JP2013257031A - Fluid-filled vibration-proofing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel fluid-filled vibration-proofing device capable of reducing or eliminating hammering noise resulting from the contact of a movable membrane on a partition member by a simple structure with less number of parts.SOLUTION: Cushioning rubbers 90, 92 which are provided to the wall inner surfaces 104, 106 of a storage empty space 78 and which cover the hitting surface of a movable membrane 88 are formed integrally with the movable membrane 88 through connection parts 102, 102 connected to the movable membrane 88, and stackingly disposed on the wall inner surfaces 104, 106 of the storage empty space 78.

Description

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

  2. Description of the Related Art Conventionally, a fluid-filled vibration isolator is known as a type of a vibration isolator that is interposed between members constituting a vibration transmission system and supports the vibration isolation connection or anti-vibration of these members. Application to engine mounts is under consideration. As shown in, for example, Japanese Patent Application Laid-Open No. 2009-52675 (Patent Document 1), a fluid-filled vibration isolator includes a first attachment member attached to one member constituting a vibration transmission system, and vibration transmission The second attachment member attached to the other member constituting the system has a structure elastically connected by the main rubber elastic body. Furthermore, with the partition member supported by the second mounting member interposed therebetween, a pressure receiving chamber in which a part of the wall portion is formed of a main rubber elastic body is formed on one side, and on the other side An equilibrium chamber in which a part of the wall portion is formed of a flexible film is formed, and the pressure receiving chamber and the equilibrium chamber are communicated with each other by an orifice passage.

  In addition, in the fluid-filled vibration isolator of Patent Document 1, a hydraulic pressure absorption mechanism using a movable film is provided in order to obtain an effective vibration isolating effect against vibration input having a frequency higher than the tuning frequency of the orifice passage. It has been. In other words, the movable membrane is accommodated and disposed in the accommodation space formed inside the partition member, and the minute volume change of the pressure receiving chamber is allowed by the minute deformation of the movable membrane, so that the input of the high frequency small amplitude vibration is prevented. The vibration insulation effect due to the low dynamic spring is exhibited.

  By the way, in such a hydraulic pressure absorption mechanism, the deformation amount of the movable film is applied to the inner surface of the housing space in order to efficiently induce fluctuations in the internal pressure of the pressure receiving chamber at the time of vibration input in the frequency range in which the orifice passage is tuned. The volume change of the pressure receiving chamber is restricted.

  However, if the movable film is brought into contact with the inner surface of the wall of the housing space to limit the deformation or displacement thereof, the impact is caused when the movable film strikes the inner surface of the wall of the housing space. There was a problem that sound was generated.

  In addition, it is conceivable to reduce the impact force caused by the impact of the movable film by forming a buffer rubber layer on the inner surface of the wall of the housing space, but it is also possible to suppress the hitting sound. It was difficult to avoid an increase in the number.

JP 2009-52675 A

  The present invention has been made in the background of the above-mentioned circumstances, and its solution is to reduce or reduce the sound caused by contact of the movable membrane with the partition member by a simple structure with a small number of parts. An object of the present invention is to provide a fluid-filled vibration isolator having a novel structure that can be prevented.

  That is, according to the first aspect of the present invention, the first attachment member and the second attachment member are elastically connected by the main rubber elastic body, and the partition member supported by the second attachment member is sandwiched. A pressure receiving chamber in which a part of the wall part is formed of the main rubber elastic body is formed on one side, and an equilibrium chamber in which a part of the wall part is formed of a flexible film on the other side. Is formed, and an orifice passage is formed to communicate the pressure receiving chamber and the equilibrium chamber with each other. A movable film is disposed in the accommodation space formed in the partition member. In the fluid-filled vibration isolator in which the fluid pressure of the pressure receiving chamber and the fluid pressure of the equilibrium chamber are exerted on both surfaces of the housing, the striking surface of the movable film provided on the inner surface of the housing cavity A buffer rubber that covers the movable film is integrally formed with the movable film with a connecting portion to the movable film, That is superimposed on the wall inner surface of the housing space is arranged, characterized.

  According to the fluid-filled vibration isolator having the structure according to the first aspect as described above, the impact sound generated when the movable film comes into contact with the inner wall surface of the housing space is energy based on the internal friction of the buffer rubber or the like. Reduced by damping action. In this case, since the shock absorbing rubber is integrally formed with the movable film with the connecting portion, the shock absorbing rubber can be disposed without requiring an increase in the number of parts, and a reduction in hitting sound is realized with a simple structure. It becomes possible.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator described in the first aspect, the shock absorbing rubber is integrally formed on both surfaces of the movable film, and the pressure receiving chamber in the accommodation space is provided. The buffer rubber is disposed so as to overlap the inner wall surface on the side and the inner wall surface on the equilibrium chamber side.

  According to the second aspect, since the buffer rubber is superimposed on each of the inner wall surface on the pressure-receiving chamber side and the inner wall surface on the equilibrium chamber side in the accommodation space, the hitting sound due to the contact of the movable film is more effective. Reduced. Furthermore, since the buffer rubbers superimposed on the inner surfaces of the walls are all formed integrally with the movable film, an increase in the number of parts is avoided.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator described in the first or second aspect, a wall inner surface on the pressure-receiving chamber side and an inner wall surface on the equilibrium chamber side of the housing space. At least one of the buffer rubbers arranged to be overlapped with the wall inner surface is constituted by a plurality of divided buffer rubbers integrally formed with the movable film.

  According to the 3rd aspect, it becomes possible to cover the wall inner surface of a storage space over a wide range by several comparatively small division | segmentation buffer rubber | gum. Therefore, when the mold is removed, the buffer rubber is prevented from being cut off, and the problem that the buffer rubber hangs down by its own weight and is separated from the inner wall surface of the storage space is avoided. .

  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, positioning means for positioning the movable film with respect to the partition member in the circumferential direction is provided. It is provided.

  According to the fourth aspect, since the cushioning rubber integrally formed with the movable film is also positioned with respect to the partition member by the positioning means, the cushioning rubber is overlapped at a predetermined position with respect to the wall inner surface of the accommodation space. Arranged. Therefore, it is possible to effectively obtain a target contact sound reduction effect.

  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, the connecting portion is formed to protrude outward in the thickness direction from the movable film. In addition, the buffer rubber is formed in a state of being bent from the protruding tip of the connecting portion and extending in parallel with the movable film.

  According to the fifth aspect, since the shock absorbing rubber is formed in advance in a state of spreading in parallel with the movable film, the shock absorbing rubber and the connecting portion are deformed by being placed superimposed on the inner wall surface of the accommodation space. Is prevented. Therefore, the initial stress in the non-input state of the external force can be reduced, and the durability can be improved.

  According to a sixth aspect of the present invention, in the fluid-filled vibration isolator described in the fifth aspect, the connecting portion protrudes from an outer peripheral portion of the movable membrane, and the movable membrane extends from the connecting portion. The shock absorbing rubber extends so as to extend toward the opposite side in the radial direction.

  According to the 6th aspect, the length of a buffer rubber can be ensured large, and the wall inner surface of a storage space can be covered with buffer rubber over a wide range with the number of small connection parts.

  According to a seventh aspect of the present invention, in the fluid-filled vibration isolator described in the sixth aspect, the shock-absorbing rubber positioned opposite to one surface of the movable film and the other surface of the movable film The buffer rubber located is provided with the two connecting portions projecting to opposite sides from both end edges facing each other in the radial direction of the movable film, and opposite to each other in the radial direction of the movable film It extends to extend.

  According to the seventh aspect, since the portion where the rigidity is increased by the formation of the connecting portion is disposed at two positions facing in one radial direction, the deformation mode of the movable film is stabilized, and the center of the movable film Elastic deformation in the part is sufficiently allowed.

  According to an eighth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to fourth aspects, the movable film has a shape that protrudes further outward from the connecting portion. Rubber is integrally formed, and the cushioning rubber is pressed against the wall inner surface of the housing cavity by the arrangement of the movable film in the housing cavity, and is superimposed on the wall inner surface of the housing cavity in a collapsed state. It is what has been.

  According to the eighth aspect, since the buffer rubber is formed in a shape further protruding outward from the connecting portion, the buffer rubber is integrally provided by a simple mold structure combined in the thickness direction of the movable film. A movable film can be formed. In addition, since the buffer rubber is pressed against the wall inner surface of the housing cavity and overlaid on the wall inner surface of the housing cavity in the state where the movable film is disposed in the housing cavity, the buffer rubber and the coupling are connected. The buffer rubber is held in a state of being pressed against the inner surface of the wall of the housing space by the elasticity of the portion. Therefore, drooping due to its own weight is prevented, and the distance between the opposed surfaces of the movable film and the buffer rubber is stably maintained at a predetermined dimension.

  According to a ninth aspect of the present invention, in the fluid-filled vibration isolator described in the eighth aspect, the connecting portion is more easily elastically deformed than the buffer rubber.

  According to the ninth aspect, the shock-absorbing rubber is pressed against the inner wall surface of the housing space, and the connecting portion is elastically deformed, so that the shock-absorbing rubber falls down and is superimposed on the inner wall surface of the housing space. Thereby, the deformation of the buffer rubber is reduced at the time of disposition, and the change in the spring constant due to the deformation is suppressed, so that the intended buffer action can be stably obtained.

  According to the present invention, the buffer rubber that covers the contact portion of the movable film on the inner surface of the wall of the housing cavity is formed integrally with the movable film with the connecting portion. Thereby, the hitting sound generated by the contact of the movable membrane with the inner surface of the housing space is reduced by a simple structure with a small number of parts.

It is a longitudinal cross-sectional view which shows the engine mount as the 1st Embodiment of this invention, Comprising: The figure corresponded in the II cross section in FIG. The top view of the partition member which comprises the engine mount shown by FIG. IV-IV sectional drawing of FIG. IV-IV sectional drawing of FIG. The perspective view of the elastic movable body which comprises the partition member shown by FIG. The top view of the elastic movable body shown by FIG. VII-VII sectional drawing of FIG. The longitudinal cross-sectional view which shows the engine mount as the 2nd Embodiment of this invention. The perspective view of the elastic movable body which comprises the engine mount shown by FIG. The top view of the elastic movable body shown by FIG. XI-XI sectional drawing of FIG. The longitudinal cross-sectional view of the elastic movable body which comprises the engine mount as another one Embodiment of this invention. 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.

  FIG. 1 shows 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 has a structure in which a first mounting member 12 and a second mounting member 14 are elastically connected by a main rubber elastic body 16. In the following description, the vertical direction means, in principle, the vertical direction in FIG. 1 that is the axial direction.

  More specifically, the first mounting member 12 is a high-rigidity block body made of iron, aluminum alloy, or the like, and a flange portion 18 protruding to the outer peripheral side is integrally formed at an axially intermediate portion. Yes. Further, the first mounting member 12 is formed with a screw hole 20 that is open on the upper surface and extends linearly up and down, and a thread is formed on the inner peripheral surface.

  The second mounting member 14 has a substantially cylindrical shape as a whole, and is a highly rigid member formed of the same material as the first mounting member 12. Further, a step portion 22 is provided in an axially intermediate portion of the second mounting member 14, and a caulking piece 24 having a larger diameter than the upper side is integrally formed below the step portion 22. Further, a taper portion 26 that widens upward is provided at the upper end portion of the second mounting member 14, and a flange-like fitting piece 28 that protrudes to the outer peripheral side is provided at the upper end of the taper portion 26. It is integrally formed.

  The first mounting member 12 is disposed above the second mounting member 14, and the first mounting member 12 and the second mounting member 14 are elastically connected by the main rubber elastic body 16. The main rubber elastic body 16 has a thick-walled, large-diameter, generally frustoconical shape, and a small-diameter end is vulcanized and bonded to the first attachment member 12 and a large-diameter end is a second attachment. Vulcanized and bonded to the inner peripheral surface of the member 14. The main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first and second mounting members 12 and 14.

  Furthermore, a large-diameter recess 30 is formed in the main rubber elastic body 16. The large-diameter recess 30 is a recess that opens to the large-diameter end surface of the main rubber elastic body 16, and has an upper portion having a substantially reverse mortar shape and a lower portion having a columnar shape extending with a substantially constant diameter. .

  Furthermore, a stopper rubber 32 is formed integrally with the main rubber elastic body 16 above the main rubber elastic body 16 and fixed to the upper surface and the outer peripheral surface of the flange portion 18 of the first mounting member 12. A stopper rubber 32 is disposed between opposing surfaces of the flange portion 18 of the first attachment member 12 and the stopper cylinder member 34 that is caulked and fixed to the fitting piece 28 of the second attachment member 14. The flange portion 18 and the stopper cylinder member 34 come into contact with each other via the stopper rubber 32, so that a stopper means for buffering the relative displacement between the first mounting member 12 and the second mounting member 14 is configured. .

  Further, a substantially cylindrical sealing rubber layer 36 extending downward from the large-diameter end surface is integrally formed on the main rubber elastic body 16 and is fixed to the inner peripheral surface of the second mounting member 14. In the seal rubber layer 36 of the present embodiment, the inner peripheral surface is a tapered surface having an inner diameter that gradually increases downward, and a partition member 48 described later can be easily inserted.

  A flexible film 38 is attached to the second attachment member 14. The flexible film 38 is a thin rubber film having a substantially disk shape, and is sufficiently slackened in the thickness direction. Further, a fixing member 40 is fixed to the outer peripheral end portion of the flexible film 38. The fixing member 40 has a substantially annular plate shape as a whole, and the inner peripheral portions of the upper and lower surfaces are fixed to the outer peripheral end of the flexible membrane 38, and the inner peripheral portions of the upper and lower surfaces are flexible membrane 38. It is covered with the outer peripheral edge.

  The flexible film 38 is disposed so that the lower end opening of the second mounting member 14 is closed by caulking and fixing the outer peripheral portion of the fixing member 40 by the caulking piece 24 of the second mounting member 14. Has been. In the present embodiment, a bracket 44 in which a mounting bolt 42 is implanted in a cup shape is caulked and fixed to the second mounting member 14 together with the fixing member 40.

  By mounting the flexible film 38 to the second mounting member 14, the fluid sealing region that is fluid-tightly separated from the external space is provided between the opposing surfaces of the main rubber elastic body 16 and the flexible film 38. 46 is formed to enclose the incompressible fluid. The incompressible fluid sealed in the fluid sealing region 46 is not particularly limited. For example, water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixed solution thereof are all suitable. Can be adopted. Furthermore, a low-viscosity fluid having a viscosity of 0.1 Pa · s or less is desirable in order to advantageously obtain a vibration isolation effect based on the fluid flow action described later.

  A partition member 48 is disposed in the fluid sealing area 46. As shown in FIGS. 2 to 4, the partition member 48 has a generally thick and large-diameter disk shape as a whole, and includes a partition member body 50 and a bottom plate member 52. .

  The partition member main body 50 is a member that is formed of metal or synthetic resin and has a thick, large-diameter, substantially disk shape. A fitting recess 56 is formed. Furthermore, four upper through holes 58 are formed in the bottom wall portion of the meat recess 54 so as to penetrate vertically, and an upper rail extending in a cross shape between the circumferential directions of the four upper through holes 58. A portion 60 is formed. Furthermore, an upper receiving recess 62 is opened in the bottom surface of the fitting recess 56, and the upper receiving recess 62 has a smaller diameter than the fitting recess 56, and the upper portion has a smaller diameter than the lower portion. The stepped portion (bottom surface at the bottom) is an annular upper sandwiching surface 64. A circumferential groove 66 that opens to the outer peripheral surface is formed at the outer peripheral end of the partition member main body 50 so as to extend in the circumferential direction with a length of slightly less than one round. It should be noted that the thinning recess 54 and the upper receiving recess 62 are communicated with each other through the upper through hole 58.

  The bottom plate member 52 is a member that is formed of a metal or a synthetic resin and has a thin and large-diameter substantially disk shape, and a radially central portion is a fitting portion 68 that is thicker than the outer peripheral portion. Further, a lower housing recess 70 that opens to the upper surface is formed in the radial center portion of the fitting portion 68, and the lower clamping surface is formed on the outer peripheral side by using the upper surface of the inner peripheral end of the fitting portion 68. 72 is provided. Further, four lower through holes 74 are formed in the bottom wall portion of the lower receiving recess 70 so as to penetrate vertically, and a lower rail extending in a cross shape is provided between the circumferential directions of the four lower through holes 74. A portion 76 is formed. The lower through holes 74 extend in the vertical direction with substantially the same cross-sectional shape as the upper through holes 58, and the four lower through holes 74 are aligned with the four upper through holes 58 on the circumference.

  Then, the bottom plate member 52 is overlapped from below the partition member main body 50, and the fitting portion 68 of the bottom plate member 52 is fitted into the fitting recess 56 of the partition member main body 50. By combining the partition member main body 50 and the bottom plate member 52 in this way, the upper accommodation recess 62 and the lower accommodation recess 70 are used between the partition member main body 50 and the bottom plate member 52 to accommodate the accommodation space. 78 is formed. The accommodation space 78 has a small diameter at the upper and lower ends in the axial direction and a large diameter at the intermediate portion in the axial direction, and the upper and lower clamping surfaces 64 and 72 face each other in the axial direction at the outer peripheral end.

  The partition member 48 having such a structure is supported in an inserted state by the second mounting member 14 and extends in the direction perpendicular to the axis in the fluid sealing region 46. As a result, the fluid sealing region 46 is divided into two axial sides on both sides of the partition member 48. Above the partition member 48, a part of the wall portion is constituted by the main rubber elastic body 16, and vibration input is performed. A pressure receiving chamber 80 in which fluctuations in internal pressure are sometimes generated is formed. On the lower side of the partition member 48, a part of the wall portion is formed of a flexible film 38, and an equilibrium in which volume change is easily allowed. A chamber 82 is formed. The pressure receiving chamber 80 and the equilibrium chamber 82 are filled with an incompressible fluid.

  Further, the outer peripheral surface of the partition member 48 is overlapped with the second mounting member 14 via the seal rubber layer 36, and the outer peripheral opening of the peripheral groove 66 is covered fluid-tightly by the second mounting member 14 to form a tunnel shape. The flow path is formed. One end in the circumferential direction of the tunnel-shaped channel is communicated with the pressure receiving chamber 80 through the upper communication hole 83, and the other end is communicated with the equilibrium chamber 82 through the lower communication hole 84. An orifice passage 85 is formed to communicate the equilibrium chamber 82 with each other. The orifice passage 85 has a resonance frequency (tuning frequency) of the flowing fluid set according to the ratio (A / L) of the passage cross-sectional area (A) and the passage length (L) of about 10 Hz corresponding to the engine shake. Is set to a low frequency.

  Here, the elastic movable body 86 is accommodated in the accommodation space 78. The elastic movable body 86 is formed of a rubber elastic body, and includes a movable film 88, an upper buffer rubber 90, and a lower buffer rubber 92 as shown in FIGS.

  The movable film 88 is a substantially disk-shaped rubber film, and the central part in the radial direction is a film part 94 having a substantially constant thickness dimension, and the outer peripheral end part has a large diameter on the inner peripheral side. Thus, the outer peripheral clamping portion 96 has a cross-sectional shape that combines substantially semicircular shapes having different diameters.

  The upper and lower cushioning rubbers 90 and 92 are rubber elastic bodies having a substantially long rectangular plate shape, and the upper cushioning rubber 90 is disposed above the movable film 88 with a predetermined distance therebetween, and the lower cushioning rubber 92. Is disposed below the movable film 88 with a predetermined distance therebetween. Further, the buffer rubbers 90 and 92 of the present embodiment are formed with substantially constant thickness dimensions, and are thinner than the movable film 88. Further, the upper and lower cushioning rubbers 90 and 92 are integrally formed with a locking projection 98 at the end in the longitudinal direction. The locking protrusion 98 has a substantially quadrangular prism shape and is provided so as to protrude in the thickness direction of the buffer rubbers 90, 92. The upper buffer rubber 90 protrudes upward and the lower buffer rubber. In 92, it protrudes downward. Furthermore, the locking protrusion 98 is formed with a locking groove 100 that opens in the longitudinal direction of the buffer rubbers 90 and 92 and extends in the short direction. It should be noted that the protruding tip side of the locking protrusion 98 from the locking groove 100 is narrower in the longitudinal direction of the buffer rubbers 90 and 92 toward the protruding tip.

  As shown in FIGS. 5 and 7, the movable film 88 and the upper and lower cushioning rubbers 90 and 92 are integrally formed through connecting portions 102a and 102b. The connecting portions 102 are integrally formed on the outer peripheral portion of the film portion 94 in the movable film 88 and are respectively provided on both sides in the thickness direction of the film portion 94 and outward in the thickness direction with a substantially constant rectangular cross section. It protrudes. The protruding tip of the connecting portion 102a protruding upward from the upper surface of the movable film 88 is integrally connected to the longitudinal end portion of the upper cushioning rubber 90, and the connecting portion 102b protruding downward from the lower surface of the movable film 88. The projecting tip is integrally connected to the longitudinal end of the lower cushioning rubber 92. Thereby, each one of the buffer rubbers 90 and 92 is integrally formed on both surfaces of the movable film 88 with the connecting portions 102a and 102b. In other words, the upper and lower buffer rubbers 90 and 92 are formed so as to bend from the protruding tips of one of the connecting portions 102 a and 102 b and extend substantially in parallel with the movable film 88. Oppositely arranged at a predetermined distance on each one side. As described above, the movable film 88 and the upper and lower buffer rubbers 90 and 92 are connected and integrated via the connecting portions 102a and 102b, so that the movable film 88 and the upper and lower buffer rubbers 90 and 92 are integrally provided. An elastic movable body 86 is configured. For ease of understanding, the connecting portion 102 a is projected from the upper surface of the movable film 88, and the connecting portion 102 b is projected from the lower surface of the movable film 88.

  In the present embodiment, the connecting portions 102a and 102b are integrally formed on the outer peripheral portion of the membrane portion 94, and the cushioning rubbers 90 and 92 are opposite from the connecting portions 102a and 102b in the radial direction (left and right direction in FIG. 6). It spreads to extend toward the side. Further, a connecting portion 102a for connecting the upper cushioning rubber 90 and the movable film 88, and a connecting portion 102b for connecting the lower cushioning rubber 92 and the movable membrane 88 are provided at both ends of the film portion 94 facing in the radial direction. The upper buffer rubber 90 extending from the protruding tip of the connecting portion 102a and the lower buffer rubber 92 extending from the protruding tip of the connecting portion 102b spread so as to extend toward opposite sides in the radial direction.

  The elastic movable body 86 is disposed in the accommodation space 78 of the partition member 48. That is, the movable film 88 is disposed in the axial center portion of the accommodating space 78 having a large diameter, and the outer peripheral end is sandwiched between the opposing surfaces of the upper clamping surface 64 and the lower clamping surface 72. . On the other hand, the upper shock absorbing rubber 90 is disposed at the upper end in the axial direction of the accommodating space 78 having a small diameter, and is superimposed on the wall inner surface 104 of the accommodating space 78 on the pressure receiving chamber 80 side. Is disposed at the lower end in the axial direction of the accommodating space 78 having a small diameter, and is superimposed on the wall inner surface 106 of the accommodating space 78 on the equilibrium chamber 82 side.

  Further, the locking projections 98 of the upper cushioning rubber 90 are inserted into the locking holes 108 penetrating the partition member main body 50 and locked, and the locking projections 98 of the lower cushioning rubber 92 are fixed to the bottom plate member. 52 is inserted and locked in a locking hole 110 penetratingly formed in 52. As a result, the upper and lower cushioning rubbers 90 and 92 are held in a state where the longitudinal ends opposite to the connection side to the coupling portions 102 a and 102 b are also superimposed on the wall inner surfaces 104 and 106 of the accommodation space 78. ing. In this embodiment, the locking projection 98 is locked in the circumferential direction by being inserted into the locking hole 110, and the upper and lower shock absorbing rubbers 90 and 92 and the movable film 88 formed integrally therewith are provided. Positioning means for positioning in the circumferential direction with respect to the partition member 48 is configured.

  The accommodation space 78 communicates with the pressure receiving chamber 80 through the upper through hole 58 and also communicates with the equilibrium chamber 82 through the lower through hole 74, so that the hydraulic pressure of the pressure receiving chamber 80 is on the upper surface of the movable film 88. In addition, the hydraulic pressure of the equilibrium chamber 82 is exerted on the lower surface of the movable film 88. Thus, when a relative pressure fluctuation occurs between the pressure receiving chamber 80 and the equilibrium chamber 82 due to vibration input, the movable film 88 is slightly deformed so that the hydraulic pressure in the pressure receiving chamber 80 is transmitted to the equilibrium chamber 82. Thus, a hydraulic pressure transmission mechanism is configured.

  Furthermore, the inner wall surfaces 104 and 106 of the accommodation space 78 with which the movable film 88 abuts by elastic deformation at the time of vibration input are covered with upper and lower cushioning rubbers 90 and 92, and the movable film 88 is the wall of the accommodation space 78. The inner surfaces 104 and 106 are brought into contact with upper and lower cushioning rubbers 90 and 92, respectively.

  In the engine mount 10 having such a structure, the first attachment member 12 is attached to a power unit (not shown), and the second attachment member 14 is attached to a vehicle body (not shown) via a bracket 44. The power unit is connected to the vehicle body in a vibration-proof manner.

  When a low-frequency large-amplitude vibration corresponding to an engine shake is input between the first mounting member 12 and the second mounting member 14 in such a vehicle mounted state, the relative pressure between the pressure receiving chamber 80 and the equilibrium chamber 82 is increased. Based on the variation, fluid flow through the orifice passage 85 is induced. As a result, the intended vibration isolation effect (vibration damping effect) is exhibited based on the fluid action such as the resonance action of the fluid.

  In addition, when the low-frequency large-amplitude vibration is input, the movable film 88 is pressed against the wall inner surfaces 104 and 106 of the housing space 78 and is substantially restrained, so that the hydraulic pressure transmission exerted in the hydraulic pressure transmission mechanism is achieved. The action is limited. As a result, the internal pressure fluctuation of the pressure receiving chamber 80 is efficiently induced, and the amount of fluid flowing through the orifice passage 85 is sufficiently secured, so that the vibration isolation effect based on the fluid flow action is effectively exhibited. The

  Further, since the shock absorbing rubbers 90 and 92 are superimposed on the wall inner surfaces 104 and 106 of the housing space 78, the impact force when the movable film 88 contacts the wall inner surfaces 104 and 106 of the housing space 78. It is relieved by the buffer rubber 90, 92, and the hitting sound at the time of contact is reduced.

  In this case, the buffer rubbers 90 and 92 are connected to the movable film 88 by connecting portions 102 a and 102 b, and the movable film 88 and the buffer rubbers 90 and 92 are integrally formed as an elastic movable body 86. Thereby, the hitting sound caused by the contact of the movable film 88 with the partition member 48 can be reduced with a small number of parts.

  Further, the buffer rubbers 90 and 92 are supported by the movable film 88 via the connecting portions 102 a and 102 b, and the movable film 88 is not bonded to the wall inner surfaces 104 and 106 of the housing space 78. Since the cushioning rubbers 90 and 92 can be disposed on both the upper and lower sides of the rubber pad, the cushioning rubbers 90 and 92 can be easily disposed.

  In addition, in the present embodiment, the locking protrusions 98 are respectively provided on the end portion of the upper shock absorbing rubber 90 opposite to the connecting portion 102a and the end portion of the lower shock absorbing rubber 92 opposite to the connecting portion 102b. The locking projection 98 is locked to one of the locking holes 108 and 110 of the partition member 48. Thereby, the relative rotation of the upper and lower cushioning rubbers 90 and 92 with respect to the partition member 48 is prevented, and the cushioning rubbers 90 and 92 are positioned and held in a state where they are superimposed on the wall inner surfaces 104 and 106 of the accommodation space 78. In particular, the upper buffer rubber 90 can be prevented from being bent toward the movable film 88 by its own weight.

  In addition, a connecting portion 102 a connected to the upper shock absorbing rubber 90 and a connecting portion 102 b connected to the lower shock absorbing rubber 92 are provided on the outer peripheral portion of the film portion 94 facing in one radial direction. Therefore, the portions of the membrane portion 94 whose rigidity changes due to the formation of the connecting portions 102a and 102b are provided on both sides that are opposed in the radial direction, so that the deformation mode of the membrane portion 94 is stabilized.

  Furthermore, the upper and lower shock absorbing rubbers 90 and 92 are formed so as to extend from the connecting portions 102a and 102b to the opposite side in the radial direction of the movable film 88, respectively. Therefore, the length of the upper and lower cushioning rubbers 90 and 92 can be secured large, and the wall inner surfaces 104 and 106 of the accommodation space 78 can be covered with the cushioning rubbers 90 and 92 over a wide range.

  On the other hand, when medium to high frequency small amplitude vibrations such as idling vibrations and running noises are input, the orifice passage 85 tuned to a frequency lower than the frequency of the input vibrations is substantially blocked by anti-resonance. . Further, since the input vibration has a small amplitude, the movable film 88 is slightly deformed in the thickness direction based on the relative pressure change between the pressure receiving chamber 80 and the equilibrium chamber 82, so that the hydraulic pressure in the pressure receiving chamber 80 is balanced. It is transmitted to the chamber 82 and absorbed by the volume change of the equilibrium chamber 82. Therefore, the high dynamic spring due to the pressure increase in the pressure receiving chamber 80 is prevented, and the intended vibration isolation effect (vibration insulation effect) is exhibited. Note that the film portion 94 of the movable film 88 and the buffer rubbers 90 and 92 spread substantially parallel to each other, and a predetermined gap is formed between the film portion 94 and the buffer rubbers 90 and 92. The minute deformation of the film part 94 occurs without being restricted by the buffer rubbers 90 and 92, so that the hydraulic pressure transmission action is effectively exhibited.

  FIG. 8 shows an engine mount 120 for an automobile as a second embodiment of the fluid filled type vibration damping device structured according to the present invention. In the following description, members and portions that are substantially the same as those in the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  In the engine mount 120 of the present embodiment, the elastic movable body 122 is disposed in the accommodation space 78 of the partition member 48. As shown in FIGS. 9 to 11, the elastic movable body 122 integrally includes a movable film 88, a pair of upper buffer rubbers 124 and 124 and a pair of lower buffer rubbers 126 and 126 as divided buffer rubbers. It is equipped with.

  The upper shock absorbing rubber 124 is a long-plate-shaped rubber elastic body extending in the vertical direction, and is integrally connected to the outer peripheral portion of the upper surface of the film portion 94 in the movable film 88 via the connecting portion 102a. In short, a plate-like rubber elastic body integrally formed upward from the upper surface of the movable film 88 protrudes, and its base end portion is a connecting portion 102a and extends further upward from the connecting portion 102a. The leading end portion is an upper cushion rubber 124. In addition, a pair of upper cushioning rubbers 124 are provided so as to face each other in one radial direction, and the upper cushioning rubbers 124 and 124 are arranged so that the protruding tips of the pair of upper cushioning rubbers 124 and 124 do not come into contact with each other after the collapse deformation described later. The protruding heights of the buffer rubbers 124 and 124 and the distance between the facings in the radial direction are set.

  The lower buffer rubber 126 is a long-plate-shaped rubber elastic body extending in the vertical direction, like the upper buffer rubber 124, and is integrally connected to the outer peripheral portion of the lower surface of the film portion 94 in the movable film 88 via the connecting portion 102 b. Has been. In short, a plate-like rubber elastic body integrally formed downward from the lower surface of the movable film 88 protrudes, and its base end portion is a connecting portion 102b, and extends further downward from the connecting portion 102b. The leading end portion is a lower cushion rubber 126. In addition, a pair of the lower cushioning rubbers 126 are provided to face each other in one radial direction. The protruding heights of the buffer rubbers 126 and 126 and the distance between the facings in the radial direction are set. The pair of upper cushioning rubbers 124 and 124 and the pair of lower cushioning rubbers 126 and 126 are formed so as to protrude toward the opposite sides at the same position.

  The elastic movable body 122 having such a structure is disposed in the accommodation space 78 of the partition member 48. In this case, the upper buffer rubber 124 and the lower buffer rubber 126 are connected to each connecting portion 102 as shown by an arrow and a two-dot chain line in FIG. 11 when the elastic movable body 122 is disposed in the accommodation space 78. By being elastically deformed, it is overlapped with the wall inner surfaces 104 and 106 of the accommodation space 78 in a state of falling inward in the radial direction and spreading substantially parallel to the film portion 94 of the movable film 88 (see FIG. 8). It should be noted that the upper buffer rubber 124 and the lower buffer rubber 126 fall down when the elastic movable body 122 is disposed in the housing space 78, so that the upper buffer rubber 124 and the lower buffer rubber 126 are connected to the inner wall surface 104 of the housing space 78. , 106 is realized.

  In the engine mount 120 having the structure according to the present embodiment as well, as in the first embodiment, the hitting sound caused by the movable film 88 coming into contact with the wall inner surfaces 104 and 106 of the housing space 78 is reduced in the number of parts. Can be reduced.

  In addition, the elastic movable body 122 of the present embodiment is elastic because the upper and lower cushioning rubbers 124 and 126 protrude linearly in the vertical direction in the single elastic movable body 122 before being disposed in the accommodation space 78. The movable body 122 can be formed by a simple mold structure that is divided into two parts, and can be manufactured inexpensively and efficiently.

  Further, on the upper surface of the movable film 88, a pair of connecting portions 102a, 102a is provided in an outer peripheral portion facing in one direction in the radial direction, and a pair of upper cushioning rubbers 124, 124 are disposed facing in the radial direction. . Thereby, the wall inner surface 104 on the pressure receiving chamber 80 side of the accommodation space 78 can be covered over a wide range while reducing the length of each upper buffer rubber 124. Similarly, a pair of lower cushioning rubbers 126 and 126 are disposed so as to face each other in the radial direction, and the inner surface 106 of the accommodation space 78 on the side of the equilibrium chamber 82 is reduced while the length of the lower cushioning rubber 126 is reduced. It can be covered over a wide range. In addition, since the length of the upper and lower cushioning rubbers 124 and 126 is reduced, it is excellent in demolding property after molding, and can be easily removed from the mold without causing damage such as cutting.

  Note that, as in the elastic movable body 130 shown in FIG. 12, the coupling portion 132 is made sufficiently thin so that the coupling portion 132 can be more easily elastically deformed than the upper and lower cushioning rubbers 124, 126. 124 and 126 can be easily fallen. Note that the thickness of the connecting portion 132 is not particularly limited, and may be an extremely thin burr shape or may be a thin plate shape as compared with the buffer rubbers 124 and 126. Further, in the present embodiment, the groove-shaped curving portion that opens radially inward is formed, so that the connecting portion 132 is thinned. However, the connecting portion 132 is open to the radially outer side and both the radially inner and outer sides. The connecting portion may be made thin by forming the straight portion.

  In addition, when the upper and lower cushioning rubbers 124 and 126 are pressed against the wall inner surfaces 104 and 106 of the housing space 78 and fall down so as to spread substantially parallel to the movable film 88, the upper and lower cushioning rubbers 124 and 126 are inside. In order to make it easy to fall down to the peripheral side, the protruding tip surfaces of the upper and lower cushioning rubbers 124 and 126 are configured as inclined surfaces, or the entire upper and lower cushioning rubbers 124 and 126 are inclined inward toward the protruding tip in advance toward the inner peripheral side. You may form as follows.

  FIG. 13 shows an engine mount 140 for an automobile as a third embodiment of the fluid filled type vibration damping device structured according to the present invention. In the engine mount 140, the elastic movable body 142 and the lower shock absorbing rubber 144 are accommodated in the accommodation space 78 of the partition member 48.

  The elastic movable body 142 has a structure in which the lower buffer rubber 92 and the connecting portion 102b connected thereto are removed from the elastic movable body 86 shown in the first embodiment. 90 is integrated with the connecting portion 102a.

  The lower shock absorbing rubber 144 is a rubber elastic body having a substantially rectangular plate shape that is a separate body from the elastic movable body 142, and is integrally formed with a locking protrusion 146 that protrudes downward. The locking projection 146 has a base (upper part) 148 having a substantially constant rectangular cross section, and an end (lower part) 150 having a substantially quadrangular truncated pyramid shape in the reverse direction. Since the radial side end portion has a larger cross-sectional shape than the base portion 148, the locking step portion 152 is formed.

  The elastic movable body 142 is disposed in the upper housing recess 62, the outer peripheral clamping portion 96 of the movable film 88 is clamped between the partition member main body 50 and the bottom plate member 52, and the upper shock absorbing rubber 90 is The upper housing recess 62 is overlaid on the wall inner surface 104 on the pressure receiving chamber 80 side. Further, the lower shock absorbing rubber 144 is disposed in the lower receiving recess 70, and the locking projection 146 is inserted and locked into the locking hole 110 formed through the bottom wall portion of the lower receiving recess 70. As a result, it is positioned with respect to the bottom plate member 52.

  Thus, even in the structure in which the lower shock absorbing rubber 144 is separated from the elastic movable body 142, the hitting sound when the movable film 88 contacts the wall inner surfaces 104 and 106 of the accommodation space 78 is effectively reduced. In addition, since the upper cushioning rubber 90 is integrally formed with the movable film 88, the number of parts can be reduced as compared with the case where the upper and lower cushioning rubbers are provided separately from the movable film 88.

  The elastic movable body may have a structure in which the movable film 88 and the lower buffer rubber 92 are integrally formed via the connecting portion 102b, and the upper buffer rubber may be provided separately from the elastic movable body. In short, in the structure according to the present invention, it is only necessary that at least one of the upper cushioning rubber and the lower cushioning rubber is formed integrally with the movable film 88, and both the cushioning rubbers are not necessarily integrated with the movable film 88. .

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in the above-described embodiment, the connecting portion 102 is provided in the outer peripheral portion of the film portion 94 of the movable film 88, but the connecting portion may be provided in the central portion in the radial direction of the movable film 88. Thus, when providing a connection part in the center part of radial direction, a buffer rubber has sufficient length by being formed so that it may extend toward an outer peripheral side at least in the arrangement | positioning state to the accommodation space 78. It is ensured and can be overlapped with the wall inner surfaces 104, 106 of the accommodation space 78 in a wide range.

  The buffer rubber is not limited to the one extending in the radial direction, and may extend in a direction perpendicular to the axis other than the radial direction.

  Further, the buffer rubber is not limited to the one that extends in the direction substantially perpendicular to the axis parallel to the movable film 88 and the one that extends in the direction substantially perpendicular to the movable film 88, for example, the protruding tip side (the connecting portion) (The end on the opposite side) may be inclined and spread away from the movable film 88 gradually. According to this, the shock absorbing rubber can be pressed against the wall inner surfaces 104 and 106 of the accommodation space 78 based on elasticity, and durability is prevented by preventing excessive deformation in the arrangement state in the accommodation space 78. Can be improved.

  In the first and third embodiments, the locking protrusions 98 formed integrally with the buffer rubbers 90 and 92 are inserted into the locking holes 108 and 110 formed in the partition member 48 as positioning means. Although a stopped structure is illustrated, the positioning means should not be construed as limited by such illustration. That is, for example, a partially enlarged diameter portion is provided on the circumference of the accommodation space 78 and a large diameter portion that partially protrudes to the outer circumference side is provided on the circumference of the outer circumference clamping portion 96 of the movable film 88, Positioning means for positioning the movable film 88 with respect to the partition member 48 may be configured by fitting the diameter portion into the enlarged diameter portion.

  Further, in the structure of the second embodiment, four upper cushioning rubbers 124 and four lower cushioning rubbers 126 are provided at equal intervals on the circumference, and upper and lower crosspieces 60 and 76 that exhibit a substantially cross-shaped shape when viewed in the axial direction. Can be covered with the buffer rubbers 124 and 126 over substantially the whole.

10, 120, 140: engine mount (fluid-filled vibration isolator), 12: first mounting member, 14: second mounting member, 16: main rubber elastic body, 38: flexible membrane, 48: partition Member, 78: accommodation space, 80: pressure receiving chamber, 82: equilibrium chamber, 85: orifice passage, 86, 122, 130, 142: elastic movable body, 88: movable film, 90, 124: upper buffer rubber (buffer rubber) ), 92, 126: Lower shock absorbing rubber (buffer rubber), 98: Locking protrusion (positioning means), 102, 132: Connecting part, 104, 106: Wall inner surface, 108, 110: Locking hole (positioning means)

Claims (9)

The first mounting member and the second mounting member are elastically connected by a main rubber elastic body, and a part of the wall portion is on one side of the partition member supported by the second mounting member. A pressure receiving chamber formed of a main rubber elastic body is formed, and an equilibrium chamber in which a part of the wall portion is formed of a flexible film is formed on the other side, and the pressure receiving chamber and the equilibrium chamber are further formed. And a movable membrane is disposed in the accommodation space formed in the partition member, and the hydraulic pressure of the pressure receiving chamber and the equilibrium chamber are formed on both sides of the movable membrane. In the fluid-filled type vibration isolator to which one of the hydraulic pressures is exerted,
A cushioning rubber provided on the inner surface of the wall of the housing cavity and covering the striking surface of the movable film is integrally formed with the movable film with a connecting portion to the movable film, and is superimposed on the inner surface of the wall of the housing space. A fluid-filled vibration isolator characterized by being arranged.   The buffer rubber is integrally formed on both surfaces of the movable membrane, and the buffer rubber is disposed so as to be overlapped on the inner wall surface on the pressure receiving chamber side and the inner wall surface on the equilibrium chamber side of the accommodation space. The fluid-filled vibration isolator according to claim 1.   In at least one of the inner wall surface on the pressure receiving chamber side and the inner wall surface on the equilibrium chamber side of the accommodation space, the buffer rubbers arranged to overlap the inner wall surface are integrally formed with the movable film, respectively. The fluid-filled vibration isolator according to claim 1 or 2, comprising a plurality of divided cushion rubbers.   The fluid-filled vibration isolator according to any one of claims 1 to 3, further comprising positioning means for positioning the movable film with respect to the partition member in a circumferential direction.   The coupling part is formed to protrude outward in the thickness direction from the movable film, and the buffer rubber is formed in a state of being bent from the projecting tip of the coupling part and extending in parallel with the movable film. Item 5. The fluid filled type vibration damping device according to any one of Items 1 to 4.   The fluid according to claim 5, wherein the connecting portion projects from an outer peripheral portion of the movable film, and the buffer rubber extends from the connecting portion toward the opposite side in the radial direction of the movable film. Enclosed vibration isolator. The buffer rubber facing the one surface of the movable film, and the buffer rubber facing the other surface of the movable film,
It is provided with the two connecting portions projecting to opposite surfaces from both edge portions opposed to each other in the radial direction of the movable film, and extends so as to extend in opposite directions in the radial direction of the movable film. Item 7. The fluid-filled vibration isolator according to Item 6.   The shock absorbing rubber is integrally formed in the movable film so as to protrude further outward from the connecting portion, and the shock absorbing rubber is arranged on the inner surface of the housing cavity by disposing the movable film in the housing cavity. The fluid-filled vibration isolator according to any one of claims 1 to 4, wherein the fluid-filled vibration isolator is superimposed on a wall inner surface of the housing space in a state of being pressed against the wall.   The fluid filled type vibration damping device according to claim 8, wherein the connecting portion is more easily elastically deformed than the buffer rubber.

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