Anti-vibration device

Abstract

To provide an antivibration device capable of improving the durability of a bracket.SOLUTION: A second bracket 30 is mounted on the vehicle body side with a bolt 39 inserted into mounting holes 36a, 37a, 38b of the second bracket 30. By holding a plurality of continuous annular plates 38 between two mounting plates 36, 37 separating from each other in a vertical direction U-D, the mounting holes 36a, 37a, 38b are formed penetrating through mutually overlapping portions. Thus, a fastening portion of the second bracket 30 with the bolt 39 is thickened for higher rigidity to improve the durability of the second bracket 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration isolator, and more particularly to a vibration isolator that can improve the durability of a bracket. [Background technology]

[0002] The vibration-damping device includes a vibration-damping device main body in which a first member and a second member are connected by an elastic vibration-damping base, a first bracket to which the first member is fixed, and a second bracket to which the second member is fixed. The first bracket is attached to one of the vibration source (e.g., engine) side and the vibration receiver (e.g., vehicle body) side, and the second bracket is fastened to the other side with a fastening member. Vibration transmission between the vibration source side and the vibration receiver side is suppressed by the vibration-damping device.

[0003] For example, the second bracket disclosed in Patent Document 1 includes a cylindrical portion into which a cylindrical second member fits, a square tube portion whose upper end is joined to the outer peripheral surface and which surrounds the arm of the first bracket, and a pair of legs provided on both the left and right sides of the square tube portion. The legs are formed by bending a plate material into a roughly U-shape when viewed from the left and right, and vertical reinforcing plates rise from the bottom plate. The vertical reinforcing plates are joined to the side wall plates on both the left and right sides of the square tube portion. Fastening members are inserted into mounting holes formed through the bottom plate, and the second bracket is fastened to the vibration receiving side. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-7261 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional technology, only one portion of the second bracket is fastened to the vibration receiving side by the fastening member, namely the bottom plate, resulting in low rigidity at the fastening portion. Furthermore, if the bottom plate and the side wall plate are connected with vertical reinforcing plates that are perpendicular to both, the rigidity of the connecting portion may be insufficient to withstand lateral input from the first bracket to the second bracket. Thus, the above-mentioned conventional technology has the problem of low durability of the second bracket.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to provide a vibration-damping device that can improve the durability of the second bracket. [Means for solving the problem]

[0007] In order to achieve this object, the vibration-damping device of the present invention comprises: a vibration-damping device main body in which a first member and a second member are connected by a vibration-damping base made of an elastic material; a first bracket having an arm extending in a first direction to which the first member is fixed, the first bracket being attached to one of the vibration source side and the vibration receiving side; and a second bracket fastened to the other of the vibration source side and the vibration receiving side by a fastening member, the second bracket comprising: a fixing portion to which the second member is fixed, a first plate on which the fixing portion is provided, a second plate facing the first plate in a second direction perpendicular to the first direction, with the arm sandwiched between them; a pair of side wall plates facing each other with the arm sandwiched between them in a third direction perpendicular to the first direction and the second direction, and connecting the first plate and the second plate; a plurality of mounting plates each extending from the side wall plates in the third direction and arranged apart from each other in the second direction; and a spacer sandwiched in the second direction between the plurality of mounting plates, and a mounting hole through which the fastening member is inserted is formed in the second direction at the portion where the mounting plate and the spacer overlap each other. [Effects of the Invention]

[0008] According to the vibration-damping device of claim 1, the second bracket is attached to the other of the vibration source side and the vibration receiver side by fastening members inserted into the mounting holes of the second bracket. The mounting holes are formed through the overlapping portions of multiple mounting plates spaced apart in the second direction by sandwiching a spacer between them. This allows the portions of the second bracket fastened by the fastening members to be thickened, thereby increasing rigidity.

[0009] Furthermore, the mounting plate extends in the third direction from a pair of side wall plates that face each other with the arm of the first bracket sandwiched between them in the third direction. As a result, when an input in the third direction is applied from the first bracket to the second bracket, the mounting plate is stretched substantially straight against the input between the fastening member and the side wall plates. This improves the rigidity of the second bracket against input in the third direction. As a result, the durability of the second bracket can be improved.

[0010] The vibration-damping device of claim 2 achieves the following effect in addition to the effect achieved by the vibration-damping device of claim 1. At least one of the multiple mounting plates spaced apart in the second direction is positioned so as to overlap the arm when viewed from the third direction. This ensures that even if an input in the third direction deforms the vibration-damping base and presses the arm against the side wall plate, the mounting plate is stretched substantially straight between the arm and the fastening member. As a result, the rigidity of the second bracket against an input in the third direction can be further improved, and the durability of the second bracket can be further improved.

[0011] The vibration-damping device of claim 3 achieves the following effect in addition to the effect achieved by the vibration-damping device of claim 1. The first plate and the side wall plate are connected at a curved corner where their edges are connected. The fixing portion, formed in a cylindrical or elliptical cylindrical shape into which the second member fits, protrudes from the first plate and the corner toward the opposite side from the second plate. The dimension of the connecting portion between the fixing portion and the corner in the first direction decreases as it approaches the side wall plate. By narrowing the connecting portion as it approaches the side wall plate in this way, the rigidity in the vicinity of the connecting portion can be improved.

[0012] The vibration-damping device of claim 4 achieves the following effect in addition to the effect achieved by the vibration-damping device of claim 1. The second bracket includes a vertical reinforcing plate that rises vertically from the side wall plate and the mounting plate. This makes it difficult for the side wall plate to fall toward the mounting plate when a force in the third direction is applied to the second bracket. In this way, the vertical reinforcing plate improves the rigidity of the second bracket, thereby further improving durability.

[0013] The vibration-damping device of claim 5 achieves the following effect in addition to the effect achieved by the vibration-damping device of any one of claims 1 to 4. The spacer is formed by stacking multiple annular plates, each with a mounting hole in the center, in the second direction. Compared to a spacer made of a single cylindrical body, annular plates are easier to manufacture at low cost by punching out a plate material, for example. Also, the distance between the mounting plates can be easily adjusted by adjusting the number of stacked annular plates.

[0014] The vibration-damping device of claim 6 achieves the following effect in addition to the effect achieved by the vibration-damping device of claim 5. A plurality of mounting holes are provided in the mounting plate. Annular plates spaced apart in at least one of the first direction and the third direction are connected to each other by connecting portions so as to correspond to the plurality of mounting holes, thereby forming a continuous ring plate. A plurality of such continuous ring plates are stacked in the second direction to form a spacer. Therefore, the number of parts constituting the spacer can be reduced compared to when there are no connecting portions.

[0015] The vibration-damping device of claim 7 achieves the following effect in addition to the effect achieved by the vibration-damping device of claim 6. The connecting portions overlapping in the second direction are joined to each other and to the mounting plate. By separating these joints from the vicinity of the mounting holes, i.e., from the areas where the axial force of the fastening members acts, it is possible to prevent shape changes caused by the joints from affecting the axial force of the fastening members. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a vibration isolation device according to a first embodiment. [Figure 2] FIG. [Figure 3] 3 is a cross-sectional view of the vibration-damping device taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is an exploded perspective view of the second bracket. [Figure 5] FIG. 10 is a perspective view of a vibration isolation device according to a second embodiment. [Figure 6] FIG. 10 is a perspective view of a vibration isolation device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Preferred embodiments will now be described with reference to the accompanying drawings. Fig. 1 is a perspective view of an anti-vibration device 10 in a first embodiment. Fig. 2 is a cross-sectional view of the anti-vibration device 10. Fig. 3 is a cross-sectional view of the anti-vibration device 10 taken along line III-III in Fig. 2. Fig. 4 is an exploded perspective view of a second bracket 30.

[0018] In the following description, the upper side of the paper in FIG. 2 is referred to as the upward direction U of the vibration damping device 10, and similarly, the lower side of the paper is referred to as the downward direction D, the left side of the paper as the forward direction F, the right side of the paper as the rearward direction B, the front side of the paper as the leftward direction L, and the back side of the paper as the rightward direction R. The up-down direction UD (second direction), the fore-aft direction FB (first direction), and the left-right direction LR (third direction) are perpendicular to one another. The up-down direction UD of the vibration damping device 10 does not necessarily coincide with the up-down direction of the vehicle on which the vibration damping device 10 is mounted. For example, the up-down direction of the vibration damping device 10 may coincide with the downward direction of the vehicle, or the left-right direction of the vibration damping device 10 may coincide with the up-down direction of the vehicle. Furthermore, these directions are the same in the second and third embodiments.

[0019] 1, the vibration damping device 10 is an engine mount that elastically supports the engine of a vehicle. The vibration damping device 10 includes a first bracket 11 attached to the engine (vibration source) side, a vibration damping device main body 20 fixed to the first bracket 11, and a second bracket 30 attached to the vehicle body (vibration receiver) side to which the vibration damping device main body 20 is fixed.

[0020] 1 and 2, the first bracket 11 is a metal member including a base 12 and an arm 15. The base 12 is a thick plate-like portion perpendicular to the front-to-rear direction FB, and has a plurality of through holes 13 formed therethrough. The first bracket 11 is attached to the engine side by bolts 14 inserted into the through holes 13.

[0021] The arm 15 is a generally square rod-shaped part extending from the base 12 in the forward direction F. The upper and lower surfaces of the arm 15 are each perpendicular to the up-down direction UD, and the left and right surfaces of the arm 15 are each perpendicular to the left-right direction LR. The arm 15 is covered (top, bottom, left, and right) with a buffer 18 made of an elastic material (e.g., rubber). A through-hole 16 into which a bolt 17 is inserted is formed in the tip of the arm 15 in the forward direction F, penetrating in the up-down direction UD.

[0022] The vibration-damping device main body 20 comprises an axial first member 21, a cylindrical second member 22 that surrounds the first member 21, and an elastic vibration-damping base 23 that connects them. The first member 21 is a boss metal fitting formed along an axis C that is parallel to the up-down direction UD. The cross-sectional view of Figure 2 shows a cross section of the vibration-damping device 10 that includes this axis C and is perpendicular to the left-right direction LR.

[0023] A bolt hole 21a into which the bolt 17 is fastened is formed along the axis C at the lower end of the first member 21. By fastening the bolt 17 inserted into the through hole 16 of the arm 15 to the bolt hole 21a, the first member 21 protrudes in the upward direction U from the tip of the arm 15, and the first member 21 is fixed to the arm 15.

[0024] The second member 22 is a substantially cylindrical member centered on the axis C, and is made mainly of a metal such as steel. The second member 22 is disposed offset in the upward direction U with respect to the first member 21. The second member 22 is formed in a conical cylindrical shape with its central portion in the up-down direction UD gradually decreasing in inner and outer diameter as it extends in the upward direction U. The second member 22 has a cylindrical portion with an upper end portion that is smaller in inner and outer diameter than the cylindrical portion below the central portion.

[0025] The vibration-isolating base 23 is a member made of an elastic material such as rubber or thermoplastic elastomer, and is formed in a generally upside-down umbrella shape. The vibration-isolating base 23 is vulcanization-bonded to the outer circumferential surface of the first member 21 and the inner circumferential surface of the second member 22 over the entire periphery, connecting them together.

[0026] Vibrations are mainly input in the left-right direction LR to the vibration isolation device 10. This input elastically deforms the vibration isolation base 23, causing the first bracket 11 and the first member 21 to move (vibrate) in the left-right direction LR relative to the second bracket 30 and the second member 22.

[0027] The second bracket 30 includes a fixing portion 31, a first plate 32, a second plate 33, a pair of side wall plates 34, a plurality of mounting plates 36, 37, and a plurality of ring plates 38. Each of these portions of the second bracket 30 is formed by punching, bending, or the like, a plate material such as a steel plate.

[0028] The fixed portion 31 is a generally cylindrical portion centered on the axis C. The lower end side of the second member 22 is press-fitted into the fixed portion 31. The first plate 32 is a generally flat plate-shaped portion that protrudes radially outward from the entire circumference of the lower end of the fixed portion 31. The first plate 32 is formed perpendicular to the up-down direction UD. The first plate 32 is located above the arm 15.

[0029] The second plate 33 is a generally flat plate-shaped portion that is perpendicular to the up-down direction UD. The second plate 33 is located below the arm 15. The first plate 32 and the second plate 33 face each other in the up-down direction UD, sandwiching the arm 15 therebetween. The second plate 33 has a through-hole 33a formed at a position where the bolt 17 can be seen when viewed from the downward direction D. This allows a tool to be inserted through the hole 33a to turn the bolt 17, with the vibration isolation device main body 20 attached to the second bracket 30, to fix or release the first member 21 of the vibration isolation device main body 20 to the arm 15.

[0030] 1 and 3, each of the pair of side wall plates 34 is a substantially flat plate-shaped portion perpendicular to the left-right direction LR. The pair of side wall plates 34 face each other in the left-right direction LR, sandwiching the arm 15 therebetween. Upper edges of the pair of side wall plates 34 are connected to the left and right edges of the first plate 32, respectively, and lower edges of the pair of side wall plates 34 are connected to the left and right edges of the second plate 33, respectively.

[0031] The first plate 32, second plate 33, and pair of side wall plates 34 form a cylindrical body that surrounds the arm 15 of the first bracket 11. Each part of this cylindrical body restricts the relative movement of the first bracket 11 in the up-down direction UD and the left-right direction LR with respect to the second bracket 30. In addition, buffers 18 provided on both the top and bottom surfaces of the arm 15 buffer collisions between the arm 15 and each part of the cylindrical body.

[0032] The fixing portion 31, the first plate 32, and the pair of side wall plates 34 are formed from a single steel plate (plate material). As a specific manufacturing method, for example, first, both the left and right sides of a single steel plate are bent substantially vertically in a downward direction D to form the first plate 32 and the pair of side wall plates 34. Thereafter, a hole provided in the center of the first plate 32 is widened, and the fixing portion 31 is formed by drawing, in which the periphery of the hole is bent in an upward direction U.

[0033] The edges of the first plate 32 and the side wall plates 34 formed in this manner are connected by curved corners 35. The outer diameter of the fixing portion 31 is approximately the same as the distance between the left and right outer surfaces of the pair of side wall plates 34. Therefore, the fixing portion 31 protrudes in the upward direction U not only from the portion of the first plate 32 perpendicular to the up-down direction UD but also from the corners 35.

[0034] The connection portion between the cylindrical fixing portion 31, whose outer circumferential surface is a curved surface, and the curved corner portion 35 has a curved surface whose orientation differs by 90°, and therefore the dimension in the front-to-rear direction FB decreases toward the side wall plate 34. By narrowing the connection portion toward the side wall plate 34 in this way, the rigidity in the vicinity of the connection portion can be improved.

[0035] 1 and 4, the mounting plates 36 are generally flat plate-shaped portions that extend from the second plate 33 in the left-right direction LR, and are provided in pairs on the left and right. Although the dimensions of the mounting plates 36 differ on the left and right sides, the same reference numerals are used for both to simplify the explanation. This simplification also applies to the mounting plate 37.

[0036] Two mounting holes 36a penetrating the mounting plate 36 in the up-down direction UD are formed spaced apart in the front-to-rear direction FB. The corners where the left and right inner edges of the pair of mounting plates 36 meet the lower edges of the side wall plates 34 are welded over substantially the entire length in the front-to-rear direction FB, forming weld beads 40. This connects the second plate 33, which is an integrally molded part with the mounting plate 36, to the side wall plate 34. The mounting plate 36 also projects vertically from the side wall plate 34 in the left-to-right direction LR.

[0037] The mounting plates 37 are flat plate-like portions of the mounting plate 36 that are spaced apart in the upward direction U, and are provided in a pair on the left and right. The mounting plates 37 are formed to have the same shape and dimensions as the opposing mounting plate 36 in the up-down direction UD. That is, the mounting plates 37 have mounting holes 37a formed therethrough at positions corresponding to the mounting holes 36a of the mounting plate 36.

[0038] The left and right inner edges of the mounting plate 37 are welded to the side wall plate 34 over substantially the entire length in the front-to-rear direction FB, and this welding forms weld beads 41. As a result, the mounting plate 37 protrudes perpendicularly in the left-to-right direction LR from the side wall plate 34. The mounting plates 36 and 37 are also arranged parallel to each other.

[0039] The ring plate 38 is a plate-like member formed by punching out a steel plate. The ring plate 38 includes annular plates 38a provided at both ends in the front-to-rear direction FB, and a connecting portion 38c connecting the two ring plates 38a together.

[0040] The annular plate 38a is an annular portion with a mounting hole 38b formed in the center. The inner diameter of the mounting hole 38b is approximately the same as the inner diameter of the mounting holes 36a, 37a of the mounting plates 36, 37. The dimension of the connecting portion 38c in the front-to-rear direction FB is set so that the distance between the two mounting holes 36a, 37a, which are spaced apart in the front-to-rear direction FB, is the same as the distance between the mounting holes 38b of the two annular plates 38a.

[0041] A spacer formed by stacking a plurality of (four in this embodiment) ring plates 38 in the up-down direction UD is sandwiched between the mounting plates 36 and 37. Mounting holes 36a, 37a, and 38b are formed through the portions where the mounting plates 36, 37 and the ring plates 38 (spacers) overlap so as to be continuous in the up-down direction UD.

[0042] To manufacture the second bracket 30, first, each part, such as the fixing portion 31 and the link plates 38, is formed by punching and bending a steel plate (plate material). Next, the side wall plate 34 is welded to the second plate 33 and the mounting plate 36. Next, the multiple link plates 38 are stacked on the mounting plate 36 while aligning the positions of the mounting holes 36a and 38b. Next, the mounting plate 37 is stacked on top of the link plates 38 while aligning the positions of the mounting holes 37a and 38b. Next, the mounting plate 37 is welded to the side wall plate 34. Finally, to prevent misalignment of the stacked portions before inserting the bolts 39, weld beads 42 are formed by welding the connecting portions 38c of the multiple link plates 38 to each other and to the connecting portions 38c and the mounting plates 36 and 37.

[0043] According to the vibration-damping device 10 described above, the second bracket 30 is fastened to the vehicle body by attaching the bolts 39 inserted into the mounting holes 36a, 37a, and 38b of the second bracket 30 to the vehicle body. This fastening portion is thickened by the overlap of the mounting plates 36 and 37 and the annular plate 38a. As a result, the fastening portion of the second bracket 30 can be made more rigid, and the durability of the second bracket 30 can be improved.

[0044] Note that a single cylindrical body (for example, the spacer 52 of the second embodiment) may be used as the spacer sandwiched between the mounting plates 36, 37 instead of the stacked annular plates 38a. However, using the annular plates 38a makes it easier to adjust the distance between the mounting plates 36, 37 by adjusting the number of stacked annular plates 38a. In addition, the annular plates 38a can be easily manufactured at low cost by, for example, stamping out a steel plate.

[0045] Furthermore, the mounting plates 36, 37 for increasing the rigidity of the fastening portion with the bolts 39, as well as the annular plate 38a, can also be formed by stamping from steel plate, eliminating the need for bending or drawing. Therefore, the structure for increasing the rigidity of the fastening portion can be manufactured more easily and at lower cost.

[0046] Furthermore, the connecting portions 38c may be omitted when multiple annular plates 38a (spacers) are sandwiched between the mounting plates 36, 37. However, the number of parts constituting the spacer can be reduced when the spacer has the connecting portions 38c compared to when the spacer does not have the connecting portions 38c.

[0047] Furthermore, by providing this connecting portion 38c, the weld bead 42 can be formed on the connecting portion 38c. This eliminates the need to form (weld) a weld bead 42 on each of the multiple stacked annular plates 38a, thereby reducing the number of welding operations. In addition, the weld bead 42 can be spaced away from the vicinity of the mounting holes 36a, 37a, and 38b (annular plate 38a, etc.) where the axial force from the bolt 39 acts. As a result, it is possible to prevent deformation due to welding, such as the weld bead 42 causing a portion of the vicinity of the mounting holes 36a, 37a, and 38b to bulge, from affecting the axial force of the bolt 39. In other words, by forming the weld bead 42 on the connecting portion 38c, it is possible to make it difficult for the axial force of the bolt 39 to decrease.

[0048] When an input in the left-right direction LR is applied from the first bracket 11 to the second bracket 30, the mounting plates 36, 37 are stretched substantially straight against the input between the bolt 39 and the side wall plate 34. This improves the rigidity of the second bracket 30 against the input in the left-right direction LR, thereby improving the durability of the second bracket 30.

[0049] 3, the mounting plate 37 is positioned so as to overlap the portion of the arm 15 covered by the buffer 18 when viewed in the left-right direction. As a result, when the vibration-isolating base 23 is deformed by input in the left-right direction LR and the arm 15 is pressed against the side wall plate 34 via the buffer 18, the mounting plate 37 is stretched substantially straight between the arm 15 and the bolt 39. As a result, the rigidity of the second bracket 30 against input in the left-right direction LR can be further improved, and the durability of the second bracket 30 can be further improved.

[0050] Furthermore, when viewed in the left-right direction, it is preferable that the mounting plate 37 overlaps the central portion in the up-down direction UD of the portion of the arm 15 covered by the buffer 18. This central portion is, for example, a portion that is 25% to 75% of the area when the upper surface of the arm 15 is 0% and the lower surface is 100%. In this case, the mounting plate 37 is located approximately in the center of the area where the second bracket 30 mainly receives a load from the arm 15 when input is made in the left-right direction LR. As a result, the tensioning effect of the mounting plate 37 can be improved, and the durability of the second bracket 30 can be further improved.

[0051] Next, a second embodiment will be described with reference to Fig. 5. In the first embodiment, a spacer formed by stacking a plurality of ring plates 38 is sandwiched between the mounting plates 36 and 37. In contrast, in the second embodiment, a cylindrical spacer 52 is sandwiched between the mounting plates 36 and 37. Note that the same parts as in the first embodiment are given the same reference numerals, and the following description will be omitted.

[0052] 5 is a perspective view of a vibration-damping device 50 according to the second embodiment. The second bracket 51 of the vibration-damping device 50 includes a fixing portion 31, a first plate 32, a second plate 33, a pair of side wall plates 34, a plurality of mounting plates 36 and 37, a plurality of spacers 52, and a plurality of vertical reinforcing plates 53.

[0053] The spacer 52 is a cylindrical body having mounting holes formed along the axis, into which the bolts 39 are inserted. In other words, the spacer 52 is the same as the spacer formed by integrally molding the multiple annular plates 38a of the first embodiment stacked on top of each other.

[0054] This spacer 52 is sandwiched between the mounting plates 36 and 37 at the positions of the multiple mounting holes 36a and 37a, respectively. As a result, similar to the first embodiment, the portion of the second bracket 51 fastened by the bolts 39 can be made highly rigid, and the durability of the second bracket 51 can be improved.

[0055] Furthermore, since the spacer 52 sandwiched between the mounting plates 36, 37 is made up of a single cylinder, the number of parts constituting the spacer 52 can be reduced compared to the spacer (multiple annular plates 38a) of the first embodiment. Furthermore, since the second embodiment does not have the connecting portion 38c that connects spacers 52 separated in the front-rear direction FB as in the first embodiment, the shape of the spacer 52 can be simplified. As a result, the manufacturing cost of the spacer 52 can be easily reduced.

[0056] The vertical reinforcing plates 53 are generally triangular plate members that rise vertically from the side wall plates 34 and the mounting plate 37. A plurality of vertical reinforcing plates 53 are arranged on both sides of the left-right direction LR, spaced apart in the front-rear direction FB.

[0057] The edges of the vertical reinforcing plates 53 and the corners of the side wall plates 34 are welded together over approximately the entire length in the up-down direction UD, forming weld beads 54. Furthermore, the edges of the vertical reinforcing plates 53 and the corners of the mounting plates 37 are welded together over approximately the entire length in the left-right direction LR, forming weld beads 55.

[0058] The vertical reinforcing plate 53 makes it difficult for the side wall plate 34 to fall toward the mounting plate 37 when an input is applied from the first bracket 11 to the second bracket 51 in the left-right direction LR. In this way, the vertical reinforcing plate 53 can further improve the rigidity of the second bracket 51.

[0059] Next, a third embodiment will be described with reference to Fig. 6. In the first embodiment, a case where a plurality of continuous ring plates 38 are sandwiched between two mounting plates 36, 37 spaced apart in the up-down direction UD is described. In contrast, in the third embodiment, a case where a plurality of annular plates 65 are sandwiched between three mounting plates 36, 37, 62 spaced apart in the up-down direction UD is described. Note that the same parts as in the first embodiment are given the same reference numerals, and the following description will be omitted.

[0060] 6 is a perspective view of a vibration-damping device 60 according to the third embodiment. The second bracket 61 of the vibration-damping device 60 includes a fixing portion 31, a first plate 32, a second plate 33, a pair of side wall plates 34, a plurality of mounting plates 36, 37, 62, and a plurality of annular plates 65.

[0061] The mounting plates 62 are flat plate-like portions arranged apart in the upward direction U of the mounting plate 37, and are provided in a pair on the left and right. The mounting plates 62 are formed to have the same shape and dimensions as the mounting plate 37 that faces them in the up-down direction UD. That is, the mounting plates 62 have mounting holes formed therethrough at positions corresponding to the mounting holes 37a of the mounting plate 37 (see FIG. 4), into which the bolts 39 are inserted.

[0062] The left and right inner edges of the mounting plate 62 are welded to the side wall plate 34 over substantially the entire length in the front-to-rear direction FB, forming weld beads 63. This welding causes the mounting plate 62 to protrude vertically in the left-to-right direction LR from the side wall plate 34. The mounting plates 36, 37 and the mounting plate 62 are arranged parallel to each other.

[0063] The annular plate 65 has the same configuration as the annular plate 38a of the first embodiment, and is not connected to the connecting portion 38c. That is, the annular plate 65 is an annular member having a mounting hole 38b (see FIG. 4) formed in the center, into which the bolt 39 is inserted.

[0064] A spacer made of a plurality of (four in this embodiment) annular plates 65 stacked in the up-down direction UD is sandwiched between the mounting plates 36, 37. Furthermore, a spacer made of a plurality of (three in this embodiment) annular plates 65 stacked in the up-down direction UD is sandwiched between the mounting plates 37, 62. This makes it possible to increase the rigidity of the portion of the second bracket 61 that is fastened by the bolts 39, as in the first embodiment, and improve the durability of the second bracket 61.

[0065] Furthermore, when input in the left-right direction LR is applied from the first bracket 11 to the second bracket 61, the number of portions that are braced between the bolt 39 and the side wall plate 34 can be reduced to three, that is, the mounting plates 36, 37, and 62. In this way, the greater the number of mounting plates 36, 37, and 62, the more the rigidity of the second bracket 61 against input in the left-right direction LR can be improved, and the more the durability of the second bracket 61 can be improved.

[0066] While the present invention has been described above based on the embodiments, it is not limited to the above embodiments, and it is readily apparent that various improvements and modifications are possible within the spirit and scope of the present invention. For example, the axis C of the first member 21 and the axis of the second member 22 may be offset from each other. Furthermore, the bolts 14, 17, and 39 may be replaced with other fastening members such as screws or rivets. Furthermore, the methods for joining the various parts of the second brackets 30, 51, and 61 may include mechanical joining methods such as pressure welding, brazing, adhesive bonding, and screw fastening, in addition to welding.

[0067] In the above embodiments, the vibration-damping devices 10, 50, 60 of the present invention are illustrated as engine mounts, but are not limited to this. For example, the present invention may be applied to motor mounts, member mounts, differential mounts, or vibration-damping devices mounted on devices other than vehicles. Furthermore, the present invention is not limited to the case where the first bracket 11 is attached to the vibration source side, such as an engine, and the second bracket 30, 51, 61 is attached to the vibration receiver side, such as the vehicle body. Alternatively, the first bracket 11 may be attached to the vibration receiver side and the second bracket 30, 51, 61 may be attached to the vibration source side.

[0068] In the above embodiment, the fixing portion 31 of the second bracket 30, 51, 61 is cylindrical, and the cylindrical second member 22 is press-fitted into the fixing portion 31. However, this is not limited to this. For example, the fixing portion 31 may be fitted into the second member 22 and then welded together; press-fitting is not essential. The fixing portion 31 and the second member 22 may also be formed into an elliptical cylindrical shape, a rectangular cylindrical shape, or another cylindrical shape. If the fixing portion 31 is elliptical cylindrical, the connection portion between the fixing portion 31 and the corner portion 35 can be narrowed toward the side wall plate 34, just as in the case of a cylindrical shape, thereby improving the rigidity of the vicinity of the connection portion.

[0069] Furthermore, the second member fixed to the second bracket 30, 51, 61 may be replaced with the first member 21 of the above embodiment, and the first member fixed to the first bracket 11 may be replaced with the second member 22 of the above embodiment. In this case, a hole provided in the center of the first plate 32 serves as a fixing portion, and the second member (first member 21 of the above embodiment) is fixed to the fixing portion with a bolt 17 or the like. In addition, the tip of the arm 15 may be made cylindrical, and the first member (second member 22 of the above embodiment) may be fitted onto the tip.

[0070] In the above embodiment, the mounting holes 36a, 37a, 38b into which the bolts 39 are inserted are provided in two locations on each of the left and right sides of the second bracket 30, 51, 61. However, this is not limited to this. For example, the mounting holes 36a, 37a, 38b may be provided in one location on each of the left and right sides, or in three or more locations, or the number of mounting holes may be different on each side. Furthermore, the multiple mounting holes 36a, 37a, 38b on each of the left and right sides may be offset in the left-right direction LR. Furthermore, the annular plate 38a and the mounting plate 37 may be overlapped on the mounting plate 36 at at least one location where the multiple bolts 39 are fastened, and the other fastening locations may be limited to only one mounting plate 36.

[0071] In the first embodiment, the weld bead 42 is formed on the connecting portion 38c, but this is not limited to this. The weld bead 42 may be formed on the annular plate 38a. Furthermore, the annular plates 38a overlapping in the up-down direction UD, the connecting portions 38c, and these and the mounting plates 36, 37 may be welded together by spot welding, projection welding, or the like. It is also possible not to weld these portions.

[0072] In the first and third embodiments, the spacer is formed by stacking the ring plates 38 and the annular plates 65 of the same shape, but this is not limiting. For example, the ring plates 38 and the annular plates 65 may be stacked. Also, part or all of the ring plates 38 and the annular plates 65 may be replaced with plates of the same shape as the mounting plates 37 and 62.

[0073] Furthermore, one or more of the ring plates 38, spacers 52, and annular plates 65 may be placed on the lower surface of the mounting plate 36 of the second brackets 30, 51, and 61. Similarly, one or more of the ring plates 38, spacers 52, and annular plates 65 may be placed on the upper surfaces of the mounting plates 37 and 62.

[0074] In the above embodiment, the mounting plate 36 is described as being integrally molded with the second plate 33, but this is not limiting. For example, the mounting plate 36 may be joined (by welding or screws, etc.) to the second plate 33, or the mounting plate 36 may be integrally molded with the side wall plate 34. Furthermore, the mounting plate 36 may be shifted in the upward direction U relative to the second plate 33.

[0075] Also, the side wall plate 34 may be extended downward in the direction D from the second plate 33, and the mounting plate 36 may be shifted downward in the direction D with respect to the second plate 33. In this case, the portion of the second bracket 30, 51, 61 that surrounds the arm 15 is raised from the vehicle body side, so that portion may be inverted upside down. Specifically, the first plate 32 may be connected to the lower edge side of the side wall plate 34, and the fixing portion 31 may be made to protrude downward in the direction D from the first plate 32. The same applies when a ring plate 38 or the like is placed on the lower surface of the mounting plate 36, raising the portion surrounding the arm 15.

[0076] Some of the configurations of the above embodiments may be omitted or combined. For example, the vertical reinforcing plate 53 in the second embodiment may be applied to the second brackets 30 and 61 in the first and third embodiments. In any of the embodiments, the vertical reinforcing plate 53 may be formed by bending the edges of the mounting plates 37 and 62 or the side wall plate 34.

[0077] In the second and third embodiments, as in the first embodiment, the spacer 52 or the annular plate 65 may be joined to the mounting plates 36, 37, and 62, or the annular plates 65 may be joined together. As in the first embodiment, the multiple spacers 52 of the second embodiment may be connected by connecting portions. Also, either the left or right mounting plates 36, 37, and 62 may be omitted. [Explanation of symbols]

[0078] 10,50,60 vibration isolation device 11 First Bracket 15 Arm 20 Anti-vibration device body 21 First member 22 Second member 23 Vibration-proof base 30,51,61 Second bracket 31 Fixed part 32 1st board 33 2nd board 34 Side wall panel 35 Corner 36, 37, 62 Mounting plate 36a, 37a, 38b Mounting holes 38 Link plate 38a,65 Annular plate 38c connection part 39 Bolts (fastening members) 52 spacer 53 Vertical reinforcement plate FB front-back direction (first direction) UD Vertical direction (second direction) LR Left / Right direction (3rd direction)

Claims

1. a vibration-isolating device main body in which a first member and a second member are connected by a vibration-isolating base made of an elastic material; a first bracket having an arm extending in a first direction to which the first member is fixed, the first bracket being attached to one of the vibration source side and the vibration receiving side; a second bracket fastened to the other of the vibration source side and the vibration receiving side by a fastening member, the second bracket includes a fixing portion to which the second member is fixed; a first plate on which the fixing portion is provided; a second plate facing the first plate with the arm interposed therebetween in a second direction perpendicular to the first direction; a pair of side wall plates that face each other across the arm in a third direction perpendicular to the first direction and the second direction and connect the first plate and the second plate; a plurality of mounting plates each extending from the side wall plate in the third direction and spaced apart from one another in the second direction; a spacer sandwiched between the plurality of mounting plates in the second direction, a mounting hole through which the fastening member is inserted and formed in the second direction at a portion where the mounting plate and the spacer overlap each other;

2. 2. The vibration isolation device according to claim 1, wherein at least one of the plurality of mounting plates spaced apart in the second direction is positioned so as to overlap the arm when viewed from the third direction.

3. The first plate and the side wall plate have edges connected to each other at curved corners, the fixing portion is formed in a cylindrical or elliptical cylindrical shape, protruding from the first plate and the corner portion toward an opposite side to the second plate and into which the second member fits; 2. The vibration isolation device according to claim 1, wherein the dimension of the connection portion between the fixing portion and the corner portion in the first direction decreases toward the side wall plate.

4. 2. The vibration isolation device according to claim 1, wherein the second bracket includes a vertical reinforcing plate that rises vertically from the side wall plate and the mounting plate.

5. 5. The vibration isolation device according to claim 1, wherein the spacer is formed by stacking a plurality of annular plates, each having the mounting hole at its center, in the second direction.

6. The mounting plate is provided with a plurality of mounting holes, The vibration-damping device according to claim 5, characterized in that the spacer is formed by stacking multiple connected ring plates in the second direction, each connected by a connecting portion, so that the ring plates are spaced apart in at least one of the first direction and the third direction to correspond to the multiple mounting holes.

7. 7. The vibration isolation device according to claim 6, wherein the connecting portions overlapping in the second direction are joined to each other and to the mounting plate.

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