JP2010223406A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device improving productivity. <P>SOLUTION: The liquid sealing type vibration control device 1 is equipped with: a cylindrical first mounting member 3 connected to either one of a vibration generating part or a vibration receiving part; a second mounting member 2 connected to the other; an elastic body 4 elastically connecting the first mounting member 3 and the second mounting member 2; a partition member 7 partitioning a liquid chamber 6 in the first mounting member 3 into a main liquid chamber 6A and a sub liquid chamber 6B; and a diaphragm 5 forming one part of a wall surface of the sub liquid chamber 6B, and it is also provided with a limiting passage 80 communicating the main liquid chamber 6A with the sub liquid chamber 6B. The partition member 7 is equipped with a limiting passage member 8 fitted in an inner side of the first mounting member 3 and provided with the limiting passage 80, the limiting passage member 8 is formed of hard thermoplastic resin, the diaphragm 5 is formed of thermoplastic elastomer, and its outer edge part is joined to the limiting passage member 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is used when mounting a vibration generating unit such as an automobile engine on a vibration receiving unit such as a vehicle body.

Conventionally, as this type of vibration isolator, a cylindrical first mounting member connected to one of a vibration generating unit and a vibration receiving unit, a second mounting member connected to the other, An elastic body that elastically connects the mounting member and the second mounting member, a liquid chamber in the first mounting member, and a main liquid chamber on one side and a sub liquid chamber on the other side with the elastic body as part of the wall surface There is known a configuration including a partition member that is divided into two and a diaphragm that forms a part of the wall surface of the auxiliary liquid chamber. The partition member described above is provided with a restriction passage member in which a restriction passage for communicating the main liquid chamber and the sub liquid chamber is formed. The diaphragm described above includes a pressed metal diaphragm ring and a diaphragm rubber which is vulcanized and bonded to the diaphragm ring and formed inside the diaphragm ring. In the vibration isolator having such a configuration, after the partition member is fitted inside the first mounting member, the diaphragm is fitted inside the first mounting member so that the diaphragm ring is superimposed on the restriction passage member. And then assembled by crimping and fixing the end of the first mounting member to the diaphragm ring.

  Conventionally, as shown in Patent Document 1, a vibration isolator having a configuration in which an outer peripheral portion of a rubber diaphragm is vulcanized and bonded to a restriction passage member has been proposed. A locking plate superimposed on the restriction passage member is in contact with the outer peripheral portion of the diaphragm described above, and the outer peripheral portion of the diaphragm is pressed by this locking plate.

JP 2003-222183 A

However, in the conventional technique for assembling the diaphragm having the diaphragm ring to the first mounting member, the assembly of the partition member and the diaphragm to the first mounting member with respect to the first mounting member (assembly), the assembly man-hours are large, There is a problem that productivity (mass productivity) is low.

Further, in the conventional technique in which the outer peripheral portion of the rubber diaphragm is vulcanized and bonded to the restriction passage member, since the rubber diaphragm is vulcanized and molded, there is a problem that the molding time of the diaphragm is long and the productivity is low.

  Further, in both of the above-described conventional techniques, when a rubber diaphragm is vulcanized and bonded to a metal diaphragm ring, or when a rubber diaphragm is vulcanized and bonded to a restricted passage member, an adhesive base treatment or application of an adhesive is performed. However, there is a problem that man-hours are large and productivity is low.

  The present invention has been made in consideration of the above-described conventional problems, and an object thereof is to provide a vibration isolator capable of improving productivity.

The vibration isolator according to the present invention includes a cylindrical first mounting member connected to one of a vibration generating unit and a vibration receiving unit, a second mounting member connected to the other, and the first mounting An elastic body for elastically connecting the member and the second mounting member; a liquid chamber in the first mounting member; a main liquid chamber on one side and a sub-side on the other side having the elastic body as a part of a wall surface; A liquid enclosure comprising a partition member that divides into a liquid chamber and a diaphragm that forms a part of the wall surface of the sub liquid chamber, and a restriction passage that communicates the main liquid chamber and the sub liquid chamber is formed In the vibration isolator of the mold, the partition member is provided with a restriction passage member that is fitted inside the first attachment member and has the restriction passage formed therein, and the restriction passage member is made of a hard thermoplastic. Made of resin and the diaphragm is made of thermoplastic elastomer Formed at over, it is characterized in that the outer edge portion is bonded to the restricting passage member.

Due to such a feature, the diaphragm is joined to the restriction passage member. Therefore, the diaphragm is attached to the first attachment member by assembling the partition member including the restriction passage member to the first attachment member. At this time, since the restriction passage member made of the hard thermoplastic resin has sufficient hardness, the restriction passage member is not elastically deformed when the partition member is assembled to the first mounting member. In addition, the diaphragm made of thermoplastic elastomer and the restricted passage member made of hard thermoplastic resin can be joined by two-color molding, welding, or the like, not by vulcanization bonding that requires adhesive base treatment or application of an adhesive. In addition, a diaphragm made of a thermoplastic elastomer can be molded in a shorter time than when a rubber material is vulcanized.
Further, when the internal pressure of the main liquid chamber changes due to the vibration of the vibration generating unit, along with the change of the internal pressure, liquid flows between the main liquid chamber and the sub liquid chamber through the restriction passage, and the vibration is generated. Attenuated. At this time, since the diaphragm made of the thermoplastic elastomer has sufficient flexibility (softness), when the liquid moves from the main liquid chamber to the sub liquid chamber through the restriction passage, the diaphragm deforms and the sub liquid chamber The internal volume is expanded. Therefore, even when a large vibration is input, an increase in the internal pressure of the sub liquid chamber is suppressed, the liquid flows through the restriction passage described above, and a vibration damping effect is exhibited.

Further, in the vibration isolator according to the present invention, the base polymer of the hard thermoplastic resin forming the restriction passage member and the base polymer of the thermoplastic elastomer forming the diaphragm are bonded to each other in a molten state by two-color molding. It is preferable that the restriction passage member and the diaphragm are two-color molded.

  Accordingly, the restriction passage member and the diaphragm are directly joined by two-color molding of the restriction passage member made of the hard thermoplastic resin and the diaphragm made of the thermoplastic elastomer. At this time, the boundary surface between the restricting passage member and the diaphragm is in a phase-melted state, and adhesion at the boundary surface between the restricting passage member and the diaphragm is ensured without using an adhesive or the like.

In the vibration isolator according to the present invention, ethylene-propylene-diene rubber is preferably used as the elastomer component of the thermoplastic elastomer forming the diaphragm.

  Thereby, the weather resistance and heat resistance of the diaphragm are improved.

  According to the vibration isolator of the present invention, the diaphragm is joined to the restriction passage member, and the partition member having the restriction passage member is assembled to the first attachment member, thereby opening the other end side of the first attachment member. Since the diaphragm is installed at the end, the process of assembling the diaphragm is omitted, and the assembly man-hour of the vibration isolator can be reduced. Moreover, when joining the diaphragm which consists of thermoplastic elastomers, and the restriction | limiting channel | path member which consists of hard thermoplastic resins, adhesion | attachment base treatment and application | coating of an adhesive agent can be abbreviate | omitted. In addition, a diaphragm made of a thermoplastic elastomer can be molded in a shorter time than when a rubber material is vulcanized. As described above, the productivity of the vibration isolator can be improved.

It is sectional drawing of the vibration isolator for demonstrating embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a vibration isolator according to the present invention will be described with reference to the drawings.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a vibration isolator according to the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a vibration isolator 1 in the present embodiment.
Further, in the present embodiment, the lower side in FIG. 1 is the bounce side, that is, the direction in which a static load (initial load) is input when the vibration isolator 1 is installed, and the upper side in FIG. This is the opposite side of the static load input direction.

  The vibration isolator 1 is used when an engine, which is an example of a vibration generating unit, is mounted on a vehicle body, which is an example of a vibration receiving unit, and is a device for attenuating the vibration of the vibration generating unit. As shown in FIG. 1, the vibration isolator 1 includes an inner cylinder 2 (corresponding to a second mounting member in the present invention) and an outer cylinder 3 (corresponding to the first mounting member in the present invention) arranged on the same axis L. And an elastic body 4 that is integrally molded with the inner cylinder 2 and the outer cylinder 3 by vulcanization adhesion. In FIG. 1, reference numeral 10 denotes a cylindrical inner ring that is integrally vulcanized and bonded to the elastic body 4.

The inner cylinder 2 is a member connected to an engine (not shown) via an engine side bracket (not shown). More specifically, the inner cylinder 2 includes a head 20 that protrudes toward the rebound side, a barrel 21 that is suspended from the lower end of the head 20 toward the bound, and a radial direction from the outer peripheral surface of the intermediate portion of the inner cylinder 2. And a flange portion 22 projecting outward. The inner cylinder 2 is formed with a bottomed female thread portion 2 a extending from the upper end of the head portion 20 to the bound side. An unillustrated engine-side bracket attached to the engine (not shown) is attached to the head 20 by a not-shown bolt screwed into the female screw portion 2a. The trunk | drum 21 is embed | buried in the elastic body 4, is gradually diameter-reduced as it goes to the bound side, and the front-end | tip is rounded spherically. The flange portion 22 is formed over the entire outer peripheral surface of the inner cylinder 2, and the flange portion 22 is covered with a covering rubber 23 that is molded integrally with the elastic body 4. The covering rubber 23 is formed so as to wrap around the flange portion 22 from the lower side of the flange portion 22 to the upper side via the outside.

  The outer cylinder 3 is a member that is fitted and attached to the inside of a cylindrical portion of a vehicle body side bracket (not shown), and is a member that is connected to a vehicle body (not shown) via a vehicle body side bracket (not shown). More specifically, the outer cylinder 3 includes a small-diameter portion 30 on the bounce side, a large-diameter portion 31 on the rebound side, and a throttle that is interposed between the small-diameter portion 30 and the large-diameter portion 31 and protrudes radially inward. Part 32. An inner peripheral rubber 33 for covering the inner peripheral surface of the small diameter portion 30 over the entire circumference is vulcanized and bonded to the inner peripheral surface of the small diameter portion 30. Further, a step rubber 34 projecting radially inward from the inner peripheral surface of the inner peripheral rubber 33 is vulcanized and bonded to the inner peripheral surface of the narrowed portion 32. That is, a step rubber 34 having an inner diameter smaller than that of the inner peripheral rubber 33 is formed above the inner peripheral rubber 33. Further, the inner rubber 33 and the step rubber 34 described above are each molded integrally with the elastic body 4. Further, a caulking portion 35 that is bent radially inward is formed at the lower end portion of the outer cylinder 3 (small diameter portion 30) over the entire circumference.

  The elastic body 4 is a member that elastically connects the inner cylinder 2 and the outer cylinder 3 and closes the open end of the outer cylinder 3 on the rebound side. More specifically, the elastic body 4 is a dome-shaped rubber body that closes the large-diameter portion 31 of the outer cylinder 3, and has an inner peripheral surface of the large-diameter portion 31 of the outer cylinder 3 and an outer periphery of the trunk portion 21 of the inner cylinder 2. It is interposed between the surfaces. As the elastic body 13, an elastic body made of synthetic resin or the like can be used in addition to rubber.

  In addition, a liquid chamber 6 in which a liquid such as ethylene glycol, water, or silicone oil is enclosed is formed inside the outer cylinder 3. The liquid chamber 6 is a chamber surrounded by the lower surface of the elastic body 4, the inner peripheral surface (inner peripheral rubber 33) of the outer cylinder 3, and the upper surface of a diaphragm 5 described later. A partition member 7 is disposed inside the liquid chamber 6, and the liquid chamber 6 is divided into a main liquid chamber 6A on the rebound side and a sub liquid chamber 6B on the bound side by the partition member 7 described above. Yes. The main liquid chamber 6 </ b> A is a chamber in which a part of the partition wall (upper wall) is formed of the elastic body 4, and the internal volume of the main liquid chamber 6 </ b> A changes due to deformation of the elastic body 4. The sub liquid chamber 6B is a chamber in which a part of the partition wall (lower wall) is formed by a diaphragm 5 described later, and the internal volume of the sub liquid chamber 6B is determined by a change in the liquid pressure (internal pressure) in the sub liquid chamber 6B. It changes when the diaphragm 5 is deformed.

  The partition member 7 described above is fitted inside the outer cylinder 3, and is sandwiched between the narrowed portion 32 (step rubber 34) and the caulking portion 35 of the outer cylinder 3. The partition member 7 serves as a restriction passage member 8 in which a restriction passage 80 that communicates the main liquid chamber 6A and the sub liquid chamber 6B is formed, and a part of the partition wall (lower wall) of the main liquid chamber 6A. A membrane 9 stretched so as to be a part (upper wall) of the partition wall of the auxiliary liquid chamber 6B, and a holding member 11 for holding the membrane 9 are provided.

  The restriction passage member 8 is an annular member having a concave groove formed on the outer peripheral surface, and is fitted inside the small diameter portion 30 of the outer cylinder 3. More specifically, the restricting passage member 8 has a cylindrical shape 81 that is coaxially disposed with the small diameter portion 30 of the outer cylinder 3 and a flange shape that protrudes radially outward from the outer peripheral surface of the rebound side end of the cylindrical portion 81. And a flange-shaped lower wall portion 83 that protrudes radially outward from the outer peripheral surface of the bound side end portion of the cylindrical portion 81. A space surrounded by the outer peripheral surface of the cylindrical portion 81, the lower surface of the upper wall portion 82, the upper surface of the lower wall portion 83, and the inner peripheral surface (inner peripheral rubber 33) of the outer cylinder 3 is the restriction passage 80 described above. . The restriction passage 80 is a liquid path for attenuating the vibration by causing liquid column resonance (resonance phenomenon) in the liquid flowing through the restriction passage 80 when vibration is input to the vibration isolator 1. It is tuned to correspond to the frequency and amplitude of the shake vibration that is a resonance vibration of a large amplitude and a low frequency range (for example, 8 Hz to 15 Hz). The upper wall portion 82 is formed with an unillustrated outflow inlet that allows the restriction passage 80 and the main liquid chamber 6A to communicate with each other. The lower wall 83 is formed with an unillustrated outflow inlet that allows the restriction passage 80 and the auxiliary liquid chamber 6B to communicate with each other. Moreover, the restriction | limiting channel | path member 8 is formed with the hard thermoplastic resin. As the base polymer of the hard thermoplastic resin, for example, polypropylene (hereinafter referred to as PP), polyamide (hereinafter referred to as PA), or the like can be used.

  The holding member 11 is an annular member in plan view attached to the restriction passage member 8, and is a metal plate member pressed into a substantially hat shape so as to be fitted inside the restriction passage member 8. More specifically, the holding member 11 includes an annular bottom plate portion 11a, a cylindrical tube portion 11b erected from the outer edge of the bottom plate portion 11a, and a flange portion 11c protruding radially outward from the upper end of the tube portion 11b. And. The bottom plate portion 11a is disposed inside the restricting passage member 8, and the bottom plate portion 11a has an opening 11d that is circular in plan view. The cylinder part 11b is arrange | positioned inside the restriction | limiting channel | path member 8 (cylindrical part 81). The flange portion 11c is an annular plate portion formed over the entire circumference of the cylindrical portion 11b, and is placed on the upper surface of the restriction passage member 8 (upper wall portion 82). The outer peripheral portion of the flange portion 11c is sandwiched between the step rubber 34 of the outer cylinder 3 and the restriction passage member 8 (upper wall portion 82).

  The membrane 9 is an elastic member that closes the inside of the annular restriction passage member 8, and is a diaphragm that can be deformed in accordance with changes in the internal pressure of the main liquid chamber 6A or the sub liquid chamber 6B. More specifically, the membrane 9 is a disk-shaped member made of an elastic material such as rubber, and is disposed perpendicular to the central axis L of the outer cylinder 3. The membrane 9 is stretched inside the opening 11d of the bottom plate portion 11a of the holding member 11, and closes the opening 11d. The outer periphery of the membrane 9 is vulcanized and bonded to the bottom plate portion 11 a of the holding member 11 and connected to the holding member 11. Specifically, the bottom plate portion 11a of the holding member 11 is embedded inside the outer peripheral portion of the membrane 9, and the outer peripheral portion of the membrane 9 is vulcanized and bonded to the upper surface and the lower surface of the bottom plate portion 11a. The membrane 9 has a relatively high frequency generated when the vehicle is idling, that is, when idle vibration having a frequency higher than the low frequency range (for example, 13 Hz to 40 Hz) is input to the vibration isolator 1. In addition, it is tuned to absorb fluid pressure fluctuations in the main liquid chamber 6A and the sub liquid chamber 6B.

Further, the vibration isolator 1 is provided with a diaphragm 5 that forms a part of the partition wall of the liquid chamber 6. The diaphragm 5 is a member that can be deformed in accordance with a change in hydraulic pressure (internal pressure) in the sub-liquid chamber 6B described later. The diaphragm 5 includes an annular peripheral wall portion 50 joined to the restriction passage member 8, A film part 51 is provided which is stretched inside the peripheral wall part 50 and closes the peripheral wall part 50.

The peripheral wall portion 50 is a substantially cylindrical tube portion extending along the central axis L direction. At the upper end of the peripheral wall portion 50, a flange-like lower surface joint portion 52 that protrudes radially outward and is joined to the lower surface (lower wall portion 83) of the restriction passage member 8, and an upper portion along the central axis L And an inner peripheral surface joint portion 53 that projects toward the inner surface and is joined to the inner peripheral surface (cylindrical portion 81) of the restriction passage member 8. The lower surface joint portion 52 is an annular portion formed over the entire circumference of the peripheral wall portion 50. The inner peripheral surface joint portion 51 is a cylindrical portion formed over the entire circumference of the peripheral wall portion 50, and the inner peripheral surface of the inner peripheral surface joint portion 53 is formed flush with the inner peripheral surface of the peripheral wall portion 50. Has been.
The film part 51 is a round-plate-shaped dome that bulges to the rebound side. The outer edge of the film part 51 is connected to the inner peripheral surface of the peripheral wall part 50 over the entire periphery.

Further, the diaphragm 5 having the above-described configuration is formed of a thermoplastic elastomer, and this diaphragm 5 is formed integrally with the restriction passage member 8 by two-color molding. More specifically, the lower surface joint portion 52 of the diaphragm 5 is directly joined to the lower surface of the restriction passage member 8, and the inner peripheral surface joint portion 53 of the diaphragm 5 is directly joined to the inner peripheral surface of the restriction passage member 8. Thus, the diaphragm 5 is molded inside the restriction passage member 8.

In addition, as the thermoplastic elastomer forming the diaphragm 5, a thermoplastic elastomer having a polymer having an affinity for the base polymer of the hard thermoplastic resin forming the restriction passage member 8 as a base polymer is used. The above-mentioned “affinity” refers to a property in which both base polymers are bonded to each other in a molten state by two-color molding of the diaphragm 5 and the restriction passage member 8. Specifically, it is preferable that the base polymer of the rigid thermoplastic resin of the restriction passage member 8 and the base polymer of the thermoplastic elastomer of the diaphragm 5 are common, for example, when the restriction passage member 8 is formed of PP. The diaphragm 5 is preferably formed of a polypropylene-based thermoplastic elastomer. The base polymer of the rigid thermoplastic resin of the restriction passage member 8 and the base polymer of the thermoplastic elastomer of the diaphragm 5 may be different polymers, and different polymers having the above-mentioned “affinity” may be used. is there. Moreover, it is preferable to use ethylene-propylene-diene rubber (EPDM) as an elastomer component of the above-mentioned thermoplastic elastomer. That is, for example, when the restricting passage member 8 is formed of PP, the diaphragm 5 is preferably formed of a thermoplastic elastomer made of PP and EPDM.

  Next, the manufacturing method of the vibration isolator 1 which consists of an above-described structure is demonstrated.

First, a process of forming a vibration isolator body 12 including the outer cylinder 3, the inner cylinder 2, and the elastic body 4 is performed.
More specifically, first, the outer cylinder 3, the inner cylinder 2 and the inner cylinder in the mold (vibration isolator body mold) (not shown) for forming the elastic body 4, the inner peripheral rubber 33 and the step rubber 34. Each of the rings 10 is disposed at a predetermined position, and adhesive base treatment is performed on the inner peripheral surface of the outer cylinder 3, the surfaces of the body portion 21 and the flange portion 22 of the inner cylinder 2, and the inner and outer peripheral surfaces of the inner ring 10, respectively. And apply adhesive. Thereafter, unvulcanized rubber is injected into the above-described vibration isolator main body mold to mold the elastic body 4, and the inner peripheral rubber 33 and the step rubber 34 are respectively molded integrally with the elastic body 4. Subsequently, the elastic body 4 and the like are vulcanized by applying sulfur gas, pressure and heat to the elastic body 4 and the like, respectively. At this time, the elastic body 4 is vulcanized and bonded to the inner peripheral surface of the outer cylinder 3 (large diameter portion 31), the outer peripheral surface of the body portion 21 of the inner cylinder 2, and the inner and outer peripheral surfaces of the inner ring 10, respectively. The rubber 33 and the step rubber 34 are vulcanized and bonded to the inner peripheral surface of the outer cylinder 3 (small diameter portion 30, narrowed portion 32). And the anti-vibration device main body 12 is formed by removing the above-mentioned anti-vibration device main body mold.

Moreover, the process of forming the partition member 7 with which the diaphragm 5 was joined is performed.
Specifically, first, the membrane 9 is molded integrally with the holding member 11. More specifically, the holding member 11 is placed in a predetermined position in a mold (membrane mold) (not shown) for forming the membrane 9, and adhesive base treatment is applied to the upper and lower surfaces of the bottom plate portion 11a of the holding member 11. And apply adhesive. Thereafter, the membrane 9 is formed by injecting unvulcanized rubber into the membrane mold. Subsequently, the membrane 9 is vulcanized by applying sulfur gas, pressure and heat to the membrane 9, respectively. Then, after the membrane 9 is cured, the membrane mold is removed. Thereby, the opening 9d of the holding member 11 is closed and the membrane 9 held by the holding member 11 is formed.

Further, the diaphragm 5 and the restriction passage member 8 are molded in two colors, and the diaphragm 5 and the restriction passage member 8 are integrally molded. As a two-color molding method, a known two-color molding method can be used. For example, the restriction passage member 8 is formed by pouring a hard thermoplastic resin into a mold (restriction passage mold) (not shown) for forming the restriction passage member 8. Thereafter, the restriction passage mold is removed after the restriction passage member 8 is cured. Next, the molded restriction passage member 8 is placed at a predetermined position in a mold (diaphragm mold) (not shown) for molding the diaphragm 5. Then, the diaphragm 5 is molded by pouring a thermoplastic elastomer into the diaphragm mold. At this time, the thermoplastic elastomer is molded without performing the adhesive base treatment or the application of the adhesive to the restriction passage member 8 previously molded. Further, the diaphragm 5 made of a thermoplastic elastomer is molded in a shorter time than the case of vulcanization molding of a rubber material. Thereafter, the diaphragm mold is removed after the diaphragm 5 is cured. As a result, the lower surface joint portion 52 of the diaphragm 5 is directly joined to the lower surface of the restriction passage member 8, and the inner peripheral surface joint portion 53 of the diaphragm 5 is directly joined to the inner peripheral surface of the restriction passage member 8. Diaphragm 5 is molded integrally with 8.

It is also possible to mold the diaphragm 5 first and then mold the restriction passage member 8. That is, first, a thermoplastic elastomer is poured into a diaphragm mold to mold the diaphragm 5, and after the diaphragm 5 is cured, the diaphragm mold is removed. Next, the molded diaphragm 5 is arranged at a predetermined position in the restriction passage mold, and the restriction passage member 8 is formed by pouring a hard thermoplastic resin into the restriction passage mold. As a result, the lower surface joint portion 52 of the diaphragm 5 is directly joined to the lower surface of the restriction passage member 8, and the inner peripheral surface joint portion 53 of the diaphragm 5 is directly joined to the inner peripheral surface of the restriction passage member 8. Diaphragm 5 is molded integrally with 8.

At this time, when the base polymer of the rigid thermoplastic resin that forms the restriction passage member 8 and the base polymer of the thermoplastic elastomer that forms the diaphragm 5 are polymers having an affinity for each other, the restriction passage member 8 and the diaphragm As a result of the two-color molding, the base polymers of the two are bonded together in a molten state, and the adhesiveness at the boundary surface between the restriction passage member 8 and the diaphragm 5 is improved.

  Subsequently, the holding member 11 to which the membrane 9 is joined is assembled to the restriction passage member 8 to which the diaphragm 5 is joined. More specifically, the cylindrical portion 11 b of the holding member 11 is fitted into the restriction passage member 8 from the upper side of the restriction passage member 8. Then, the flange portion 11 c of the holding member 11 is brought into contact with the upper surface of the restriction passage member 8. Thereby, the holding member 11 is fitted inside the restriction passage member 8, and the partition member 7 including the restriction passage member 8, the holding member 11, and the membrane 9 is created.

Next, a process of assembling the partition member 7 to which the diaphragm 5 is joined to the vibration isolator main body 12 is performed.
More specifically, the partition member 7 is fitted into the outer cylinder 3 from the lower side of the outer cylinder 3. Then, the upper surface of the partition member 7 (the flange portion 11 c of the holding member 11) is brought into contact with the lower surface of the step rubber 34 of the outer cylinder 3. Thereafter, the lower end portion of the outer cylinder 3 (small diameter portion 30) is bent radially inward to form a crimping portion 35, and the lower end portion of the outer cylinder 3 is caulked and fixed to the partition member 7 (restriction passage member 8). Thereby, the partition member 7 is clamped between the crimping part 35 of the outer cylinder 3, and the aperture | diaphragm | squeeze part 32 (step rubber | gum 34). At this time, the restriction passage member 8 made of a hard thermoplastic resin has a sufficient hardness, so that the restriction passage member 8 is not elastically deformed when the caulking portion 35 is formed. In addition, since the diaphragm 5 is joined to the restriction passage member 8, the diaphragm 5 is installed at the lower end portion of the outer cylinder 3 by assembling the partition member 7 including the restriction passage member 8 to the outer cylinder 3 as described above. Is done. That is, it is not necessary to assemble the diaphragm 5 to the outer cylinder 3.

Next, a step of enclosing the liquid in the liquid chamber 6 is performed.
More specifically, first, the vibration isolator main body 12 to which the partition member 7 is assembled is disposed in a vacuum atmosphere, and a liquid is injected from an inlet (not shown) formed in the outer cylinder 3 or the like, thereby the main liquid chamber 6A. The restriction passage 80 and the auxiliary liquid chamber 6B are filled with liquid, respectively. Thereafter, the above-described inlet is sealed to seal the liquid chamber 6. Thereby, the liquid is sealed in the liquid chamber 6.
As described above, the vibration isolator 1 is manufactured.

  In the vibration isolator 1 described above, the inner cylinder 2 is connected to an engine (not shown) via an engine-side bracket (not shown), and the outer cylinder 3 is connected to a vehicle body (not shown) via a vehicle-side bracket (not shown). By doing so, it is interposed between the engine and the vehicle body.

  Next, the operation of the vibration isolator 1 having the above configuration will be described.

  When the idling vibration of the engine described above occurs, the vibration is transmitted to the inner cylinder 2 of the vibration isolator 1 through the engine side bracket. In this case, in the vibration isolator 1, the liquid does not flow from the main liquid chamber 6A to the sub liquid chamber 6B through the restriction passage 80, and the internal pressure of the main liquid chamber 6A increases. At this time, the membrane 9 is deformed according to the increase in the internal pressure of the main liquid chamber 6A, that is, according to the internal pressure difference between the main liquid chamber 6A and the sub liquid chamber 6B. Thereby, the pressure rise in the main liquid chamber 6A is alleviated, the increase in the dynamic spring constant accompanying the pressure rise in the main liquid chamber 6A is suppressed, and the vibration transmitted to the vehicle body is reduced.

  Further, when the vibration input from the above-described engine has a relatively low frequency such as shake vibration, the liquid flows through the restriction passage 80 between the main liquid chamber 6A and the sub liquid chamber 6B. At this time, liquid column resonance occurs in the liquid, and vibration energy is attenuated by pressure fluctuation, viscous resistance, and the like. As a result, vibration input from the engine is attenuated. At this time, since the diaphragm 5 made of the thermoplastic elastomer has sufficient flexibility (softness), the diaphragm 5 is elastically deformed as the liquid flows between the main liquid chamber 6A and the sub liquid chamber 6B, and the sub liquid chamber 6B The internal volume of the liquid chamber 6B expands and contracts. That is, for example, when the liquid moves from the main liquid chamber 6A to the sub liquid chamber 6B through the restriction passage 80, the diaphragm 5 is deformed downward and the internal volume of the sub liquid chamber 6B is expanded. As a result, even when a large vibration is input, an increase in the internal pressure of the sub liquid chamber 6B is suppressed, and the liquid flows through the restriction passage 80, thereby exhibiting a vibration damping effect.

  According to the vibration isolator 1 having the above-described configuration, the diaphragm 5 is joined to the restriction passage member 8, and the lower end of the outer cylinder 3 is assembled by assembling the partition member 7 including the restriction passage member 8 to the outer cylinder 3. Since the diaphragm 5 is installed in the portion, the process of assembling the diaphragm 5 to the outer cylinder 3 is omitted, and the assembly man-hour of the vibration isolator 1 can be reduced. Further, when the diaphragm 5 made of thermoplastic elastomer and the restricted passage member 8 made of hard thermoplastic resin are joined, it is possible to omit the adhesion base treatment and the application of the adhesive. The diaphragm 5 made of a thermoplastic elastomer can be molded in a shorter time than when a rubber material is vulcanized. As described above, the productivity of the vibration isolator 1 can be improved.

  In addition, the restriction passage member 8 made of a hard thermoplastic resin has sufficient hardness and is not deformed when the partition member 7 is assembled to the outer cylinder 3. Caulking can be fixed, and the diaphragm 5 can be assembled to the outer cylinder 3 without using a fastener or the like, and the number of parts can be reduced.

  Further, by forming the restriction passage member 8 and the diaphragm 5 in two colors, the restriction passage member 8 and the diaphragm 5 are joined, so that the productivity can be further improved. Also, by making the base polymer of the rigid thermoplastic resin forming the restricted passage member 8 and the base polymer of the thermoplastic elastomer forming the diaphragm 5 into a polymer having affinity for each other, both base polymers are melted together. Since the adhesiveness between the restricting passage member 8 and the diaphragm 5 is improved by coupling in a state, the restricting passage member 8 and the diaphragm 5 can be reliably connected, and the diaphragm 5 is prevented from being detached from the restricting passage member 8. can do.

  Moreover, since the weather resistance and heat resistance of the diaphragm 5 are improved by using EPDM as the elastomer component of the thermoplastic elastomer that forms the diaphragm 5, the deterioration of the diaphragm 5 can be suppressed.

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, in the above-described embodiment, an engine (not shown) that is a vibration generation source is connected to the inner cylinder 2 via an engine side bracket, and a vehicle body (not shown) that is a vibration receiving portion is connected to the outer cylinder 3 on the vehicle body side. Although it is connected via a bracket, the present invention can be applied even if the vibration receiving portion is connected to the inner cylinder 2 (second mounting member) and the vibration generating source is connected to the outer cylinder 3 (first mounting member). Good.

In the above-described embodiment, the compression type vibration isolator 1 is installed and installed so that the main liquid chamber 6A is positioned on the upper side in the vertical direction and the sub liquid chamber 6B is positioned on the lower side in the vertical direction. Although described, the present invention is a suspension type vibration isolator that is mounted and installed so that the main liquid chamber 6A is positioned on the lower side in the vertical direction and the sub liquid chamber 6B is positioned on the upper side in the vertical direction. It is also possible to apply to.

  Moreover, although the above-described embodiment describes the vibration isolator 1 that is applied as an engine mount of a vehicle, the vibration isolator according to the present invention can be applied to other than the engine mount. For example, the vibration isolator according to the present invention can be applied as a mount of a generator mounted on a construction machine, or can be applied as a mount of a machine installed in a factory or the like.

  Further, in the above-described embodiment, the inner cylinder 2 is disposed coaxially with the outer cylinder 3, and a bolt (not shown) is screwed onto the female thread portion 2 a of the inner cylinder 2 so that the engine (not shown) is attached to the inner cylinder 2. Although the configuration is such that the side bracket is attached, the present invention may be configured such that the press-fit portion of the engine-side bracket is press-fitted inside the inner cylinder 2. Further, the inner cylinder 2 extends in a direction perpendicular to the outer cylinder 3, and a bolt of an engine side bracket (not shown) is inserted inside the inner cylinder 2 and mechanically fixed with a nut or the like. Good. Furthermore, the present invention is not limited to the cylindrical second mounting member. For example, the second mounting member may be configured to have a bolt projecting, and may be configured to be mounted on an engine side bracket or the like by the bolt. .

  In the above-described embodiment, the restriction passage member 8 is caulked and fixed to the lower end portion of the outer cylinder 3, but the present invention is not limited to the configuration in which the restriction passage member 8 is caulked and fixed to the outer cylinder 3. For example, the restriction passage member 8 may be fixed to the outer cylinder 3 with a stopper or the like.

  Further, in the above-described embodiment, the diaphragm 5 has a configuration in which the round dish-like film part 51 bulging on the rebound side is stretched inside the cylindrical peripheral wall part 50. The diaphragm 5 is not limited to the above-described configuration. For example, the membrane portion 51 is stretched inside the restriction passage member 8 and the cylindrical peripheral wall portion 52 is omitted. The membrane portion 5 may be bulged to the bounce side, or the diaphragm 5 may be stretched in a relaxed state instead of being round.

  In the above-described embodiment, the partition member 7 is assembled to the vibration isolator body 12 including the inner cylinder 2, the outer cylinder 3, the elastic body 4, etc., and then the liquid chamber 6 is evacuated to inject the liquid. In the present invention, the liquid is filled in the liquid chamber 6 by assembling the partition member 7 to the vibration isolator main body 12 among the liquid filled in the liquid chamber 6. It is also possible to employ a submerged assembly method for filling.

Further, in the above-described embodiment, the base polymer of the hard thermoplastic resin that forms the restriction passage member 8 and the base polymer of the thermoplastic elastomer that forms the diaphragm 5 have an affinity, and the restriction passage member 8 and the diaphragm 5 are compatible. However, it is also possible to use different polymers having no “affinity” between the base polymer of the rigid thermoplastic resin of the restriction passage member 8 and the base polymer of the thermoplastic elastomer of the diaphragm 5. . For example, when the restriction passage member 8 and the diaphragm 5 are molded by insert molding or the like, the restriction passage member 8 and the diaphragm 5 are joined by interposing an adhesive between the restriction passage member 8 and the diaphragm 5. Can do. It is also possible to weld the restriction passage member 8 and the diaphragm 5 by ultrasonic welding, heat welding, laser welding, or the like.

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.

1 Vibration isolator 2 Inner cylinder (second mounting member)
3 Outer cylinder (first mounting member)
4 Elastic body 5 Diaphragm 6 Liquid chamber 6A Main liquid chamber 6B Sub liquid chamber 7 Partition member 8 Restriction passage member 80 Restriction passage

Claims (3)

A cylindrical first mounting member connected to any one of the vibration generating unit and the vibration receiving unit, and a second mounting member connected to the other;
An elastic body for elastically connecting the first mounting member and the second mounting member;
A partition member that divides the liquid chamber in the first mounting member into a main liquid chamber on one side and a sub liquid chamber on the other side having the elastic body as a part of a wall surface;
A diaphragm that forms part of the wall surface of the auxiliary liquid chamber, and
In a liquid-filled vibration isolator in which a restriction passage that connects the main liquid chamber and the sub liquid chamber is formed,
The partition member includes a restriction passage member that is fitted inside the first attachment member and has the restriction passage formed therein.
The restriction passage member is formed of a hard thermoplastic resin,
The diaphragm is formed of a thermoplastic elastomer, and an outer edge portion thereof is joined to the restriction passage member. The vibration isolator according to claim 1, wherein
The base polymer of the rigid thermoplastic resin that forms the restriction passage member and the base polymer of the thermoplastic elastomer that forms the diaphragm have an affinity to bind to each other in a molten state by two-color molding,
The vibration isolator is characterized in that the restriction passage member and the diaphragm are molded in two colors. The vibration isolator according to claim 1 or 2,
An anti-vibration device characterized in that ethylene-propylene-diene rubber is used as an elastomer component of the thermoplastic elastomer forming the diaphragm.

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