JPH09329180A - Liquid seal-type flexible mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the static spring constant without increasing the dynamic spring constant, to reduce the flexible deformation of a vibration proof base, particularly that downward, to improve the durability by reducing the creep amount by the flexible deformation, and to reduce the influence to the stopper clearance. SOLUTION: In a two chamber liquid seal-type flexible mount, a cylindrical hardware 2 and a fitting 9 are connected through a vibration proof base 3 of a rubber elastic material, a diaphragm 4 of a rubber film, and a partition member 5 located inside of the diaphragm are respectively fixed at an opening side in opposition to the vibration proof base, of the cylindrical hardware 2 in the sealed condition, the inner chamber between the vibration proof base 3 and the diaphragm 4, has the partition structure formed by two liquid chambers 7, 8, and the both liquid chambers 7, 8 are connected by an orifice path 6 installed on the partition member 5. A step face 3a of a peripheral part of the inner face of the vibration proof base 3, and that 5a of a peripheral part of a side face in opposition to the vibration proof base 3, of the partition member 5, are kept into contact with each other without adhesion, to prevent the downward flexible deformation of the vibration proof base 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled anti-vibration mount which is mainly used to support a vibration generator such as an automobile engine in a vibration-proof manner.

[0002]

2. Description of the Related Art As a liquid-filled type vibration-proof mount for supporting a vibration-generating body such as an automobile engine so as not to transmit the vibration to the vehicle body, it has various structures. Is proposed.

For example, as shown in FIG. 3, a tubular metal fitting (52)
The vibration-proof base (5
3), and at the same time, the diaphragm (54) made of a rubber film and the partition (55) located inside the diaphragm (54) are fixed in a sealed state on the opening end side of the tubular metal fitting (52) facing the vibration isolating base. , The inner chamber between the vibration-proof substrate (53) and the diaphragm (54) is partitioned into two liquid chambers (57) and (58), and both liquid chambers (57) and (58) are provided in the partition body (55). A two-chamber liquid-filled type vibration-damping mount configured to perform vibration damping function and vibration insulation function by communicating with the orifice passage (56) is there. Reference numeral (51) is a tubular main body fitting that holds the tubular fitting (52), and the main body fitting (51) may be formed integrally with the tubular fitting.

When the anti-vibration mount having such a structure is used to support an automobile engine, the upper mounting bracket (59) is usually used by being fastened to a bracket on the engine side.

In this use, the antivibration base body (53) is bent under the load of the engine or the like. However, the antivibration base body (53) is fixed to the tubular fitting (52) as described above. If the vibration isolation base body (53) is provided with a required space between it and the partition body (55), the vibration damping base body (53) is flexibly deformed in the entire inner part of the tubular metal fitting (52).

Therefore, there is a problem that the amount of bending when receiving the load becomes large, and the creep amount of the vibration-proof base body (53) due to the bending deformation becomes large accordingly, and sufficient durability cannot be obtained.

Further, in this type of vibration proof mount, in order to prevent large displacement in the vertical direction due to vibration of the engine or the like, the upper mounting metal fitting (59) and the main body metal fitting (51) fixed to the body frame side. ) And a stopper that abuts when the amount of displacement due to vibration is large.

For example, in the case of FIG. 3, the upper fitting (5
A protrusion (59a) covered with a rubber layer integral with the vibration-isolating base (53) is provided in a part of 9), and the inner end (51a) of the upward extension of the body fitting (51) is provided. , When the amount of upward displacement due to vibration is large, the protrusion (59a) is formed as a stopper that elastically abuts (usually has a clearance), thereby preventing further displacement. There is.

Usually, in such an anti-vibration mount, it is set so as to have a substantially constant stopper clearance for an approximately constant load according to the static spring constant of the anti-vibration substrate. When the bearings are supported by a plurality of mounts, the shared load varies depending on the location where the mount is used, and the unevenness of the shared load causes uneven stopper clearances between mounts, leading to the generation of hammering noise.

On the other hand, increasing the static spring constant of the rubber elastic body itself which constitutes the vibration-proof base also increases the dynamic spring constant, and the spring characteristics change greatly, resulting in the expected vibration-preventing effect. Is not obtained, which is not preferable.

The present invention has been made in view of the above, and it is possible to increase the static spring constant without increasing the dynamic spring constant, and to reduce the flexural deformation of the vibration-proof substrate, particularly the downward flexural deformation. The purpose of the present invention is to reduce the amount of creep due to flexural deformation, improve durability, and reduce the influence on the stopper clearance.

[0012]

SUMMARY OF THE INVENTION According to the present invention, a cylindrical metal fitting and a mounting metal fitting are connected via a vibration isolating base made of a rubber elastic body, and an opening in the tubular metal fitting facing the vibration isolating base. A diaphragm made of a rubber film on the side and a partition located inside it are fixed in a sealed state, and the inner chamber between the vibration-proof base and the diaphragm is partitioned into two liquid chambers. In a two-chamber liquid-filled type vibration-damping mount, which is communicated with an orifice passage provided in the partition, a peripheral portion of the inner surface of the vibration-isolating base and a side of the peripheral portion of the partition facing the vibration-isolating base. It is characterized in that it is provided in contact with the surface.

According to this liquid-filled type vibration-damping mount, since the peripheral edge of the vibration-damping base is in contact with the peripheral edge of the partition body, the flexural deformation of the vibration-damping base due to the bearing load of the engine or the like is suppressed. . Moreover, since the flexural deformation is small and the static spring constant is high, when this is used to support the engine, even if the shared load is different for each of the multiple mounts, the difference in the stopper clearance is small. Has little effect.

In the above, the auxiliary metal fittings provided on the peripheral edge of the diaphragm are fitted to the inner periphery of the opening of the tubular metal fitting so as to be in contact with the side surface of the partition body facing the diaphragm,
It is preferable that the end of the tubular metal member is fixed to the tubular metal member together with the partition by caulking means.

With this structure, the partition body is sandwiched between the auxiliary metal fitting on the peripheral edge of the diaphragm and the peripheral edge of the vibration-proof base body, and the tubular metal fitting has a simple tubular shape. Even if it is, it is stably held at a predetermined position. Moreover, the load applied to the vibration-proof base can be supported by the contact portion of the partition body at the peripheral edge, and the above-described effect of suppressing the bending can be sufficiently exerted.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a liquid filled type vibration damping mount according to the present invention, in which an engine is provided at the upper opening side of a tubular metal fitting (2) fitted to a tubular main metal fitting (1). The vibration-damping (3) made of a rubber elastic body that receives the load of is adhered in a sealed state by vulcanization molding means and integrally fixed,
An upper mounting member (9) is embedded and fixed to the vibration-proof substrate (3) by vulcanization molding means. That is, the tubular metal fitting (2) and the mounting metal fitting (9) are connected via the vibration-proof base body (3).

Further, a diaphragm (4) made of a rubber film and a partition body (5) located inside the diaphragm (4) facing the antivibration base body (3) are sealed at the lower opening side of the tubular metal fitting (2). Is attached to. Thus, the inner chamber between the vibration-proof base body (3) and the diaphragm (4) is formed by the partition body (5) having the orifice passage (6) on the outer circumference, so that the vibration-proof base body (3) forms a part of the chamber wall. The first liquid chamber (7) and the diaphragm (4) are partitioned into a second liquid chamber (8) forming a part of the chamber wall, and the both liquid chambers (7) and (8) are divided into orifices (6). ) Is connected by. The communication ports to both liquid chambers are not shown. This constitutes a two-chamber liquid-filled type vibration isolation mount.

The upper mounting member (9) is provided with a screwing hole (9a) for connecting a mounting bolt. Usually, one of the main body metal fitting (1) to which the tubular metal fitting (2) is fitted and the mounting metal fitting (9), for example, the mounting metal fitting (9), is fixed to a bracket on the vibration generator side of an automobile engine or the like. The main body metal fitting (1) is used by being fixed to a support side of a vehicle body chassis or the like. The body fitting (1) is provided with a stay (not shown) for attachment if necessary.

The partition body (5) and the diaphragm (4) are, as shown in the figure, a partition body (5) having a groove as an orifice passage (6) in the peripheral edge portion and the peripheral edge portion of the diaphragm (4). The auxiliary metal fitting (4a) included in the tubular metal fitting (4a) is fitted to the inner circumference of the opening of the tubular metal fitting (2), and the tubular metal fitting (2) is caulked by an end edge (2a) of the tubular metal fitting (2). It is firmly attached to it.

In the present invention, the step surface (3a) substantially perpendicular to the mount axis is formed on the inner surface of the vibration-proof substrate (3), that is, the peripheral portion of the surface on the first liquid chamber (7) side. In addition, the anti-vibration base body (3) and the facing side step surface (5a) at the peripheral edge portion of the partition body (5) facing the partition body (5) are provided in contact with each other without adhering.

The step surface (5a) on the side of the peripheral edge of the partition body (5) facing the anti-vibration substrate is formed so as to be wider than the step surface (3a) and substantially perpendicular to the axis. , The step surfaces (3a) and (5a) contact each other without being adhered to each other, and the inner surface continuing from the step surface (3a) of the vibration-isolating base (3) and the step surface (5a) of the partition body (5) It has a gap between them. As a result, the flexural deformation of the vibration-proof substrate (3) toward the partition body (5) is restricted by the contact portion between the step surfaces (3a) and (5a).

In the case of the illustrated embodiment, the central portion of the partition body (5) is elastically deformable by the rubber film (5b) to increase the spring constant in the low frequency range.

Further, a rubber seal layer (3b) integral with the vibration-proof substrate (3) is attached to the fitting portions of the partition body (5) in the tubular metal fitting (2) and the auxiliary metal fitting (4a) of the diaphragm (4).
Is provided, whereby the partition body (5) and the auxiliary metal fitting (4a) are held and attached in a sealed state. Further, in the diaphragm (4), a part of the rubber film covers the outside of the auxiliary metal fitting (4a), and the rubber film layer (4b) has a sealing action with the partition body (5). It is ready to serve.

Although not shown, a cover (not shown) for covering the outside of the diaphragm (4) is integrally attached to the tubular metal fitting (2) to form an air chamber outside the diaphragm (4). In some cases.

Further, as a stopper mechanism for the above-mentioned vibration-proof mount, a part of the upper mounting member (9) is projected in a brim shape so that the brim-shaped portion (9a) is integrated with the vibration-proof base body (3). It is covered with a rubber layer to form a stopper protrusion (10). On the other hand, the upper end of the main body metal fitting (1) is extended upward, and slightly inward of the stopper protrusion (10). By bending, the inner peripheral end (11) is formed as a stopper with which the protrusion (10) elastically abuts when the amount of upward displacement due to the vibration of the mounting bracket (9) is large. This prevents further displacement.

In the figure, the stopper protrusion (10) and the inner peripheral end (11) are in contact with each other, but in normal use, the stopper protrusion is caused by the bearing load of the engine or the like. A predetermined clearance is held between the (10) and the inner peripheral end (11).

In the figure, (12) is a stopper member which is fixed to the upper mounting member (9) and also serves as a cover. The stopper member (12) has a thick plate portion (12a) at the center elastically attached to the inner peripheral end portion (11) of the main body metal fitting (1) when the mounting metal fitting (9) is largely displaced downward. By making contact with it, it is possible to prevent further flexural deformation. Also, with respect to the rolling action, it is excessive by making the outer peripheral skirt-like part (12b) contact the extension part of the body fitting (1). It is provided to regulate the rolling of the.

In the above-described vibration-proof mount, it is possible to omit the main body metal fitting (1) and make the tubular metal fitting (2) also serve as the main body metal fitting. In addition, the partition body (5)
It can also be formed by drawing from a steel plate, and in this case as well, it is preferable to provide a rubber plate in the central portion for implementation.

When the vibration-proof mount is used to support an automobile engine, for example, it is fixed to a support bracket for an engine or the like and a vehicle body frame by an upper mounting bracket (9) and a body bracket (1). Has been used. In this use, excellent vibration damping and vibration insulation are exhibited due to the liquid flow effect between the two liquid chambers (7) and (8) and the vibration damping effect of the vibration damping substrate (3).

Although the vibration-proof base body (3) is flexibly deformed by the bearing load of the engine or the like, the step-like surface (3a) of the inner peripheral surface of the vibration-proof base body (3) is the partition body (5). Since the stepped surface (5a) on the side of the liquid chamber (7) in the peripheral edge portion is in contact, the downward bending deformation is appropriately suppressed in the peripheral edge portion, and the static spring constant increases. That is, the amount of flexure decreases, and the amount of creep due to flexural deformation also decreases.

Therefore, when a plurality of vibration isolating mounts of the same type and of the same grade are used to support the engine, even if the shared load varies depending on the place of use, the bending due to the bearing load is suppressed as described above. As a result, the difference in the stopper clearance is also reduced, the influence on the setting of the stopper clearance is small, and the occurrence of tapping sound can be prevented.

Moreover, since the step surface (3a) of the vibration-proof substrate (3) and the step surface (5a) of the partition body (5) are in contact with each other without being bonded, the dynamic spring constant does not increase. It is possible to secure the same vibration isolation characteristics as the conventional one.

[0034]

As described above, according to the present invention, the static spring constant can be increased without increasing the dynamic spring constant, the flexural deformation of the vibration-proof substrate can be reduced, the creep amount can be reduced, and the durability can be improved. It is possible to improve the sex.

In particular, since the downward bending deformation can be suppressed appropriately, the impact on the stopper clearance is small even when the shared load is different, and the tapping noise can be prevented. In addition, the swing of the engine can be suppressed, and the steering stability can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a liquid filled type vibration damping mount according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a part of the above.

FIG. 3 illustrates a conventional liquid-filled type vibration isolation mount.

[Explanation of symbols]

 (1) Main body metal fittings (2) Cylindrical metal fittings (3) Anti-vibration substrate (3a) Step surface (4) Diaphragm (4a) Auxiliary metal fittings (5) Partition body (5a) Step surface (6) Orifice passageway (7) No. 1st liquid chamber (8) 2nd liquid chamber (9) Mounting bracket (10) Stopper protrusion (11) Inner peripheral end for stopper (12) Stopper member

Claims (2)

[Claims] 1. A tubular metal fitting and a mounting metal fitting are joined together via a vibration isolating base made of a rubber elastic body, and a diaphragm made of a rubber film is provided on the opening side of the tubular metal fitting facing the vibration isolating base, and the diaphragm. The partition bodies located on the inner side are fixed to each other in a sealed state, and the inner chamber between the vibration-proof base body and the diaphragm is partitioned into two liquid chambers, and both liquid chambers are communicated by the orifice passage provided in the partition body. In a two-chamber liquid-filled type vibration-damping mount, the peripheral portion of the inner surface of the vibration-damping base body and the surface of the peripheral portion of the partition body facing the vibration-damping base body are provided in contact with each other. Liquid-filled anti-vibration mount characterized by 2. A ring-shaped auxiliary metal fitting provided on a peripheral edge of a diaphragm is fitted to an inner periphery of an opening of a cylindrical metal fitting so as to be in contact with a side surface of the partition body facing the diaphragm, and The liquid-filled type vibration-proof mount according to claim 1, wherein the liquid-fitted vibration-proof mount is fixed to the tubular metal fitting together with the partition by caulking means at the edge of the metal fitting.