JP6047447B2 - Fluid filled vibration isolator - Google Patents

Description

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

  2. Description of the Related Art Conventionally, there has been known a vibration isolator that is interposed between members constituting a vibration transmission system and that mutually antivibrates and connects these members, and one type is a fluid filled type vibration isolator. The fluid-filled vibration isolator includes a first attachment member attached to one member constituting the vibration transmission system and a second attachment member attached to the other member constituting the vibration transmission system. It has a structure that is elastically connected by the body. Further, on either side of the partition member supported by the second mounting member, one of a main liquid chamber and a sub liquid chamber each filled with an incompressible fluid is formed.

  Moreover, in the fluid filled type vibration isolator, for the purpose of improving the vibration isolating performance in a high frequency range, etc., as disclosed in JP 2009-2420 A (Patent Document 1), the fluid-filled anti-vibration device is effective in absorbing the hydraulic pressure of the movable film. In some cases, the anti-vibration effect is used. That is, the movable film supported at the outer peripheral portion is accommodated in the accommodating space formed inside the partition member, and the liquid pressure of one of the main liquid chamber and the sub liquid chamber is exerted on both surfaces of the movable film. Therefore, when the relative pressure variation between the main liquid chamber and the sub liquid chamber occurs, the intended vibration isolation effect is exhibited based on the hydraulic pressure absorbing action due to the minute deformation of the movable film.

  By the way, for example, when the valve part which opens and closes the short circuit passage is partially provided on the circumference with respect to the movable film as in Patent Document 1, the orientation of the movable film in the circumferential direction with respect to the partition member Must be set appropriately. Therefore, in Patent Document 1, a super-thick part protruding to the outer peripheral side is partially formed on the circumference in the movable film, and the super-thick part extends to the outer peripheral side on the circumference of the accommodation space. The movable film is aligned in the circumferential direction with respect to the partition member.

  However, if there are recesses other than the storage recesses that extend to the outer periphery on the periphery of the storage space for the purpose of lightening for weight reduction or the formation of a short-circuit passage for preventing cavitation, etc. If the ultra-thick part is accidentally inserted into the recess, the movable film may be assembled in the wrong circumferential direction with respect to the partition member.

JP 2009-2420 A

  The present invention has been made in the background of the above-described circumstances, and the solution is to provide a fluid sealing with a novel structure in which the movable membrane can be assembled in a specific direction with respect to the partition member with a simple structure. It is to provide a vibration isolator.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  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 main liquid chamber and a sub liquid chamber are formed, and an incompressible fluid is sealed in the main liquid chamber and the sub liquid chamber, and an outer peripheral portion is formed in the accommodation space formed inside the partition member. A fluid-filled vibration isolating device in which a movable film supported by the partition member is disposed, and one of the liquid pressure of the main liquid chamber and the liquid pressure of the sub liquid chamber is exerted on both surfaces of the movable film In the movable film, alignment protrusions that protrude to the outer peripheral side are formed, and alignment recesses that extend to the outer peripheral side are formed on the periphery of the accommodation cavity, The movable projection is inserted into the alignment recess of the partition member so that the movable film is the partition member. On the other hand, while being aligned in the circumferential direction, a recess-shaped enlarged portion that extends to the outer peripheral side is formed at a portion outside the alignment recess on the periphery of the accommodation cavity, An abutting protrusion is provided on the inner surface of the enlarged diameter portion, and an erroneous assembly preventing means for preventing the alignment protrusion from being inserted into the enlarged diameter portion by contacting the alignment protrusion with the corresponding abutting protrusion. It is characterized in that is configured.

  According to the fluid-filled vibration isolator having the structure according to the first aspect, when the movable film is disposed in the accommodation space of the partition member, the alignment protrusion is inserted into the alignment recess. Thus, the movable film can be easily aligned in the circumferential direction with respect to the partition member and assembled in a predetermined direction in the circumferential direction.

  In addition, a contact projection is formed on the enlarged diameter portion formed for the purpose of forming a short-circuit path or lightening for weight reduction, and the contact between the alignment projection and the contact projection. The alignment protrusion is prevented from being erroneously inserted into the enlarged diameter portion. Therefore, even with a structure in which a recess-shaped enlarged diameter portion is provided in addition to the alignment recess on the circumference of the accommodation cavity, the movable film is aligned in the correct direction in the circumferential direction with respect to the partition member. Can be attached.

  According to a second aspect of the present invention, in the fluid-filled vibration isolator described in the first aspect, the alignment protrusion is formed in an asymmetric shape in the circumferential direction, and The shapes are different from each other, and the alignment recess has a circumferentially asymmetric shape corresponding to the alignment protrusion.

  According to the second aspect, since the alignment protrusion and the alignment recess have a circumferentially asymmetric shape in which the inclination angles of both circumferential surfaces are different from each other, the alignment protrusion is inserted into the alignment recess. Thus, the movable film is aligned with the partition member in the circumferential direction, and the movable film is attached to the partition member with its front and back surfaces being defined in a predetermined direction. In particular, since the circumferential direction and front and back of the movable film with respect to the partition member are set by the shape of the alignment protrusion and the alignment recess, the movable film does not require a plurality of alignment protrusions and alignment recesses. Can be attached to the partition member in the correct front and back direction.

  In addition, if the alignment protrusions and the alignment recesses have a circumferentially asymmetric shape by making the inclination angles of the circumferential side surfaces of the alignment protrusions and the alignment recesses different from each other, the alignment protrusions and the alignment recesses The shape of the alignment protrusion and the alignment recess can be simplified as compared with the case where a step, a protrusion, a recess, or the like is provided on both sides in the circumferential direction to realize an asymmetric shape in the circumferential direction.

  According to a third aspect of the present invention, in the fluid-filled vibration isolator described in the first or second aspect, the partition member has a structure in which a lid member and a partition member main body are overlapped. The opening of the housing recess formed in the member main body is covered with the lid member to form the housing cavity, while the abutting toward the lid member from the bottom surface at the outer peripheral end of the enlarged diameter portion. The projecting portion is formed to project, and the corresponding projecting projecting portion is provided with a tapered surface inclined downward toward the inner peripheral side, and the inner surface of the peripheral wall of the enlarged diameter portion is constituted by the tapered surface, The erroneous assembly preventing means is configured by the abutment of the alignment protrusion on the tapered surface.

  According to the third aspect, since the taper surface of the abutment protrusion constitutes the inner surface of the peripheral wall of the enlarged diameter portion, the taper surface is a removal taper for demolding when the partition member body having the enlarged diameter portion is molded. Since the mold can be easily removed, the manufacture becomes easy.

  In addition, when the alignment protrusion is accidentally inserted into the enlarged diameter portion, the alignment protrusion of the movable film abuts against the tapered surface of the abutment protrusion, preventing damage to the alignment protrusion due to contact with the corner. Can be done.

  In addition, when the enlarged diameter portion constitutes a part of a short-circuit passage (described later) that allows the main liquid chamber and the equilibrium chamber to communicate with each other, the inner surface of the peripheral wall of the enlarged diameter portion is configured by a taper surface. Since the flow of the flow becomes smooth and a large cross-sectional area of the passage is secured and the flow resistance of the short-circuit passage is reduced, cavitation noise can be effectively prevented.

  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, the main liquid chamber includes a part of the wall portion made of the main rubber elastic body. And the auxiliary liquid chamber is an equilibrium chamber in which a part of the wall portion is formed of a flexible film. When the pressure receiving chamber is depressurized, the pressure receiving chamber and the equilibrium chamber are separated from each other. A short-circuit passage that communicates with each other is developed using the enlarged-diameter portion, and the movable film is provided with a valve portion that switches the short-circuit passage between a communication state and a cutoff state. is there.

  According to the fourth aspect, when the pressure receiving chamber is decompressed, the fluid flows from the equilibrium chamber to the pressure receiving chamber through the short-circuit passage, whereby the negative pressure in the pressure receiving chamber is reduced as quickly as possible, and a difference caused by cavitation occurs. Sound is reduced. In addition, since the short-circuit passage includes the diameter-expanded portion, the valve portion that switches the short-circuit passage between the communication state and the cutoff state can be easily formed using the movable film. In addition, when the movable membrane is provided with the valve portion as described above, the movable projection is inserted into the alignment recess so that the movable membrane is aligned with the partition member in the circumferential direction. The part can be easily aligned with the short-circuit path.

  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 alignment protrusion is formed at one place on the circumference of the movable film. And the alignment recess is formed at one location on the circumference of the accommodation space.

  According to the 5th aspect, the weight reduction of a movable film | membrane is achieved by using the one alignment protrusion. On the other hand, since the number of the alignment recesses is one, the portion of the peripheral wall of the accommodation space that is thinned by the formation of the alignment recesses is reduced, and the rigidity of the partition member can be sufficiently ensured. According to the present invention, the alignment of the movable film in the circumferential direction with respect to the partition member is effectively realized by fitting the pair of alignment protrusions and the alignment recesses. Moreover, if the second mode is adopted in combination, the movable film is not only aligned with the partition member in the circumferential direction by a set of alignment protrusions and alignment recesses, but also defines the front and back of the movable film. can do.

  According to a sixth aspect of the present invention, in the fluid-filled vibration isolator described in any one of the first to fifth aspects, an orifice passage is formed to communicate the main liquid chamber and the sub liquid chamber with each other. In addition, the orifice passage is positioned away from the enlarged diameter portion in the circumferential direction.

  According to the sixth aspect, the intended vibration isolation effect can be obtained based on the resonance action of the fluid flowing through the orifice passage. Moreover, since the orifice passage is formed at a position away from the enlarged diameter portion in the circumferential direction, the radial dimension of the enlarged diameter portion is not limited by the formation of the orifice passage, and the passage sectional area of the short-circuit passage is reduced. It is possible to obtain effects such as prevention of cavitation by securing and weight reduction by removing meat.

  According to the present invention, the movable film is aligned in the circumferential direction with respect to the partition member by inserting the alignment protrusion of the movable film into the alignment recess of the partition member. In addition, a contact protrusion protrudes from the inner surface of the enlarged diameter portion formed on the partition member, and the alignment protrusion is inserted into the enlarged diameter portion by the contact protrusion contacting the alignment protrusion. This prevents the movable film from being attached to the partition member in the wrong direction in the circumferential direction.

It is a longitudinal cross-sectional view which shows the engine mount as 1st embodiment of this invention, Comprising: The figure equivalent to the II cross section of FIG. The perspective view which shows the partition member which comprises the engine mount shown by FIG. 1 from the viewpoint from front diagonally upward. The top view of the partition member shown by FIG. The disassembled perspective view of the partition member shown by FIG. The perspective view which shows the state which attached the movable film to the partition member main body which comprises the partition member shown by FIG. 2 in the correct direction. The top view which shows the partition member main body and movable film | membrane which were shown by FIG. The perspective view which shows the state which tried to attach the movable film to the partition member main body which comprises the partition member shown by FIG. 2 in the wrong direction. The top view which shows the partition member main body and movable film | membrane which were shown by FIG. The longitudinal cross-sectional view which shows the partition member main body and movable film | membrane shown by FIG. The longitudinal cross-sectional view which shows the state in which the big negative pressure was exerted on the pressure receiving chamber in the engine mount shown by FIG. The longitudinal cross-sectional view which shows the engine mount as 2nd embodiment of this invention. The longitudinal cross-sectional view which shows the state which tried to attach a movable film to the partition member main body which comprises the engine mount shown by FIG. 11 in the wrong direction.

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

  FIG. 1 shows an engine mount 10 as a first embodiment of a fluid-filled vibration isolator 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, which is the main vibration input direction.

  More specifically, the first attachment member 12 is a high-rigidity member having a small-diameter, generally cylindrical shape, and has a tapered shape in which the lower portion gradually decreases in diameter toward the lower side. Further, the first mounting member 12 is formed with a screw hole 18 extending vertically on the central axis and opening on the upper surface.

  The second attachment member 14 is a highly rigid member having a thin, large-diameter, generally cylindrical shape. The upper end portion is integrally formed with a flange portion 20 that protrudes toward the outer peripheral side, and the lower end portion is an inner peripheral portion. The inner flange-shaped retaining projection 22 is bent to the side.

  The first mounting member 12 and the second mounting member 14 are arranged on the same central axis, and the first mounting member 12 and the second mounting member 14 are elastically connected by the main rubber elastic body 16. Yes. The main rubber elastic body 16 has a thick, substantially truncated cone shape, and the first attachment member 12 is vulcanized and bonded to the small-diameter side end portion, and the large-diameter side end portion has the second outer peripheral surface. The attachment member 14 is vulcanized and bonded. The main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting member 12 and the second mounting member 14.

  Further, the main rubber elastic body 16 is formed with a large-diameter recess 24 that opens to the large-diameter side end face. The large-diameter recess 24 has an inverted, generally mortar shape that gradually expands downward, and is formed in the central portion of the main rubber elastic body 16 in the radial direction. Furthermore, a seal rubber layer 26 is formed on the outer peripheral side of the large-diameter recess 24 so as to protrude downward. The seal rubber layer 26 has a thin and large-diameter, generally cylindrical shape, is integrally formed with the main rubber elastic body 16, and is fixed to the inner peripheral surface of the second mounting member 14.

  A flexible film 28 is attached to the lower end portion of the second attachment member 14. The flexible film 28 is a thin rubber film having a substantially disk shape, and has a slack shape so that it can be easily deformed. Further, a fixing member 30 is vulcanized and bonded to the outer peripheral surface of the flexible film 28. The fixing member 30 is a thin, large-diameter, generally annular or cylindrical member, and is a highly rigid member made of metal or the like. Then, the fixing member 30 is inserted into the lower end portion of the second mounting member 14 and pressed against the second mounting member 14 by a diameter reduction process such as an eight-way drawing, and the retaining protrusion 22 is formed on the lower surface of the fixing member 30. The flexible film 28 is attached to the second attachment member 14 by preventing the fixing member 30 from coming off downward.

  When the flexible film 28 is attached to the second attachment member 14, a fluid chamber 32 separated from the external space is formed between the main rubber elastic body 16 and the flexible film 28 in the axial direction. And an incompressible fluid is enclosed. The incompressible fluid sealed in the fluid chamber 32 is not particularly limited, but for example, water, alkylene glycol, polyalkylene glycol, silicone oil, or a mixture thereof is desirable. More preferably, a low-viscosity fluid of 0.1 Pa · s or less is employed in order to efficiently obtain a vibration-proofing effect based on the fluid flow action described later.

  A partition member 34 is disposed in the fluid chamber 32. As shown in FIG. 2, the partition member 34 has a structure in which a lid member 36 and a partition member main body 38 are vertically stacked. The lid member 36 is a hard member having a thin, substantially annular plate shape, and an upper through hole 40 penetrating vertically is formed in a central portion in the radial direction, and an opening peripheral portion of the upper through hole 40 is formed. The upper locking projection 42 projecting downward is formed over the entire circumference. Furthermore, a plurality of small-diameter circular insertion holes 44 are formed in the outer peripheral portion of the lid member 36.

  The partition member main body 38 has a thick, substantially disk shape, and is formed of a metal such as an aluminum alloy, a hard synthetic resin, or the like. Further, a circumferential groove 46 is formed in the outer peripheral portion of the partition member main body 38 and opens in the outer peripheral surface and extends in the circumferential direction with a length of a little less than one round. A plurality of welding pins 48 projecting upward are integrally formed on the outer peripheral portion of the partition member main body 38.

  Further, a housing recess 50 is formed in the central portion in the radial direction of the partition member main body 38 and extends upward and downward with a substantially circular cross section and opens to the upper surface. Furthermore, a circular lower through hole 52 is formed on the bottom surface of the housing recess 50 so as to penetrate the central portion in the radial direction in the vertical direction. A protrusion 54 is formed. The lower locking projection 54 extends with a length less than one round, and a communication port 56 is formed between the circumferential ends. Further, a part of the circumference of the housing recess 50 is formed with an enlarged diameter portion 58 that extends to the outer peripheral side. The enlarged diameter portion 58 is a notch-like recess that opens in the peripheral wall surface of the housing recess 50 and the upper surface of the partition member main body, and is formed at a position corresponding to the communication port 56 on the periphery. In the present embodiment, the circumferential groove 46 is positioned away from the enlarged diameter portion 58 in the circumferential direction.

  Then, the lid member 36 is overlaid on the upper surface of the partition member main body 38, and the distal end portion of the welding pin 48 is melted in a state where the welding pin 48 of the partition member main body 38 is inserted into the insertion hole 44 of the lid member 36. The lid member 36 and the partition member main body 38 are fixed to each other by being fixed to the opening peripheral edge of the insertion hole 44. By fixing the lid member 36 and the partition member main body 38 in this way, the opening of the accommodation recess 50 of the partition member main body 38 is covered with the lid member 36, and the gap between the lid member 36 and the partition member main body 38 is covered. An accommodation space 60 is formed in the interior.

  A movable film 62 is disposed in the accommodation space 60. The movable film 62 is formed of a substantially disc-shaped rubber elastic body, and an upper support protrusion 64 that protrudes upward and extends in the circumferential direction with a length of a little less than one round is integrally formed at the outer peripheral end thereof. In addition, a lower support protrusion 66 that protrudes downward and continues over the entire circumference is integrally formed. A region where the upper support protrusion 64 is displaced in the circumferential direction on the periphery of the movable film 62, in other words, between the circumferential end portions of the upper support protrusion 64 extending in the circumferential direction with a length of a little less than one turn is a valve. Portion 68.

  The movable film 62 is inserted into the housing recess 50 of the lower partition member main body 38, and the outer peripheral end portion in which the upper and lower support protrusions 64 and 66 are formed by fixing the lid member 36 to the partition member main body 38. Is sandwiched between the axially opposed surfaces of the partition member main body 38 and the lid member 36. Further, the upper support protrusion 64 is inserted between the peripheral wall of the receiving recess 50 and the upper locking protrusion 42, and the lower support protrusion 66 is formed between the peripheral wall of the receiving recess 50 and the lower locking protrusion 54. By being inserted between them, the outer peripheral end of the movable film 62 is positioned in the radial direction with respect to the partition member main body 38 and the lid member 36.

  Here, the movable film 62 is aligned in the circumferential direction with respect to the partition member 34 and is attached in a predetermined direction, and is prevented from being attached to the partition member 34 in the upside down direction. It has become. That is, as shown in FIGS. 5 and 6, the alignment protrusion 70 formed on the movable film 62 is inserted into the alignment recess 72 formed on the partition member main body 38, so that the movable film 62 is separated from the partition member. 34 can be attached in the correct orientation.

  The alignment protrusion 70 is integrally formed at one location on the periphery of the movable film 62 and protrudes to the outer peripheral side. The outer peripheral end of the movable film 62 is provided with upper and lower support protrusions 64 and 66 to be thick. Are formed with the same thickness. Further, the alignment protrusions 70 are asymmetric in the circumferential direction, and the shapes of both side surfaces of the alignment protrusions 70 in the circumferential direction are different from each other. In this embodiment, both side surfaces of the alignment protrusions 70 in the circumferential direction are aligned. The protrusions 70 spread at different inclination angles with respect to the protruding direction of the protrusion 70. More specifically, in this embodiment, one circumferential surface 74 substantially coincides with the protruding direction of the alignment protrusion 70, in other words, an inclination angle of approximately 0 ° with respect to the protruding direction of the alignment protrusion 70. And the other circumferential surface 76 spreads with an inclination angle larger than 0 ° and smaller than 90 ° with respect to the protruding direction of the alignment projection 70. Furthermore, the protruding front end surface 78 of the alignment protrusion 70 expands with a predetermined width in the circumferential direction. In the present embodiment, the other circumferential surface 76 of the alignment protrusion 70 extends in the tangential direction of the outer circumferential surface of the movable film 62.

  The alignment recess 72 is formed at one location on the circumference of the receiving recess 50 and extends to the outer peripheral side, and opens to the peripheral wall surface of the receiving recess 50 and opens to the upper surface of the partition member main body 38. doing. Further, the alignment recess 72 has a circumferentially asymmetric shape substantially corresponding to the alignment projection 70 of the movable film 62, and the inclination angle of both circumferential surfaces is different from each other, and the opening side to the accommodation recess 50 It gradually expands in the circumferential direction as it goes to the inner circumference side. The alignment recess 72 is disposed on the circumference of the housing recess 50 at a position away from the enlarged diameter portion 58 in the circumferential direction, and is positioned at the middle portion of the circumferential groove 46 in the circumferential direction. ing.

  When the movable film 62 is inserted into the housing recess 50 of the partition member main body 38, the alignment protrusion 70 of the movable film 62 is inserted into the alignment recess 72 of the partition member main body 38, so that FIG. As shown in FIG. 6, the movable film 62 is aligned with the partition member main body 38 in the circumferential direction. In this case, a contact protrusion 80 is formed on the enlarged diameter portion 58, and the alignment protrusion 70 is prevented from being erroneously inserted into the enlarged diameter portion 58.

  The abutting protrusion 80 is formed integrally with the partition member main body 38, and protrudes into the enlarged diameter portion 58. As shown in FIG. 1, the enlarged diameter portion 58 is provided at the outer peripheral end of the enlarged diameter portion 58. It protrudes upward from the bottom surface of. Further, the contact protrusion 80 of the present embodiment includes a tapered surface 81 that is inclined downward toward the inner peripheral side, and the inner surface of the peripheral wall of the enlarged diameter portion 58 is formed by the tapered surface 81. The tapered surface 81 is formed on the outer peripheral side of the housing recess 50 without reaching the housing recess 50, and the protruding tip of the alignment projection 70 in the state of being disposed in the housing recess 50 of the movable film 62. Extends to the inner peripheral side from a virtual circle passing through (two-dot chain line in FIG. 6). When molding the partition member main body 38, the taper surface 81 constituting the inner surface of the peripheral wall of the enlarged-diameter portion 58 functions as a punch taper when removing the die that is divided into two parts in the vertical direction. Thus, the partition member body 38 can be easily formed.

  By providing such a contact protrusion 80 in the enlarged diameter portion 58, the alignment protrusion 70 of the movable film 62 contacts the tapered surface 81 of the contact protrusion 80, so that the alignment protrusion 70 is expanded. Insertion into the diameter portion 58 is prevented, and the erroneous assembly preventing means of this embodiment is configured. More specifically, as shown in FIGS. 7 to 9, when the alignment protrusion 70 is mistakenly inserted into the enlarged diameter portion 58 of the partition member main body 38, the alignment protrusion 70 of the movable film 62 is brought into contact with the contact protrusion. The lower support protrusion 66 of the movable film 62 to be brought into contact with the intermediate portion of the taper surface 81 of 80 and to be superimposed on the bottom surface of the housing recess 50 is lifted upward in the formation portion of the alignment protrusion 70. . As a result, as shown in FIG. 9, the movable film 62 protrudes upward from the housing recess 50 and the enlarged diameter portion 58 at the portion where the alignment protrusion 70 is formed, and the lid member 36 is overlaid on the upper surface of the partition member main body 38. Since it becomes difficult to match, the manufacturing operator can easily grasp that the movable film 62 is not correctly aligned with the partition member 34. With the above, the erroneous assembly preventing means in the present embodiment is configured. In the present embodiment, since the alignment protrusion 70 of the movable film 62 is in contact with the tapered surface 81 of the contact protrusion 80, damage due to contact of the corner with the alignment protrusion 70, etc. You can prevent problems.

  In addition, in this embodiment, the alignment protrusion 70 of the movable film 62 and the alignment recess 72 of the partition member main body 38 are both asymmetric in the circumferential direction. As a result, when the movable film 62 is to be disposed in the receiving recess 50 of the partition member main body 38 in the reverse direction, the alignment protrusion 70 can be easily placed in the alignment recess 72 even if the circumferential position is correctly aligned. Cannot be inserted. Therefore, by inserting the alignment protrusion 70 into the alignment recess 72, the movable film 62 is easily disposed in the receiving recess 50 of the partition member body 38 with the front and back surfaces and the circumferential direction properly aligned. be able to.

  The partition member 34 having such a structure is disposed in the fluid chamber 32. That is, the partition member 34 is inserted and accommodated in the fluid chamber 32 by being inserted into the second mounting member 14 and having the outer peripheral surface supported by the second mounting member 14. The fluid chamber 32 is vertically divided into two. And, on the upper side across the partition member 34, a part of the wall portion is constituted by the main rubber elastic body 16, and a pressure receiving chamber 82 is formed as a main liquid chamber in which the internal pressure fluctuation is caused. On the lower side of the member 34, a part of the wall portion is formed of the flexible film 28, and an equilibrium chamber 84 is formed as a secondary liquid chamber in which volume change is easily allowed. The pressure receiving chamber 82 and the equilibrium chamber 84 are filled with an incompressible fluid.

  Further, the outer peripheral surface of the partition member 34 is brought into close contact with the inner peripheral surface of the second mounting member 14 via the seal rubber layer 26, so that the outer peripheral opening of the peripheral groove 46 is fluid-tightly sealed by the second mounting member 14. The tunnel-shaped flow path is formed. One end portion in the circumferential direction of the tunnel-shaped flow path communicates with the pressure receiving chamber 82 through the upper communication hole 85, and the other end portion in the circumferential direction communicates with the equilibrium chamber 84 through the lower communication hole (not shown). An orifice passage 86 that connects the pressure receiving chamber 82 and the equilibrium chamber 84 to each other is formed using the circumferential groove 46. In addition, by adjusting the ratio (A / L) of the passage sectional area (A) and the passage length (L) of the orifice passage 86, the tuning frequency of the orifice passage 86 is several Hz corresponding to the engine shake of the automobile. It is set to a low frequency.

  The upper surface of the movable film 62 is subjected to the fluid pressure of the pressure receiving chamber 82 through the upper through hole 40 of the lid member 36, and the lower surface of the movable film 62 is passed through the lower through hole 52 of the partition member main body 38. The fluid pressure in the equilibrium chamber 84 is exerted. As a result, the central portion in the radial direction of the movable film 62 is slightly deformed up and down due to the relative pressure fluctuation between the pressure receiving chamber 82 and the equilibrium chamber 84 at the time of vibration input.

  In addition, a short-circuit opening 88 is formed in a portion of the lid member 36 that covers the enlarged diameter portion 58, and a region between the peripheral end portions of the upper support protrusion 64 at the outer peripheral end portion of the movable film 62 is formed on the upper surface. On the other hand, the hydraulic pressure in the pressure receiving chamber 82 is exerted through the upper through hole 40 and the short-circuit port 88. In the present embodiment, since the orifice passage 86 is positioned away from the enlarged diameter portion 58 in the circumferential direction, the enlarged diameter portion 58 can be formed so as to extend further to the outer peripheral side.

  The engine mount 10 having such a structure is mounted on the vehicle by attaching the first attachment member 12 to the power unit (not shown) and attaching the second attachment member 14 to the vehicle body (not shown). Thus, 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 in such a state of being mounted on a vehicle, fluid flow is generated between the pressure receiving chamber 82 and the equilibrium chamber 84 through the orifice passage 86, and the resonance action of the fluid Based on the fluid action such as the above, the intended vibration isolation effect (vibration damping effect) is exhibited. In addition, when the large amplitude vibration is input, the movable film 62 does not completely follow the input vibration, and the movable film 62 is substantially constrained and the amount of deformation is suppressed, so that the pressure receiving due to the elastic deformation of the movable film 62 is suppressed. The internal pressure fluctuation of the chamber 82 is prevented from being reduced, and the fluid flow through the orifice passage 86 is effectively generated. Further, in the valve portion 68 of the movable film 62, the lower support protrusion 66 is held in contact with the bottom surface of the housing recess 50.

  Further, when a medium to high frequency small amplitude vibration corresponding to idling vibration or traveling noise is inputted, the movable film 62 is slightly deformed up and down by the relative pressure fluctuation between the pressure receiving chamber 82 and the equilibrium chamber 84, and Since the hydraulic pressure of the pressure receiving chamber 82 is transmitted to the equilibrium chamber 84, the internal pressure of the pressure receiving chamber 82 is reduced by the hydraulic pressure absorbing action. This realizes a low dynamic spring based on the fluid pressure absorbing action of the movable film 62, and effectively exerts a target vibration isolation effect (vibration insulation effect). Note that the orifice passage 86 is substantially blocked by anti-resonance when a medium to high-frequency vibration is input.

  Further, when a shocking large load is input and the pressure receiving chamber 82 is suddenly depressurized, fluid flows from the equilibrium chamber 84 to the pressure receiving chamber 82 through the orifice passage 86 and the movable film 62 is drawn into the pressure receiving chamber 82 side. Thus, the pressure drop in the pressure receiving chamber 82 is reduced. Further, since the negative pressure of the pressure receiving chamber 82 acts on the upper surface of the valve portion 68 provided at the outer peripheral end of the movable film 62, the valve portion 68 is sucked toward the pressure receiving chamber 82 as shown in FIG. Thus, the lower support protrusion 66 is spaced upward from the bottom surface of the housing recess 50. Thus, when the pressure receiving chamber 82 is suddenly depressurized, the short-circuit passage 90 that connects the pressure-receiving chamber 82 and the equilibrium chamber 84 to each other with a flow resistance smaller than that of the orifice passage 86 includes the lower through hole 52, the enlarged diameter portion 58, and the short-circuit opening 88 and is expressed. As a result, since the fluid is efficiently supplied from the equilibrium chamber 84 to the pressure receiving chamber 82 through the short-circuit passage 90, the negative pressure in the pressure receiving chamber 82 is quickly reduced, and generation of abnormal noise due to cavitation is avoided. The As is clear from the above description, the short-circuit passage 90 can be switched between communication and blocking by the valve portion 68 according to the internal pressure of the pressure receiving chamber 82. In the present embodiment, the orifice passage 86 is formed away from the enlarged diameter portion 58 in the circumferential direction, and the enlarged diameter portion 58 can be formed so as to extend further to the outer peripheral side. The passage cross-sectional area of the short-circuit passage 90 is ensured to be large, and the cavitation noise is more effectively reduced.

  Here, the alignment projection 70 of the movable film 62 is inserted into the alignment recess 72 of the partition member 34, so that the movable film 62 is aligned with the partition member 34 in the circumferential direction. In addition, a contact protrusion 80 that protrudes from the inner surface of the enlarged diameter portion 58 is formed, and the alignment protrusion 70 is in contact with the contact protrusion 80, so that the alignment protrusion 70 is erroneously applied to the enlarged diameter portion 58. Insertion is prevented. Accordingly, the valve portion 68 of the movable film 62 is aligned in the circumferential direction with respect to the enlarged diameter portion 58 and the communication port 56 in the partition member 34, and the communication and blocking of the short-circuit passage 90 is stabilized by the valve portion 68. Since the switching is performed, it is possible to effectively obtain both the intended image stabilization effect and the noise reduction effect.

  In particular, in this embodiment, the inclination angles of the circumferential protrusions of the alignment protrusion 70 are different from each other, the alignment protrusion 70 is asymmetric in the circumferential direction, and the alignment recess 72 is the alignment protrusion 70. Therefore, the movable film 62 can be attached to the partition member 34 in the correct front and back direction by inserting the alignment protrusion 70 into the alignment recess 72. ing.

  In addition, in the present embodiment, the alignment protrusion 70 and the alignment recess 72 are each asymmetric in the circumferential direction, so that the pair of alignment protrusion 70 and the alignment recess 72 allow the partition member 34 to be separated. Both the circumferential direction and the front and back of the movable film 62 can be set correctly.

  FIG. 11 shows an engine mount 100 for an automobile as a second embodiment of the fluid filled type vibration damping device structured according to the present invention. The engine mount 100 includes a partition member 102 supported by the second mounting member 14. In addition, in the following description, about the member and site | part same as 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in a figure.

  More specifically, the partition member 102 has a structure in which the lid member 36 and the partition member main body 104 are overlapped and fixed to each other. The partition member body 104 includes an alignment recess 72 and an enlarged diameter portion 106 on the circumference of the accommodation recess 50. The enlarged-diameter portion 106 is a notch-shaped recess that extends from the housing recess 50 toward the outer peripheral side, and is open to the inner surface of the peripheral wall of the housing recess 50.

  Further, a contact protrusion 108 is provided in the enlarged diameter portion 106. The abutting protrusion 108 is a protrusion that protrudes from the inner surface of the bottom wall of the enlarged diameter portion 106 toward the opening side (upper side), and is formed at a radially intermediate portion of the enlarged diameter portion 106 in this embodiment. . The contact protrusion 108 may be partially formed in the circumferential direction in the enlarged diameter portion 106, but is preferably formed continuously over the entire length in the circumferential direction.

  In the partition member main body 104 having such a structure, a movable film 62 is disposed with respect to the housing recess 50. In this case, as shown in FIG. 12, the movable film 62 is inserted into the housing recess 50 of the partition member main body 104 in the wrong direction in the circumferential direction, and the alignment protrusion 70 of the movable film 62 is moved to the partition member main body 104. When it is aligned with respect to the enlarged diameter portion 106 in the circumferential direction, an erroneous assembly preventing means is configured by the contact between the alignment protrusion 70 and the contact protrusion 108. Accordingly, in a state where the alignment protrusion 70 is inserted into the enlarged diameter portion 106, it is difficult to overlap and fix the lid member 36 on the upper surface of the partition member main body 104, and the movable film 62 is attached to the partition member 102. On the other hand, it is prevented from being attached in the wrong direction in the circumferential direction.

  As is clear from this embodiment, the structure of the contact protrusion is formed at the outer peripheral end of the enlarged diameter portion 58 as shown in the first embodiment, and constitutes the inner surface of the peripheral wall of the enlarged diameter portion 58. However, the present invention is not limited thereto, and the one formed in the intermediate portion in the radial direction separated from the inner surface of the peripheral wall of the enlarged-diameter portion 106 as shown in the present embodiment can also be adopted. Moreover, as shown in the contact protrusion 108 of this embodiment, the contact protrusion does not have to have a tapered surface.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, a plurality of alignment protrusions and alignment recesses may be provided. Furthermore, a plurality of enlarged diameter portions may be provided.

  Further, the alignment protrusion and the alignment recess are not limited to a shape asymmetric in the circumferential direction, and may be a shape symmetrical in the circumferential direction. In the case of a symmetrical shape in the circumferential direction, it is desirable to prevent the movable film from being reversed and assembled to the partition member by, for example, forming a plurality of sets of alignment protrusions and alignment recesses. .

  In the above embodiment, the enlarged diameter portion constituting the short-circuit passage is exemplified, but the enlarged diameter portion may be, for example, a meat recess or the like formed for the purpose of reducing the weight of the partition member, In that case, it is not necessary to provide the short-circuit port 88 that communicates the expanded diameter portion with the pressure receiving chamber 82, the valve portion 68 of the movable film 62, or the like.

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

10, 100: engine mount, 12: first mounting member, 14: second mounting member, 16: main rubber elastic body, 28: flexible membrane, 34, 102: partition member, 36: lid member, 38 , 104: partition member main body, 50: accommodating recess, 58, 106: enlarged diameter portion, 60: accommodating cavity, 62: movable membrane, 70: alignment protrusion, 72: alignment recess, 74: circumferential direction One surface, 76: the other surface in the circumferential direction, 80, 108: contact protrusion, 81: taper surface, 82: pressure receiving chamber, 84: equilibrium chamber, 86: orifice passage, 90: short circuit passage

Claims (6)

The first mounting member and the second mounting member are elastically connected by a main rubber elastic body, and a main liquid chamber and a sub liquid chamber are formed across a partition member supported by the second mounting member. In addition, an incompressible fluid is sealed in the main liquid chamber and the sub liquid chamber, and a movable membrane supported by the partition member is arranged in the accommodation space formed inside the partition member. A fluid-filled vibration isolator in which each of the liquid pressure of the main liquid chamber and the liquid pressure of the sub liquid chamber is exerted on both surfaces of the movable film;
The movable film is formed with an alignment protrusion that protrudes to the outer peripheral side, and an alignment recess that extends to the outer peripheral side is formed on the periphery of the accommodation space, and the alignment of the movable film While the protrusion is inserted into the alignment recess of the partition member, the movable film is aligned in the circumferential direction with respect to the partition member,
On the periphery of the accommodation space, a portion having the alignment recess is removed, and a concave-shaped enlarged diameter portion is formed extending to the outer peripheral side, and a contact protrusion is formed on the inner surface of the enlarged diameter portion. A misassembly prevention means configured to prevent the insertion of the alignment protrusion into the enlarged-diameter portion by abutment of the alignment protrusion and the corresponding contact protrusion is configured. Fluid-filled vibration isolator.   The alignment protrusion has an asymmetric shape in the circumferential direction, the shape of the alignment protrusion on both sides in the circumferential direction is different from each other, and the alignment recess has a circumferentially asymmetric shape corresponding to the alignment protrusion. The fluid-filled vibration isolator according to claim 1.   The partition member has a structure in which a lid member and a partition member main body are overlapped, and an opening of a housing recess formed in the partition member main body is covered with the lid member to form the housing space. On the other hand, the abutting protrusion is formed so as to protrude from the bottom surface toward the lid member at the outer peripheral end portion of the enlarged diameter portion, and the corresponding protruding protrusion includes a tapered surface inclined downward toward the inner peripheral side. The inner surface of the peripheral wall of the enlarged diameter portion is configured by the tapered surface, and the erroneous assembly preventing means is configured by contact of the alignment protrusion with the tapered surface. 2. The fluid-filled vibration isolator according to 2.   The main liquid chamber is a pressure receiving chamber in which a part of the wall portion is configured by the main rubber elastic body, and the secondary liquid chamber is an equilibrium chamber in which a part of the wall portion is configured by a flexible film; And a short-circuit passage that communicates the pressure-receiving chamber and the equilibrium chamber with each other when the pressure-receiving chamber is depressurized is developed using the enlarged-diameter portion, and the short-circuit is formed on the movable membrane. The fluid-filled vibration isolator according to any one of claims 1 to 3, further comprising a valve portion that switches the passage between a communication state and a cutoff state.   The alignment protrusion is formed at one place on the circumference of the movable film, and the alignment recess is formed at one place on the circumference of the accommodation space. The fluid-filled vibration isolator according to item 1.   6. An orifice passage that connects the main liquid chamber and the sub liquid chamber to each other is formed, and the orifice passage is located away from the enlarged diameter portion in the circumferential direction. The fluid-filled vibration isolator according to the item.

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