JP5215156B2 - Liquid-filled vibration isolator - Google Patents

Description

  The present invention relates to a liquid-filled vibration isolator.

  Conventionally, a first mounting tool, a cylindrical second mounting tool, a vibration-proof base made of a rubber-like elastic material that connects the first mounting tool and the second mounting tool, and a second mounting tool for preventing the vibration. A liquid-filled vibration isolator comprising: a diaphragm made of a rubber film that forms a liquid-sealed chamber with a vibration base; and a cap member that is attached to the second fixture and forms an air chamber with the diaphragm. It has been known.

  For example, Patent Literature 1 below discloses a vibration isolator shown in FIG. In this vibration isolator, the connecting and fixing of the lower end portion of the second fixture 201 and the open end portion of the cap member 202 is configured as follows. That is, a caulking tube portion 204 extending in the axial direction via the flange portion 203 is provided at the lower end portion of the second fixture 201, and the flange portion 205 at the open end portion of the cap member 202 is connected to the annular member at the outer peripheral portion of the diaphragm 206. Together with 207, the caulking tube portion 204 is folded inward so as to be wrapped from the outside by the caulking tube portion 204. As a result, the flange portion 205 of the cap member 202 and the annular member 207 are caulked and fixed between the bent edge portion of the caulking tube portion 204 and the flange portion 203.

Here, since the cap member 202 is made of metal such as aluminum, it can be firmly caulked and fastened together with the annular member 207 of the diaphragm 206 by the caulking tube portion 204 of the second mounting tool 201.
Japanese Patent No. 3909422

  However, when the cap member is to be formed of a synthetic resin due to a demand for weight reduction or the like, if the flange portion of the cap member is caulked and fixed with the caulking tube portion of the second fixture, the cap member is damaged. Resulting in. For this reason, it is required that the cap member is attached and fixed to the second metal fixture while the cap member does not receive a caulking load.

  The present invention has been made in view of the above points, and is a novel that enables a cap member made of resin to be attached to a second fixture together with an annular member of a diaphragm while preventing breakage thereof. An object of the present invention is to provide a liquid-filled vibration isolator having a caulking structure.

The liquid-filled vibration isolator according to the present invention includes a first mounting tool, a cylindrical second mounting tool, and a vibration-proof base made of a rubber-like elastic material that connects the first mounting tool and the second mounting tool. And a diaphragm made of a rubber-like elastic film that is attached to one axial end of the second fixture and forms a liquid sealing chamber between the vibration isolator base and the one axial end of the second fixture And a resin cap member that forms an air chamber between the diaphragm and the diaphragm, wherein the second fixture is disposed radially outward at one end in the axial direction. A caulking tube portion extending outward in the axial direction via a first flange portion projecting outward, and the cap member has a second flange portion projecting radially outward at the opening end portion. The diaphragm is fixed by caulking to the outer periphery by the caulking tube portion. A receiving recess for receiving the second flange portion is provided on the cap member side surface of the annular member, and a sealing member made of a rubber-like elastic material is provided in the receiving recess. The annular member is bent on the first flange portion, and the caulking tube portion is bent inward so as to wrap the annular member from the outside in a state where the second flange portion is received in the receiving recess. The annular member is caulked and fixed between the end edge portion of the caulking tube portion and the first flange portion, and the second flange portion is pressed against the seal member by the end edge portion. The second flange portion is sandwiched between the end edge portion and the annular member via the seal member.

  With such a configuration, only the annular member of the diaphragm receives the caulking load by the caulking cylinder portion of the second fixture. In the cap member, the second flange portion is not directly sandwiched between the bent edge portion of the caulking tube portion and the first flange portion, but the second flange portion is pressed against the seal member by the end edge portion. By being applied, it is sandwiched between the end edge portion and the annular member of the diaphragm via a seal member made of a rubber-like elastic material. Therefore, it is possible to prevent an excessive load from being applied to the second flange portion. Therefore, even if the cap member is made of resin, it can be fixedly attached to the second fixture while preventing the cap member from being damaged. In addition, since the sealing member is held between the second flange portion and the annular member, the air tightness of the air chamber on the inside can be improved.

In the liquid-filled vibration isolator according to the present invention, a sealing recess is provided on the inner peripheral side of the receiving recess of the annular member, and the sealing member is provided in the sealing recess. is, sealing projection to compress the sealing member protrudes axially into the second flange portion. Thus, by providing the convex part for a seal in the 2nd flange part and compressing the seal member provided in the concave part for a seal of an annular member by this convex part for a seal, the rigidity of the 2nd flange part is made. It is possible to enhance the sealing performance by compressing the sealing member.

  In the above configuration, the seal member is provided with a main seal portion that is compressed in the axial direction by the second flange portion, and a second flange portion that protrudes in the axial direction on the inner peripheral side of the main seal portion. And a convex sub-seal portion that abuts on the inner peripheral surface. In this case, when the second flange portion is pushed up by the end edge portion, the main seal portion is compressed, and high sealing performance is exhibited at that portion. Further, since the main seal portion is compressed, a force to spread outward acts on the convex sub seal portion provided on the inner periphery thereof, so that the sub seal portion is the second flange portion on the outside. By making contact with the inner peripheral surface, the sealing performance can be further enhanced. In particular, by applying in combination with the sealing concave portion and the sealing convex portion, it is possible to increase the force with which the convex sub-sealing portion tries to spread outward, thereby further improving the sealing performance.

  In this case, the outer peripheral surface of the convex sub-seal portion may be formed in a tapered surface shape that is inclined radially inward toward the tip side. Thereby, while improving the workability | operativity at the time of attaching a cap member with respect to a diaphragm, the sealing performance can be improved because the inner peripheral side of a 2nd flange part bites into the taper-shaped outer peripheral surface of a sub-seal part.

  In the above configuration, an outer peripheral side corner portion of the surface of the annular member on the cap member side may be formed in a curved surface shape. Thereby, the operation | work at the time of bending the crimping cylinder part of a 2nd fixture inside can be performed smoothly.

  In the liquid-filled vibration isolator, the partition that partitions the liquid-filled chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side, and the first liquid chamber and the second liquid chamber And an orifice for forming the orifice between the inner peripheral surface of the orifice forming member and an annular orifice forming member provided inside the peripheral wall portion of the second fixture. An elastic wall made of a rubber-like elastic material that closes, and a pair of partition plates that are connected to each other via a connecting portion that penetrates the radial central portion of the elastic wall and sandwiches the elastic wall in the axial direction of the elastic wall; It may be configured. The pair of partition plates includes a sandwiching portion that sandwiches the elastic wall on a radially outer side of the connecting portion, and the sandwiching portion is in a radial direction with the first sandwiching portion on the radially outer side. A high compression clamping portion may be provided that includes the second clamping portion on the inner side, and clamps the elastic wall at a higher compression rate in the axial direction than the second clamping portion.

  In general, the pair of partition plates connected to each other via a central connecting portion is separated from the elastic wall from the outer peripheral edge side with respect to the axial displacement. On the other hand, according to the said structure, the high compression clamping part with a high compression rate in an axial direction is provided in the radial direction outer side in the clamping part of the partition plate. As described above, since the high compression clamping portion is provided on the outer peripheral side as a starting point away from the elastic wall, the amount of displacement in the axial direction of the partition plate until the partition plate starts to separate from the elastic wall can be set large. The contact state of the partition plate with respect to can be maintained. Therefore, the abnormal noise resulting from the separation of the partition plate from the elastic wall can be reduced.

  Further, with the above configuration, the high compression clamping portion is provided on the radially outer side in the clamping portion of the partition plate, and the compression rate is not increased as a whole in the radial direction. Therefore, an increase in rigidity of the entire elastic wall can be suppressed, and the ease of reciprocation of the partition plate against high frequency vibration can be ensured, and the effect of reducing the dynamic spring constant can be maintained. Further, when the partition body is assembled, it is possible to avoid poor fixing at the connecting portion due to the reaction force of the elastic wall, and to maintain good assembly performance of the partition body.

  According to this invention, even if it is a resin-made cap member, it can attach to a 2nd fixture with the annular member of a diaphragm, preventing the damage, and can improve the airtightness of an air chamber.

  Hereinafter, a liquid-filled vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of a liquid-filled vibration isolator 10 according to the embodiment, and FIG. 2 is a longitudinal sectional view thereof. The vibration isolator 10 includes an upper first attachment 12 that is attached to an automobile engine, a lower cylindrical second attachment 14 that is attached to a vehicle body frame, and a rubber vibration isolation base that connects them. 16.

  The first fixture 12 is a boss fitting disposed above the shaft core portion of the second fixture 14, and is in the radial direction (that is, a direction perpendicular to the axis that is perpendicular to the axial direction X of the second fixture 14). A stopper flange 12A is provided so as to project outward from K. A mounting bolt 18 protrudes from the upper end and is configured to be attached to the engine-side bracket 1 via the bolt 18.

  The second fixture 14 includes a cylindrical aluminum body fitting 20 having a vibration-proof base 16 attached thereto, and an aluminum stopper fitting 22 that exerts a stopper action between the first fitting 12. It becomes.

  The main body fitting 20 has a main body overhanging portion 21 projecting radially outward Ko at its upper end, and a bent piece 21 </ b> A is erected upward on the outer edge of the main body overhanging portion 21. As shown in FIG. 1, the bent pieces 21 </ b> A are provided at two locations on the circumference facing each other in the radial direction K.

  The stopper bracket 22 is a member connected to the upper end portion of the main body bracket 20, and includes a cylindrical stopper regulating portion 23 that surrounds the first fixture 12 and regulates its displacement, and a peripheral portion from the lower end of the stopper regulating portion 23. It has a pair of stopper fixing portions 24 that are formed to project outward in the radial direction Ko at the upper two locations.

  The stopper restricting portion 23 surrounds the outer periphery of the stopper flange 12A of the first fixture 12 at a predetermined interval, and has a cylindrical first stopper portion 23A that restricts relative displacement in the horizontal direction of the first fixture 12; A second extending from the upper end of the first stopper portion 23A in an inward flange shape and positioned above the stopper flange 12A at a predetermined interval to limit the relative displacement of the first fixture 12 upward. And a stopper portion 23B.

  As shown in FIG. 1, the stopper fixing portion 24 is provided to face each other in the diameter direction orthogonal to the opposing direction of the pair of bent pieces 21 </ b> A of the main body metal 20. A pair of stopper fixing portions 24 are provided with mounting bolts 26 protruding downward, respectively, and are configured to be fastened and fixed to the upper surface of the vehicle body frame 2 by the mounting bolts 26.

  The main body metal fitting 20 and the stopper metal fitting 22 are coupled by caulking and fixing the flange portion 22A provided at the lower end opening end of the stopper metal fitting 22 so as to be wrapped from the outside by the bent piece 21A of the main body metal fitting 20. ing. As shown in FIG. 2, a tapered portion 27 that extends downward is provided between the stopper restricting portion 23 and the stopper fixing portion 24. The tapered portion 27 is formed by the bent piece 21A. The inclination angle in the circumferential direction portion that is not caulked and fixed is set smaller than the inclination angle in the caulking fixing portion. As a result, in the tapered portion 27A in which the inclination angle is set small, the main body metal 20 A drainage gap 28 is provided between the upper end of each of the two. Therefore, water that has entered the inside from the upper end of the stopper fitting 22 can be discharged to the outside through the gap 28.

  The anti-vibration base 16 is formed in a tapered cylindrical shape, and its upper end is vulcanized and bonded to the first fixture 12 and its lower end is bonded to the upper end opening of the main body 20. A rubber film-like seal wall 30 that covers the inner peripheral surface of the main body 20 is connected to the lower end of the vibration-isolating base 16.

  A flexible rubber that is disposed opposite to the lower surface of the vibration-isolating base 16 in the axial direction X at the lower end 20 </ b> A, which is one axial end of the main body 20, and forms a liquid sealing chamber 32 between the lower surface. A diaphragm 34 made of a film is attached, and a liquid is sealed in the liquid sealing chamber 32.

  A cap member 38 is attached to the lower end portion 20A of the main body metal member 20 so as to be opposed to the lower surface of the diaphragm 34 in the axial direction X and form a sealed air chamber 36 between the lower surface 20A. .

  The liquid sealing chamber 32 is partitioned by a partition 40 into a first liquid chamber 32A on the vibration isolating base 16 side and a second liquid chamber 32B on the diaphragm 34 side. The first liquid chamber 32A and the second liquid chamber are separated from each other. The 32B communicates with each other via an orifice 42 as a throttle channel. The first liquid chamber 32A is a main liquid chamber in which the vibration isolation base 16 forms part of the chamber wall, and the second liquid chamber 32B is a sub-liquid chamber in which the diaphragm 34 forms part of the chamber wall.

  As shown in FIGS. 2 and 3, the partition body 40 includes an annular orifice forming member 44 provided on the inner side of the peripheral wall portion of the main body 20, and an outer peripheral portion 46 </ b> A on an inner peripheral surface 44 </ b> A of the orifice forming member 44. It comprises an elastic wall 46 made of a rubber elastic body that is vulcanized and bonded to close the inner peripheral surface 44A, and a pair of upper and lower partition plates 48 and 50 that sandwich the elastic wall 46 in the axial direction X.

  The orifice forming member 44 is a member made of a rigid body that forms an orifice 42 extending in the circumferential direction between the peripheral wall portion of the main body fitting 20 and is fitted to the seal wall portion 30 on the inner periphery of the peripheral wall portion. . More specifically, the orifice forming member 44 is opened outward in a U-shaped cross section on the outer peripheral side of the cylindrical portion 44B and a cylindrical portion 44B that is coaxially disposed on the peripheral wall portion of the main body metal piece 20. And a recessed groove 44C. The inner peripheral surface of the cylindrical portion 44B is the inner peripheral surface 44A. Further, the orifice 42 is formed between the peripheral groove portion of the main body 20 by the concave groove portion 44C.

  The elastic wall 46 has a circular shape in plan view, and as shown in FIG. 4, the outer peripheral portion 46 </ b> A is vulcanized and bonded to the inner peripheral surface 44 </ b> A of the cylindrical portion 44 </ b> B of the orifice forming member 44. The elastic wall 46 includes a circular through hole 52 penetrating in the axial direction X at the radial center, and annular ridges 54 projecting in the axial direction X are provided on both front and back sides around the through hole 52. Yes.

  As shown in FIGS. 3 and 5, the pair of partition plates 48 and 50 are connected to each other via a cylindrical connecting portion 56 that passes through the through hole 52, and are integrally formed of a thermoplastic resin. One (upper) partition plate 48 of them constitutes a part of the chamber wall of the first liquid chamber 32A, that is, faces the first liquid chamber 32A (see FIG. 2). Further, the other (lower) partition plate 50 constitutes a part of the chamber wall of the second liquid chamber 32B, that is, is arranged facing the second liquid chamber 32B. The displacement amount in the axial direction X of the pair of partition plates 48 and 50 is regulated by the elastic wall 46.

  The pair of partition plates 48 and 50 are formed to have an outer shape smaller than that of the elastic wall 46 in plan view. That is, the outer peripheral edges 48A, 50A of the partition plates 48, 50 are terminated on the radially inner side Ki from the inner peripheral surface 44A of the orifice forming member 44 where the outer peripheral edge of the elastic wall 46 is located (see FIG. 3). ).

  Each of the pair of partition plates 48 and 50 is provided with an annular groove 58 around which the upper and lower ridges 54 of the elastic wall 46 are fitted around the central connecting portion 56. On the outer periphery of the annular groove 58, that is, on the radially outer side Ko, a sandwiching portion 60 that sandwiches the elastic wall 46 in the axial direction X is provided annularly over the entire circumference. Further, a gap is formed on the outer periphery of the sandwiching portion 60, that is, on the radially outward Ko side, to form a clearance S (see FIG. 7) that gradually increases toward the radially outward Ko side between the opposing wall surfaces of the elastic wall 46. A portion 62 is provided, and the gap forming portion 62 constitutes the outer peripheral edge of the partition plates 48 and 50.

  As shown in FIG. 7, the sandwiching portion 60 has a radially outer Ko side, that is, an outer peripheral side as a first sandwiching portion 64 with the radial center as a boundary, and a radially inner Ki side, that is, When the inner peripheral side is the second sandwiching portion 66, the first sandwiching portion 64 is provided with a high compression sandwiching portion 68 that sandwiches the elastic wall 46 at a higher compression rate in the axial direction X than the second sandwiching portion 66. Yes. That is, the sandwiching portion 60 includes a high compression sandwiching portion 68 in which the compression rate in the axial direction X of the elastic wall 46 is set to be the highest in the first sandwiching portion 64 on the outer peripheral side. Is set higher than the compression rate on the radially inner side Ki side and the compression rate on the radially outer side Ko side. Here, the compressibility in the axial direction X of the elastic wall 46 is a value obtained by dividing the amount of compression in the axial direction X of the elastic wall 46 by the pair of partition plates 48 and 50 by the original thickness of the elastic wall 46. Yes, the distance between the pair of partition plates 48 and 50 at the target part is U (see FIG. 5), and the original thickness of the elastic wall 46 at that part is T (see FIG. 4). ) / T. The compression rate in the high compression sandwiching portion 68 is such that the high compression sandwiching portion 68 does not separate from the wall surface of the elastic wall 46 even at the maximum expected displacement of the partition plates 48 and 50 in the axial direction X. It is set high so that compression remains.

  More specifically, in this example, as shown in FIG. 7, the compression ratio in the axial direction X of the elastic wall 46 is set to be substantially constant in the second sandwiching portion 66 on the inner peripheral side, and the first In the clamping portion 64, the compression rate gradually increases toward the radially outward Ko side, the compression rate becomes maximum at the high compression clamping portion 68, and from there, the compression rate gradually decreases toward the radially outward Ko side. The gap is formed so as to reach the gap forming portion 62 that forms the gap S.

  In order to set the compression rate as described above, the pair of partition plates 48 and 50 and the elastic wall 46 are formed in the following cross-sectional shapes. The partition plates 48 and 50 are formed in a plane perpendicular to the axial direction X so that the interval U is constant in the radial direction K from the second clamping part 66 to the high compression clamping part 68 of the first clamping part 64. In the outer peripheral side of the high compression sandwiching portion 68, it is formed in an inclined surface shape that is positioned gradually outward in the axial direction Xo toward the radially outward Ko side (see FIGS. 5 and 7). On the other hand, the elastic wall 46 has a wall surface 70 facing the second sandwiching portion 66 formed in a planar shape perpendicular to the axial direction X. From the outer peripheral side portion, that is, from the first sandwiching portion 64 and the first sandwiching portion 64. Also, the wall surface 72 facing the partition plate portion (that is, the gap forming portion 62) on the radially outer side Ko is formed in an inclined surface shape that is located on the axially outer side Xo toward the radially outer side Ko (see FIG. (See FIGS. 4 and 7). As a result, the outer peripheral portion 46A of the elastic wall 46 is formed thick. The inclined surface on the outer peripheral side of the partition plates 48 and 50 with respect to the high compression sandwiching portion 68 and the inclined surface of the wall surface 72 of the elastic wall 46 are both formed in a curved surface shape, and the former is inclined. Is set larger. Thereby, the said clearance gap S is gradually formed so that the radial direction outward Ko side.

  As shown in FIG. 7, the elastic wall 46 is provided with a concave portion 74 that is recessed in the axial direction X on the wall surface of the elastic wall portion sandwiched by the high compression sandwiching portion 68. In this example, the recess 74 is provided on the wall surface (lower wall surface) facing the second liquid chamber 32B, and a plurality (six in this case) are provided in the circumferential direction C as shown in FIG. It is juxtaposed at intervals. Thereby, the thin-walled low-rigidity portion 76 is intermittently provided in the circumferential direction C on the elastic wall portion sandwiched by the high compression clamping portion 68. In this example, the recess 74 is provided over substantially the entire portion facing the first sandwiching portion 64 in the radial direction K. Moreover, as shown in FIG. 6, the recessed part 74 is formed in circular arc shape, and between the recessed part 74, the inner peripheral side elastic wall part and the outer peripheral side elastic wall part are connected gently. The inclined surface-like high-rigidity portions 78 that are gradually thicker toward the radially outer side Ko are radially formed. The high rigidity portion 78 makes contact between the partition plate 50 and the elastic wall 46 at the high compression holding portion 68.

  As shown in FIG. 4, the connecting portion 56 includes a first plane portion 80 provided on one partition plate (in this example, a lower partition plate) 50 and perpendicular to the axial direction X, and a first plane portion 80. A fitting projection 82 projecting in the axial direction X, a fitting recess 84 provided on the other partition plate (in this example, the upper partition plate) 48 and fitted with the fitting projection 82, and a fitting recess 84 And a second flat surface portion 86 perpendicular to the axial direction X.

  The fitting convex portion 82 is a columnar convex portion provided coaxially with the axis of the partition plate 50, and protrudes upward from the first plane portion 80. The first planar portion 80 is a ring-shaped planar portion provided around the base portion of the fitting convex portion 82 over the entire circumference. The fitting recess 84 is a recess that opens downward so as to receive the fitting protrusion 82 from below. In this example, the fitting recess 84 also opens upward and is provided so as to penetrate in the axial direction X. An inner peripheral surface 84A of the fitting recess 84 is formed in a cylindrical surface shape. The second planar portion 86 is a ring-shaped planar portion provided at the lower opening end of the fitting recess 82 so as to face the first planar portion 80.

  As shown in FIGS. 4 and 5, the outer peripheral surface 82 </ b> A of the fitting convex portion 82 is provided with a first welded portion 88 spaced apart from the first flat surface portion 80 in the axial direction X. A second weld 90 is provided on the inner peripheral surface 84 </ b> A so as to be spaced apart from the second flat surface 86 in the axial direction X. The first welded portion 88 and the second welded portion 90 are portions that are welded and fixed by ultrasonic welding (see FIG. 7), and the first plane portion 80 and the second plane portion 86 are in contact with each other, so that the axial direction X In this state, the fitting convex portion 82 and the fitting concave portion 84 are configured to be fitted and fixed by welding the first welding portion 88 and the second welding portion 90.

  As shown in FIG. 5, the 1st welding part 88 and the 2nd welding part 90 are formed in the taper surface shape which mutually fits. That is, the first welded portion 88 is formed in a tapered surface shape having a gradually smaller diameter toward the distal end side at a position away from the first flat surface portion 80 on the outer peripheral surface 82A of the fitting convex portion 82. Further, the second welded portion 90 has a gradually smaller diameter and a taper of the first welded portion 88 on the inner peripheral surface 84 </ b> A of the fitting concave portion 84 at a position away from the second flat surface portion 86 toward the back side. It is formed in a tapered surface shape that is equivalent to the surface. The first welded portion 88 and the second welded portion 90 are welded in a state where the fitting convex portion 82 and the fitting concave portion 84 are coaxially positioned by the contact between these tapered surfaces.

  As shown in FIG. 7, in this example, the connecting portion 56 includes a first connecting portion 56A provided on the lower partition plate 50 and inserted from below into the through hole 52 of the elastic wall 46, and an upper partition. The second connecting portion 56B is provided on the plate 48 and is inserted into the through hole 52 from above. The first connecting portion 56A is provided with the first flat portion 80 and the fitting convex portion 82, and the first connecting portion 56A is formed in a stepped columnar shape having the first flat portion 80 as a stepped portion. Further, the second connecting portion 56B is provided with the second flat surface portion 86 and the fitting recess 84, and the second connecting portion 56B is a hollow circle having the same outer diameter as the large-diameter portion below the first connecting portion 56A. It is formed in a column shape. The fitting convex portion 82 and the fitting concave portion 84 are fitted and fixed so that the first flat portion 80 and the second flat portion 86 are in contact with each other at the central portion in the axial direction X of the through hole 52.

  In the present embodiment, in order to increase the rigidity of the base portion of the elastic wall 46 with respect to the orifice forming member 44 and to increase the displacement regulating effect of the pair of partition plates 48 and 50 at the time of low frequency and large amplitude, Configuration is adopted.

  That is, first, the outer peripheral portion 46A of the elastic wall 46 bonded and fixed to the inner peripheral surface 44A of the orifice forming member 44 has an inclined surface shape of the elastic wall 46 on the wall surface on the first liquid chamber 32A side. A raised portion 92 is provided to protrude from the wall surface 72 in the axially outward Xo side, that is, the first liquid chamber 32A side. The raised portion 92 has an annular shape extending over the entire circumferential direction C. Further, as shown in FIG. 7, the protruding portion 92 has a distal end (that is, an outer end in the axial direction X) 92 </ b> A on the first liquid chamber 32 </ b> A side than the first liquid chamber side end 44 </ b> D of the orifice forming member 44. Is located. Furthermore, the protruding portion 92 is formed so as to protrude beyond the upper surface of the partition plate 48 on the first liquid chamber 32A side toward the axially outward Xo side.

  Second, the inner peripheral surface 44A of the orifice forming member 44 to which the outer peripheral portion 46A of the elastic wall 46 is bonded and fixed protrudes radially inward Ki at the base portion of the elastic wall 46 on the second liquid chamber 32B side. A convex portion 94 is provided. As shown in FIG. 7, the convex portion 94 is formed in the shape of an inclined surface in which the side surface 94A on the axial direction X center side of the elastic wall 46 is positioned on the radially inner side Ki toward the lower side, and the second liquid chamber 32B. The side surface 94 </ b> B is formed in a planar shape perpendicular to the axial direction X of the elastic wall 46. The planar side surface 94B on the second liquid chamber side is a portion used as a pressing surface in the axial direction X of the mold when the elastic wall 46 is molded. Therefore, the base portion of the second liquid chamber 32B of the elastic wall 46 is formed in a state where the convex portion 94 is embedded so as to cover the top surface 94C excluding the side surface 94B and the side surface 94A on the center side.

  Reference numeral 96 is an air vent hole penetrating in the axial direction X provided in the partition plates 48 and 50, and a plurality of air vent holes are provided in the circumferential direction of the partition plates 48 and 50.

  As shown in FIG. 2, the partition body 40 having the above-described configuration is formed with an annular member 35 in which an orifice forming member 44 is embedded and integrated in the outer peripheral edge portion of the diaphragm 34, and a lower end outer peripheral portion of the vibration isolation base 16. By being sandwiched between the receiving step 16 </ b> A thus formed, the main body 20 is fixed.

  Next, the caulking structure at the lower end portion of the main body fitting 20 will be described.

  As shown in FIG. 8, the lower end portion 20 </ b> A of the main body 20 has a first flange portion 100 projecting radially outward Ko over the entire circumference, and an axially outward Xo from the outer peripheral edge of the first flange portion 100. A caulking cylinder portion 102 is provided so as to extend.

  The cap member 38 coupled to the lower end portion 20A of the main body metal 20 is a synthetic resin member having a relatively shallow bowl shape as shown in the figure. A second flange portion 104 that protrudes radially outward Ko over the entire circumference is provided at the open end 38A at the upper end of the cap member 38. Specifically, as shown in FIG. 10, the opening end portion 38A of the cap member 38 is gradually formed thicker as the outer peripheral surface is inclined outward toward the opening end side, and the tip end is radially outward. The second flange portion 104 is formed to project in the direction Ko. Further, a sealing convex portion 106 that protrudes in the axial direction X (that is, upward) is provided on the upper surface (that is, the surface on the diaphragm 34 side) 104A of the second flange portion 104. The sealing convex portion 106 is provided close to the inner peripheral edge of the upper surface 104 </ b> A of the second flange portion 104. The inner peripheral surface 104B of the second flange portion 104 including the sealing convex portion 106 is formed in a tapered surface shape that is slightly inclined radially outward Ko toward the upper side (that is, outward in the axial direction of the cap member 38). Has been.

  The annular member 35 provided on the outer peripheral portion of the diaphragm 34 is formed of a metal such as aluminum so as to be caulked and fixed by the caulking cylinder portion 102. Specifically, the annular member 35 has a ring plate shape, and the lower surface (that is, the surface on the cap member 38 side) 35A receives the second flange portion 104 as shown in FIGS. A recess 108 is formed to be recessed in the axial direction X. The receiving recess 108 is formed in a stepped shape on the inner peripheral side of the annular member 35 by securing the caulking portion 110 to be caulked by the caulking tube portion 102 at the outer peripheral edge portion thereof. A sealing recess 112 that is recessed in the axial direction X is provided on the inner peripheral side of the receiving recess 108. The sealing concave portion 112 is a recess that receives the sealing convex portion 106 of the second flange portion 104, and is formed in a stepped shape at the inner peripheral edge portion of the annular member 35.

  As shown in FIG. 10, the receiving recess 108 of the annular member 35 is provided with a seal member 114 made of a rubber elastic material. In this example, the sealing member 114 is provided so as to fill the sealing concave portion 112 of the receiving concave portion 108, and is thereby compressed by the sealing convex portion 106 of the second flange portion 104.

  More specifically, the seal member 114 includes a main seal portion 116 that is provided so as to fill the seal recess 112 and is compressed in the axial direction X by the seal protrusion 106, and an inner peripheral side of the main seal portion 116. In the axial direction X, that is, a convex sub-seal portion 118 that protrudes downward. The sub seal portion 118 is a convex portion that seals between the inner peripheral surface 104B by contacting the inner peripheral surface 104B of the second flange portion 104, and the outer peripheral surface 118A has a tip side (that is, a lower side). ) Is formed in a tapered surface shape slightly inclined toward the radially inward Ki side. As shown in FIG. 10, the tapered outer peripheral surface 118 </ b> A has a diameter D <b> 1 at the tip (i.e., lower end) of the tip of the inner peripheral surface 104 </ b> B that forms the taper surface of the second flange portion 104 (i.e., The diameter D0 at the upper end) is set slightly smaller than the diameter D0, and the diameter D2 at the base (that is, the upper end) is set slightly larger than the diameter D0.

  The seal member 112 is integrally vulcanized and formed on the annular member 35 by rubber continuous from the diaphragm 34. Further, a thin rubber film 120 connected to the diaphragm 34 is formed on the upper surface 35C of the annular member 35 (ie, the surface on the first flange portion 100 side).

  The surface on the cap member 38 side of the annular member 35, that is, the outer peripheral side corner portion 35B of the lower surface 35A is formed in a curved surface shape as shown in FIG. That is, in the annular member 35, the outer peripheral side corner portion 35B on the lower surface side is formed in a circular arc shape in the caulking portion 110 at the outer peripheral portion.

  The main body fitting 20, the diaphragm 34, and the cap member 38 having the above configuration are fixed by caulking as follows. That is, as shown in FIG. 11, the annular member 35 of the diaphragm 34 is fitted inside the caulking tube portion 102 of the main body bracket 20 and overlapped on the lower surface side of the first flange portion 100, and the second of the cap member 38. The flange portion 104 is received in the receiving recess 108 of the annular member 35. In this state, by bending the caulking tube portion 102 inward so as to wrap the annular member 35 from the outside, as shown in FIG. 9, the end edge portion 102A of the bent caulking tube portion 102 and the first flange portion 100 are formed. The annular member 35 is caulked and fixed between the two. At the same time, the second flange portion 104 is pressed against the seal member 114 by the end edge portion 102A, whereby the second flange portion 104 is sandwiched between the end edge portion 102A and the annular member 35 via the seal member 114. The As a result, the seal member 114 is held between the second flange portion 104 and the annular member 35 by pressure.

  More specifically, the caulking tube portion 102 is bent in a curved shape along the curved outer peripheral side corner portion 35 </ b> B of the annular member 35. The bent edge portion 102A of the caulking tube portion 102 wraps the caulking portion 110 and pushes up the second flange portion 104 so that the inner end 102B of the end edge portion 102A is connected to the second flange portion 104. It is set to cover the outer peripheral edge from the lower surface side.

  Further, the second flange portion 104 pushed up by the end edge portion 102A compresses the main seal portion 116 of the seal member 114 provided in the seal recess portion 112 by the seal projection portion 106. At this time, since the outer peripheral surface of the sub seal portion 118 is formed in a tapered shape as described above, the centering of the cap member 34 with respect to the diaphragm 34 can be facilitated, and workability can be improved. Further, the sealing performance can be enhanced by the sealing convex portion 106 of the second flange portion 104 biting into the tapered outer peripheral surface 118 </ b> A of the sub-sealing portion 118. Further, since the main seal portion 116 is compressed in the axial direction X, a force to spread outward acts on the convex sub seal portion 118 provided on the inner periphery thereof. By being pressed against the inner peripheral surface 104B of the second flange portion 104 on the outer side, the sealing performance can be further enhanced.

  In manufacturing the liquid-filled vibration isolator 10, the partition body 40 vulcanizes and molds the elastic wall 46 to the orifice forming member 44, and then the partition plate 48 from both the front and back sides of the elastic wall 46 as shown in FIG. , 50 and the connecting portion 56 is fixed by ultrasonic welding (see FIG. 3). Ultrasonic welding is a processing technique in which a thermoplastic resin is instantaneously melted and joined by fine ultrasonic vibration and pressure, and is, for example, 1 second or less using ultrasonic waves with a frequency of 20 kHz and an amplitude of 35 μm. It is possible to weld in a short time. In this example, with the elastic wall 46 in between, the fitting convex portion 82 of the lower partition plate 50 is fitted into the fitting concave portion 84 of the upper partition plate 48, and the first welding portion 88 and the second welding portion are fitted. From the state in which the 90 tapered surfaces are in contact with each other, ultrasonic waves are applied to the upper and lower partition plates 48 and 50 while pressing the upper and lower partition plates 48 and 50 in the clamping direction of the elastic wall 46. As a result, heat is generated and melted at the tapered surface portion that is a contact portion between the resins, so that the fitting convex portion 82 advances in the fitting concave portion 84 inward in the axial direction X. Since the first flat surface portion 80 and the second flat surface portion 86 stop when they come into contact with each other, the first flat surface portion 80 and the second flat surface portion 86 are in contact with each other by ending the pressurization and ultrasonic application at that time. Thus, the first welded portion 88 and the second welded portion 90 are welded and fixed.

  In the liquid, using the partition body 40 obtained in this way, and the vulcanized molded parts of the first fixture 12, the main body bracket 20, and the anti-vibration base 16 obtained separately by vulcanization molding. The partition body 40 is inserted into the body fitting 20. Further, after covering with the diaphragm 34, it is taken out from the liquid, covered with the cap member 38, and caulked and fixed to the lower end portion 20A of the main body fitting 20 as described above. Further, the stopper fitting 22 is caulked and fixed to the upper end portion of the body fitting 20 using the bent piece 21A as described above. As a result, it is possible to manufacture the liquid-sealed vibration isolator 10 in which the liquid enclosure chamber 32 in which the liquid is enclosed is provided on the upper side of the diaphragm 34 and the air chamber sealed on the lower side of the diaphragm 34 is formed. .

  In the liquid-filled vibration isolator 10 of the present embodiment configured as described above, only the annular member 35 of the diaphragm 34 receives the caulking load by the caulking cylinder portion 102 of the second fixture 14. The cap member 38 is sandwiched between the bent edge portion 102 </ b> A of the caulking tube portion 102 and the annular member 35 via a rubber seal member 114. Therefore, since it is possible to prevent an excessive load from being applied to the second flange portion 104 of the cap member 38, the cap member 38 can be mounted and fixed to the second fixture 14 without being damaged even though it is a resin cap member 38. Can do. Further, since the sealing member 114 is held between the second flange portion 104 and the annular member 35, the air tightness of the air chamber 36 on the inner side can be improved.

  In particular, the second flange portion 104 is provided with the seal convex portion 106, and the main seal portion 116 of the seal member 114 is compressed in the seal concave portion 106 provided in the annular member 35. The rigidity of the portion 104 can be increased, and the sealing performance by the compression of the seal member 114 can be further increased. Further, in combination with the tapered surface shape of the outer peripheral surface 118A of the sub seal portion 118, the sub seal portion 118 can also exhibit high sealing performance, and the air tightness of the air chamber 36 can be further improved.

  Further, since the outer peripheral side corner portion 35B of the annular member 35 is formed in a curved surface shape, it is possible to smoothly perform the work when the caulking tube portion 102 of the main body bracket 20 is bent inward.

  In the liquid-filled vibration isolator 10 according to the present embodiment, since the partition body 40 is provided, when a small amplitude vibration in a high frequency region occurs, the pair of partition plates 48 and 50 are integrated. By reciprocating, the fluid pressure in the first fluid chamber 32A can be absorbed and vibration can be reduced. Therefore, it is possible to effectively reduce the dynamic spring constant with respect to the high frequency fine amplitude vibration. On the other hand, when large-amplitude vibration in the low frequency region occurs, the displacement amount of the pair of partition plates 48 and 50 is regulated by the elastic wall 46, so that the first liquid chamber 32 </ b> A and the second liquid chamber 32 </ b> B pass through the orifice 42. The liquid can be circulated between them, and the vibration can be attenuated by the liquid flow effect. Therefore, both the damping performance in the low frequency region and the low dynamic spring in the high frequency region can be achieved.

  In the present embodiment, since the high compression clamping portion 68 having a high compressibility in the axial direction X is provided on the radially outer side Ko in the clamping portion 60 of the partition plates 48, 50, the partition plates 48, The amount of displacement in the axial direction X of the partition plates 48 and 50 until 50 begins to move away from the elastic wall 46 can be set large. For example, as shown in FIG. 12, when the partition plates 48 and 50 are excessively displaced upward, the upper partition plate 48 tends to move away from the elastic wall 46 from the outer peripheral edge side. By providing the high compression sandwiching portion 68, the high compression sandwiching portion 68 can maintain a contact state with the elastic wall 46. Particularly in this example, the compression ratio of this portion is set high so that the high compression clamping portion 68 does not move away from the wall surface of the elastic wall 46 even when the assumed maximum axial displacement occurs, as shown in FIG. Thus, it can prevent that the clamping part 60 leaves | separates from the elastic wall 46, and can prevent generation | occurrence | production of abnormal noise.

  Further, the high compression clamping portion 68 is provided on the radially outer side Ko side of the clamping portions 60 of the partition plates 48 and 50, and the compression rate is not increased in the entire radial direction K. The increase in rigidity can be suppressed, the ease of reciprocation of the partition plates 48 and 50 against high frequency vibrations can be ensured, and the effect of reducing the dynamic spring constant can be maintained. In addition, when the partition body 40 is assembled, it is possible to avoid poor welding at the connecting portion 56 due to the reaction force of the rubber of the elastic wall 46 compressed in the axial direction X, and the assembly of the partition body 40 is excellent.

  Further, since the thin low-rigidity portion 76 is intermittently provided in the circumferential direction C in the elastic wall 46 portion sandwiched by the high-compression sandwiching portion 68, the first outer radial Ko side where the high-compression sandwiching portion 68 is located is provided. It is possible to increase the compressibility in the axial direction X so that the partition plates 48 and 50 are not separated from the elastic wall 46 without making the elastic wall 46 portion sandwiched by the one sandwiching portion 64 hard, but rather keeping the portion soft. it can.

  Further, by providing a soft portion on the elastic wall 46 by the low-rigidity portion 76, the partition plates 48 and 50 can be easily reciprocated in the axial direction X with respect to minute amplitude vibration in a high frequency range, and a dynamic spring constant is obtained. Can be reduced. Furthermore, since the low-rigidity portion 76 is provided in the first clamping portion 64 on the outer peripheral side, the pair of partition plates 48 and 50 can be moved in a twisting direction in which the shaft core is inclined when a high-frequency vibration is input. While suppressing the displacement, it can be smoothly reciprocated in the axial direction X, and the effect of reducing the dynamic spring constant in the high frequency region can be further enhanced. The low-rigidity portion 76 is provided in the elastic wall 46 portion sandwiched between the pair of partition plates 48 and 50. Therefore, at the time of large amplitude vibration, a pair of elastic walls 46 is formed by the elastic wall 46 in the same manner as when the low-rigidity portion 76 is not provided. The reciprocating displacement of the partition plates 48 and 50 can be restricted.

  In the present embodiment, since the concave portion 74 is provided only on one wall surface (lower surface) of the elastic wall 46 in order to provide the low-rigidity portion 76, the sandwiching portion of the partition plate 48 is provided on the other wall surface (upper surface). 60 can be brought into contact with the entirety thereof, and abnormal noise can be made less likely to occur. The concave portion 74 can be provided only on the upper surface of the elastic wall 46, or can be provided on both upper and lower surfaces.

  In this embodiment, since the outer peripheral portion 46A of the elastic wall 46 is formed thick, it is possible to effectively regulate the reciprocating displacement of the partition plates 48 and 50 during large amplitude vibration in the low frequency range. it can. Further, since the raised portion 92 is provided on the outer peripheral portion 46A of the elastic wall 46, and the convex portion 94 is provided on the inner peripheral surface 44A of the orifice forming member 44 to which the outer peripheral portion 46A is bonded and fixed, the outer peripheral portion 46A of the elastic wall 46 is provided. The displacement restriction effect of the partition plates 48 and 50 at the time of large amplitude vibration can be further enhanced. Moreover, since the raised portion 92 provided on the first liquid chamber 32A side is made of rubber, even if the vibration-proof base 16 is excessively displaced downward and hits the raised portion 92, the vibration-proof base 16 is damaged. Can be prevented.

  In the present embodiment, the pair of partition plates 48 and 50 are welded at the fitting portion between the fitting convex portion 82 and the fitting concave portion 84 provided at the center thereof, and the welding portion The first welded portion 88 and the second welded portion 90 are tapered so as to be fitted to each other. For this reason, it is possible to effectively prevent the displacement of the coaxiality between the upper partition plate 48 and the lower partition plate 50 (the displacement in the radial direction). Further, since the positioning in the axial direction X is performed by bringing the first flat surface portion 80 and the second flat surface portion 86 into contact with each other without substantially welding, accurate positioning is possible. In combination with the fitting, the displacement of the parallelism can be effectively prevented. Furthermore, since the positioning part in the axial direction X and the welding part by the first welding part 88 and the second welding part 90 are provided at positions separated in the axial direction X, the resin residue due to welding advances to the positioning part. It is possible to prevent the position shift. Thus, since the positional deviation of the axial direction X, coaxiality, and parallelism at the time of connecting and fixing a pair of partition plates 48 and 50 can be suppressed, the dispersion | variation in vibration-proof performance can be suppressed.

  INDUSTRIAL APPLICABILITY The present invention can be used as various anti-vibration devices for automobiles, such as engine mounts for automobiles, in which vibration bodies and supports are coupled in an anti-vibration manner, and can also be used for various vehicles other than automobiles.

The top view of the liquid enclosure type vibration isolator which concerns on one Embodiment of this invention II-II sectional view of FIG. Longitudinal sectional view of the partition of the vibration isolator Exploded longitudinal sectional view of the partition Longitudinal sectional view showing the partition without the elastic wall Bottom view of the partition The principal part expanded sectional view of the partition Exploded longitudinal sectional view of the vibration isolator Longitudinal sectional view of the caulking fixing part of the second fixture of the vibration isolator Exploded longitudinal sectional view of the caulking fixing part Vertical section before caulking of the same caulking fixing part The principal part expanded sectional view at the time of the maximum displacement in the axial direction of the partition Longitudinal section of a conventional liquid-filled vibration isolator

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Liquid enclosure type vibration isolator, 12 ... 1st fixture, 14 ... 2nd fixture, 16 ... Anti-vibration base | substrate,
32 ... Liquid enclosure chamber, 32A ... First liquid chamber, 32B ... Second liquid chamber, 34 ... Diaphragm,
35 ... annular member, 35A ... lower surface (surface on the cap member side) of the annular member, 35B ... outer peripheral side corner 36 ... air chamber, 38 ... cap member, 38A ... open end, 40 ... partition body,
42 ... Orifice, 44 ... Orifice forming member, 46 ... Elastic wall,
48, 50 ... partition plate, 56 ... connecting part, 60 ... clamping part, 64 ... first clamping part,
66 ... second clamping part, 68 ... high compression clamping part,
DESCRIPTION OF SYMBOLS 100 ... 1st flange part, 102 ... Caulking cylinder part, 102A ... End edge part,
104 ... 2nd flange part, 104B ... Inner peripheral surface of 2nd flange part,
106: convex portion for sealing, 108: receiving concave portion, 112 ... concave portion for sealing,
114 ... Seal member, 116 ... Main seal part, 118 ... Sub seal part,
Ko ... radially outward, Ki ... radially inward, X ... axial direction, Xo ... axially outward

Claims (5)

A first fixture;
A cylindrical second fixture;
An anti-vibration base made of a rubber-like elastic material for connecting the first fixture and the second fixture;
A diaphragm made of a rubber-like elastic film that is attached to one end of the second fixture in the axial direction and forms a liquid sealing chamber with the vibration-proof base;
In a liquid-filled vibration isolator comprising a resin cap member that is attached to one end of the second fixture in the axial direction and forms an air chamber with the diaphragm,
The second fixture has a caulking tube portion extending outward in the axial direction through a first flange portion projecting radially outward at the one axial end portion,
The cap member has a second flange portion projecting radially outward at the opening end portion,
The diaphragm has an annular member made of a rigid body that is caulked and fixed to the outer peripheral portion by the caulking cylinder portion, and a receiving recess for receiving the second flange portion is provided on a surface of the annular member on the cap member side, A seal member made of a rubber-like elastic material is provided in the receiving recess;
The annular member is overlapped on the first flange portion, and the caulking tube portion is bent inward so as to wrap the annular member from the outside in a state where the second flange portion is received in the receiving recess. The annular member is caulked and fixed between the end edge portion of the caulking tube portion and the first flange portion, and the second flange portion is pressed against the seal member by the end edge portion and A second flange portion is sandwiched between the end edge portion and the annular member via the seal member ;
A seal recess that is recessed in the axial direction is provided on the inner peripheral side of the receiving recess of the annular member, the seal member is provided in the seal recess, and projects in the axial direction from the second flange portion. Protruding part for sealing to compress the member was provided,
A liquid-filled vibration isolator characterized by that. The seal member is provided with a main seal portion compressed in the axial direction by the second flange portion and an axially projecting side on the inner peripheral side of the main seal portion so as to contact the inner peripheral surface of the second flange portion. A convex sub-seal part in contact with,
The liquid-filled type vibration damping device according to claim 1 . The outer peripheral surface of the convex sub-seal portion is formed in a tapered surface shape that is inclined radially inward toward the tip side,
The liquid-filled vibration isolator according to claim 2 . The outer peripheral side corner portion of the surface of the annular member on the cap member side is formed in a curved surface shape,
The liquid-filled vibration isolator according to any one of claims 1 to 3 . A partition that divides the liquid sealing chamber into a first liquid chamber on the vibration-isolating substrate side and a second liquid chamber on the diaphragm side; and an orifice that communicates the first liquid chamber and the second liquid chamber;
The partition is
An annular orifice forming member that is provided inside the peripheral wall of the second fixture and forms the orifice;
An elastic wall made of a rubber-like elastic material that plugs between the inner peripheral surfaces of the orifice forming member;
A pair of partition plates that are connected to each other via a connecting portion that penetrates the radial center of the elastic wall, and sandwiches the elastic wall in the axial direction of the elastic wall;
The pair of partition plates include a sandwiching portion that sandwiches the elastic wall on a radially outer side of the connecting portion, and the sandwiching portion includes a first sandwiching portion on a radially outer side and a first sandwiching portion on a radially inner side. A high-compression sandwiching part that sandwiches the elastic wall at a higher compression rate in the axial direction than the second sandwiching part.
The liquid-filled vibration isolator according to any one of claims 1 to 4 .

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