JP5462470B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator that is applied to, for example, automobiles and industrial machines and absorbs and attenuates vibrations of a vibration generating unit such as an engine.

As this type of vibration isolator, an outer cylinder connected to one of the vibration generating part and the vibration receiving part, an inner cylinder connected to the other, and an elasticity for elastically connecting these two cylinders And a partition member that divides the inside of the outer cylinder into a main liquid chamber on one side and a sub liquid chamber on the other side, wherein the elastic body is a part of the partition wall, and the partition member includes A configuration is known in which a cylindrical partition member main body is provided, and a restriction passage that extends along the circumferential direction and communicates the main liquid chamber and the sub liquid chamber is formed on the outer peripheral surface of the partition member main body. ing.
In addition, one of the peripheral end openings of the restriction passages that are separately opened to the main liquid chamber and the sub liquid chamber is a partition member body that constitutes a part of the partition wall of the main liquid chamber. It is formed in the inner peripheral surface, and the top view shape of the inner peripheral surface of this partition member main body is a single circular arc shape in almost the whole area except for the portion where the one peripheral end opening is located.
JP 2008-138773 A

However, in the conventional vibration isolator, the inner peripheral surface shape of the partition member main body is a single arc shape except for the portion where the one peripheral end opening is located. When the one peripheral end opening is reached along the inner peripheral surface of the partition member main body, it may pass through the peripheral end opening without flowing into the restricting passage, and the liquid in the partition member main body may be passed through. There is a possibility that it cannot efficiently flow into the restriction passage from one of the peripheral end openings.
Therefore, there is a problem that it is difficult to further improve the damping performance of the vibration isolator.

  The present invention has been made in consideration of such circumstances, and an object thereof is to provide a vibration isolator capable of improving the damping performance.

In order to solve the above-described problems and achieve such an object, the vibration isolator of the present invention is connected to an outer cylinder connected to one of a vibration generator and a vibration receiver, and to the other. An inner cylinder, an elastic body that elastically connects the two cylinders, an inner side of the outer cylinder, a main liquid chamber on one side having the elastic body as a part of a partition wall, and a secondary liquid on the other side A partition member that divides the chamber, and the partition member includes a cylindrical partition member main body, and the partition member main body that is present on the outer side in the radial direction of the partition member main body includes A liquid-filled vibration isolator having a restriction passage extending along the circumferential direction and communicating between the main liquid chamber and the sub liquid chamber, wherein the main liquid chamber and the sub liquid chamber are opened separately. At least one of the peripheral end openings of the restriction passage has the above-mentioned finish. Ri is formed on the inner peripheral surface of the partition member main body that exists in the inside of the radial direction of the member body, of the inner peripheral surface, the introduction portion connected to the peripheral end opening of the one that the radius than other portions Bulging outward in the direction, and the introduction portion in the inner peripheral surface is connected to one peripheral end surface located in the one peripheral end opening portion of both peripheral end surfaces of the restriction passage. .

  In this invention, since the introduction portion bulges outward in the radial direction from the other portion on the inner peripheral surface of the partition member main body, the liquid in the partition member main body flows on the inner peripheral surface of the partition member main body. In the process of flowing along the introduction portion and toward one of the peripheral end openings, the flow direction of the liquid can be inclined outward in the radial direction when passing through the introduction portion. Therefore, the liquid in the partition member main body efficiently flows into the restriction passage from the one peripheral end opening, and the damping performance of the vibration isolator can be improved.

Here, in the restriction passage, the one circumferential end opening and the one circumferential end connected to the circumferential end opening from the outside in the radial direction may be blocked from both sides in the axial direction of the partition member body. Good.
In this case, since the one peripheral end opening and the one peripheral end in the restriction passage are closed from both sides in the axial direction, the liquid that has reached the one peripheral end opening in the partition member body, or It is possible to make it difficult for the liquid that has reached the one peripheral end opening from the other peripheral end opening in the restricting passage to be dispersed in the axial direction. Therefore, the liquid that has reached the one peripheral end opening can be quickly allowed to flow into the restricting passage and the partition member main body without disturbing the flow, and the liquid can be bidirectionally transferred between the two liquid chambers. It can be distributed well.

Further, of the two peripheral end surfaces of the restricting passage, one peripheral end surface defining the one peripheral end opening is gradually increased from the outside in the radial direction toward the inside of the restricting passage along the circumferential direction. It may extend outward and be connected to the introduction portion.
In this case, since the one circumferential end surface gradually extends toward the outside of the restriction passage along the circumferential direction from the outside in the radial direction toward the inside, the liquid in the partition member body is allowed to flow through the one side. It becomes possible to flow more efficiently into the restriction passage from the peripheral end opening.
In addition, in this way, the one peripheral end surface gradually extends toward the outside of the restriction passage along the circumferential direction as it goes from the outside in the radial direction to the inside, so that the other peripheral end in the restriction passage When the liquid flowing in from the opening flows into the partition member main body from one peripheral end opening, it is possible to prevent the flow from being disturbed by colliding with the one peripheral end surface.
Furthermore, since the one peripheral end surface gradually extends toward the outside of the restricting passage along the circumferential direction as it goes from the outside in the radial direction to the inside, the liquid in the restricting passage causes the liquid in the restricting passage to In the process of flowing into the partition member main body from the peripheral end portion through one peripheral end opening, the flow passage cross-sectional area gradually increases, and the flow velocity of the liquid can be gradually decreased. In the process in which the liquid in the main body flows into the restriction passage from one peripheral end opening, the flow path cross-sectional area gradually decreases, and the flow rate of the liquid can be gradually increased.
Therefore, when the liquid in the restriction passage flows into the partition member main body, the flow velocity rapidly decreases, and when the liquid in the partition member main body flows into the restriction passage, the flow velocity increases rapidly. It is possible to suppress both of them, and the liquid can be circulated better in both directions between the two liquid chambers.
Furthermore, since the rapid increase in the flow velocity when the liquid in the partition member main body flows into the restriction passage as described above can be suppressed, the occurrence of cavitation in the restriction passage can be suppressed.

Furthermore, one peripheral end opening of the restriction passage may open to the main liquid chamber.
In this case, the above-mentioned action and effect are surely achieved.

  According to the present invention, the attenuation performance can be improved.

  Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the vibration isolator 10 includes an outer cylinder 11 connected to one of a vibration generating part and a vibration receiving part, an inner cylinder 12 connected to the other, and both of these. A rubber elastic body (elastic body) 13 that elastically connects the cylinders 11 and 12, a main liquid chamber 17 on one side having the rubber elastic body 13 as a part of a partition, and the other side inside the outer cylinder 11 And a partition member 15 that partitions the sub-liquid chamber 18.

Each of these members is formed in a circular shape or an annular shape when viewed from above, and each central axis is disposed on a common axis. Hereinafter, this common axis is referred to as an axis O.
When the vibration isolator 10 is mounted on, for example, an automobile, the inner cylinder 12 is connected to the engine side as the vibration generating unit, while the outer cylinder 11 is connected to the vehicle body side as the vibration receiving unit. The engine vibration can be suppressed from being transmitted to the vehicle body.

The outer cylinder 11 has one end side portion in the axis O direction as a large diameter portion 11a, and the other end side portion in the axis O direction as a small diameter portion 11b formed to have a smaller diameter than the large diameter portion 11a. These 11a and 11b are configured to be connected via a constricted portion 11c constricted toward the inside of the mounting member 11 in the radial direction.
Hereinafter, in the outer cylinder 11, the large diameter portion 11 a side is referred to as the upper side along the axis O direction, and the small diameter portion 11 b side is referred to as the lower side.
The throttle portion 11 c extends continuously over the entire circumference of the outer cylinder 11. Further, the outer cylinder 11 is connected to the vehicle body side via the vehicle body side bracket by fitting the large diameter portion 11a into a cylindrical portion of the vehicle body side bracket (not shown).

The inner cylinder 12 is formed in a column shape. The lower part of the inner cylinder 12 is gradually reduced in diameter as it goes downward, and its lower end is formed in a convex curved shape downward. On the upper end surface of the inner cylinder 12, a female screw portion 12a is formed coaxially with the axis O. Further, an anchor portion 12b that protrudes outward in the radial direction is formed at an intermediate portion of the inner cylinder 12 in the axis O direction. And this inner cylinder 12 is fixed to the engine side bracket which is not shown in figure by the volt | bolt 24 being screwed by the internal thread part 12a, and is connected with the engine side via this bracket.
In addition, the inner cylinder 12 is disposed on the radially inner side of the large-diameter portion 11a of the outer cylinder 11 so as to protrude upward from the upper end opening surface of the large-diameter portion 11a.

  The rubber elastic body 13 closes the upper end opening of the outer cylinder 11. In the illustrated example, the rubber elastic body 13 is vulcanized and bonded to the inner peripheral surfaces of the large diameter portion 11a and the narrowed portion 11c of the outer cylinder 11 and the outer peripheral surface of the lower portion of the inner cylinder 12. Here, the anchor portion 12b is covered with a rubber cover 27, and the inner peripheral surface of the small diameter portion 11b of the outer cylinder 11 is covered with a rubber film 28. The rubber cover 27 and the rubber film 28 are rubber elastic bodies. 13 is formed integrally. The rubber covering 27 and the anchor portion 12b constitute a rebound stopper. Further, an inner ring 13 a is embedded in the rubber elastic body 13 coaxially with the axis O.

  Here, the lower end opening of the outer cylinder 11 is closed by the diaphragm 14. In the illustrated example, the diaphragm 14 includes a cylindrical diaphragm ring 30 and a diaphragm rubber 31 that closes the inside of the diaphragm ring 30. The diaphragm rubber 31 is formed in a bowl shape, and its outer edge is vulcanized and bonded to the inner peripheral surface of the diaphragm ring 30. When the diaphragm 14 having such a configuration is fitted into the small diameter portion 11b of the outer cylinder 11, the lower end portion of the diaphragm ring 30 is crimped radially inward over the entire circumference together with the lower end portion of the small diameter portion 11b. It is fixed by. The rubber film 28 is interposed between the outer peripheral surface of the diaphragm ring 30 and the inner peripheral surface of the small diameter portion 11b of the outer cylinder 11.

As described above, inside the outer cylinder 11 closed by the rubber elastic body 13 and the diaphragm 14, for example, a liquid such as ethylene glycol or water is sealed. Further, the inside of the outer cylinder 11 is partitioned by a partition member 15 into an upper main liquid chamber 17 and a lower sub liquid chamber 18. The main liquid chamber 17 has a rubber elastic body 13 as a part of the partition wall, and its internal volume changes due to the deformation of the rubber elastic body 13, and the sub liquid chamber 18 has a diaphragm 14 as a part of the partition wall. The inner volume changes due to the deformation of the diaphragm rubber 31.
In the illustrated example, the vibration isolator 10 is a compression type that is attached and used so that the main liquid chamber 17 is positioned on the upper side in the vertical direction and the sub liquid chamber 18 is positioned on the lower side in the vertical direction. .

The partition member 15 is fitted in the small diameter portion 11 b of the outer cylinder 11. The partition member 15 includes a cylindrical partition member main body 41, a membrane 42 disposed below the partition member main body 41, and a membrane storage member 43 that stores the membrane 42.
The partition member main body 41 is provided with a bottom plate portion 41b, and a plurality of through holes 46 are formed in the bottom plate portion 41b. In addition, a restriction passage 40 that extends along the circumferential direction and communicates the main liquid chamber 17 and the sub liquid chamber 18 is formed on the outer peripheral surface of the partition member main body 41. The restriction passage 40 constitutes an orifice. In the illustrated example, the restriction passage 40 is formed at the same position in the axis O direction on the outer peripheral surface of the partition member main body 41 over the entire circumference. Further, the restriction passage 40 is formed in an area of less than 360 ° (about 300 ° in the illustrated example) around the axis O on the outer peripheral surface of the partition member main body 41.

  One peripheral end opening 44 that opens into the main liquid chamber 17 in the restriction passage 40 is formed on the inner peripheral surface 41 a of the partition member main body 41 that constitutes a part of the partition wall of the main liquid chamber 17. As shown in FIG. 3, the other peripheral end opening 45 that opens to the auxiliary liquid chamber 18 in the restriction passage 40 is formed in a lower side wall portion 41 g that closes the restriction passage 40 from below. Accordingly, in the illustrated example, one peripheral end opening 44 opens to the main liquid chamber 17 toward the inside in the radial direction, and the other peripheral end opening 45 extends downward to the sub liquid chamber 18. Open. The restriction passage 40 is closed by the rubber film 28 from the outside in the radial direction of the partition member main body 41. Further, the lower surface of the bottom plate portion 41b and the lower surface of the lower side wall portion 41g in the partition member main body 41 are flush with each other.

  In the illustrated example, the restriction passage 40 is a shake orifice corresponding to a shake vibration in a vehicle, and the flow path length and the flow passage cross-sectional area of the restriction passage 40, that is, the flow passage resistance is determined by the shake vibration frequency (for example, It is tuned so that liquid column resonance occurs at about 8 to 12 Hz.

As shown in FIG. 1, the membrane housing member 43 is formed in a bottomed cylindrical shape and is attached to the lower side of the partition member main body 41. Further, a flange portion 43 c is projected from the upper end opening edge of the peripheral wall portion 43 b of the membrane housing member 43 over the entire circumference, and the upper surface of the flange portion 43 c is attached to the partition member main body 41. Further, a plurality of through holes 47 are formed in the bottom plate portion 43 a of the membrane housing member 43. The partition member 15 is fixed with the outer peripheral edge portion of the partition member main body 41 and the flange portion 43c of the membrane housing member 43 sandwiched in the direction of the axis O by the throttle portion 11c of the outer cylinder 11 and the diaphragm ring 30 of the diaphragm 14. Has been. Further, a hole (not shown) that is substantially the same shape and size as the other peripheral end opening 45 is formed at a position corresponding to the other peripheral end opening 45 in the flange portion 43 c of the membrane housing member 43.
The membrane 42 is a circular rubber plate and is accommodated in a space surrounded by the bottom plate portion 41 b of the partition member main body 41 and the peripheral wall portion 43 b and the bottom plate portion 43 a of the membrane accommodating member 43.

  Here, in the inner peripheral surface 41a of the partition member main body 41, the introduction portion 41f connected to the one peripheral end opening 44 from the outside of the restriction passage 40 along the circumferential direction is shown in FIG. 2 and FIG. Thus, it bulges outward in the radial direction from other parts. In the illustrated example, the shape of the introduction portion 41f in plan view is an arc shape having a smaller radius of curvature than the other portions. Further, the overall shape of the partition member main body 41 excluding the introduction portion 41f on the inner peripheral surface 41a of the partition member main body 41 is a single arc shape. The circumferential length of the introduction portion 41f is about 1/10 of the circumferential length of the restriction passage 40. Further, the entire inner peripheral surface 41a of the partition member main body 41 including the introduction portion 41f is formed in a concave curved surface shape that gradually extends inward in the radial direction from the upper side to the lower side. Further, as shown in FIG. 2, a portion of the upper end surface of the partition member main body 41 formed in a ring shape that is connected to the introduction portion 41 f is an introduction portion as compared with other portions excluding a closing portion 41 i described later. Corresponding to the bulging amount of 41f toward the outside in the radial direction, the size in the radial direction is reduced. The entire upper end edge of the inner peripheral surface 41 a of the partition member main body 41 including the introduction portion 41 f is continuous with the inner peripheral edge of the upper end surface of the partition member main body 41.

  Here, the restriction passage 40 includes the other peripheral end opening 45 that opens to the auxiliary liquid chamber 18 and the other peripheral end of the restriction passage 40 that is connected to the other peripheral end opening 45 from above. The entire region excluding the end 40e is closed from both sides in the axis O direction. Note that the upper surface of the upper side wall portion 41 h that closes the restriction passage 40 from above constitutes a part of the upper end surface of the partition member body 41 described above.

Here, one of the peripheral end openings 44 is formed in a long rectangular shape along the circumferential direction, and an upper end edge thereof is a wall surface that faces the outside in the radial direction among the wall surfaces that define the restriction passage 40. Located at the boundary with the lower surface of the upper side wall portion 41h, the lower end edge is positioned at the boundary between the wall surface that defines the restriction passage 40 and the wall surface facing the outside in the radial direction and the upper surface of the lower side wall portion 41g. .
Further, in the illustrated example, in the upper side wall portion 41h, the one peripheral end opening portion 44 and a closed portion 41i that closes the one peripheral end portion 40d connected to the peripheral end opening portion 44 from the outside in the radial direction from above. The size in the radial direction gradually decreases from the inside to the outside of the restriction passage 40 along the circumferential direction.

  Further, in the present embodiment, as shown in FIG. 3, of the peripheral end surfaces 40 b and 40 c of the restriction passage 40, one peripheral end surface 40 b that defines one peripheral end opening 44 is the outer side in the radial direction. The introduction portion is formed so as to gradually extend toward the outside of the restriction passage 40 along the circumferential direction from the inside to the inside of the restriction passage 40 and to protrude toward the inside of the restriction passage 40 along the circumferential direction. 41f. One peripheral end surface 40b is smoothly connected to the introduction portion 41f from the inside of the restriction passage 40 along the circumferential direction without any step. The one peripheral end surface 40b is formed in a concave curved surface shape that gradually extends toward the inside of the restriction passage 40 along the circumferential direction as it goes from the upper side to the lower side.

  Next, the operation of the vibration isolator 10 having the above-described configuration will be described.

  In the vibration isolator 10 having the above-described configuration, the inner cylinder 12 is connected to the engine side via an unillustrated engine side bracket, and the outer cylinder 11 is connected to the vehicle body side via an unillustrated body side bracket. By this, it is interposed between the engine and the vehicle body. Thereby, a static load of the engine acts downward on the vibration isolator 10, the inner cylinder 12 moves downward relative to the outer cylinder 11, and the rubber elastic body 13 is elastically deformed along with this movement, and this rubber As the elastic body 13 is elastically deformed, the internal volume of the main liquid chamber 17 is reduced and the liquid pressure in the main liquid chamber 17 is increased. At this time, an internal pressure difference is generated between the main liquid chamber 17 and the sub liquid chamber 18, and the liquid in the main liquid chamber 17 passes through the restriction passage 40 and the above-described through holes 46 and 47 due to the internal pressure difference. As a result, the diaphragm 14 bulges downward as shown in FIG. 1 and the internal volume of the sub liquid chamber 18 increases.

  When the above-described engine is idled, the vibration is transmitted to the inner cylinder 12 of the vibration isolator 10 through the engine side bracket, and the vibration isolator 10 has a small amplitude and a high frequency range (for example, 13 Hz to 40 Hz). Idle vibration is input. In this case, the liquid does not pass through the restriction passage 40, and the membrane 42 is caused to vibrate up and down in response to the input vibration in the membrane housing member 43, thereby passing through the through holes 46 and 47 and the main liquid chamber 17. It flows between the auxiliary liquid chamber 18. Thereby, although the internal volume of the main fluid chamber 17 varies, the fluid pressure variation of the main fluid chamber 17, that is, the variation of the dynamic spring constant of the vibration isolator 10 is suppressed, and the vibration transmitted to the vehicle body side is reduced. The

  Further, when the driving of the engine is started, the vibration is transmitted to the inner cylinder 12 of the vibration isolator 10 via the engine side bracket, and the vibration isolator 10 has a relatively low frequency, that is, the above-described vibration. A shake vibration having a larger amplitude and smaller frequency (for example, 8 Hz to 15 Hz) than the high frequency region is input. In this case, as the inner cylinder 12 repeatedly moves upward and downward with respect to the outer cylinder 11 by shake vibration, the liquid pressure in the main liquid chamber 17 fluctuates, and the main liquid chamber 17 and the sub liquid chamber 18 An internal pressure difference occurs between the two. In this case, the membrane 42 comes into close contact with the bottom plate portion 41 b of the partition member main body 41 or the bottom plate portion 43 a of the membrane housing member 43, and the through hole 46 of the bottom plate portion 41 b of the limiting member 41 or the bottom plate portion 43 a of the membrane housing member 43. The through-hole 47 is closed. Thus, the liquid in the main liquid chamber 17 flows between the main liquid chamber 17 and the sub liquid chamber 18 through only the restriction passage 40. Further, since the restriction passage 40 is tuned so that the flow path length and the flow passage cross-sectional area correspond to the shake vibration, a resonance phenomenon (liquid column resonance) occurs in the liquid flowing through the restriction passage 40 and the shake vibration occurs. Is attenuated, and vibration transmitted to the vehicle body is reduced.

  As described above, according to the vibration isolator 10 according to the present embodiment, the introduction part 41f is more than the other part on the inner peripheral surface 41a of the partition member main body 41 constituting a part of the partition wall of the main liquid chamber 17. A process in which the liquid in the main liquid chamber 17 flows toward the one peripheral end opening 44 through the introduction portion 41f along the inner peripheral surface 41a of the partition member body 41 because the liquid swells outward in the radial direction. Thus, when passing through the introduction portion 41f, the flow direction of the liquid can be inclined outward in the radial direction. Therefore, the liquid in the main liquid chamber 17 efficiently flows into the restriction passage 40 from the one peripheral end opening 44, and the damping performance of the vibration isolator 10 can be improved.

  Further, since one peripheral end opening 44 and one peripheral end 40d in the restriction passage 40 are closed from both sides in the direction of the axis O, they reach one peripheral end opening 44 in the main liquid chamber 17. It is possible to make it difficult to disperse the liquid or the liquid that has reached the one peripheral end opening 44 from the other peripheral end opening 45 in the restriction passage 40 in the direction of the axis O. Accordingly, the liquid that has reached one of the peripheral end openings 44 can be quickly allowed to flow into the restriction passage 40 and the main liquid chamber 17 without disturbing the flow thereof, and the liquid can be supplied to both the liquid chambers 17 and 18. Good distribution in both directions.

Furthermore, since one circumferential end surface 40b of the restriction passage 40 gradually extends toward the outside of the restriction passage 40 along the circumferential direction from the outside in the radial direction toward the inside, the inside of the main liquid chamber 17 It becomes possible to allow the liquid to flow into the restriction passage 40 from one peripheral end opening 44 more efficiently.
Also, as described above, one circumferential end surface 40b gradually extends toward the outside of the restriction passage 40 along the circumferential direction as it goes from the outside in the radial direction to the inside. When the liquid flowing in from the peripheral end opening 45 flows into the main liquid chamber 17 from one peripheral end opening 44, it is possible to prevent the flow from being disturbed by colliding with one peripheral end surface 40b. become.

  Furthermore, since one circumferential end surface 40b gradually extends toward the outside of the restriction passage 40 along the circumferential direction as it goes from the outside in the radial direction to the inside, the liquid in the restriction passage 40 is In the process of flowing into the main liquid chamber 17 from the peripheral end portion 40d through the one peripheral end opening 44, the cross-sectional area of the flow path gradually increases, and the flow velocity of the liquid can be gradually decreased. Further, in the process in which the liquid in the main liquid chamber 17 flows into the restriction passage 40 from the one peripheral end opening 44, the flow path cross-sectional area gradually decreases, and the flow rate of the liquid can be gradually increased.

Therefore, when the liquid in the restriction passage 40 flows into the main liquid chamber 17, the flow velocity rapidly decreases, and when the liquid in the main liquid chamber 17 flows into the restriction passage 40, the flow velocity It is possible to suppress both of the sudden increase of the liquid, and the liquid can be circulated more favorably in both directions between the liquid chambers 17 and 18.
Furthermore, since the rapid increase of the flow velocity when the liquid in the main liquid chamber 17 flows into the restriction passage 40 as described above can be suppressed, the occurrence of cavitation in the restriction passage 40 can be suppressed. .
Furthermore, since the one peripheral end opening 44 of the restriction passage 40 is open to the main liquid chamber 17, the above-described operation and effect are reliably achieved.

As mentioned above, although the embodiment of the vibration isolator according to the present invention has been described, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof.
For example, although the compression type is shown as the vibration isolator 10 in the above-described embodiment, the vibration isolator 10 is attached and used so that the main liquid chamber 17 is positioned on the lower side in the vertical direction and the sub liquid chamber 18 is positioned on the upper side in the vertical direction. It can also be applied to a suspension type vibration isolator.
In addition, the vibration isolator according to the present invention is not limited to the engine mount of a vehicle, and can be applied to, for example, a generator mount mounted on a construction machine, or installed in a factory or the like. It is also possible to apply to the mounting of equipment to be used.
Further, the restriction passage 40 may be formed in a spiral shape along the circumferential direction on the outer peripheral surface of the partition member main body 41 in place of the embodiment, and may extend longer than 360 ° around the axis O. .
Moreover, you may employ | adopt the upper side wall part 41h which does not have the said obstruction | occlusion part 41i.

Further, as shown in FIGS. 4 and 5, on the inner peripheral surface 41 a of the partition member main body 41, an inner portion 41 c that continues from the inner side of the restriction passage 40 along the circumferential direction to the one peripheral end opening 44 is provided. The flat surface may be parallel to the axis O.
In this configuration, as shown in FIGS. 4 and 5, the inner wall located at the inner end of the restriction passage 40 along the circumferential direction among the wall surfaces defining the one peripheral end opening 44. The connecting portion 32 between the end surface 41e and the inner portion 41c may be formed in a convex curved shape toward the outside of the restriction passage 40 along the circumferential direction.
Further, in this configuration, of the inner peripheral surface 41a of the partition member main body 41, the outer end portion of the restriction passage 40 along the circumferential direction in the introduction portion 41f and the restriction passage 40 along the circumferential direction in the inner portion 41c. The planar view shape of the portion located between the inner end portion and the inner end portion may be a single arc shape.
Further, in this configuration, the radially inner end edge of the upper wall portion 41h in the portion that continues from the inside of the restriction passage 40 along the circumferential direction to the closed portion 41i is a plan view of the partition member body 41. It may extend along the inner portion 41c. In other words, the radially inner edge of the upper wall 41h that extends from the inside of the restriction passage 40 along the circumferential direction to the closed portion 41i may coincide with the upper edge of the inner portion 41c. .
Further, in this configuration, as shown in FIGS. 4 and 5, the radially inner edge of the inner end of the restriction passage 40 along the circumferential direction in the closed portion 41i is the partition member body. 41 may extend along the connecting portion 32 in a plan view. That is, the inner edge in the radial direction at the inner edge of the restriction passage 40 along the circumferential direction in the closed portion 41 i may coincide with the upper edge of the connection portion 32. Instead of forming the connecting portion 32 in a convex curved surface shape, it may be formed in, for example, an inclined surface shape.

In the above embodiment, one peripheral end opening 44 is formed in the inner peripheral surface 41 a of the partition member main body 41 that constitutes a part of the partition wall of the main liquid chamber 17, and the introduction portion 41 f is in the main liquid chamber 17. Although the formed structure is shown, instead of this, the inner peripheral surface 41a of the partition member main body 41 constitutes a part of the partition wall of the secondary liquid chamber 18, and the introduction part 41f is formed in the secondary liquid chamber 18. The configuration may be adopted, or the inner peripheral surface 41a of the partition member main body 41 is divided into two along the axis O direction by the bottom plate portion 41b, and the main liquid chamber 17 is formed in each of these divided portions. And a part of the partition wall of each of the sub liquid chambers 18 and both peripheral end openings 44 and 45 are formed separately, and an introduction portion 41 f is formed in both the main liquid chamber 17 and the sub liquid chamber 18. Also good.
In the above-described embodiment, the rubber elastic body 13 is shown as an elastic body that connects the outer cylinder 11 and the inner cylinder 12 to each other. However, an elastic body made of, for example, synthetic resin may be used instead.

Further, the partition member main body 41 may be provided with a plate-like valve body in which one end in the longitudinal direction is a fixed end and the other end is a free end.
For example, as shown in FIG. 6, a plate extending toward the outside of the restriction passage 40 along the circumferential direction on the inner portion 41 c of the inner circumferential surface 41 a of the partition member main body 41 shown in FIGS. 4 and 5. The valve body 48 may be provided so as to be elastically deformable in the radial direction of the partition member main body 41. The valve body 48 is a spring plate made of a thin plate made of a metal material such as stainless steel, and is a member that can be elastically bent and deformed in the plate thickness direction.
When the load is input to the vibration isolator 10 and the hydraulic pressure in the main fluid chamber 17 increases, the distal end portion 48a of the valve body 48 that faces the one peripheral end opening 44 from the inside in the radial direction. However, as indicated by a two-dot chain line in FIG. 6, the restriction passage 40 may be narrowed or closed by being elastically deformed outward in the radial direction. That is, the tip side portion 48a of the valve body 48 opens the restriction passage 40 in a normal time when no load is input to the vibration isolator 10, and the load is input to the vibration isolator 10 and the main liquid chamber 17 is opened. When the hydraulic pressure increases, the restriction passage 40 may be narrowed or closed by entering the one peripheral end portion 40d from the one peripheral end opening portion 44.
In the illustrated example, the base end side portion 48b located on the inner portion 41c in the valve body 48 is formed in a flat shape, and is fixed to the inner portion 41c by a fixing member 49 such as a rivet. A plurality of fixing members 49 are arranged at intervals in the circumferential direction of the partition member main body 41. Further, the distal end side portion 48 a of the valve body 48 is formed in an arc shape along the planar view shape of the inner peripheral surface 41 a of the partition member main body 41.

  Instead of the valve body 48 shown in FIG. 6, for example, a valve body bent so that the distal end side portion 48a is located on the outer side in the radial direction with respect to the proximal end side portion 48b may be adopted. Alternatively, a flat plate-like valve body extending in parallel along the inner portion 41c may be adopted, and furthermore, the valve body may be provided on the partition member main body 41 shown in FIGS.

  In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

  Attenuation performance can be improved.

It is a longitudinal section of a vibration isolator shown as one embodiment concerning the present invention. It is a top view of the partition member shown in FIG. It is a cross-sectional view of the partition member shown in FIG. It is a top view of the partition member of the vibration isolator shown as other embodiment concerning the present invention. It is a cross-sectional view of the partition member of the vibration isolator shown as other embodiment which concerns on this invention. It is a cross-sectional view of the partition member of the vibration isolator shown as further another embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Anti-vibration apparatus 11 Outer cylinder 12 Inner cylinder 13 Rubber elastic body 15 Partition member 17 Main liquid chamber 18 Sub liquid chamber 40 Restriction passage 40b One peripheral end surface 40c The other peripheral end surface 40d One peripheral end portion 40e The other peripheral end portion 41 partition member main body 41a inner peripheral surface of partition member main body 41f introduction part 44 one peripheral end opening 45 other peripheral end opening

Claims (4)

An outer cylinder connected to one of the vibration generating part and the vibration receiving part, and an inner cylinder connected to the other;
An elastic body that elastically connects these two cylinders;
A partition member that divides the inside of the outer cylinder into a main liquid chamber on one side having the elastic body as a part of a partition, and a sub liquid chamber on the other side;
The partition member is provided with a cylindrical partition member main body, and extends along the circumferential direction on the outer peripheral surface of the partition member main body existing outside in the radial direction of the partition member main body. A liquid-filled vibration isolator in which a restriction passage communicating with the sub liquid chamber is formed,
At least one of the peripheral end openings of the restricting passage that opens separately to the main liquid chamber and the sub liquid chamber has a partition member main body that exists radially inside the partition member main body. Formed on the inner peripheral surface of
Of the inner peripheral surface, the introduction portion connected to the one peripheral end opening bulges outward in the radial direction from the other portion,
The anti-vibration device according to claim 1, wherein the introduction portion in the inner peripheral surface is connected to one peripheral end surface located at the one peripheral end opening portion of both peripheral end surfaces of the restriction passage . The vibration isolator according to claim 1,
In the restriction passage, the one peripheral end opening and the one peripheral end connected to the peripheral end opening from the outside in the radial direction are closed from both sides in the axial direction of the partition member body. Anti-vibration device. The vibration isolator according to claim 1 or 2,
Of the two peripheral end surfaces of the restriction passage, one peripheral end surface defining the one peripheral end opening is gradually formed on the outer side of the restriction passage along the circumferential direction from the outside in the radial direction toward the inside. An anti-vibration device that extends toward and is connected to the introduction portion. The vibration isolator according to any one of claims 1 to 3,
The vibration isolator according to claim 1, wherein one of the peripheral end openings of the restriction passage opens into the main liquid chamber.

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