JP5829156B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator used for, for example, an automobile engine mount.

  Conventionally, there has been known an anti-vibration device that is interposed between members constituting a vibration transmission system and that mutually anti-vibrates and supports the anti-vibration of these members, and is applicable to an engine mount for an automobile. It is being considered. This engine mount has a structure in which a first attachment member attached to one member constituting a vibration transmission system and a second attachment member attached to the other member are elastically connected by a main rubber elastic body. For example, Japanese Patent Laid-Open No. 2012-2328 (Patent Document 1) shows this.

  By the way, in the structure disclosed in Patent Document 1, the second attachment member is attached to the other member constituting the vibration transmission system such as a vehicle body via an outer bracket. The outer bracket has a gate shape and has both a gate fitting attached to a vehicle body or the like at both ends, and a cylindrical portion for connecting the gate fitting to the second attachment member. By being press-fitted into the cylindrical portion of the bracket, the bracket is fixed to the second mounting member.

  However, such a structure of the outer bracket requires that the second mounting member has a cylindrical portion, and is difficult to employ when a groove-shaped second mounting member or the like is employed. Furthermore, in order to stably obtain the fixing strength by press-fitting, it is necessary to match the dimensions of the cylindrical portion of the second mounting member and the cylindrical portion of the outer bracket with high accuracy, and an allowable range of the dimensional error of the member Was narrow.

JP 2012-2328 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that it can be applied not only to a cylindrical shape but also to a second mounting member such as a groove shape. An object of the present invention is to provide an anti-vibration device having a novel structure in which mounting failure due to a dimensional error of a member is avoided when mounting to the mounting member.

  That is, according to the first aspect of the present invention, the first mounting member and the second mounting member are elastically connected by the main rubber elastic body, and the first mounting member is connected to the vibration transmission system via the inner bracket. And the second mounting member is attached to the other member constituting the vibration transmission system via the outer bracket. The outer bracket includes a first bracket member and a second bracket member, and the first bracket member includes a plurality of support wall portions and a first sandwiching portion protruding inwardly from the support wall portions. And the second bracket member is provided with a second clamping portion facing the first clamping portion, and the second mounting member is connected to the first clamping portion and the second clamping member. With the department The first bracket member and the second bracket member are spaced apart from each other, and one of the first sandwiching portion and the second sandwiching portion contacts the main rubber elastic body. And the outer bracket is attached to the second holding member by interposing rubber between either one of the first holding portion and the second holding portion and the second mounting member. It is characterized by being elastically supported by the mounting member.

  According to the vibration isolator having the structure according to the first aspect as described above, the second mounting of the vibration isolator main body having a structure in which the first mounting member and the second mounting member are connected by the main rubber elastic body. When the member side is sandwiched between and supported by the first clamping portion and the second clamping portion, the second mounting member is a groove shape or the like that opens to the first mounting member side other than the cylindrical shape. The outer bracket can be attached without any problem.

  In addition, the second mounting member is spaced from both the first and second bracket members and is disposed between the first and second clamping portions, and the first clamping portion and the second clamping portion. One of the two is in contact with the main rubber elastic body, and the other is in indirect contact with the second mounting member via the sandwiching rubber. As a result, the outer bracket is attached to the second attachment member via the rubber elastic body without any adverse effect on the dimensional error of the second attachment member and the outer bracket that are both rigid. Thus, stable attachment of the outer bracket to the second attachment member is realized.

  According to a second aspect of the present invention, in the vibration isolator described in the first aspect, a gate-shaped stopper portion is provided on the outer bracket, and the stopper portion straddles the first attachment member. A stopper means configured to limit a relative displacement amount of the first mounting member and the second mounting member by abutting between the first mounting member and the stopper portion; The protruding tip portions of the first sandwiching portion are connected to each other by the stopper portion.

  According to the 2nd aspect, since a stopper means is comprised by the stopper part provided in the outer bracket, a stopper means can be provided with few parts. In addition, since the projecting tip portions of the plurality of first sandwiching portions are connected to each other by the stopper portion, the first sandwiching portions are relatively positioned, and an appropriate contact pressure is applied to the main rubber elastic body. It abuts.

  According to a third aspect of the present invention, in the vibration isolator described in the second aspect, the main rubber elastic body has a long cone trapezoidal shape, and the main rubber elastic body is free in the long axis direction. The length is larger than the free length in the minor axis direction, and the stopper portion is disposed across the first attachment member in the major axis direction of the main rubber elastic body. The relative displacement in the major axis direction of the main rubber elastic body between the mounting member and the second mounting member is limited by the stopper means.

  According to the 3rd aspect, durability improvement is achieved in the major axis direction where a free length is ensured large by making the main body rubber elastic body into the shape of a long cone trapezoid. In addition, since the relative displacement amount in the major axis direction of the first mounting member and the second mounting member is limited by the stopper means, the spring can be softened easily by securing a large free length. In this case, a decrease in durability due to excessive elastic deformation of the main rubber elastic body is prevented.

  According to a fourth aspect of the present invention, in the vibration isolator described in any one of the first to third aspects, the second attachment member includes a cylindrical portion, and the cylindrical portion The main body rubber elastic body having a truncated cone shape is fixed, and the cylindrical portion further extends from the fixing portion of the main rubber elastic body, and the extension side of the second mounting member A fluid chamber in which an incompressible fluid is sealed is defined between the opposing surfaces of the main rubber elastic body and the flexible membrane by closing the opening with a flexible membrane.

  The outer bracket can be easily and reliably attached to the fluid-filled vibration isolator as in the fourth aspect, and the outer bracket structure can be shared. In addition, since the first mounting member and the second mounting member are elastically connected by the main rubber elastic body, the vibration isolator main body having the fluid chamber can be formed separately from the bracket. Yes, it can be easily applied to a fluid-filled vibration isolator.

  According to a fifth aspect of the present invention, in the vibration isolator described in the fourth aspect, an annular fixing member is fixed to the outer peripheral end portion of the flexible film, and the outer peripheral portion of the fixing member is It is fixed to the second mounting member, and the sandwiching rubber formed integrally with the flexible film is fixed to the inner peripheral portion of the fixing member.

  According to the fifth aspect, since the sandwich rubber is integrally formed with the flexible film, the number of parts can be reduced, and the structure can be simplified and the number of manufacturing steps can be reduced.

  According to a sixth aspect of the present invention, in the vibration isolator described in the fifth aspect, the fixing member is an outer periphery in which an inner peripheral portion to which the sandwiching rubber is fixed is fixed to the second mounting member. The stepped shape is located on the other side of the first holding part and the second holding part from the part.

  According to the sixth aspect, the fixing portion of the second mounting member and the fixing member is greatly separated from the sandwiching portion to avoid the hard second mounting member and the fixing member from coming into contact with the outer bracket. As a result, it is possible to more effectively prevent assembly defects due to dimensional errors. Further, the inner peripheral portion to which the sandwiching rubber is fixed in the fixing member is disposed closer to the sandwiching portion than the fixing portion to the second mounting member, so that the outer bracket via the sandwiching rubber is elastic. Thus, the second mounting member and the outer bracket are elastically connected to each other via the main rubber elastic body and the sandwiching rubber.

  According to a seventh aspect of the present invention, in the vibration isolator described in the fifth or sixth aspect, a positioning protrusion that protrudes toward the second bracket member is provided at an inner peripheral end of the fixing member. The positioning projection is inserted into a positioning hole formed in the second bracket member and abutted and locked in the direction perpendicular to the axis, thereby connecting the second mounting member and the second bracket member to each other. Positioning means for positioning is configured.

  According to the seventh aspect, the positioning of the vibration isolator main body and the outer bracket in the direction perpendicular to the axis is realized by using the fixing member. Therefore, in the structure in which the vibration isolator main body and the outer bracket are connected elastically between the first clamping portion and the second clamping portion, the vibration isolator main body and the outer bracket are detached or displaced in the direction perpendicular to the axis. Is prevented by a simple structure with a small number of parts.

  According to an eighth aspect of the present invention, in the vibration isolator described in any one of the first to seventh aspects, a pair of the support wall portions facing each other is provided, and the pair of support walls Each of the support wall portions is provided with the first clamping portion so as to protrude inward in the opposing direction of the portion.

  According to the eighth aspect, since the pair of support wall portions are arranged to face each other, a stable mounting state of the outer bracket with respect to the second mounting member is realized with a small number of support wall portions and the first clamping portion. Simplification of the structure and weight reduction can be achieved.

  According to the present invention, the outer bracket is configured to include the first bracket member provided with the first holding portion and the second bracket member provided with the second holding portion, and the first holding portion and the second holding portion. And a second mounting member spaced apart from the outer bracket, and the first clamping portion and the second clamping portion are in contact with one of the main rubber elastic body and the sandwiching rubber. Yes. Thereby, the outer bracket is elastically attached to the second attachment member via the main rubber elastic body and the sandwich rubber, and the second attachment member is formed by elastic deformation of the main rubber elastic body and the sandwich rubber. Since a dimensional error or the like of the outer bracket or the like is allowed, a mounting failure or rattling is prevented, and a stable mounting state can be realized. Moreover, since it can be attached to other than the cylindrical second attachment member, the outer bracket can be shared.

The perspective view which shows the engine mount as one Embodiment of this invention. The top view of the engine mount shown by FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. VV sectional drawing of FIG. The top view which shows the state which attached the base metal fitting to the mount main body which comprises the engine mount shown by FIG. The longitudinal cross-sectional view which expands and shows the principal part of the engine mount shown by FIG. The longitudinal cross-sectional view which expands and shows another principal part of the engine mount shown by FIG.

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

  1 to 5 show an automobile engine mount 10 as an embodiment of a vibration isolator having a structure according to the present invention. The engine mount 10 has a structure in which an inner bracket 14 and an outer bracket 16 are attached to a mount body 12. The mount body 12 has a structure in which the first attachment member 18 and the second attachment member 20 are elastically connected by a main rubber elastic body 22. In the following description, the vertical direction means the vertical direction in FIG. 3 in principle. Moreover, the front-rear direction means the left-right direction in FIG. 2 which is the vehicle front-rear direction in principle when the engine mount 10 is mounted on the vehicle.

  More specifically, the first mounting member 18 is a high-rigidity member formed of iron, aluminum alloy, or the like, and is disposed below the support member 24 having a substantially rectangular cylindrical shape. And a substantially cup-shaped fixing member 26. The upper end opening of the fixing member 26 is integrally formed with a flange portion projecting to the outer peripheral side. The flange portion is superimposed on the lower surface of the support member 24 and fixed by means such as welding. The support member 24 and the fixing member 26 are fixed to each other.

  The second mounting member 20 has a thin, large-diameter, substantially long cylindrical shape, and is a highly rigid member similar to the first mounting member 18. Further, the lower end portion of the second mounting member 20 is provided with an abutting step 28 that protrudes to the outer peripheral side, and an annular caulking piece 30 that protrudes downward from the outer peripheral end of the abutting step 28. ing. The major axis direction of the second mounting member 20 is the left-right direction in FIG. 2, and the minor axis direction is the vertical direction in FIG. Moreover, in this embodiment, since the whole 2nd attachment member 20 is made into the cylinder shape, the cylindrical part is comprised by the 2nd attachment member 20 whole.

  The first mounting member 18 is disposed in the upper opening of the second mounting member 20, and the first mounting member 18 and the second mounting member 20 are elastically connected by the main rubber elastic body 22. . The main rubber elastic body 22 has a thick, large-diameter, substantially long truncated cone shape, and a fixing member 26 of the first mounting member 18 is vulcanized and bonded to the small-diameter side end portion, and the large-diameter side. The second mounting member 20 is superimposed on the outer peripheral surface of the end portion and vulcanized and bonded. The main rubber elastic body 22 is not only fixed to the outer peripheral surface of the fixing member 26 of the first mounting member 18 but also filled on the inner peripheral side of the fixing member 26. The second mounting member 20 extends downward from the main rubber elastic body 22. The main rubber elastic body 22 has a major axis and a minor axis that coincide with the major axis and the minor axis of the second mounting member 20, and the major axis extends in the left-right direction in FIG. The shaft extends in the vertical direction in FIG. Further, since the fixing member 26 has a substantially circular cup shape having a substantially constant outer diameter along the entire circumference, the free length in the major axis direction of the main rubber elastic body 22 is larger than the free length in the minor axis direction. Has also been enlarged.

  The main rubber elastic body 22 is formed with a large-diameter recess 32 that opens to the end surface on the large-diameter side. The large-diameter recess 32 has a reverse mortar shape or dish shape that is reduced in diameter toward the upper side, and is formed at a depth that does not reach the first mounting member 18. The large-diameter recess 32 of the present embodiment has an oval shape corresponding to the main rubber elastic body 22 when viewed in the axial direction.

  Further, a seal rubber layer 34 is integrally formed on the main rubber elastic body 22. The seal rubber layer 34 is a thin-walled cylindrical rubber elastic body projecting downward from the outer peripheral side of the large-diameter recess 32, and is a second attachment that extends downward from the fixing portion of the main rubber elastic body 22. The member 20 is deposited on the lower inner peripheral surface of the member 20.

  The main rubber elastic body 22 is integrally formed with a buffer rubber 36 that covers the outer peripheral surface of the support member 24 of the first mounting member 18. The buffer rubber 36 is fixed so as to cover the upper wall portion and the pair of side wall portions of the support member 24, and in particular, the portion fixed to the upper wall portion is formed with a plurality of concave grooves opened on the upper surface. In the longitudinal section, it has a wavy shape.

  Further, a support rubber layer 38 is formed on the inner peripheral surface of the support member 24 having a substantially rectangular tube shape. The support rubber layer 38 is integrally formed with the main rubber elastic body 22 and covers the entire inner peripheral surface of the support member 24, and a large number of irregularities are continuously adjacent in the circumferential direction of the support member 24. It has a wavy inner peripheral surface.

  Furthermore, a stopper rubber 40 is integrally formed at the end of the main rubber elastic body 22 on the small diameter side. The stopper rubber 40 is a substantially rectangular rubber elastic body, and extends to one side of the main rubber elastic body 22 in the minor axis direction as shown in FIGS.

  The flexible film 42 is attached to the second mounting member 20 vulcanized and bonded to the main rubber elastic body 22 as described above at a portion protruding downward from the main rubber elastic body 22. The flexible membrane 42 is a rubber membrane having a thin, substantially oval dome shape, and has sufficient slackness. An annular fixing portion 44 is integrally formed at the outer peripheral end of the flexible film 42, and the fixing portion 44 is fixed to the fixing member 46.

  The fixing member 46 is a hard member having a substantially oval shape, and has a substantially oval plate-like fixing portion 48 and an annular positioning protrusion 50 protruding downward from the inner peripheral end of the fixing portion 48. And are integrated. The fixing portion 48 includes a stepped portion 52 at a radially intermediate portion, the outer peripheral side of the stepped portion 52 is a caulking portion 54, and the inner peripheral side of the stepped portion 52 is positioned below the caulking portion 54. The fixing portion 48 has a stepped, generally oval annular plate shape as a whole.

  The fixing portion 44 is vulcanized and bonded to the positioning protrusion 50 of the fixing member 46, so that the flexible film 42 is formed as an integrally vulcanized molded product including the fixing member 46. Further, a seal rubber 58 formed integrally with the fixing portion 44 is fixed to the upper surface of the support portion 56, and a sandwich rubber 60 formed integrally with the fixing portion 44 is fixed to the lower surface of the support portion 56. Thereby, the inner peripheral side rather than the level | step-difference part 52 in the fixing member 46 is covered with the rubber elastic body over the whole.

  The flexible membrane 42 is supported by the second mounting member 20 by the caulking portion 54 of the fixing member 46 being caulked and fixed by the caulking piece 30 of the second mounting member 20. As a result, the lower opening of the second mounting member 20 is closed by the flexible membrane 42, and an incompressible fluid is passed between the axially opposing surfaces of the main rubber elastic body 22 and the flexible membrane 42. An enclosed fluid chamber 62 is formed. The incompressible fluid sealed in the fluid chamber 62 is not particularly limited. For example, water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof is preferably employed. The Further, in order to efficiently obtain a vibration isolation effect based on the fluid flow action described later, a low viscosity fluid of 0.1 Pa · s or less is desirable.

  A partition member 64 is accommodated in the fluid chamber 62. The partition member 64 is formed of a metal or a hard synthetic resin, and has a thick, substantially oval shape as a whole. The partition member 64 includes a partition member main body 66 and a lid member 68.

  The partition member main body 66 has a thick and substantially oblong disk shape, and a housing recess 70 that opens upward and a wall recess 72 that opens downward are formed in the central portion in the radial direction. The central portion in the radial direction is thinner than the outer peripheral portion. Furthermore, a lower through-hole 74 penetrating in the vertical axis direction with an oval cross section is formed in the radially central portion of the thin wall. In addition, a circumferential groove 76 is formed in the outer peripheral portion of the partition member main body 66 so as to open in the outer peripheral surface and extend in a circumferential spiral shape with a predetermined length of less than two rounds.

  The lid member 68 has a thin, substantially oval shape, and an upper through-hole 78 extending in the axial direction with a substantially constant oval cross section is formed through the central portion in the radial direction. The lid member 68 is superimposed on the upper surface of the partition member main body 66, and the inner peripheral end of the lid member 68 protrudes above the opening of the housing recess 70.

  A movable film 80 is disposed between the partition member main body 66 and the lid member 68. The movable film 80 is a substantially oval-shaped rubber elastic body, and an annular thick portion 82 projecting on both sides in the thickness direction is integrally formed at the outer peripheral end portion. The movable film 80 is inserted into the housing recess 70 in a state where the outer peripheral end portion is supported by the thick portion 82 being sandwiched between the bottom surface of the housing recess 70 and the inner peripheral end portion of the lid member 68. It is arranged. The radial central portion of the movable film 80 is allowed to be deformed in the thickness direction by the upper and lower through holes 78 and 74.

  The partition member 64 having such a structure is accommodated and disposed so as to spread in the direction perpendicular to the axis with respect to the fluid chamber 62, and the outer peripheral end portion is formed between the large-diameter side end surface of the main rubber elastic body 22 and the fixing member 46. The outer peripheral surface is pressed against the second mounting member 20 via the seal rubber layer 34 and is supported by the second mounting member 20. As a result, the fluid chamber 62 is divided into two parts up and down across the partition member 64. Above the partition member 64, a part of the wall portion is composed of the main rubber elastic body 22, and fluctuations in internal pressure occur during vibration input. An induced pressure receiving chamber 84 is formed, and below the partition member 64, a part of the wall portion is formed of the flexible film 42, and an equilibrium chamber 86 in which volume change is easily allowed is formed. Has been.

  Further, the circumferential groove 76 formed in the partition member 64 has a tunnel-like flow path whose circumferential opening is fluid-tightly closed by the second mounting member 20 via the seal rubber layer 34. Is formed. One end portion of the tunnel-shaped flow path communicates with the pressure receiving chamber 84 through the upper communication hole 87, and the other end portion communicates with the equilibrium chamber 86 through the lower communication hole (not shown). An orifice passage 88 is formed by utilizing the circumferential groove 76 so as to communicate the 84 and the equilibrium chamber 86 with each other. The orifice passage 88 is a resonance frequency of the flowing fluid by adjusting the ratio (A / L) of the passage cross-sectional area (A) and the passage length (L) while considering the wall spring rigidity of the fluid chamber 62. The tuning frequency is set to a low frequency of about 10 Hz corresponding to engine shake. When low-frequency large-amplitude vibration is input in a state where the engine mount 10 to be described later is mounted on the vehicle, the fluid flows between the pressure receiving chamber 84 and the equilibrium chamber 86 through the orifice passage 88, and the resonance action of the fluid Based on the fluid action such as the above, the intended vibration isolation effect is exhibited.

  Further, the movable film 80 is provided with the hydraulic pressure of the pressure receiving chamber 84 through the upper through-hole 78 on the upper surface thereof, and with the hydraulic pressure of the equilibrium chamber 86 through the lower through-hole 74 with respect to the lower surface. ing. Accordingly, when a relative pressure difference is generated between the pressure receiving chamber 84 and the equilibrium chamber 86, the movable film 80 is elastically deformed in the thickness direction so that the hydraulic pressure in the pressure receiving chamber 84 is transmitted to the equilibrium chamber 86. It has become. Thus, in the engine mount 10 of the present embodiment, a hydraulic pressure transmission mechanism that uses elastic deformation of the movable film 80 is configured.

  An inner bracket 14 and an outer bracket 16 are attached to the mount body 12 having such a structure. The inner bracket 14 is a high-rigidity member formed of metal or the like, and extends in the left-right direction and is inserted into the support member 24 of the first mounting member 18. An attachment portion 92 that protrudes in the front-rear direction at the tip portion of the portion 90 and is fixed to a power unit (not shown) is integrally provided. The mounting portion 92 is formed with a plurality of bolt holes 94 penetrating vertically, and one of the bolt holes 94 protrudes upward and constitutes a bolt or nut seat. The part 96 is penetrated.

  The inner bracket 14 is fixed to the first mounting member 18 by inserting the connecting portion 90 into the support member 24 of the first mounting member 18 and fitting it. In the present embodiment, the insertion portion of the connecting portion 90 to the support member 24 has a corrugated surface shape and is locked to the support rubber layer 38 fixed to the inner peripheral surface of the support member 24. Thus, the amount of insertion of the connecting portion 90 into the support member 24 is defined, and misalignment is prevented.

  The outer bracket 16 includes a gate metal 98 as a first bracket member and a base metal 100 as a second bracket member.

  The gate metal 98 includes a pair of opposing wall portions 102 and 102 as support wall portions that oppose each other in the front-rear direction. The opposing wall portion 102 has a plate shape extending in the vertical direction, and has a tapered shape that gradually inclines outward in the opposing direction as the lower portion goes downward.

  Further, the attachment plate portion 104 protrudes outward in the opposing direction from the lower end portions of the pair of opposing wall portions 102, 102. The mounting plate portion 104 has a substantially rectangular plate shape extending in a direction perpendicular to the axis, and a bolt hole 106 penetrating in the thickness direction is formed.

  Moreover, the 1st clamping part 108 is provided in the upper end part of a pair of opposing wall part 102,102, respectively. The first clamping part 108 is formed so as to protrude inward in the opposing direction of the pair of opposing wall parts 102, 102 from the upper end part of the pair of opposing wall parts 102, 102. The upper end portion of the opposing wall portion 102 is bent inward in the opposing direction, so that the first sandwiching portion 108 is integrally formed with the opposing wall portion 102.

  Further, a gate-shaped stopper portion 110 is provided above the pair of first sandwiching portions 108 and 108. The stopper portion 110 has a pair of leg wall portions 112 and 112 that are formed in a plate shape extending vertically and opposed to each other in the front-rear direction, and a plate shape that extends in a direction perpendicular to the axis and is the upper end of the pair of leg wall portions 112 and 112. The top plate part 114 which connects a part mutually is provided integrally. Further, a plate-like mounting bracket 116 protruding rightward (rightward in FIG. 4) is fixed to the lower ends of the pair of leg wall portions 112, 112 by means of welding or the like. A bolt hole 118 is formed through the front end portion.

  And a pair of leg wall parts 112 and 112 are integrally formed with respect to the protrusion front-end | tip part of a pair of 1st clamping part 108,108, and protrudes upwards, These 1st clamping part 108,108 is a stopper part. 110 are interconnected by 110. In addition, the boundary part of the 1st clamping part 108 and the leg wall part 112 is made into the curved shape in the longitudinal cross-section, and has a smooth surface, without making a corner | angular part (folding point).

  The gate metal 98 is integrally formed with reinforcing ribs 120 protruding outward in the thickness direction at both ends in the width direction (up and down in FIG. 2). Further, the mounting bracket 116 includes a pair of integrally formed reinforcing ribs 122, 122, and has a groove shape extending in the protruding direction as a whole. By forming these reinforcing ribs 120 and 122, the rigidity of the gate fitting 98 made of a plate material is improved.

  On the other hand, the base metal fitting 100 is integrally provided with a plate-like bottom plate portion 124 that extends in a direction perpendicular to the axis and a stopper plate portion 126 that protrudes upward from the left end portion (left end in FIG. 4) of the bottom plate portion 124. .

  As shown in FIGS. 3 and 6, the bottom plate portion 124 is formed in a plate shape extending in the front-rear direction, and widens in the left-right direction at the center portion in the front-rear direction. Further, bolt holes 128 penetrating in the thickness direction are formed at both ends of the bottom plate portion 124 in the front-rear direction. Further, a positioning hole 130 is formed in the center portion of the bottom plate portion 124 in the front-rear direction and penetrates in the thickness direction with a substantially oval cross section. And the opening peripheral part of the positioning hole 130 in the baseplate part 124 is made into the 2nd clamping part 132. FIG.

  4 and 6, the stopper plate portion 126 is integrally formed at the left end of the bottom plate portion 124 and protrudes upward, and the upper end portion of the stopper plate portion 126 is bent and protrudes to the left. Part 134.

  Then, the gate fitting 98 and the base fitting 100 are overlapped vertically with the mounting plate portion 104 of the gate fitting 98 and the bottom plate portion 124 of the base fitting 100, and temporarily fixed to each other by means such as welding. A bracket 16 is configured. Further, in the outer bracket 16, the first holding portions 108 and 108 of the gate fitting 98 and the second holding portion 132 of the base fitting 100 face each other with a predetermined distance therebetween.

  The outer bracket 16 having such a structure is attached to the second attachment member 20 side of the mount body 12. More specifically, as shown in FIG. 7, the protruding distal end portion of the first clamping portion 108 of the gate fitting 98 has the second mounting member 20 with respect to the outer peripheral surface (side surface) of the main rubber elastic body 22. As shown in FIG. 8, the second holding portion 132 of the base metal fitting 100 is held between the fixing member 46 supported by the second mounting member 20. The rubber layers 60 are overlapped with each other. Accordingly, the second attachment member 20 side of the mount body 12 is supported by being sandwiched up and down between the first clamping unit 108 and the second clamping unit 132.

  Further, the second mounting member 20 disposed between the opposing surfaces of the first sandwiching portion 108 and the second sandwiching portion 132 has a gap 136 in the vertical direction with respect to both the first and second sandwiching portions 108 and 132. , 138 and spaced apart with a gap 140 on the inner peripheral side with respect to the opposing wall portion 102. As a result, the outer bracket 16 is in direct contact with the second mounting member 20 through the main rubber elastic body 22 and the sandwiching rubber 60 without directly contacting the second mounting member 20. It is elastically attached to the second attachment member 20.

  In this way, the outer bracket 16 is attached to the second mounting member 20 without causing the main rubber elastic body 22 and the sandwiching rubber 60 to move without directly contacting the second mounting member 20 and the outer bracket 16. It is realized by making it contact indirectly via. As a result, the outer bracket 16 is elastically attached to the second attachment member 20, and errors in the dimensions of the second attachment member 20 and the outer bracket 16 are caused by the main rubber elastic body 22 and the sandwiched parts. Allowed by elastic deformation of the rubber 60. Therefore, it is possible to prevent problems such as the outer bracket 16 being not attached to the second attachment member 20 due to a dimensional error or the occurrence of rattling after the attachment, and the outer bracket 16 with respect to the second attachment member 20. A stable wearing state is realized.

  In the present embodiment, the frame-shaped outer bracket 16 is attached to the cylindrical second attachment member 20. The outer bracket 16 is directly fixed to the second attachment member. Therefore, it can be attached to the second attachment member having a shape other than the cylindrical shape. As described above, the outer bracket 16 can be attached to the second attachment members having various shapes, and the common use of the outer bracket 16 can be realized between the vibration isolator main bodies having different structures.

  In the present embodiment, since the pair of first clamping portions 108 and 108 are provided at positions facing each other in one radial direction of the mount main body 12, the mounting is performed with a small number of first and second clamping portions 108 and 132. Stable attachment of the outer bracket 16 to the main body 12 is realized.

  Furthermore, the stopper part 110 is provided so that between the protrusion front-end | tips of a pair of 1st clamping parts 108 and 108 may be connected. Therefore, the pair of first sandwiching portions 108 and 108 are relatively positioned, the contact position and the contact amount with respect to the main rubber elastic body 22 are appropriately set, and the outer of the second mounting member 20 is set. Contact with the bracket 16 is avoided.

  In addition, since the main rubber elastic body 22 has a substantially oval shape when viewed in the vertical axis direction, a large free length is ensured in the long axis direction to improve durability, and in the short axis direction, Miniaturization can be achieved, and a necessary arrangement space can be reduced.

  In addition, the pair of first sandwiching portions 108 and 108 are provided so as to face each other in the major axis direction of the main rubber elastic body 22, and the stoppers are connected so as to connect the protruding tips of the pair of first sandwiching portions 108 and 108. A section 110 is provided. Thereby, the relative displacement amount in the major axis direction of the first mounting member 18 and the second mounting member 20 is limited, and the elastic deformation amount is limited in the major axis direction of the main rubber elastic body 22 having a large free length. As a result, durability can be improved.

  The mount body 12 is a fluid-filled vibration isolator, and the fluid filling into the fluid chamber 62 is completed before the brackets 14 and 16 are attached. Thus, in the engine mount 10, since the mount body 12 is independent of the brackets 14 and 16, the assembly of the mount body 12 is performed, for example, in a water tank filled with the sealed fluid, for example, a fluid-filled mount After the main body 12 is formed, the engine mount 10 with the brackets 14 and 16 can be easily obtained by retrofitting the brackets 14 and 16 to the mount main body 12.

  Further, a sandwiching rubber 60 interposed between the mount body 12 and the outer bracket 16 is integrally formed with the flexible film 42 constituting the fluid-filled mount body 12 and fixed to the fixing member 46. Yes. Thereby, elastic mounting of the outer bracket 16 to the mount body 12 is realized with a simple structure having a small number of parts. Since the fixing member 46 is caulked and fixed to the second mounting member 20, the sandwiching rubber 60 is substantially interposed between the second mounting member 20 and the second clamping portion 132. Yes.

  Furthermore, the fixing member 46 has a stepped plate shape, and the inner peripheral portion (supporting portion 56) to which the sandwiching rubber 60 is fixed is the outer peripheral portion (fixing portion 48) fixed to the second mounting member 20. ) Below the second pinching portion 132 and positioned closer to the second pinching portion 132. As a result, the second sandwiching portion 132 is stably brought into contact with the sandwiching rubber 60, and the fixing portion between the second mounting member 20 and the fixing member 46 is disposed away from the bottom plate portion 124. Therefore, it is possible to tolerate a dimensional error of parts more advantageously.

  Further, the positioning protrusion 50 formed integrally with the inner peripheral end of the fixing member 46 is inserted into the positioning hole 130 penetratingly formed in the bottom plate portion 124, and is perpendicular to the inner peripheral surface of the positioning hole 130. Thus, positioning means for relatively positioning the mount main body 12 and the outer bracket 16 in the direction perpendicular to the axis is configured. Thereby, the positioning means is realized with a small number of parts and a simple structure without requiring special parts. In addition, in this embodiment, since the positioning protrusion 50 is covered with the fixing portion 44 integrally formed with the flexible film 42, a rubber elastic body (fixing portion) is provided between the positioning protrusion 50 and the positioning hole 130. 44), the dimensional error is absorbed by the elastic deformation of the fixing portion 44, and problems such as difficulty in insertion due to the dimensional error and generation of noise due to a gap after insertion are avoided.

  Further, the abutting portion 134 of the outer bracket 16 is disposed so as to face the inner bracket 14 at a predetermined distance in the vertical direction. And the bound stopper means for limiting the relative displacement amount of the first mounting member 18 and the second mounting member 20 in the axial approach side by the contact between the lower surface of the inner bracket 14 and the upper surface of the contact portion 134. It is configured. A stopper rubber 40 of the mount body 12 is disposed between the opposing surfaces of the inner bracket 14 and the abutting portion 134, and the inner bracket 14 and the abutting portion 134 abut via the stopper rubber 40, The adverse effects on the ride comfort caused by the impact at the time of contact and the generation of contact sound are avoided.

  Further, the stopper portion 110 is disposed across the first attachment member 18 in the front-rear direction, which is the major axis direction of the main rubber elastic body 22, and the top plate portion 114 extends forward and backward over the first attachment member 18. It extends in the direction. The relative displacement amount of the first mounting member 18 and the second mounting member 20 toward the axially separated side due to the contact between the upper surface of the support member 24 of the first mounting member 18 and the lower surface of the top plate portion 114. Rebound stopper means for limiting the above is configured. A buffer rubber 36 is disposed between the opposing surfaces of the support member 24 and the top plate portion 114, and the support member 24 and the top plate portion 114 are in contact with each other via the buffer rubber 36, so The impact is alleviated and the occurrence of hitting sounds is prevented. In particular, a portion of the buffer rubber 36 fixed to the upper surface of the support member 24 is formed with a plurality of concave grooves that are open on the upper surface, thereby reducing the initial contact area, thereby improving the buffer function. It has been.

  Furthermore, the pair of leg wall portions 112, 112 of the stopper portion 110 are disposed so as to face the support member 24 of the first mounting member 18 outward in the front-rear direction, which is the major axis direction of the main rubber elastic body 22. ing. The front / rear stopper means for limiting the amount of relative displacement in the front / rear direction of the first mounting member 18 and the second mounting member 20 is configured by the contact between the support member 24 and the leg wall portion 112. A cushioning rubber 36 is disposed between the opposing surfaces of the support member 24 and the leg wall 112, and the support member 24 and the leg wall 112 are brought into contact with each other via the cushioning rubber 36. Prevention of the hitting sound due to buffering is realized.

  In the engine mount 10 including the inner bracket 14 and the outer bracket 16, the inner bracket 14 is bolted to a power unit (not shown), and the outer bracket 16 is bolted to a vehicle body (not shown). Anti-vibration connection to the body. Further, the outer bracket 16 is attached to the vehicle body by bolts (not shown) inserted through the bolt holes 106, 118, and 128, so that the gate fitting 98 and the base fitting 100 are fixed to each other. Furthermore, in the mounted state on the vehicle, since the shared support load of the power unit is input between the first mounting member 18 and the second mounting member 20, a predetermined amount is provided between the buffer rubber 36 and the top plate portion 114. Gap (stopper clearance) is secured.

  Further, in the present embodiment, when the support load shared by the engine mount 10 of the power unit is input in the mounting state on the vehicle, the main rubber elastic body 22 is compressed and deformed in the axial direction and bulges to the outer peripheral side. It is designed to be deformed. Thereby, the contact state of the first clamping portion 108 with respect to the main rubber elastic body 22 is maintained, and the elastic attachment of the outer bracket 16 to the second attachment member 20 side is stably realized even in the vehicle mounted state. It has come to be.

  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 fluid-filled mount body 12 is shown as the vibration-proof device body to which the bracket is attached. However, the vibration-proof device body is not necessarily limited to the fluid-filled type, and the fluid chamber 62 A solid type anti-vibration device main body without any of them can also be adopted.

  Furthermore, the second attachment member is not limited to a cylindrical one, and for example, a groove-like second attachment member that opens upward may be employed. In particular, when a solid-type vibration isolator main body having no fluid chamber 62 is employed, the second mounting member having various structures can be employed.

  Further, in the embodiment, the pair of opposing wall portions 102 and 102 that are opposed to the gate metal 98 of the outer bracket 16 in one radial direction are provided, and the first clamping portion 108 is provided on each of the opposing wall portions 102 and 102. Although the structure in which is formed is illustrated, three or more support wall portions may be formed, and the first clamping portions may be formed on the support wall portions, respectively. In short, it is sufficient that a plurality of support wall portions and first clamping portions are provided.

  Further, the vibration isolator according to the present invention is not limited to that used as an engine mount, and may be used for a body mount, a subframe mount, a differential mount, and the like. Furthermore, the application range of the present invention is not limited to automobiles, but can be applied to those used for motorcycles, railway vehicles, industrial vehicles, and the like.

10: engine mount (vibration isolation device), 14: inner bracket, 16: outer bracket, 18: first mounting member, 20: second mounting member, 22: main rubber elastic body, 42: flexible membrane, 46: fixing member, 50: positioning protrusion, 60: clamping rubber, 62: fluid chamber, 98: gate fitting (first bracket member), 100: base fitting (second bracket member), 102: facing wall ( Support wall part), 108: first clamping part, 110: stopper part, 132: second clamping part

Claims (8)

The first attachment member and the second attachment member are elastically connected by the main rubber elastic body, and the first attachment member is attached to one member constituting the vibration transmission system via the inner bracket. And the second mounting member is attached to the other member constituting the vibration transmission system via the outer bracket.
The outer bracket includes a first bracket member and a second bracket member, and the first bracket member includes a plurality of support wall portions and a first sandwiching portion protruding inwardly from the support wall portions. And the second bracket member is provided with a second clamping part that faces the first clamping part, and the second mounting member is provided with the first clamping part and the second clamping part. Between the first bracket member and the second bracket member, and either one of the first clamping portion and the second clamping portion is the main rubber elastic body. And the sandwiched rubber is interposed between the other one of the first clamping part and the second clamping part and the second mounting member, so that the outer bracket is A vibration isolator which is elastically supported by two mounting members.   The outer bracket is provided with a portal-shaped stopper portion that interconnects the protruding tip portions of the plurality of first clamping portions, and the stopper portion is disposed across the first mounting member, The anti-vibration device according to claim 1, wherein stopper means for limiting a relative displacement amount between the first mounting member and the second mounting member is configured by contact between the first mounting member and the stopper portion. apparatus.   The main rubber elastic body is in the shape of a long cone trapezoid, the free length in the major axis direction of the main rubber elastic body is larger than the free length in the minor axis direction, and the stopper portion is The first mounting member is disposed across the major axis direction of the main rubber elastic body, and the first mounting member and the second mounting member are relative to each other in the major axis direction of the main rubber elastic body. The vibration isolator according to claim 2, wherein a displacement amount is limited by the stopper means.   The second mounting member includes a cylindrical portion, and the main rubber elastic body having a truncated cone shape is fixed to the cylindrical portion, and the cylindrical portion is the main rubber elastic body. And the opening on the extension side of the second mounting member is closed with a flexible film, so that the gap between the opposing surfaces of the main rubber elastic body and the flexible film is The vibration isolator according to any one of claims 1 to 3, wherein a fluid chamber in which an incompressible fluid is sealed is defined.   An annular fixing member is fixed to the outer peripheral end of the flexible membrane, and the outer peripheral portion of the fixing member is fixed to the second mounting member, and the inner peripheral portion of the fixing member is The vibration isolator according to claim 4, wherein the sandwich rubber integrally formed with the flexible film is fixed.   In the fixing member, an inner peripheral portion to which the sandwiching rubber is fixed is positioned on the other side of the first sandwiching portion and the second sandwiching portion with respect to an outer peripheral portion fixed to the second mounting member. The vibration isolator according to claim 5, wherein the vibration isolator has a stepped shape.   A positioning projection that protrudes toward the second bracket member is provided at an inner peripheral end of the fixing member, and the positioning projection is inserted into a positioning hole formed in the second bracket member so as to be perpendicular to the axis. The vibration isolator according to claim 5 or 6, wherein positioning means for positioning the second mounting member and the second bracket member relative to each other by being abutted and locked in a direction.   A pair of the supporting wall portions facing each other is provided, and the first clamping portion is provided on each of the supporting wall portions so as to protrude inwardly in the opposing direction of the pair of supporting wall portions. Item 8. The vibration isolator according to any one of items 1 to 7.

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