JP2012002328A - Vibration control device - Google Patents

Abstract

[PROBLEMS] To prevent a flash of a stopper rubber from being bitten by a fastening surface of a first mounting member and an inner bracket and to prevent a stopper rubber from being displaced from being mounted. To provide a vibration device.
A positioning protrusion 96 is formed on the first mounting member 12 so as to protrude on the outer peripheral surface toward the tip end side of the inner bracket 56 at a position with a predetermined distance inward from the outer end surface 23. The protruding front end surface of the positioning protrusion 96 is opposed to the inner peripheral surface of the opening window 94 of the stopper rubber 80.
[Selection] Figure 1

Description

  The present invention relates to a vibration isolator suitably used for an engine mount for automobiles.

  2. Description of the Related Art Conventionally, a vibration isolator that is interposed between members constituting a vibration transmission system and that anti-vibrates and connects these members is known, and is applied to an engine mount for an automobile. This vibration isolator has a structure in which a first attachment member attached to one of the vibration isolation connection target members and a second attachment member attached to the other of the vibration isolation connection target members are connected by a main rubber elastic body. Have.

  By the way, in some vibration isolators, an inner bracket is attached to a first attachment member, and the inner bracket is attached to an anti-vibration connection target member. Further, there is a structure in which a stopper mechanism in a bound direction and a rebound direction is configured by mounting a bag-like stopper rubber on the inner bracket. For example, what is described in Japanese Patent Application Laid-Open No. 2006-97741 (Patent Document 1) is that the first mounting member and the inner bracket are connected through a window provided in the stopper rubber. Stopper rubber is attached without bonding.

  However, in the structure described in Patent Document 1, there is a possibility that the flash formed on the opening peripheral edge portion of the window portion of the stopper rubber may be caught between the overlapping surfaces of the first mounting member and the inner bracket. There was a possibility of causing problems such as loosening. In order to prevent the biting of the flash, if the stopper rubber is separated from the fastening surface of the first mounting member and the inner bracket to the outer peripheral side, the stopper rubber is caused by contact between the stopper rubber and the outer peripheral surface of the first mounting member. The positioning function is insufficient, and the durability of the stopper rubber is lowered due to the displacement and the buffering property of the stopper mechanism is lowered.

Japanese Patent Laid-Open No. 2006-97741

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that the flash of the stopper rubber can be prevented from being caught in the fastening surface of the first mounting member and the inner bracket. An object of the present invention is to provide a vibration isolator having a novel structure capable of preventing the mounting position of the stopper rubber from shifting.

  In the first aspect of the present invention, the first mounting member and the second mounting member are connected by a main rubber elastic body, and the base end side of the inner bracket is superimposed on the outer end surface of the first mounting member. The bolt is fixed and extends to the side, and a mounting portion to the power unit is provided on the tip side that extends to the side of the inner bracket, while the second mounting member has the inner bracket And a rebound stopper is formed at the facing portion between the inner bracket and the gate-shaped member, and a bound stopper mechanism is formed at the facing portion between the inner bracket and the second mounting member. Further, the inner bracket is covered with a bag-like stopper rubber from the base end side and is attached non-adheringly. The first mounting member is overlapped with the inner bracket and fixed with bolts through an opening window formed in the stopper rubber and disposed between the opposing surfaces of the upper mechanism and the rebound stopper mechanism. In the vibration isolator, the first mounting member is formed with a positioning protrusion that protrudes on the outer peripheral surface toward the distal end side of the inner bracket at a position with a predetermined distance inward from the outer end surface. The protruding tip surface of the positioning protrusion is positioned opposite to the inner peripheral surface of the opening window of the stopper rubber.

  According to the first aspect of the present invention, the overlapping portion of the first mounting member and the inner bracket is set sufficiently away from the inner peripheral surface of the opening window in the stopper rubber toward the inner peripheral side, The positioning protrusion provided on the member can be made sufficiently close to the inner peripheral surface of the opening window. Therefore, it is possible to avoid the stopper rubber from being caught between the first mounting member and the inner bracket, and at the same time, the displacement of the stopper rubber is quickly regulated by the contact with the positioning protrusion, and the stopper The rubber can be prevented from being displaced. Accordingly, the fastening force by the bolts of the first mounting member and the inner bracket can be sufficiently increased, and the durability can be improved by preventing partial wear of the stopper rubber, and the stopper rubber is given to the stopper mechanism. The buffer performance is stabilized.

  In particular, since the stopper rubber is prevented from coming off by direct contact with the positioning protrusion, a conventional retaining mechanism that uses the engaging action of unevenness provided between the overlapping surfaces of the inner bracket and the stopper rubber. Compared to the above, a stable positioning effect can be obtained. In the conventional retaining mechanism, the stopper rubber is elastically deformed when an external force is applied, which may cause the locking projection to come out of the locking groove, making it difficult to prevent misalignment. According to this, the direct displacement control by contact makes it possible to effectively exert a retaining action even when an external force is applied.

  In addition, since the prevention of the biting of the flash and the positioning of the stopper rubber are realized by providing a positioning projection on the first mounting member side, the inner mounting side is connected to the first mounting member. No special structure is required, such as protruding the fastening surface. Therefore, a conventional inner bracket can be used, and excellent versatility is exhibited.

  According to a second aspect of the present invention, in the vibration isolator described in the first aspect, an inner peripheral surface of the opening window of the stopper rubber and a protruding front end surface of the positioning protrusion of the first mounting member Are the corresponding shapes that touch each other.

  According to the second aspect, since the inner peripheral surface of the opening window of the stopper rubber and the positioning projection of the first mounting member are in contact with each other, partial wear of the stopper rubber is avoided. At the same time, the stopper rubber is prevented from being damaged by the concentrated contact load. In addition, since the stopper rubber is prevented from being displaced by contact with the positioning protrusion, the positioning protrusion and the stopper rubber come into contact with each other stably. Therefore, local damage to the stopper rubber is prevented, and durability is improved.

  According to a third aspect of the present invention, in the vibration isolator described in the first or second aspect, the outer peripheral surface of the first mounting member is positioned at a position with a predetermined distance inward from the outer end. An annular protrusion that extends in the circumferential direction on the outer periphery of the first mounting member is formed by a step extending in the circumferential direction, and the positioning protrusion is configured by the annular protrusion.

  According to the third aspect, for example, the positioning protrusion is configured by an annular protrusion, and thus, by appropriately setting the shape of the annular protrusion, in the manufacturing process of the vibration isolator body, the first Positioning of the mounting member in the circumferential direction is unnecessary or easy.

  According to a fourth aspect of the present invention, in the vibration isolator described in any one of the first to third aspects, the stopper rubber is overlapped with an end face and both side faces of the base end side of the inner bracket. While three peripheral walls are provided, an upper wall provided so as to cover an upper opening of the three peripheral walls is overlapped with a surface of the inner bracket facing the portal member. The lower openings of the three peripheral wall portions are open toward the first mounting member, and the stopper rubber is attached to the inner mounting bracket in the mounting direction of the stopper rubber to the first mounting member. A lower wall portion that is located behind the overlapping portion and covers the lower opening, and protrudes downward from the overlapping surface of the inner bracket on the first mounting member. The first mounting part of the part The end surface of the side is one that is an inner peripheral surface of the opening window opposite position to the projecting distal end face of the positioning protrusion.

  According to the 4th aspect, generation | occurrence | production of a burr | flash can be prevented effectively in a three-way surrounding wall part. Therefore, the peripheral wall portions of these three sides can be overlapped with the end face and the both side faces of the inner bracket without causing the biting of the flash, and the stopper rubber can be positioned with respect to the inner bracket. it can.

  According to the present invention, since the positioning protrusion is provided on the first mounting member, the flash of the stopper rubber is prevented from being caught between the overlapping portions of the first mounting member and the inner bracket. A sufficient holding force of the mounting member and the inner bracket can be obtained, and a relative displacement of the stopper rubber with respect to the inner bracket can be prevented to avoid local damage of the stopper rubber.

It is a longitudinal cross-sectional view which shows the engine mount as one Embodiment of this invention, Comprising: The figure equivalent to the II cross section of FIG. It is another longitudinal cross-sectional view of the engine mount shown by FIG. 1, Comprising: The figure corresponded in the II-II cross section of FIG. The front view of the engine mount shown by FIG. The left view of the engine mount shown by FIG. The top view of the engine mount shown by FIG. It is a longitudinal cross-sectional view of the mount main body which comprises the engine mount shown by FIG. 1, Comprising: The figure corresponded in the VI-VI cross section of FIG. The top view of the mount main body shown by FIG. The perspective view of the stopper rubber which comprises the engine mount shown by FIG. The perspective view which showed the stopper rubber shown by FIG. 8 from another direction. The right view of the stopper rubber | gum shown by FIG. The bottom view of the stopper rubber | gum shown by FIG. XII-XII sectional drawing of FIG. The longitudinal cross-sectional view which expanded and showed the 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 a first embodiment of a vibration isolator having a structure according to the present invention. The engine mount 10 has a mount body 11, and the mount body 11 has a structure in which a first mounting member 12 and a second mounting member 14 are connected by a main rubber elastic body 16. The first attachment member 12 is attached to a power unit (not shown), and the second attachment member 14 is attached to a vehicle body (not shown), so that the power unit is supported by the vehicle body in a vibration-proof manner. . In the following description, the vertical direction means the vertical direction in FIG. 1, which is the elastic main axis of the engine mount 10 and is also the main vibration input direction in principle. 1 to 5 show an engine mount 10 in a single state before being mounted on a vehicle, and a power unit between the first mounting member 12 and the second mounting member 14 is shown. The support load is not input.

  More specifically, the first mounting member 12 is a highly rigid member having a substantially circular block shape, and is formed of a metal material such as iron or an aluminum alloy. A screw hole 18 extending in the vertical direction and opening in the upper end surface is formed at the radial center of the first mounting member 12, and a thread is formed on the inner peripheral surface thereof. Further, the first mounting member 12 is integrally formed with a protrusion 20 protruding upward. This protrusion 20 is a substantially columnar protrusion provided in a radially intermediate portion that deviates from the central axis toward the outer peripheral side, and is provided at one location on the periphery in this embodiment.

  Further, a flange portion 22 is integrally formed at the upper end portion of the first mounting member 12. The flange portion 22 is continuously formed over the entire circumference of the first mounting member 12 and has an annular shape, and protrudes from the outer peripheral surface of the first mounting member 12 toward the outer peripheral side. Note that the upper end surface of the first mounting member 12 including the upper end surface of the flange portion 22 is a flat outer end surface 23 extending in the direction perpendicular to the axis, and the direction of the center axis of the engine mount 10 (the elastic main shaft of the engine mount 10). The end surface on the outer side in the axial direction of the first mounting member 12 in the extending direction) is formed by the outer end surface 23.

  On the other hand, the second mounting member 14 has a thin-walled, large-diameter, generally cylindrical shape, and has high rigidity like the first mounting member 12. Further, the second mounting member 14 has a large-diameter portion 24 on the upper side of the step in the axial intermediate portion and a small-diameter portion 26 on the lower side of the step.

  The first mounting member 12 and the second mounting member 14 are arranged so that the first mounting member 12 is spaced above the second mounting member 14 on the same central axis, and the main rubber elastic body 16 is elastically connected.

  The main rubber elastic body 16 has a thick-walled large-diameter substantially truncated cone shape, and the first mounting member 12 is inserted into the small-diameter side end portion and vulcanized and bonded, and the large-diameter side end portion The second mounting member 14 is superposed on the outer peripheral surface of the two and vulcanized and bonded. In the present embodiment, the main rubber elastic body 16 is formed as an integral vulcanization molded product including the first mounting member 12 and the second mounting member 14.

  Further, a central recess 28 is opened in the large-diameter side end face of the main rubber elastic body 16. The center recess 28 is formed in a substantially mortar shape with the upper bottom side reversed, and gradually decreases in diameter upward, and the opening side has a cylindrical shape with a substantially constant circular cross section. Further, a thin rubber seal cylinder layer 30 having a substantially cylindrical shape is integrally formed on the peripheral edge of the central recess 28 in the main rubber elastic body 16, and extends downward, so that the second attachment Vulcanized and bonded so as to cover the inner peripheral surface of the small diameter portion 26 of the member 14.

  A flexible film 32 is attached to the lower opening of the second attachment member 14. The flexible film 32 is a thin rubber film having a substantially disk shape, and has sufficient slackness in the axial direction. Further, an annular fixing metal fitting 34 is vulcanized and bonded to the outer peripheral edge of the flexible film 32, and the flexible film 32 is formed as an integrally vulcanized molded product including the fixing metal fitting 34. Then, after the fixing bracket 34 is inserted into the lower end of the small-diameter portion 26 of the second mounting member 14, the second mounting member 14 is subjected to diameter reduction processing such as an eight-way drawing so that flexibility is achieved. The membrane 32 is attached to the second attachment member 14.

  In such a state where the flexible membrane 32 is mounted, the inner surface of the second mounting member 14 is fluid-tightly separated from the outside between the opposing surfaces of the main rubber elastic body 16 and the flexible membrane 32. A fluid sealing region 36 is formed, and an incompressible fluid is sealed. The incompressible fluid sealed in the fluid sealing region 36 is not particularly limited, but water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixture thereof is preferably employed. . Furthermore, a low-viscosity fluid having a viscosity of 0.1 Pa · s or less is desirable in order to efficiently exhibit a vibration isolation effect based on the fluid flow action described later.

  A partition member 38 is disposed in the fluid sealing area 36. The partition member 38 has a substantially disk shape, and includes a partition member main body 40, a bottom fitting 42, and a movable rubber film 44. The partition member main body 40 is a hard member having a substantially disk shape, and a circular upper through hole 46 penetrating in the axial direction is formed at a central portion in the radial direction. In addition, a circumferential groove 48 is formed in the outer peripheral edge of the partition member main body 40 so as to open to the outer peripheral surface and extend in a circumferential direction with a predetermined length of a little less than one round.

  The bottom metal fitting 42 has a thin, generally annular plate shape as a whole, and has a circular lower through hole 50 formed in the radial central portion and sandwiches a step provided in the radial intermediate portion. Thus, the inner peripheral portion is located above the outer peripheral portion. And the bottom metal fitting 42 is overlapped and fixed to the partition member main body 40 from below.

  A movable rubber film 44 is disposed between the partition member main body 40 and the bottom metal fitting 42. The movable rubber film 44 is a rubber elastic body having a substantially disk shape, and has an outer peripheral portion that is a thick portion having a substantially circular cross section that extends in an annular shape in the circumferential direction. The movable rubber film 44 is a tapered surface in which both surfaces of the radial center portion are gradually inclined outward in the axial direction toward the radial center side, and the movable rubber film 44 is gradually thickened toward the radial center. It has become. The movable rubber film 44 is sandwiched between the partition member main body 40 and the bottom metal fitting 42 and disposed in the central portion in the radial direction. In order to close the through-hole 50, it is spread and arranged in the direction perpendicular to the axis.

  The partition member 38 having such a structure is accommodated in the fluid sealing region 36 and supported by the second mounting member 14. That is, the partition member 38 disposed so as to expand in the direction perpendicular to the axis within the fluid sealing region 36 has its outer peripheral surface pressed against the inner peripheral surface of the second mounting member 14 via the seal rubber layer 30. It is fixedly supported by.

  The partition member 38 is disposed in the fluid sealing region 36, so that the fluid sealing region 36 is divided into two parts up and down with the partition member 38 interposed therebetween. That is, above the partition member 38, a part of the wall portion is constituted by the main rubber elastic body 16, and a pressure receiving chamber 52 is formed in which pressure fluctuation is caused when vibration is input. Below the wall 38 is formed an equilibrium chamber 54 in which a part of the wall portion is formed of the flexible film 32 and volume change is easily allowed. The pressure receiving chamber 52 and the equilibrium chamber 54 are filled with incompressible fluid sealed in the fluid sealing region 36, respectively.

  The opening of the circumferential groove 48 is covered with the second mounting member 14, and both circumferential ends of the circumferential groove 48 are communicated with one of the pressure receiving chamber 52 and the equilibrium chamber 54. As a result, an orifice passage 55 that connects the pressure receiving chamber 52 and the equilibrium chamber 54 to each other is formed with a predetermined length of a little less than one round using the circumferential groove 48. Note that the tuning frequency of the orifice passage 55 is adjusted by appropriately adjusting the ratio (A / L) of the passage cross-sectional area (A) and the passage length (L). It is tuned to a corresponding low frequency of about 10 Hz.

  Further, the pressure of the pressure receiving chamber 52 is exerted on one surface of the movable rubber film 44, and the pressure of the equilibrium chamber 54 is exerted on the other surface. When a medium to high frequency vibration corresponding to idling vibration or the like is input, the movable rubber film 44 is positively deformed in a resonance state based on a relative pressure difference between the pressure receiving chamber 52 and the equilibrium chamber 54. It has become.

  An inner bracket 56 is attached to the mount body 11 having such a structure. The inner bracket 56 has a thick, substantially plate shape, and extends outward (rightward in FIG. 1) in one radial direction. In addition, a bolt hole 58 penetrating vertically is formed in the base end portion of the inner bracket 56. Further, the front end portion of the inner bracket 56 is provided with three bolt holes 59, 59, 59 that are spaced apart from each other in the width direction so as to penetrate vertically, so that an attachment portion to the power unit is provided. It is configured. In addition, an insertion recess 60 having a recess shape opened to the lower surface is provided at the proximal end portion in the extending direction of the inner bracket 56 in a shape corresponding to the protrusion 20 of the first mounting member 12. . Further, the inner bracket 56 is formed with a locking groove (not shown) opened on one surface in the width direction so as to extend vertically in the axial direction.

  The inner bracket 56 is attached to a power unit provided with bolt holes 59, 59, and 59 with a base end portion in the extending direction being overlapped with the first attachment member 12 from above and bolted. The part extends to the side. Further, the protrusion 20 of the first mounting member 12 is inserted into the insertion recess 60, whereby the inner bracket 56 is prevented from rotating around the bolt central axis with respect to the first mounting member 12, and the inner bracket 56 is It is positioned with respect to the first mounting member 12. In the present embodiment, the inner bracket 56 is formed with a recess formed in the upper surface at a portion where the bolt hole 58 is formed, and the bolt hole 58 is provided so as to penetrate the bottom wall portion of the recess. ing. Thereby, the head portion of the bolt inserted through the bolt hole 58 is accommodated in the recess, and the amount of protrusion from the upper surface of the inner bracket 56 is suppressed. A bolt projecting upward is provided on the first mounting member 12 side, and the bolt is inserted into the bolt hole 58 of the inner bracket 56 and a nut is fastened to the bolt. The first mounting member 12 and the inner bracket 56 may be fixed.

  On the other hand, an outer bracket 62 is attached to the mount body 11. The outer bracket 62 has a substantially cylindrical fitting portion 64, and is fixed to the mount body 11 by fitting the fitting portion 64 to the second attachment member 14.

  A contact portion 66 is fixed to the fitting portion 64. The contact portion 66 has a plate shape extending in the circumferential direction with a predetermined length, and a plurality of fixing pieces 68 extending downward are integrally formed at a plurality of locations on the circumference. Then, the fixing piece 68 is superimposed on the outer peripheral surface of the upper end of the fitting portion 64 and fixed by means such as welding, so that the contact portion 66 is fixed so as to spread in the direction perpendicular to the fitting portion 64. ing.

  Further, the connecting portion 70 is fixed to the fitting portion 64. The connecting portion 70 has a substantially plate shape reinforced by ribs provided on both sides in the width direction, and is attached to a portion facing the abutting portion 66 on the circumference of the fitting portion 64 in the radial direction. 56 extends toward the opposite side. In addition, the connection part 70 is being fixed with respect to the fitting part 64, when the edge part of the base end side of the extending direction is fixed to the outer peripheral surface of the fitting part 64 by means, such as welding. .

  Furthermore, a gate-shaped member 72 is fixed to the fitting portion 64. The gate-shaped member 72 is integrally provided with a pair of leg portions 74 and 74 that extend substantially in the vertical direction and are opposed to each other, and a beam portion 76 that connects the upper ends of the leg portions 74 and 74 to each other. In addition, contact ribs 78 are integrally formed on both ends of the gate-shaped member 72 in the opening direction (left-right direction in FIG. 1) over substantially the entire length of the leg portions 74 and 74 and the beam portion 76, respectively. The plate-like leg portions 74 and 74 and the beam portion 76 are reinforced by contact ribs 78. The portal member 72 has an intermediate portion between the leg portions 74 and 74 fixed to the outer peripheral surface of the fitting portion 64, and a contact rib 78 that reinforces the leg portions 74 and 74. It is being fixed to the both ends of a direction, and is being fixed to the fitting part 64 by them.

  The outer bracket 62 having such a structure is attached to the second mounting member 14 side by fixing the fitting portion 64 to the second mounting member 14. Note that the upper end portion of the fitting portion 64 is bent toward the inner peripheral side, and the bent portion abuts on the upper end surface of the second attachment member 14, so that the fitting portion 64 is second attached. The outer bracket 62 is positioned at an appropriate position with respect to the mount body 11 by being positioned with respect to the member 14.

  In the engine mount 10 having such a structure, the front end side of the inner bracket 56 is attached to a power unit (not shown), and the connecting portion 70 of the outer bracket 62 is attached to a vehicle body (not shown). It has become. When the engine mount 10 is mounted on the vehicle, the support load of the power unit is input between the first mounting member 12 and the second mounting member 14, and the first mounting member 12 and the second mounting member 14 are attached. The member 14 is relatively approachingly displaced in the axial direction. As a result, the inner bracket 56 and a stopper rubber 80 described later are arranged at a position separated from both of them in the middle of the beam portion 76 and the contact portion 66 of the gate-shaped member 72.

  When a low-frequency vibration corresponding to an engine shake is input between the first mounting member 12 and the second mounting member 14, the orifice passage is caused by the relative pressure fluctuation between the pressure receiving chamber 52 and the equilibrium chamber 54. The fluid flow between the chambers 52 and 54 is generated through 55. As a result, based on the fluid action such as the resonance action of the fluid, the intended vibration isolation effect (high damping effect) is exhibited.

  On the other hand, at the time of medium to high frequency vibration input corresponding to idling vibration, the movable rubber film 44 is positively deformed in a resonant state, so that the intended vibration isolation effect (low dynamic spring effect) is exhibited. It has become.

  Further, the abutting portion 66 of the outer bracket 62 fixed to the second mounting member 14 is opposed to the inner bracket 56 with a predetermined distance in the vertical direction. The relative approach displacement in the vertical direction of the first mounting member 12 and the second mounting member 14 is limited by the contact between the inner bracket 56 and the contact portion 66. Thereby, the bound stopper mechanism which restrict | limits the relative displacement amount to the downward direction with respect to the vehicle body of a power unit is comprised.

  The gate-shaped member 72 of the outer bracket 62 is disposed so as to straddle the inner bracket 56, and the inner bracket 56 extends laterally through one opening of the gate-shaped member 72. The inner bracket 56 and the beam portion 76 of the portal member 72 are vertically opposed to each other, and the first mounting member 12 and the second mounting member 14 are brought into contact with each other by the contact between the inner bracket 56 and the portal member 72. The amount of separation displacement in the vertical direction is limited. Thereby, the rebound stopper mechanism which restrict | limits the amount of upward relative displacement with respect to the vehicle body of a power unit is comprised.

  Further, the inner bracket 56 is opposed to the pair of leg portions 74, 74 of the gate-shaped member 72 in the vehicle front-rear direction (left-right direction in FIG. 2). The relative displacement amount in the vehicle front-rear direction of the first mounting member 12 and the second mounting member 14 is limited by the contact. As a result, a front-rear direction stopper mechanism that limits the amount of relative displacement in the vehicle front-rear direction with respect to the vehicle body of the power unit is configured.

  Since the relative displacement amount of the first mounting member 12 and the second mounting member 14 is limited by these stopper mechanisms, the main rubber elastic body 16 is excessively deformed when shock vibration is input. It is possible to prevent deterioration of durability.

  Further, each stopper mechanism is provided with a buffer rubber by a stopper rubber 80. As shown in FIGS. 8 to 12, the stopper rubber 80 has a substantially bag shape as a whole, and is put on the inner bracket 56 as shown in FIGS. 1 and 2. .

  More specifically, the stopper rubber 80 includes a peripheral wall portion 82 that is overlapped on the end surface and both side surfaces of the inner bracket 56, an upper wall portion 84 that is provided so as to cover the upper opening of the peripheral wall portion 82, And a lower wall portion 86 provided to cover a part of the lower opening of the peripheral wall portion 82.

  The peripheral wall portion 82 is configured by three side wall portions 88a, 88b, and 88c each having a substantially plate shape, and the side wall portion 88b and the side wall portion 88c are in the width direction of the side wall portion 88a (the vertical direction in FIG. 11). The inner bracket 56 has a structure integrally formed so as to extend in the extending direction of the inner bracket 56 (leftward in FIG. 11). The side wall portion 88 a is overlaid on the end face on the proximal end side of the inner bracket 56, and the side wall portion 88 b and the side wall portion 88 c facing each other are overlaid on both side surfaces in the width direction of the inner bracket 56.

  Further, the side wall portion 88 a is provided with a recess extending in the vertical direction at an intermediate portion in the width direction, and is open to a surface overlapped with the inner bracket 56. Further, the side wall portion 88b is provided with a locking projection 90 extending vertically in an intermediate portion in the extending direction, and protrudes inward in the direction facing the side wall portion 88c. Further, the end surfaces of the side wall portions 88 b and 88 c opposite to the side wall portion 88 a are inclined surfaces, and the lower ends of the side wall portions 88 b and 88 c extend larger than the upper end in the extending direction of the inner bracket 56.

  As shown in FIGS. 1 and 8, the upper wall portion 84 has a plate shape, is integrally formed with the peripheral wall portion 82, and is provided so as to cover the upper opening of the peripheral wall portion 82. The upper wall portion 84 is superimposed on the upper surface of the proximal end portion of the inner bracket 56 and is disposed between the inner bracket 56 and the beam portion 76 of the portal member 72. The upper wall portion 84 is provided with a circular insertion hole 92 penetrating vertically, so that the first mounting member 12 and the inner bracket 56 can be fastened with a bolt through the insertion hole 92 after the stopper rubber 80 is attached. It has become.

  As shown in FIGS. 1 and 9, the lower wall portion 86 has a plate shape that extends substantially parallel to the upper wall portion 84, is integrally formed with the peripheral wall portion 82, and is opened downward. A part of the lower opening of the peripheral wall portion 82 is covered. Further, the lower wall portion 86 is integrally formed at the distal end portion (the right end portion in FIG. 1) of the peripheral wall portion 82 in the extending direction of the side wall portions 88b and 88c, and the first mounting member 12 and the inner bracket 56 are connected to each other. The overlapping portion is integrally formed so as to connect the side wall portion 88b and the side wall portion 88c at a position away from the side wall portion 88a. Thus, an area surrounded by the lower end of the peripheral wall portion 82 and the lower wall portion 86 is an opening window 94 that opens downward.

  The stopper rubber 80 is extrapolated from the proximal end side to the distal end side with respect to the inner bracket 56, and is attached without being bonded. Further, the locking protrusion 90 provided on the side wall portion 88 b of the stopper rubber 80 is inserted into a locking groove (not shown) provided on the side surface of the inner bracket 56, so that the stopper rubber 80 is attached to the inner bracket 56. Is positioned. The direction in which the stopper rubber 80 is attached refers to the right side in FIG.

  After the stopper rubber 80 is mounted on the inner bracket 56, the inner bracket 56 is overlapped with the first mounting member 12 through the opening window 94 and fixed with bolts. As a result, the upper wall portion 84 of the stopper rubber 80 is between the inner bracket 56 and the beam portion 76 of the gate-shaped member 72, and the lower wall portion 86 is between the inner bracket 56 and the contact portion 66. , 88c are disposed between the inner bracket 56 and the leg portions 74, 74 of the portal member 72, respectively.

  Further, the lower wall portion 86 of the stopper rubber 80 is overlapped with the lower surface on the front end side with respect to the overlapping portion of the inner bracket 56 on the first mounting member 12, and the end surface located on the side wall portion 88 a side is the first surface. Opposing to the outer peripheral surface of one mounting member 12, the inner bracket 56 is disposed at a predetermined distance in the extending direction.

  Here, as shown in FIG. 13, an annular protrusion 96 is integrally formed on the first mounting member 12. The annular protrusion 96 protrudes radially outward from the outer peripheral surface of the flange portion 22 of the first mounting member 12, and is continuously formed over the entire circumference and has an annular shape. In addition, the annular protrusion 96 is provided on the lower end side of the flange portion 22 and has a smaller thickness dimension in the axial direction than the flange portion 22, and the outer end face 23 ( It is formed so as to protrude downward from the upper end surface by a predetermined distance. Thereby, a step 98 extending in the circumferential direction is provided at a boundary portion between the annular protrusion 96 and the flange portion 22.

  Further, as shown in FIG. 7, the annular protrusion 96 has an outer shape having two sets of two-surface widths on the circumference. That is, both sides in the radial direction (the left-right direction in FIG. 7 which is the opening direction of the gate-shaped member 72) from which the inner bracket 56 extends and the radial direction orthogonal to the both sides (the width direction of the portal-shaped member 72 in FIG. 7). On both sides (in the vertical direction), the outer peripheral surfaces of the annular protrusions 96 are two sets of planes that face each other.

  In the annular protrusion 96, one of the flat portions on the outer peripheral surface is formed on the inner peripheral surface (the left end surface in FIG. 1) of the opening window 94 formed by one surface of the lower wall portion 86 of the stopper rubber 80. On the other hand, they face each other at a predetermined distance in the radial direction. When the stopper rubber 80 is displaced to the base end side (left side in FIG. 1) with respect to the inner bracket 56, the stopper rubber 80 is prevented from being displaced by contacting the annular protrusion 96. A stopper mechanism for the stopper rubber 80 is configured. The inner peripheral surface of the opening window 94 facing the annular protrusion 96 in the direction perpendicular to the axis is a flat surface, and the opposing surface of the annular protrusion 96 and the stopper rubber 80 constituting the retaining mechanism is a predetermined range in the circumferential direction. It is made into the corresponding | compatible shape which contact | abuts by a surface over.

  As is clear from this, in the present embodiment, a positioning protrusion is configured by a part of the circumference of the annular protrusion 96, and the positioning protrusion protrudes toward the distal end side of the inner bracket 56. It faces the stopper rubber 80 in the direction perpendicular to the axis.

  Further, in the engine mount 10, it is possible to set the separation distance d between the annular projecting portion 96 constituting the retaining mechanism and the lower wall portion 86 of the stopper rubber 80 to be sufficiently small. That is, when the separation distance D between the flange portion 22 and the lower wall portion 86 is sufficiently larger than the separation distance d between the annular protrusion 96 and the lower wall portion 86, and the separation distance d is small. Also, the flash formed at the upper end of the lower wall portion 86 is between the overlapping surfaces of the first mounting member 12 and the inner bracket 56 (the outer end surface 23 of the first mounting member 12 and the lower surface of the base end portion of the inner bracket 56). Can be avoided. Therefore, a decrease in the fastening force due to the biting of the flash is prevented, and the first mounting member 12 and the inner bracket 56 are fixed without looseness by the bolts. Further, the displacement of the stopper rubber 80 due to the contact with the annular protrusion 96 is prevented as quickly as possible, the deterioration of durability due to partial wear of the stopper rubber 80 is prevented, and each stopper mechanism. The shock-absorbing property is maintained, and deterioration of ride comfort can be prevented.

  In addition, the opposing surfaces of the lower wall portion 86 and the annular protrusion 96 of the stopper rubber 80 have shapes corresponding to each other and come into contact with the surfaces. Therefore, a large contact area between the stopper rubber 80 and the annular protrusion 96 is ensured, and damage due to partial wear and stress concentration in the stopper rubber 80 is avoided, thereby improving durability. .

  The annular protrusion 96 is integrally formed so as to protrude from the tip of the flange portion 22 toward the outer peripheral side, and is formed as a part of the first mounting member 12. Therefore, the overlapping surface of the first mounting member 12 and the inner bracket 56 and the lower wall portion 86 of the stopper rubber 80 are positioned at a predetermined distance with a small number of parts without using a special member.

  Further, the peripheral wall portion 82 of the stopper rubber 80 is configured such that the lower end thereof does not reach the first mounting member 12 in a state of being attached to the inner bracket 56. Therefore, even if a flash is formed at the lower end of the peripheral wall portion 82, the flash can be prevented from being sandwiched between the first mounting member 12 and the inner bracket 56, and the first mounting member 12 can be avoided. The inner bracket 56 is firmly fixed.

  In addition, since the locking protrusion 90 is inserted into the locking groove, the displacement of the stopper rubber 80 with respect to the inner bracket 56 is more effectively prevented by cooperation with the retaining mechanism. In particular, by using together the engaging action of the locking protrusion 90 and the locking groove and the direct displacement regulation by the contact between the stopper rubber 80 and the first mounting member 12, Positioning of the stopper rubber 80, which was difficult only by engagement with the locking groove, can be realized advantageously.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the positioning protrusion of the first mounting member 12 may be in contact with the lower wall portion 86 of the stopper rubber 80 in an initial state where no vibration is input. More specifically, the lower wall portion 86 of the stopper rubber 80 may be pressed against the positioning protrusion in advance to be compressed and deformed.

  In the case where the positioning protrusion is constituted by a part of the annular protrusion 96 as in the above embodiment, if the mount main body 11 and the outer bracket 62 have a structure in which the circumferential direction is not specified, the inner protrusion The orientation of the bracket 56 relative to the mount body in the circumferential direction can be set arbitrarily or one of a plurality. Therefore, the positioning of the inner bracket 56 becomes unnecessary or simple in the mounting work of the inner bracket 56, and the manufacturing becomes easy.

  However, the positioning protrusion does not necessarily have to be formed as a part of the annular protrusion 96. For example, the positioning protrusion is formed on the circumference of the first mounting member 12 with the lower wall portion 86 of the stopper rubber 80. You may form only in the part which opposes. According to this, an extra protrusion can be reduced and weight reduction and the improvement of a yield can be implement | achieved.

  Further, the facing surface between the positioning protrusion and the inner peripheral surface of the opening window 94 is not limited to a flat surface, and may be curved surfaces having corresponding shapes that touch each other. In addition, the facing surfaces are not necessarily limited to those that come into contact with the surface. For example, the distal end surface of the positioning protrusion may be a curved surface, and the inner peripheral surface of the opening window 94 may be a flat surface. .

  Further, the positioning protrusions constituting the retaining mechanism and the facing surface of the stopper rubber 80 do not necessarily have to be in contact with each other only at a part of the circumference, and may be in partial contact at a plurality of locations on the circumference. It may be. In addition, when abutting at a plurality of locations, it is desirable that each abutting location abuts the surface with a predetermined length in the circumferential direction.

  Further, the flange portion 22 is not essential, and for example, the annular protrusion 96 may be provided so as to protrude directly at a position with a predetermined distance downward from the upper end of the outer peripheral surface of the first mounting member 12. good.

  Further, the positioning protrusion is not limited to the one integrally formed with the first mounting member 12. For example, the positioning protrusion is a separate member from the first mounting member 12, and is formed on the outer peripheral surface of the first mounting member 12. It may be fixed.

  In addition to the fluid-filled type shown in the above embodiment, the mount body 11 does not have a fluid-filled region 36 and is of a solid type that utilizes the vibration-proof effect exhibited by deformation of the body rubber elastic body 16. A mount body can also be used. Furthermore, an active fluid-filled vibration isolator that actively applies a vibration force from the outside to the pressure receiving chamber 52 to cancel or reduce the input vibration can be adopted as the mount body 11.

  The scope of application of the present invention is not limited to automobiles, and is suitably employed for, for example, motorcycles, industrial vehicles, railway vehicles, and the like. Furthermore, the present invention can be applied to a body mount, a subframe mount, a differential mount, and the like in addition to the engine mount.

10: engine mount (vibration isolation device), 12: first mounting member, 14: second mounting member, 16: main rubber elastic body, 23: outer end face, 56: inner bracket, 72: portal member, 80 : Stopper rubber, 82: Peripheral wall part, 84: Upper wall part, 86: Lower wall part, 94: Opening window, 96: Annular protrusion, 98: Step

Claims (4)

The first mounting member and the second mounting member are connected by a main rubber elastic body, and the base end side of the inner bracket is superimposed on the outer end surface of the first mounting member and bolted to the side. While extending, the mounting portion to the power unit is provided on the tip side extending to the side of the inner bracket,
A gate-shaped member straddling the inner bracket is attached to the second attachment member, and a bound stopper mechanism is configured at a portion where the inner bracket and the second attachment member are opposed to each other. A rebound stopper mechanism is configured at a portion facing the portal member,
Further, the inner bracket is covered with a bag-like stopper rubber from the base end side and is attached non-adheringly, and the stopper rubber is disposed between the opposing surfaces of the bound stopper mechanism and the rebound stopper mechanism. In addition, in the vibration isolator wherein the first mounting member is overlapped with the inner bracket and fixed with bolts through an opening window formed in the stopper rubber,
The first mounting member is formed with a positioning protrusion protruding on the outer peripheral surface toward the tip end side of the inner bracket at a position with a predetermined distance inward from the outer end surface. An anti-vibration device characterized in that the projecting tip surface is opposed to the inner peripheral surface of the opening window of the stopper rubber.   The anti-vibration device according to claim 1, wherein an inner peripheral surface of the opening window of the stopper rubber and a protruding front end surface of the positioning protrusion of the first mounting member have a corresponding shape that touches each other. .   On the outer peripheral surface of the first mounting member, an annular protrusion is formed extending in the circumferential direction on the outer periphery of the first mounting member by a step extending in the circumferential direction at a position a predetermined distance inward from the outer end. The vibration isolator according to claim 1, wherein the positioning protrusion is configured by the annular protrusion.   The stopper rubber is provided with three peripheral wall portions that are overlapped with the end surface and both side surfaces of the base end side of the inner bracket, and is provided so as to cover the upper opening of the three peripheral wall portions. The wall portion is overlaid on the surface of the inner bracket facing the portal member, while the lower opening of the three peripheral wall portions is open toward the first mounting member, and the stopper A lower wall portion is provided to cover the lower opening so as to be located behind the overlapping portion of the inner bracket on the first mounting member in the mounting direction of the rubber to the inner bracket. Of the opening window in which the end surface on the first mounting member side of the lower wall portion projecting downward from the overlapping surface of the first mounting member faces the projecting tip surface of the positioning projection. The inner surface Vibration damping device according to any one of claims 1 to 3 that.

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