JP4340911B2 - Vibration isolator - Google Patents

Description

  The present invention relates to an anti-vibration device in which a first attachment member and a second attachment member are elastically connected by a main rubber elastic body to obtain an anti-vibration effect by elastic deformation of the main rubber elastic body. In particular, the present invention relates to a vibration isolator provided with a stopper mechanism that limits the deformation amount of the main rubber elastic body when an excessive load is input.

  Conventionally, an anti-vibration device in which a main rubber elastic body is disposed between a first attachment member and a second attachment member that are attached to anti-vibration-connected members has been widely used in various fields. As an example, for example, there is an engine mount as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2004-1000078).

  In such a vibration isolator, when the large amplitude vibration is input, the first mounting member and the second mounting member are relatively excessively displaced, and excessive elastic deformation occurs in the main rubber elastic body. A stopper mechanism that limits the relative displacement between the first mounting member and the second mounting member in order to prevent the main rubber elastic body from cracking due to elastic deformation and reducing the durability of the main rubber elastic body. May be provided. The engine mount disclosed in Patent Document 1 is provided with a stopper mechanism that limits the approaching displacement in the axial direction and the relative displacement in the direction perpendicular to the axis of the first mounting member and the second mounting member.

  However, the stopper mechanism shown in the engine mount described in Patent Document 1 is still insufficient. That is, particularly when traveling on rough roads, the first mounting member and the second mounting member are not only excessively displaced relatively in the direction in which they approach each other in the axial direction (bound direction), but also in the axial direction. Even in the direction of separation (rebound direction), there may be excessive relative displacement. However, in the engine mount stopper mechanism described in Patent Document 1, while the relative displacement limiting effect by the bound stopper mechanism can be obtained with respect to the vibration load in the bound direction, the vibration load in the rebound direction is There is no effective rebound stopper mechanism.

  Therefore, in order to solve such a problem, a vibration isolator having a rebound stopper mechanism that restricts the relative displacement of the first mounting member in the pulling direction from the second mounting member has been proposed. Moreover, such a rebound stopper mechanism may be comprised by the separate stopper member retrofitted with respect to a mount depending on the shape etc. of the structural member of a vibration isolator. As a vibration isolator having such a separate stopper member, for example, there is a composite mount described in Patent Document 2. In the composite mount described in Patent Document 2, a stopper arm that spreads outward in the direction perpendicular to the axis is formed integrally with a stopper metal fitting that has a bottomed cylindrical shape, and a stopper rubber is provided at the outer peripheral end of the stopper arm. The rebound stopper formed separately from the first mounting member (main part) is attached to the mount by extrapolating the stopper fitting with respect to the main part. A rebound stopper mechanism is configured.

  However, there is still a problem with the rebound stopper in the composite mount described in Patent Document 2 and it has been difficult to say that it is sufficiently practical. In other words, in order to assemble the rebound stopper, which is a separate body, with respect to the first mounting member in an extrapolated state, the dimensions of the stopper fitting that is the mounting portion of the first mounting member and the rebound stopper are matched with high accuracy. Since it is necessary, manufacturing is likely to be difficult. In addition, the mounting portion (stopper bracket) of the first mounting member and the rebound stopper is formed of a relatively soft metal such as aluminum, and the rebound stopper is mounted on the first mounting member by press-fitting. In this case, there is a possibility that a problem such as deformation or breakage may occur due to a dimensional error between the first mounting member and the stopper fitting.

  In addition, since the central portion of the stopper bracket in the direction perpendicular to the axis is fixed by being overlapped in the axial direction with respect to the first mounting member, the area of the overlapping surface in the axial projection is not sufficiently large Therefore, it is difficult to ensure sufficient load resistance in the bounce direction, which is the axial direction opposite to the rebound direction. In addition, in order to obtain sufficient load resistance in the bound direction, if the area of the overlapping surface of the stopper fitting and the first mounting member is sufficiently wide, the length of the stopper arm that extends outward in the direction perpendicular to the axis is increased. It is difficult to obtain sufficiently, and the size of the stopper rubber that is fixed to the tip of the stopper bracket is reduced. Therefore, the contact area between the stopper bracket and the stopper bracket via the stopper rubber is reduced, resulting in stress concentration. Insufficient load resistance in the rebound direction, such as damage to stopper rubber, stopper metal fittings, contact metal fittings, etc., may become a problem. Further, in order to obtain a sufficiently long stopper arm while ensuring a sufficient area of the overlapping surface of the abutment metal fitting and the first mounting member, at least the second mounting portion is provided at the portion where the stopper mechanism is disposed. Although it is necessary to increase the diameter of the member, it is difficult to say that it is practical in a vibration isolator having a limited installation space because it may directly increase the size of the entire apparatus.

Japanese Patent Laid-Open No. 2004-1000078 Japanese Utility Model Publication No. 6-33228

  Here, the present invention has been made in the background as described above, and the problem to be solved is to determine the relative displacement amount in the extraction direction of the first mounting member and the second mounting member. Anti-vibration device with a new structure that can be configured with excellent load resistance without requiring high-accuracy dimensional control of the first mounting member and stopper member for the rebound stopper mechanism that can be limited in a buffering manner It is to provide.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

  That is, according to the first aspect of the present invention, the first mounting member is inserted in the axial direction on the central axis from one axial opening of the second mounting member having a cylindrical shape, and predetermined in the direction perpendicular to the axis. In the vibration isolator which is arranged at a distance and connects the first mounting member and the second mounting member in a direction perpendicular to the axis by a main rubber elastic body, the main rubber elastic body in the first mounting member A stepped stopper receiving surface is provided on the protruding portion from the first mounting member, and an annular stopper fitting that is externally attached to the first mounting member is employed. (I) from the inner peripheral edge of the stopper bracket toward one side in the axial direction. Protruding cylindrical press-fit rubber, and (ii) the stopper A stopper member is formed by integrally forming an interposed rubber covering the inner peripheral surface of the tool and (iii) a buffer rubber covering one end surface in the axial direction of the stopper fitting with the elastic rubber body. A member is extrapolated from the axially projecting end side of the first mounting member, and the press-fitted rubber is press-fitted and fixed to the first mounting member, whereby the press-fitted rubber is removed from the stopper fitting. Extending toward the axially projecting end side of the member, the engaging surface of the stopper fitting is overlapped with the stopper receiving surface of the first mounting member in the axial direction via the interposed rubber. The stopper member is mounted in a state, while extending from the second mounting member to the axial direction in which the first mounting member protrudes and is positioned outward of the stopper member in the axial direction. And make contact with the cushion rubber. By providing the second mounting member with a contact portion to be supported, the stopper member is brought into contact with the corresponding contact portion so that the first mounting member and the second mounting member are moved relative to one side in the axial direction. The present invention is characterized in that a rebound stopper mechanism that limits the amount of displacement in a buffer manner is configured.

  In the vibration isolator having the structure according to this aspect, the stopper member is mounted by press-fitting and fixing the press-fitted rubber to the first mounting member. Thereby, the problem of the dimensional error of the internal diameter dimension of a stopper metal fitting and the outer diameter dimension of a 1st attachment member can be avoided, and a stopper member can be attached to a 1st attachment member.

  In other words, since it is not necessary to press-fit and fix the stopper bracket directly to the first mounting member, the inner diameter dimension of the stopper bracket can be set sufficiently larger than the outer diameter dimension of the first mounting member. Become. Moreover, the fixing force of the stopper member to the first mounting member can be stably and flexibly ensured by the elasticity of the press-fitted rubber. As a result, even if there is a dimensional error between the stopper bracket and the first mounting member, the stopper bracket may be damaged when the stopper member is mounted, the stopper member cannot be mounted, or the stopper member may easily fall off. Problems such as becoming bad are avoided.

  Moreover, in this aspect, the engaging surface of the stopper fitting is overlapped with the stopper receiving surface of the first mounting member in the axial direction via the interposed rubber. Accordingly, the load acting on the stopper member in the axial direction can be distributed and supported over a wider range of the stopper receiving surface by dispersing the elasticity of the interposed rubber. Thereby, at the time of inputting the stopper load, it is possible to advantageously avoid the deformation and breakage of the first mounting member and the stopper fitting due to the stress concentration.

  The stopper receiving surface formed on the first mounting member and the engaging surface formed on the stopper fitting do not necessarily have to be formed over the entire circumference of the first mounting member. It may be formed partially or intermittently. The intervening rubber is formed at least on the stepped engagement surface formed on the inner peripheral surface of the stopper fitting, and preferably between the overlapping surface of the engagement surface and the stopper receiving surface. It is more preferably formed in a larger area than between the overlapping surfaces over the entire overlapping surface.

  In addition, according to a second aspect of the present invention, in the vibration isolator according to the first aspect, the outer end surface in the axial direction of the main rubber elastic body gradually increases outward in the axial direction from the center in the radial direction. Due to the inclined surface projecting, a recess opening between the radially opposing surfaces of the first mounting member and the second mounting member is formed at the axial end of the main rubber elastic body. It is characterized by being.

  In the vibration isolator having the structure according to this aspect, the main rubber elastic body and the stopper are provided by providing a recess in the axial end surface of the main rubber elastic body that is positioned opposite to the stopper member in the axial direction. Interference of members can be avoided. That is, by providing the recess, the axial distance between the stopper member and the main rubber elastic body in the axial direction can be set large while suppressing the overall axial size of the vibration isolator. Therefore, even when the main rubber elastic body bulges and deforms outward in the axial direction when a load is input, it is possible to prevent interference with the stopper member and improve the durability of the main rubber elastic body.

  More preferably, the stopper member is attached to the first mounting member in a state where at least a part of the stopper member enters a recess formed in the axial end portion of the main rubber elastic body. Thereby, it is possible to employ the stopper member while further reducing the axial size of the vibration isolator.

  In addition, according to a third aspect of the present invention, in the vibration isolator according to the first or second aspect, on both sides of the first mounting member sandwiched in one direction perpendicular to the axis, A pair of pocket portions are formed on the outer peripheral surface, and the openings of the pair of pocket portions are fluid-tightly covered with the second mounting member, so that a part of the wall portion is configured by the main rubber elastic body. A pair of working fluid chambers in which an incompressible fluid is sealed are formed, and an orifice passage that communicates the pair of working fluid chambers with each other is provided.

  In the vibration isolator having the structure according to this aspect, the vibration is more excellent based on the fluid flow through the orifice passage between the pocket portions against the input vibration in the direction perpendicular to the axis where the pair of pocket portions face each other. Anti-vibration effect can be obtained. In particular, this aspect can be suitably employed in combination with the second aspect. That is, since the pocket portion is formed in the main rubber elastic body, the main rubber elastic body is relatively elastically deformed during vibration input, and interference with the stopper member is likely to be a problem. By adopting a structure in which a recess is formed at the end of the body in the axial direction, the anti-vibration effect against vibration input in the direction perpendicular to the axis is achieved while reducing or avoiding interference of the main rubber elastic body with the stopper member. It may be possible to realize a vibration isolator capable of effectively exhibiting the above.

  According to a fourth aspect of the present invention, in the vibration isolator according to any one of the first to third aspects, an inner peripheral surface of the press-fitted rubber has a long cylindrical shape. The pressure input to the first mounting member is set larger in the large diameter direction than in the small diameter direction.

  In the vibration isolator having the structure according to this aspect, the amount of elastic deformation at the time of press-fitting the press-fitted rubber to the first mounting member while advantageously securing the press-fitting fixing force to the first mounting member by the press-fitted rubber is advantageous. It is possible to improve the durability of the press-fitted rubber while keeping the pressure small. In this embodiment, the inner diameter dimension of the press-fit rubber, the outer diameter dimension of the first mounting member, etc. are set so that the press input is effectively applied substantially only in the large-diameter direction of the press-fit rubber. Is more desirable. That is, in the small-diameter direction of the press-fitted rubber, the internal dimensions in the small-diameter direction on the inner peripheral surface of the press-fitted rubber are set so that the tightening force of the rubber elastic body does not substantially act. It is desirable to set the same size as the outer diameter.

  As is apparent from the above description, in the vibration isolator having the structure according to the present invention, the stopper member is made into the first mounting member by press-fitting the elastically deformable press-fit rubber into the first mounting member. On the other hand, it is not necessary to press-fit and fix the stopper fitting to the first mounting member. Therefore, it is possible to avoid problems such as chipping, scraping and damage of the member when the metal fitting is press-fitted due to a dimensional error between the stopper metal fitting and the first mounting member. In addition, since the engaging surface of the stopper fitting is superimposed on the stopper receiving surface of the first mounting member via the interposed rubber, the axial load can be shared and supported over a wide range of the stopper receiving surface. A rebound stopper mechanism having excellent load resistance can be realized.

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

  First, FIGS. 1 to 3 show an automobile engine mount 10 as a vibration isolator as a first embodiment of the present invention. The engine mount 10 includes a first mounting member 12 as a first mounting member and a second mounting member 14 as a second mounting member that are spaced apart from each other in the direction perpendicular to the axis. The first mounting bracket 12 and the second mounting bracket 14 have a structure in which the main rubber elastic body 16 is elastically connected. The first mounting bracket 12 is attached to a power unit of an automobile not shown, while the second The mounting bracket 14 is attached to a vehicle body (not shown), so that the power unit is supported in a vibration-proof manner with respect to the body. Since the engine mount 10 of the present embodiment is mounted in a state where the vertical direction in FIG. 1 is a substantially vertical vertical direction, in the following description, the vertical direction is, as a general rule, FIG. The inside vertical direction shall be said.

  More specifically, the first mounting bracket 12 has a mounting portion 18 and a fixing portion 20. The mounting portion 18 has a rod shape that extends in the axial direction up and down with a substantially constant oval cross section, and penetrates the upper end portion in the axial direction in the minor axis direction of the mounting portion 18 that is one direction perpendicular to the axis. Bolt holes 22 are formed. The attaching portion 18 is protruded upward in the axial direction from a main rubber elastic body 16 described later. An adhering portion 20 is integrally formed below the mounting portion 18 in the axial direction. The fixing portion 20 has a substantially cylindrical shape, and the outer diameter dimension of the upper end portion thereof is substantially equal to the major diameter dimension of the mounting portion 18. Further, a tapered portion 24 is provided at a part of the middle portion in the axial direction of the fixing portion 20. An upper portion in the axial direction is the large-diameter portion 26 with the tapered portion 24 in between, and a small-diameter portion 28 is in the lower portion in the axial direction. Furthermore, since the mounting portion 18 having a substantially oval cross section and the fixing portion 20 having a substantially circular cross section are integrally formed, the boundary portion between the mounting portion 18 and the fixing portion 20 is opposed in the short diameter direction of the mounting portion 18. A pair of step surfaces 30 are formed as stopper receiving surfaces to be positioned.

  In addition, a metal sleeve 32 as an intermediate sleeve having a thin and large-diameter substantially cylindrical shape is arranged on substantially the same central axis as the first mounting bracket 12 so as to be spaced apart radially outward of the first mounting bracket 12. It is installed. The metal sleeve 32 has a large diameter via a stepped portion that extends outward in the radial direction with respect to one axial end (axial upper end) of the small diameter cylindrical portion 34 linearly extending in the axial direction. The cylindrical portion 36 has a substantially stepped cylindrical shape integrally formed. In addition, a pair of window portions 38 are arranged in the axially intermediate portion of the metal sleeve 32 so as to be opposed to each other with the first mounting member 12 sandwiched in one radial direction in the arrangement state with respect to the first mounting member 12 described later. Is formed. In addition, each window part 38 in this embodiment is opened and formed by the length of a half circumference in the circumferential direction. Further, the window portion 38 is formed to include a portion in which a stepped portion is formed in the axial direction, and is formed to be biased upward in the axial direction in the main rubber elastic body 16.

  The first mounting bracket 12 and the metal sleeve 32 having such a structure are inserted into the first mounting bracket 12 from the opening on one side of the metal sleeve 32 (the upper opening in FIG. 1). Thus, the first mounting member 12 is disposed so as to be separated from the metal sleeve 32 in the direction perpendicular to the axis with the same central axis. In the present embodiment, the first mounting member 12 is positioned such that an end portion on one side in the axial direction protrudes from an opening portion on one side in the axial direction of the metal sleeve 32, and the axial direction The end portion on the other side is positioned at an intermediate portion in the axial direction that does not reach the end portion on the other side in the axial direction of the metal sleeve 32.

  A main rubber elastic body 16 is disposed between the first mounting bracket 12 and the metal sleeve 32 facing each other in the direction perpendicular to the axis. The main rubber elastic body 16 allows the first mounting metal 12 (adhesion). The tapered portion 24 and the small diameter portion 28) in the portion 20 and the metal sleeve 32 are elastically connected. The main rubber elastic body 16 has a thick, generally cylindrical shape as a whole, and its inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the fixing portion 20 of the first mounting bracket 12. The outer peripheral surface is vulcanized and bonded to the inner peripheral surface of the metal sleeve 32. That is, in this embodiment, the main rubber elastic body 16 is an integrally vulcanized molded product 40 including the first mounting bracket 12 and the metal sleeve 32. The main rubber elastic body 16 is gradually protruded toward both sides in the axial direction as it is separated from the first mounting member 12 outward in the direction perpendicular to the axis. Is gradually growing.

  Further, the main rubber elastic body 16 is formed with a circular recess 42 having an inverted mortar shape that opens downward in the axial direction in the central portion of the lower end surface in the axial direction, and is formed in the axially intermediate portion to form the shaft. A pair of pocket portions 44 that are open in a perpendicular direction are formed. Each of the pair of pocket portions 44 has an expanded shape in which the axial width dimension gradually increases outward in the direction perpendicular to the axis, and is formed with a length of slightly less than a half circumference in the circumferential direction. Further, the inner wall surfaces on both sides in the axial direction of the pocket portion 44 are gradually inclined toward the outer side in the axial direction (upward and downward in the axial direction) as they are separated from the first mounting member 12 in the direction perpendicular to the axial direction. Accordingly, the wall portions on both sides in the axial direction of the pocket portion 44 are inclined and extend with a substantially constant thickness. Further, the wall portions on both sides in the axial direction of the pocket portion 44 are thinner in the wall portion on the upper side in the axial direction than the wall portion on the lower side in the axial direction. The pair of pocket portions 44 are formed on both sides of the first mounting bracket 12 in one direction perpendicular to the axis and are directed outward in the direction perpendicular to the axis through the window 38 formed in the metal sleeve 32. Open.

  On the other hand, the second mounting bracket 14 has a thin cylindrical shape with a large diameter as a whole. In addition, a support step 46 is formed in a part of the second mounting bracket 14 in the axial direction, and one side in the axial direction (upward in FIG. 1) sandwiching the support step 46 has a thin large diameter. A peripheral wall portion having a substantially cylindrical shape and having a cylindrical shape with the other side in the axial direction (downward in FIG. 1) sandwiching the support step 46 and having a smaller diameter than the holding cylinder portion 48. 50. Further, a diaphragm 52 as a flexible film is disposed in the opening on the peripheral wall 50 side of the second mounting member 14. The diaphragm 52 is formed of a thin elastomer material having a flexure, has a substantially circular dome shape, and can easily be elastically deformed. Further, the outer peripheral edge portion of the diaphragm 52 is vulcanized and bonded to the peripheral wall portion 50 of the second mounting bracket 14 over the entire circumference, whereby the diaphragm 52 is opened on the peripheral wall portion 50 side of the second mounting bracket 14. As a result, the opening on the peripheral wall 50 side in the axial direction of the second mounting bracket 14 is fluid-tightly closed by the diaphragm 52. The inner peripheral surface of the second mounting bracket 14 is covered over substantially the entire surface by the seal rubber layer 54 formed integrally with the diaphragm 52.

  In the second mounting bracket 14 having such a structure, the integrally vulcanized molded product 40 is inserted and arranged on the same central axis from one end in the axial direction, and the opening edge on one side in the axial direction. Is positioned with respect to the opening edge of the metal sleeve 32 on the large-diameter cylindrical portion 36 side, and the diameter of the second mounting bracket 14 is reduced by eight-way drawing or the like, whereby an integrally vulcanized molded product 40 is obtained. The second mounting bracket 14 is attached to the (metal sleeve 32) in an externally fitted state. A seal rubber layer 54 is interposed in a compressed state between the fitting surfaces of the second mounting bracket 14 and the metal sleeve 32, and the second mounting bracket 14 and the metal sleeve 32 are fluid-tightly fitted. ing.

  Then, the second mounting bracket 14 is fitted and fixed to the metal sleeve 32 in this manner, so that the first mounting bracket 12 enters from the opening on one side in the axial direction of the second mounting bracket 14. The first mounting bracket 12 and the second mounting bracket 14 are disposed on the same central axis so as to be separated from each other by a predetermined distance in the direction perpendicular to the axis. 16 is elastically connected.

  Further, when the second mounting bracket 14 is externally fixed to the metal sleeve 32 in this manner, the opening on the holding cylinder portion 48 side of the second mounting bracket 14 is fluid-tightened by the main rubber elastic body 16. A first fluid chamber 56 in which an incompressible fluid is sealed is formed between the axially opposing surfaces of the main rubber elastic body 16 and the diaphragm 52. As the incompressible fluid sealed in the first fluid chamber 56, for example, water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixture thereof is suitably used. In particular, as the sealed fluid, it is desirable to employ a low-viscosity fluid having a viscosity of 0.1 Pa · s or less in order to advantageously obtain an anti-vibration effect based on the resonance action of the fluid through the orifice passage described later.

  In addition, a partition member 58 having a substantially disk shape as a whole is disposed in the first fluid chamber 56 so as to spread in the direction perpendicular to the axis within the first fluid chamber 56. The partition member 58 is formed by superposing a lid member 62 having a thin, substantially disk shape on an upper surface in the axial direction of a partition member body 60 having a thick, substantially disk shape. Further, the outer peripheral edge of the partition member 58 is held between the opposing surfaces of the lower end surface in the axial direction of the main rubber elastic body 16 and the upper surface of the support step 46 of the second mounting bracket 14, so that the partition member 58 is held in the main body. The rubber elastic body 16 and the diaphragm 52 are accommodated and disposed so as to spread in the direction perpendicular to the axis between the opposing surfaces.

  Thus, the partition member 58 is arranged so as to extend in the direction perpendicular to the axis between the opposing surfaces of the main rubber elastic body 16 and the diaphragm 52, so that the first fluid chamber 56 is placed vertically with the partition member 58 interposed therebetween. It is divided into two. As a result, on the upper side in the axial direction of the partition member 58, a part of the wall portion is configured by the main rubber elastic body 16, and pressure fluctuation is caused based on elastic deformation of the main rubber elastic body 16 at the time of vibration input. On the other hand, a chamber 64 is formed. On the lower side in the axial direction of the partition member 58, a part of the wall portion is constituted by the diaphragm 52, and the volume change due to the deformation of the diaphragm 52 is easily allowed. Is formed. In the present embodiment, the lower surface recess 68 that opens downward in the axial direction is formed in the center portion of the lower surface of the partition member main body 60, and the partition member 58 effectively avoids interference with the deformation of the diaphragm 52. is doing.

  Further, the partition member 58 is formed with a groove 70 that is open to the outer peripheral surface and extends in the circumferential direction with a length of a little less than one round. The opening of the groove 70 is fluid-tight by the second mounting bracket 14. A tunnel-like flow path is formed by being closed. Further, both end portions of the tunnel-shaped flow path are connected to the pressure receiving chamber 64 and the equilibrium chamber 66, respectively, and the flow path extends in the circumferential direction of the outer peripheral portion of the partition member 58 to balance the pressure receiving chamber 64. A first orifice passage 72 is formed to communicate the chamber 66 with each other. As a result, the pressure receiving chamber 64 and the equilibrium chamber 66 are always in communication with each other through the first orifice passage 72, and the flow of the sealed fluid occurs between the pressure receiving chamber 64 and the equilibrium chamber 66 through the first orifice passage 72. It is supposed to be. In particular, in the present embodiment, by adjusting the passage length and the passage cross-sectional area of the first orifice passage 72, a high damping effect based on the resonance action of the fluid flowing through the first orifice passage 72, etc. It is designed for vibration input in the low frequency range corresponding to shake.

  Further, a central recess 74 that opens upward in the axial direction is formed in the central portion in the direction perpendicular to the axis of the partition member main body 60, and a movable rubber plate 76 having a substantially disc shape is formed in the central recess 74. While being housed, the opening of the central recess 74 is covered with a lid member 62. The movable rubber plate 76 has a plurality of ridges 78 formed on the upper surface and the lower surface of the radially intermediate portion so as to extend in the circumferential direction at predetermined intervals, and the elasticity of the movable rubber plate 76 to be described later. At the time of deformation, damage to the other members of the movable rubber plate 76 (the partition member main body 60 and the lid member 62) is prevented, and the durability is improved. Occurrence and the like are effectively reduced or avoided. Further, an annular support portion 80 is formed on the outer peripheral edge portion of the movable rubber plate 76 so as to be thicker than the center portion. The annular support portion 80 is sandwiched between the partition member main body 60 and the lid member 62. Thus, the movable rubber plate 76 is disposed with respect to the central recess 74 in a state where the central portion of the movable rubber plate 76 is allowed to be elastically deformed in a predetermined amount in the axial direction. A plurality of through holes 82 are formed in the upper and lower walls of the central recess 74 formed by the partition member main body 60 and the lid member 62 so as to penetrate in the axial direction. 64 and the hydraulic pressure of the equilibrium chamber 66 are adapted to act on the upper and lower surfaces of the movable rubber plate 76 disposed in the central recess 74. An amount corresponding to the amount of elastic deformation of the movable rubber plate 76 by elastically deforming the movable rubber plate 76 based on the pressure difference between the pressure receiving chamber 64 and the equilibrium chamber 66 exerted on the upper and lower surfaces of the movable rubber plate 76. Only the fluid flow between the pressure receiving chamber 64 and the equilibrium chamber 66 through the through hole 82 and the central recess 74 formed in the partition member main body 60 and the lid member 62, respectively, is substantially generated. Thus, the pressure fluctuation in the pressure receiving chamber 64 caused at the time of vibration input is reduced or absorbed. In particular, in this embodiment, the pressure fluctuation of the pressure receiving chamber 64 is movable when high-frequency small amplitude vibration such as a booming sound is input due to the elasticity of the movable rubber plate 76 and the contact of the movable rubber plate 76 with the inner surface of the central recess 74. While it can be advantageously reduced or absorbed based on the elastic deformation of the rubber plate 76, the elastic deformation of the movable rubber plate 76 is limited when the low-frequency large-amplitude vibration such as an engine shake is input. Effective pressure fluctuation is induced, and it is possible to ensure a sufficient amount of fluid flow through the first orifice passage 72 and to effectively exhibit the vibration-proofing effect based on the fluid flow action. Has been.

  On the other hand, when the second mounting bracket 14 is externally fitted and fixed to the metal sleeve 32, the pair of window portions 38 formed in the metal sleeve 32 are covered fluid-tightly by the second mounting bracket 14. Yes. Thereby, the opening of the pair of pocket portions 44 is covered with the second mounting bracket 14, and a pair of actions in which an incompressible fluid is sealed on both sides sandwiching the first mounting bracket 12 in one direction perpendicular to the axis. A second fluid chamber 84 is formed as a fluid chamber. The second fluid chamber 84 is filled with an incompressible fluid similar to the incompressible fluid sealed in the first fluid chamber 56.

  A cylindrical orifice member 86 is disposed between the opposing surfaces of the second mounting bracket 14 and the metal sleeve 32. The cylindrical orifice member 86 has a substantially cylindrical shape having a circumferential length of more than half a circumference (in this embodiment, a circumferential length of about 3/4 circumference), and is made of a hard material such as synthetic resin or metal. It is formed. In the present embodiment, the inner diameter dimension of the cylindrical orifice member 86 is substantially the same as or slightly larger than the outer diameter dimension of the small diameter cylindrical portion 34 of the metal sleeve 32, and the outer diameter dimension of the cylindrical orifice member 86. Is substantially the same as the outer diameter of the large-diameter cylindrical portion 36 of the metal sleeve 32. Further, the cylindrical orifice member 86 is assembled by being externally attached to the metal sleeve 32 from the axial end portion on the small diameter cylindrical portion 34 side of the metal sleeve 32, and one axial direction side of the cylindrical orifice member 86. The end portion (on the upper side in the axial direction) is extrapolated with respect to the pocket portion 44, and the end surface on the other side (the lower side in the axial direction) is on the upper surface of the support step 46 of the second mounting bracket 14. The cylindrical orifice member 86 is positioned between the inner peripheral surface of the holding cylindrical portion 48 of the second mounting bracket 14 and the outer peripheral surface of the small-diameter cylindrical portion 34 of the metal sleeve 32. It is clamped and held over the entire circumference, positioned and fixed in the direction perpendicular to the axis, and fixedly assembled to the second mounting bracket 14 and the metal sleeve 32.

  Further, a concave groove 88 extending in the circumferential direction by reciprocating or meandering is formed in the cylindrical orifice member 86 so as to open to the outer peripheral surface. Further, the opening of the concave groove 88 is fluid-tightly covered by the holding cylinder portion 48 of the second mounting bracket 14 that is overlapped with the outer peripheral surface of the cylindrical orifice member 86, thereby forming a tunnel-like flow path. Has been. Then, both ends of the tunnel-shaped flow path are connected to the second fluid chambers 84 through through holes (not shown) formed in the bottom wall surfaces at both end portions of the concave groove 88, so that a pair of second fluid chambers 84 are connected. A second orifice passage 90 is formed as an orifice passage that allows the fluid chambers 84 to communicate with each other. The pair of second fluid chambers 84 are always in communication with each other by the second orifice passage 90. In the present embodiment, a high damping effect is provided for low frequency vibrations such as engine shake based on the resonance action of the fluid that flows between the pair of second fluid chambers 84 through the second orifice passage 90. As obtained, the length, cross-sectional area, etc. of the second orifice passage 90 are adjusted.

  A mounting bracket 92 is fitted and fixed to the second mounting bracket 14. The mounting bracket 92 has a substantially cylindrical shape as a whole, and a stopper abutting portion 94 as an inner flange-shaped abutting portion that extends inward in the direction perpendicular to the axis is integrally formed at one end in the axial direction. In addition, a flange-like mounting flange 96 that extends outward in the direction perpendicular to the axis is formed at the end on the other side in the axial direction. In particular, in the present embodiment, the stopper contact portion 94 is formed so as to extend inward in the direction perpendicular to the axis in one direction perpendicular to the axis. Further, in the present embodiment, the mounting flange 96 has a substantially oblong disk shape, and is widened by being inclined by a predetermined amount with respect to the direction perpendicular to the axis. Further, a pair of bolt holes 98 are formed in the mounting flange 96 in one direction perpendicular to the axis, which is the major axis direction of the mounting flange 96, and the mounting bracket 92 is bolted to a vehicle body side member (not shown). Accordingly, the second mounting bracket 14 is fixed to the vehicle body side. Thus, the first mounting bracket 12 is fixed to a power unit (not shown), and the second mounting bracket 14 is fixed to a vehicle body (not shown) via the mounting bracket 92, so that the power unit is attached to the vehicle body. It is elastically connected via the engine mount 10.

  Furthermore, in the present embodiment, the bound stopper member 100 is provided so as to cover the upper part of the mounting bracket 92 in the axial direction. The bound stopper member 100 has a substantially bottomed cylindrical shape in the reverse direction, and an insertion hole 102 penetrating in the axial direction is formed at the center of the upper bottom portion. A thick abutting portion 104 extending downward is formed on the outer peripheral portion of the upper bottom portion so as to protrude downward. The thick contact portion 104 is opposed to the stopper contact portion 94 formed on the upper end portion of the mounting bracket 92 in the axial direction so as to be spaced upward by a predetermined distance. Further, a cylindrical positioning contact portion 106 that protrudes downward in the axial direction is integrally formed on the inner peripheral edge portion of the upper bottom portion. Then, such a bound stopper member 100 is assembled by inserting the first mounting bracket 12 into the insertion hole 102 formed in the upper bottom portion and externally fixing to the first mounting bracket 12. It has been. Under such an assembled state, the positioning contact portion 106 is overlapped in the axial direction in a contact state with a rebound stopper member 108 (described later) fixed to the first mounting bracket 12, thereby causing the bound stopper member 100. Is positioned in the axial direction with respect to the first mounting member 12.

  That is, a rebound stopper member 108 as a stopper member is attached to the first mounting member 12. More specifically, the rebound stopper member 108 includes an annular stopper fitting 110 as a stopper fitting. As shown in FIGS. 4 to 6, the annular stopper fitting 110 includes a main body portion having an annular shape having an inner diameter larger than the outer diameter of the large diameter portion 26 in the first mounting fitting 12. The main body portion has a substantially rectangular cross section and extends over the entire circumference. The annular stopper fitting 110 is made of a hard metal material such as an aluminum alloy, a resin material, or the like.

  The upper surface of the annular stopper fitting 110 is a substantially flat surface extending in the direction perpendicular to the axis. The upper surface forms a contact surface 112 that faces the stopper contact portion 94 in the axial direction.

  Further, in the portion of the annular stopper metal 110 that is opposed in one radial direction, an abutment support portion 113 that protrudes inward in the direction perpendicular to the axis is integrally formed at the upper portion in the axial direction of the inner peripheral surface. As a result, the inner circumferential surface of the annular stopper fitting 110 has a circular lower portion in the axial direction, but has a substantially oval upper portion in the axial direction. The substantially oval upper inner peripheral surface of the annular stopper fitting 110 has a shape corresponding to the cross-sectional shape of the attachment portion 18 of the first attachment fitting 12, and as a whole, is more than the outer peripheral surface shape of the attachment portion 18. The inner peripheral surface shape is one size larger.

  Further, since the contact support portion 113 protrudes from the inner peripheral surface of the annular stopper fitting 110, an engagement surface 114 is formed by the lower surface of the contact support portion 113. That is, the engaging surface 114 is formed in a flat surface shape that extends in a direction substantially perpendicular to the axis at an axially intermediate portion of the annular stopper fitting 110. In particular, in the present embodiment, as is apparent from the longitudinal sectional view shown in the drawing, the inner peripheral edge and the outer peripheral edge of the engaging surface 114 are each smoothly and roundly shaped in the lower part of the annular stopper fitting 110. The peripheral surface is connected to the upper inner peripheral surface (the protruding tip surface of the contact support portion 113). Furthermore, the inner peripheral surface of the annular stopper fitting 110 is smoothly connected to both axial end faces of the annular stopper fitting 110 with a rounded cross section at both axial ends. In addition, the intervening rubber 117 described later spreads in a substantially constant thickness dimension on the entire inner peripheral surface of the annular stopper metal fitting 110 including the engaging surface 114 and having a smooth sectional shape as a whole. It is attached.

  Further, the annular stopper fitting 110 is covered with a rubber elastic body 115 on the entire surface thereof. The adherend rubber elastic body 115 includes a cylindrical fitting rubber 116 as a press-fitting rubber, an intervening rubber 117, and a buffer rubber 118.

  The cylindrical fitting rubber 116 is formed so as to protrude upward in the axial direction from the inner peripheral edge portion of the upper end surface in the axial direction of the annular stopper 110 on which the contact support portion 113 is formed. The cylindrical fitting rubber 116 is set to have a wall thickness dimension and an inner and outer diameter dimension so that a sufficient fitting fixing force can be exerted on the first mounting member 12. Specifically, the cylindrical fitting rubber 116 has an inner peripheral surface shape that is slightly smaller than the inner peripheral surface shape of the annular stopper fitting 110 on which the contact support portion 113 is formed.

  Furthermore, the inner peripheral surface shape of the cylindrical fitting rubber 116 is an inner peripheral surface shape that is slightly smaller than the outer peripheral surface shape of the mounting portion 18 in the first mounting bracket 12 to which the cylindrical fitting rubber 116 is fitted and fixed. Yes. However, as will be described later, in order to obtain an effective press-fit fixing force, the inner diameter dimension Da of the cylindrical fitting rubber 116 in the small diameter direction (left and right direction in FIG. 4) and the outer diameter of the mounting portion 18 in the small diameter direction. Size: Difference from Da ′: Compared to the value of the difference of Da−Da ′, the inner diameter size: Db of the cylindrical fitting rubber 116 in the large-diameter direction (left-right direction in FIG. 5) and the mounting portion 18 It is desirable that the outer diameter dimension in the large diameter direction: difference from Db ′: the difference value of Db−Db ′ is set large as a negative value. The value of Da−Da ′ may be 0 or a positive value.

  As shown in FIG. 5, in this embodiment, the inner peripheral surface of the cylindrical fitting rubber 116 is more axial than the inner peripheral surface of the interposed rubber 122 described later in the major axis direction of the annular stopper fitting 110. It protrudes slightly inward in the perpendicular direction. As a result, the intervention rubber 122 is set so that an effective fitting and fixing force is not exerted on the first fitting 12, and the cylindrical fitting rubber 116 has the first fitting. 12, an effective fitting and fixing force is exhibited. Further, as apparent from the above description, the inner peripheral surface of the cylindrical fitting rubber 116 has a substantially long cylindrical shape.

  The intervening rubber 117 includes a support rubber 120 and an interposed rubber 122. The support rubber 120 is formed so as to cover substantially the entire surface of the engagement surface 114. Further, the interposed rubber 122 is formed on the inner peripheral surface of the annular stopper fitting 110. The support rubber 120 and the interposed rubber 122 are integrally formed to constitute the interposed rubber 117 in the present embodiment, and the interposed rubber 117 is formed integrally with the cylindrical fitting rubber 116. The support rubber 120 and the interposed rubber 122 are smoothly connected as a whole without having a recognizable boundary, and are attached to the annular stopper metal 110 with substantially the same thickness.

  Further, the buffer rubber 118 is formed so as to cover the upper surface (the contact surface 112) in the axial direction of the annular stopper fitting 110. The buffer rubber 118 is a rubber layer having an appropriate thickness, and is integrally formed with the cylindrical fitting rubber 116 and the intervening rubber 117 to constitute the adhered rubber elastic body 115. In the present embodiment, the thickness dimension is substantially constant over the entire surface, and extends over the entire outer peripheral side of the cylindrical fitting rubber 116 on the upper end surface in the axial direction of the annular stopper fitting 110.

  Then, the rebound stopper member 108 is removed from the first mounting bracket 12 by pressing the cylindrical fitting rubber 116 constituting the rebound stopper member 108 into the mounting portion 18 of the first mounting bracket 12. It is installed in the inserted state.

  More specifically, the inner diameter dimension of the cylindrical fitting rubber 116 is smaller than the outer diameter dimension of the mounting part 18 in the major axis direction of the mounting part 18, and is cylindrical in the minor axis direction of the mounting part 18. The inner diameter dimension of the fitting rubber 116 is equal to or larger than the outer diameter dimension of the mounting portion 18. Thereby, in this embodiment, while the contact force with respect to the 1st attachment metal fitting 12 is made to act in the direction orthogonal to an axis in the major axis direction of cylindrical fitting rubber 116, the first attachment metal fitting is made in the direction perpendicular to the axis in the minor axis direction. 12 is in a contact state with zero touch where the contact force with respect to 12 is substantially zero (closely overlapped state). As described above, in the minor axis direction of the cylindrical fitting rubber 116, an extrapolation state in which a gap is formed between the inner peripheral surface of the cylindrical fitting rubber 116 and the outer peripheral surface of the first mounting member 12. Alternatively, the inner peripheral surface of the cylindrical fitting rubber 116 may be pressed against the outer peripheral surface of the first mounting member 12.

  Further, in the present embodiment, the annular stopper fitting 110 has the engagement surface 114 of the abutment support portion 113 of the first attachment fitting 12 under the assembled state of the rebound stopper member 108 with respect to the first attachment fitting 12. The stepped surface 30 is positioned so as to overlap in the axial direction. A support rubber 120 is interposed between the overlapping surfaces of the engagement surface 114 and the step surface 30.

  Further, in the inner peripheral edge portion and the outer peripheral edge portion of the engagement surface 114 in the annular stopper metal fitting 110, the regions that are smoothly connected to the lower inner peripheral surface and the upper inner peripheral surface via the cross-sectional rounded surface are both the first mounting metal fittings. In FIG. 12, it is opposed to a smoothly continuous stepped portion formed between the mounting portion 18 and the fixing portion 20 with a predetermined distance therebetween. And between the opposing surfaces of these annular stopper metal fittings 110 and the first mounting metal fittings 12, not only between the opposing surfaces of the engaging surface 114 and the step surface 30, but also on both sides in the axial direction with respect to the opposing surfaces. The intervening rubber 117 is interposed in a filling manner over the region to be operated. That is, the intervening rubber 117 substantially spans between the axial facing surfaces of the annular stopper metal fitting 110 and the first mounting metal fitting 12 and between the axial perpendicular facing surfaces that are continuous on both inner and outer peripheral sides. It is interposed in a close contact state with no gap.

  In this way, a specific smooth opposing surface shape on the engaging surface 114 of the annular stopper metal 110 and the stepped surface 30 of the first mounting metal 12, and the rubber elasticity by the interposed rubber 117 interposed between the opposing surfaces. By the body layer, a dispersing action of a stopper load described later can be expressed.

  The interposed rubber 122 formed on the inner peripheral surface of the annular stopper metal 110 and interposed between the annular stopper metal 110 and the first mounting metal 12 in the direction perpendicular to the axis is the first mounting metal 12. The contact state with zero touch is substantially zero. Note that the interposed rubber 122 may be in an extrapolated state having a gap with the outer peripheral surface of the first mounting member 12.

  Further, the engagement surface 114 formed on the lower surface of the contact support portion 113 is superimposed on the step surface 30 formed on the first mounting bracket 12 from above in the axial direction via the support rubber 120. Yes. Thereby, the rebound stopper member 108 is positioned and fixed in the axial direction with respect to the first mounting member 12. In the present embodiment, the lower end surface of the positioning contact portion 106 of the bound stopper member 100 is overlapped with the upper end surface of the cylindrical fitting rubber 116 in the axial direction.

  Further, particularly in the present embodiment, the main rubber elastic body 16 gradually increases in the axial dimension from the first mounting bracket 12 side (inner axis perpendicular direction) to the metal sleeve 32 side (inner axis perpendicular direction). And the upper end surface in the axial direction of the main rubber elastic body 16 is an inclined surface that is gradually inclined upward in the axial direction outward in the direction perpendicular to the axial direction. A concave space is formed in the upper portion of the metal sleeve 32 at the upper side in the direction perpendicular to the axis. In the present embodiment, a part (lower part) of the rebound stopper member 108 attached to the first mounting member 12 in an extrapolated state is formed in the concave shape formed in the axially upper direction of the main rubber elastic body 16. It is located in the void.

  Furthermore, in the assembled state of the rebound stopper member 108 with respect to the first mounting bracket 12, the contact surface 112 is opposed to the axial lower surface of the stopper contact portion 94 by a predetermined distance in the axial direction. ing.

  In the engine mount 10 for automobiles having the above-described structure, the vertical mounting direction (in FIG. 1, the vertical direction) between the first mounting bracket 12 and the second mounting bracket 14 when mounted on the vehicle. ), When a low frequency large amplitude vibration is input, a relative pressure difference is generated between the pressure receiving chamber 64 and the equilibrium chamber 66. The pressure difference causes a positive fluid flow between the pressure receiving chamber 64 and the equilibrium chamber 66 through the first orifice passage 72, and a high damping effect is exhibited based on the resonance action of the flowing fluid. It has come to be.

  On the other hand, when the low-frequency vibration in the substantially horizontal direction (left and right direction in FIG. 1) is input between the first mounting bracket 12 and the second mounting bracket 14 under the vehicle mounting state of the engine mount 10, A relative pressure difference is generated between the second fluid chambers 84 and 84, and a fluid flow through the second orifice passage 90 is generated based on the pressure difference. The anti-vibration effect based on the above is effectively exhibited.

  Here, there is an input of large amplitude vibration between the first mounting bracket 12 and the second mounting bracket 14, so that the first mounting bracket 12 and the second mounting bracket 14 approach each other in the axial direction. When the relative displacement is performed, the lower surface of the thick contact portion 104 of the bound stopper member 100 is moved closer to the upper surface of the stopper contact portion 94 of the mounting bracket 92 in the axial direction. When the relative axial displacement amount between the bound stopper member 100 and the mounting bracket 92 is larger than the clearance between the facing surfaces of the contact surface 112 and the lower surface of the stopper contact portion 94, the thickened The lower surface of the contact portion 104 and the upper surface of the stopper contact portion 94 are brought into contact with each other. Thus, the first mounting bracket 12 and the second mounting bracket 14 are brought into contact with each other by the contact between the bound stopper member 100 assembled to the first mounting bracket 12 and the mounting bracket 92 assembled to the second mounting bracket 14. The amount of relative displacement in the approach direction in the axial direction can be limited in a buffering manner, and includes the bound stopper member 100 and the mounting bracket 92 (stopper contact portion 94). The mechanism is configured.

  On the other hand, vibration is input between the first mounting bracket 12 and the second mounting bracket 14 so that the first mounting bracket 12 and the second mounting bracket 14 are displaced relative to each other in the axial direction. As a result, the contact surface 112 of the rebound stopper member 108 is brought closer to the lower surface of the stopper contact portion 94 of the mounting bracket 92. When the relative axial displacement amount between the rebound stopper member 108 and the mounting bracket 92 is larger than the clearance between the opposing surfaces of the contact surface 112 and the lower surface of the stopper contact portion 94, the contact surface 112. And the lower surface of the stopper abutting portion 94 are abutted in the axial direction. Thereby, the first mounting bracket 12 and the second mounting bracket 14 are brought into contact with the rebound stopper member 108 assembled to the first mounting bracket 12 and the mounting bracket 92 assembled to the second mounting bracket 14. The rebound stopper mechanism in this embodiment is configured including the rebound stopper member 108 and the mounting bracket 92 (stopper contact portion 94). Yes.

  In the engine mount 10 having the structure according to this embodiment, the rebound stopper member 108 is mounted on the first mounting bracket 12 by press-fitting the cylindrical fitting rubber 116 into the mounting portion 18. Yes. The cylindrical fitting rubber 116 is formed of a rubber elastic body and protrudes from the inner peripheral edge of the annular stopper fitting 110 in the axially upper end surface toward the axially upward direction. The elastic diameter expansion deformation accompanying this is allowed. This eliminates the need to press-fit the annular stopper fitting 110 with respect to the first attachment fitting 12, and causes a dimensional error between the outer diameter dimension of the first attachment fitting 12 and the inner diameter dimension of the annular stopper fitting 110. Therefore, the rebound stopper member 108 can be stably press-fitted and fixed to the first mounting member 12.

  In particular, when a press-fitting member formed of a relatively soft metal such as aluminum is used as a member to be press-fitted and fixed (the first mounting bracket 12 and the annular stopper bracket 110), Problems such as deformation and breakage due to dimensional errors of the press-fitting member are likely to be a problem. However, in the engine mount 10, the rebound stopper member 108 is attached to the first mounting bracket 12 by press-fitting a cylindrical fitting rubber 116 formed of a rubber material and made elastically deformable into the mounting portion 18. Even if the first mounting bracket 12 and the annular stopper bracket 110 are formed of a relatively soft metal material that may be deformed or damaged by the action of external force, Damage and deformation due to action can be effectively avoided.

  Furthermore, in the present embodiment, the cylindrical fitting rubber 116 that is press-fitted and fixed to the first mounting member 12 is provided so as to protrude upward in the axial direction from the annular stopper member 110 so that the diameter expansion deformation is allowed. On the other hand, the inner rubber 122 formed on the inner peripheral surface of the annular stopper fitting 110 has an inner circumference of the annular stopper fitting 110 in a zero touch state in which substantially no contact force is applied to the first attachment fitting 12. It is interposed between the opposing surfaces in the direction perpendicular to the axis between the surface and the outer peripheral surface of the first mounting member 12. As a result, when the rebound stopper member 108 is press-fitted and fixed to the first mounting member 12, the rebound stopper member by the spring back caused by the elastic deformation of the rubber elastic body (cylindrical fitting rubber 116, interposed rubber 122). 108 can be advantageously reduced or avoided, and the rebound stopper member 108 is assembled to the first mounting bracket 12 at a target position with high accuracy. Can be.

  In addition, the engagement surface 114 of the annular stopper fitting 110 (abutment support portion 113) is overlapped with the stepped surface 30 of the first mounting fitting 12 in the axial direction via the cushioning rubber 118, and abuts. I'm hurt. As a result, the first mounting bracket 12 and the second mounting bracket 14 are relatively displaced in a direction away from each other, and the contact surface 112 of the rebound stopper member 108 and the stopper contact portion 94 of the mounting bracket 92 are axially moved. Even when a downward load in the axial direction accompanying the contact is applied to the rebound stopper member 108, the stepped surface 30 of the first mounting bracket 12 is spread over a wide range via the buffer rubber 118. Since the load can be shared, excellent load resistance can be achieved. In particular, in the present embodiment, the bump rubber 30 is interposed between the axially opposed surfaces of the step surface 30 of the first mounting member 12 and the engaging surface 114 of the annular stopper member 110, whereby the step surface 30 and the mounting portion 18 are disposed. The load in the axial direction can be shared and supported also on the curved portion formed at the boundary portion of the step surface 30 or the boundary portion between the stepped surface 30 and the fixing portion 20, and the load resistance is advantageously increased by the dispersing action of the stopper load. It is possible to improve the performance.

  In addition, in the present embodiment, the first mounting bracket 12 in which the overlapping portion in the axial direction of the engagement surface 114 and the stepped surface 30 is located in a state where the rebound stopper member 108 is attached to the first mounting bracket 12. In the minor axis direction, the contact surface 112 of the rebound stopper member 108 and the lower surface of the stopper contact portion 94 of the mounting bracket 92 are opposed to each other in the axial direction, but the engagement surface 114 and the step surface 30 are not formed. In the major axis direction of the first mounting bracket 12, the abutting surface 112 of the rebound stopper member 108 and the lower surface of the stopper abutting portion 94 of the mounting bracket 92 are formed at positions shifted in the axial projection and opposed in the axial direction. It is designed not to be squeezed. As a result, the axial load caused by the contact between the contact surface 112 and the lower surface of the stopper contact portion 94 in the axial direction mainly acts on both sides in the short diameter direction, which is particularly excellent in load resistance, and the engagement surface 114 The excellent load bearing performance obtained by overlapping the stepped surface 30 via the buffer rubber 118 can be exhibited more effectively.

  In the present embodiment, the mounting portion 18 of the first mounting bracket 12 is formed to extend in the axial direction with a substantially constant oval cross section, and is a cylindrical fitting rubber that is externally fitted to the mounting portion 18. 116 has an oval shape substantially corresponding to the cross-sectional shape of the mounting portion 18, and a press-fitting allowance is provided in the major axis direction of the cylindrical fitting rubber 116 so that the abutting force of the cylindrical fitting rubber 116 with respect to the mounting portion 18 On the other hand, the abutting force against the mounting portion 18 is not allowed to act in the minor axis direction of the cylindrical fitting rubber 116. As a result, the amount of elastic deformation of the cylindrical fitting rubber 116 can be reduced compared to the case where the cylindrical fitting rubber 116 is expanded over the entire circumference by press-fitting the first fitting 12. Thus, the durability of the cylindrical fitting rubber 116 can be improved.

  Next, FIG. 7 shows an automobile engine mount 124 as a second embodiment of the present invention. In the engine mount 124, a first mounting bracket 126 as a first mounting member includes a substantially cylindrical mounting portion 128 and a substantially cylindrical fixing portion 20 having a larger diameter than the mounting portion 128. have. In the following description, members or portions that are substantially the same as those in the first embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.

  More specifically, the mounting portion 128 in the present embodiment has a circular rod shape extending in the axial direction with a substantially constant circular cross section, and a mounting bolt 130 is formed at the upper end in the axial direction. The mounting bolt 130 is fixed to a member on the power unit side of the automobile (not shown), and the first mounting bracket 126 is attached to the power unit, while the second mounting bracket 14 is attached to the body of the automobile. Is supported on a body (not shown) in an anti-vibration manner.

  Further, the fixing portion 20 has a cylindrical shape larger in diameter than the attachment portion 128, and a step surface 132 is continuously formed over the entire circumference at the boundary between the attachment portion 128 and the fixing portion 20. .

  Further, in the present embodiment, as described above, since the shape of the attachment portion 128 in the first attachment fitting 126 is a cylindrical shape, the rebound stopper member 134 that is externally inserted into the attachment portion 128 is generally a ring. It is made into a shape. In addition, the annular stopper fitting 136 constituting the rebound stopper member 134 has a substantially annular shape extending with a constant cross-sectional shape over substantially the entire circumference. That is, in the annular stopper fitting 136 in the present embodiment, the contact support portion 138 that extends inward in the direction perpendicular to the axis is formed continuously over the entire circumference. Further, an engagement surface 140 is formed on the lower surface of the contact support portion 138 over the entire circumference, and the engagement surface 140 is brought into contact with the stepped surface 132 via the cushioning rubber 118 so that the rebound stopper member. 134 is fixed to the first mounting member 126 in the axial direction. Further, the cylindrical fitting rubber 142 formed so as to extend upward in the axial direction from the upper surface of the inner peripheral edge portion of the annular stopper fitting 136 has an inner diameter dimension over the entire circumference of the mounting section 128. In the assembled state of the rebound stopper member 134 with respect to the first mounting bracket 126, the cylindrical fitting rubber 142 is pressed against the mounting portion 128 of the first mounting bracket 126 over the entire circumference. I'm hurt. Thereby, the rebound stopper member 134 in this embodiment is fixedly assembled to the first mounting bracket 126.

  Also in the engine mount 124 having the structure according to this embodiment, the same effect as that exhibited in the engine mount 10 according to the first embodiment can be effectively obtained.

  In particular, in the present embodiment, the mounting portion 128 of the first mounting bracket 12 is formed to extend in the axial direction with a substantially constant circular cross-sectional shape, and at the boundary between the mounting portion 128 and the fixing portion 20. While the step surface 132 is continuously formed over the entire circumference, the contact support portion 138 that protrudes inward in the direction perpendicular to the axis from the upper portion of the inner peripheral surface of the annular stopper fitting 136 in the rebound stopper member 134 is provided. The engagement surface 140 is continuously formed on the lower surface of the abutting support portion 138 and is continuously formed over the entire circumference. Are overlapped in the axial direction. Therefore, the overlapping area of the engagement surface 140 with respect to the stepped surface 132 can be increased, and a rebound stopper mechanism having a further excellent load resistance performance in the axial direction can be realized.

  Moreover, in this embodiment, the contact surface 112 of the rebound stopper member 134 and the lower surface of the stopper contact portion 94 of the mounting bracket 92 are opposed to each other in the axial direction over the entire circumference. As a result, a large overlapping area can be obtained in the axial projection between the contact surface 112 of the rebound stopper member 134 and the lower surface of the stopper contact portion 94 of the mounting bracket 92. The contact force with the lower surface of the contact portion 94 can be shared and supported in a wide range, and damage to the contact surface 112 (buffer rubber 118) due to stress concentration can be avoided.

  As mentioned above, although one Embodiment of this invention has been described, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this Embodiment.

  For example, in the first and second embodiments, the fluid-filled automobile engine mounts 10 and 124 are shown as an example of the vibration isolator having the structure according to the present invention. Of course, it can be suitably used for various types of vibration isolation devices. In addition, the present invention is not limited to a fluid-filled vibration isolator, but the first mounting bracket and the second mounting bracket are connected by a main rubber elastic body, and the vibration isolating effect is achieved by elastic deformation of the main rubber elastic body. It can also be applied to a solid-type vibration isolator in which

  Further, in the first and second embodiments, the stopper abutting portion 94 constituting the rebound stopper mechanism is formed using the upper end portion of the mounting bracket 92 that is fitted and fixed to the second mounting bracket 14. However, the stopper contact portion only needs to be provided on the second mounting bracket 14, and it is not always necessary to use a part of the mounting bracket 92. Specifically, for example, a stopper contact portion that extends inward in the direction perpendicular to the axis is formed integrally with the second mounting bracket at the upper end portion in the axial direction of the second mounting bracket, The rebound stopper member mounted on the mounting bracket may be spaced apart and opposed in the axial direction, or the stopper may be a member formed separately from the second mounting bracket and the mounting bracket. You may comprise a contact part.

  Further, in the first embodiment, in order to increase the load resistance in the axial direction, the contact of the rebound stopper member 108 in the direction perpendicular to the axis where the stepped surface 30 and the engaging surface 114 are superposed is realized. The surface 112 and the lower surface of the stopper abutting portion 94 of the mounting bracket 92 are opposed to each other in the axial direction to form a rebound stopper mechanism, and the step perpendicular to the axis surface where the step surface 30 and the engagement surface 114 are not overlapped. In the direction, the rebound stopper mechanism is not configured. However, it is a matter of course that the rebound stopper mechanism is configured also in the direction perpendicular to the axis where the engagement surface 114 of the rebound stopper member 108 and the stepped surface 30 of the first mounting bracket 12 are not overlapped in the axial direction. Is possible.

  In the first and second embodiments, the surface of the annular stopper fitting 110 (136) constituting the rebound stopper member 108 (134) is covered by the adherend rubber elastic body 115 over substantially the entire surface. However, the surface of the annular stopper fitting 110 (136) does not necessarily have to be entirely covered with the rubber elastic body, and a part of the annular stopper fitting 110 (136) may be exposed to the outside.

  Further, in the first and second embodiments, the relative displacement in the axial direction of the first mounting bracket 12 (126) and the second mounting bracket 14 is limited by the bound stopper mechanism and the rebound stopper mechanism. In addition to this, in addition to this, it is also possible to configure a shaft straight stopper mechanism that limits the relative displacement amount of the first mounting bracket 12 (126) and the second mounting bracket 14 in the direction perpendicular to the axis. Is possible. In particular, it may be possible to configure such an axial stopper mechanism by skillfully using the rebound stopper member 108 (134). Specifically, for example, a shock absorbing rubber is formed on the outer peripheral surface of the rebound stopper member, a contact surface is formed on the outer peripheral surface, and the rebound stopper member is perpendicular to the axis at the time of excessive vibration in the direction perpendicular to the axis. By providing the second mounting bracket with a stopper abutting portion that is brought into contact with the first mounting bracket 12, the relative displacement in the direction perpendicular to the axis of the first mounting bracket 12 (126) and the second mounting bracket 14 is buffered. It is also possible to configure a straight shaft stopper mechanism.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is a longitudinal cross-sectional view which shows the engine mount for motor vehicles as 1st embodiment of this invention, Comprising: It is a figure equivalent to the II cross section in FIG. It is a longitudinal cross-sectional view which shows the engine mount for motor vehicles shown by FIG. 1, Comprising: It is a figure equivalent to the II-II cross section in FIG. FIG. 3 is a transverse sectional view showing the automobile engine mount shown in FIG. 1, corresponding to a section taken along line III-III in FIG. 1. It is a longitudinal cross-sectional enlarged view which shows the principal part of the engine mount for motor vehicles shown by FIG. 1, Comprising: It is a figure corresponded in the IV-IV cross section in FIG. It is a longitudinal cross-sectional enlarged view which shows the principal part of the engine mount for motor vehicles shown by FIG. 1, Comprising: It is a figure equivalent to the VV cross section in FIG. It is a plane enlarged view which shows the principal part of the engine mount for motor vehicles shown by FIG. It is a longitudinal cross-sectional view which shows the engine mount for motor vehicles as 2nd embodiment of this invention.

Explanation of symbols

10 automotive engine mount 12 first mounting bracket 14 second mounting bracket 16 rubber elastic body 94 stopper contact portion 108 rebound stopper member 110 annular stopper bracket 112 contact surface 113 contact support portion 114 engagement surface 115 covered Rubberized elastic body 116 Cylindrical fitting rubber 117 Intervening rubber 118 Buffer rubber

Claims (4)

The first mounting member is arranged to enter the axial direction on the central axis from one opening in the axial direction of the second mounting member having a cylindrical shape, and is arranged at a predetermined distance in the direction perpendicular to the axis. In the vibration isolator that connects the mounting member and the second mounting member in the direction perpendicular to the axis with the main rubber elastic body,
While providing a stepped stopper receiving surface at a portion protruding from the main rubber elastic body in the first mounting member, an annular stopper metal fitting that is extrapolated to the first mounting member is adopted, A stepped engagement surface is formed on the inner peripheral surface so as to overlap the stopper receiving surface in the axial direction, and a rubber elastic body to be adhered is fixed to the surface of the stopper fitting, and (i) the stopper fitting A cylindrical press-fit rubber projecting from the inner peripheral edge toward one side in the axial direction; (ii) an intermediate rubber covering the inner peripheral surface of the stopper metal; and (iii) one end face in the axial direction of the stopper metal. A stopper rubber is formed by integrally forming a buffer rubber to be covered with the rubber elastic body to be adhered, and the stopper rubber is extrapolated from the axially projecting end side of the first mounting member, and the press-fitted rubber is Press-fit to one mounting member Thus, the press-fitted rubber extends from the stopper fitting toward the axially projecting end side of the first mounting member, and the engagement surface of the stopper fitting is brought into contact with the stopper receiving surface of the first mounting member. On the other hand, the stopper member is mounted in the state of being overlapped in the axial direction via the intervening rubber, while the stopper extends from the second mounting member to the axial direction where the first mounting member protrudes. By providing the second mounting member with an abutting portion that is located on the outer side in the axial direction of the member and is brought into contact with the stopper fitting via the cushioning rubber, An anti-vibration device comprising a rebound stopper mechanism for bufferingly limiting a relative displacement amount of the first mounting member and the second mounting member toward one side in the axial direction by contact.   The axially outer end surface of the main rubber elastic body is an inclined surface that gradually protrudes outward in the axial direction from the center in the radial direction to the axial end of the main rubber elastic body. The anti-vibration device according to claim 1, wherein a recess is formed between the first mounting member and the second mounting member facing each other in the radial direction.   On both sides of the first attachment member sandwiched in one direction perpendicular to the axis, a pair of pocket portions are formed in the outer peripheral surface of the main rubber elastic body, and the openings of the pair of pocket portions are formed in the second attachment. By covering the fluid tightly with a member, a part of the wall portion is formed of the main rubber elastic body to form a pair of working fluid chambers filled with an incompressible fluid, and the pair of working fluid chambers The vibration isolator according to claim 1 or 2, further comprising orifice passages communicating with each other. The inner peripheral surface of the press-fitted rubber has a long cylindrical shape, and the pressure input of the press-fitted rubber to the first mounting member is set larger in the larger diameter direction than in the smaller diameter direction. The vibration isolator as described in any one of.

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