JP5986521B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator applied to, for example, an automobile engine mount, motor mount, torque rod, and the like.

  Conventionally, an anti-vibration device is known as a type of anti-vibration coupling body that is interposed between members constituting a vibration transmission system and mutually anti-vibrates the members. As the vibration isolator, for example, as in Japanese Utility Model Publication No. 6-45721 (Patent Document 1), the first bush attached to one member constituting the vibration transmission system and the other constituting the vibration transmission system. A structure in which the second bushes attached to the members are connected to each other with a highly rigid connecting member is known, and is applied to a torque rod or the like of an automobile.

  By the way, in the vibration isolator as described above, it is necessary to form a plurality of cylindrical portions for attaching the first bush and the second bush in the connecting member. A connecting member provided with such a cylindrical portion can be obtained by molding, but it has also been proposed to combine and form bent plates for the purpose of obtaining a cheaper and lighter connecting member. Yes. That is, in Patent Document 1, the connecting member has a structure in which a plate-like first member and a second member are overlapped and fixed, a hole is formed in the first member, and the second member A cylindrical portion for attaching the bush is formed by forming a burring hole at a corresponding position.

  However, like the second member in Patent Document 1, if the plate portion is subjected to burring to form a cylindrical portion, the plate thickness of the cylindrical portion tends to vary on the circumference, and the inner method of the cylindrical portion There is a possibility that the holding force of the bush by the connecting member may not be stable due to a dimensional error. In particular, when the required axial dimension of the cylindrical portion is large, there is a problem that the cylindrical portion becomes excessively thin and it is difficult to obtain sufficient load resistance. On the other hand, if the thickness of the cylindrical portion is sufficiently secured, the connecting member becomes thicker than necessary in a portion other than the cylindrical portion, which causes problems such as an increase in weight and a decrease in yield during manufacturing. There was also a fear.

Japanese Utility Model Publication No. 6-45721

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is a novel structure including a connecting member that can obtain sufficient load resistance with a simple structure that can be easily manufactured. It is to provide a vibration isolator having a structure.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, the first aspect of the present invention provides at least one first bush attached to one member constituting the vibration transmission system and at least one second bush attached to the other member constituting the vibration transmission system. In the anti-vibration device in which the bushes are respectively disposed in the cylindrical portions formed in the connecting member and are connected to each other by the connecting member, the connecting member integrally includes a plurality of groove-like portions extending in parallel. It has a structure in which a set of plate-like divided bodies provided is overlapped face to face, and is configured by a set of the groove-shaped parts by abutting and fixing the open ends of the groove-shaped parts to each other A plurality of the cylindrical portions are connected in parallel to each other, and the connecting member extends between adjacent cylindrical portions and is fixed to the outer peripheral surfaces of the cylindrical portions. It is characterized by having a member.

  According to the vibration isolator having the structure according to the first aspect as described above, the connecting member having a plurality of cylindrical portions has a structure in which a set of plate-like divided bodies is combined. Can be easily formed by bending such as pressing. Moreover, since the cylindrical portion is configured by combining the groove-shaped portions of a set of plate-like divided bodies, the inner diameter dimension of the cylindrical portion is higher in the circumference than when the cylindrical portion is formed by burring. With high accuracy, the variation in strength on the circumference of the cylindrical part is suppressed, and when the first bush and the second bush are fixed by means such as press fitting, the mounting strength is stabilized. It can be obtained and the omission of the bushes can be prevented.

  Further, since the connecting member is provided with a reinforcing member extending between the cylindrical portions, even between the plurality of cylindrical portions whose dimensions are reduced in the overlapping direction of the pair of plate-like divided bodies, Sufficient strength is ensured by the reinforcing member, and deformation of the connecting member is avoided during vibration input.

  In addition, since the connecting member is elastically attached to and supported by the members constituting the vibration transmission system via the first bush and the second bush, the connecting member serves as a mass and the first member A mass-spring resonance system is formed using the spring components of the bush and the second bush as springs. When the vibration is input at a frequency higher than the resonance frequency of the mass-spring resonance system, the connection member is substantially stationary based on the skyhook damper effect, so that vibration transmission between members constituting the vibration transmission system is reduced or reduced. Is avoided. Thereby, it is possible to obtain an excellent anti-vibration effect (vibration insulation effect) against vibration in a high frequency range.

  According to a second aspect of the present invention, in the vibration isolator described in the first aspect, the connecting member includes three or more cylindrical parts, and the first bushes are respectively provided in the cylindrical parts. Alternatively, the second bush is disposed so that the connecting member is elastically supported between the members constituting the vibration system, and the elastic main shaft of the first bush and the elasticity of the second bush. Each of the main shafts is set so as to pass through the center of gravity of the connecting member.

  According to the second aspect, the elastic main shaft of the first bush and the elastic main shaft of the second bush are both set so as to pass through the center of gravity of the connecting member, so that the vibration is input to the connecting member. The exerted moment is reduced, and it is difficult for the connecting member to be twisted or twisted. Thereby, the vibration insulation effect with respect to the vibration of a high frequency region can be effectively obtained using the skyhook damper effect in the mass-spring system using the connecting member as a mass.

  According to a third aspect of the present invention, in the vibration isolator described in the first or second aspect, the reinforcing member is disposed across three or more cylindrical portions, and the three or more Are fixed to the outer peripheral surface of the cylindrical portion.

  According to the 3rd aspect, in a connection member, the weak part between cylindrical parts can be effectively reinforced with few parts number, and sufficient load resistance can be ensured. In addition, load resistance can be improved as compared with the case where reinforcing members are separately provided between the cylindrical portions.

  According to a fourth aspect of the present invention, in the vibration isolator described in any one of the first to third aspects, the reinforcing member has a plate shape, and the reinforcing member is formed of the cylindrical portion. It extends in the tangential direction.

  According to the fourth aspect, the plate-shaped reinforcing member is formed to extend in the tangential direction of the adjacent cylindrical portions, so that the section modulus of the connecting member is increased more effectively, and the reinforcing effect against bending is improved. Further improvement is achieved.

  In addition, when employ | adopting a plate-shaped reinforcement member in this invention, the reinforcement member which has a thickness dimension substantially the same as a plate-shaped division body is employ | adopted suitably. As a result, the reinforcing member and the plate-like divided body can be formed from a common plate material, and the cost can be reduced and material management can be facilitated by sharing the material.

  Moreover, when employ | adopting a plate-shaped reinforcement member in this invention, the reinforcement member extended linearly in a flat plate shape without curved etc. between adjacent cylindrical parts is employ | adopted suitably. Thereby, the deformation | transformation rigidity between the cylindrical parts by a plate-shaped reinforcement member can be exhibited more effectively.

  According to a fifth aspect of the present invention, in the vibration isolator described in any one of the first to fourth aspects, the first bush includes a first inner shaft member and a first outer cylinder member. And a structure in which the second bush is elastically connected to the second inner shaft member and the second outer cylinder member by the second main rubber elastic body. The first bush and the second bush are respectively press-fitted into the cylindrical portion of the connecting member.

  According to the fifth aspect, since the first bush and the second bush are formed separately from the connecting member, the molding die for the first main rubber elastic body and the second main rubber elastic body is provided. Can be small. Moreover, since the first bush and the second bush are the inner and outer cylinder bonding type bushes in which the inner shaft member and the outer cylinder member are elastically connected by the main rubber elastic body, the outer cylinder member is the cylindrical portion of the connection member. The first bush and the second bush can be firmly fixed to the center hole of the cylindrical portion by press-fitting into the cylindrical portion.

  According to a sixth aspect of the present invention, in the vibration isolator described in any one of the first to fifth aspects, the opening of the groove-shaped portion in the plate-like divided body has the groove-shaped portion. Abutting portions projecting outward in the width direction are integrally formed, and a pair of the plate-like divided bodies are overlapped with each other so that the corresponding contact portions of the plate-like divided bodies are in contact with each other. And a welding hole penetrating in the thickness direction is formed in any one of the corresponding contact portions, and the corresponding contact portion of the pair of plate-like divided bodies is formed on the inner surface of the welding hole. They are welded and fixed to each other.

  According to the 6th aspect, a set of plate-shaped division body can be positioned easily by overlapping in a contact part. Moreover, since the overlapped contact portions are welded and fixed to each other on the inner surface of the welding hole, welding work is performed outside the cylindrical portion by inserting a torch on the outer side in the width direction of the groove-like portion. Can do. In addition, the contact part located between the cylindrical parts arrange | positioned adjacently is formed in the width | variety which can insert a torch and can perform a welding operation.

  According to a seventh aspect of the present invention, in the vibration isolator described in any one of the first to sixth aspects, the opening end portion of the groove-shaped portion in the set of plate-like divided bodies is in a contact state. The opening end portions of these groove-like portions are welded from the inner peripheral side of the tubular portion and fixed to each other, and the internal dimensions of the tubular portion are partially increased. The enlarged portion is provided at the opening end of the groove-like portion, and the weld metal fixed to the inner peripheral surface of the cylindrical portion is accommodated in the enlarged portion.

  According to the seventh aspect, by welding the opening end portion of the groove-shaped portion from the inner peripheral side of the cylindrical portion, there is no need to set a gap for welding between adjacent cylindrical portions, The compaction in the adjacent direction of the cylindrical portion is achieved. In addition, the weld metal fixed to the inner peripheral surface of the cylindrical portion is accommodated in the enlarged portion where the internal dimensions are partially increased on the periphery of the cylindrical portion, so that the weld metal becomes the first bush. This prevents interference with the second bushing, poor mounting of the first bushing and the second bushing to the cylindrical portion, damage due to contact of the first bushing and the second bushing with the weld metal, etc. Is avoided.

  According to the present invention, since the connecting member having a plurality of cylindrical portions has a structure in which a set of plate-like divided bodies are overlapped and fixed face to face, the plate material is subjected to bending such as pressing. By applying, the connecting member can be easily obtained, and excellent dimensional accuracy can be realized in each part including the cylindrical portion. Moreover, since the connecting member is provided with a reinforcing member that extends over a plurality of cylindrical portions, sufficient strength is ensured even between adjacent cylindrical portions, and a connecting member having excellent load resistance is realized. Is done.

The perspective view which shows the motor mount as 1st embodiment of this invention. The perspective view which shows the motor mount shown in FIG. 1 from another angle. The top view of the motor mount shown by FIG. The bottom view of the motor mount shown by FIG. The front view of the motor mount shown by FIG. The right view of the motor mount shown by FIG. VII-VII sectional drawing of FIG. The perspective view of the bracket which comprises the motor mount shown by FIG. The perspective view which shows the bracket shown by FIG. 8 from another angle. The right view which shows the motor mount as 2nd embodiment of this invention. The right view which shows the motor mount as 3rd embodiment of this invention. FIG. 12 is a plan view of the motor mount shown in FIG. 11.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 7 show a motor mount 10 for an automobile as a first embodiment of a vibration isolator having a structure according to the present invention. The motor mount 10 has a structure in which one first bush 12 and two second bushes 14, 14 are attached to each other by being attached to a bracket 16 as a connecting member. In the following description, in principle, the vertical direction is the vertical direction in FIG. 6 which is the main vibration input direction, and the front-back direction is the vertical direction in FIG. The left-right direction refers to the left-right direction in FIG. 3 that is the left-right direction of the vehicle in the mounted state.

  More specifically, the first bush 12 has a structure in which a first inner shaft member 18 and a first outer cylinder member 20 are elastically connected by a first main rubber elastic body 22. The first inner shaft member 18 is a highly rigid member made of iron, aluminum alloy, or the like, and has a thick and small diameter cylindrical shape. The first outer cylinder member 20 is a high-rigidity member made of the same material as that of the first inner shaft member 18, and has a thin and large diameter as compared with the first inner shaft member 18. It has a cylindrical shape.

  The first inner shaft member 18 and the first outer cylinder member 20 are coaxially arranged in an internal / external insertion state, and are elastically connected by a first main rubber elastic body 22. The first main rubber elastic body 22 has a thick, large-diameter, generally cylindrical shape. The inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the first inner shaft member 18, and the outer peripheral surface is the first. The first inner shaft member 18 and the first outer cylinder member 20 are elastically connected by the first main rubber elastic body 22 by being vulcanized and bonded to the inner peripheral surface of the one outer cylinder member 20. . The first main rubber elastic body 22 is formed as an integrally vulcanized molded product including the first inner shaft member 18 and the first outer cylinder member 20.

  Further, the first main rubber elastic body 22 is formed with an upper straight hole 24 and a lower straight hole 26 penetrating in the axial direction on either one of the upper and lower sides sandwiching the first inner shaft member 18. With the upper and lower straight holes 24 and 26, the first main rubber elastic body 22 has a pair of front and rear connecting arm portions 28 that elastically connect the first inner shaft member 18 and the first outer cylinder member 20 to each other. , 28 and an upper stopper portion 30 and a lower stopper portion 32 which are fixed to the first outer cylinder member 20 and are opposed to the first inner shaft member 18 in the vertical direction.

  The first inner shaft member 18 and the first outer cylinder member 20 are brought into contact with each other via the upper and lower stopper portions 30 and 32, so that the first inner shaft member 18 and the first outer cylinder member 20 are vertically moved. Upper and lower stopper means for limiting the relative displacement amount in the direction are configured.

  On the other hand, the second bush 14 has a smaller diameter than the first bush 12, and the second inner shaft member 34 and the second outer cylinder member 36 are elastically supported by the second main rubber elastic body 38. It is a connected structure. The second inner shaft member 34 is a highly rigid member similar to the first inner shaft member 18 and has a substantially cylindrical shape with a thick and small diameter. The second outer cylinder member 36 is a highly rigid member similar to the first outer cylinder member 20, and has a thin cylindrical shape with a large diameter.

  And the 2nd inner shaft member 34 and the 2nd outer cylinder member 36 are coaxially arrange | positioned in the internal / external insertion state, These 2nd inner shaft members 34 and the 2nd outer cylinder member 36 are the 2nd main body. The rubber elastic body 38 is elastically connected. The second main rubber elastic body 38 has a thick, large-diameter, generally cylindrical shape. The inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the second inner shaft member 34, and the outer peripheral surface is the first. By being vulcanized and bonded to the inner peripheral surface of the second outer cylinder member 36, the second inner cylinder member 34 and the second outer cylinder member 36 are interposed. The second main rubber elastic body 38 is formed as an integrally vulcanized molded product including the second inner shaft member 34 and the second outer cylinder member 36. In the present embodiment, the two second bushes 14 and 14 have the same structure.

  Furthermore, the second main rubber elastic body 38 is opposed to the pair of first straight holes 40, 40 facing each other in the vertical direction and facing each other in the front-rear direction (left and right in FIG. 6). A pair of second straight holes 42 are formed so as to penetrate the second main rubber elastic body 38 in the axial direction. The first and second straight holes 40 and 42 extend in the circumferential direction by a predetermined length, and the first widened portion 44 that extends to the inner peripheral side at both circumferential ends of the first straight hole 40. On the other hand, a second widened portion 46 extending to the outer peripheral side is formed at both ends in the circumferential direction of the second straight hole 42. As a result, the second main rubber elastic body 38 is integrally formed with a first stopper portion 48 that protrudes upward and downward from the second inner shaft member 34 on the inner peripheral side of the first straight hole 40. A second stopper portion 50 is formed on the outer peripheral side of the second straight hole 42 so as to protrude inward in the front-rear direction from the second outer cylinder member 36.

  Then, the second inner shaft member 34 and the second outer cylinder member 36 come into contact with each other via the first stopper portion 48, so that the second inner shaft member 34 and the second outer cylinder member 36 are vertically moved. The upper and lower stopper means for limiting the relative displacement amount of the upper and lower portions is configured. Further, when the second inner shaft member 34 and the second outer cylinder member 36 come into contact with each other via the second stopper portion 50, the second inner shaft member 34 and the second outer cylinder member 36 are moved in the front-rear direction. Front / rear stopper means for restricting the relative displacement amount is configured.

  The first bush 12 and the second bush 14 having such a structure are attached to the bracket 16. The bracket 16 is a highly rigid member made of a metal material such as iron or aluminum alloy, and has a structure in which a reinforcing member 54 is attached to the bracket body 52 as shown in FIGS. ing.

  More specifically, the bracket main body 52 includes three cylindrical portions 56, 58, and 58 that are arranged side by side in the front-rear direction with the front-rear direction being the longitudinal direction. In the bracket 16 of the present embodiment, a first cylindrical portion 56 having a large diameter is provided in the center in the front-rear direction, and the first cylindrical portion 56 is adjacent to both front and rear sides of the first cylindrical portion 56. The second cylindrical portions 58 and 58 having a smaller diameter are provided.

  Furthermore, the bracket main body 52 has a structure in which a pair of plate-like divided bodies 60a and 60b are overlapped in the vertical direction. The plate-like divided body 60 is formed in a longitudinal plate shape as a whole, and has a first groove-like portion 62 extending at the central portion in the front-rear direction with a substantially semicircular cross section extending over the entire length in the left-right direction. Second groove portions 64, 64 are formed on both sides of the one groove portion 62 so as to extend in the left-right direction with a substantially semicircular arc cross section. The first groove-like portion 62 has a substantially semicircular cross section having a larger diameter than the second groove-like portion 64, and the groove width dimension (front-rear dimension) and groove depth dimension (vertical dimension) are increased. However, the opening end face of the first groove-like portion 62 and the opening end face of the second groove-like portion 64 are located on substantially the same plane.

  Further, an intermediate contact portion 66 is integrally formed as a contact portion that is continuous over the entire length in the left-right direction between the first groove-shaped portion 62 and the second groove-shaped portion 64. The intermediate contact portion 66 has a plate shape that extends substantially perpendicular to the vertical direction, and both end portions in the front-rear direction are open end portions of the first groove portion 62 and open end portions of the second groove portion 64. Are integrally connected to each of the parts. Further, slots 68 as welding holes are formed in the intermediate contact portions 66, 66 of the plate-like divided body 60b. The slot 68 is a long hole that vertically penetrates the central portion of the intermediate abutting portion 66, and continuously extends with a predetermined length in the left-right direction of the plate-like divided body 60b.

  Further, an end abutting piece 70 as an abutting portion is integrally formed at the opening end on the outer side in the front-rear direction of the second groove-shaped portion 64. The end contact piece 70 has a plate shape that extends on the same plane as the intermediate contact portion 66, and protrudes outward in the front-rear direction from the opening end of the second groove-shaped portion 64. Furthermore, notch portions 72 serving as welding holes are respectively formed in the end contact pieces 70, 70 of the plate-like divided body 60b. The notch 72 penetrates the end of the end contact piece 70 on the outer side in the front-rear direction, and extends at a predetermined length in the left-right direction at the center in the left-right direction. In short, each of the opening end portions of the first groove-like portion 62 and the second groove-like portion 64 has either an intermediate contact portion 66 or an end contact piece 70 protruding outward in the groove width direction (front-rear direction). Are integrally formed.

  The plate-like divided body 60a and the plate-like divided body 60b having such a structure are stacked so as to face each other in the vertical direction, and the opening end portions of the first groove-shaped portion 62 are abutted with each other. The open end portions of the two groove portions 64 and 64 are abutted with each other. Accordingly, the intermediate contact portions 66 and 66 and the end contact pieces 70 and 70 provided at the opening end portions of the first and second groove-shaped portions 62, 64, and 64 are overlapped with each other in a contact state. The intermediate contact portion 66 of the plate-like divided body 60a and the intermediate contact portion 66 of the plate-like divided body 60b are welded at the slot 68, and the end contact piece 70 of the plate-like divided body 60a and the plate The plate-like divided body 60 a and the plate-like divided body 60 b are fixed to each other by welding the end contact piece 70 of the shaped divided body 60 b at the notch 72.

  The method for welding the intermediate contact portion 66 and the end contact piece 70 is not particularly limited, but the weld metal is destroyed when the first and second bushes 12, 14, and 14 described later are press-fitted. Since sufficient load resistance is required so as not to occur, for example, a linear weld metal 74 (bead) is formed by continuous welding over a wide range in the left-right direction by arc welding. Is desirable. However, various known welding methods such as electron beam welding, gas welding, electroslag welding, and induction heating welding can be employed depending on the required strength and the like.

  By fixing the plate-like divided body 60a and the plate-like divided body 60b, the opening end portions of the first groove-like portions 62 of the plate-like divided bodies 60a and 60b are connected to each other, and the first and second groove portions 60a and 60b A cylindrical portion 56 is formed, and the opening end portions of the second groove portions 64 and 64 of the plate-like divided bodies 60a and 60b are connected to each other, and the second cylindrical shape is formed at both end portions in the front-rear direction. Portions 58 and 58 are formed. Thereby, the bracket main body 52 in which the three cylindrical portions 56, 58, 58 are connected is formed.

  A reinforcing member 54 is attached to the plate-like divided body 60 b of the bracket body 52. The reinforcing member 54 is a highly rigid member having a long plate shape, the width dimension (dimension in the left-right direction) is substantially the same as that of the bracket body 52, and the plate thickness dimension constitutes the bracket body 52. The thickness of the plate-like divided bodies 60a and 60b is substantially the same. Further, the reinforcing member 54 is provided with a bent portion 76 at a central portion in the front-rear direction, and gradually inclines as it goes outward in the front-rear direction. Furthermore, a central slot 78 having a long hole shape extending in the left-right direction with a predetermined length is formed in the bent portion 76 of the reinforcing member 54 so as to penetrate in the thickness direction.

  In the reinforcing member 54, a bent portion 76, which is a central portion in the front-rear direction, is overlapped with the lower end of the outer peripheral surface of the first cylindrical portion 56, and both end portions in the front-rear direction are respectively connected to the second cylindrical portions 58, 58 is overlapped on the outer peripheral surface of 58 and disposed across the first cylindrical portion 56 and the second cylindrical portions 58 and 58. The front and rear central portions of the reinforcing member 54 are welded and fixed to the outer peripheral surface of the first cylindrical portion 56 in the central slot 78, and the front and rear end portions of the reinforcing member 54 are connected to the outer peripheral surface of the second cylindrical portion 58 at the end surfaces. The bracket 16 is formed by welding and fixing. The reinforcing member 54 is inclined at an angle in which both front and rear side portions sandwiching the bent portion 76 are in contact with the outer peripheral surface of the first cylindrical portion 56 and the outer peripheral surface of the second cylindrical portion 58, respectively. Extends in the common tangential direction between the outer peripheral surface of the first cylindrical portion 56 and the outer peripheral surface of the second cylindrical portion 58. The reinforcing member 54 is continuously welded to the first cylindrical portion 56 and the second cylindrical portion 58 over the entire length in the left-right direction, and a linear weld metal 80 is formed. .

  In the bracket 16 of the present embodiment, the plate-like divided bodies 60a and 60b and the reinforcing member 54 are both plate members, and the plate-like divided bodies 60a and 60b and the reinforcing member 54 that can be easily formed are welded to each other. It is possible to manufacture easily by fixing to. In addition, the first cylindrical portion 56 is formed by combining the first groove-like portions 62 of the plate-like divided bodies 60a and 60b, and the second cylindrical portions 58 and 58 are the second ones of the plate-like divided bodies 60a and 60b. Since the two groove portions 64, 64 are formed in combination, the cylindrical portions 56, 58, 58 are easily formed by bending the plate-like divided bodies 60a, 60b such as a press.

  The first bush 12 and the second bushes 14 and 14 are attached to the bracket 16 formed in this way. That is, the first outer cylindrical member 20 of the first bush 12 is press-fitted and fixed to the first cylindrical portion 56 of the bracket 16, and the second bushing 14 of the second bush 14 is fixed to the second cylindrical portion 58 of the bracket 16. The outer cylinder member 36 is press-fitted and fixed. Thereby, the motor mount 10 in which the first bush 12 and the two second bushes 14, 14 are connected by the bracket 16 is formed.

  As shown in FIG. 3, the motor mount 10 is attached to a power unit 82 including a motor that is a first inner shaft member 18 of the first bush 12 and is a member constituting a vibration transmission system. The second inner shaft members 34, 34 of the second bushes 14, 14 are both attached to the vehicle body 84, which is the other member constituting the vibration transmission system. As a result, the power unit 82 is connected to the vehicle body 84 in a vibration-proof manner via the motor mount 10.

  Further, when the motor mount 10 is mounted on the vehicle, the bracket 16 of the motor mount 10 is elastically supported between the power unit 82 and the vehicle body 84. Thus, a mass-spring system is formed in which the bracket 16 is a mass and the first main rubber elastic body 22 and the second main rubber elastic bodies 38, 38 are springs. The resonance frequency of the mass-spring system is set to a frequency lower than the frequency of the vibration to be insulated, which will be described later, and is preferably set to 1 / √2 times or less the frequency of the vibration to be insulated. Specifically, the resonance frequency of the mass-spring system is desirably set between 50 Hz and 2000 Hz, and more preferably between 80 Hz and 500 Hz.

  Moreover, in the motor mount 10 of this embodiment, the 1st bush 12 is made into the substantially symmetrical shape with respect to the axial plane which spreads in the center of an axial direction, The elastic main axis | shaft of the up-down direction has the center of front-back and left-right. It extends vertically. Further, like the first bush 12, the second bushes 14 and 14 have a substantially symmetrical shape with respect to the axial straight plane extending at the center in the axial direction, and the bracket 16 extends at the center in the front-rear direction. It is made into a substantially symmetrical shape with respect to the plane (the one-dot chain line in FIG. 6), and the combined vertical elastic main shafts of the second bushes 14 and 14 extend vertically in the front and rear and left and right centers, It substantially coincides with the elastic main shaft of the first bush 12.

  Further, in the motor mount 10, the bracket 16 has a substantially symmetrical shape with respect to a surface (indicated by a one-dot chain line in FIG. 6) extending in the front-rear direction, and a surface (one point in FIG. 5) extending in the left-right direction. The center of gravity is located on an imaginary line extending up and down in the front and rear and right and left centers. Thus, the elastic main shaft of the first bush 12 and the elastic main shaft of the second bushes 14 and 14 are both set to pass through the center of gravity of the bracket 16.

  When the vertical vibration of the power unit 82 is input to the motor mount 10 in such a mounting state of the motor mount 10 on the vehicle, the first main rubber elastic body 22 of the first bush 12 and the second bush 14 , 14 is elastically deformed, and a vibration isolating effect due to an energy damping action or the like due to internal friction is exhibited.

  The input vibration is higher than the resonance frequency of the mass-spring system composed of the bracket 16 and the main rubber elastic bodies 22, 38, 38, more specifically, √2 times the resonance frequency of the mass-spring system. If the vibration is to be insulated at a higher frequency than the bracket 16, the bracket 16 enters a vibration-proof region where it is hardly displaced by the skyhook damper effect, so that transmission of vibration is blocked between the power unit 82 and the vehicle body 84. Thereby, an excellent vibration insulating effect is exhibited against high-frequency vibration such as motor noise.

  In particular, in this embodiment, since the elastic main shaft of the first bush 12 and the elastic main shaft of the composite spring of the second bushes 14 and 14 are both set so as to pass through the center of gravity of the bracket 16, At the time of vibration input, the action of the moment on the bracket 16 is reduced or avoided, and the bracket 16 is less likely to be displaced other than the vertical displacement. Therefore, the vibration isolation effect as described above can be effectively obtained at the target vibration frequency.

  Moreover, the upper and lower elastic main shafts of the first bush 12 and the upper and lower elastic main shafts of the composite springs of the second bushes 14 and 14 substantially coincide with each other, and the center of gravity of the bracket 16 is set on these elastic main shafts. Therefore, the moment acting on the bracket 16 can be reduced more effectively, and the vibration insulation effect can be effectively obtained.

  In the motor mount 10, the bracket main body 52 including the cylindrical portions 56, 58, 58 is a set of plate-like divided bodies 60 a, 60 b that are formed into a predetermined shape by bending a plate material such as a press. It is configured by combining. Therefore, the plate thickness of the plate-like divided bodies 60a, 60b can be made substantially constant over the entire portion including the cylindrical portions 56, 58, 58, and stress concentration due to the difference in thickness can be avoided. . In addition, the cylindrical portions 56, 58, 58 can be formed with a substantially constant thickness on the circumference, and in particular, the inner circumferential surface is located on the same cylindrical surface over substantially the entire first. The load bearing performance by press-fitting and fixing the bush 12 and the second bush 14 can be obtained efficiently and stably.

  Further, the pair of plate-like divided bodies 60a and 60b are overlapped in a contact state with each other at the intermediate contact portions 66 and 66 and the end contact pieces 70 and 70 that spread substantially perpendicular to the overlapping direction. Thus, the pair of plate-like divided bodies 60a and 60b can be easily positioned before welding. In addition, slots 68 are formed in the intermediate contact portions 66 and 66 of the plate-like divided body 60b, respectively, and notches 72 are formed in the end contact pieces 70 and 70 of the plate-like divided body 60b. The plate-like divided bodies 60a, 60b are welded and fixed at the intermediate contact portions 66, 66 and the end contact pieces 70, 70 by work from outside the cylindrical portions 56, 58, 58. Since such an external welding operation is possible, the welding operation is simple, and the quality of welding can be stabilized.

  In addition, the bracket main body 52 is a portion that is vulnerable to input in the vertical direction between the adjacent first cylindrical portion 56 and the second cylindrical portions 58 and 58 (intermediate contact portions 66 and 66). Such a fragile portion is reinforced by a reinforcing member 54 extending between the first cylindrical portion 56 and the second cylindrical portions 58 and 58. Thereby, even if it uses the bracket main body 52 comprised combining the board | plate material, the bracket 16 provided with sufficient rigidity is realizable.

  Further, the reinforcing member 54 having a flat plate shape is disposed so as to extend in the common tangential direction of the first cylindrical portion 56 and the second cylindrical portions 58 and 58, and the outer periphery of the cylindrical portions 56, 58 and 58. It is fixed to the surface. Thereby, between the adjacent 1st cylindrical part 56 and the 2nd cylindrical parts 58 and 58, the distance from the center in an up-down direction to a reinforcement member is set large. Therefore, since the section modulus of the bracket 16 is efficiently set large between the first cylindrical portion 56 and the second cylindrical portions 58 and 58 disposed adjacent to each other, the cross-sectional shape is relatively large. Even with a small plate-shaped reinforcing member 54, the strength of the bracket 16 can be sufficiently increased.

  Furthermore, since the reinforcing member 54 of the present embodiment extends continuously over the three cylindrical portions 56, 58, 58, an effective reinforcing effect is exhibited with a small number of parts. In addition, the bent portion 76 that is the central portion of the reinforcing member 54 is superimposed on the outer peripheral surface of the central portion in the front-rear direction of the first cylindrical portion 56, and both end portions of the reinforcing member 54 are the second cylindrical portion 58. , 58 extends outward from the center in the front-rear direction. Thereby, at the time of vibration input in the vertical direction, stress concentration on the weld metal 80 is relaxed, and durability is improved.

  Further, the plate-like divided bodies 60a and 60b and the reinforcing member 54 constituting the bracket 16 have substantially the same thickness and width, and the common use of the forming material reduces the cost, manufacture, and material management. Simplification and the like are realized.

  FIG. 10 shows a motor mount 90 for an automobile as a second embodiment of the vibration isolator having a structure according to the present invention. The motor mount 90 has a structure in which the first bush 12 and the second bushes 14 and 14 are attached to a bracket 92 as a connecting member. The bracket 92 includes a bracket main body 94 to which the first bush 12 and the second bushes 14 and 14 are attached, and a reinforcing member 54 fixed to the bracket main body 94. In addition, in the following description, about the member and site | part substantially the same as 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  More specifically, the bracket body 94 has a longitudinal shape in the front-rear direction, and a first cylindrical portion 96 formed at the center portion in the front-rear direction and on both front and rear sides of the first cylindrical portion 96. Two second cylindrical portions 98 and 98 are formed. Further, the bracket body 94 is configured by overlapping and fixing a pair of plate-like divided bodies 100a and 100b facing each other.

  The plate-like divided body 100 has a long plate shape, and a first groove-like portion 102 that opens in the thickness direction and extends in the left-right direction is formed at the central portion in the front-rear direction, and the first groove-like portion 102. On both sides in the front-rear direction, second groove-shaped portions 104 that open in the thickness direction and extend in parallel with the first groove-shaped portion 102 are formed. The three groove portions 102, 104, and 104 are arranged adjacent to each other in the front-rear direction, and the first groove portions 102 located at the center in the front-rear direction are second groove portions 104 located on both sides in the front-rear direction. , 104 is wider and deeper. Further, the groove portions 102, 104, 104 all have a substantially arc-shaped cross section at the bottom, and the radius of curvature of the opening portion 105 is larger than the radius of curvature of the bottom portion. Here, the opening 105 has an inclined flat plate cross section that gradually expands toward the opening. Thereby, the groove part 102,104,104 of this embodiment has the opening part 105 width direction with respect to the groove part 62,64,64 of the semicircular arc cross section shown by 1st embodiment. Located on the outside.

  Further, intermediate contact portions 106 are formed between the opening end portions of the first groove-like portion 102 and the second groove-like portions 104, 104, respectively. The intermediate contact portion 106 has a convex curved shape on the overlapping surface side of the plate-like divided bodies 100a and 100b, and the groove-like portions 102, 104, and 104 are continuously provided in a curved shape in a wavy shape. Yes. The intermediate contact portion 106 is not formed with the slot 68 like the intermediate contact portion 66 of the first embodiment. Furthermore, end contact pieces 70 are integrally formed at the opening ends of the second groove-shaped portions 104, 104 on the outer side in the front-rear direction, similarly to the first embodiment, and the end of the plate-like divided body 100b is formed. A notch 72 is formed in the part contact piece 70.

  The pair of plate-like divided bodies 100a and 100b having such a structure is overlapped face to face, so that the intermediate contact portions 106 and 106 and the end contact pieces 70 and the plate-like divided bodies 100a and 100b are arranged. 70 are abutted in contact with each other. The plate-like divided bodies 100a and 100b are fixed to each other by welding the intermediate contact portions 106 and 106 and welding the end contact pieces 70 and 70, so that the bracket body 94 is fixed. Composed. Note that the intermediate contact portions 106 are continuously welded over the entire length in the left-right direction.

  In the bracket main body 94, the first tubular portion 96 is constituted by the first groove-like portion 102 of the plate-like divided body 100a and the first groove-like portion 102 of the plate-like divided body 100b, and the second tubular shape. The portions 98 and 98 are constituted by the second groove portions 104 and 104 of the plate-like divided body 100a and the second groove portions 104 and 104 of the plate-like divided body 100b. In the present embodiment, the opening portions 105 of the groove-like portions 102, 104, 104 are all inclined flat plates and have a larger radius of curvature than the bottom portion. On the inner peripheral surface, a pair of enlarged portions 108 and 108 each having a large internal dimension are formed. Thereby, the inner peripheral surfaces of the cylindrical portions 96, 98, 98 are plate-shaped with respect to the outer peripheral surfaces of the first and second bushes 12, 14, 14 that are press-fitted into the cylindrical portions 96, 98, 98. It is located on the outer side in the width direction in the vicinity of the overlapping surface of the divided bodies 100a and 100b.

  Further, the intermediate contact portions 106 and 106 of the plate-like divided body 100a and the intermediate contact portions 106 and 106 of the plate-like divided body 100b are welded from the inner peripheral sides of the cylindrical portions 96, 98, and 98, respectively. In this case, the weld metal 110 (bead) fixed to the intermediate contact portions 106, 106 from the inner peripheral side of the cylindrical portions 96, 98, 98 is the inner periphery of each cylindrical portion 96, 98, 98. It is accommodated in enlarged portions 108, 108 provided on the surface. As a result, the weld metal 110 does not interfere with the first outer cylinder member 20 of the first bush 12 and the second outer cylinder member 36 of the second bush 14, and the first and second outer cylinders. It is positioned on the outer peripheral side of the members 20 and 36.

  According to the motor mount 90 according to this embodiment, the torch is inserted into the cylindrical portions 96, 98, 98 when the bracket main body 94 is formed by fixing the pair of plate-like divided bodies 100a, 100b. By doing so, the welding operation of these plate-like divided bodies 100a and 100b can be easily performed. Therefore, it is not necessary to provide a space for inserting the torch between the first groove-like portion 102 and the second groove-like portions 104, 104, and the size of the bracket body 94 and the motor mount 90 can be reduced in the front-rear direction. It is done.

  11 and 12 show a motor mount 120 for an automobile as a third embodiment of the vibration isolator having a structure according to the present invention. The motor mount 120 has a structure in which a first bush 12 and second bushes 14 and 14 are attached to a bracket 122 as a connecting member. The bracket 122 has a structure in which a plate-like reinforcing member 124 is attached to a bracket main body 52 including three cylindrical portions 56, 58, 58.

  The reinforcing member 124 has a rounded rectangular plate shape, and a mounting hole 126 corresponding to the outer shape of the bracket main body 52 is formed through the central portion thereof in the thickness direction. The bracket body 52 is inserted into the mounting hole 126, and the reinforcing member 124 is disposed so as to spread substantially orthogonal to the axial direction of the cylindrical portions 56, 58, 58, and the peripheral portion of the mounting hole 126 is welded. As a result, the bracket body 52 and the reinforcing member 124 are fixed to each other by welding. As is clear from FIGS. 11 and 12, the thickness direction of the reinforcing member 124 substantially coincides with the central axis direction of the cylindrical portions 56, 58, and 58.

  According to the motor mount 120 of this embodiment, the reinforcing member 124 spreads substantially orthogonal to the axial direction of the cylindrical portions 56, 58, 58, and the thickness direction of the reinforcing member 124 is the main vibration load. It is substantially orthogonal to the vertical direction, which is the input direction. Therefore, the plate-shaped reinforcing member 124 can sufficiently obtain the strength against the input in the vertical direction.

  In addition, since the bracket body 52 is inserted into the mounting hole 126 of the reinforcing member 124, separation of the plate-like divided bodies 60 a and 60 b constituting the bracket body 52 is prevented by the reinforcing member 124, and the load resistance of the bracket body 52 is The improvement of property is also achieved.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in the above-described embodiment, the structure in which one first bush 12 and two second bushes 14 and 14 are disposed is illustrated. However, the first bush and the second bush attached to the connecting member are illustrated. The number is not limited to three, and one first bush and one second bush may be provided, or four or more bushes may be provided. However, in order to easily reduce or eliminate the moment acting on the connecting member when the vertical vibration is input, it is desirable that the connecting member is supported by three or more bushes.

  Further, as the bush, in the outerless type in which the main rubber elastic body is fixed to the outer peripheral surface of the inner shaft member, or in the state where the inner shaft member is inserted and disposed in the cylindrical portion of the connecting member, the inner shaft member and the cylindrical portion are arranged. A vulcanized adhesive type or the like that vulcanizes and molds the main rubber elastic body between the radial directions can also be adopted. Furthermore, for the purpose of improving the vibration isolation performance (vibration damping performance), various known fluid-filled cylindrical vibration isolation devices can be employed as the first and second bushes.

  Furthermore, in the above-described embodiment, the two second bushes 14 and 14 have the same structure. However, when a plurality of second bushes are arranged in this way, the second bushes are arranged. May have different structures. Similarly, when a plurality of first bushes are provided, the first bushes may have different structures.

  Moreover, as a fixing means of a set of plate-like divided bodies, means such as bolt fixing and caulking fixing can be adopted in addition to fixing by welding.

  Further, the reinforcing member is not limited to a plate shape, and may be a rod shape or the like. Furthermore, the reinforcing member does not necessarily have to extend in the tangential direction of the cylindrical portion, for example, may extend along the outer peripheral surface of the cylindrical portion, or both end portions may be extended with respect to the outer peripheral surface of the cylindrical portion. And may be fixed in a substantially orthogonal state.

  Further, the reinforcing members can be provided on both the upper and lower sides with respect to the cylindrical portion depending on the required load bearing performance. In that case, the reinforcing members on both the upper and lower sides may be provided integrally, or may be provided separately.

  Moreover, although the example which uses the vibration isolator of this invention for the motor mount of a motor vehicle was shown in the said embodiment, the vibration isolator of this invention can be applied also to an engine mount, a torque rod, etc., for example. Furthermore, the application range of the present invention is not limited to automobiles, and can be suitably applied to vibration isolators used for motorcycles, railway vehicles, industrial vehicles, and the like.

10, 90, 120: motor mount (vibration isolation device), 12: first bush, 14: second bush, 16, 92, 122: bracket (connection member), 18: first inner shaft member, 20 : First outer cylinder member, 22: first main rubber elastic body, 34: second inner shaft member, 36: second outer cylinder member, 38: second main rubber elastic body, 54, 124: Reinforcing member, 56, 96: first tubular portion, 58, 98: second tubular portion, 60, 100: plate-like divided body, 62, 102: first groove portion, 64, 104: second groove shape Part, 66, 106: intermediate contact part (contact part), 68: slot (welding hole), 70: end contact piece (contact part), 72: notch part (welding hole), 108 : Enlarged part, 110: Weld metal

Claims (7)

A cylinder in which at least one first bush attached to one member constituting the vibration transmission system and at least one second bush attached to the other member constituting the vibration transmission system are formed on the connecting member. In the anti-vibration device that is disposed in each of the sections and connected to each other by the connecting member,
The connecting member has a structure in which a pair of plate-like divided bodies integrally provided with a plurality of groove-shaped portions extending in parallel are overlapped with each other, and the opening ends of the groove-shaped portions are mutually connected. While abutting and fixing, a plurality of the cylindrical parts constituted by a set of the groove-like parts are connected in parallel with each other,
The coupling member includes a reinforcing member that extends between adjacent cylindrical portions and is fixed to the outer peripheral surface of the cylindrical portions.   The connecting member includes three or more cylindrical portions, and the first bush or the second bush is disposed on each of the cylindrical portions, so that the connecting member causes the vibration system. The elastic main shaft of the first bush and the elastic main shaft of the second bush are set so as to pass through the center of gravity of the connecting member. The vibration isolator as described.   The vibration isolator according to claim 2, wherein the reinforcing member is disposed so as to straddle the three or more cylindrical portions, and is fixed to the outer peripheral surface of the three or more cylindrical portions.   The vibration isolator according to any one of claims 1 to 3, wherein the reinforcing member has a plate shape, and the reinforcing member extends in a tangential direction of the cylindrical portion.   The first bush has a structure in which a first inner shaft member and a first outer cylinder member are elastically connected by a first main rubber elastic body, and the second bush is a second inner shaft member. And the second outer cylindrical member are elastically connected by a second main rubber elastic body, and the first bush and the second bush are press-fitted into the cylindrical portion of the connecting member, respectively. The vibration isolator of any one of Claims 1-4.   A contact portion that protrudes outward in the width direction of the groove-shaped portion is integrally formed in the opening of the groove-shaped portion in the plate-shaped divided body, and the pair of plate-shaped divided bodies face each other. By being overlapped, the corresponding contact portions of the plate-like divided bodies are overlapped with each other, and a welding hole penetrating in the thickness direction is formed in any one of the corresponding contact portions. The vibration isolator according to any one of claims 1 to 5, wherein corresponding contact portions of the pair of plate-like divided bodies are welded to each other on the inner surface of the welding hole.   The opening ends of the groove portions in the set of plate-like divided bodies are abutted in contact with each other, and the opening ends of the groove portions are welded from the inner peripheral side of the cylindrical portion to each other. The cylindrical portion is provided with an enlarged portion whose internal dimension is partially enlarged at the opening end of the groove portion, and is fixed to the inner peripheral surface of the cylindrical portion. The vibration isolator according to any one of claims 1 to 6, wherein the weld metal is accommodated in the enlarged portion.

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