JP2003014033A - Fluid-sealed vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid-sealed vibration isolating device of novel structure which can realize durability to a high degree in a cylindrical flexible film while sufficiently ensuring a selective freedom degree of material in a main rubber elastic unit and the cylindrical flexible film. SOLUTION: A stopper mechanism is constituted by arranging a heat seal tubular unit 70 externally inserted in an outer side of a cylindrical flexible film 44 arranged so as to cover an external peripheral surface of the main rubber elastic unit 16 and well utilizing the heat seal tubular unit 70 thus arranged to limit relative displacement between first/second mounting members 12, 14.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fluid filled type vibration damping device capable of exhibiting a vibration damping effect based on a flow action of an incompressible fluid sealed inside, for example, as an engine mount or body mount for an automobile. The present invention relates to a fluid filled type vibration damping device that can be suitably adopted.

[0002]

2. Description of the Related Art Conventionally, as a vibration-proof connecting body or a vibration-proof supporting body interposed between members constituting a vibration transmission system, a first mounting member attached to one member to be vibration-proof connected, The second mounting bracket, which is attached to the other member that is vibration-proof connected, is elastically connected by the main rubber elastic body, and the main rubber elastic body partially constitutes the wall part to enclose the incompressible fluid. To form a variable volume equilibrium chamber in which an incompressible fluid is enclosed by a pressure receiving chamber and a flexible membrane that is easily deformable, and the pressure receiving chamber and the equilibrium chamber are communicated with each other through an orifice passage. Thus, the vibration damping effect exerted based on the flow action such as the resonance action of the fluid that is caused to flow in the orifice passage against the input vibration between the first mounting member and the second mounting member is utilized. A fluid-filled anti-vibration device is known. .

Further, as a kind of such a fluid filled type vibration damping device, a cylindrical portion is provided on the second mounting member, and the first mounting member is arranged separately on the one axial opening side of the cylindrical member. At the same time, the outer peripheral edge of the main rubber elastic body is fixed to the tubular part,
In addition, by fixing the first mounting member on the central axis of the main body rubber elastic body, the main body rubber elastic body closes one axial opening of the cylindrical portion in a fluid-tight manner, while The outer peripheral surface of the main body rubber elastic body is separated from the second mounting member by a tapered outer peripheral surface of the main body rubber elastic body so as to cover the outer peripheral surface of the main body rubber elastic body. It is known that a part of the wall portion on the outer peripheral side is formed of a tubular flexible film to form an equilibrium chamber in which an incompressible fluid is enclosed. For example, Japanese Patent Laid-Open No. 8-
291844 and Japanese Patent Application Laid-Open No. 9-257090,
JP-A-10-38016, JP-A-2001-595
That is what is disclosed in Japanese Patent No. 40, etc.

In such a fluid filled type vibration damping device, when the vibration in the substantially central axis direction is inputted between the first mounting member and the second mounting member, the elastic deformation of the main rubber elastic body is accompanied. The pressure fluctuation in the pressure receiving chamber causes the fluid flow through the orifice passage based on the relative pressure fluctuation between the equilibrium chamber and the pressure receiving chamber where the volume change is allowed by the elastic displacement of the tubular flexible membrane. Therefore, the effective vibration damping effect can be obtained based on the flow action such as the resonance action of the fluid.

Moreover, in the fluid filled type vibration damping device having such a structure, the pressure receiving chamber is formed inside while the main rubber elastic body is sandwiched, while the equilibrium chamber is formed on the outer peripheral side. The separation distance between the metal fitting and the second mounting metal fitting in the central axis direction can be suppressed to a small value, and the overall size of the vibration isolator in the central axis direction can be made compact and the elastic center of the vibration isolator can be reduced. There is an advantage that it can be set to a low position from the supporting surface, and its application to, for example, an engine mount for automobiles is under study.

However, in the fluid filled type vibration damping device having such a structure, the thin cylindrical thin film having small strength and large deformation covers the outer peripheral surface of the main rubber elastic body. And because it is arranged in the outermost part,
The durability of such a tubular flexible film is likely to be a problem, and in particular, damage due to interference with other members of the tubular flexible film and deterioration due to the influence of heat from an internal combustion engine or the like become a serious problem. There was a problem that it was easy.

In view of this problem, Japanese Patent Laid-Open No. 10-3
Japanese Patent Publication No. 8016 proposes a structure in which the tubular flexible film is made of a heat-resistant rubber material different from that of the main rubber elastic body to impart a high degree of heat resistance to the tubular flexible film. However, if the tubular flexible film is made of a heat-resistant rubber material, the degree of freedom in selecting the material of the tubular flexible film is greatly limited, and the corrosion resistance against the enclosed fluid, the ozone resistance, and the physical properties are not limited. In some cases, it was difficult to deal with the strength, etc., and the required characteristics were not sufficiently satisfied.

[0008]

The present invention has been made in view of the circumstances as described above, and the problem to be solved is that the degree of freedom in selecting the material of the main rubber elastic body or the tubular flexible film. It is an object of the present invention to provide a fluid-filled type vibration damping device having a novel structure, which is capable of achieving a high degree of durability in a tubular flexible film while sufficiently ensuring the above.

The present invention also provides a stopper mechanism for limiting the relative displacement of the first mounting member and the second mounting member, without the need for a special member. It is also an object to realize a simple structure by making good use of the protection means of the membrane.

[0010]

Aspects of the present invention made to solve such problems will be described below. The constituent elements used in each of the following aspects can be used in any combination as much as possible. Further, the aspects and technical features of the present invention are not limited to those described below, but are described in the entire specification and the drawings, or the invention idea that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on this.

That is, according to the first aspect of the present invention, the first mounting member is arranged so as to be spaced apart from one opening side of the tubular portion of the second mounting member, and the tubular shape of the second mounting member is also provided. A main body rubber elastic body is disposed on the one opening side of the main body, the outer peripheral edge portion of the main body rubber elastic body is fixed to the tubular portion, and the first main body elastic body is provided on the central axis of the main body rubber elastic body. The first mounting member and the second mounting member are elastically connected by the main body rubber elastic body by fixing the mounting member of (1), and one opening of the tubular portion of the second mounting member is fixed. Close the fluid tightly,
A non-compressible fluid is enclosed in the tubular portion of the second mounting member to form a pressure receiving chamber in which a part of the wall portion is formed by the main rubber elastic body, while the main rubber elastic body is The main body is made to protrude outwardly in the axial direction from the second mounting member by a tapered outer peripheral surface, and the tubular flexible film is spaced apart so as to cover the outer peripheral surface of the main body rubber elastic body. An orifice for forming an equilibrium chamber in which a part of the wall portion is formed by the tubular flexible film on the outer peripheral side of the rubber elastic body and in which an incompressible fluid is enclosed, and further, the equilibrium chamber is connected to the pressure receiving chamber. In a fluid filled type vibration damping device having a passage, a heat seal cylinder is externally arranged on the outer peripheral side of the cylindrical flexible film,
While fixing the axial base end portion of the heat seal tube body to the second mounting member, the axial tip end portion of the heat seal tube body is extended inward in the direction perpendicular to the axis for the first attachment. A stopper portion is formed to face the member in the axial direction and / or the axis-perpendicular direction, and the stopper portion is brought into contact with the first mounting member via a cushioning member so as to contact the first mounting member. It is characterized in that the relative displacement amount of the mounting member and the second mounting member is elastically limited.

In the fluid filled type vibration damping device having the structure according to the present embodiment as described above, since the heat seal tubular body is externally arranged on the outer peripheral side of the tubular flexible film, the tubular flexible membrane is flexible. The flexible film is covered by the heat-sealing cylinder over substantially the entire circumference thereof, whereby damage due to interference with other members of the tubular flexible film and radiation heat from the internal combustion engine, etc. A heat seal mechanism that prevents deterioration and the like due to influences can be advantageously configured. Therefore, in the fluid filled type vibration damping device according to the present aspect, a large degree of freedom in selection of the material for forming the main rubber elastic body and the tubular flexible film is ensured, and the durability and durability of the tubular flexible film are improved. Ozone, chemical resistance, heat resistance, etc. can be highly realized.

Further, in the present embodiment, the heat-sealing tubular body arranged so as to cover the tubular flexible film over substantially the entire circumference is skillfully utilized to make good use of the first mounting member and the first mounting member. A stopper mechanism that buffer-limits the relative displacement of the two attachment members is configured together with the heat seal mechanism. Therefore, according to this aspect, in the fluid filled type vibration damping device having the specific structure in which the outer peripheral surface of the main rubber elastic body is provided with the equilibrium chamber, the fluid filled type vibration damping device having both the heat seal mechanism and the stopper mechanism is provided. It can be realized with a simple structure.

Further, when the relative displacement amount of the first mounting member and the second mounting member is limited by the stopper mechanism in this embodiment, one of the first mounting member and the second mounting member in the axial direction or Can limit the relative displacement in both, and in place of or in addition to it, limit the relative displacement in the direction perpendicular to the axis of the first mounting member and the second mounting member. It is also possible. Specifically, for example, in the first mounting member, the U-shaped recess opening to the outer peripheral surface is integrally or fixedly formed, and
By inserting the stopper portion into the recessed portion, the stopper portion is axially opposite to the U-shaped recessed portion and in a direction perpendicular to the axis,
By arranging them to face each other via an appropriate buffer member, a stopper mechanism capable of exhibiting stopper functions in multiple directions can be advantageously realized with a small number of parts and a simple structure.

A second aspect of the present invention is a fluid filled type vibration damping device having the structure according to the first aspect,
A first fixing member is fixed to one end portion of the tubular flexible film in the axial direction, the first fixing member is fixed to the first mounting member, and the shaft is removed from the first mounting member. By extending outward in the right angle direction, the stopper portion of the heat seal tubular body forms an abutting portion with which the stopper portion abuts in the axial direction, while at the other axial end of the tubular flexible membrane. The second fixing member is fixed to the second fixing member, and the second fixing member is arranged along the inner peripheral surface of the axially proximal end portion of the heat-sealing cylinder, and the second mounting member together with the heat-sealing cylinder. It is characterized by being fixed by caulking against. In the fluid filled type vibration damping device having the structure according to the present embodiment,
By making good use of the first fixing member for fixing the tubular flexible film to the first mounting member, the stopper portion can be brought into contact with the first mounting member without increasing the size thereof. The part can be easily formed. Further, in this aspect, since the tubular flexible film is formed as a separate member from the main rubber elastic body, the degree of freedom in selecting the forming material of the main rubber elastic body and the tubular flexible film is different for each. It can be secured more advantageously.

A third aspect of the present invention is a fluid filled type vibration damping device having a structure according to the second aspect,
At the end of the tubular flexible film on the side of the second fixing member, a sealing rubber for preventing water and the like from entering between the second fixing member and the heat-sealing tubular body is provided over the entire circumference. It is characterized by being integrally formed. In the fluid filled type vibration damping device having the structure according to the present embodiment, it is possible to advantageously prevent intrusion of water or the like between the second fixing member and the heat seal cylinder, and thereby, , For example,
In the case where the second fixing member and the heat-sealing cylinder are made of a metal material, the second fixing member and the heat caused by the intrusion of water or the like between the second fixing member and the heat-sealing cylinder. Corrosion of the seal cylinder can be advantageously prevented. Further, in this aspect, it is desirable that the heat-sealing tubular body be provided with a discharge hole at a position close to a sealing portion made of seal rubber, whereby the heat-sealing tubular body penetrates between the heat-sealing tubular body and the tubular flexible membrane. Water or the like can be quickly discharged to the outside of the heat seal cylinder.

A fourth aspect of the present invention is a fluid filled type vibration damping device having a structure according to the second or the third aspect, wherein the tubular portion of the second mounting member is attached to the tubular portion. The second fixing member is externally arranged to form a circumferential passage extending in the circumferential direction between the tubular portion of the second mounting member and the second fixing member, and the pressure receiving chamber is formed through the circumferential passage. The orifice passage is formed by connecting the equilibrium chambers to each other. In the fluid filled type vibration damping device having the structure according to this aspect, since the orifice passage extending in the circumferential direction can be formed in the outer peripheral portion of the fluid filled type vibration damping device, the passage length of the orifice passage can be increased. A large degree of freedom in setting can be secured. Also,
In this aspect, since the orifice passage can be formed by the second mounting member and the second fixing member, it is not necessary to employ a special orifice member for forming the orifice passage, and thereby, The number of components of the fluid filled type vibration damping device can be reduced. Further, in this aspect, since the orifice passage is formed substantially outside the pressure receiving chamber, the degree of freedom in designing the shape of the pressure receiving chamber and the like is increased, and the volume of the pressure receiving chamber can be set large.

Further, in this aspect, the cross-sectional area of the orifice passage can be set and changed by changing the shapes of the tubular portion of the second mounting member and the second fixing member. Can set and change the tuning frequency of the orifice passage. Here, the shape of the tubular portion of the second mounting member is preferably the fifth aspect described below.

That is, a fifth aspect of the present invention is a fluid-filled type vibration damping device having a structure according to the fourth aspect, wherein one opening in the axial direction of the tubular portion of the second mounting member is formed. As a tapered tubular portion that expands outward in the axial direction, the outer peripheral edge portion of the main body rubber elastic body is fixed to the tapered tubular portion, and a cutout window is provided in the tapered tubular portion and the main body is formed. A guide groove extending from the cutout window is formed on the outer peripheral surface of the rubber elastic body, and the orifice passage is connected to the equilibrium chamber through the cutout window and the guide groove.

In this embodiment, the supporting surface of the outer peripheral edge of the main body rubber elastic body by the second mounting member is a tapered cylindrical portion, so that the axial compression load in the main body rubber elastic body is increased. It is possible to obtain a stable linear spring characteristic, and to make the orifice passage compact by making good use of the space formed on the side opposite to the support surface of the main rubber elastic body in the tapered cylindrical portion. It can be formed.

Further, the guide groove in the fifth aspect may be formed so as to extend in the axial direction at the outer peripheral edge of the main rubber elastic body. It can be formed in any shape so as to extend in any direction.

In a sixth aspect of the present invention, in the fluid filled type vibration damping device having the structure according to the fifth aspect, the depth dimension of the guide groove is gradually reduced as the guide groove is separated from the cutout window. The feature is that it has a slope shape. In the fluid filled type vibration damping device having the structure according to the present embodiment, the flow of the fluid flowing through the orifice passage through the guide groove can be made smooth, and the vibration damping effect based on the fluid flowing action can be further improved. It can be effectively obtained.

Further, in the present embodiment, the guide groove extends axially on the outer peripheral surface of the main rubber elastic body and may be formed so as to be inclined in the peripheral direction, whereby the guide groove is guided. The flow direction of the fluid can be made closer to the flow direction of the fluid that is caused to flow in the orifice passage in the circumferential direction, and the length of the guide groove can be set to a larger value, thus making the fluid flow in the orifice passage and the equilibrium chamber , Can be made smoother.

A seventh aspect of the present invention is a fluid filled type vibration damping device having a structure according to the fifth or sixth aspect, wherein the volume of the main rubber elastic body is substantially symmetrical with respect to the central axis. As described above, in the main rubber elastic body, in consideration of the guide groove, a volume adjusting portion including a cutout portion and / or a built-up portion is formed at an appropriate portion around the central axis. . In the fluid filled type vibration damping device having the structure according to the present embodiment, the volume (volume) of the main rubber elastic body can be balanced in the circumferential direction around the central axis. Therefore, it is possible to reduce the influence of the guide groove formed on the main rubber elastic body on the vibration damping characteristics and the supporting characteristics, and the spring of the main rubber elastic body against static load or dynamic load input from the outside. The characteristics can be stabilized, the concentration of stress on the portion where the guide groove is formed can be relaxed, and the durability of the main rubber elastic body can be improved.

As the volume adjusting portion in this aspect, specifically, for example, a cutout portion may be provided in a portion symmetrical to the guide groove with respect to the central axis of the main rubber elastic body,
Alternatively, it can be advantageously realized by providing a built-up portion on the inner peripheral surface side of the guide groove forming portion in the main rubber elastic body.

An eighth aspect of the present invention is the fluid filled type vibration damping device having the structure according to any one of the first to seventh aspects, wherein the other of the tubular portions of the second mounting member is the same. A movable member is provided on the opening side of the movable member to support the movable member so that the movable member can be displaced relative to the second mounting member, and the movable member forms a part of the wall portion of the pressure receiving chamber. It is characterized in that a vibrating means is provided which can positively generate a pressure fluctuation in the pressure receiving chamber by exerting a vibrating force on the movable member. According to this aspect, the active type that can exert an active vibration damping effect that cancels or positively reduces the pressure fluctuation generated in the pressure receiving chamber at the time of vibration input by the vibration force of the movable member Mount becomes feasible.

Particularly, in this aspect, since the orifice passage is formed outside the pressure receiving chamber, it is possible to secure a large volume of the pressure receiving chamber.
Since it is possible to increase the size of the movable member and set a large effective piston area, it is possible to cause a large pressure fluctuation in the pressure receiving chamber even when the vibration amplitude of the movable member is small.

The vibrating means in this mode is as follows.
It is possible to employ an electromagnet type actuator, but in addition, a pneumatic type actuator, an electrostrictive type or a magnetostrictive type actuator, or the like can also be employed.

A ninth aspect of the present invention provides a fluid filled type vibration damping device having a structure according to the eighth aspect,
A partition member for partitioning the pressure receiving chamber in a fluid-tight manner is provided, and a main liquid chamber in which a part of the wall portion is constituted by the main rubber elastic body is provided on both sides sandwiching the partition member, and a wall portion is defined by the movable member. It is characterized by forming a sub liquid chamber which is partially formed, and providing a second orifice passage that connects the main liquid chamber and the sub liquid chamber to each other. According to this aspect, the pressure fluctuation generated in the sub liquid chamber by the vibration of the movable member is efficiently transmitted to the main liquid chamber based on the resonance action of the fluid flowing in the second orifice passage. It becomes possible to
As a result, it becomes possible to more effectively obtain the active vibration damping effect in the tuning frequency range of the second orifice passage.

[0030]

Embodiments of the present invention will now be described in detail with reference to the drawings in order to more specifically clarify the present invention.

First, FIGS. 1 to 4 show an automobile engine mount 10 as a first embodiment of the present invention. In this engine mount 10, a first mounting member 12 as a first mounting member and a second mounting member 14 as a second mounting member are arranged at a distance from each other, and the first mounting member 12 and the first mounting member 12 are separated from each other. The second mounting bracket 14 has a structure in which the main rubber elastic body 16 is elastically connected, and the first mounting bracket 12 is mounted on the power unit of the automobile, while the second mounting bracket 14 is mounted on the body of the automobile. By doing so, the power unit can be supported in a vibration-proof manner with respect to the body. In the following description, the vertical direction means the vertical direction in FIG. 1 in principle.

More specifically, the first mounting member 12 has an inverted frustoconical shape as a whole, and a fitting projection 18 protruding outward in the axial direction is formed at the large-diameter side end thereof. Are integrally formed. In addition, the first mounting member 12 has a screw hole 2 that opens in the protruding tip surface of the fitting protrusion 18 and extends in the axial direction.
0 is formed.

On the other hand, the second mounting member 14 is the upper fitting 22.
And a lower metal fitting 24, and has a substantially bottomed cylindrical shape as a whole. The upper fitting 22 is configured to include a tubular wall portion 26 as a tubular portion, and has a thin-walled cylindrical shape as a whole. Further, a flange portion 28 is integrally formed at the lower end portion of the tubular wall portion 26 of the upper metal member 22 in the axial direction so as to project outward in the radial direction in the shape of an annular plate.
Furthermore, the axial upper end of the tubular wall portion 26 of the upper metal fitting 22 is
The tapered tubular portion 30 is a tapered tubular portion that gradually expands as it goes outward in the axial direction, and a large-diameter side end portion of the tapered tubular portion 30 has an annular ring extending radially outward. A plate-shaped projecting flange portion 32 is integrally formed. On the other hand, the lower metal fitting 24 as a whole has a substantially shallow dish-shaped disc shape, and in the present embodiment, the outer diameter dimension thereof is substantially the same as the outer diameter dimension of the flange portion 28 of the upper metal fitting 22. Has been done. Then, the upper metal fitting 22 and the lower metal fitting 24 are axially overlapped with each other, and the flange portion 28 of the upper metal fitting 22 is directly overlapped with the outer peripheral edge portion of the lower metal fitting 24 in close contact with each other, and the protection described later is performed. By caulking and fixing at the caulking portion 80 of the metal fitting 70, the second mounting metal fitting 14 having a bottomed cylindrical shape as a whole is formed. In addition, the through hole 3 is provided in the central portion of the recess of the lower metal fitting 24.
4 are provided in the through hole 34, and the mounting bolt 3
6 is press-fitted and fixed, and protrudes downward. Furthermore, a seal rubber 35 is filled in the recess of the lower metal fitting 24,
In this state, the head of the mounting bolt 36 is embedded in the seal rubber 35, and the gap between the through hole 34 and the mounting bolt 36 is fluid-tightly closed by the seal rubber 35. As the upper metal piece 22 and the lower metal piece 24, press-molded products are preferably used. Then, the first mounting members 12 are arranged so as to face each other, separated from the opening side of the second mounting members 14, and the first mounting members 1
2 and the second mounting member 14 are elastically connected by a main rubber elastic body 16.

The main rubber elastic body 16 has a truncated cone shape as a whole, and a concave portion 38 that opens to the large diameter side end face is formed at the large diameter side end portion thereof. The main rubber elastic body 16 has the first mounting member 12 embedded and vulcanized and bonded to the small-diameter side end portion in the axially penetrating state, and the large-diameter side end portion outer peripheral surface thereof. The taper tube portion 30 of the upper metal member 22 constituting the second mounting metal member 14 is vulcanized and adhered to the main metal rubber elastic body 1.
6 is formed as a first integral vulcanization molded product 40 including the first mounting member 12 and the upper fitting 22. Further, a seal rubber 42 integrally formed with the main rubber elastic body 16 is adhered to the inner peripheral surface of the cylindrical wall portion 26 of the upper metal fitting 22. The seal rubber 42 is the lower surface of the flange portion 28. Has extended to. As is apparent from the above description, in the present embodiment, the main rubber elastic body 16 projects outward from the second mounting member 14 (upper member 22) in the axial direction with a tapered outer peripheral surface. It has been confused. Further, in the present embodiment, the tapered tubular portion 3 of the upper fitting 22 is provided.
Since the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body 16 is vulcanized and bonded to 0, in the main rubber elastic body 16,
A spring characteristic that is stable and nearly linear with respect to an axial compressive load is exhibited.

Further, a diaphragm 44 as a tubular flexible film is arranged on the outer side in the radial direction of the main rubber elastic body 16. The diaphragm 44 has a thin-walled stepped cylindrical shape as a whole, and has a small diameter portion on the upper side in the axial direction and a large diameter portion on the lower side in the axial direction with a stepped portion formed in an axially intermediate portion interposed therebetween. It is considered to be the diameter part. An upper fixing metal fitting 46 as a first fixing member is vulcanized and bonded to an axially upper end portion having a small diameter, and a lower fixing metal fitting as a second fixing member is provided at a large diameter axial lower end portion. 48 is vulcanized and adhered.

The upper fixing member 46 has an annular plate shape, while the lower fixing member 48 has a large diameter cylindrical shape. In addition, the lower fixing member 48 has an annular inward projection 56 that projects radially inward with respect to the opening on the upper side in the axial direction.
Is integrally formed, the flange-shaped portion 50 that expands outward in the radial direction is integrally formed in the opening on the lower side in the axial direction. Further, the outer peripheral edge portion of the flange-shaped portion 50 is downward in the axial direction. An annular fitting piece 54 is integrally formed by being bent. In addition, such a lower fixing metal fitting 48
As the above, a press molded product is advantageously adopted.

The upper end of the diaphragm 44 in the axial direction is vulcanized and adhered to the outer peripheral edge of the lower surface of the upper fixing member 46, and the diaphragm is attached to the inward projection 56 of the lower fixing member 48. The lower axial end of 44 is adhered by vulcanization, whereby the diaphragm 44 is formed as a second integrally vulcanized molded product 58 having an upper fixing member 46 and a lower fixing member 48. A seal rubber 62 integrally formed with the diaphragm 44 is attached to the lower fixing member 48 so as to surround the inward projection 56. The sealing rubber 62 is attached to the lower fixing member 48.
Spreads over almost the entire inner and outer peripheral surface of the lower fixing bracket 4
8 is formed so as to extend to the lower surface of the flange-shaped portion 50.

Thus, the first integrally vulcanized molded product 40 is inserted in the second integrally vulcanized molded product 58 and assembled, and the diaphragm 44 is attached to the main rubber elastic body 1.
The outer peripheral surface of the main rubber elastic body 16 is arranged so as to cover the entire outer peripheral surface of the main rubber elastic body 16 so as to be separated radially outward. There, the upper fixing member 46 is superposed on the upper surface of the first mounting member 12, and the center hole 6 of the upper fixing member 46 is overlapped.
4 is externally fitted and fixed to the fitting protrusion 18 of the first mounting member 12, and the positioning bolt 66 protrudingly provided on the upper surface of the first mounting member 12 is used for positioning on the upper fixing member 46. Is fitted in the notch hole and positioned in the circumferential direction with respect to the first mounting member 12. Further, the flange-shaped portion 50 of the lower fixing metal fitting 48 is superposed on the upper surface of the flange portion 28 of the upper metal fitting 22, and the fitting piece 54 formed on the outer peripheral edge portion of the flange-shaped metal fitting 50 has an upper surface. The flange portion 28 of the metal fitting 22 and the lower metal fitting 24 are externally fitted. As a result, in the upper metal member 22, an annular groove that is formed so as to extend in the circumferential direction between the facing surfaces of the tapered cylindrical portion 30 and the flange portion 28 and opens to the outer peripheral surface is formed.
It is covered by the lower fixing metal fitting 48, and thus an annular passage 68 as a circumferential passage extending continuously in the circumferential direction is formed between the upper metal fitting 22 and the lower fixing metal fitting 48.

A protective metal fitting 70 as a heat-sealing cylinder is provided outside the diaphragm 44.
The protective fitting 70 is configured to include a cylindrical wall portion 72 and an annular plate-shaped upper bottom portion 74, and as a whole,
It has an inverted cup shape with a large diameter through hole 73 in the center of the upper bottom. The outer peripheral corner portion of the upper bottom portion 74 is a tapered cylindrical portion 76 having a tapered shape in which the diameter gradually decreases from the cylindrical wall portion 72 toward the upper bottom portion 74. Further, a step portion 78 that expands radially outward is integrally formed on the lower opening side peripheral edge portion of the cylindrical wall portion 72, and the outer peripheral edge portion of the step portion 78 is
A cylindrical caulking portion 80 extending downward in the axial direction is integrally formed. In addition, the protective metal fitting 70 is shown in FIG.
As shown in FIG. 3, a cutout portion 82 that spreads at a predetermined width at one location on the circumference is formed so as to extend from the upper bottom portion 74 to the axial center portion of the cylindrical wall portion 72. Through, the bracket 106 described later,
It is arranged so as to be inserted from the side of the protective metal fitting 70, and is superposed and fixed on the upper surface of the first mounting metal fitting 12. In the present embodiment, the circumferential length of the cutout portion 82 is approximately 1 of the circumferential length of the protective fitting 70.
/ 4, which is substantially the same as the diameter dimension of the through hole 73 formed in the upper bottom portion 74. Further, a plurality of through holes 84 are formed in the circumferential direction in the axial center portion of the cylindrical wall portion 72 of the protective fitting 70.

The protective metal fitting 70 is the lower fixing metal fitting 4.
After being externally attached to 8, the cylindrical wall portion 72 is subjected to a drawing process, or by being press-fitted and fixed to the lower fixing metal fitting 48, the seal rubber 62 is pressed against the lower fixing metal fitting 48. In this way, they are assembled in a close contact state. Further, at the lower end portion of the protective metal fitting 70, the step portion 78 is superposed on the flange-shaped portion 50 of the lower fixing metal fitting 48, and the step portion 50 and the fitting piece 54, the flange portion 28 of the upper metal fitting 22, and the lower metal fitting 24. Of the protective metal fitting 70 is fitted onto the outer peripheral edge portion of the protective metal fitting 70, and the caulking portion 80 is caulked to fix the lower end portion of the protective metal fitting 70 in the axial direction to the second mounting metal fitting 14. Further, in this way, the protective metal fitting 7
The lower end portion in the axial direction of 0 is caulked and fixed to the second mounting member 14, so that the outer peripheral edge portion of the lower mounting member 24 and the upper mounting member 22.
The flange portion 28 of the lower fixing metal fitting 48 and the flange portion 50 of the lower fixing metal fitting 48 are sandwiched by the rubber seals 42 and 62 so as to be fluid-tightly overlapped with each other and sandwiched between them, and the inner protruding portion 56 of the lower fixing metal fitting 48 and the upper protrusion. The collar-shaped portion 32 of the metal fitting 22 has the seal rubber 6
Are pressed together via 2 and thereby the annular passage 6
The fluid tightness of 8 is secured.

Further, as described above, since the lower end portion of the protective metal fitting 70 in the axial direction is fixed to the second mounting metal fitting 14,
The protective metal member 70 is disposed at a position spaced apart radially outside the diaphragm 44 so as to cover the diaphragm 44 over the entire circumference. Furthermore, the through hole 84 provided in the protective fitting 70 is located slightly above the seal rubber 62 in the axial direction, and the inner and outer spaces of the protective fitting 70 are communicated with each other by the through hole 84. In addition, as is apparent from the above description, in the present embodiment, the lower fixing metal fitting 48 is disposed along the inner peripheral surface of the lower end portion of the protective metal fitting 70 in the axial direction, and together with the protective metal fitting 70, It is caulked and fixed to the second mounting member 14.

Inside the second mounting member 14, an incompressible fluid is filled between the lower metal member 24 and the opposing surface of the main rubber elastic body 16 so that the main rubber elastic body 16 partially covers the wall. While the pressure receiving chamber 86 is formed, the equilibrium chamber 8 in which the incompressible fluid is enclosed on the outer peripheral side of the main rubber elastic body 16 is formed of the diaphragm 44 as a part of the wall portion.
8 is formed. In short, in the present embodiment, the pressure receiving chamber 86 is formed on the inner peripheral side of the main rubber elastic body 16, and the equilibrium chamber 88 is formed on the outer peripheral side of the main rubber elastic body 16. The pressure receiving chamber 86 and the equilibrium chamber 88
Water, alkylene glycol, polyalkylene glycol, silicone oil or the like can be used as the non-compressible fluid enclosed in the above. In particular, in order to effectively obtain the vibration damping effect based on the resonance action of the fluid described later, Viscosity is 0.1 Pa
A low-viscosity fluid of s or less is preferably adopted.

A communication hole 90 is provided in the cylindrical wall portion 26 of the upper fitting 22, and the pressure receiving chamber 86 is connected to the annular passage 68 through the communication hole 90. Further, the tapered cylindrical portion 30 of the upper fitting 22 has a communication window 9 as a cutout window.
2 is provided, and a slope 94 as a guide groove is formed in the main rubber elastic body 16 at the circumferential position where the communication window 92 is formed. This slope 9
4 is formed so as to extend axially upward from the communication window 92 with respect to the tapered outer peripheral surface of the main rubber elastic body 16, and is opened and communicated with the annular passage 68 through the communication window 92. In this embodiment, the slope 94
Has a depth that gradually decreases with distance from the communication window 92. Further, the annular passage 68 is communicated with the equilibrium chamber 88 by the slope 94 formed on the outer peripheral surface of the main rubber elastic body 16 and the communication window 92 formed on the upper fitting 22. As is clear from this, in the present embodiment, the annular passage 68 forms the orifice passage 96 that extends outside the pressure receiving chamber 86 in the circumferential direction by a length of a little less than one round. The chamber 86 and the equilibrium chamber 88 are in communication with each other.

In this way, the pressure receiving chamber 86 and the equilibrium chamber 8 are
Since 8 are connected to each other by the orifice passage 96, the orifice passage 96 is based on the relative pressure difference caused between the pressure receiving chamber 86 and the equilibrium chamber 88 at the time of vibration input.
A fluid flow through is generated, and as a result, an effective vibration damping effect against the input vibration is exhibited based on the resonance action of the fluid. It should be noted that in the present embodiment, the orifice passage 96 is tuned in passage length, cross-sectional area and the like so as to exert an effective vibration damping effect against low frequency vibration such as engine shake.

Further, a stopper rubber 98 as a cushioning member is fixed to the upper bottom portion 74 of the protective fitting 70 at the peripheral edge portion of the opening of the through hole 73. This stopper rubber 98 is
It has an annular block shape as a whole, and is formed so as to extend in the circumferential direction at the opening peripheral edge portion of the through hole 73 with a substantially constant cross-sectional shape. With the stopper rubber 98, the upper contact rubber portion 100 having a substantially trapezoidal cross section that projects upward from the upper bottom portion 74 and the lower contact rubber that has a substantially inverted trapezoidal cross section that projects downward from the upper bottom portion 74. Part 102
And a radial contact rubber portion 104 projecting radially inward from the upper bottom portion 74, respectively. In the present embodiment, the protruding height of the upper contact rubber portion 100 is set to be larger than the protruding height of the lower contact rubber portion 102, and the upper contact rubber portion 100 and the lower contact rubber portion 100 are formed. 102 are integrally connected by a radial contact rubber portion 104. In the state where the engine mount 10 is not mounted, the lower contact rubber portion 102 is in contact with the upper fixing metal fitting 46 as shown in FIG.

In the engine mount 10 having such a structure, as shown in FIG. 4, the first mounting member 12 is mounted on the engine side via the bracket 106. At the same time, the second mounting member 14 is fixed to the body 108.

The bracket 106 is formed of a rigid, one-piece thick metal fitting, extends from a fixing portion fixed to the power unit, and is fixed to a first mounting fitting 12 of the engine mount 10 at a fixing portion 109. Is equipped with. Further, the fixing portion 109 of the bracket 106 extends with a width dimension slightly smaller than the through hole 73 of the protective metal fitting 70, and is lateral to the cutout portion 82 provided in the protective metal fitting 70 (downward in FIG. 3). ) And is superposed on the upper surface of the first mounting member 12. Further, a bolt insertion hole 112 is formed in the fixed portion 109 of the bracket, and the bracket 114 is inserted into the bolt insertion hole 112 so that the bracket 106 is attached to the first mounting member 1.
The first mounting member 12 is fixed to the engine side via the bracket 106 as a result. On the other hand, the second mounting member 14 is fixed to the body 108 side by mounting bolts 36 fixed to the lower metal member 24 constituting the second mounting member 14.

Further, the bracket 106 extends upward from the first mounting member 12 in the axial direction, and the upper contact rubber portion 10 is provided.
The contact plate portion 1 is projected at a protrusion height larger than 0, and the protrusion tip portion thereof spreads outward in the direction perpendicular to the axis.
10 is integrally formed. And the bracket 106
Is fixed to the first mounting member 12, the contact plate portion 110 faces the upper fixing member 46 fixed to the first mounting member 12 at a predetermined distance in the axial direction. It has been confused. An upper bottom portion 74 of the protective metal fitting 70 having a stopper rubber 98 is disposed between the facing surfaces of the upper fixing metal fitting 46 and the contact plate portion 110. In addition,
The dimension between both axial end surfaces of the upper and lower abutting rubber portions 100 and 102 in the stopper rubber 98 fixed to the upper bottom portion 74 is
The distance between the facing surfaces of the upper fixing member 46 and the contact plate portion 110 is made smaller by a predetermined amount, and the inner diameter dimension of the radial contact rubber portion 104 is the fixing portion 1 of the bracket 106.
It is made larger than the outer diameter dimension of 09 by a predetermined amount.

Here, in the present embodiment, a cutout portion 82 is formed in the cylindrical wall portion 72 and the upper bottom portion 74 of the protective metal fitting 70. In the cutout portion 82, the bracket 1 is formed.
The diaphragm 44 is arranged so as to cover most of the notch 82 so that the diaphragm 44 can be inserted, so that the diaphragm 44 is substantially entirely covered with the protective metal fitting 70, and the heat seal mechanism is provided. Is configured.

Then, as described above, the engine mount 1
When 0 is attached to the automobile, the supporting load of the power unit is input to the main rubber elastic body 16 in the axial direction, and as a result, the first mounting bracket 12
Is displaced axially downward with respect to the second mounting member 14, as shown in FIG. In the present embodiment, the upper contact rubber portion 100 and the bracket 106 are mounted in the mounted state of the engine mount 10 as described above.
The distance between the axial facing surfaces of the contact plate portion 110 and the distance between the axial facing surfaces of the lower contact rubber portion 102 and the upper fixing bracket 46 are
It is supposed to be almost the same. Then, the upper contact rubber portion 100 is brought into contact with the contact plate portion 110 of the bracket 106, so that the lower contact rubber portion 102 again.
Is brought into contact with the upper fixing member 46 so that the relative displacement amounts of both the bound side and the rebound side of the first mounting member 12 and the second mounting member 14 in the axial direction are buffered. Has become. Further, since the radial contact rubber portion 104 is brought into contact with the fixed portion 109 of the bracket 106, the relative displacement amount of the first mounting member 12 and the second mounting member 14 in the direction perpendicular to the axis is buffered. It is supposed to be done. As is clear from these, in the present embodiment, the abutting portion is formed by the upper fixing metal fitting 46, and the upper bottom portion 7 of the protective metal fitting 70 is formed.
4, the stopper portion is formed.

Further, in the engine mount 10 having the above-mentioned structure, the protective metal member 70 is provided with the diaphragm 4.
4 is disposed so as to cover substantially the entire portion, the protective metal fitting 70 avoids interference of other members with the diaphragm 44, contact of flying stones, etc., and damage to the diaphragm 44 is prevented. Therefore, the durability of the diaphragm 44 can be advantageously and stably ensured, and further, the radiant heat from the internal combustion engine or the like to the diaphragm 44 is blocked by the protective metal fitting 70, so that the deterioration of the diaphragm 44 due to the temperature rise. Therefore, the durability of the diaphragm 44 can be further improved.

In addition, in this embodiment, the stopper rubber 98 provided on the protective metal fitting 70 for protecting the diaphragm 44 as described above abuts the upper fixing metal fitting 46 and the bracket 106, so that the first mounting metal fitting 12 and A stopper mechanism for buffering the relative displacement of the second mounting member 14 is configured, whereby the engine mount 1 having both the heat seal mechanism and the stopper mechanism is provided.
0 can be realized with a simple structure.

Further, in this embodiment, the space between the protective metal fitting 70 and the lower fixing metal fitting 48 is sealed by the seal rubber 62, which prevents water and the like from entering between the protective metal fitting 70 and the lower fixing metal fitting 48. At the same time, the water or the like that has entered the inside of the protective fitting 70 through the through hole 73 is quickly discharged through the through hole 84 provided in the cylindrical wall portion 72 of the protective fitting 70. It is possible to reduce or avoid a decrease in durability due to corrosion or the like due to the retention of water.

Further, FIG. 5 shows an engine mount 116 as a second embodiment of the present invention. The engine mount 116 has a structure in which an electromagnet type vibrating device 120 as a vibrating unit is arranged below the mount body 118. In the following description, members and parts having the same structure as in the first embodiment will be denoted by the same reference numerals as those in the first embodiment in the drawings, and detailed description thereof will be omitted. .

More specifically, the mount main body 118 has the vibrating plate 124 as a movable member attached to the engine mount (10) of the first embodiment, and the engine of the first embodiment. A lower metal fitting 122 having a shape different from that of the mount (10) is used. Vibration plate 124
Is formed of a hard material such as metal, has a shallow bottomed cylindrical shape, and has a small-diameter cylindrical connection cylindrical portion 12 that projects downward and opens at the center of the bottom wall.
6 are integrally formed. In addition, on the outer peripheral side of the vibrating plate 124, the annular support plate-shaped support fitting 12 is formed so as to be spaced radially outward.
8 is provided, and the peripheral wall portion 130 of the vibrating plate 124 is
Cylindrical portion 132 integrally formed on the inner peripheral edge of the support fitting 128
Are arranged to face each other in the radial direction. Furthermore,
An annular support rubber elastic body 134 is disposed between the opposing surfaces of the peripheral wall portion 130 of the vibrating plate 124 and the cylindrical portion 132 of the support fitting 128, and the inner peripheral surface of the support rubber elastic body 134 is disposed. The peripheral wall portion 130 is fixed to the outer peripheral surface of the support rubber elastic body 134, and the cylindrical portion 132 is fixed to the outer peripheral surface of the supporting rubber elastic body 134.

The outer peripheral edge portion of the support fitting 128 is the flange portion 2 of the upper fitting 22 constituting the second mounting fitting 14.
8 and the upper connecting plate portion 136 of the lower metal fitting 122, which will be described later, are overlapped with each other, and the upper metal fitting 22 and the upper connecting plate portion 136 thereof are
Along with this, the caulking portion 80 of the protective metal fitting 70 is caulked and fixed, whereby the vibrating plate 124 is disposed so as to spread in the direction perpendicular to the axis at the axially lower opening side of the upper metal fitting 22, and The vibrating plate 124 constitutes a part of a wall portion of the pressure receiving chamber 86. By fixing the outer peripheral edge of the support fitting 128 in this manner, the vibrating plate 124 is elastically supported by the support fitting 128 so as to be relatively displaceable in the axial direction. By forcibly displacing the vibration plate 124 with an external force, the pressure in the pressure receiving chamber 86 can be positively changed and controlled.

On the other hand, the lower metal fitting 122 has a large-diameter cylindrical shape as a whole, and its upper end in the axial direction has a ring-shaped upper connecting plate portion 136 projecting outward in the radial direction.
Is integrally formed, and its lower end in the axial direction is
A lower mounting plate portion 138 is integrally formed so as to extend radially outward. Then, in the outer peripheral edge portion of the upper coupling plate portion 136, similarly to the lower metal fitting (24) of the engine mount of the first embodiment, with the flange portion 28 of the upper metal fitting 22, it is caulked to the lower end portion of the protective metal fitting 70. On the other hand, while being fixed, the lower mounting plate portion 138 is fixed to the body side by bolts (not shown) which are inserted and mounted in a plurality of bolt insertion holes 140 formed therein.

Further, in the cylindrical wall portion of the lower metal fitting 122, a pair of working windows 14 are provided at portions opposed to each other in one direction perpendicular to the axis.
2, 142 are formed and the working windows 1
The holding tubular metal fitting 144 is fitted into the axially lower part of the lower metal fitting 12 and the forming part of the lower metal fitting 42.
It is fixed so as to project downward in the axial direction from 2. Further, a cup-shaped case fitting 145 is fitted and fixed to the holding tubular fitting 144, and the electromagnet type vibration device 120 is housed and assembled to the case fitting 145.

As the electromagnet type vibration device 120,
Various structures that can generate a drive output toward the central axis direction and that can control the frequency of the drive output can be adopted. An example thereof will be briefly described below.

That is, in the electromagnet type vibration device 120 employed in this embodiment, the inner shaft metal fitting 146 and the outer tubular metal fitting 148 which are radially separated from each other and are arranged coaxially with each other.
Based on the magnetic action between the inner magnetic pole 150 and the outer magnetic pole 152 formed on the inner shaft metal fitting 146 and the outer cylinder metal fitting 148, a shaft is provided between the inner shaft metal fitting 146 and the outer cylinder metal fitting 148. The relative displacement force in the direction is exerted.

More specifically, the inner shaft fitting 146 has a small-diameter cylindrical shape and is made of a ferromagnetic material such as iron. A coil 154 wound in the circumferential direction is externally fixed to the axially central portion of the inner shaft fitting 146. In addition, the lead wire 1 for feeding the coil 154
56 is drawn from the outside through the inner hole of the inner shaft fitting 146. Furthermore, on both sides in the axial direction of the coil 154, a pair of upper and lower plate fittings 15 having a thick annular plate shape are provided.
8, 158 are externally inserted, and they are fixedly assembled by being superposed on both axial sides of the coil 154. The pair of plate metal fittings 158, 158 are formed of a ferromagnetic material, each inner peripheral surface is fixed in contact with the outer peripheral surface of the inner shaft metal fitting 146, and the inner peripheral surface of each outer peripheral edge portion is also similarly formed. A pair of upper and lower ring fittings 160 made of a ferromagnetic material,
160 is fixed. Then, the pair of ring metal fittings 160, 160 is provided with a pair of upper and lower plate metal fittings 158, 15
The coil 154 projects inward in the axial direction and is spaced apart from the outer circumference of the coil 154.

As a result, around the coil 154, the inner shaft fitting 146 made of a ferromagnetic material is formed.
And upper and lower plate fittings 158, 158 and upper and lower ring fittings 16
The inner yoke 162, which extends in a substantially C-shaped cross section or a U-shaped cross section and extends over the entire circumference in the circumferential direction, in cooperation with each other.
Are formed. Then, when power is supplied to the coil 154, a magnetic field is generated by the magnetic action of the current, and the coil 15
4 functions as an electromagnet, the inner yoke 16
2 is given a magnetic pole according to the energization direction to the coil 154. That is, when power is supplied to the coil 154, the inner yoke 162 has an N edge by the outer peripheral edge of one of the upper and lower plate fittings 158 and the ring fitting 160.
The magnetic poles are configured, and the S magnetic pole is formed by the outer peripheral edge of the upper and lower plate fittings 158 and the ring fitting 160, whereby the outer peripheral edge of the upper plate fitting 158 and the ring fitting 160, and the lower fitting. The annular magnetic path is blocked between the outer peripheral edge portion of the side plate fitting 158 and the ring fitting 160, and a magnetic gap is formed between the upper and lower plate fittings 158 and 158.

On the other hand, in the outer tubular metal member 148, a pair of upper and lower outer yoke metal members 164 and 164, which are made of a ferromagnetic material such as iron and have a large-diameter substantially cylindrical shape, are axially overlapped with each other. Is formed by. Then, the pair of outer yoke fittings 164, 16
4, a cover fitting 1 having a large diameter inverted cup shape
66 is externally fitted and fixed, and an output rod 167 protruding upward in the axial direction is fixedly provided at the center of the upper bottom portion of the cover fitting 166. Further, each outer yoke fitting 164 is integrally formed with an annular convex portion 168 protruding radially inward from an axial middle portion, and the convex portion 168 of the upper outer yoke fitting 164 is located above the inner yoke 162. The plate metal fitting 158 of the inner yoke 162 is positioned so as to face the plate metal fitting 158 of the inner yoke 162 with a gap of a predetermined distance in the radial direction. They are opposed to each other with a gap of a predetermined distance in the radial direction.

The inner peripheral surface of the convex portion 168 of the outer yoke member 164 on the upper side is different from the inner magnetic pole 150 on the upper side formed by cooperation of the outer peripheral surfaces of the plate member 158 and the ring member 160. Therefore, it is positioned so as to be offset outward (upward) in the axial direction. On the other hand, the inner peripheral surface of the convex portion 168 of the lower outer yoke fitting 164 is connected to the lower inner magnetic pole 150 formed by the outer peripheral surfaces of the lower plate fitting 158 and the ring fitting 160 in cooperation with each other. On the other hand, it is positioned so as to be axially outward (downward).

Further, in the outer tubular metal member 148, a ring-shaped permanent magnet 170 is fitted and fixed to the inner peripheral surface of the axially butted portions of the pair of outer yoke metal members 164, 164. There is. This permanent magnet 170 is
It is magnetized in the radial direction, and its inner peripheral surface is one magnetic pole surface, and its outer peripheral surface is the other magnetic pole surface. The outer peripheral surface of the permanent magnet 170 is closely contacted with the outer yoke fittings 164 and 164, while
The inner peripheral surface of the permanent magnet 170 has upper and lower outer yoke fittings 16
The protrusions 168, 168 of the nozzles 4, 164 have substantially the same height as the protrusions 168, 168, and are arranged so as to project radially inward. Furthermore, the permanent magnet 170 is axially positioned with respect to the gap between the pair of upper and lower magnetic pole portions formed on the inner shaft metal fitting 146 side.

The outer magnet 152 is formed by fixing the permanent magnet 170 to the outer tubular member 148 in this manner, and one of the magnetic pole surfaces is formed by the inner peripheral surface of the permanent magnet 170. The inner peripheral surfaces of the pair of convex portions 168, 168 of the outer tubular metal member 148 form the pair of other magnetic pole surfaces.

Further, the inner shaft fitting 146 and the outer tubular fitting 148 are elastically connected by a pair of leaf springs 172 and 172 which are located on both sides in the axial direction and spread in the direction orthogonal to the axis. Relative elastic displacement in the substantially axial direction is allowed with respect to the shaft fitting 146 and the outer tubular fitting 148.

In the electromagnet type vibration device 120 having such a structure, when the coil 154 is not energized,
Based on the elastic force of the leaf springs 172 and 172 and the balance of the magnetic force between the upper and lower magnetic pole surfaces on the inner side and the magnetic pole surface on the outer side, the inner shaft metal fitting 146 and the outer tubular metal fitting 148 are provided with the shafts as described above. The holding force to the neutral position in the direction and the axial restoring force to the neutral position are exerted. In addition, by supplying power to the coil 154,
Based on the magnetic force exerted between the upper and lower magnetic pole surfaces on the inner side and the magnetic pole surface on the outer side, relative displacement in the axial direction according to the energization direction to the coil 154 with respect to the inner shaft metal fitting 146 and the outer tubular metal fitting 148. It is designed to exert force. Therefore, by supplying alternating current, pulsating current, pulse current, or the like to the coil 154, a relative exciting force in the axial direction is exerted on the inner shaft fitting 146 and the outer tubular fitting 148 as a driving force. It is done.

Then, such an electromagnet type vibration device 120 is used.
Is housed and arranged in a case metal member 145 fixed to the lower metal member 122 constituting the second mounting metal member 14,
The inner shaft metal fitting 146 and the outer tubular metal fitting 148 are arranged on the same central axis as the mount main body 118 by inserting the inner shaft metal fitting 146 through the center of the bottom wall of the case metal fitting 145 and tightening and fixing with the fixing nut 174. It is located. As a result, the inner shaft fitting 146 is fixed to the second mounting fitting 14, while the outer tubular fitting 148 is fixed.
The output rod 167 that is fixed to the connecting member is fixed to the vibrating plate 124 such that the output rod 167 is protruded axially upward from the opening of the case fitting 145. It is fitted in 126 and is caulked and fixed. The connecting tube portion 126 and the output rod 167 are caulked and fixed, so that the work window 142 provided on the lower metal fitting 122,
It can be done through 142. A dust cover 176 made of a rubber elastic film is disposed in the opening of the case fitting 145, and the dust cover 176 allows the output rod 167 and the case fitting 1 to be inserted.
The opening between the upper edge of 45 and the upper edge is sealed.

By connecting and fixing the output rod 167 to the connecting cylinder portion 126 as described above, the driving force generated in the electromagnet type vibration device 120 is applied from the output rod 167 to the vibration plate 124. Vibrating plate 124
Is reciprocally excited in the axial direction. Therefore, by vibrating the vibrating plate 124 according to the frequency and phase of the vibration to be isolated, the pressure in the pressure receiving chamber 86 is positively controlled so that the active anti-vibration effect can be exerted. Has become.

Also, with the engine mount 116 of this embodiment having such a structure, it is possible to obtain the same effects as in the first embodiment, and in addition, in particular, in such engine mount 116. Since the orifice member and the like are not provided in the pressure receiving chamber 86 and the volume of the pressure receiving chamber 86 is set large, the vibrating plate 1
24 can be formed in a large effective area, whereby a small displacement of the vibrating plate 124 allows the pressure receiving chamber 86 to be formed.
There is an advantage that the pressure of can be efficiently controlled.

Although several embodiments of the present invention have been described in detail above, these are merely examples, and the present invention is construed in a limited way by the specific description of the embodiments. Not a thing.

For example, although only one orifice passage is formed in the above embodiment, a plurality of orifice passages tuned to different frequency ranges may be formed according to the required vibration isolation characteristics and the like. Is also possible.

Further, in the above-described embodiment, a cutout portion having substantially the same volume as the slope 94 is provided in a portion symmetrical to the portion where the slope 94 is formed with respect to the central axis of the main rubber elastic body 16, or It is also possible to integrally form a built-up portion having substantially the same volume as the slope 94 on the inner peripheral surface side of the formation portion of the main rubber elastic body 16 of the slope 94, whereby the volume of the main rubber elastic body 16 is reduced. A good balance can be achieved in the circumferential direction around the central axis.

Further, in the second embodiment, the electromagnet type vibration device 120 is adopted as the vibration means, but in the present invention, various known types such as pneumatic type, electrostrictive type and magnetostrictive type are used. It is also possible to adopt a vibrating device, and particularly if a pneumatic vibrating device is adopted, it becomes possible to simplify the entire structure of the engine mount.

Further, in the second embodiment, the vibration plate 124 is made of a hard material such as metal, but it can be made of an elastic material such as a rubber elastic body.

Further, in the above-mentioned embodiment, the notch 82 is provided in the protective metal fitting 70, but the notch 82 need not necessarily be provided depending on the mounting structure of the first mounting member to the vibrating member.

Further, in the above embodiment, the stopper rubber 9
8 is abutted on the upper fixing member 46 and the bracket 106, but may be abutted only on the bracket 106.

In addition, in the above-mentioned embodiment, a specific example of the present invention applied to an engine mount for an automobile is shown. However, in addition to this, the present invention is applicable to various types of vibration prevention members for various vibration members that require reduction of vibration. Any of the shaking devices can be advantageously applied.

Although not listed one by one, the present invention
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0081]

As is apparent from the above description, in the fluid filled type vibration damping device having the structure according to the present invention, the heat seal tubular body covers the tubular flexible film substantially entirely. Since it is arranged as described above, problems such as damage due to interference with other members of the tubular flexible film and deterioration of the tubular flexible film due to heat from the internal combustion engine etc. It can be advantageously reduced or prevented.

Moreover, in the fluid filled type vibration damping device according to the present invention, the stopper mechanism for limiting the relative displacement of the first mounting member and the second mounting member is utilized by making good use of such a heat-sealing cylinder. Since it is configured, such a stopper mechanism can be realized with a simple structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an engine mount as a first embodiment of the present invention.

2 is a side view of the engine mount shown in FIG. 1. FIG.

3 is a plan view of the engine mount shown in FIG. 1. FIG.

FIG. 4 is a cross-sectional view showing a mounted state of the engine mount shown in FIG.

FIG. 5 is a cross-sectional view showing an engine mount according to a second embodiment of the present invention.

[Explanation of symbols]

10 engine mount 12 First mounting bracket 14 Second mounting bracket 16 Rubber elastic body 26 Cylinder wall 44 diaphragm 70 Protective fitting 74 Upper bottom 86 Pressure chamber 88 Equilibration room 96 orifice passage 98 stopper rubber

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiko Kato             Tokai Rubber Works, Higashi 3-chome, Komaki City, Aichi Prefecture             Business (72) Inventor Ken Katagiri             Tokai Rubber Works, Higashi 3-chome, Komaki City, Aichi Prefecture             Business F-term (reference) 3D035 CA05 CA06 CA35 CA37                 3J047 AA03 AB01 CA04 CB10 CD08                       CD11 FA02 FA03

Claims (8)

[Claims] 1. A first mounting member is spaced apart from one opening side of a tubular portion of the second mounting member, and at the one opening side of the tubular portion of the second mounting member. By disposing the main body rubber elastic body, fixing the outer peripheral edge portion of the main body rubber elastic body to the tubular portion, and fixing the first mounting member on the central axis of the main body rubber elastic body, While elastically connecting the first mounting member and the second mounting member with the main body rubber elastic body, one opening of the cylindrical portion of the second mounting member is fluid-tightly closed, and A non-compressible fluid is enclosed inside the tubular portion of the second mounting member to form a pressure-receiving chamber in which a part of the wall portion is formed by the main rubber elastic body, while the main rubber elastic body is connected to the second elastic member. The outer peripheral surface of the main rubber elastic body while projecting outward from the mounting member in the axial direction with a tapered outer peripheral surface. The tubular flexible film is spaced apart so as to cover the outer peripheral side of the main rubber elastic body, and a non-compressible fluid is enclosed by a part of the wall made of the tubular flexible film. In a fluid-filled type vibration damping device having an equilibrium chamber and an orifice passage connecting the equilibrium chamber to the pressure receiving chamber, a heat-sealing cylinder is externally arranged on the outer peripheral side of the tubular flexible membrane. While fixing the axial base end portion of the heat seal tubular body to the second mounting member, the axial tip end portion of the heat seal tubular body is extended inward in the direction perpendicular to the axis, Forming a stopper portion that is opposed to the mounting member in the axial direction and / or the axis-perpendicular direction, and contacting the stopper portion with the first mounting member via a buffer member The relative displacement between the first mounting member and the second mounting member is elastically limited. A fluid filled type vibration damping device characterized in that 2. A first fixing member is fixed to one end portion of the tubular flexible film in the axial direction, and the first fixing member is fixed to the first mounting member and the first fixing member is fixed to the first mounting member. By extending outward from the mounting member in the direction perpendicular to the axis, the stopper portion of the heat-sealing tubular body forms an abutting portion that abuts in the axial direction, while the axial direction of the tubular flexible membrane is formed. A second fixing member is fixed to the other end portion, and the second fixing member is arranged along the inner peripheral surface of the axial base end portion of the heat-sealing cylinder so that the heat-sealing cylinder and The fluid filled type vibration damping device according to claim 1, wherein the second mounting member is caulked and fixed to the tubular portion. 3. A seal rubber for preventing water and the like from entering between the second fixing member and the heat-sealing cylinder at the end of the tubular flexible membrane on the side of the second fixing member. The fluid filled type vibration damping device according to claim 2, which is integrally formed over the entire circumference. 4. The second fixing member is externally arranged with respect to the tubular portion of the second mounting member, and the tubular portion of the second mounting member and the second fixing member are placed between them. The fluid filled type vibration damping device according to claim 2 or 3, wherein a circumferential passage extending in the circumferential direction is formed, and the orifice passage is formed by interconnecting the pressure receiving chamber and the equilibrium chamber through the circumferential passage. . 5. The main body rubber elastic body is provided in the tapered tubular portion, wherein one opening in the axial direction of the tubular portion of the second mounting member is a tapered tubular portion that expands outward in the axial direction. While fixing the outer peripheral edge portion of the body, a cutout window is provided in the tapered cylindrical portion, and a guide groove extending from the cutout window is formed on the outer peripheral surface of the main rubber elastic body, and the cutout window and the guide groove are formed. The fluid-filled type vibration damping device according to claim 4, wherein the orifice passage is connected to the equilibrium chamber through the. 6. The fluid filled type vibration damping device according to claim 5, wherein the guide groove has a slope shape in which the depth dimension gradually decreases as the distance from the cutout window increases. 7. The body rubber elastic body, so that the volume in the body rubber elastic body is substantially symmetrical with respect to the center axis, in the body rubber elastic body, in consideration of the guide groove, a cutout portion and 7. The fluid filled type vibration damping device according to claim 5 or 6, wherein a volume adjusting portion including a buildup portion is formed. 8. A movable member is disposed on the other opening side of the tubular portion of the second mounting member, and the movable member is supported so as to be relatively displaceable with respect to the second mounting member. A vibrating means is provided which constitutes a part of a wall portion of the pressure receiving chamber by the movable member, and which is provided with a vibrating means capable of positively producing a pressure fluctuation in the pressure receiving chamber by exerting a vibrating force on the movable member. The fluid filled type vibration damping device according to any one of 1 to 7.