Anti-vibration device

Abstract

To provide a vibration control device that can apply a common positioning member to a plurality of types of brackets having different thickness dimensions of peripheral edge parts of mounting holes and has a new structure.SOLUTION: A vibration control device 10 having a bracket 14 fixed to a vibration control connecting target member 32 includes: a positioning projection part 36 for positioning the bracket 14 by inserting a positioning member 34 mounted to a mounting hole 28 of the bracket 14 into a positioning hole 48 of the vibration control connecting target member 32; and a cylindrical mounting part 38 projecting from the positioning projection part 36 and inserted through the mounting hole 28. A lock claw 44 projecting to the outer periphery is provided in the mounting part 38. A peripheral edge part 47 of the mounting hole 28 is nipped between the positioning projection part 36 and the lock claw 44 so as to position the positioning member 34 relative to the bracket 14. A projection 50 projecting in the penetrating direction of the mounting hole 28 to adjust the thickness dimension of the peripheral edge part 47 is provided in the peripheral edge part 47 of the mounting hole 28.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an anti-vibration device used in a power unit mount of an automobile, etc. [Background technology]

[0002] Conventionally, vibration-damping devices used in automotive power unit mounts, etc., have been known. For example, a vibration-damping device is disclosed in JP 2015-218754 A (Patent Document 1), which has a structure in which a first mounting plate member and a second mounting plate member, which are brackets, are elastically connected by a main rubber elastic body.

[0003] The vibration isolation device of Patent Document 1 is provided with a cap as a guide that determines the relative position of the bracket with respect to the vehicle body. The cap in Patent Document 1 is attached to cover the nut, and is inserted into a positioning hole provided in the vehicle body to position the bracket and the vehicle body relative to each other. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-218754 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when a nut such as that in Patent Document 1 is not used, a structure may be adopted in which, for example, a mounting portion of a positioning member corresponding to the cap in Patent Document 1 is attached to a mounting hole that penetrates a bracket. That is, the mounting portion is tubular as a whole so that it can be inserted into the mounting hole, extends from a positioning protrusion that is inserted into a positioning hole in the vehicle body, and has a locking claw that protrudes outward from the tip of the protrusion. Then, the mounting portion is inserted into the mounting hole of the bracket, and the peripheral edge of the mounting hole is clamped between the opposing surfaces of the positioning protrusion and the locking claw of the positioning member, thereby attaching the positioning member to the bracket.

[0006] However, in such a mounting structure for a positioning member, the distance between the opposing surfaces of the positioning protrusion and the locking claw must be set with precision relative to the thickness dimension of the peripheral edge of the mounting hole in the bracket, and it was necessary to prepare dedicated positioning members for multiple types of brackets with different thickness dimensions of the peripheral edge of the mounting hole.

[0007] The problem to be solved by the present invention is to provide a vibration-damping device of a novel structure that allows a common positioning member to be attached to multiple types of brackets having different thickness dimensions around the mounting hole. [Means for solving the problem]

[0008] The following describes preferred embodiments for understanding the present invention, but the embodiments described below are merely examples and may be appropriately combined with one another. Multiple components described in each embodiment may be recognized and employed independently to the greatest extent possible, and may also be appropriately combined with any of the components described in other embodiments. Accordingly, the present invention is not limited to the embodiments described below, and various other embodiments may be realized.

[0009] The first aspect is a vibration-damping device comprising a bracket to be fixed to a vibration-damping connection target member, wherein a positioning member is attached to a mounting hole formed through the bracket, and the positioning member comprises a positioning protrusion that is inserted into a positioning hole in the vibration-damping connection target member to position the bracket relative to the vibration-damping connection target member, and a tubular mounting portion that extends from the positioning protrusion and is inserted into the mounting hole in the bracket, the protruding tip of the mounting portion is provided with a locking claw that protrudes outward, and the peripheral portion of the mounting hole is clamped between the opposing surfaces of the positioning protrusion and the locking claw, thereby positioning the positioning member relative to the bracket in the direction of penetration of the mounting hole, and the peripheral portion of the mounting hole in the bracket is provided with a protrusion that protrudes in the direction of penetration of the mounting hole to adjust and set the thickness dimension of the peripheral portion of the mounting hole.

[0010] With an anti-vibration device constructed according to this aspect, the thickness of the periphery of the mounting hole in the bracket can be easily adjusted by changing the protrusion length of the protrusion. Therefore, a common positioning member can be attached to multiple types of brackets that have different thicknesses in the area where there are no protrusions. Because the thickness of the periphery of the mounting hole is adjusted by the protrusion length of the protrusion, a common positioning member can be attached without changing the overall thickness of the bracket, minimizing the impact on the strength, weight, etc. of the bracket.

[0011] In a second aspect, in the vibration-damping device according to the first aspect, a fixing portion that is fixed to the vibration-damping connection target member is provided on the bracket.

[0012] When a fixing portion that is fixed to the vibration-damping connection target component is provided on the bracket as in this embodiment, the component dimensions (especially the thickness dimension) are set based on required characteristics such as load-bearing performance, so it is not realistic to change the thickness to attach a positioning component.However, by providing a protrusion, it is possible to attach a common positioning component while still meeting the required performance of the bracket.

[0013] In a third aspect, in the vibration-damping device according to the first or second aspect, the plurality of protrusions are provided spaced apart from one another in the circumferential direction.

[0014] With an anti-vibration device constructed in accordance with this embodiment, even if the protrusions have a hollow structure, by limiting the circumferential length of each protrusion, it is easy to ensure the deformation rigidity of the protrusions and prevent unintended deformation due to the attachment of a positioning member.

[0015] Preferably, three or more protrusions are provided spaced apart from one another in the circumferential direction, which allows stable attachment of the positioning member even if there is some error in the protruding dimensions of each protrusion.

[0016] In a fourth aspect, in the vibration-damping device described in any one of the first to third aspects, the opposing surfaces of the positioning protrusion and the locking claw in the positioning member are planes that extend perpendicular to the penetration direction of the mounting hole, and the tip surface of the protrusion is a plane that extends perpendicular to the penetration direction of the mounting hole.

[0017] With an anti-vibration device constructed in accordance with this embodiment, the surfaces of the positioning member and bracket that abut each other in the direction of the mounting hole are both planes that extend perpendicular to the direction of the mounting hole, thereby stabilizing the mounting state of the positioning member to the bracket.

[0018] In a fifth aspect, in the vibration-damping device according to any one of the first to fourth aspects, the mounting portion of the positioning member is divided into a plurality of portions in the circumferential direction.

[0019] With an anti-vibration device constructed in accordance with this embodiment, when the locking claw of the positioning member is inserted into the mounting hole of the bracket, the divided mounting portion deforms so as to contract toward the inner periphery, making it easier for the locking claw to pass through the mounting hole and facilitating the installation of the positioning member to the bracket.

[0020] In a sixth aspect, in the vibration-damping device according to any one of the first to fifth aspects, the bracket is a pressed metal piece, and the protrusion is press-molded.

[0021] With the vibration-damping device constructed according to this aspect, a bracket with a protrusion can be easily obtained by press working. In particular, the protrusion can be formed during the press molding of the bracket, eliminating the need for a separate step for forming the protrusion, and avoiding an increase in the number of manufacturing steps required for forming the protrusion. [Effects of the Invention]

[0022] According to the present invention, in a vibration isolation device, it is possible to employ a common positioning member for a plurality of types of brackets having different thickness dimensions of the peripheral edge portion of the mounting hole. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view showing an engine mount according to a first embodiment of the present invention; [Figure 2] FIG. 2 is a longitudinal cross-sectional view of the engine mount shown in FIG. 1, which corresponds to the cross-section II-II of FIG. 3. [Figure 3] III-III cross section of Figure 2 [Figure 4] A front view of an outer bracket that constitutes the engine mount shown in Figure 1. [Figure 5] Bottom view of the outer bracket shown in Figure 4 [Figure 6] FIG. 2 is a perspective view of a cap that constitutes the engine mount shown in FIG. 1. [Figure 7] FIG. 7 is a perspective view showing the cap shown in FIG. 6 from a different angle. [Figure 8] FIG. 2 is an enlarged longitudinal cross-sectional view showing the mounting structure of the cap in the engine mount shown in FIG. 1. [Figure 9] FIG. 1 is a longitudinal sectional view showing an engine mount according to a second embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0025] 1 to 3 show an engine mount 10 for an automobile as a first embodiment of a vibration-damping device constructed in accordance with the present invention. Engine mount 10 is a cylindrical vibration-damping device with a bracket, having an outer bracket 14 attached to a mount main body 12. Mount main body 12 has a structure in which an inner shaft member 16 and an outer cylindrical member 18 are connected by a main rubber elastic body 20. In the following description, as a general rule, the up-down direction refers to the up-down direction in FIG. 2, the front-rear direction refers to the left-right direction in FIG. 2, and the left-right direction refers to the left-right direction in FIG. 3.

[0026] The inner shaft member 16 has a generally cylindrical shape with a small diameter that extends linearly in the front-to-rear direction. The inner shaft member 16 is a highly rigid member formed from metal, fiber-reinforced synthetic resin, or the like. The specific shape of the inner shaft member is not particularly limited, and for example, it may be a cylindrical member without a center hole and provided with an attachment structure for a power unit or the like at its axial end, or it may have a cross-sectional shape other than a circle, such as a polygon.

[0027] The outer cylindrical member 18 has a generally cylindrical shape with a larger diameter than the inner shaft member 16. The outer cylindrical member 18 is a highly rigid member made of metal, fiber-reinforced synthetic resin, or the like.

[0028] The inner shaft member 16 and the outer cylindrical member 18 are arranged on the same central axis. The inner shaft member 16 and the outer cylindrical member 18 are arranged facing each other at a distance in the radial direction, and a main rubber elastic body 20 is arranged radially between the inner shaft member 16 and the outer cylindrical member 18. The main rubber elastic body 20 is approximately cylindrical, and its inner circumferential surface is vulcanization bonded to the outer circumferential surface of the inner shaft member 16, and its outer circumferential surface is vulcanization bonded to the inner circumferential surface of the outer cylindrical member 18. As a result, the inner shaft member 16 and the outer cylindrical member 18 are elastically connected in the radial direction by the main rubber elastic body 20, thereby forming the mount main body 12. The main rubber elastic body 20 is formed as an integrally vulcanization-molded product including the inner shaft member 16 and the outer cylindrical member 18. The inner shaft member 16 and the outer cylindrical member 18 protrude on both sides in the front-to-rear direction from the main rubber elastic body 20.

[0029] 1 to 3, an outer bracket 14 is attached to the outer cylindrical member 18 of the mount main body 12. As also shown in FIGS. 4 and 5, the outer bracket 14 has a structure in which an attachment cylindrical portion 22 and a fixing portion 24 are interconnected by a connecting portion 26.

[0030] The mounting tubular portion 22 has a generally cylindrical shape with a larger diameter than the outer tubular member 18. The outer tubular member 18 is press-fitted and fixed into the mounting tubular portion 22, thereby attaching the outer bracket 14 to the mount body 12.

[0031] The fixing portion 24 has a generally rectangular plate shape and is formed with a mounting hole 28 having a generally circular cross section that penetrates the central portion in the thickness direction. The fixing portion 24 is formed with bolt holes 30 on both the front and rear sides of the mounting hole 28. The bolt holes 30 are circular holes with a smaller diameter than the mounting hole 28, and two bolt holes 30 are provided on both the front and rear sides of the mounting hole 28, spaced apart in the left-right direction. The fixing portion 24 is fixed to a vehicle body 32, which is a target member for vibration-damping connection, by bolts (not shown) inserted into the bolt holes 30, thereby attaching the outer bracket 14 to the vehicle body 32, as shown in FIGS. 2 and 3 . The fixing portion 24 is, for example, a pressed metal fitting formed by pressing a metal plate.

[0032] The mounting tubular portion 22 and the fixed portion 24 are connected to each other by a connecting portion 26 shown in FIGS. 1 to 4. The connecting portion 26 is plate-shaped and extends substantially perpendicular to the front-rear direction, with its upper end surface having a concave curved surface that conforms to the outer circumferential surface of the mounting tubular portion 22. The connecting portion 26 connects the mounting tubular portion 22 and the fixed portion 24 by having its upper end fixed to the outer circumferential surface of the mounting tubular portion 22 and its lower end fixed to the upper surface of the fixed portion 24. In this embodiment, a pair of connecting portions 26, 26 are arranged facing each other and spaced apart in the front-rear direction, and these connecting portions 26, 26 are fixed to the mounting tubular portion 22 and the fixed portion 24 at two locations in the front-rear direction. This more firmly secures the mounting tubular portion 22 and the fixed portion 24, preventing relative displacement between the mounting tubular portion 22 and the fixed portion 24. Two sets of front and rear bolt holes 30, 30 provided in the fixed portion 24 are located on both the front and rear outer sides of the connecting portions 26, 26, as shown in FIG. 1. The attachment hole 28 is disposed between the pair of front and rear connecting portions 26, 26. The mounting tube portion 22 and the fixing portion 24 are fixed to the connecting portions 26, 26 by, for example, welding.

[0033] A cap 34 serving as a positioning member is attached to the fixing portion 24 of the outer bracket 14. As shown in Figures 6 and 7, the cap 34 includes a cylindrical positioning protrusion 36 and an attachment portion 38 that protrudes upward from the positioning protrusion 36. The cap 34 in this embodiment is made of synthetic resin, but may also be made of, for example, metal.

[0034] The positioning protrusion 36 has an upper portion formed in a cylindrical shape that extends in the vertical direction with a substantially constant outer diameter, and a lower portion formed in a tapered guide portion 40 that decreases in diameter downward. The upper surface of the positioning protrusion 36 is a flat surface that extends substantially perpendicular to the vertical direction.

[0035] The mounting portion 38 protrudes upward from the periphery of the upper opening of the center hole of the positioning protrusion 36 and has a generally cylindrical shape as a whole. In this embodiment, the mounting portion 38 is formed integrally with the positioning protrusion 36. The mounting portion 38 is divided into eight parts in the circumferential direction and is composed of eight locking pieces 42 that are arranged at intervals in the circumferential direction.

[0036] The locking piece 42 is plate-shaped with its thickness direction being the radial direction, allowing elastic bending deformation in the radial direction. A locking claw 44 that protrudes toward the outer periphery is provided at the protruding tip of the locking piece 42. The lower surface of the locking claw 44 is a flat surface that extends approximately perpendicular to the up-down direction, and the upper surface is an inclined surface 46 that slopes upward toward the inner periphery.

[0037] The outer diameter of the upper end of the mounting portion 38, which is made up of eight locking pieces 42, is smaller than the opening diameter of the mounting hole 28. The outer diameter of the mounting portion 38 at the lower end of the locking claws 44 is larger than the opening diameter of the mounting hole 28. The outer diameter of the mounting portion 38 below the locking claws 44 is approximately the same as the opening diameter of the mounting hole 28.

[0038] The cap 34 thus constructed is attached to the outer bracket 14. That is, the attachment portion 38 of the cap 34 is inserted into the attachment hole 28 of the fixed portion 24 that constitutes the outer bracket 14, and the peripheral portion (peripheral plate portion) 47 of the attachment hole 28 is sandwiched in the vertical direction between the positioning protrusion 36 of the cap 34 and the locking claw 44, thereby positioning the cap 34 in the vertical direction relative to the fixed portion 24.

[0039] When the mounting portion 38 of the cap 34 is inserted into the mounting hole 28 of the fixed portion 24, the inclined surface 46 at the insertion tip side is pressed against the peripheral edge 47 of the mounting hole 28, causing an inward force to act on the locking pieces 42 that make up the mounting portion 38. This causes each locking piece 42 to elastically bend and deform inward, and the mounting portion 38 is inserted into the mounting hole 28 in a reduced diameter state. When the locking claws 44 pass through the mounting hole 28 and are no longer in contact with the peripheral edge 47 of the mounting hole 28, the force acting on the locking pieces 42 is released, and the locking pieces 42 elastically return to their original shape. This causes the locking claws 44 to move above the peripheral edge 47 of the mounting hole 28, and the locking claws 44 are locked onto the peripheral edge 47 of the mounting hole 28, preventing the mounting portion 38 from slipping downward from the mounting hole 28. In this way, by dividing the mounting portion 38 into multiple locking pieces 42 in the circumferential direction, even if a locking claw 44 that protrudes outward is provided at the tip portion (upper end portion) of the mounting portion 38, the locking claw 44 can pass through the mounting hole 28, and the mounting portion 38 can be inserted into the mounting hole 28.

[0040] Cap 34 attached to fixing portion 24 constitutes a positioning mechanism that positions engine mount 10 and vehicle body 32 in the front-to-rear and left-to-right directions by inserting positioning protrusion 36 protruding downward from fixing portion 24 into positioning hole 48 provided in vehicle body 32. Note that, although positioning hole 48 in this embodiment is a through hole as shown in Figures 2 and 3, positioning hole 48 may also be a recessed portion with a bottom.

[0041] In this embodiment, the plate thickness dimension t of the fixing portion 24 is smaller than the distance d between the opposing surfaces of the positioning protrusion 36 and the locking claw 44 of the cap 34 in the vertical direction (see FIG. 8). Therefore, a plurality of protrusions 50 are provided on the peripheral portion 47 of the mounting hole 28 of the fixing portion 24. The protrusions 50 in this embodiment are formed by pushing the fixing portion 24 downward from above at the peripheral portion 47 of the mounting hole 28, causing the protrusions 50 to protrude downward. Therefore, as shown in FIGS. 2 and 8, the protrusions 50 have a hollow structure with recesses 52 that open to the top surface.

[0042] The protrusions 50 are generally inverted truncated cone shapes, with the outer circumferential surface tapering downward to the tip of the protrusion. The protrusions 50 are discontinuous spots, with six of them spaced approximately evenly apart in the circumferential direction. The lower surface, which is the tip surface of the protrusions 50, is a flat surface extending approximately perpendicular to the up-down direction. The upper surface of the fixing portion 24, outside the recess 52, is a flat surface extending approximately parallel to the lower surface of the protrusions 50.

[0043] In this embodiment, the fixing portion 24 is a press fitting, and the protrusion 50 is formed during the press process that forms the fixing portion 24. This eliminates the need for a special process for forming the protrusion 50, and makes it possible to easily obtain the fixing portion 24 with the protrusion 50 while preventing an increase in the number of manufacturing processes.

[0044] When the cap 34 is attached to the fixed portion 24, the upper surface of the positioning protrusion 36 of the cap 34 abuts against the tip surface (lower surface) of the protrusion 50 of the fixed portion 24, and the lower surface of the locking claw 44 of the cap 34 abuts against the upper surface of the peripheral portion 47 of the mounting hole 28 in the fixed portion 24. Here, as shown in Fig. 8, the height h of the protrusion 50 is set so that the sum (t + h) of the thickness t of the fixed portion 24 and the height h of the protrusion 50 is approximately the same as the distance d between the opposing surfaces of the upper surface of the positioning protrusion 36 and the lower surface of the locking claw 44. In short, the vertical thickness of the peripheral portion 47 of the fixed portion 24 is adjusted and set by the protrusion 50. As a result, even if the plate thickness dimension t of the fixed portion 24 is smaller than the distance d between the opposing surfaces of the upper surface of the positioning protrusion 36 and the lower surface of the locking claw 44, the fixed portion 24 can be sandwiched in the vertical direction between the positioning protrusion 36 and the locking claw 44, and the cap 34 can be fixed to the fixed portion 24.

[0045] The cap 34 can be attached to the fixed portion 24 by adjusting and setting the height h of the projection 50 without changing either the thickness t of the fixed portion 24 or the distance d between the opposing surfaces of the upper surface of the positioning protrusion 36 and the lower surface of the locking claw 44. Therefore, caps 34 with a predetermined distance d set can be attached to multiple types of fixed portions 24 having different thicknesses t, and a common cap 34 can be used for multiple types of outer brackets 14 having different thicknesses t of the fixed portions 24. Furthermore, there is no need to consider the attachment of the cap 34 when setting the thickness t of the fixed portion 24, and it becomes easy to set the thickness t of the fixed portion 24, which is the attachment portion to the vehicle body 32, to suit the required performance such as strength and the attachment structure to the vehicle body 32.

[0046] The tip surface of the protrusion 50 is located away from the mounting hole 28 on the outer periphery, but the upper surface of the positioning protrusion 36 extends further outward than the lower surface of the locking claw 44, so the upper surface of the positioning protrusion 36 can be abutted against the tip surface of the protrusion 50.

[0047] Because the protrusions 50 are provided at multiple locations in the circumferential direction, the abutment reaction forces of the protrusions 50 act in a balanced manner on the cap 34 in the circumferential direction, making it difficult for the positioning protrusion 36 to tilt. In particular, because the multiple protrusions 50 are provided independently and each abuts against the positioning protrusion 36 at a location spaced apart in the circumferential direction, variations in the abutment state due to errors in the height of the protrusions 50 or unevenness on the upper surface of the positioning protrusion 36 are unlikely to become a problem.

[0048] The tip surface of the projection 50 on the fixed portion 24 and the upper surface of the portion of the peripheral portion 47 of the mounting hole 28 that is not in the recess 52 are both flat surfaces that extend substantially perpendicular to the up-down direction. Furthermore, the upper surface of the positioning protrusion 36 on the cap 34 and the lower surface of the locking claw 44 are both flat surfaces that extend substantially perpendicular to the up-down direction. Therefore, the tip surface of the projection 50 and the upper surface of the positioning protrusion 36, as well as the upper surface of the peripheral portion 47 of the mounting hole 28 and the lower surface of the locking claw 44, are in stable contact with each other, thereby stably attaching the cap 34 to the fixed portion 24. Furthermore, when an external force acts on the cap 34 in a direction to remove it from the fixed portion 24, the engagement between the upper surface of the peripheral portion 47 of the mounting hole 28 and the lower surface of the locking claw 44 is effectively exerted to prevent it from coming off.

[0049] 9 shows an engine mount 60 according to a second embodiment of the present invention. The engine mount 60 has a structure in which a cap 34 is attached to a fixing portion 64 of an outer bracket 62. In the following description, members and parts that are substantially the same as those in the first embodiment are given the same reference numerals in the drawings, and description thereof will be omitted.

[0050] The fixing portion 64 has a protrusion 66 on the periphery 47 of the mounting hole 28. The protrusion 66 protrudes upward from the periphery 47 of the mounting hole 28. The protrusion 66 is generally frustoconical in shape and has a tapered shape that narrows in diameter toward the protruding tip. The protrusion 66 has a hollow structure due to a recess 68 that opens to the underside of the fixing portion 64. The protrusion 66 of this embodiment is formed, for example, by press working when the fixing portion 64 is press-molded, similar to the protrusion 50 of the first embodiment.

[0051] The mounting portion 38 of the cap 34 is inserted into the mounting hole 28 of the fixed portion 64, and the peripheral portion 47 of the mounting hole 28 in the fixed portion 64 is sandwiched between the upper surface of the positioning protrusion 36 in the cap 34 and the lower surface of the locking claw 44, thereby attaching the cap 34 to the fixed portion 64.

[0052] The thickness dimension t of the fixing portion 64 is smaller than the distance d between the opposing surfaces of the upper surface of the positioning protrusion 36 and the lower surface of the locking claw 44, and the sum of the thickness dimension t of the fixing portion 64 and the height dimension h of the protrusion 66 is approximately the same as the distance d between the opposing surfaces of the upper surface of the positioning protrusion 36 and the lower surface of the locking claw 44. The upper surface of the positioning protrusion 36 is overlapped and abuts against the lower surface of the fixing portion 64, and the lower surface of the locking claw 44 is overlapped and abuts against the tip surface (upper surface) of the protrusion 66, so that the fixing portion 64 is sandwiched between the positioning protrusion 36 and the locking claw 44 of the cap 34. As a result, the cap 34 is stably attached to the fixing portion 64, which is thinner than the distance d between the opposing surfaces of the upper surface of the positioning protrusion 36 and the lower surface of the locking claw 44.

[0053] Because the tip surface of the projection 66 is located at a position away from the mounting hole 28 toward the outer periphery, the protruding dimension of the locking claws 44 is made large enough to allow them to overlap the tip surface of the projection 66. Preferably, the distance between adjacent locking claws 44, 44 in the circumferential direction is made smaller than the circumferential width dimension of the tip surface of the projection 66, thereby realizing overlapping of the locking claws 44 and the projection 66 in an abutting state regardless of the circumferential orientation of the cap 34.

[0054] As can be understood from the above description of the embodiment, the present invention can also be understood as a bracket set of multiple types of brackets, each having a flat peripheral plate portion with a different thickness t around the mounting hole. At least the bracket with the thickest peripheral plate portion has a protrusion located on the peripheral plate portion that protrudes in the thickness direction, so that the effective thickness dimension t+h of each peripheral plate portion of the multiple types of brackets, i.e., the thickness dimension of the peripheral plate portion including the protrusion height if any, is uniform. In a bracket set consisting of such a combination of multiple types of brackets, identical caps 34 can be attached to each mounting hole 28. The distance d between the opposing surfaces of the caps 34 attached to at least each mounting hole 28 can be uniform, and the shape and size of the mounting portion 38 can be uniform. This simplifies design and manufacturing even when the shape and size of the positioning protrusion 36 are different. The multiple types of brackets may differ not only in thickness but also in overall shape and size.

[0055] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific description. For example, the protrusions are not limited to the spot-like shapes shown in the above embodiments, but may have a shape extending in the circumferential direction, for example. In this case, the protrusions may be continuous annular shapes around the entire periphery 47 of the mounting hole 28, or multiple protrusions extending less than one circumference may be provided.

[0056] The protrusion is preferably formed by pressing the fixing portion 24, but may also be formed integrally with the fixing portion 24 by, for example, cutting or etching, or may be formed by fixing a separate part to the fixing portion 24.

[0057] The mounting portion 38 of the cap 34 does not necessarily have to be divided into multiple parts. For example, the mounting portion 38 can be cylindrical if it is given a certain degree of flexibility so that it can be inserted into the mounting hole 28 by deformation of the mounting portion 38.

[0058] In the cap 34, the positioning protrusion 36 and the mounting portion 38 do not necessarily have to be formed integrally. For example, the cap as a positioning member may have the mounting portion 38 formed from a synthetic resin and the positioning protrusion 36 formed from a metal. Also, the cap may be formed by two-color molding, for example, with the positioning protrusion 36 and the mounting portion 38 made from different synthetic resin materials.

[0059] In the above embodiment, a structural example was shown in which the cap 34 is attached so as to protrude downward from the fixing portion 24 of the outer bracket 14, but the cap 34 may be provided so as to protrude sideways or upward from the fixing portion 24.

[0060] In the above embodiment, an example was shown in which the present invention was applied to a cylindrical vibration-damping device, but the present invention can also be applied to vibration-damping devices other than cylindrical ones, such as the engine mount shown in Patent Document 1 (JP 2015-218754 A). In Patent Document 1, a cap is attached by covering the nut, but the cap can be attached by inserting the attachment portion of the cap into the attachment hole using the structure of the present invention.

[0061] The structure of the outer bracket 14 is not particularly limited, and for example, the specific structure of the fixing portion 24 can be changed as appropriate depending on the required mounting structure to the vehicle body 32. For example, instead of or in addition to the bolt hole 30 in the fixing portion 24, a stud bolt may be provided in the fixing portion 24. [Explanation of symbols]

[0062] 10 Engine mount (first embodiment, vibration isolation device) 12 Mount body 14 Outer bracket (bracket) 16 Inner shaft member 18 outer cylindrical member 20 Main body rubber elastic body 22 Mounting tube 24 Fixed part 26 Connecting part 28 Mounting holes 30 bolt holes 32 Vehicle body 34 Cap (positioning member) 36 Positioning protrusion 38 Mounting part 40 Information Department 42 Locking piece 44 Locking claw 46 Slope 47 Periphery 48 Positioning holes 50 protrusions 52 recess 60 Engine mount (second embodiment vibration isolation device) 62 Outer bracket (bracket) 64 Fixed part 66 Protrusion 68 Recess

Claims

1. A vibration-damping device having a bracket fixed to a vibration-damping connection target member, a positioning member is attached to an attachment hole formed through the bracket; the positioning member includes a positioning protrusion that is inserted into a positioning hole of the vibration-damping connection target member to position the bracket relative to the vibration-damping connection target member, and a tubular mounting portion that extends from the positioning protrusion and is inserted into the mounting hole of the bracket, The protruding tip of the attachment portion is provided with a locking claw that protrudes outward, The peripheral edge of the mounting hole is sandwiched between the opposing surfaces of the positioning protrusion and the locking claw, thereby positioning the positioning member relative to the bracket in the penetrating direction of the mounting hole, The vibration-damping device has a protrusion on the peripheral edge of the mounting hole in the bracket that protrudes in the direction of penetration of the mounting hole to adjust and set the thickness dimension of the peripheral edge of the mounting hole.

2. The vibration-damping device according to claim 1 , wherein the bracket is provided with a fixing portion that is fixed to the vibration-damping connection target member.

3. 3. The vibration-damping device according to claim 1, wherein a plurality of the protrusions are provided spaced apart from one another in the circumferential direction.

4. The opposing surface of the positioning member between the positioning protrusion and the locking claw is a plane that extends perpendicular to the penetration direction of the mounting hole, 3. The vibration-damping device according to claim 1, wherein the tip end surface of the projection is a flat surface that extends perpendicular to the direction in which the mounting hole penetrates.

5. 3. The vibration-damping device according to claim 1, wherein the mounting portion of the positioning member is divided into a plurality of portions in the circumferential direction.

6. 3. The vibration-damping device according to claim 1, wherein the bracket is a pressed metal piece, and the protrusion is press-formed.

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