JP2013170660A - Fluid sealed vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid sealed vibration control device with novel structure, capable of preventing unnecessary increase in size in the other axially orthogonal direction, while highly achieving request performance in an input direction of a major load in an axially orthogonal direction.SOLUTION: A body rubber elastic body 18 is oval when seen from a vertical axis direction, a stuck part of a second installation member 16 stuck to the main rubber elastic body 18 is oval when seen from the vertical axis direction, a free length in a long axis direction of the body rubber elastic body 18 is larger than a free length in a short axis direction. On the other hand, an installation part 104 projected sideward in the short axis direction of the body rubber elastic body 18 is disposed to an outer bracket 78 installed to the second installation member 16, the installation part 104 is attached to an oscillation source 22, an axially orthogonal stopper means is provided to restrict a relative displacement between the first installation member 14 and the second installation member 16 in the long axis direction of the body rubber elastic body 18.

Description

  The present invention relates to a vibration isolator used for, for example, an automobile engine mount, and more particularly to a fluid filled type vibration isolator utilizing a vibration isolating effect based on a fluid action of a fluid enclosed inside.

  2. Description of the Related Art Conventionally, as a type of vibration isolator that is interposed between members constituting a vibration transmission system and mutually isolates or supports these members, the anti-vibration based on the fluid action of the fluid enclosed inside is known. A fluid-filled vibration isolator using a vibration effect is known, and its application to an automobile engine mount or the like is being studied. In this fluid-filled vibration isolator, for example, as disclosed in Japanese Patent Application Laid-Open No. 11-311291 (Patent Document 1) and the like, a first mounting member and a cylindrical second mounting member are elastic on the main body. It has a structure that is elastically connected by the body. Further, a pressure receiving liquid chamber and an equilibrium liquid chamber are formed on both upper and lower sides of the partition member supported by the second mounting member, and the pressure receiving liquid chamber and the equilibrium liquid chamber are communicated with each other by an orifice passage.

  In the fluid-filled vibration isolator described in Patent Document 1, the first mounting member is disposed above the second mounting member, and the first mounting member is mounted on the vibration source side such as a power unit. At the same time, the second attachment member is attached to the vibration isolation target member side such as a vehicle body. On the other hand, in Japanese Patent No. 4755147 (Patent Document 2) and the like, the first mounting member is disposed below the second mounting member, and the first mounting member is mounted on the vibration isolation target member side. In addition, an inverted fluid-filled vibration isolator has been proposed in which the second attachment member is attached to the vibration source side.

  By the way, for example, when a fluid-filled vibration isolator is used as an engine mount, the load accompanying acceleration / deceleration is input in the longitudinal direction of the vehicle. May be.

  However, fluid-filled vibration damping devices generally exhibit substantially constant characteristics (such as vibration damping performance and durability) over the entire circumference. If the durability required in the input direction is to be realized, there is a possibility that an unnecessarily large diameter or an adverse effect on the spring characteristics may become a problem in other directions perpendicular to the axis.

Japanese Patent Laid-Open No. 11-311291 Japanese Patent No. 4755147

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that the required performance is highly realized in the input direction of the main shaft direct load, while unnecessary enlargement in the direction perpendicular to the other axis is achieved. It is an object of the present invention to provide a fluid-filled vibration isolator having a novel structure that can prevent the above-described problem.

  That is, according to the first aspect of the present invention, the first mounting member is disposed below the second mounting member that is formed in a cylindrical shape extending vertically, and the first mounting member and the second mounting member While being elastically connected by a main rubber elastic body, the first attachment member is attached to a vibration isolation target member, and the second attachment member is attached to a vibration source. A pressure receiving liquid chamber in which a part of the wall portion is formed of the main rubber elastic body is formed on one side of the partition member supported by the second mounting member, and on the other side. The fluid-filled vibration isolator is formed with an equilibrium liquid chamber in which a part of the wall portion is formed of a flexible film, and an orifice passage is formed to communicate the pressure receiving liquid chamber and the equilibrium liquid chamber with each other. The main rubber elastic body has an oval shape when viewed in the vertical axis direction. The fixing portion of the second mounting member to the main rubber elastic body is formed into an oval shape when viewed in the vertical axis direction, and the free length of the main rubber elastic body in the long axis direction is the short axis direction. The outer bracket mounted on the second mounting member includes a mounting portion that protrudes laterally in the minor axis direction of the main rubber elastic body, and the mounting portion is Along with the vibration source, there is provided a shaft straight stopper means for restricting the relative displacement between the first mounting member and the second mounting member in the major axis direction of the main rubber elastic body. It is characterized by that.

  According to the fluid-filled vibration isolator configured as described above according to the first aspect, the main rubber elastic body and the fixing portion of the main rubber elastic body in the second mounting member are both long in the vertical axis direction view. It has a circular shape. Thereby, the free length of the main rubber elastic body is ensured to be large in the long axis direction, the durability in the long axis direction is improved, and the size is reduced in the short axis direction, and interference with other members, etc. Is avoided.

  In addition, since the first attachment member is attached to the vibration isolation target member, and the second attachment member is an inverted type fluid-filled vibration-proof device attached to the vibration source, the fluid-filled vibration-proof device The center of gravity position is set biased downward. Therefore, the falling direction moment resulting from the input in the direction perpendicular to the axis is reduced, and the durability is improved and the vibration isolation performance is stabilized. In particular, since the falling moment about the short axis that tends to cause a problem due to an increase in the free length is reduced, load resistance against input in the long axis direction is sufficiently secured.

  Furthermore, the relative displacement amount in the major axis direction of the first mounting member and the second mounting member is regulated by the shaft straight stopper means. Thereby, the amount of elastic deformation of the main rubber elastic body with respect to load input in the major axis direction is limited, and the durability can be improved more effectively.

  In addition, since the mounting part of the outer bracket attached to the vibration source protrudes in the short axis direction, the free length of the main rubber elastic body is ensured in the long axis direction, while the size in the mounting direction to the vibration source is increased. It is avoided that restrictions are imposed on the installation space and the mounting structure to the vibration source in order to ensure the durability of the main rubber elastic body.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator described in the first aspect, the outer bracket is attached to a lower end portion of the second mounting member.

  According to the second aspect, since the outer bracket is disposed at the lower part of the fluid filled type vibration damping device, the upper center of gravity is prevented from being moved by the mounting of the outer bracket, and the position of the center of gravity is set downward. The improvement of the load resistance due to this is realized.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator described in the second aspect, the second mounting member has a locking piece that projects downward from a fixing portion of the main rubber elastic body. The outer bracket is attached to the second mounting member by caulking and fixing with the locking piece.

  According to the third aspect, the outer bracket can be disposed below the second mounting member by fixing the outer bracket to the locking piece of the second mounting member by caulking. In addition, since the axial dimension of the overlapping portion of the second mounting member and the outer bracket (the connecting portion by caulking) can be reduced as compared with press-fitting or the like, the center of gravity can be easily set downward, which is superior. Load resistance and the like can be realized.

  According to a fourth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to third aspects, an inner bracket is attached to the first mounting member. One attachment member is attached to the vibration isolation target member via the inner bracket, and the inner bracket is attached to the inner bracket in the major axis direction of the main rubber elastic body with respect to the second attachment member. Opposing stopper portions are provided, and the shaft straight stopper means is constituted by contact between the stopper portion and the second mounting member.

  According to the 4th aspect, an axial straight stopper means can be comprised using the inner bracket for attaching a 1st attachment member to a vibration isolator object member. Note that the inner bracket may be in direct contact with the second mounting member, or may be in indirect contact with an outer bracket, a buffer rubber, or the like.

  According to a fifth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to fourth aspects, a liquid chamber forming recess that opens upward is formed in the main rubber elastic body. The pressure chamber is formed by covering the opening of the liquid chamber forming recess with the partition member, and the diameter of the liquid chamber forming recess is longer in the longer axis direction than in the shorter axis direction. It's getting bigger.

  According to the fifth aspect, since the effective piston area of the pressure receiving liquid chamber is ensured to be large and the pressure fluctuation at the time of vibration input is efficiently induced, the vibration isolation effect based on the fluid flow action or the like is advantageous. The anti-vibration performance is improved. In addition, since the main rubber elastic body has an oval shape, partial thinning of the main rubber elastic body due to different diameters of the liquid chamber forming recesses is avoided, and the intended durability is achieved. And anti-vibration performance can be realized.

  According to the present invention, both the main rubber elastic body and the fixing portion of the main rubber elastic body in the second mounting member have an oval shape when viewed in the vertical axis direction. A large free length in the direction is secured to improve durability, and compactness is achieved in the short axis direction, and even a small installation space can be arranged without interfering with other members. . Moreover, since it is an inverted type fluid-filled vibration isolator, the center of gravity position is set downward, and the moment of collapse direction is prevented from becoming a problem even in the major axis direction where the free length of the main rubber elastic body is large. Can do. In addition, the amount of elastic deformation in the major axis direction of the main rubber elastic body is limited by the axial straight stopper means, and the durability is further improved.

The perspective view which shows the engine mount as the 1st Embodiment of this invention. The top view of the engine mount shown by FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. VV sectional drawing of FIG. The longitudinal cross-sectional view which shows the engine mount as the 2nd Embodiment of this invention. VII-VII sectional drawing of FIG. The longitudinal cross-sectional view which shows the engine mount as the 3rd Embodiment of this invention.

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

  1 to 5 show an engine mount 10 for an automobile as a first embodiment of a fluid filled type vibration damping device having a structure according to the present invention. The engine mount 10 includes a mount body 12, and the mount body 12 has a structure in which a first mounting member 14 and a second mounting member 16 are elastically connected by a main rubber elastic body 18. As shown in FIG. 3, the first attachment member 14 is attached to the vehicle body 20 as the vibration isolation target member, and the second attachment member 16 is attached to the power unit 22 as the vibration source. Thus, the power unit 22 is supported by the vehicle body 20 in a vibration-proof manner. In the following description, the vertical direction means, in principle, the vertical direction in FIG. 3 which is the vertical vertical direction when mounted on the vehicle. Further, when the engine mount 10 is mounted on the vehicle, the lower side in FIG. 2 is the front of the vehicle.

  More specifically, the first mounting member 14 is a high-rigidity member formed of a metal material such as iron or an aluminum alloy, and has a substantially circular block shape. A flange portion 24 is integrally formed. Further, the first mounting member 14 is formed with a screw hole 26 that extends on the central axis and opens to the lower surface.

  An intermediate sleeve 28 is disposed above the first attachment member 14. The intermediate sleeve 28 is a highly rigid member similar to the first mounting member 14 and has a large-diameter, generally cylindrical shape.

  The first mounting member 14 is disposed below the intermediate sleeve 28 on the same central axis, and the first mounting member 14 and the intermediate sleeve 28 are elastically connected by the main rubber elastic body 18. The main rubber elastic body 18 has a substantially frustum shape in the reverse direction. The first attachment member 14 is vulcanized and bonded to the end (lower end) on the small diameter side, and the end on the large diameter side. An intermediate sleeve 28 is vulcanized and bonded to the outer peripheral surface of the portion (upper end portion). The main rubber elastic body 18 of the present embodiment is formed as an integrally vulcanized molded product including the first mounting member 14 and the intermediate sleeve 28.

  Further, the main rubber elastic body 18 is formed with a large-diameter recess 30 as a liquid chamber forming recess. The large-diameter recess 30 is a recess having a substantially mortar shape, and is open to the end surface (upper end surface) on the large-diameter side of the main rubber elastic body 18.

  A flexible film 32 is attached to the integrally vulcanized molded product of the main rubber elastic body 18. The flexible membrane 32 is a thin rubber elastic body and has sufficient slackness in the vertical direction. Further, a cylindrical sealing rubber layer 34 is integrally formed on the outer peripheral side of the flexible film 32, and this sealing rubber layer 34 is vulcanized and bonded to the outer cylindrical member 36.

  The outer cylinder member 36 is a highly rigid member like the intermediate sleeve 28, and has a thin cylindrical shape with a large diameter as a whole. Further, an annular stepped portion 38 is provided in the axially intermediate portion of the outer tubular member 36, the upper portion being a small diameter tubular portion 40 across the stepped portion 38, and the lower portion being a large diameter tubular portion. Has been.

  Furthermore, a flange-shaped positioning portion 44 protrudes from the lower end of the large-diameter cylindrical portion 42 to the outer peripheral side, and a locking piece 46 extends downward from the outer peripheral end portion of the positioning portion 44. In addition, the positioning part 44 has a small projecting dimension toward the outer peripheral side at a part of the periphery, and the locking piece 46 is not formed at the part. In other words, the locking piece 46 is formed with a length that is less than one round in the circumferential direction, and has a notch 48 in a part of the circumference.

  The seal rubber layer 34 is fixed so as to cover the inner peripheral surface of the small-diameter cylindrical portion 40 of the outer cylindrical member 36, and the opening above the outer cylindrical member 36 is covered with the flexible film 32.

  Further, the large-diameter cylindrical portion 42 of the outer cylindrical member 36 is externally fixed to the intermediate sleeve 28 by being subjected to diameter reduction processing such as eight-way drawing after being extrapolated to the intermediate sleeve 28. Thereby, the second mounting member 16 of the present embodiment is configured to include the intermediate sleeve 28 and the outer cylinder member 36. In the second mounting member 16, the locking piece 46 of the outer cylinder member 36 projects downward from the intermediate sleeve 28 that is a fixed portion to the main rubber elastic body 18.

  Further, the flexible film 32 is disposed to face the main rubber elastic body 18 so as to be spaced upward, and between the main rubber elastic body 18 and the flexible film 32 in the axial direction, there is no external space. On the other hand, a fluid chamber 50 is formed which is sealed and sealed with an incompressible fluid. Note that the incompressible fluid sealed in the fluid chamber 50 is not particularly limited, and for example, water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof is suitably employed. The Furthermore, a low-viscosity fluid having a viscosity of 0.1 Pa · s or less is desirable in order to efficiently obtain a vibration isolation effect based on the fluid flow action described later.

  A partition member 52 is disposed in the fluid chamber 50. The partition member 52 has a thick plate shape and includes a partition member main body 54 and a lid member 56.

  The partition member main body 54 is a hard member formed of a synthetic resin, metal, or the like, and has a thick plate shape as a whole, and the outer peripheral portion is thicker than the inner peripheral portion and is downward. Protruding. In addition, a housing recess 57 that opens upward is formed in the inner peripheral portion that is thin. Furthermore, a circumferential groove 58 extending in a circumferential spiral shape with a length of a little less than two rounds is formed in the outer circumferential portion that is thick and open on the outer circumferential surface.

  The lid member 56 is a hard member similar to the partition member main body 54 and has a thin plate shape. In this embodiment, the inner peripheral portion is thicker than the outer peripheral portion and protrudes downward. Yes.

  The lid member 56 is superimposed on the upper surface of the partition member main body 54. Thereby, the opening of the accommodation recess 57 is covered with the lid member 56, and the accommodation space 60 is formed between the partition member main body 54 and the lid member 56. A movable film 62 is accommodated in the accommodation space 60. The movable film 62 is a plate-like rubber elastic body, and a thick sandwiching portion 64 that protrudes on both sides in the thickness direction is provided at the outer peripheral end portion. The movable film 62 is disposed in the accommodation space 60, and the thick sandwiching portion 64 is sandwiched between the axially opposed surfaces of the partition member main body 54 and the lid member 56, and the inner peripheral portion is thick. Small elastic deformation in the direction is allowed.

  The partition member 52 having such a structure is disposed in the fluid chamber 50. That is, the partition member 52 is inserted into the small-diameter cylindrical portion 40 of the second mounting member 16, and is supported by the second mounting member 16 by reducing the diameter of the small-diameter cylindrical portion 40, so that it is substantially perpendicular to the axis. Has spread.

  In addition, the fluid chamber 50 is divided into two vertically by sandwiching the partition member 52 by the arrangement of the partition member 52. As a result, a part of the wall portion is formed of the main rubber elastic body 18 below the partition member 52, and a pressure receiving liquid chamber 66 is formed in which an internal pressure fluctuation is caused when vibration is input. On the other hand, above the partition member 52, a part of the wall portion is formed of the flexible film 32, and an equilibrium liquid chamber 68 in which volume change is easily allowed is formed. In other words, when the opening of the large-diameter recess 30 is covered with the partition member 52, a pressure receiving liquid chamber 66 is formed between the main rubber elastic body 18 and the partition member 52, and the small-diameter cylindrical portion 40 By covering the lower opening with the partition member 52, an equilibrium liquid chamber 68 is formed between the flexible film 32 and the partition member 52. The pressure receiving liquid chamber 66 and the equilibrium liquid chamber 68 are filled with an incompressible fluid.

  Further, the outer peripheral surface of the partition member 52 is brought into close contact with the second mounting member 16 via the seal rubber layer 34, so that the outer peripheral opening of the peripheral groove 58 is covered fluid-tightly by the second mounting member 16, A tunnel-like flow path extending in the circumferential direction is formed. One end of the tunnel-shaped flow path communicates with the pressure receiving liquid chamber 66 through the first communication hole 69, and the other end communicates with the equilibrium liquid chamber 68 through the second communication hole (not shown). Thus, an orifice passage 70 is formed to communicate the pressure receiving liquid chamber 66 and the equilibrium liquid chamber 68 with each other. In the orifice passage 70, the resonance frequency (tuning frequency) of the flowing fluid is set by adjusting the ratio (A / L) between the passage sectional area (A) and the passage length (L). In the form, it is set to a low frequency of about 10 Hz corresponding to engine shake or the like.

  In addition, a first through hole 72 is formed in the lower wall portion of the accommodation space 60 so that the pressure of the pressure receiving liquid chamber 66 is exerted on the lower surface of the movable film 62, and the upper wall portion of the accommodation space 60. A second through hole 74 is formed through the upper surface of the movable film 62 so that the fluid pressure of the equilibrium liquid chamber 68 is exerted on the upper surface of the movable film 62. Thereby, the movable film 62 is elastically deformed in the thickness direction based on the relative pressure difference between the pressure receiving liquid chamber 66 and the equilibrium liquid chamber 68, and the liquid pressure in the pressure receiving liquid chamber 66 is changed to the equilibrium liquid chamber. The internal pressure fluctuation of the pressure receiving liquid chamber 66 is absorbed by the volume change of the equilibrium liquid chamber 68.

  An inner bracket 76 and an outer bracket 78 are attached to the mount body 12 having such a structure.

  The inner bracket 76 is a high-rigidity member formed of metal or the like, and includes a connecting plate 80 fixed to the first mounting member 14, a pair of stopper portions 82 and 82 supported by the connecting plate 80, A bounce contact portion 84 supported by the pair of stopper portions 82, 82.

  The connecting plate 80 is a highly rigid member having a substantially rectangular plate shape when viewed in the vertical axis direction. Bolt holes 86 are formed through the central portion and both end portions in the longitudinal direction (left-right direction in FIG. 4). ing. In addition, the connection plate 80 of this embodiment is made into the stepped shape in which the center part of a longitudinal direction is located above both ends.

  The pair of stopper portions 82, 82 are arranged to face each other in the longitudinal direction of the connection plate 80 and are fixed to the longitudinal ends of the connection plate 80. The stopper portion 82 is superimposed on the upper surface of the connecting plate 80 and fixed to the lower end support portion 88 by welding or the like, and upward from the inner ends in the opposing direction of the pair of stopper portions 82 and 82 in the lower end support portion 88. The shaft direct contact portion 90 that protrudes toward the center and the rebound contact portion 92 that protrudes inward in the opposite direction from the upper end of the shaft direct contact portion 90 are integrally provided. Further, the stopper portion 82 has thicknesses on the outer side in the thickness direction of the stopper portion 82 (lower end support portion 88, shaft direct contact portion 90, and rebound contact portion) at both end portions in the width direction (left and right direction in FIG. 2). Reinforcing ribs 94 projecting outward (in the vertical direction) are integrally formed, and rigidity is improved in the shaft direct contact portion 90 and the rebound contact portion 92 each having a plate shape. A bolt hole 96 is formed in the lower end support portion 88 so as to penetrate vertically and is positioned with the bolt hole 86 of the connecting plate 80.

  The bounce contact portion 84 as a whole has a plate shape extending in the longitudinal direction of the connecting plate 80 in a direction substantially perpendicular to the axis, and both end portions in the longitudinal direction are overlapped with one end surface in the width direction of the pair of stopper portions 82 and 82. It is fixed by means such as welding. Further, the bounce contact portion 84 is reinforced by bending both end portions in the longitudinal direction in the thickness direction and extending downward, thereby improving load resistance. In addition, the dimension of the width direction (left-right direction in FIG. 3) of the bound contact part 84 of this embodiment becomes large gradually toward the center of a longitudinal direction.

  The inner bracket 76 has a fixing bolt 98 inserted through the bolt hole 86 at the center in the longitudinal direction of the connecting plate 80 and is screwed into the screw hole 26 of the first mounting member 14. It is fixed against. The stopper portion 82 and the bound contact portion 84 may be fixed to the connection plate 80 in advance, or may be fixed to the connection plate 80 after the connection plate 80 is attached to the first mounting member 14. .

  Further, when the inner bracket 76 is mounted on the mount body 12, the pair of stopper portions 82, 82 has the shaft direct contact portion 90 at a predetermined distance on the outer peripheral side with respect to the locking piece 46 of the second mounting member 16. The rebound contact portion 92 is disposed above the positioning portion 44 of the second mounting member 16 with a predetermined distance therebetween. The shaft straight stopper means for restricting the relative displacement amount of the first mounting member 14 and the second mounting member 16 in one direction perpendicular to the shaft is the shaft direct contact portion 90 of the stopper portions 82, 82 and the second direct contact portion 90. The mounting member 16 is in contact with the locking piece 46. Further, the rebound stopper means for restricting the relative displacement amount of the first mounting member 14 and the second mounting member 16 toward the axially separated side includes the rebound contact portion 92 of the stopper portions 82 and 82 and the second mounting member. It is comprised by contact | abutting with 16 positioning parts 44. FIG. Further, in this embodiment, the outer peripheral surface of the locking piece 46 constituting the stopper means and the upper surface of the positioning portion 44 are covered with the buffer rubber 100, so that the stopper portion 82 and the second mounting member 16 are cushioned. It comes to contact. The cushion rubber may be provided between the contact surfaces of the stopper means, and may be fixed to the stopper portion 82 side.

  The outer bracket 78 is a highly rigid member similar to the inner bracket 76, and includes a mounting portion 102 that is attached to the second mounting member 16 and a mounting portion that protrudes laterally from a part of the circumference of the mounting portion 102. 104.

  The mounting portion 102 has an annular shape that is continuous in the circumferential direction, and has an outer diameter that is smaller than the inner diameter of the locking piece 46 and an inner diameter that is smaller than the inner diameter of the intermediate sleeve 28. Further, a buffer rubber 106 extending in the circumferential direction is fixed to a lower surface of a part of the circumference of the mounting portion 102.

  The mounting portion 104 has a block shape that protrudes upward at a part of the circumference of the mounting portion 102 and then extends to the side. In addition, a plurality of bolt holes 107 extending in the vertical direction are formed through the mounting portion 104, and a cylindrical or annular fixing protrusion 108 protruding upward around one bolt hole 107. And the seating surface of the bolt or nut is constituted by the upper surface thereof. Further, the mounting portion 104 is provided with a positioning pin 109 that protrudes downward.

  The outer bracket 78 has the mounting portion 102 inserted into the locking piece 46 and brought into contact with the positioning portion 44 from below, and the lower end portion of the locking piece 46 is bent toward the inner peripheral side to By being superimposed on the lower surface, it is caulked and fixed to the lower end of the second mounting member 16. The mounting portion 102 of the outer bracket 78 is disposed on the inner peripheral side of the locking piece 46 and is brought into contact with the inner peripheral surface of the locking piece 46 and the lower surface of the positioning portion 44. The load resistance of the stopper means is sufficiently ensured by utilizing the rigidity of the mounting portion 102, and the shaft straight stopper means and the rebound stopper means are configured including the mounting portion 102.

  In the mounting state of the outer bracket 78 to the mount body 12, the mounting portion 104 protrudes laterally through the notch 48 of the locking piece 46, and the fixed portion of the buffer rubber 106 in the mounting portion 104 is bound to the inner bracket 76. The abutting portion 84 is disposed so as to be spaced apart upward. As a result, the bound stopper means for limiting the relative displacement amount of the first mounting member 14 and the second mounting member 16 toward the axially approaching side is realized by the contact between the mounting portion 104 and the bound contact portion 84. ing.

  Here, the mount body 12 has an oval shape when viewed in the vertical axis direction. More specifically, the outer peripheral surface of the main rubber elastic body 18 has an oval shape when viewed in the vertical axis direction, and the large-diameter recess 30 has an oval shape. The shape of the inner peripheral surface 18 is also an ellipse when viewed in the vertical axis direction. Note that the diameter of the large-diameter recess 30 is larger than the short-axis direction in the major axis direction of the main rubber elastic body 18, and the large-diameter recess 30 is in the outer shape of the main rubber elastic body 18 in the vertical axis direction view. The oval shape is substantially corresponding. In addition, the “oval shape” includes an oval shape (oval shape) having a straight line portion in addition to an elliptical shape formed entirely by a curve.

  Further, the entire second mounting member 16 including the fixing portion of the main rubber elastic body 18 has an oval shape when viewed in the vertical axis direction. The major axis direction of the mounting member 16 is coincident. The second mounting member 16 of the present embodiment includes a large-diameter cylindrical portion 42 that is a fixed portion to the main rubber elastic body 18 and a small-diameter cylindrical portion 40 that is out of the fixed portion to the main rubber elastic body 18. These are all formed into an oval shape when viewed in the vertical axis direction, but if the portions (the intermediate sleeve 28 and the large diameter cylindrical portion 42) fixed to the outer peripheral surface of the main rubber elastic body 18 are formed into an oval shape. The shape of the other portion (small-diameter cylindrical portion 40) when viewed in the vertical axis direction is not particularly limited, and may be a perfect circle or the like.

  Furthermore, the flexible film 32 is fixed to the lower opening of the second mounting member 16 over the entire circumference, and is inserted into the small-diameter cylindrical portion 40 of the second mounting member 16 to be fitted. The partition member 52 is also formed in an oval shape when viewed in the vertical axis direction. In the present embodiment, the accommodation space 60, the movable film 62, the first and second through holes 72, 74, etc. provided in the partition member 52 are all oval when viewed in the vertical axis direction. . When the small-diameter cylindrical portion 40 of the second mounting member 16 has a shape other than an ellipse (such as a perfect circle) when viewed in the vertical axis direction, the flexible membrane 32 and the partition member 52 are also vertically The shape corresponds to the small-diameter cylindrical portion 40 when viewed in the axial direction.

On the other hand, the first mounting member 14 has a rotating body shape around the central axis, and the diameter is substantially constant over the entire circumference. Thus, the first mounting member 14 and the distance between the second mounting member 16 is changed at the circumference, free length in the long axis direction of the main rubber elastic body 18: L ₂ (FIG. 4), The free length in the minor axis direction of the main rubber elastic body 18 is set larger than L ₁ (FIG. 3).

  Then, as shown in FIG. 4, the pair of stopper portions 82, 82 of the inner bracket 76 face the locking piece 46 of the second mounting member 16 in the major axis direction of the main rubber elastic body 18. Are arranged. Accordingly, the stopper action of the axial straight stopper means for restricting the relative displacement amount of the first mounting member 14 and the second mounting member 16 is exhibited in the major axis direction of the main rubber elastic body 18. . Therefore, the deformation amount of the main rubber elastic body 18 is limited in the long axis direction in which the free deformation of the main rubber elastic body 18 tends to increase the amount of elastic deformation, thereby improving the durability.

  Further, the mounting portion 104 of the outer bracket 78 protrudes laterally in the short axis direction of the main rubber elastic body 18. As a result, the power unit 22 can be supported at a position closer to the center of gravity of the engine mount 10, and the moment due to the shared support load of the power unit 22 and the vibration load in the axial direction is reduced, thereby improving load resistance and vibration isolation performance. Can be achieved.

  The engine mount 10 having such a structure is arranged so that the major axis direction of the main rubber elastic body 18 is substantially coincident with the vehicle front-rear direction, and the first mounting member 14 is disposed on the vehicle body via the inner bracket 76. 20 and the second attachment member 16 is attached to the power unit 22 via the outer bracket 78. More specifically, both ends and lower end support portions 88 of the connecting plate 80 of the inner bracket 76 are fixed to the vehicle body 20 with bolts, and the mounting portions 104 of the outer bracket 78 are fixed to the power unit 22 with bolts. Thereby, the engine mount 10 is interposed between the vehicle body 20 and the power unit 22, and the vehicle body 20 and the power unit 22 are connected in a vibration-proof manner.

  When a low-frequency large-amplitude vibration corresponding to an engine shake is input in the vehicle-mounted state as described above, the fluid flows between the liquid chambers 66 and 68 through the orifice passage 70, and the resonance action of the fluid or the like. An anti-vibration effect (vibration damping effect) based on the fluid action is exhibited.

  On the other hand, when a medium to high frequency small amplitude vibration corresponding to idling vibration or traveling noise is input, the hydraulic pressure of the pressure receiving liquid chamber 66 is transmitted to the equilibrium liquid chamber 68 due to the positive minute deformation of the movable film 62. Thus, the hydraulic pressure transmitted by the deformation of the flexible film 32 is absorbed. As a result, high dynamic springs due to substantial sealing of the pressure-receiving liquid chamber 66 are avoided, and the intended vibration isolation effect (vibration insulation effect) can be effectively obtained.

  Further, when the automobile is accelerated or decelerated, a load perpendicular to the axis is input. Therefore, in the engine mount 10, the main rubber elastic body 18 has an oval shape when viewed in the vertical axis direction, and the free length of the main rubber elastic body 18 is set large in the long axis direction, and the long axis direction is It substantially coincides with the input direction of the load due to acceleration / deceleration (the longitudinal direction of the vehicle). Thereby, the durability of the main rubber elastic body 18 is sufficiently ensured in the vehicle front-rear direction in which the load due to acceleration / deceleration is repeatedly input.

  Moreover, the relative displacement amount of the first attachment member 14 and the second attachment member 16 in the vehicle front-rear direction is restricted by the axial straight stopper means, and the elastic deformation amount in the major axis direction of the main rubber elastic body 18 is reduced. Limited. Therefore, excessive deformation of the main rubber elastic body 18 is prevented in the long axis direction in which the free length is set large and the amount of elastic deformation tends to be large, and durability is improved.

  Furthermore, since the mount body 12 is an inverted type and the inner bracket 76 and the outer bracket 78 having a large mass are arranged at relatively low positions, the center of gravity of the engine mount 10 is set downward. Therefore, by ensuring a large free length of the main rubber elastic body 18 in the major axis direction, it is possible to sufficiently ensure the falling rigidity around the minor axis, which tends to be insufficient, and to realize excellent load resistance. it can.

  Moreover, since the outer bracket 78 is fixed to the lower end portion of the second mounting member 16, the position of the center of gravity of the engine mount 10 is set further downward, and an improvement in load resistance is realized.

  Further, the left-right direction of the vehicle, which has a smaller input load than the front-rear direction of the vehicle, substantially coincides with the short-axis direction of the main rubber elastic body 18, and in the left-right direction of the vehicle while ensuring durability according to the input load. The downsizing is realized. In addition, since the mounting portion 104 of the outer bracket 78 protrudes in the short axis direction, the input position of the shared support load and the axial vibration load of the power unit 22 can be set closer to the center of gravity of the engine mount 10. it can. Therefore, the moment acting by the input of these loads is reduced, and the load resistance such as the falling rigidity and the vibration isolation performance can be stably obtained.

  Further, in the engine mount 10, the large-diameter recess 30 formed in the main rubber elastic body 18 has an oval shape substantially similar to the outer shape of the main rubber elastic body 18 when viewed in the vertical axis direction. Thereby, the effective piston area of the pressure receiving liquid chamber 66 is secured large without requiring a partial thinning or large diameter of the main rubber elastic body 18, and the internal pressure fluctuation of the pressure receiving liquid chamber 66 is efficiently performed during vibration input. Induced by Therefore, the anti-vibration effect based on the fluid flow action or the like is efficiently exhibited, and the anti-vibration performance is improved.

  6 and 7 show an engine mount 110 as a second embodiment of the present invention. The engine mount 110 has a structure in which an inner bracket 76 and an outer bracket 114 are attached to a mount body 112. In the following description, members and portions that are substantially the same as those of the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  The mount main body 112 has a structure in which the first mounting member 14 and the second mounting member 116 are elastically connected by the main rubber elastic body 18. The second attachment member 116 has a thin, large-diameter, substantially long cylindrical shape, and includes a step portion 118 at an intermediate portion in the axial direction, and the upper portion is a small-diameter cylindrical portion 120 across the step portion 118. The lower portion is a large-diameter cylindrical portion 122.

  The first mounting member 14 is disposed on the same central axis below the second mounting member 116, and the first mounting member 14 and the second mounting member 116 are elastically connected by the main rubber elastic body 18. Has been. The main rubber elastic body 18 is vulcanized and bonded to the large diameter cylindrical portion 122 of the second mounting member 116 at the outer peripheral surface on the large diameter side. Further, an integrally formed thin-walled cylindrical sealing rubber layer 124 projects upward from the large-diameter side end of the main rubber elastic body 18, and the inner periphery of the small-diameter cylindrical portion 120 of the second mounting member 116. The entire surface is covered with a seal rubber layer 124.

  A flexible film 126 is attached to the second attachment member 116. The flexible membrane 126 has a thin, substantially oval shape and has sufficient slack in the axial direction. Further, the outer peripheral end portion of the flexible film 126 is fixed to the fixing member 128. The fixing member 128 is a cylindrical or ring-shaped member, and a flexible film 126 is fixed so as to close the central hole. Then, after the fixing member 128 is inserted and disposed in the upper opening of the small-diameter cylindrical portion 120 of the second mounting member 116, the flexible membrane 126 is formed by reducing the diameter of the small-diameter cylindrical portion 120. It arrange | positions so that the upper side opening part of the 2 attachment members 116 may be obstruct | occluded.

  An outer bracket 114 is attached to the mount body 112 having such a structure. The outer bracket 114 integrally includes a mounting portion 130 and a mounting portion 104. The mounting portion 130 has a long cylindrical shape, and the mounting portion 104 protrudes outward in the short axis direction from the upper end portion thereof.

  The outer bracket 114 is fixed to the second mounting member 116 by press-fitting the large-diameter cylindrical portion 122 of the second mounting member 116 into the mounting portion 130. When the outer bracket 114 is mounted, the mounting portion 130 is disposed opposite to the stopper portion 82 of the inner bracket 76 at a predetermined distance in the direction perpendicular to the axis (vehicle longitudinal direction) and the axial direction (vehicle vertical direction). Yes. Then, the shaft direct stopper means of the present embodiment is configured by the second mounting member 116 contacting the shaft direct contact portion 90 of the stopper portion 82 via the mounting portion 130. Further, the second attachment member 116 abuts on the rebound abutment portion 92 of the stopper portion 82 via the mounting portion 130, thereby constituting the rebound stopper means of the present embodiment. In the present embodiment, the buffer rubber 100 is attached to the mounting portion 130 of the outer bracket 114, and the upper surface and the outer peripheral surface of the mounting portion 130 are covered with the buffer rubber 100.

  As apparent from the structure of the engine mount 110 according to this embodiment, the second mounting member is not necessarily limited to a structure in which the main rubber outer (intermediate sleeve 28) and the diaphragm outer (outer cylinder member 36) are combined. However, it may be a single member (for example, the second mounting member 116).

  Furthermore, the mounting method of the outer bracket to the second mounting member is not limited to the caulking and fixing shown in the first embodiment, but the press-fitting and fixing after the insertion / extraction as shown in the present embodiment. The fitting (diaphragm fixation) by a diameter etc. can be employ | adopted.

  FIG. 8 shows an engine mount 140 as a third embodiment of the present invention. The engine mount 140 has a structure in which an inner bracket 144 and an outer bracket 146 are attached to a mount body 142.

  The mount main body 142 has a structure in which the first attachment member 148 and the second attachment member 150 are elastically connected by the main rubber elastic body 18. The first mounting member 148 has a solid substantially cylindrical shape, and includes an abutting protrusion 152 that protrudes to the outer peripheral side at an axially intermediate portion.

  The second mounting member 150 has substantially the same structure as the second mounting member 116 of the second embodiment, and a flange-shaped positioning portion 154 that protrudes to the outer peripheral side at the lower end portion, and positioning A long cylindrical locking piece 156 protruding downward from the outer peripheral end of the portion 154 is integrally formed.

  The first mounting member 148 is disposed below the second mounting member 150, and the first mounting member 148 and the second mounting member 150 are elastically connected by the main rubber elastic body 18. In the present embodiment, the buffer rubber 158 that protrudes downward from the main rubber elastic body 18 is integrally formed, and the outer peripheral surface and the lower surface of the contact protrusion 152 of the first mounting member 148 are covered with the buffer rubber 158. ing.

  Further, an inner bracket 144 and an outer bracket 146 are attached to the mount body 142. The inner bracket 144 has a rectangular plate shape that is elongated in the longitudinal direction of the vehicle. Bolt holes 160 are formed in the central portion and both end portions in the longitudinal direction, and the first mounting member is formed by the central bolt hole 160. It attaches to 148 and is attached to the vehicle body 20 (not shown) by bolt holes 160, 160 at both ends. Further, a buffer rubber 162 is fixed to the upper surface of the inner bracket 144 at an intermediate portion in the longitudinal direction.

  The outer bracket 146 includes a mounting portion 164 that is fixed to the second mounting member 150, a stopper portion 166 that extends downward from the mounting portion 164, and a mounting (not shown) that projects laterally (leftward in the vehicle) from the mounting portion 164. The unit 104 is integrally provided. The mounting portion 164 has a long cylindrical shape, and a locking groove 168 extending in the circumferential direction is formed to open to the outer peripheral surface. The stopper portion 166 is provided, for example, about a half circumference on the circumference of the mounting portion 164, and includes a curved plate-shaped front and rear contact portion 170 that protrudes downward, and an inner periphery from the lower end of the front and rear contact portion 170. A plate-like vertical contact portion 172 that protrudes to the side is integrally provided.

  The outer bracket 146 is bent inward so that the lower end portion of the locking piece 156 enters the locking groove 168 after the mounting portion 164 is inserted into the locking piece 156 of the second mounting member 150. As a result, the second mounting member 150 is fixed. According to such a mounting state of the outer bracket 146, the outer bracket 146 extends downward from the second mounting member 150 and is disposed, so that the center of gravity can be further lowered.

  Further, in the mounted state of the outer bracket 146, the front / rear contact portion 170 is disposed to face the contact protrusion 152 of the first mounting member 148 at a predetermined distance in the vehicle front-rear direction. As a result, the abutting protrusion 152 and the front and rear abutting portion 170 constitute the shaft straight stopper means of the present embodiment. In addition, the upper and lower contact portions 172 are disposed between the axially opposed surfaces of the contact protrusion 152 and the inner bracket 144, and a predetermined amount in the axial direction with respect to any of the contact protrusion 152 and the inner bracket 144. Opposed to each other at a distance. As a result, the abutment protrusion 152 and the upper and lower contact portion 172 constitute the rebound stopper means of the present embodiment, and the inner bracket 144 and the upper and lower contact portion 172 constitute the bound stopper means of the present embodiment. Is configured. Thus, in the engine mount 140, since the stopper means is provided in the lower part of the engine mount 140, the load resistance against the stopper load, the lowering of the center of gravity, and the like are effectively realized. In any of the straight shaft stopper means, the rebound stopper means, and the bound stopper means, the shock absorbing rubber 158 and 162 are interposed between the contact surfaces, so that the impact at the time of contact is reduced. Yes.

  As is apparent from the engine mount 140 according to this embodiment, the shaft straight stopper means and the rebound stopper means are not necessarily limited to those configured using the inner bracket.

  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 structure of the mount body 12 is merely an example, and is not particularly limited as long as it is a fluid-filled vibration isolator. Specifically, for example, a plurality of orifice passages having different tuning frequencies may be provided, and communication and blocking of the orifice passages may be switched by a valve body such as a pneumatic type or an electromagnetic type. good.

  The pair of stopper portions 82 and 82 may be integrally formed as one member with their upper end portions connected to each other by a connecting portion extending so as to straddle the mount body 12 in the major axis direction, for example. .

  The fluid-filled vibration isolator according to the present invention is not only used as an engine mount, but can also be used as a body mount, a subframe mount, a differential mount, and the like. The scope of application of the present invention is not limited to automobiles, and can be suitably applied to, for example, a fluid-filled vibration isolator used for motorcycles, railway vehicles, industrial vehicles, and the like.

10, 110, 140: engine mount (fluid-filled vibration isolator), 14, 148: first mounting member, 16, 116, 150: second mounting member, 18: main rubber elastic body, 20: vehicle body (Vibration target member), 22: power unit (vibration source), 30: large-diameter recess, 32, 126: flexible membrane, 46, 156: locking piece, 52: partition member, 66: pressure receiving liquid chamber, 68: Equilibrium chamber, 70: Orifice passage, 76: Inner bracket, 78, 114, 82: Stopper portion, 146: Outer bracket, 104: Mounting portion, 90: Shaft direct contact portion (shaft direct stopper means), 100 : Buffer rubber (shaft straight stopper means), 102, 130: mounting part (shaft straight stopper means), 122: large diameter cylindrical part (shaft straight stopper means), 152: contact protrusion (shaft straight stopper means), 158 : Buffer rubber (straight shaft Stopper means), 170: front and rear abutment (axial straight stopper means)

Claims (5)

The first mounting member is disposed below the second mounting member that is formed in a cylindrical shape extending vertically, and the first mounting member and the second mounting member are elastically connected by the main rubber elastic body, The first attachment member is adapted to be attached to a vibration isolation target member, and the second attachment member is adapted to be attached to a vibration source, while being supported by the second attachment member. A pressure receiving liquid chamber in which a part of the wall portion is formed of the main rubber elastic body is formed on one side across the partition member, and a part of the wall portion is a flexible membrane on the other side. In the fluid-filled vibration isolator in which an equilibrium liquid chamber is formed, and an orifice passage that connects the pressure receiving liquid chamber and the equilibrium liquid chamber to each other is formed.
The main rubber elastic body has an oval shape when viewed in the vertical axis direction, and a fixing portion of the second mounting member to the main rubber elastic body is formed in an oval shape when viewed in the vertical axis direction, While the free length in the major axis direction of the main rubber elastic body is larger than the free length in the minor axis direction,
The outer bracket attached to the second attachment member includes an attachment portion that protrudes laterally in the minor axis direction of the main rubber elastic body, and the attachment portion is attached to the vibration source. In addition, a fluid-filled type anti-rotation device is provided, wherein a shaft straight stopper means for restricting the relative displacement between the first mounting member and the second mounting member in the major axis direction of the main rubber elastic body is provided. Shaker.   The fluid filled type vibration damping device according to claim 1, wherein the outer bracket is attached to a lower end portion of the second mounting member.   The second mounting member is provided with a locking piece projecting downward from the fixing portion of the main rubber elastic body, and the outer bracket is fixed to the second mounting member by caulking and fixing with the locking piece. The fluid-filled vibration isolator according to claim 2, which is attached.   An inner bracket is attached to the first attachment member, and the first attachment member is attached to the vibration isolation target member via the inner bracket. A stopper portion that is opposed to the second mounting member in the major axis direction of the main rubber elastic body is provided, and the axial straight stopper means is configured by contact between the stopper portion and the second mounting member. The fluid-filled vibration isolator according to any one of claims 1 to 3.   The main rubber elastic body has a liquid chamber forming recess that opens upward, and the opening of the liquid chamber forming recess is covered with the partition member to form the pressure receiving liquid chamber. The fluid-filled vibration isolator according to any one of claims 1 to 4, wherein the diameter of the liquid chamber forming recess is larger in the major axis direction than in the minor axis direction.

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