JP4236646B2 - Fluid filled vibration isolator - Google Patents

Description

  The present invention relates to a fluid-filled vibration isolator that is mainly used for vibration-proof support of an automobile engine or the like.

  A fluid-filled vibration isolator used for supporting a vibration body such as a conventional automobile engine includes a first mounting bracket attached to a vibration generator side such as an engine and a cylinder attached and fixed to a support side such as a body frame. And a second mounting bracket in a shape are coupled via a vibration-proof base made of a rubber material. By disposing the diaphragm on the lower side of the second mounting bracket so as to face the vibration isolating base, a fluid sealing chamber is formed between the vibration isolating base and the diaphragm, and this fluid sealing chamber is separated by the partitioning means. It is configured to be divided into two chambers on the side and the diaphragm side, and the two chambers communicate with each other through an orifice (see, for example, Patent Document 1).

The partition means includes an elastic partition membrane as a valve member that reciprocates and a pair of upper and lower first restricting members (partition members) and second restricting members (orifice members) that restrict the movement of the elastic partition membrane. Is known. The vibration isolator having such an elastic partition film allows fluid to flow between the two chambers through the orifice under a large-amplitude vibration having a low frequency such as a vibration caused by unevenness of a road surface when the vehicle is running. Demonstrates vibration damping function. On the other hand, the orifice does not function under a high-amplitude vibration having a high frequency such as vibration caused by the engine speed, and exhibits a vibration damping function by reciprocating deformation of the elastic partition membrane.
JP 2003-294080 A

  In recent years, global efforts have been implemented to reduce the amount of carbon dioxide emission and to protect the environment. In order to protect such a global environment, it is necessary to spread low-emission vehicles with low carbon dioxide emissions, and improving fuel efficiency associated with weight reduction of automobiles is one of the biggest issues. In order to reduce weight, automobile parts are also changing from conventional iron materials to synthetic resins.

  The fluid-filled vibration isolator is not an exception, and it is desirable to adopt a part made of a lightweight synthetic resin as much as possible. The second restricting member arranged on the upper side described in Patent Document 1 is formed from a synthetic resin material, and a fluid in which ethylene glycol and water are mixed is sealed in the fluid sealing chamber. For this reason, the second regulating member made of synthetic resin absorbs the liquid and swells after long-term use.

  Since the outer peripheral portion of the second restricting member is fixed to the first restricting member side, the second restricting member is in a deformed state that swells upward so that the central portion is separated from the first restricting member side. As a result, a gap greater than an allowable value is generated between the second restricting member and the elastic partition film. For example, in the case of large-amplitude vibration, liquid may inadvertently leak from the gap, thereby reducing the vibration damping function. There is a fear. In addition, due to the reciprocating deformation of the elastic partition film, abnormal noise such as a collision sound between the partition means and the elastic partition film is generated.

  According to the present invention, the first restricting member and the second restricting member of the partitioning unit are formed of a synthetic resin material, thereby reducing the weight and preventing the synthetic resin restricting member from being swollen and deformed by a fluid. The task is to do.

  In order to solve the above problems, the present invention has the following configuration.

A first attachment member attached to one fixed side, a second attachment member attached to the other fixed side, and a vibration isolating base made of a rubber material interposed between these attachment members to couple the two attachment members; A diaphragm attached to the second mounting member so as to face the vibration isolating base so as to form a fluid sealing chamber, a first chamber on the vibration isolating base side, and a second chamber on the diaphragm side Partitioning means, and the partitioning means includes: the elastic partition membrane; a first regulating member that regulates a displacement amount of the elastic partition membrane from one membrane surface of the elastic partition membrane; and an outer side of the other membrane surface. A fluid-filled type vibration damping device configured to communicate with the first chamber and the second chamber via an orifice, the second regulating member regulating from the side; regulating member is molded from a synthetic resin material, the 1 The regulating member is integrally provided with a thin regulating portion on the inner peripheral side of the cylindrical support portion, and a flange portion projects radially outward from the outer periphery of the support portion. A concave orifice opening that constitutes a part of the orifice is formed in a part of the circumferential direction, and the flange part is welded along the circumferential direction of the flange part on the surface of the flange part on the second regulating member side. A joint groove is provided, and the welding fitting groove is provided over the entire circumference except for the orifice opening of the flange portion, and both ends of the welding fitting groove are not communicated with the orifice opening, An orifice opening that constitutes a part of the orifice is formed in the outer peripheral portion of the second restricting member, and is welded to the welding fitting groove of the first restricting member on the first restricting member side of the outer peripheral portion. The long welding ridges to be fitted project along the welding fitting grooves. It is, wherein the restricting portion and the second regulating member, a plurality of through holes are respectively provided, said the central side than the fixing portion of the outer peripheral portion of the first regulating member and the second regulating member, fitting irregularities each other A concave-convex fitting portion is provided, and the concave-convex fitting portion includes a welding convex portion and a welding concave portion, and the welding convex portion and the welding concave portion are fitted so as not to be relatively rotatable, and the first regulating member and By relative positioning in the circumferential direction of the second restricting member, the opening for orifice and each through hole are made to correspond to each other, and the concave and convex fitting portion is inserted into the elastic partition film so as not to be relatively rotatable. The fitting hole is provided and the elastic partition membrane is positioned in the circumferential direction and the diameter direction .

In the present invention, since the first restricting member and the second restricting member are formed from a synthetic resin material, the weight can be reduced. Moreover, although the first restricting member and the second restricting member are made of synthetic resin, the first restricting member and the second restricting member are fitted to each other on the center side of the fixing portion of the outer peripheral portion of the first restricting member and the second restricting member. Since the concavity and convexity fitting portions to be joined are respectively provided and fixed, it is possible to prevent the center side of the first restricting member and the second restricting member from being swollen and deformed by the fluid in the fluid filled chamber.
In addition, by combining arbitrary members of the first restricting member, the second restricting member, and the elastic partition film, relative alignment in the circumferential direction is possible.

  Moreover, it is preferable that the outer periphery shape of the said uneven | corrugated fitting part and the shape of the fitting hole of the said elastic partition film are formed in non-circle.

  The present invention can prevent deformation due to swelling of the regulating member of the partition means by the fluid, can prevent the deterioration of the vibration isolation performance and the generation of noise, and can contribute to weight reduction.

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

  FIG. 1 is a longitudinal sectional view of a fluid filled type vibration damping device according to an embodiment of the present invention. The vibration isolator 1 includes a vibration isolator body 2 and partition means 5 that partitions the fluid sealing chamber 3 provided in the vibration isolator body 2 into a first chamber 3a and a second chamber 3b. .

  The anti-vibration device body 2 includes a first mounting member 10 as a first mounting member that is mounted on the side of a vibration generator such as an engine, and a cylindrical second member that is mounted and fixed on a support side of the body frame or the like. 2 is mainly composed of an anti-vibration base 12 made of a rubber material that couples the first mounting bracket 10 and the second mounting bracket 11.

  The second mounting bracket 11 includes a cylindrical bracket 14 and a bottom bracket 15 fastened to the lower end 14a thereof by caulking means, and mounting bolts 16 project from the bottom bracket 15.

  The first mounting bracket 10 is a plate-like member disposed above the axial center portion of the second mounting bracket 11 with a predetermined interval, and a mounting bolt 17 projects upward from the center thereof. Yes.

  The anti-vibration base 12 has a substantially frustoconical outer shape, the first mounting bracket 10 is fixed to the upper surface thereof by vulcanization forming means, and the cylindrical mounting bracket 14 of the second mounting bracket 11 is tapered on the outer periphery of the lower end. The upper end portion 14b having an enlarged diameter is fixed by vulcanization. On the inner wall surface of the second mounting bracket 11, a thin film rubber portion 12 a extending from the antivibration base 12 in a thin film shape is provided.

  A diaphragm 18 made of a rubber film is attached to the lower side of the second mounting bracket 11 so as to face the vibration-proof base 12. The diaphragm 18 includes a ring-shaped reinforcing metal fitting 19 on the outer peripheral portion, and the reinforcing metal fitting 19 is attached to the second attachment metal fitting 11 by being caulked and fixed to a caulking portion between the cylindrical metal fitting 14 and the bottom metal fitting 15. .

  Inside the second mounting bracket 11 and between the diaphragm 18 and the vibration isolating base 12, the sealed fluid enclosure 3 is formed, and a liquid (as a fluid (in the fluid enclosure 3) ( For example, a liquid in which ethylene glycol and water are mixed is enclosed. The partition means 5 is fixed to the inner periphery of the second mounting bracket 11 so as to partition the fluid sealing chamber 3 into a first chamber 3a on the vibration-proof base side and a second chamber 3b on the diaphragm side. Yes. The first chamber 3 a and the second chamber 3 b are communicated by an orifice 6 formed between the second mounting bracket 11 and the partitioning means 5.

  As shown in FIGS. 2 to 6, the partition means 5 regulates a rubber disk-like elastic partition membrane 20 as a valve member and one (lower) membrane surface of the elastic partition membrane 20 from the lower outer side. And a second regulating member 52 that regulates the other film surface from above and outside.

The first restricting member 30 is formed of synthetic resin, and a thin restricting portion 34 is integrally provided on the inner peripheral side of a cylindrical support portion 33. On the outer periphery of the support portion 33, a flange portion 36 protrudes radially outward. As shown in FIG. 5, a portion of the flange portion 36 in the circumferential direction has an orifice 6 on the second mounting bracket 11 side. A concave orifice opening 37 constituting a part of the opening is formed. On the upper surface of the flange portion 36 (the surface of the second regulating member 52 side), the welding groove 39 is provided along the circumferential direction of the flange portion 36. The welding fitting groove 39 is provided continuously over substantially the entire circumference excluding the orifice opening 37 of the flange portion 36, and has a substantially C shape in plan view. Note that both ends of the welding fitting groove 39 do not communicate with the orifice opening 37. Moreover, the welding fitting groove | channel 39 does not necessarily need to be continuous, and may be intermittent.

  The restricting part 34 includes an annular part 40, a central restricting part 41 located at the inner center of the annular part 40, a radial first rib 43 connecting the support part 33 and the annular part 40, and an annular part. 40 and a radial second rib 44 connecting the central restricting portion 41. A plurality of through holes 45 are provided in the circumferential direction by the support portion 33, the annular portion 40 and the first rib 43. A plurality of through holes 46 are provided in the circumferential direction by the annular portion 40, the center restricting portion 41, and the second rib 44.

  On the upper surface of the first restricting member 30, an accommodation recess 48 in which the elastic partition film 20 is accommodated is formed as shown in FIG. The accommodating recess 48 is provided over the support portion 33 with the central restricting portion 41 as the center, and the central restricting portion 41 has a fitting fixing portion 49 that forms the inner peripheral surface of the accommodating recess 48 at the central portion. is doing. The outer peripheral shape of the fitting fixing portion 49 is formed in a square shape (rectangular shape) in plan view as a non-circular shape. In addition, a welding concave portion 50 having a square shape in plan view is formed on the upper surface of the fitting fixing portion 49.

  A fixing member 32 formed by pressing an annular metal plate is fixed to the outer peripheral portion of the support portion 33 by insert molding. The outer peripheral edge portion of the fixing member 32 is connected to the cylindrical metal fitting 14 and the bottom metal fitting 18. The partition means 5 is attached to the second mounting bracket 11 by being caulked and fixed to the caulking portion. The fixing member 32 is formed with a through hole 32a that communicates the first chamber 3a and the second chamber 3b.

  As shown in FIGS. 2, 3, and 6 (a), the second restricting member 52 is formed into a disk shape from a synthetic resin material, and has a diameter substantially equal to that of the flange portion 36 of the first restricting member 30. An annular outer peripheral portion 53, an annular portion 54, a central restricting portion 55, a radial first rib 56 connecting the outer peripheral portion 53 and the annular annular portion 54, and the annular portion 54 and the central restricting portion 55 are connected. And second radial ribs 57. A plurality of through holes 59 are constituted by the outer peripheral portion 53, the annular portion 54 and the first rib 56. Further, the annular portion 54, the center restricting portion 55, and the second rib 57 constitute a plurality of through holes 60.

  In the outer peripheral portion 53, an orifice opening 61 that forms a part of the orifice 6 on the second mounting bracket 11 side is formed. Further, on the back surface of the outer peripheral portion 53 (on the side of the first regulating member 30), a long welding projection 64 that is welded and fitted into the welding fitting groove 39 of the first regulating member 30 is welded and fitted. A protrusion is provided along the groove 39. The welding ridge 64 is provided continuously or intermittently according to the welding fitting groove 39.

  Further, on the back surface of the center restricting portion 55, a welding convex portion 65 that is welded and fitted into the welding concave portion 50 of the first restricting member 30 is projected. The base of the welding convex portion 65 has a function (guide function) for guiding when fitting into the welding concave portion 50, and relative positioning in the relative rotational direction and the diametric direction of the second restricting member 52 with respect to the first restricting member 30. A square shoulder 65a having a function (positioning function) is provided. In addition, the uneven | corrugated fitting part is comprised by the welding convex part 65 and the fitting fixing | fixed part 49. FIG.

  As shown in FIGS. 2 to 4 and FIG. 6B, the elastic partition film 20 is formed in a flat plate shape from a synthetic resin, and has a fitting fixing portion 49 of the central regulating portion 41 at the center thereof. A rectangular fitting hole 21 is formed to be fitted to be non-rotatable. An annular outer rib 23, a radial rib 24 intersecting with the rib 23, an inner rib 25 surrounding the fitting hole 21, and an intermediate rib 26 are provided on both surfaces of the elastic partition film 20. ing.

  When assembling the partition means 5 having the above-described configuration, first, the elastic partition film 20 is housed in the housing recess 48 of the first restricting member 30.

  At this time, the fitting hole 21 of the elastic partition film 20 is fitted into the fitting fixing portion 49 of the first restricting member 30, and relative positioning in the circumferential direction and the diameter direction is performed. Accordingly, the outer rib 23 of the elastic partition film 20 corresponds to the support portion 33 of the first restricting member 30, and the radial rib 24 corresponds to the first rib 43 and the second rib 44 of the first restricting member 30 as appropriate. The inner rib 25 corresponds to the central restricting portion 41 of the first restricting member 30, and the middle rib 26 corresponds to the annular portion 40 of the first restricting member 30.

  Next, the welding protrusions 64 of the second restricting member 52 are respectively fitted into the welding fitting grooves 39 of the first restricting member 30, and the welding protrusions 65 of the second restricting member 52 are replaced by the first restricting member. It is made to fit in 30 welding recessed parts 50. At this time, since the shoulder 65a of the welding convex portion 65 and the welding concave portion 50 are rectangular, relative positioning in the circumferential direction between the first regulating member 30 and the second regulating member 52 is possible. The welding convex portion 65 can be guided to the welding concave portion 50 and can be securely fitted. By relative positioning of the first restricting member 30 and the second restricting member 52, the orifice openings 37 and 61 and the through holes can be easily associated with each other. The outer ribs 23 of the elastic partition film 20 correspond to the outer peripheral portion 53 of the second restricting member 52, and the radial ribs 24 correspond to the first rib 56 and the second rib 57 of the second restricting member 52, The inner rib 25 corresponds to the central restriction portion 55 of the second restriction member 52, and the middle rib 26 corresponds to the annular portion 54 of the second restriction member 52.

  After positioning the first restricting member 30, the second restricting member 52 and the elastic partition film 20, the welding convex portions 65 and the welding concave portions 50 are fixed by ultrasonic welding, and the welding convex portions 64. Is fixed to the welding fitting groove 39 by ultrasonic welding. As a result, the first restricting member 30 and the second restricting member 52 are integrated in a state in which the elastic partition film 20 is accommodated and the outer peripheral portions and the central portions are fixed to each other.

  The vibration isolator 1 of the present embodiment having the above-described configuration allows the fluid to flow between the two chambers 3a and 3b through the orifice 6 under vibration of a large amplitude with a low frequency (for example, ± 0.3 mm or more). Therefore, the vibration damping function is exhibited. Further, the ribs provided on the elastic partition film 20 abut on the annular portions and the ribs of the first restricting member 30 and the second restricting member 52, so that the first restricting member 30 and the second restricting member 52 are in contact with each other. Fluid leakage between the through holes is prevented. Therefore, the elastic partition film 20 can be bent for each through hole, and a high loss factor can be obtained.

  On the other hand, the orifice does not function under vibration with a high frequency and a small amplitude (for example, ± 0.1 mm or less), and the elastic partition film 20 is in the through hole portion of the first restricting member 30 and the second restricting member 52. By reciprocatingly deforming, the fluid pressure in the first fluid chamber is absorbed and the vibration is attenuated.

  Further, when the fluid-filled vibration isolator is used for a long period of time, the first restricting member 30 and the second restricting member 52 may swell with liquid. In such a case, the thin second regulating member 52 tends to be deformed in the diametrical direction, but the second regulating member 52 and the first regulating member 30 are fixed to each other at the center, so the second regulating member It can prevent that the center part of 52 raises and deform | transforms. As a result, the gap between the first restricting member 30 and the second restricting member 52 and the elastic partition film 20 can be prevented from becoming inadvertently large, and the vibration damping function can be maintained over a long period of time. In addition, since the gap between the first restricting member 30 and the second restricting member 52 and the elastic partition film 20 can be prevented from being inadvertently increased, the elastic force between the partition means 5 and the elastic member due to the reciprocating deformation of the elastic partition film 20 is reduced. Occurrence of abnormal noise such as collision noise with the partition film 20 can also be prevented.

  Moreover, in the vibration isolator 1 of the present embodiment, the first restricting member 30 and the second restricting member 52 are made of synthetic resin, so that the overall weight can be reduced compared to a metallic one.

  The present invention is not limited to the embodiment described above. For example, the uneven fitting portion in the central restricting portion of the first restricting member 30 and the second restricting member 52 may be provided with the weld convex portion 65 on the first restricting member 30 and the weld concave portion 50 on the second restricting member 52. Is possible.

  Further, it is also possible to provide the welding protrusion 64 on the outer periphery of the first restricting member 30 and provide the welding fitting groove 39 on the outer periphery of the second restricting member 52.

  The adhering positions of the first restricting member 30 and the second restricting member 52 are not limited to the central portions of the first restricting member 30 and the second restricting member 52. Arbitrary parts should just adhere. Further, the fixing location between the central sides is not limited to one location and may be a plurality of locations.

  The positioning means for positioning the first restricting member and the second restricting member in the circumferential direction can also be constituted by the welding protrusion 64 and the welding fitting groove 39.

  In the above-described embodiment, the configuration in which the first regulating member 30, the second regulating member 52, and the elastic partition film 20 are positioned at the same time has been exemplified. However, any two may be positioned. For example, when positioning the 1st control member 30 and the 2nd control member 52, positioning with these and the elastic partition film | membrane 20 is unnecessary. In such a case, the elastic partition film 20 may be configured to rotate relative to the first restricting member 30 and the second restricting member 52. It is also possible to position either the first regulating member 30 or the second regulating member 52 and the elastic partition film 20.

  The fitting shape of the welding convex portion 65 and the welding concave portion 50 may be a polygonal shape (non-circular) such as a triangular shape or a pentagon other than the rectangular shape. Further, the shape of the fitting hole 21 of the elastic partition film 20 and the fitting fixing portion 49 of the first regulating member 30 may be a polygonal shape (non-circular) such as a triangular shape or a pentagon other than the rectangular shape.

  When the central sides of the first restricting member 30 and the second restricting member 52 are fixed to each other at a plurality of locations, the fitting holes 21 of the elastic partition film 20 are provided with the uneven fitting of the first restricting member 30 and the second restricting member 52. A plurality are provided corresponding to the number of joints. Therefore, even if the shape of the fitting hole 21 and the fitting fixing portion 49 is circular, the elastic partition film 20 and the first regulating member 30 can be positioned. At the same time, the first restricting member 30 and the second restricting member 52 can be positioned.

  It should be noted that the fact that the concave-convex fitting portion is inserted into the fitting hole of the elastic partition film 20 so as not to be relatively rotatable is that at least one of the first restriction member 30 and the second restriction member 52 is elastic partition film 20. Means that the concave-convex fitting portion is inserted into the fitting hole of the elastic partition film 20 so as not to relatively rotate.

It is a longitudinal cross-sectional view of the fluid enclosure type vibration isolator which concerns on one Embodiment of this invention. It is sectional drawing which shows the partition means of the vibration isolator. It is a disassembled sectional view of the partition means of the vibration isolator. It is a top view of the partition means of the vibration isolator. It is a top view of the 1st control member. (A) is a top view of a 2nd control member, (b) is a top view of an elastic partition film.

Explanation of symbols

3 Fluid Enclosure Chamber 3a First Chamber 3b Second Chamber 5 Partitioning Unit 6 Orifice 10 First Mounting Member (First Mounting Bracket)
11 Second mounting member (second mounting bracket)
12 Antivibration Base 18 Diaphragm 20 Elastic Partition Film 21 Fitting Hole 30 First Restricting Member 39 Welding Fitting Groove 41 Central Restricting Part 49 Fitting Fixing Part 50 Welding Concave 52 Second Regulating Member 55 Central Regulating Part 64 Welding Convex 65 welding convex part 65a shoulder part

Claims (2)

A first attachment member attached to one fixed side, a second attachment member attached to the other fixed side, and a vibration isolating base made of a rubber material interposed between these attachment members to couple the two attachment members; A diaphragm attached to the second mounting member so as to face the vibration isolating base so as to form a fluid sealing chamber, a first chamber on the vibration isolating base side, and a second chamber on the diaphragm side Partitioning means, and the partitioning means includes: the elastic partition membrane; a first regulating member that regulates a displacement amount of the elastic partition membrane from one membrane surface of the elastic partition membrane; and an outer side of the other membrane surface. A fluid-filled vibration isolator configured to communicate with the first chamber and the second chamber via an orifice, the second regulating member regulating from the side,
The first restricting member and the second restricting member are molded from a synthetic resin material,
The first restricting member is integrally provided with a thin restricting portion on an inner peripheral side of a cylindrical support portion, and a flange portion projects radially outward from the outer periphery of the support portion. A concave orifice opening constituting a part of the orifice is formed in a part of the circumferential direction of the part, and the surface of the flange part on the second regulating member side is along the circumferential direction of the flange part. A welding fitting groove is provided, and the welding fitting groove is provided over the entire circumference except for the orifice opening of the flange portion, so that both ends of the welding fitting groove do not communicate with the orifice opening. And
An orifice opening that constitutes a part of the orifice is formed in the outer peripheral portion of the second restricting member, and is welded to the welding fitting groove of the first restricting member on the first restricting member side of the outer peripheral portion. The long welding ridges to be fitted are projected along the welding fitting groove,
The restricting portion and the second restricting member are each provided with a plurality of through holes,
A concave / convex fitting portion for fitting the concave and convex portions to each other is provided on the center side of the first restricting member and the fixing portion of the outer peripheral portion of the second restricting member. The welding convex portion and the welding concave portion are fitted so as not to be relatively rotatable, and relative positioning in the circumferential direction of the first restricting member and the second restricting member is performed, so that the orifice openings and the respective openings Match the through holes,
The elastic partition membrane is provided with a fitting hole through which the concave-convex fitting portion is inserted so as not to be relatively rotatable , and the elastic partition membrane is positioned in the circumferential direction and the diametrical direction. Type vibration isolator. Before Ki凹 shape of the fitting hole of the outer shape and the elastic partition membrane of the convex fitting portion, a fluid-filled vibration damping device according to claim 1, which is formed in non-circular.

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