JP5232690B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator that elastically connects a vibrating body and a support, and particularly to a vibration isolator including a mass body for suppressing resonance amplitude.

  2. Description of the Related Art Conventionally, an engine having an inner cylinder and an outer cylinder, and a rubber elastic body that is provided between the inner cylinder and the outer cylinder and connects the two, for example, an engine, a transmission (power plant), and a vehicle body are elastically connected. Anti-vibration devices used as mounts, torque rods, and the like are known. This type of vibration isolator, while fixing the inner cylinder to one of the vehicle body side and the power plant side and fixing the outer cylinder to the other, absorbs or attenuates vibration from the power plant, Used to suppress transmission to the car body.

It is also known to attach a mass member (mass body) to this type of vibration isolator to suppress the resonance amplitude of the vibration isolator. For example, Patent Document 1 includes a first bush that includes a first inner cylinder, a first outer cylinder, and a first vibration isolation base (rubber elastic material) interposed therebetween, and is attached to the engine side. A second bushing attached to the vehicle body and the first and second bushes are connected to each other, comprising a second inner cylinder, a second outer cylinder, and a second vibration isolation base (rubber elastic material) interposed therebetween. In a torque rod provided with a connecting member to be connected, a mass member is press-fitted and fixed in a through hole formed by penetrating a flange portion extending outward from the outer peripheral surface of the second bush in the thickness direction. Has been.
JP 2008-95821 A

  By the way, in the thing of the above-mentioned patent document 1, since the man-hour increases from fixing the mass body to the through hole formed in the flange portion, and attaching the mass body to the flange portion instead of attaching to the outer cylinder, The mounting position of the mass body is far from the vibration source, and the effect of suppressing the resonance amplitude may be reduced.

  Therefore, it is conceivable to weld the mass body directly to the outer cylinder in order to make the mounting position of the mass body close to the vibration source while simplifying the structure, but it is thick on the outer peripheral surface of the outer cylinder with a thin wall thickness. When the mass body is attached by welding, the outer cylinder is deformed by the attracting force of the mass body, so that the rubber elastic body that requires severe dimensional accuracy is deformed and its spring characteristics are adversely affected. The type in which the vibration-proof base made of the cylinder and the rubber elastic body is press-fitted into the outer cylinder has a problem that the press-fitting becomes difficult.

  Here, “attracting force” refers to, for example, a force that acts to attract a thin plate to a thick plate when plates having different thicknesses and shapes are assembled. When welding plates with different shapes, the welded material has a shallow penetration on the thick plate side, and the welded material has a deeper penetration on the thin plate side with a small heat capacity. It refers to the force acting to weld.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a vibration isolator having an inner cylinder and an outer cylinder, and a rubber elastic body provided between the inner cylinder and the outer cylinder. An object of the present invention is to provide a technique capable of suppressing the resonance amplitude while suppressing distortion of the outer cylinder with a simple structure.

  In order to achieve the above object, in the present invention, the mass body welded to the outer peripheral surface of the outer cylinder is divided into a thin plate portion having a plate thickness equal to or less than the thickness of the outer peripheral wall of the outer cylinder, and a thick mass body. The main body is divided so that the strain is easily concentrated on the thin plate portion.

1st invention is a vibration isolator provided with the inner cylinder, the outer cylinder provided in the circumference | surroundings of the said inner cylinder, and the rubber elastic body which is provided between these inner cylinders and an outer cylinder, and connects both A mass body disposed on an outer peripheral surface of the outer cylinder, the mass body having a plate thickness equal to or less than a thickness of a peripheral wall of the outer cylinder, and being welded to the outer cylinder A plate portion that is joined, and a mass body body that is caulked and fixed by the plate portion, and a recess is formed in the mass body main body, and the plate portion includes the mass body. It has a caulking portion that is caulked so as to be wound, and a tip portion of the caulking portion is accommodated in the concave portion .

  In the first invention, the mass body disposed on the outer peripheral surface of the outer cylinder is divided into a thin plate portion having a thickness equal to or less than the thickness of the outer peripheral wall of the outer cylinder and a mass body main body having a sufficient thickness. Since the portion is joined to the outer peripheral surface of the outer cylinder by welding, the attractive force acting as if the thin member is welded to the thick member is likely to work to distort the plate portion, not the outer cylinder. . In this way, the distortion of the outer cylinder can be suppressed by easily concentrating the distortion on the plate portion, so that the adverse effect on the spring characteristics due to the deformation of the rubber elastic body can be suppressed, and the shape of the outer cylinder can be reduced. Therefore, even in the type in which the vibration isolating base composed of the inner cylinder and the rubber elastic body is press-fitted into the outer cylinder, the vibration isolating base can be easily press-fitted.

  Further, since the mass body is caulked and fixed by the plate portion, there is no need to perform bolt fastening or the like, and the structure becomes simple.

  Furthermore, since the thick plate mass body is attached to the outer cylinder via a plate portion welded directly to the outer peripheral surface of the outer cylinder, a mass body having a sufficient weight is disposed in a portion extremely close to the vibration source. Will be. Therefore, the effect of suppressing the resonance amplitude by the mass body can be exhibited with a simple structure.

Moreover, since the mass body main body is caulked so as to be caught by the caulking portion, it is difficult to move in the winding direction. In addition, since the leading end of the crimping portion is accommodated in a recess formed in the mass body main body, when the mass body main body attempts to move in the winding axial direction, both ends of the crimping portion in the winding axial direction at the leading end portion of the crimping portion are It abuts against the wall surface that defines the recess of the body body. Thus, since the mass body main body is difficult to move in the winding direction and the winding axis direction, it is more firmly fixed to the plate portion.

  The “rubber elastic body connecting both (inner cylinder and outer cylinder)” is not limited to those directly connected to the outer cylinder, but, for example, via a resin outer cylinder or a metal outer cylinder. The thing connected with an outer cylinder is also included.

  In a second aspect based on the first aspect, the plate portion extends substantially in the circumferential direction of the outer cylinder as viewed from the cylinder axis direction, and is welded to the outer circumferential surface of the outer cylinder at both ends thereof. In addition, the mass body main body is caulked at a portion other than the both end portions.

  In the second invention, distortion tends to concentrate at both ends of the plate portion. However, since the mass body is fixed by caulking at portions other than these both ends, the portion is affected by the distortion of the plate portion. Is unlikely to occur. Thereby, since the generation | occurrence | production of the clearance gap, loosening, etc. in the site | part which has crimped the mass body main body is suppressed, a mass body main body can be fixed firmly.

  In a third aspect based on the second aspect, the plate portion is attached to the outer peripheral surface of the outer cylinder with a portion other than the both end portions spaced apart from the outer peripheral surface of the outer cylinder. It is characterized by.

  In the third aspect of the invention, since the plate portion is disposed at a distance from the outer peripheral surface of the outer cylinder except for the welded portion (both end portions), both ends of the plate portion can be used even when the vibration isolator vibrates. Parts other than the portion and the outer cylinder are difficult to contact. Thereby, generation | occurrence | production of the chatter sound which arises when a plate part and an outer cylinder repeat contact and separation | spacing can be suppressed.

  According to the vibration isolator of the present invention, the mass body is divided into the mass body main body and a thin plate portion having a thickness equal to or less than the thickness of the outer peripheral wall of the outer cylinder, and the plate portion is joined to the outer peripheral surface of the outer cylinder by welding. Therefore, the distortion due to the attractive force is easily concentrated on the plate portion, and the distortion of the outer cylinder is suppressed. Further, since the mass body main body is fixed to the outer cylinder by caulking and fixing with the plate portion, the mass body having a sufficient weight is disposed in a portion extremely close to the vibration generation source. Therefore, the resonance amplitude of the vibration isolator can be suppressed with a simple structure while suppressing distortion of the outer cylinder.

Furthermore, the mass body main body is caulked so as to be caught by the caulking portion, and the leading end of the caulking portion is accommodated in the recess formed in the mass body main body, so that the mass body main body is in the winding direction and the winding axis direction. It becomes difficult to move and is more firmly fixed to the plate portion.

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

(Embodiment 1)
1 is a perspective view of a torque rod according to the present embodiment, FIG. 2 is a top view of the torque rod, FIG. 3 is a side view of the torque rod, and FIG. 4 is a transmission of the torque rod. It is a top view which shows the attachment state to a vehicle body. As shown in FIG. 4, the torque rod (anti-vibration device) 1 has its front end (end on the side where the outer cylinder 5 is provided) facing the rear side in the vehicle front-rear direction and its upper surface is the upper side in the vehicle vertical direction. Are attached to the transmission 40 (power plant side) and the vehicle body frame 6 (vehicle body side). Specifically, the outer cylinder 5 is provided on the basis of the torque rod 1 hereinafter. The side will be described as the front side in the front-rear direction, and the cylinder axis direction of the outer cylinder 5 will be described as the vertical direction.

  The torque rod 1 includes an inner cylinder 3 attached to the vehicle body frame 6, an outer cylinder 5 provided around the inner cylinder 3, and a rubber elasticity provided between the inner cylinder 3 and the outer cylinder 5 to connect the two. A body 7, a bracket 2 for connecting the outer cylinder 5 and the transmission 40 via a transmission bracket 8, and a weight (mass body) 9 disposed on the outer peripheral surface of the outer cylinder 5. Thus, transmission of vibration from the transmission 40 to the vehicle body is reduced.

  The outer cylinder 5 is integrally formed with the bracket 2 by processing a sheet metal, and has a substantially cylindrical shape having a straight wall portion 5a extending in the left-right direction at the front end portion when viewed from above. The bracket 2 has a bottom wall portion 2a and a side wall portion 2b, and the outer cylinder 5 extends upward so as to bulge from the bottom wall portion 2a.

  The bottom wall 2a of the bracket 2 has a substantially circular front bottom wall 2c having a linear portion extending in the left-right direction at the rear end in a top view, and is inclined downward toward the rear from the rear end of the front bottom wall 2c. The rear bottom wall 2d has a substantially trapezoidal shape when viewed from above.

  The side wall 2b of the bracket 2 extends upward from the peripheral edge of the front bottom wall 2c and the side edge of the rear bottom wall 2d. The side wall portion 2b is formed so as to be higher toward the rear, and the upper end portion of the side wall portion 2b is bent outward to increase the rigidity. The rear end portions 2e and 2f on both the left and right sides of the side wall portion 2b extend further rearward than the rear end of the rear bottom wall portion 2d and face the left and right directions. As shown in FIG. 4, the bracket 2 has a transmission bracket 8 sandwiched between the left and right rear end portions 2e and 2f, and a bolt (not shown) is attached to a nut 2g provided on the right rear end portion 2f. By screwing, it is fixed to the transmission 40 side.

  The inner cylinder 3 is formed in a columnar body having a substantially triangular shape when viewed from above, and a mounting hole 3a extending in the vertical direction is formed through the center thereof. The inner cylinder 3 is fixed to the vehicle body side by fastening a bolt 16 inserted through the mounting hole 3 a to the vehicle body frame 6. In addition, the code | symbols 3b and 3b in a figure show the lightening hole for aiming at weight reduction of the inner cylinder 3. FIG.

  The rubber elastic body 7 includes a pair of leg portions 7a and 7b formed so as to expand in a letter C shape when viewed from above, a stopper portion 7c, and a linear portion 7e extending in the left-right direction at the front end portion when viewed from above. And a connecting portion 7d that connects the pair of leg portions 7a and 7b and the stopper portion 7c. The pair of leg portions 7a and 7b extend from both ends of the linear portion 7e of the connecting portion 7d toward the axial center, and are each vulcanized and bonded to two surfaces of the substantially triangular prism-shaped inner cylinder 3. The stopper portion 7c is disposed so as to come into contact with the remaining one surface of the inner cylinder 3 when the inner cylinder 3 is displaced.

  A resin outer cylinder 4 is integrally injection-molded on the outer peripheral surface of the rubber elastic body 7 (connecting portion 7d). Thereby, the rubber elastic body 7 is pre-compressed in the direction orthogonal to the cylinder axis by the injection molding pressure of the resin, and the durability is improved. The vibration-insulating base composed of the inner cylinder 3, the rubber elastic body 7, and the resin outer cylinder 4 is aligned with the straight wall portion 5a of the outer cylinder 5 and the straight portion 7e of the connecting portion 7d. The inner cylinder 3 and the outer cylinder 5 are connected by the rubber elastic body 7 by being press-fitted and bonded to the inner peripheral surface of the outer cylinder 5 via an adhesive (not shown).

  The weight 9 has a plate portion 19 joined to the outer peripheral surface of the outer cylinder 5 by welding, and a weight main body portion (mass body main body) 29 fixed by caulking by the plate portion 19. The resonance amplitude of the torque rod 1 is suppressed.

  The plate portion 19 has a plate thickness t1 that is thinner than the thickness T1 of the peripheral wall of the outer cylinder 5, and extends in a substantially circumferential direction of the outer cylinder 5 in a top view (as viewed from the cylinder axis direction). The both ends 19d and 19d are welded to the outer peripheral surface of the outer cylinder 5. More specifically, the plate portion 19 is obtained by bending a substantially T-shaped plate made of sheet metal, and extends in the left-right direction so as to come into contact with the straight wall portion 5a of the outer cylinder 5 as a rectangular plate-shaped plate body portion 19a. And plate leg portions 19b, 19b respectively extending from the left and right ends of the plate main body portion 19a to the rear side in the front-rear direction, the center portion of the plate main body portion 19a, the bottom wall portion 19e, the side wall portion 19f, and the top wall It has a caulking portion 19c which is composed of a portion 19g and a tip portion 19h and is caulked so as to wind the weight main body portion 29, and the rear end portions (both ends of the plate portion 19) 19d of each plate leg portion 19b, 19b. , 19d are joined to the outer peripheral surface of the outer cylinder 5 by mag welding over the entire width in the vertical direction. The welding method is not limited to mag welding, and arc spot welding or the like may be employed.

  In this way, by welding the plate portion 19 thinner than the thickness T1 of the peripheral wall of the outer cylinder 5 to the outer peripheral surface of the outer cylinder 5, the welding of the welding material becomes shallow on the thick outer cylinder 5 side. In the thin plate portion 19 side, the welding material deepens. For this reason, an attractive force acts as if the plate portion 19 is welded to the outer cylinder 5, so that distortion is induced in the plate portion 19 and the outer cylinder 5 is less likely to be distorted.

  The weight main body 29 is made of cast iron, has a substantially rectangular parallelepiped shape extending in the left-right direction, and is formed with a recess 29a that is open on the upper surface thereof. The weight main body 29 is caulked and fixed by a caulking portion 19c at a portion other than both end portions 19d and 19d of the plate portion 19, more specifically, at a central portion in the left-right direction of the plate main body portion 19a. In other words, the caulking portion 19c has substantially the same width as the width of the concave portion 29a of the weight main body portion 29 in the left-right direction, and the bottom wall portion 19e extending forward from the plate main body portion 19a is formed on the lower surface of the weight main body portion 29. The side wall portion 19f extending upward from the front end of the bottom wall portion 19e is in contact with the front surface of the weight main body portion 29, and the top wall portion 19g extending rearward from the upper end of the side wall portion 19f is in contact with the upper surface of the weight main body portion 29. The weight main body 29 is caulked so as to be rolled up. A front end portion 19h of the caulking portion 19c extending downward from the rear end of the top wall portion 19g is accommodated in the concave portion 29a of the weight main body portion 29 and is in contact with a front wall surface that defines the concave portion 29a.

  Thus, since the weight main-body part 29 is crimped by the crimping | crimped part 19c, the movement to the winding direction (up-down direction and the front-back direction) is controlled. In addition, since the front end portion 19h of the caulking portion 19c having substantially the same width as the concave portion 29a is accommodated in the concave portion 29a, when the weight main body portion 29 is about to move in the left-right direction, the left and right ends of the front end portion 19h of the caulking portion 19c Both ends are in contact with the left and right wall surfaces 29b and 29c that define the recess 29a. In this way, the weight main body 29 is also restricted from moving in the winding axis direction (left-right direction).

  As described above, the thin plate portion 19 is distorted. However, the bent caulking portion 19c may increase the rigidity of the entire plate portion 19 and distort the outer cylinder 5 side. It is preferable that the weight main body 29 is caulked and fixed by bending the caulking portion 19c after welding the outer peripheral surface of the outer cylinder 5.

-Effect-
According to the present embodiment, the weight 9 disposed on the outer peripheral surface of the outer cylinder 5 includes a thin plate portion 19 having a thickness t1 thinner than the thickness T1 of the peripheral wall of the outer cylinder 5, and a sufficient thickness. Since the both ends 19d and 19d of the plate part 19 are joined to the outer peripheral surface of the outer cylinder 5 by welding, it acts as if the thin member is welded to the thick member. The attractive force acts to distort the plate portion 19 instead of the outer cylinder 5. In this way, by concentrating the strain on the plate portion 19, the distortion of the outer cylinder 5 can be suppressed, so that the adverse effect on the spring characteristics due to the deformation of the rubber elastic body 7 is suppressed, and the shape of the outer cylinder 5 is maintained. Therefore, it is possible to easily press-fit the vibration-proof base composed of the inner cylinder 3, the rubber elastic body 7, and the resin outer cylinder 4 into the outer cylinder 5.

  In addition, since the weight main body 29 is caulked and fixed by the plate part 19 that is directly welded to the outer peripheral surface of the outer cylinder 5 in this way, the weight main body 29 is attached to the outer cylinder 5 via the plate part 19. The weight 9 having a sufficient weight is disposed in a portion very close to the vibration generation source. Therefore, the effect of suppressing the resonance amplitude by the weight 9 can be exhibited with a simple structure.

  Further, although distortion tends to concentrate on both end portions 19d and 19d of the plate portion 19 welded to the outer peripheral surface of the outer cylinder 5, the weight main body portion 29 is a central portion in the left-right direction of the plate main body portion 19a, and the caulking portion 19c. Therefore, the caulking portion 19c is hardly affected by the distortion of the plate portion 19. Thereby, since the generation | occurrence | production of the clearance gap, loosening, etc. in the crimping | crimped part 19c is suppressed, the weight main-body part 29 can be fixed firmly.

  Further, since the weight main body 29 is crimped so as to be wound by the crimping portion 19c, it is difficult to move in the vertical direction and the front-rear direction. Further, since the tip 19h of the caulking portion 19c is accommodated in a recess 29a formed in the weight main body 29, when the weight main body 29 attempts to move in the left-right direction, the winding shaft at the tip 19h of the caulking portion 19c. Both ends in the direction abut against the wall surfaces 29 b and 29 c that define the recess 29 a of the weight main body 29. As described above, the weight main body portion 29 is difficult to move in the vertical direction, the front-rear direction, and the left-right direction, and thus is more firmly fixed to the plate portion 19.

(Embodiment 2)
Unlike the above embodiments, this embodiment uses a vibration isolator as the engine mount 11. Hereinafter, differences from the above embodiments will be described.

  FIG. 5 is a perspective view of the engine mount according to the present embodiment, and FIG. 6 is a view of the engine mount as viewed from the cylinder axis direction. In FIG. 6, the flange portion 15a of the outer cylinder 15 is indicated by a broken line in order to make the drawing easier to see.

  The engine mount 11 includes an anti-vibration base having an inner cylinder 13 and a rubber elastic body 17 attached to a transmission (not shown), an outer cylinder 15 provided around the anti-vibration base, two metal brackets 12a, 12 b and a weight (mass body) 9 disposed on the outer peripheral surface of the outer cylinder 15.

  The outer cylinder 15 has a substantially cylindrical shape, and is attached to a body frame (not shown) on the vibration receiving side by the metal brackets 12a and 12b integrally attached to the outer periphery so as to extend outward in the cylinder radial direction. It is connected.

  The inner cylinder 13 is formed in a substantially cylindrical shape, and is connected to a power plant (not shown) on the vibration source side by brackets (not shown) whose both ends in the cylinder axis direction are coupled by bolts or the like. It has come to be. Reference numeral 37 in the figure is externally fitted to one end of the inner cylinder 13 in the cylinder axial direction, and makes contact with a bracket or the like on the power plant side to thereby move the inner cylinder 13 and the outer cylinder 15 relative to each other. Indicates the stopper to be controlled.

  In addition to the inner cylinder 13 and the rubber elastic body 17, the vibration isolating base includes an outer cylinder 33 interposed between the rubber elastic body 17 and the outer cylinder 15, and the inner cylinder 13 inside the rubber elastic body 17. An intermediate cylinder 43 embedded in an intermediate portion of the outer cylinder 33, a main fluid chamber and a sub-fluid chamber (not shown) formed in the inner cylinder 13 inside the rubber elastic body 17, and both of these fluid chambers And an orifice passage (not shown) communicating with each other. Each fluid chamber is filled with liquid and gas. Then, the liquid in the main fluid chamber and the sub fluid chamber circulates through the orifice passage so that the low-frequency and large-amplitude vibration acting on the rubber elastic body 17 from the inner cylinder 13 is attenuated. Yes.

  The weight 9 includes a plate portion 39 joined to the outer peripheral surface of the outer cylinder 15 by welding at both end portions 39d and 39d, and a rectangular parallelepiped weight main body (mass body main body) fixed by caulking to the plate portion 39. 49) to suppress the resonance amplitude of the engine mount 11.

  The plate portion 39 has a thickness t2 that is smaller than the thickness T2 of the peripheral wall of the outer cylinder 15, extends in the substantially circumferential direction of the outer cylinder 15 when viewed from the cylinder axis direction, and both end portions 39d, 39d thereof. Other parts are welded to the outer peripheral surface of the outer cylinder 15 in a state of being spaced from the outer peripheral surface of the outer cylinder 15.

  More specifically, the plate portion 39 is formed by bending a substantially cross-shaped plate made of sheet metal, and the vertical bisector coincides with the radial direction when viewed from the cylinder axis direction and from the outer peripheral surface of the outer cylinder 15. A rectangular plate-shaped plate body 39a that is spaced apart, and plate legs 39b and 39b that extend from both ends of the plate body 39a toward the outer peripheral surface of the outer cylinder 15 so as to be orthogonal to the plate body 39a, The caulking portions 39c, 39c are provided on both sides in the cylinder axis direction at the center portion of the plate main body portion 39a, and are each composed of a side wall portion 39e, a top wall portion 39f, and a tip end portion 39g and caulking the weight main body portion 49 so as to be wound. And have. End portions 39d and 39d of the plate leg portions 39b and 39b are joined to the outer peripheral surface of the outer cylinder 15 by mag welding over the entire width in the cylinder axis direction. That is, in the plate portion 39, only the end portions 39d and 39d of the plate leg portions 39b and 39b are in contact with the outer peripheral surface of the outer cylinder 15, and even when the transmission vibrates, the plate main body portion 39a and the outer cylinder 15 does not come into contact.

  The weight main body portion 49 has a substantially rectangular parallelepiped shape, and is formed with a concave portion 49a that is open on the outer surface in the cylinder radial direction. More specifically, the weight main body portion 49 is formed at a portion other than both end portions 39d and 39d of the plate portion 39. Is caulked and fixed by caulking portions 39c and 39c at the central portion of the plate main body portion 39a. In other words, the caulking portions 39 c and 39 c have substantially the same width as the concave portion 49 a of the weight main body portion 49, and the side wall portions 39 e and 39 e extending outward from the plate main body portion 39 a in the cylinder radial direction are cylinders of the weight main body portion 49. On the surfaces on both sides in the axial direction, the top wall portions 39f and 39f extending from the ends on the outer side in the cylinder radial direction of the side wall portions 39e and 39e to the one side and the other side in the cylinder axial direction are the surfaces on the outer side in the cylinder radial direction of the weight main body 49. The weight main body portion 49 is caulked so as to be wound from both sides in the cylinder axis direction in a state of being in contact with each other. The front end portions 39g, 39g of the caulking portions 39c, 39c extending inward in the cylinder radial direction from the end portions of the top wall portions 39f, 39f are accommodated in the recess portions 49a of the weight main body portion 49, and the cylinder axis direction that defines the recess portions 49a It is in contact with the walls on both sides.

  Thus, since the weight main-body part 49 is crimped by the crimping part 39c, the movement to the winding direction (a cylinder axial direction and a cylinder radial direction) is controlled. Further, since the front end portions 39g and 39g of the caulking portions 39c and 39c having substantially the same width as the concave portion 49a are accommodated in the concave portion 49a, the weight main body portion 49 is in the winding axis direction perpendicular to the cylindrical axis direction and the cylindrical radial direction. When it is about to move, both ends of the crimping portions 39c, 39c in the winding axis direction at the tip portions 39g, 39g come into contact with the wall surfaces 49b, 49c that define the recess 49a. As described above, the weight main body 49 is also restricted from moving in the winding axis direction.

-Effect-
According to the present embodiment, the plate portion 39 is arranged such that the portions other than the welded portions 39d and 39d are spaced from the outer peripheral surface of the outer cylinder 15, so that the plate portion 39 and the outer cylinder 15 are brought into contact with and separated from each other. It is possible to suppress the occurrence of chatter noise caused by repeating the above.

  Further, since the weight main body portion 49 is caulked from both sides in the cylinder axis direction by the caulking portions 39c and 39c of the plate portion 39, it is more firmly fixed to the plate portion 39.

(Reference example)
The reference example is different from the above embodiments in that the weight 10 is welded not to the outer peripheral surface of the outer cylinder 15 but to the flange portion 15 a of the outer cylinder 15. Hereinafter, description of the same components as those of the second embodiment will be omitted.

  FIG. 7 is a view of the engine mount according to the reference example as seen from the cylinder radial direction. The engine mount 11 has a flange portion 15a formed by bending an end portion of the outer cylinder 15 on one side in the cylinder axial direction (front side in FIG. 8) 90 degrees outward in the cylinder radial direction.

  The weight 10 includes a plate portion 20 and a rectangular parallelepiped weight main body portion 30 attached to the plate portion 20. The plate portion 20 includes a rectangular plate-shaped plate main body portion 20a, a mounting portion 20b extending outward from the one end of the plate main body portion 20a in the cylinder axial direction, a side wall portion 20d, and a top wall portion 20e. And only the mounting portion 20b is welded to the flange portion 15a. Further, the caulking portion 20c is configured such that the side wall portion 20d extending outward in the cylindrical radial direction from the end portion on the other side in the cylindrical axis direction of the plate main body portion 20a is on the other side surface in the cylindrical axis direction of the weight main body portion 30. The weight main body portion 30 is caulked so that the weight main body portion 30 is wound in a state in which the top wall portion 20e extending from the portion to the one side in the cylinder axial direction is in contact with the outer surface of the weight main body portion 30 in the cylinder radial direction.

  According to this reference example, by using the flange portion 15a formed in the outer cylinder 15, the weight 10 can be attached to the outer cylinder 15 which is a generation source of vibration while suppressing distortion of the outer cylinder 15.

(Other embodiments)
The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  In each of the above embodiments, the plate portions 19 and 39 are welded to the outer cylinders 5 and 15 at both end portions 19d, 39d,..., But not limited thereto, for example, the weight main body portions 29 and 49 are attached to the plate portions 19 and 39. In order to ensure the welding strength, the plate portions 19 and 39 are added to the portions other than the both end portions 19d, 39d,... And the both end portions 19d, 39d,. You may weld to the outer cylinders 5 and 15 in this part.

  Further, in the first embodiment, the plate portion 19 that contacts the outer cylinder 5 is applied to the torque rod 1, and the plate portion 39 that is spaced apart from the outer cylinder 15 is applied to the engine mount 11. For example, the plate portion 39 disposed at a distance from the outer cylinder 15 may be combined with the torque rod 1.

  In each of the above embodiments, the plate portions 19 and 39 are set to have plate thicknesses t1 and t2 that are thinner than the thicknesses T1 and T2 of the peripheral walls of the outer cylinders 5 and 15. However, the present invention is not limited to this. The thicknesses t1 and t2 may be the same as the thicknesses T1 and T2 of the peripheral walls of the outer cylinders 5 and 15. In this case, as the material of the plate portions 19 and 39, it is desirable to use a material having the same or less rigidity as the material of the outer cylinders 5 and 15. That is, the thicknesses and materials of the plate portions 19 and 39 with respect to the outer cylinders 5 and 15 can be appropriately combined as necessary as long as the outer cylinder 5 is less likely to be distorted.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention is useful for an anti-vibration device or the like that includes an inner cylinder and an outer cylinder, a rubber elastic body that is provided between the inner cylinder and the outer cylinder, and a mass body that suppresses the resonance amplitude. It is.

It is a perspective view of the torque rod concerning Embodiment 1 of the present invention. It is a top view of a torque rod. It is a side view of a torque rod. It is a top view which shows the attachment state to the transmission and vehicle body of a torque rod. 6 is a perspective view of an engine mount according to Embodiment 2. FIG. It is the figure which looked at the engine mount concerning Embodiment 2 from the direction of a cylinder axis. It is the figure which looked at the engine mount which concerns on a reference example from the cylinder radial direction.

1 Torque rod (anti-vibration device)
3 Inner cylinder 5 Outer cylinder 7 Rubber elastic body 9 Weight (mass body)
19 Plate part 19c Caulking part 19d End part 19h of plate part Tip part of caulking part 29 Weight body part (mass body body)
29a Concave portion 11 Engine mount (vibration isolation device)
13 Inner cylinder 15 Outer cylinder 17 Rubber elastic body 39 Plate portion 39c Caulking portion 39d End portion 39g of plate portion Tip portion 49 of caulking portion Weight main body (mass body main body)
49a recess

Claims (3)

An anti-vibration device comprising an inner cylinder, an outer cylinder provided around the inner cylinder, and a rubber elastic body provided between the inner cylinder and the outer cylinder to connect both;
It further comprises a mass body disposed on the outer peripheral surface of the outer cylinder,
The mass body has a plate thickness equal to or less than the thickness of the outer peripheral wall of the outer cylinder, and a plate part joined to the outer cylinder by welding, and a mass body main body fixed by caulking with the plate part. has,
A recess is formed in the mass body,
The plate portion has a caulking portion for caulking the mass body so as to be wound,
An anti-vibration device according to claim 1, wherein a tip portion of the caulking portion is accommodated in the concave portion . The vibration isolator according to claim 1, wherein
The plate portion extends in a substantially circumferential direction of the outer cylinder as viewed from the cylinder axis direction, and is welded to the outer peripheral surface of the outer cylinder at both ends thereof, and the mass body at a portion other than the both ends. A vibration isolator characterized by caulking the main body. The vibration isolator according to claim 2,
The vibration isolator, wherein the plate portion is attached to an outer peripheral surface of the outer cylinder in a state where a portion other than the both end portions is spaced from the outer peripheral surface of the outer cylinder.

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