubber elastic body 18 is The anti-vibration effect is exhibited based on the energy attenuation action and the like exhibited at the time of elastic deformation.

  In addition, when a load larger than normal input vibration is input between the first attachment member 14 and the second attachment member 16, the relative displacement of the first attachment member 14 and the second attachment member 16, In other words, the amount of elastic deformation of the main rubber elastic body 18 is reduced by the bound stopper, the rebound stopper, and the front and rear stoppers.

  That is, in the engine mount 10, the bound stopper for limiting the relative displacement of the first attachment member 14 and the second attachment member 16 in the approaching direction is the attachment portion 70 of the inner bracket 66 and the bound receiving member 44 of the outer bracket 40. Are brought into contact with each other via the high-spring lower portion 92 of the second stopper rubber 88. Thereby, the amount of vertical displacement of the first attachment member 14 and the second attachment member 16 is limited by the stopper action of the bound stopper. The pressure receiving surface of the bound stopper is configured such that the first mounting member 14 side is the lower surface of the inner bracket 66, and the second mounting member 16 side is the upper surface of the bound receiving member 44 of the outer bracket 40. When the pressure receiving surfaces abut indirectly via the second stopper rubber 88, the stopper action of the bound stopper is exhibited, and the amount of elastic deformation of the main rubber elastic body 18 is limited.

  Further, in the engine mount 10, the rebound stopper for limiting the amount of relative displacement between the first mounting member 14 and the second mounting member 16 in the vertical separation direction is the cylindrical portion 20 of the first mounting member 14 and the outer bracket 40. The upper receiving member 54 abuts on the lower spring upper portion 38 of the first stopper rubber 32 and the high spring upper portion 90 of the second stopper rubber 88. Thereby, the amount of vertical displacement of the first attachment member 14 and the second attachment member 16 is limited by the stopper action of the rebound stopper, and the amount of elastic deformation of the main rubber elastic body 18 is limited.

As understood from the above description, the pressure receiving surface on the first attachment member 14 side of the rebound stopper is the upper wall of the cylindrical portion 20 of the first attachment member 14 covered with the first stopper rubber 32. It is constituted by the outer surface and the upper wall surface of the inner bracket 66 covered with the second stopper rubber 88. On the other hand, the pressure receiving surface on the second attachment member 16 side of the rebound stopper is formed by the lower surface of the upper wall portion 62 of the upper receiving member 54 of the outer bracket 40. Then, the pressure receiving surfaces indirectly contact with each other via the first stopper rubber 32 and the second stopper rubber 88, whereby the stopper function of the rebound stopper is exhibited. In the rebound stopper, the stopper rubber abutting surface 100 with which the first stopper rubber 32 and the second stopper rubber 88 abut by the relative displacement of the first mounting member 14 and the second mounting member 16 is the second one. The amount of deformation of the main rubber elastic body 18 is limited by the contact between the first and second stopper rubbers 32, 88 and the stopper rubber abutting surface 100.

  In the engine mount 10, front and rear stoppers for limiting the relative displacement of the first mounting member 14 and the second mounting member 16 in the front-rear direction are the cylindrical portion 20 of the first mounting member 14 and the outer bracket 40. The upper receiving member 54 is constituted by abutting through the low spring front 34 or the low spring rear 36 of the first stopper rubber 32 and the high spring front 94 or the high spring rear 96 of the second stopper rubber 88 ing. Thereby, the front-back relative displacement amount of the 1st attachment member 14 and the 2nd attachment member 16 is restrict | limited by the stopper effect | action of a back-and-front stopper, and the elastic deformation amount of the main body rubber elastic body 18 is limited.

As understood from the above description, the pressure receiving surface on the first mounting member 14 side of the front and rear stoppers is the front and rear outside of the cylindrical portion 20 of the first mounting member 14 covered with the first stopper rubber 32. A wall surface and front and rear wall surfaces of an inner bracket 66 covered with a second stopper rubber 88 are formed. On the other hand, the pressure receiving surface on the second mounting member 16 side of the front and rear stoppers is formed by the front and rear inner surfaces of the front and rear side wall portions 56 and 58 of the upper receiving member 54 of the outer bracket 40. Then, the pressure receiving surfaces indirectly contact each other via the first stopper rubber 32 and the second stopper rubber 88, whereby the stopper action of the front and rear stoppers is exhibited. In the front and rear stoppers, the stopper rubber abutting surface 102 on which the first stopper rubber 32 and the second stopper rubber 88 abut by the relative displacement of the first mounting member 14 and the second mounting member 16 is the second The amount of deformation of the main rubber elastic body 18 is limited by the contact between the first and second stopper rubbers 32, 88 and the stopper rubber abutting surface 102.

  In the present embodiment, the high spring front portion 94 of the second stopper rubber 88 spreads by being inclined forward and backward with respect to the left and right direction which is the press-fitting direction of the inner bracket 66 into the cylindrical portion 20. Is inserted between the facing surfaces of the mounting portion 70 of the inner bracket 66 and the reinforcing rib 64 of the upper receiving member 54 of the outer bracket 40 (see FIG. 6). Thus, the right stopper that limits the amount of relative displacement of the first mounting member 14 to the right with respect to the second mounting member 16 is configured by the abutment of the mounting portion 70 and the reinforcing rib 64. The buffer action by the second stopper rubber 88 is exhibited.

  Further, in the front and rear stopper and the rebound stopper which are stoppers in the present embodiment, both the first stopper rubber 32 and the second stopper rubber 88 are disposed, and the cylindrical portion 20 of the first mounting member 14 and The mounting portion 70 of the inner bracket 66 abuts against the upper receiving member 54 of the outer bracket 40 via the first stopper rubber 32 and the second stopper rubber 88 arranged side by side on the left and right. There is. Here, in the front and rear stoppers and the rebound stopper, the first stopper rubber 32 having a small spring constant is arranged closer to the stopper rubber contact surfaces 100 and 102 of the outer bracket 40 than the second stopper rubber 88. Thus, the stopper rubber contact surfaces 100 and 102 of the outer bracket 40 come into contact first.

That is, as shown in FIG. 6, the front and rear of the low spring front portion 34 of the first stopper rubber 32 and the front side wall portion 56 (the stopper rubber abutting surface 102 of the front stopper) of the upper receiving member 54 of the outer bracket 40 The distance d _f is smaller than the distance D _f between the high spring front portion 94 of the second stopper rubber 88 and the front side wall portion 56 (d _f <D _f ). In short, the low spring front portion 34 of the first stopper rubber 32 is provided closer to the front side wall 56 than the high spring front portion 94 of the second stopper rubber 88 in the front-rear direction.

Further, the distance d _r between the front and rear of the low spring rear portion 36 of the first stopper rubber 32 and the rear side wall portion 58 (the stopper rubber abutting surface 102 of the rear stopper) of the upper receiving member 54 of the outer bracket 40 is second Is smaller than the distance D _r between the high spring rear portion 96 of the stopper rubber 88 and the rear side wall portion 58 (d _r <D _r ). In short, the low spring rear portion 36 of the first stopper rubber 32 is provided closer to the rear side wall portion 58 than the high spring rear portion 96 of the second stopper rubber 88 in the front-rear direction.

  When the first mounting member 14 and the second mounting member 16 are displaced relative to the front and rear, the first stopper rubber 32 is closer to the front side wall portion 56 and the rear side wall portion 58 than the second stopper rubber 88. Contact first. As a result, in the front and rear stoppers, the excellent cushioning action by the first stopper rubber 32 having a small spring constant is preferentially exerted to reduce the shock and striking noise at the initial stage of the contact. Moreover, when the relative displacement between the first mounting member 14 and the second mounting member 16 increases, the second stopper rubber 88 having a large spring constant abuts on the outer bracket 40 together with the first stopper rubber 32. Since a more effective stopper action is exhibited, the amount of elastic deformation of the main rubber elastic body 18 and the first stopper rubber 32 is limited, and the durability can be improved.

Similarly, as shown in FIG. 10, the lower spring upper portion 38 of the first stopper rubber 32 and the upper and lower portions 62 of the upper receiving member 54 of the outer bracket 40 (the stopper rubber abutting surface 100 of the rebound stopper) The distance d _u is smaller than the distance D _u between the upper spring portion 90 of the second stopper rubber 88 and the upper wall portion 62 (d _u <d _u ). In short, the low spring upper portion 38 of the first stopper rubber 32 is provided closer to the upper wall portion 62 than the high spring upper portion 90 of the second stopper rubber 88 in the vertical direction.

  Then, when the first attachment member 14 and the second attachment member 16 are displaced up and down, the first stopper rubber 32 abuts the upper wall portion 62 earlier than the second stopper rubber 88. Therefore, in the rebound stopper, the excellent cushioning action by the first stopper rubber 32 having a small spring constant is preferentially exerted to reduce the shock and the hitting sound in the initial stage of the abutment. Moreover, when the amount of vertical displacement of the first mounting member 14 and the second mounting member 16 increases, the second stopper rubber 88 having a large spring constant abuts on the outer bracket 40 together with the first stopper rubber 32. Since a more effective stopper action is exhibited, the amount of elastic deformation of the main rubber elastic body 18 and the first stopper rubber 32 is limited, and the durability can be improved.

  Thus, in the front and rear stoppers and the rebound stopper, the first stopper rubber 32 and the second stopper rubber 88 having different spring constants are disposed between the pressure receiving surfaces, and the first stopper rubber having a small spring constant 32 is closer to the outer bracket 40 than the second stopper rubber 88. Therefore, by the stepwise abutment of the first stopper rubber 32 and the second stopper rubber 88, both the excellent cushioning action at the initial stage of stopper abutment and the effective stopper action against a large load are made compatible. It can be realized.

  Furthermore, in the present embodiment, in the front and rear stoppers and the rebound stopper, the tip end surface of the first stopper rubber 32 is positioned so as to project closer to the upper receiving member 54 than the tip end surface of the second stopper rubber 88. Therefore, while the opposing surfaces of the upper receiving member 54 with the first stopper rubber 32 and the second stopper rubber 88 have a simple planar shape, the first stopper rubber 32 is more than the second stopper rubber 88. It can be disposed close to the upper receiving member 54.

  Further, in the present embodiment, the rubber hardness of the second stopper rubber 88 is made larger than the rubber hardness of the first stopper rubber 32, and the low spring front and rear portions 34, 36 and the low in the first stopper rubber 32 are low. The projecting dimension of the spring top 38 from the first attachment member 14 is larger than the projecting dimension of the second stopper rubber 88 from the high spring front and rear portions 94 and 96 and the high spring top 90 from the inner bracket 66. Thus, the spring constant of the second stopper rubber 88 is set larger than the spring constant of the first stopper rubber 32.

  In addition, since the first stopper rubber 32 having a small spring constant is integrally formed with the main rubber elastic body 18, the main rubber elastic body can obtain a shock absorbing stopper action against a relatively small load with a small number of parts. It is possible to realize 18 excellent vibration isolation performance. Furthermore, since the second stopper rubber 88 having a large spring constant is separated from the main rubber elastic body 18, the second stopper rubber 88 does not adversely affect the anti-vibration performance of the main rubber elastic body 18. It is possible to highly realize high load resistance, durability against repetitive input, and the like, which are characteristics required for 88.

  Although the embodiments of the present invention have been described above in detail, the present invention is not limited by the specific description. For example, the first stopper rubber 32 is not necessarily limited to one that constitutes a stopper in a plurality of directions, and may have a structure that constitutes only a stopper in one direction. Similarly, the second stopper rubber 88 may not constitute a stopper in a plurality of directions, and may constitute only a stopper in one direction. Further, the stoppers on which the first stopper rubber 32 and the second stopper rubber 88 are disposed side by side on the contact surface may be only the rebound stopper or only the front and rear stoppers.

  In addition, if the first stopper rubber 32 is closer to the stopper rubber contact surface (inner surface of the wall of the upper receiving member 54) than the second stopper rubber 88, the protruding tip of the first stopper rubber 32 and the second stopper rubber 32 The protruding tips of the stopper rubbers 88 may be set on the same plane. That is, the stopper rubber contact surface, which is the pressure receiving surface on the second mounting member 16 side, is made to be a stepped surface or the like, and the stopper rubber contact surface is first compared to the protruding tip of the second stopper rubber 88 It can also be made close to the protruding end of the stopper rubber 32.

  In the above embodiment, the low spring front portion 34, the low spring rear portion 36 and the low spring upper portion 38 are all integrally formed with the main rubber elastic body 18 to constitute the first stopper rubber 32. At least one is integrally formed with the main rubber elastic body 18 to constitute the first stopper rubber 32, and the other is formed separately from the main rubber elastic body 18 to provide multi-step buffer action and stopper action. You may make it exhibit in each direction. Furthermore, for example, a third stopper rubber having a spring constant larger than that of the second stopper rubber 88 is formed separately from the main rubber elastic body 18 and provided, and the second stopper rubber 88 is a third stopper rubber If it is arranged closer to the stopper rubber abutment surface, it may be possible to obtain more multi-step buffer action and stopper action.

  Further, the notches 82 and 82 of the prescribed step surfaces 80 and 80 which are the right end face of the inner bracket 66 are not essential and can be omitted, and, for example, the low spring front and rear portions 34 of the first stopper rubber 32 , 36 can be formed on the left end face, and the sandwiching portions 98, 98 of the second stopper rubber 88 can be sandwiched laterally between the notch and the prescribed stepped surface 80, 80.

  The specific structure of the inner bracket 66 and the outer bracket 40 is merely an example, and is not particularly limited. Furthermore, the outer bracket 40 may be omitted, for example, in the case of employing a second attachment member having a mounting structure to a vehicle body or a stopper rubber contact surface.

  Although the solid type mount body 12 which is not fluid-filled is illustrated in the above embodiment, in the present invention, the structure of the mount body can be appropriately changed according to the required vibration proof performance, the device size, etc. For example, a fluid-sealed mount body that utilizes a vibration damping effect based on the flow action of the incompressible fluid enclosed inside can also be employed.

  The scope of application of the present invention is not limited to engine mounts, and may be applied to subframe mounts, differential mounts, and the like. Furthermore, the vibration-damping device with a bracket according to the present invention is suitably applied to automobiles, and is also applicable to motorcycles, railway vehicles, industrial vehicles, and the like.

10: engine mount, 14: first mounting member, 16: second mounting member, 18: main rubber elastic body, 20: tubular portion, 32: first stopper rubber, 66: inner bracket (bracket), 80: Specified stepped surface, 88: Second stopper rubber, 98: Clamping portion

Claims (6)

The first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and the bracket is press-fitted and fixed to the tubular portion formed on the first mounting member side, and the main rubber In a bracketed vibration damping device provided with a stopper for limiting the amount of elastic deformation of an elastic body,
A first stopper rubber integrally formed with the main body rubber elastic body is provided on the first attachment member, and is formed separately from the main body rubber elastic body so that the spring is larger than the first stopper rubber. A second stopper rubber having a large constant is provided on the bracket, and the stopper is the first stopper rubber and the second stopper depending on the relative displacement of the first mounting member and the second mounting member. A stopper rubber contact surface is in contact with the rubber to limit the amount of elastic deformation of the main rubber elastic body, and in the stopper, the first stopper rubber is the stopper rubber rather than the second stopper rubber. An antivibration device with a bracket characterized in that it is in close proximity to a contact surface.   The first stopper rubber is provided in a plurality of directions on the circumference of the cylindrical portion, and the second stopper rubber is provided in a plurality of directions on the surface of the bracket, and the first stopper rubbers are provided. The bracketed anti-vibration device according to claim 1, wherein the stoppers are respectively configured in a plurality of directions in which the second rubber and the second stopper rubber are provided.   The bracketed anti-vibration device according to claim 1 or 2, wherein the rubber hardness of the second stopper rubber is larger than the rubber hardness of the first stopper rubber. The bracket according to any one of claims 1 to 3, wherein a projecting dimension of the second stopper rubber from the bracket is smaller than a projecting dimension of the first stopper rubber from the cylindrical portion. Vibration isolation device.   The bracket is provided with a defined step surface which spreads in an inclined manner with respect to the press-fitting direction to the tubular portion, and the bracket is formed into the tubular portion by the contact between the defined step surface and the opening end face of the tubular portion. 5. The second stopper rubber according to claim 1, wherein the second stopper rubber is provided with a holding portion which is positioned between the predetermined step surface and the first stopper rubber. The vibration-damping device with a bracket according to any one of the preceding claims.   The prescribed stepped surface spreads on both sides of the bracket, and the inner ends on both sides of the prescribed stepped surface abut the opening end surface of the cylindrical portion, and the bracket is provided on both outer ends of the prescribed stepped surface. In the notch, the prescribed stepped surface faces away from the first stopper rubber, and both outer ends of the prescribed stepped surface in which the notch is formed. The bracketed anti-vibration device according to claim 5, wherein the holding portion of the second stopper rubber is sandwiched between the first stopper rubber and the first stopper rubber.