JP5801134B2 - Liquid-filled vibration isolator - Google Patents

Description

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

  As an anti-vibration device such as an engine mount that supports the vibration of a vibration source such as an automobile engine so as not to be transmitted to the vehicle body side, a first attachment attached to the vibration source side, a second attachment attached to the support side, An anti-vibration base made of a rubber-like elastic body interposed between the fixtures, a main liquid chamber in which the anti-vibration base forms part of the chamber wall, and a sub-liquid chamber in which the diaphragm forms part of the chamber wall; And an orifice channel that communicates between the liquid chambers, and is configured to perform a vibration damping function and a vibration insulation function by the liquid flow effect by the orifice channel and the vibration damping effect of the vibration-proof substrate. An enclosed vibration isolator is known.

  In this type of liquid-filled vibration isolator, in order to reduce the dynamic spring constant against minute amplitude vibrations in the high frequency range, an elastic partition film is incorporated in the partition body that partitions the main liquid chamber and the sub liquid chamber. In some cases, the hydraulic pressure fluctuation between the liquid chambers is absorbed by the displacement (deformation) of the elastic partition membrane.

  For example, in Patent Document 1 below, a movable rubber plate is disposed on the partition body, and the central portion of the movable rubber plate is a highly rigid movable plate portion, and the outer peripheral portion is a rigid movable film portion, A structure having both characteristics is disclosed. However, in this structure, when the movable plate portion at the center portion contacts the upper and lower displacement regulating portions, the impact due to the collision may be transmitted as abnormal noise to the vehicle interior, that is, abnormal noise is generated. is there.

  Patent Document 2 below discloses that a thin-film buffer film material having viscoelasticity is attached to the displacement restricting portion in order to prevent abnormal noise caused by the collision between the movable plate and the displacement restricting portion. However, such a measure increases the cost significantly.

  In Patent Document 3 below, an elastic partition film is incorporated into the partition body, and the elastic partition film is provided with a displacement restricting protrusion at the position of the displacement restricting portion corresponding to the shape of the displacement restricting portion. It is disclosed that noise is reduced by bringing a protrusion and a displacement restricting portion into contact with each other to eliminate a gap between them. Further, it is disclosed that, when the amplitude is large, the rigidity of the elastic partition film is increased by the reaction force caused by the compression of the displacement restricting protrusion, thereby improving the damping performance. However, since the displacement restricting protrusion is simply formed in an annular shape and has a small protrusion height, the amount of deformation is small after contact with the displacement restricting portion at the time of large amplitude, so that the energy absorption amount is small. The energy transmitted to the main body cannot be relaxed sufficiently.

  The following Patent Document 4 discloses a configuration in which concave and convex portions by concave grooves and ridges are arranged concentrically on a movable plate incorporated in a partition body, and the thickness is changed. However, in the ridge having a substantially triangular cross section, the spring constant of the ridge itself is high, and when the amplitude is large, the amount of energy absorbed when the ridge collides with the displacement restricting portion is small. It cannot be relaxed enough.

JP 2003-0774617 A JP 2006-038017 A JP 2006-057727 A JP 2006-258217 A

  In view of the above-mentioned points, the present invention exhibits a high damping characteristic due to a liquid flow effect in an orifice channel at the time of large amplitude input while exhibiting a low dynamic spring characteristic at the time of inputting a small amplitude, and an elastic partition membrane. It is an object of the present invention to provide a liquid-filled vibration isolator capable of greatly reducing abnormal noise caused by a collision with a displacement restricting portion.

 The liquid-filled vibration isolator according to the present invention includes a first fixture that is attached to one of the vibration source side and the support side, a second fixture that is attached to the other of the vibration source side and the support side, and the first attachment. An anti-vibration base made of a rubber-like elastic body interposed between a fixture and the second fixture, a main liquid chamber in which a liquid forming a part of a chamber wall of the anti-vibration base is enclosed, and rubber-like A sub liquid chamber in which a liquid in which a diaphragm made of an elastic body forms a part of a chamber wall is sealed, a partition body that partitions the main liquid chamber and the sub liquid chamber, and the main liquid chamber and the sub liquid chamber And an orifice channel for communication. The partition includes an elastic partition film that partitions the main liquid chamber and the sub liquid chamber without flowing liquid, and a pair of sandwiching members that sandwich the peripheral edge of the elastic partition film from both sides. . The pair of clamping members include a pair of displacement restricting portions that restrict the amount of displacement of the flexible portion inside the peripheral edge of the elastic partition membrane from both sides of the elastic partition membrane. The flexible portion of the elastic partition membrane is provided with a thin cylindrical buffer portion that protrudes from the membrane surface toward the displacement restricting portion.

In the first aspect of the present invention, in the above configuration, the gap between the membrane surface of the elastic partition membrane main body excluding the buffer portion and the displacement restricting portion is set to be larger toward the inner side in the radial direction of the displacement restricting portion. A plurality of the buffer portions are provided concentrically with respect to the axis of the flexible portion, and the protrusion height from the film surface is increased as the inner buffer portion is formed .
According to a third aspect of the present invention, in the above-described configuration, a plurality of the buffer portions are provided concentrically with respect to the axis of the flexible portion, and the displacement restricting portion has a diameter between the plurality of the buffer portions. A protrusion for restricting the movement of each buffer portion in the radial direction is provided at the directional position.

  In the liquid-sealed vibration isolator according to the present invention, a thin-walled cylindrical buffer portion is provided in the flexible portion of the elastic partition membrane, thereby exhibiting a low dynamic spring characteristic at the time of inputting a small amplitude and a large amplitude. At the time of input, it is possible to increase the membrane rigidity and to exhibit high damping characteristics due to the liquid flow effect in the orifice flow path, and furthermore, because the energy absorption amount can be increased by the thin cylindrical buffer part, the elastic partition membrane and It is possible to greatly reduce abnormal noise due to collision with the displacement restricting portion.

It is a longitudinal cross-sectional view of the liquid filled type vibration isolator which concerns on 1st Embodiment. It is a top view of the partition body in the embodiment. It is the III-III sectional view taken on the line of FIG. (A) is the top view of the 1st clamping member in the embodiment, (b) is the IVb-IVb sectional view taken on the line, (c) is a bottom view. (A) is a top view of the elastic partition film in the same embodiment, (b) is a side view, (c) is a Vc-Vc line sectional view. It is a principal part expanded sectional view of the elastic partition film. It is a top view of the partition body in 2nd Embodiment. It is the VIII-VIII sectional view taken on the line of FIG. (A) is a top view of the 1st clamping member in 2nd Embodiment, (b) is the IXb-IXb sectional view taken on the line, (c) is a bottom view. (A) is a top view of the elastic partition film in 3rd Embodiment, (b) is a side view, (c) is a bottom view, (d) is Xd-Xd sectional view taken on the line. (A) is a top view of the elastic partition film in 4th Embodiment, (b) is a side view, (c) is a bottom view, (d) is a Xid-XId sectional view taken on the line. It is a principal part expanded sectional view of the partition body in 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
A liquid-filled vibration isolator 10 according to the present embodiment shown in FIG. 1 is an engine mount that supports an engine of an automobile, and an upper first fixture 12 that is attached to an engine side that is a vibration source, and a support. And a vibration-proof base 16 made of a rubber elastic body that is interposed between the two attachments 12 and 14 and connects them. It becomes. FIG. 1 shows a no-load state.

  The 1st fixture 12 is the boss | hub metal fitting distribute | arranged above the axial center part of the 2nd fixture 14, and the stopper part 18 which protrudes in a flange shape toward radial direction outward is formed. Moreover, the bolt hole 20 is provided in the upper end part, and it is comprised so that it may attach to an engine side via a volt | bolt not shown.

  The second fixture 14 is a main body metal fitting composed of a cylindrical body portion 22 in which the vibration-isolating base 16 is vulcanized and a bottomed cylindrical portion 24 connected to the lower end portion thereof. A downward-facing bolt 26 projects from the bottom surface of 24 and is configured to be attached to the vehicle body via the bolt 26. The lower end portion of the cylindrical body portion 22 is fixed by caulking to the upper end opening of the bottomed cylindrical portion 24 by a caulking portion 28. Reference numeral 30 is a stopper fitting fixed by caulking to the upper end portion of the cylindrical body portion 22, and exerts a stopper action with the stopper portion 18 of the first fixture 12.

  The anti-vibration base 16 is formed in a substantially umbrella shape, vulcanized and bonded in a state where the first fixture 12 is embedded in the upper portion thereof, and a lower end outer peripheral portion is vulcanized and bonded to an upper end opening of the cylindrical body portion 22. ing. A rubber film-like seal wall portion 32 that covers the inner peripheral surface of the cylindrical body portion 22 is connected to the lower end portion of the vibration isolation base 16.

  A diaphragm 36 made of a flexible rubber film is disposed on the second fixture 14 so as to be opposed to the lower surface of the vibration isolating base 16 in the axial direction X and form a liquid sealing chamber 34 with the vibration isolating base 16. A liquid is enclosed in the liquid enclosure chamber 34. The diaphragm 36 includes an annular reinforcing bracket 36A on the outer peripheral portion, and is fixed to the caulking portion 28 via the reinforcing bracket 36A.

  The liquid sealing chamber 34 is formed between the lower surface of the vibration-isolating base 16 and the diaphragm 36 inside the second fixture 14 (specifically, the cylindrical body portion 22). On the vibration base 16 side, that is, the upper main liquid chamber 34A where the vibration isolation base 16 forms a part of the chamber wall, and on the diaphragm 36 side, ie, the lower sub liquid chamber 34B where the diaphragm 36 forms a part of the chamber wall. It is partitioned. The main liquid chamber 34 </ b> A and the sub liquid chamber 34 </ b> B are communicated with each other by a single orifice channel 40.

  The partition body 38 is fitted to the inside of the cylindrical body portion 22 via the seal wall portion 32, and is held using a partition receiving plate 42 disposed in contact with the lower surface side thereof. The partition receiving plate 42 is an annular metal fitting having an opening at the center, and the partition 38 is provided on the seal wall 32 by fixing the peripheral edge together with the reinforcing metal fitting 36A of the diaphragm 36 by the caulking portion 28. The stepped portion 32A and the partition receiving plate 42 are held in a state of being sandwiched in the axial direction X.

  The partition 38 includes an elastic partition film 44 made of a rubber elastic body that partitions the main liquid chamber 34A and the sub liquid chamber 34B, a first clamping member 46 that houses the elastic partition film 44 on the inner peripheral surface side, and a first A second clamping member 48 that clamps the peripheral edge of the elastic partition film 44 with the clamping member 46 is provided (see FIGS. 2 and 3).

  The elastic partition film 44 is a disk-shaped rubber film as shown in FIG. The elastic partition film 44 is formed as an outer peripheral thick portion 50 having a thick peripheral edge, and is formed as a flexible portion 52 having a thin disc shape inside the outer peripheral thick portion 50. .

  The outer peripheral thick part 50 is a part that is clamped and held from both sides by the first and second clamping members 46 and 48, and the first and second clamping members 46 and 48 come into close contact with each other, so that the outer peripheral thick part 50 50 is kept liquid-tight. The outer peripheral thick portion 50 may be held in a state compressed in the axial direction X by the first and second holding members 46 and 48, thereby reliably preventing liquid leakage.

  The flexible portion 52 has one surface facing the main liquid chamber 34A so that the pressure of the main liquid chamber 34A is exerted on one surface thereof, and the other surface so that the pressure of the sub liquid chamber 34B is exerted on the other surface. The direction faces the secondary liquid chamber 34B. Thereby, the flexible part 52 is configured to be able to bend and deform (displace) in the axial direction X by the fluid pressure fluctuation of the main liquid chamber 34A and the sub liquid chamber 34B. In addition, the flexible part 52 is not provided with a through-hole, and therefore the flexible part 52 partitions the main liquid chamber 34A and the sub liquid chamber 34B without flowing liquid.

  The first clamping member 46 is an annular member made of a rigid material such as aluminum or resin. As shown in FIG. 3, the outer circumferential surface is provided with an orifice-forming groove 54 that opens outward, and the seal wall portion 32 is formed. The orifice channel 40 extending along the circumferential direction is formed between the inner circumferential surface of the cylindrical body portion 22 and the inner circumferential surface (see FIG. 1). Therefore, the first clamping member 46 includes an orifice forming portion that forms the orifice channel 40 on the outer peripheral portion. As shown in FIG. 2, the first clamping member 46 includes a notch-shaped main liquid chamber side opening 40 </ b> A that opens to the main liquid chamber 34 </ b> A at one end in the circumferential direction C of the orifice forming groove 54. The other end of C is provided with an auxiliary liquid chamber side opening (not shown) that opens to the auxiliary liquid chamber 34B, and the orifice channel 40 communicates between the main liquid chamber 34A and the auxiliary liquid chamber 34B through these openings. ing. In this example, the orifice channel 40 is tuned to a low frequency range (for example, about 5 to 15 Hz) corresponding to the shake vibration in order to attenuate the shake vibration during vehicle travel. That is, tuning is performed by adjusting the cross-sectional area and the length of the flow path so that the damping effect based on the resonance action of the liquid flowing through the orifice flow path 40 is effectively exhibited when the shake vibration is input. However, it is not limited to this.

  The first clamping member 46 has a circular ring-shaped first outer circumference clamping portion 56 that supports the outer circumferential thick portion 50 on the side of the auxiliary liquid chamber 34 </ b> B with respect to the elastic partition film 44, and the flexible inside the first outer circumference clamping portion 56. And a first displacement restricting portion 58 that restricts the amount of displacement of the portion 52 in the axial direction X.

  The second clamping member 48 is a disk-like member that is fitted and fixed in a circular recess in plan view provided on the upper surface side of the first clamping member 46, and is formed of a rigid material such as aluminum or resin. Yes. The second clamping member 48 is located on the main liquid chamber 34 </ b> A side with respect to the elastic partition film 44, and clamps the outer peripheral thick part 50 of the elastic partition film 44 together with the first clamping member 46. Therefore, the second clamping member 48 includes a circular ring-shaped second outer circumferential clamping portion 60 that sandwiches the outer circumferential thick portion 50 together with the first outer circumferential clamping portion 56. In addition, a second displacement restricting portion 62 for restricting the amount of displacement of the flexible portion 52 in the axial direction X is provided inside the second outer periphery clamping portion 60. Accordingly, the first displacement restricting portion 58 and the second displacement restricting portion 62 are configured to restrict the amount of displacement of the flexible portion 52 in the axial direction X from both sides of the elastic partition film 44.

  As shown in FIG. 4, a plurality of openings 64 are formed through the second displacement restricting portion 62 in order to transmit the fluid pressure fluctuation in the main fluid chamber 34 </ b> A to the elastic partition film 44. In this example, the openings 64 are provided at the center of the circular second displacement restricting portion 62 and are provided at equal intervals at a plurality of locations on the circumference (four locations in the figure). Similarly, a plurality of openings 66 are formed through the first displacement restricting portion 58 in order to transmit the hydraulic pressure fluctuation in the sub liquid chamber 34B to the elastic partition film 44. In this example, the opening 66 is formed so that the opening 64 of the second displacement restricting portion 62 overlaps the opening 64 of the second displacement restricting portion 62 when viewed from the axial direction X, the center of the first displacement restricting portion 58 having a circular shape, the circumference on the outer periphery, and the like. It is provided at a plurality of locations at intervals. Note that reference numeral 67 in FIG. 4 denotes a locking protrusion provided along the inner peripheral edge of the second outer periphery clamping portion 60, and the outer peripheral thick portion 50 is locked to limit the inward displacement thereof. To do. Similar locking protrusions 67 are also provided in the first outer periphery clamping portion 56 as shown in FIG.

  As shown in FIG. 3, the upper surface of the first displacement restricting portion 58 (ie, the surface facing the flexible portion 52) is inclined (tapered) inclined toward the sub liquid chamber 34B from the outer peripheral side toward the center. It is formed in a planar shape. Further, the lower surface of the second displacement restricting portion 62 (that is, the surface facing the flexible portion 52) is formed in an inclined surface shape (tapered surface shape) inclined toward the main liquid chamber 34A from the outer peripheral side toward the center. Has been. Thus, the gap between the pair of displacement restricting portions 58 and 62 is formed so as to gradually increase toward the inner side in the radial direction K. As described above, since the flexible portion 52 of the elastic partition film 44 is a thin disk, the film surface of the elastic partition membrane body (that is, the flexible portion 52) excluding the buffer portion 68 described later and the displacement regulating portion 58. , 62 is set to gradually increase toward the inner side in the radial direction K of the displacement restricting portions 58, 62.

  The flexible part 52 of the elastic partition film 44 has a thin cylindrical buffer part 68 protruding from the film surface toward the first and second displacement restricting parts 58 and 62, and the axis (center) of the flexible part 52. It is provided concentrically with O (see FIG. 5). The buffer portions 68 are provided so as to protrude from the film surfaces on both the front and back sides of the flexible portion 52, and are formed symmetrically on both the front and back sides. The shock absorber 68 increases the rigidity of the elastic partition film 44 by contact with the displacement restricting portions 58 and 62 when a large amplitude is input, and also reduces a shock caused by the contact with the displacement restricting portions 58 and 62. It is. The buffer unit 68 lowers the rigidity of the flexible unit 52 when low amplitude is input and exhibits low dynamic spring characteristics, and also when the large amplitude is input, the buffer unit 68 is deformed even after contact with the displacement regulating units 58 and 62. In order to allow and reduce the transmission energy to the partition body 38, it is formed in a thin cylindrical shape. That is, as shown in FIG. 6, the buffer portion 68 is thin so that the projection height Q from the film surface is at least twice the thickness (average thickness in the axial direction X) P (Q ≧ 2P). In addition, the buffer portion 68 can be easily deformed in the axial direction X even after contact with the displacement restricting portions 58 and 62 when a large amplitude is input. More preferably, the protrusion height Q is at least three times the thickness P (Q ≧ 3P). Moreover, it is preferable that the inclination angle (angle with respect to the axial direction X) θ of both side surfaces of the buffer portion 68 is 0 ° ≦ θ ≦ 30 °.

  As shown in FIG. 5, a plurality of buffer portions 68 are provided concentrically with respect to the axis O of the flexible portion 52. In this example, the inner buffer portions are spaced apart from each other in the radial direction K. 68A, the intermediate buffer part 68B, and the outer buffer part 68C are provided in triple. It is preferable that at least one buffer portion 68 is provided in the range of 50% of the diameter of the flexible portion 52 around the axis O. That is, at least one buffering portion 68 is arranged within a range of D / 2 with the axis O as the center when the diameter of the flexible portion 52 is D (see FIG. 3). As an example, in the illustrated example, the diameter D of the flexible portion 52 is 40 mm, the inner buffer portion 68A has a diameter of 10 mm, the intermediate buffer portion 68B has a diameter of 20 mm, and the outer buffer portion 68C has a diameter of 30 mm. The two buffer parts, the inner buffer part 68A and the intermediate buffer part 68B, are arranged within the range of D / 2.

  As shown in FIG. 6, the three buffer portions 68A, 68B, and 68C are arranged such that the inner buffer portion is closer to the inner buffer portion according to the size of the gap G between the film surface of the flexible film 52 and the displacement restricting portions 58 and 62. The protrusion height Q from the surface is set large. As an example, in the illustrated example, the inner buffer portion 68A has a protrusion height Q = 4 mm, a wall thickness P = 1 mm, and an inclination angle θ = 5 °, and the intermediate buffer portion 68B has a protrusion height Q = 3 mm, a wall thickness. The thickness P = 0.9 mm and the inclination angle θ = 5 °, and the outer buffer portion 68C has a protruding height Q = 2 mm, a wall thickness P = 0.7 mm, and an inclination angle θ = 5 °. In this example, the height of each buffer portion 68 is set so as to abut against the opposed displacement restricting portions 58 and 62 without clearance (clearance: 0 mm). A clearance may be set between the portions 58 and 62, or the buffer portion 68 may be provided in a state of being precompressed with respect to the displacement restricting portions 58 and 62.

  In FIG. 4, reference numeral 70 denotes a liquid escape hole provided in the displacement restricting portions 58 and 62, and is provided through the displacement restricting portions 58 and 62 in the axial direction X. When the plurality of buffer portions 68 are provided concentrically as described above, the liquid chamber between the flexible portion 52 and the displacement restricting portions 58 and 62 is partitioned in the radial direction K by the buffer portion 68 (see FIG. 3). The flexible part 52 is difficult to bend and deform. Therefore, when the flexible portion 52 is bent and deformed, a liquid escape hole 70 is provided so as to allow the liquid to escape from the liquid chamber portion between the buffer portions 68 to the main liquid chamber 34A and the sub liquid chamber 34B, respectively. It is easy to do. In this example, the liquid escape holes 70 are provided at four positions on the circumference at positions corresponding to the spaces between the buffer portions 68.

  In the liquid-filled vibration isolator 10 having the above-described configuration, the elastic partition film 44 is provided with a buffer portion 68 for restricting the displacement of the flexible portion 52. However, the buffer portion 68 has a thin cylindrical shape. Therefore, the film rigidity is small. Therefore, the elastic partition film 44 effectively reduces the hydraulic pressure difference between the main liquid chamber 34A and the sub liquid chamber 34B when a small amplitude is input, that is, when vibration on the high frequency side is input with a relatively small amplitude, such as when the vehicle is idle. The dynamic spring constant can be reduced by relaxing.

  On the other hand, when a large amplitude is input, for example, when a vibration on the low frequency side with a relatively large amplitude such as a shake vibration during driving of the vehicle is input, the buffer portion 68 that is bent and deformed contacts the upper and lower displacement regulating portions 58 and 62. Since the membrane rigidity can be increased by being compressed, a high attenuation characteristic due to the liquid flow effect in the orifice channel 40 can be realized. At this time, in the present embodiment, since the buffer portion 68 has a thin cylindrical shape, the buffer portion 68 can be elastically deformed in the axial direction X even after contact with the displacement restricting portions 58 and 62. . Therefore, the energy transmitted to the partition 38 (that is, the first and second holding members 46 and 48) can be reduced. That is, in this case, the transmission energy E to the partition 38 is expressed by E = E1-E2 where E1 is the kinetic energy of the buffer 68 and E2 is the energy consumed by the deformation of the buffer 68. The energy transmitted to the partition 38 can be reduced by the amount of energy consumed by the deformation of 68, and the generation of abnormal noise can be suppressed.

  Moreover, since the buffer part 68 is a thin cylinder shape, the load change by the collision with the displacement control parts 58 and 62 becomes smooth, and the shock feeling by a collision can be reduced. For these reasons, it is possible to significantly reduce the noise caused by the collision between the elastic partition film 44 and the displacement restricting portions 58 and 62.

  According to the present embodiment, since a plurality of the buffer portions 68 are provided concentrically, energy consumption due to deformation of the buffer portion 68 is increased, and energy transmitted to the partition body 38 can be further reduced. Further, by restricting displacement at a plurality of locations in the radial direction K, it is possible to restrict displacement of the flexible portion 52 as a whole, thereby reducing volume loss due to swelling of the portion where displacement is not restricted, and higher attenuation characteristics. Can be realized.

  Further, the gap G between the membrane surface of the elastic partition membrane 44 main body and the displacement regulating portions 58 and 62 is set larger toward the inner side in the radial direction K, and the buffer portion (inner buffer portion) 68A is also provided on the inner side. And the inner buffer portion 68 is set so that the protruding height Q from the film surface is larger, so that the following operational effects can be obtained. That is, in order to increase the energy consumption, it is effective to increase the protrusion height Q of the buffer portion 68 and ensure a large displacement stroke in the axial direction X of the buffer portion 68. At that time, in the elastic partition film 44 to which the peripheral edge is fixed, the deflection deformation in the axial direction X is larger toward the center, so that the closer to the center, the larger the displacement stroke for energy absorption can be secured. On the other hand, if the gap G is set to be large in the entire radial direction K, the space volume that allows deformation above and below the flexible portion 52 increases, which may increase volume loss that adversely affects the high attenuation characteristics. . On the other hand, the gap G is set to be larger toward the inner side in the radial direction K, that is, smaller on the outer side, thereby suppressing an increase in the deformation allowable volume of the flexible portion 52 and reducing the energy. The displacement stroke can be increased. For this reason, it is possible to achieve a higher degree of compatibility between the noise reduction effect due to energy absorption and the high attenuation characteristics due to volume loss reduction.

[Second Embodiment]
7 to 9 are drawings according to the second embodiment. In this example, the pair of clamping members 46 and 48 is different from the first embodiment in that the protrusions 72 are provided on the displacement restricting portions 58 and 62. .

  That is, in the second embodiment, radial positions between a plurality of concentric buffer portions 68 formed concentrically on each surface of the first displacement restricting portion 58 and the second displacement restricting portion 62 facing the flexible portion 52. Each is provided with a protrusion 72. The protrusion 72 has a streak shape extending in the circumferential direction between the inner and outer buffer portions 68, and is formed concentrically as shown in FIG. 9C. In this example, the protrusions 72 are formed not only between the buffer portions 68 but also on the inner peripheral side of the inner buffer portion 68A and on the outer peripheral side of the outer buffer portion 68C. By providing such a protrusion 72, when the flexible portion 52 is bent and deformed, the buffer portion 68 that contacts and deforms the displacement restricting portions 58 and 62 shifts in the radial direction K on the surface of the displacement restricting portions 58 and 62. It is possible to prevent so-called side slip. When the buffer portion 68 slides sideways, not only energy consumption due to deformation of the buffer portion 68 in the axial direction X decreases, but also the displacement of the flexible portion 52 increases and volume loss increases. By preventing this, it is possible to effectively secure energy consumption due to deformation of the buffer portion 68 and to suppress volume loss.

  When the projection 72 is provided in this way, the liquid escape hole 70 can be provided at the position where the projection 72 is provided, as shown in FIG. 9C.

  Since other configurations and operational effects are the same as those of the first embodiment, description thereof will be omitted. In this embodiment, the protrusion 72 is provided. However, since the protrusion 72 itself does not restrict the displacement amount of the flexible portion 52, the displacement restricting portions 58 and 62 that restrict the displacement amount are elastically elastic. The gap G with the membrane surface of the partition membrane main body is set to be larger toward the inner side in the radial direction K. Therefore, the same effects as those of the first embodiment are exhibited.

[Third Embodiment]
FIG. 10 is a drawing according to the third embodiment. In this example, the point that the reinforcing rib 74 is provided on the elastic partition film 44 is different from the first embodiment.

  That is, in the third embodiment, the reinforcing rib 74 for reinforcing the buffer portion 68 is provided in the film portion inside the buffer portion 68 in the elastic partition film 44. The reinforcing rib 74 has a shape in which a plurality (four in this example) are radially extended from the axis O of the flexible portion 52 and connected to the inner peripheral surface of the inner buffer portion 68A, as shown in FIG. As shown, the upper surface is inclined so as to gradually increase from the center toward the outer side in the radial direction K, thereby reinforcing the base portion of the inner buffer portion 68A. A plurality of lines (in this example) are also provided between the inner buffer portion 68A and the intermediate buffer portion 68B and between the intermediate buffer portion 68B and the outer buffer portion 68C in the same manner and in phase with the inner buffer portion 68A. Four) reinforcing ribs 74 are formed extending radially. Therefore, in this example, as shown in FIG. 10A, the reinforcing rib 74 is formed in a cross shape in plan view. The reinforcing ribs 74 are provided with respect to the buffer portions 68 on both sides of the front and back sides, and are arranged 45 degrees out of phase on the front and back sides.

  According to this embodiment, by providing the reinforcing ribs 74 extending in the radial direction K between the buffer portions 68, the settling due to repeated deformation of the buffer portions 68 can be greatly improved. Further, if the rib 74 reinforces the base portion of the buffer portion 68, the change in rigidity of the buffer portion 68 as a whole is small, so that the influence on the noise performance can be suppressed. Since other configurations and operational effects are the same as those of the first embodiment, description thereof will be omitted.

[Fourth Embodiment]
FIG. 11 is a drawing according to the fourth embodiment. In this example, the arrangement configuration of the reinforcing ribs 74 is different from that of the third embodiment.

  That is, the fourth embodiment is different from the third embodiment in that the reinforcing ribs 74 are arranged with the phase shifted in the circumferential direction C inside and outside each buffer portion 68. Specifically, the reinforcing ribs 74 on the inner side of the inner buffer part 68A and the reinforcing ribs 74 between the inner buffer part 68A and the intermediate buffer part 68B are arranged 45 degrees out of phase, and the inner buffer part 68A. The reinforcing rib 74 between the intermediate buffering portion 68B and the reinforcing rib 74 between the intermediate buffering portion 68B and the outer buffering portion 68C are arranged 45 degrees out of phase. The reinforcing ribs 74 are provided with respect to the buffer portions 68 on both sides of the front and back sides, and are arranged 45 degrees out of phase on the front and back sides.

  In the aspect of the third embodiment, the settling can be greatly improved as compared with the case where the reinforcing rib 74 is not provided, but the deformation is large and set easily in the direction in which the reinforcing rib 74 is not set. On the other hand, as in the fourth embodiment, by arranging the reinforcing ribs 74 with the phases shifted in the circumferential direction C inside and outside each buffer portion 68, the directionality of the reinforcing effect by the reinforcing ribs 74 can be reduced. It can be made difficult to be deformed with respect to input from multiple directions, and can be made more difficult to stick. Since other configurations and operational effects are the same as those of the third embodiment, description thereof will be omitted.

[Fifth embodiment (reference example) ]
FIG. 12 is a drawing according to the fifth embodiment. In this example, the configuration for setting the gap G between the membrane surface of the elastic partition membrane 44 main body and the displacement regulating portions 58 and 62 larger toward the inner side in the radial direction K is different from that in the first embodiment.

  That is, in this example, the flexible portion 52 of the elastic partition film 44 is formed in a tapered surface instead of forming the displacement regulating portions 58 and 62 in a tapered surface. Specifically, the opposing surfaces of the displacement regulating portions 58 and 62 are formed in a planar shape perpendicular to the axial direction X. On the other hand, the flexible portion 52 is provided with a thick portion 76 having a substantially triangular cross section that is formed thicker toward the outer side in the radial direction K. By the thick portion 76, the lower surface of the flexible portion 52 is provided. (That is, the surface facing the first displacement restricting portion 58) is formed in an inclined surface shape inclined toward the first displacement restricting portion 58 toward the outer side in the radial direction K, and the upper surface of the flexible portion 52 (ie, the second surface). The surface facing the displacement restricting portion 62 is formed in an inclined surface shape that is inclined toward the second displacement restricting portion 62 toward the outer side in the radial direction K. Thereby, the gap G between the membrane surface of the elastic partition membrane main body (that is, the flexible portion 52) excluding the buffer portion 68 and the displacement restricting portions 58 and 62 is inward in the radial direction K of the displacement restricting portions 58 and 62. It is set to gradually increase toward the side. In other words, the inner circumferential gap Gi is set larger than the outer circumferential gap Go (Go <Gi).

  Further, in this example, one buffer portion 68 is provided on each of the front and back surfaces, and the buffer portion 68 is within the range of 50% of the diameter of the flexible portion 52 around the axis O of the flexible portion 52. Is provided. That is, one buffer portion 68 is provided on the inner peripheral side where the gap G is set to be large as Gi. The shape of the buffer portion 68 itself is the same as that in the first embodiment.

  Even when the dimension of the gap G is set by the shape of the flexible portion 52 of the elastic partition film 44 instead of the shape of the displacement restricting portions 58 and 62 as in the present embodiment, the deformation of the flexible portion 52 is allowed to be deformed. While suppressing the increase in volume, the displacement stroke for absorbing energy in the buffer portion 68 can be increased, and both the noise reduction effect due to energy absorption and the high attenuation characteristic due to volume loss reduction can be achieved. . However, in the case of the shape of the flexible portion 52, since the rigidity is increased by increasing the thickness of the flexible portion 52, the first embodiment is more advantageous in terms of low dynamic spring characteristics. Further, in the fifth embodiment, since the number of buffer portions 68 is one, the first embodiment is more advantageous in terms of the effect of reducing abnormal noise. Since other configurations and operational effects are the same as those of the first embodiment, description thereof will be omitted.

[Other Embodiments]
Although the case where the buffer part 68 was made into the perfect cylinder shape over the perimeter was demonstrated in the said embodiment, you may provide the slit which extends in the buffer part 68 in the height direction (axial direction X). The slit can be provided at one or more locations in the circumferential direction of the buffer portion 68. By providing such a slit, the film rigidity can be controlled.

  In the above-described embodiment, the single-orifice structure vibration isolator having a single orifice passage has been described. However, if the liquid-filled vibration isolator is used to connect a plurality of liquid chambers through the orifice passage, a double orifice is used. The present invention can be applied to various liquid-filled vibration isolators such as a structure vibration isolator. Further, the liquid-filled vibration isolator 10 may be one that is turned upside down and assembled to a vehicle. Further, in addition to the engine mount, the liquid-filled vibration isolator 10 is applicable to various vibration isolators such as a body mount and a differential mount. Is possible. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Liquid enclosure type vibration isolator 12 ... 1st fixture 14 ... 2nd fixture 16 ... Anti-vibration base | substrate 34A ... Main liquid chamber 34B ... Sub liquid chamber 36 ... Diaphragm 38 ... Partition body 40 ... Orifice flow path 44 ... Elasticity Partition film 46 ... first clamping member 48 ... second clamping member 52 ... flexible portion 58 ... first displacement regulating portion 62 ... second displacement regulating portions 68, 68A, 68B, 68C ... buffering portion 72 ... projection 74 ... reinforcing rib X: Axial direction C: Circumferential direction K: Radial direction G: Gap between the membrane surface of the elastic partition membrane main body and the displacement regulating portion O: Axial center of the flexible portion P: Thickness of the buffer portion Q: Projection height of the buffer portion The

Claims (6)

A first fixture attached to one of the vibration source side and the support side, a second fixture attached to the other of the vibration source side and the support side, and an intermediate between the first fixture and the second fixture. An anti-vibration base made of a rubber-like elastic body, a main liquid chamber in which a liquid in which the anti-vibration base forms a part of a chamber wall, and a diaphragm made of a rubber-like elastic body cover a part of the chamber wall. A liquid enclosure comprising: a sub liquid chamber in which a liquid to be formed is enclosed; a partition that partitions the main liquid chamber and the sub liquid chamber; and an orifice channel that communicates the main liquid chamber and the sub liquid chamber. In the type vibration isolator,
The partition body includes an elastic partition film that partitions the main liquid chamber and the sub liquid chamber without flowing a liquid, and a pair of sandwiching members that sandwich the peripheral portion of the elastic partition film from both sides. ,
The pair of clamping members includes a pair of displacement restricting portions that restrict the amount of displacement of the flexible portion inside the peripheral edge of the elastic partition membrane from both sides of the elastic partition membrane,
The flexible portion of the elastic partition membrane is provided with a thin cylindrical buffer portion protruding from the membrane surface toward the displacement regulating portion ,
The gap between the membrane surface of the elastic partition membrane main body excluding the buffer portion and the displacement restricting portion is set larger toward the inner side in the radial direction of the displacement restricting portion,
A plurality of the buffering portions are provided concentrically with respect to the axis of the flexible portion, and the protrusion height from the film surface is formed to be larger as the inner buffering portion is formed. . Wherein the displacement restricting portion, the hydraulic antivibration according to claim 1, wherein a projection limiting the movement in the radial direction of the buffer section in the radial position between the plurality of the buffer portion is provided apparatus. A first fixture attached to one of the vibration source side and the support side, a second fixture attached to the other of the vibration source side and the support side, and an intermediate between the first fixture and the second fixture. An anti-vibration base made of a rubber-like elastic body, a main liquid chamber in which a liquid in which the anti-vibration base forms a part of a chamber wall, and a diaphragm made of a rubber-like elastic body cover a part of the chamber wall. A liquid enclosure comprising: a sub liquid chamber in which a liquid to be formed is enclosed; a partition that partitions the main liquid chamber and the sub liquid chamber; and an orifice channel that communicates the main liquid chamber and the sub liquid chamber. In the type vibration isolator,
The partition body includes an elastic partition film that partitions the main liquid chamber and the sub liquid chamber without flowing a liquid, and a pair of sandwiching members that sandwich the peripheral portion of the elastic partition film from both sides. ,
The pair of clamping members includes a pair of displacement restricting portions that restrict the amount of displacement of the flexible portion inside the peripheral edge of the elastic partition membrane from both sides of the elastic partition membrane,
The flexible portion of the elastic partition membrane is provided with a plurality of thin-walled cylindrical buffer portions that protrude from the membrane surface toward the displacement restricting portion, concentrically with respect to the axis of the flexible portion,
The liquid sealing type vibration damping device, wherein the displacement restricting portion is provided with a protrusion that restricts a radial movement of each buffer portion at a radial position between the plurality of buffer portions . The buffer portion is liquid-sealed as claimed in any one of claims 1 to 3, characterized in that provided at least one in 50% of the diameter of the flexible portion about said axis Type vibration isolator. The liquid-filled type prevention according to any one of claims 1 to 4 , wherein the buffer portion is formed in a thin cylindrical shape having a protruding height from the film surface that is twice or more the thickness. Shaker. Hydraulic antivibration device according to any one of claims 1 to 5, characterized in that said inner membrane portion reinforcing rib of the buffer section is provided.

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