JP3518451B2 - Fluid-filled cylindrical mount - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cylindrical mount used for an automobile engine mount, a body mount, a differential mount, a suspension bush, and the like, and particularly to obtain a vibration damping effect based on a flow action of a fluid enclosed inside. The present invention relates to the fluid-filled cylindrical mount.

[0002]

2. Description of the Related Art Conventionally, as a kind of a vibration-proof connecting body or a vibration-proof supporting body interposed between members constituting a vibration transmission system,
While a support shaft member and an outer cylinder member, which are arranged at a predetermined distance in the radial direction from each other, are connected by a rubber elastic body, a predetermined incompressible fluid is sealed between the support shaft member and the outer cylinder member. Encapsulating a fluid that forms a plurality of fluid chambers, provides an orifice passage that connects the fluid chambers to each other, and obtains a vibration damping effect based on the flow action such as the resonance action of the fluid flowing through the orifice passages. Style tubular mounts are known.

In such a cylindrical mount, a seal sleeve having a plurality of window portions is generally fixed to the outer peripheral surface of the rubber elastic body for the purpose of facilitating the fluid filling work and the like. The pressure receiving chamber and the equilibrium chamber are formed by forming a pocket portion opening to the outer peripheral surface through the portion and fitting an outer cylinder member to the outer peripheral surface of the seal sleeve to cover the window portion. Further, the orifice passage is provided on the outer peripheral surface of the seal sleeve between the window portions in order to prevent a change in the flow passage cross-sectional area at the time of vibration input, as described in JP-A-56-164242. It is formed by covering the recessed groove provided over the outer cylinder member with an outer cylinder member, or, as disclosed in JP-A-61-27.
As described in Japanese Patent No. 0533, by disposing an annular member that straddles the window portion on the outer peripheral surface of the seal sleeve and covering the concave groove provided on the outer peripheral surface of the annular member with the outer cylindrical member, Has been formed.

However, in the former orifice structure described in JP-A-56-164242, since the length of the orifice passage is limited to the distance between the windows, the degree of freedom in designing the orifice passage is low and sufficient. However, in the latter orifice structure described in Japanese Patent Laid-Open No. 61-270533, an annular member must be separately formed and assembled, which results in manufacturability and cost efficiency. There was a problem that it decreased.

On the other hand, Japanese Utility Model Publication No. 5-47580 discloses that
Uses a stepped cylindrical seal sleeve whose diameter in the axial center part is narrowed over the entire circumference in the circumferential direction, and forms a groove extending in the circumferential direction on the outer peripheral surface of the axial end of the small diameter part. Then, by covering the concave groove with an outer cylinder, an orifice passage is formed that extends axially laterally of the liquid chamber (fluid chamber) and extends in the circumferential direction by a length of half a circumference or more. .

However, in such a structure, in order to secure a large volume of the equilibrium chamber, it is necessary to reduce the diameter of the axially central portion of the seal sleeve over the entire circumference. When it is attempted to expand the small diameter part to the axial end of the seal sleeve, the axial end of the seal sleeve fitted to the outer cylinder is deformed, and the sealing performance between the seal sleeve and the outer cylinder is reduced. There was a risk that it would be insufficient. Moreover, in order to reduce the manufacturing cost, if a pair of semi-cylindrical bodies formed by bending the plate material are butt-welded to each other and welded together to form a seal sleeve, the welded portions of both semi-cylindrical bodies are stepped. Since it was bent into a shape, there were problems that welding was difficult and manufacturing was troublesome.

Further, the liquid-sealing anti-vibration support device disclosed in Japanese Utility Model Laid-Open No. 5-47580 has one means for restricting an excessive radial displacement between the inner cylinder and the outer cylinder.
The overhanging portion serving as a stopper is provided on the outer cylinder side in the space between the inner and outer cylinders, and the excessive displacement can be regulated by the contact of the inner cylinder with the overhanging portion. However, there is a problem in that, by disposing such an overhang portion, one of the two liquid chambers (fluid chambers) communicating with each other in the orifice passage is divided, There is a problem that the space for forming the chamber cannot be sufficiently secured, the space for forming the orifice passage is not sufficient, and the problem that the cross-sectional area changes due to the deformation of the orifice passage is inherent.

[0008]

The present invention has been made in view of the above circumstances, and the problem to be solved is to divide an equilibrium chamber, which is a fluid chamber, into two in the mount circumferential direction. Can be formed without
Another object of the present invention is to provide a fluid-filled cylindrical mount that can effectively prevent a change in the cross-sectional area of the orifice passage even when a large load is input.

[0009]

In order to solve such a problem, a feature of the present invention resides in that a support shaft member and a seal sleeve surrounding the support shaft member at a predetermined distance are formed of a rubber elastic body. While the first pocket portion and the second pocket portion which are opened to the outer peripheral surface through the seal sleeve are provided, the outer cylinder member is fitted and fixed to the outer peripheral surface of the seal sleeve to form the first pocket. By covering the opening of the portion with the outer tubular member, a part of the wall portion is formed of a rubber elastic body to form a pressure receiving chamber into which vibration is input, and the opening of the second pocket portion is provided with the outer tubular member. By covering with, a part of the wall part is formed of a thin elastic rubber elastic body to form a variable volume equilibrium chamber, and the pressure receiving chamber and the equilibrium chamber are filled with incompressible fluid and Chamber and equilibrium chamber In a fluid-filled cylindrical mount having an orifice passage therethrough, on either side of the axial direction that sandwiches the equilibrium chamber in the axial direction, from either side of the support shaft member or the seal sleeve to the other side. The stopper portions are provided so as to project in the opposite direction of the axis-perpendicular direction and to limit the relative displacement amount of the support shaft member and the outer cylinder member in the axis-perpendicular direction by abutting against the other side.

In the fluid-filled tubular mount according to the present invention having such a structure, the stopper portions are positioned on both axial sides of the equilibrium chamber, so that the supporting shaft member and the outer tubular member are relatively positioned. Since the displacement amount is limited, it is possible to form the equilibrium chamber without substantially dividing the equilibrium chamber in the circumferential direction, and to use a rubber elastic body that forms the orifice passage even when a large load is input. The load input is prevented, and the change in cross-sectional area of the orifice passage can be prevented more effectively.

In the fluid-filled tubular mount according to the present invention, in order to liquid-tightly seal the pressure receiving chamber, the equilibrium chamber and the orifice passage, the space between the seal sleeve and the outer tubular member is fitted. It is desirable to interpose a seal rubber layer, and it is particularly preferable to integrally form a seal rubber layer that covers the outer peripheral surface of the seal sleeve over the entire surface with the rubber elastic body. As a result, the seal rubber layer can be easily formed, and the fluid tightness of the mount can be advantageously secured, and the seal rubber layer is located between the first window portion and the second window portion. By forming a groove in the seal rubber layer on the outer peripheral surface of the seal sleeve, the connection groove can be easily formed.

Further, the rubber elastic body forming the wall portion of the second pocket portion may be a thin portion at least a portion of which is easily deformable, but preferably, the wall portion of the second pocket portion is formed. The rubber elastic body constituting the is a bag-like shape having a thin wall over the entire bottom wall portion and the peripheral wall portion of the second pocket portion, whereby a large volume variable amount of the equilibrium chamber can be secured, The generated stress of the rubber elastic body forming the orifice passage can be suppressed, and the change in the cross-sectional area of the orifice passage can be prevented more effectively.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, FIGS. 1 and 2 show an FF type engine mount 10 for an automobile as a first embodiment of the present invention. The engine mount 10 includes an inner cylinder fitting 12 as a support shaft member and an outer cylinder fitting 1 as an outer cylinder member.
4 are arranged at a predetermined distance in a radial direction from each other and are eccentric by a predetermined amount, and are connected by a rubber elastic body 16 interposed between them, and the inner tubular fitting 12 and the outer The tubular metal fitting 14 is attached to each of the power unit and the body (not shown), so that the power unit can be supported in a vibration-proof manner with respect to the body. The engine mount 10
Under the mounted state, the weight of the power unit is input in the substantially vertical direction in FIGS. 1 and 2, and the rubber elastic body 16 is elastically deformed, so that the inner cylindrical metal fitting 12 and the outer cylindrical metal fitting 14 are substantially co-axial. While being positioned, the main vibration load is input in substantially the same direction as the power unit weight input direction.

More specifically, as shown in FIGS. 3 and 4, the inner tubular member 12 has a thick-walled cylindrical shape, and a fiber reinforced resin or An action member 18 made of a hard material such as metal is fixed. The acting member 18 projects radially outward at a central portion of the inner tubular metal fitting 12 in the axial direction, and has a substantially mushroom-shaped umbrella portion 20 with a tip end portion spreading like an umbrella, and at both axial side portions of the inner tubular metal fitting 12. Each of the stopper portions 22, 2 has a substantially rectangular block shape and projects outward in the radial direction opposite to the umbrella portion 20.
2 is integrally provided.

Further, a metal sleeve 24 as a seal sleeve is eccentrically arranged at a predetermined distance outward in the radial direction and eccentric by a predetermined amount on the outer side of the inner cylindrical metal member 12 to which the working member 18 is fixed. It is arranged so as to surround the inner cylindrical metal member 12. This metal sleeve 24 is shown in FIGS.
As shown in Fig. 7, it has a large-diameter, thin-walled cylindrical shape as a whole, and has a substantially rectangular first window that extends in the circumferential direction at a length of a half or less in the circumferential direction. Part 26
And the second window portion 28 are formed to face each other in one radial direction. Further, in the metal sleeve 24, the connecting portions 30, 30 located between both ends of the first window portion 26 and the second window portion 28 in the circumferential direction are slightly recessed inward in the radial direction at the central portion in the axial direction. The first window 26
Wide recesses 32, 32 are formed so as to extend across both circumferential edge portions of the second window portion 28. That is, in the metal sleeve 24, the pair of annular plate-shaped portions 34, 34, which are opposed to each other on the same axis with a predetermined distance in the axial direction, are integrally connected by the pair of connecting portions 30, 30. It is a structure.

The metal sleeve 24 as described above can also be manufactured by subjecting the tubular body to perforation processing or the like. In particular, in the present embodiment, a pair of flat plates are used, and perforation processing and Pressed, bent, etc.,
It is advantageously manufactured by abutting and welding at both ends in the circumferential direction (part a in FIG. 6). That is, if the metal sleeve 24 is manufactured using a pair of flat plates, the first and second window portions 26 and 28 and the connecting portions 30 and 30 can be easily formed, as compared with the case where a tubular body is used. There are advantages such as reduction in manufacturing cost. Further, if a welded portion is set in the opening portions of the first and second window portions 26, 28 as in the present embodiment, the welded portion will be a flat surface without steps and the like, so that the welding operation is easy. It becomes.

Further, the inner tubular member 12 and the metal sleeve 24
A rubber elastic body 16 is interposed between the two. As shown in FIGS. 8 to 13, the rubber elastic body 16 has a thick, generally cylindrical shape as a whole, and the inner cylindrical metal member 12 is provided on the inner peripheral surface thereof and the metal sleeve is provided on the outer peripheral surface thereof. 24 is formed as an integrally vulcanized molded product 36 which is vulcanized and adhered. Further, a seal rubber layer 38 is formed on the outer peripheral surface of the metal sleeve 24 over substantially the entire surface thereof, and the connecting portion 3
The recess 32 of 0 is also filled with the seal rubber layer 38. The seal rubber layer 38 is formed integrally with the rubber elastic body 16.

Further, the rubber elastic body 16 has an inner cylindrical metal member 12
The first pocket portion 42 is provided on one side of the metal sleeve 24 in the eccentric direction (the side where the separation distance in the eccentric direction is large, that is, the upper side in FIG. 9). It is opened to the outer peripheral surface through one window portion 26, and the inner tubular metal member 12 and the metal sleeve 2
The second pocket portion 44 is provided on the other side of the eccentric direction 4 (the side where the separation distance in the eccentric direction is smaller, that is, the lower side in FIG. 9), and the second window of the metal sleeve 24 is provided. It opens to the outer peripheral surface through the portion 28. Further, inside the first pocket portion 42, from the center of the bottom portion to the umbrella portion 20.
Is projected, and between the outer peripheral surface of the umbrella portion 20 and the inner peripheral surface of the first pocket portion 42, as shown in FIG.
The narrowed portion 46 is formed. In addition, the rubber elastic body 1 forming the bottom wall portion 48 of the second pocket portion 44
A slit 49 extending through the shaft 6 is provided over substantially the entire surface of the bottom wall portion 48, so that the bottom wall portion 48 is thin and easily deformed.

Due to the structure of the molding die for the rubber elastic body 16,
Since the rubber elastic body 16 is filled between the stopper portions 22 and 22 provided on the inner cylindrical metal fitting 12, the second pocket portion 44 corresponding to the disposing portion of the stopper portions 22 and 22 is formed. The central portion in the circumferential direction is shallow. Further, the protruding tip surfaces of the stopper portions 22 and 22 are positioned to face the annular plate portions 34 and 34 of the metal sleeve 24 in the radial direction, respectively. Furthermore, the protruding tip surfaces of the stopper portions 22 and 22 and the first pocket portion 4
A cushioning rubber layer 50 is formed on each of the outer peripheral surfaces of the umbrella portion 20 projecting from the inside.

Further, the second pocket portion 44 is shown in FIG.
As shown in FIG. 2, the openings of the circumferentially opposite side portions, which are located on both sides of the central portion which is the shallow bottom, are biased opening portions 52, 52 which are biased to the opposite sides in the axial direction. The portions 52, 52 are spaced apart from each other with respect to the opening edge portion of the second window portion 28 of the metal sleeve 24 in mutually different axial directions. Then, between the opening edge portion of the second window portion 28 and the bias opening portion 52, on the axial side of each one of the bias opening portions 52 separated from the opening edge portion of the second window portion 28, respectively. Groove 54 extending in the circumferential direction
Is formed, and one end portion in the circumferential direction of the concave groove 54 is
It is connected to the other biased opening 52. Further, as shown in FIG. 11, the other end portion in the circumferential direction of each recessed groove 54 is arranged in the circumferential direction of the first pocket portion 42 via the connection groove 56 formed in the connecting portion 30 of the metal sleeve 24. Connected to the end. The connection groove 56 is formed by the metal sleeve 24.
At the axial end of each of the connecting portions 30, the rubber elastic body 16 filled in the recess 32 is provided with a groove that opens in the outer peripheral surface and extends in the circumferential direction (FIG. 12). reference).

In short, in the present embodiment, the pair of recessed grooves 54, 54 and the connection grooves 56, 56 respectively extend in the circumferential direction from both circumferential end portions of the first pocket portion 42 to form the second pocket. A pair of orifice forming grooves 58, 5 extending circumferentially along the axial side portion of the one bias opening portion 52 in the pocket portion 44 and reaching the other bias opening portion 52.
8 are formed on both sides in the axial direction of the outer peripheral surface of the integrally vulcanized molded product 36.

On the outer peripheral surface of the seal rubber layer 38,
As is apparent from FIGS. 10 to 13, a seal lip 60 extending in the circumferential direction and the axial direction is formed, and by the seal lip 60, the first pocket portion 42, the second pocket portion 44, the orifice forming groove. Each of the openings 58, 58 is surrounded.

Further, the recessed groove 54 forming the orifice forming groove 58 is formed in close proximity along the opening edge of the second window portion 28 of the metal sleeve 24, whereby the recessed groove 54 is formed. The deformation of the rubber elastic body 16 forming the wall portion is prevented as much as possible. In addition, in particular,
In the present embodiment, of the rubber elastic body 16 forming the opening peripheral edge portion of the second pocket portion 44, the axial direction side in which the concave groove 54 is formed is thicker than the other axial direction side, The deformation of the wall portion of the concave groove 54 can be suppressed more effectively. Further, the partition wall portion 62 configured by the rubber elastic body 16 for partitioning the concave groove 54 and the second pocket portion 44,
Along the entire length, the seal rubber layer 38 formed on the outer peripheral surface of the metal sleeve 24 is protruded radially outward at substantially the same height, and a seal lip 60 is formed on the tip end surface thereof. There is.

Then, as shown in FIGS. 1 and 2, the outer tubular metal fitting 14 is externally inserted into the integrally vulcanized molded product 36 having such a structure, and the metal sleeve is drawn by drawing. It is fitted and fixed to the outer peripheral surface of 24. As a result, the first pocket portion 42, the second pocket portion 44, and the orifice forming grooves 58, 58 are covered with the outer tubular metal fitting 14, respectively, so that part of the wall portion is covered with the rubber elastic body 16. And a bottom wall portion 48 whose wall portion is easily deformable, and a volume change based on the deformation of the bottom wall portion 48. Equilibrium chambers 66 that are easily permitted, and orifice passages 68, 68 that connect the pressure receiving chambers 64 and the equilibrium chambers 66 to each other are formed.

The pressure receiving chamber 64, the equilibrium chamber 66, and the orifice passages 68, 68 are filled with a predetermined incompressible fluid such as water, alkylene glycol, polyalkylene glycol, or silicone oil. It should be noted that the encapsulation of the incompressible fluid can be advantageously performed by, for example, assembling the outer tubular metal fitting 14 to the integrally vulcanized molded product 36 in the fluid.

In the engine mount 10 having such a structure, as is well known, the orifice passage 68 is based on the pressure difference generated between the pressure receiving chamber 64 and the equilibrium chamber 66 at the time of vibration input. , 68, a fluid flow is generated, and this orifice passage 68,
Based on the resonance action of the fluid that is made to flow through 68, for example, a damping effect for low-frequency vibrations such as shakes, a vibration insulating effect for medium or high-frequency vibrations such as idling vibrations or muffled sounds, and the like can be exhibited. In the present embodiment, inside the pressure receiving chamber 64,
The constricted portion 46 that causes the fluid flow at the time of vibration input is the umbrella portion 2.
Since it is formed of 0, a predetermined vibration damping effect can be obtained by the resonance action of the fluid flowing through the narrowed portion 46 and the like.

Here, in the engine mount 10 as described above, the orifice passage 6 provided in the rubber elastic body 16 forming the peripheral wall portion of the second pocket portion 44.
In addition to the large wall rigidity being imparted to the concave groove 54 forming the groove 8 by the metal sleeve 24 located in the vicinity thereof, the equilibrium chamber 66 formed adjacent to the concave groove 54 is
A large change in internal pressure does not occur even when a vibration is input, and a large internal stress is prevented from being transmitted to the rubber elastic body 16 forming the wall portion of the groove 54, so that the groove 54 is effectively deformed. Will be prevented.

Therefore, as is conventional, the metal sleeve 2
4 does not need to have a groove 54 formed on the outer peripheral surface of the metal sleeve 24 by reducing the diameter of the central portion of the shaft 4 in the entire axial direction, or to use a separate member for forming the orifice passage 68. The cross-sectional area can be secured stably, and the orifice passage 68 having a long flow passage length can be easily formed, whereby the orifice passage 6 is formed.
8. As a result, it is possible to improve mount flexibility and cost as well as the degree of freedom in tuning the mount anti-vibration characteristics.

In addition, in the engine mount 10 of the present embodiment, concave grooves extending in the circumferential direction along the inner peripheral edge of the second window portion 28 of the metal sleeve 24 on both axial sides of the second pocket portion 44. 54, 54 are formed, and the pair of orifice passages 68, 68 are formed by these recessed grooves 54, 54. Therefore, the vibration damping effect based on the resonance action of the fluid flowing through the orifice passage 68 is It can be exerted more effectively.

Further, the engine mount 10 of this embodiment.
In the above, the stopper portions 22 and 22 projecting from the inner tubular metal fitting 12 side toward the outer tubular metal fitting 14 side are respectively disposed on both sides of the equilibrium chamber 66 and the orifice passage 68 in the axial direction. Since the load input to the wall of the equilibrium chamber 66 and the orifice passage 68 is reduced or prevented when the portions 22 and 22 come into contact with the outer tubular metal fitting 14 side, the equilibrium chamber 66 and the orifice are prevented. While ensuring a sufficient space for forming the passage 68, the stopper portion 2
A mechanism (stopper mechanism) for limiting the amount of relative displacement of the inner and outer tubular metal fittings 12, 14 in the radial direction by 2, 2 can be advantageously provided, and moreover, the relative movement of the inner and outer tubular metal fittings 12, 14 by the stopper portions 22, 22. Even when the amount of static displacement is limited,
Deformation of the equilibrium chamber 66 and the orifice passage 68 can be advantageously prevented, and the desired vibration damping effect can be stably exhibited.

By the way, FIGS. 14 and 15 show an integrally vulcanized molded product 70 constituting an engine mount as another embodiment of the present invention. In this example,
Compared with the first embodiment, since it shows another specific example of the concave groove for forming the orifice passage,
Only the drawings corresponding to FIGS. 12 and 13 in the first embodiment shall be shown, and in the drawings, the members and parts having the same structures as those of the first embodiment are respectively shown in the first embodiment. The detailed description will be omitted by assigning the same reference numerals to those in the embodiment.

In short, in the integrally vulcanized molded article 70 shown in FIGS. 14 and 15, one bias opening (52) in the second pocket portion 44 is made smaller, and the opening portions on both sides in the axial direction and Each of the openings on the circumferential end side has the second window portion 28 in the metal sleeve 24.
It is a small opening 72 which is spaced apart from the inner peripheral edge of the shaft in the axial and circumferential directions. Then, the connection groove 5 extending from one circumferential edge of the first pocket portion 42.
6, a groove 54 extending in the circumferential direction on one axial side of the biased opening 52 is formed so as to surround the small opening 72 and extends around the outside of the small opening 72. And extends in the circumferential direction by changing the direction by 180 degrees and is connected to the other side of the bias opening 52 in the axial direction. In short, in this embodiment, the concave groove 54 is formed around the opening of the second pocket portion 44 in the circumferential direction with a length of half a circumference or more.

Therefore, if the groove 54 having such a configuration is adopted, the length of the orifice passage 68 can be set longer, and the orifice passage 68 and the mount vibration isolation characteristic can be freely adjusted. Further improvement can be achieved.

Although the embodiments of the present invention have been described in detail above, these are literal examples, and the present invention should not be construed as being limited to these specific examples.

For example, the concave groove forming the orifice passage may be formed along the opening peripheral edge of the second pocket portion along the opening peripheral edge of the second window portion of the second pocket portion. The shape, length, etc. are appropriately changed depending on the vibration-proof characteristics required for the mount.

Further, in the above-mentioned embodiment, a concrete example of the present invention applied to an engine mount for an automobile is shown. However, the present invention is also applicable to a body mount or a differential mount for an automobile, or a fluid in various devices other than an automobile. Any of them can be advantageously applied to the encapsulated tubular mount.

Although not listed one by one, the present invention is
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.

In the present invention, the following aspects can be appropriately combined and employed.

That is, first, the seal sleeve is provided with the first window portion and the second window portion, and the first and second pocket portions are opened to the outer peripheral surface through the window portions, respectively, while the second pocket portion is opened. The opening edge portion of the second window portion is axially separated from the opening edge portion of the second window portion, and a concave groove extending in the circumferential direction is formed on the outer peripheral surface of the rubber elastic body located between the both opening edge portions, One side of the concave groove is connected to the first pocket portion through the connecting groove provided on the outer peripheral surface of the seal sleeve, and the other side of the concave groove is connected to the second pocket portion. It is possible to form the orifice passage by covering the concave groove and the connection groove with the outer cylinder member.

In the fluid-filled type cylindrical mount having such a structure, the concave groove forming the orifice passage is
Since it is formed on the side of the equilibrium chamber, the length of the orifice passage can be set longer, the degree of freedom in tuning the orifice passage is improved, and the vibration isolation effect based on the fluid flow action can be advantageously obtained. Is possible.

The concave groove forming the orifice passage is
Since it is formed in the window portion of the seal sleeve, there is no need to reduce the diameter of the axial center portion of the seal sleeve over the entire circumference in order to form the orifice passage. It is possible to stabilize the sealing property with the tubular member.

Moreover, the concave groove forming the orifice passage is located adjacent to the seal sleeve around the equilibrium chamber where the internal pressure change at the time of vibration input is kept low and the stress generated by the rubber elastic body forming the wall is small. Since the rubber elastic body forming the concave groove is advantageously prevented from being deformed and a stable passage cross-sectional area is secured, the desired vibration damping effect can be obtained advantageously. Of.

The orifice passage may be formed only on one side in the axial direction of the equilibrium chamber and formed with a predetermined length in the circumferential direction, but in the present invention, for example, the opening of the second pocket portion is formed. Both side portions in the circumferential direction of the portion are bias opening portions that are biased axially opposite to each other over a predetermined length in the circumferential direction, and both the bias opening portions are opposite to the opening edge portion of the second window portion. The first pocket portion and the second window portion are separated from each other in the axial direction and are connected to the connection grooves extending from the respective one end portions in the circumferential direction of the opening portion of the first pocket portion. By providing a pair of recessed grooves that extend in the circumferential direction between the axially separated portion and the other portion and are connected to the other biased opening portion, a pair of orifice passages are formed on both sides of the equilibrium chamber in the axial direction. It is also possible to form.

If such an orifice structure is adopted,
Since the pair of orifice passages can be formed with excellent space efficiency, the vibration damping effect based on the flow action of the fluid flowing in the orifice passages can be more effectively obtained.

Alternatively, in the present invention, the opening edge portion of the second pocket portion is also spaced from the opening edge portion of the second window portion in the circumferential direction, and the opening edge portions of the second pocket portions are positioned. And a concave groove is provided on the outer peripheral surface of the rubber elastic body located between the opening edge of the second window portion and the opening of the second pocket portion so as to extend in the circumferential direction by a length of half a circumference or more. Accordingly, it is possible to form the orifice passage so as to surround the equilibrium chamber with a half circumference or more.

As a result, the length of the orifice passage can be set longer than the circumferential length of the equilibrium chamber, and a greater degree of freedom in tuning the orifice passage can be ensured.

Further, the seal sleeve may be formed by cutting a tubular body made of a metal such as steel or the like into an appropriate length, but particularly in the present invention, the first window portion and the What is formed by abutting and welding a pair of arcuate plate-shaped half halves, each of which is divided by a dividing surface extending in the axial direction in a portion corresponding to the second window portion, is preferably used.

Here, since it is not necessary to provide a stepped portion or the like in the portions corresponding to the first window portion and the second window portion in the seal sleeve, stable welding work can be easily performed. . By adopting the seal sleeve formed by welding the pair of arcuate plate-shaped half halves in this manner, the manufacturing cost can be reduced.

[0050]

As is apparent from the above description, in the fluid-filled cylindrical mount having the structure according to the present invention, the stopper portions are provided at both sides in the mount axial direction, so that the equilibrium chamber is formed. It is possible to advantageously provide a mechanism for restricting the relative displacement amount of the support shaft member and the outer cylinder member in the radial direction by the stopper portion while sufficiently securing the space for forming the orifice passage and the orifice passage. Even when the relative displacement between the shaft member and the outer cylinder member is limited,
It is characterized in that the equilibrium chamber and the orifice passage are prevented from being deformed and the desired vibration damping effect can be stably exhibited.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a front view showing an inner tubular metal member forming the engine mount shown in FIG. 1.

FIG. 4 is a half sectional view of the inner tubular metal piece shown in FIG.

5 is a vertical cross-sectional view of a metal sleeve constituting the engine mount shown in FIG.

FIG. 6 is a right side view of FIG.

7 is a sectional view taken along line VII-VII in FIG.

8 is a vertical cross-sectional view showing an integrally vulcanized molded product that constitutes the engine mount shown in FIG.

9 is a sectional view taken along line IX-IX in FIG.

10 is a cross-sectional view taken along line XX in FIG.

FIG. 11 is a right side view of FIG. 9.

FIG. 12 is a top view of FIG. 9.

FIG. 13 is a bottom view of FIG.

FIG. 14 is a plan view showing an integrally vulcanized molded product constituting an engine mount as another embodiment of the present invention.

FIG. 15 is a bottom view of the integrally vulcanized molded product shown in FIG.

[Explanation of symbols]

10 engine mount 12 Inner tube fittings 14 Outer cylinder fittings 16 Rubber elastic body 22 Stopper 24 metal sleeve 26 First Window 28 Second window 42 First pocket 44 Second pocket 52 biased opening 54 groove 56 Connection groove 64 Pressure chamber 66 equilibrium chamber 68 Orifice passage

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Claims (7)

(57) [Claims] 1. A first pocket portion which connects a support shaft member and a seal sleeve which is arranged at a predetermined distance so as to surround the support shaft member with a rubber elastic body and which opens to an outer peripheral surface through the seal sleeve. And a second pocket portion are provided, an outer cylinder member is fitted and fixed to the outer peripheral surface of the seal sleeve, and the opening of the first pocket portion is covered with the outer cylinder member. The portion is formed of the rubber elastic body to form a pressure receiving chamber into which vibration is input, and by covering the opening of the second pocket portion with the outer cylinder member, a part of the wall portion becomes thin. A variable volume equilibrium chamber composed of the rubber elastic body is formed, and an incompressible fluid is enclosed in the pressure receiving chamber and the equilibrium chamber, and an orifice passage communicating between the pressure receiving chamber and the equilibrium chamber is formed. Fluid-filled cylinder provided In type mount, the axial direction both side portions located to sandwich the equilibrium chamber in the axial direction, it is fixed to the side of the support shaft member, and faces the front <br/> Symbol sealing sleeve from support shaft member A load is applied to the equilibrium chamber and the orifice passage by projecting radially outward toward the side of the seal sleeve and abutting against the side of the seal sleeve.
A hard material that reduces or prevents double input while limiting the relative displacement of the support shaft member and the outer cylinder member in the direction perpendicular to the axis.
A fluid-filled cylindrical mount, characterized in that stopper parts formed of materials are provided respectively. 2. The fluid-filled tubular mount according to claim 1, wherein a seal rubber layer that covers the outer peripheral surface of the seal sleeve over substantially the entire surface is formed integrally with the rubber elastic body. 3. The rubber elastic body forming the wall portion of the second pocket portion is formed into a thin bag shape over the entire bottom wall portion and peripheral wall portion of the second pocket portion. The fluid-filled cylindrical mount according to claim 1 or 2. Wherein the projecting distal end face of the stopper portion, the fluid-filled cylindrical mount according to any one of claims 1 to 3 cushion rubber layer is formed. 5. The axially opposite sides of the equilibrium chamber.
Two of the stoppers that are located in the
Working member fixed on the outer peripheral surface of the central portion in the axial direction of the member
Is provided integrally with the member, and projects radially outward from the acting member.
The method according to any one of claims 1 to 4, wherein
Fluid-filled cylinder mount. 6. Located within the first pocket portion,
The umbrella portion that projects radially outward from the central portion of the bottom of the
Is provided integrally with the action member, and the outer peripheral surface of the umbrella portion and the first
A contract in which a constriction is formed between the inner peripheral surface of the pocket and
The fluid-filled tubular mount according to claim 5. 7. A bottom wall portion of the second pocket portion is formed.
The rubber elastic body that extends axially.
Are provided over substantially the entire surface of the bottom wall portion, and the bottom wall portion
It is easy to deform due to the thin wall
A fluid-filled cylindrical mau according to any one of claims 1 to 6.
I don't know.