JPH0925983A - Liquid-charged vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the big displacement of vibration control base body surely, eliminate any possibility of the stopper come off at the big displacement time, improve the characteristic in the perpendicular direction for an axis, especially a static spring constant and use it with durability commonly. SOLUTION: In a liquid-charged vibration control device combining a main body metal fitting 1 with an upper side installation metal fitting 3 through a vibration control base body 5 consisting of a rubber elastic body and having its inside charged with liquid, the upper side installation metal fitting 3 is formed in a turned-over bowl shape and its upper surface is adhered to the upper end of the vibration control base body 5 and its periphery side surface is crowned in a non-adhesion state and a ring shape stopper part 21 is formed by extending the outer periphery end part of this upper side installation metal fitting 3 outside. At the upward big displacement time of the vibration control base body 5 following the vibration, the stopper part 21 is constituted so that the main body metal fitting 1 may be extended upward and contacted to the inner flange 15 for the stopper formed on its upper end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device which is mainly used for vibration-damping a power unit such as an engine of an automobile or other vibration generators.

[0002]

2. Description of the Related Art As a liquid-filled type vibration damping device such as a mount for supporting a vibration generator such as an automobile engine so as not to transmit the vibration to the vehicle body, for example, as shown in FIG. The upper mounting metal fitting (53) fastened to the supporting side and the main body metal fitting (51) are coupled via a thick vibration damping base body (55) made of a rubber elastic body, and the vibration damping base body ( 55) and a diaphragm (57) facing each other are formed, and the inside thereof is formed as a liquid sealing chamber (58). The liquid sealing chamber (58) is divided into two liquid chambers (58a) (58a) by a partition member (59).
b), both chambers communicate with each other through the orifice (60), and both liquid chambers (58a) (58b) by the orifice (60)
There is known a liquid-filled type vibration-damping mount configured to fulfill a vibration damping function and a vibration insulating function by virtue of the liquid flow effect and the vibration damping effect of a vibration-damping base.

In the above apparatus, the upper mounting member (53) is usually fastened to a vibration generator such as an engine, and the vibration damping base (55) is largely displaced vertically due to the vibration of the engine or the like. Body fittings to regulate (51)
One part of a member such as a stabilizer which is provided with an overhanging portion (55a) of a vibration-proof substrate (55) in which a part of the protruding piece (51a) is embedded and which is jointly fastened to the upper mounting bracket (53) or fixed by welding means or the like. The portion is formed as a stopper that elastically abuts on the upper and lower sides of the overhanging portion (55a) when the amount of vertical movement (tensile and compression) displacement due to vibration is large, thereby preventing further displacement. Has become. Further, the characteristics in the direction perpendicular to the axis, particularly the static spring constant, are also borne by the separate member fixed to the upper mounting member as described above.

[0004]

However, the member fixed to the upper mounting member is supported in a cantilever manner, and a part of the vibration-proof substrate is formed so as to project, and the projecting portion and the member are stoppers in both up and down directions. Therefore, the supporting strength as a stopper is not sufficient, and there is a possibility that the stopper may come off during large displacement. Further, since the upper mounting member is usually in the shape of a flat plate, and the effect of suppressing and reinforcing the lateral rubber deformation of the vibration-proof substrate can hardly be expected, there is a problem in durability. In particular, as shown in the figure, when the upper mounting bracket on the vibration generator side and the main body bracket on the supporting side are bent, the static spring constant in the direction perpendicular to the axis may be insufficient.

The present invention has been made in view of the above, and it is possible to reliably suppress large displacement of the vibration-proof base body, there is no risk of the stopper coming off at the time of large displacement, and the characteristics in the direction perpendicular to the axis, especially the static spring. An object of the present invention is to provide a liquid-filled type vibration damping device capable of improving the constant and achieving both durability.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a main body metal fitting having a tubular body and an upper mounting metal fitting via a vibration-proof base body made of a rubber elastic body. A diaphragm facing the anti-vibration substrate is arranged inside the body fitting to form a liquid-filled chamber that forms a part of the chamber wall, and the liquid-filled chamber is partitioned by an orifice into two liquid chambers that communicate with each other. In the liquid-filled type vibration damping device configured, the upper mounting member is formed in a shape of a bowl, and the upper surface portion is bonded to the upper end portion of the vibration damping base, and the peripheral side surface portion is unbonded to be crowned, The outer peripheral end of the upper mounting member is formed as an outwardly extending annular stopper portion, and when the vibration damping base body is largely displaced upward due to vibration, the stopper portion extends the body fitting upward. It is designed so that it abuts on the inner flange for the stopper formed on the upper end. Characterized in that by comprising.

According to a second aspect of the present invention, in the liquid-filled type vibration damping device, the stopper inner flange of the body metal fitting is abutted on the upper mounting bracket when the vibration damping base is largely displaced downward due to vibration. An annular stopper member that can contact is integrally fixed.

[0008]

With the liquid-filled type vibration damping device having the above-mentioned structure, the vibration generated by the vibration generator such as the supported engine causes
The anti-vibration base made of a rubber elastic body is vertically displaced with respect to the main body metal fitting on the fixed side, but at this time, when a large upward displacement of the anti-vibration base is provided, it is integrally provided with the upper mounting metal fitting capped on its upper end. The stopper portion abuts on the stopper inner flange formed by extending the body metal fitting upward, and further upward displacement is suppressed. Moreover, the stopper part
The stopper does not come off because it has an annular shape and can come into contact with the stopper inner flange over the entire circumference.

Further, the upper mounting member is in the shape of a bowl and is covered with the upper end portion of the vibration-proof base body so as to cover the upper portion, and the peripheral side surface portion has a large contact surface. It is possible to suppress excessive bending deformation of the upper end portion of the vibration-proof base body in the direction perpendicular to the axis by the upper mounting member. Moreover, the upper mounting metal fitting, which is in the shape of a bowl, is adhered to the anti-vibration substrate on the upper surface portion, but is not adhered to the anti-vibration substrate on the peripheral side surface portion. (Stretching deformation) can be reasonably tolerated and has excellent durability.

According to a second aspect of the present invention, by providing an annular stopper member integrally fixed on the upper mounting member, the stopper member serves as the stopper for a large downward displacement due to vibration. It is possible to make contact with the inner flange over the entire circumference, so that downward displacement above a certain level can be reliably suppressed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

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

In the figure, (1) is a bottomed main body metal fitting which also serves as a case having a tubular body portion, and a mounting bolt (2) is projectingly provided on the bottom portion (11). (3) is an upper mounting member having a mounting bolt (4) fixed by press fitting or welding. Either one of the two mounting members, mainly the upper mounting member (3), is fastened to the vibration generator side of the automobile engine or the like. Further, the main body metal fitting (1) is used by being fastened to a support side such as a chassis of a vehicle body.

The main body metal fitting (1) has a lower body portion (12) continuous from the bottom portion (11) and an upper body portion (which has a slightly larger diameter) extending upward from the upper end thereof through a step portion (13). 14) consists of and. It is also possible to separately form the upper body portion (14) and the lower body portion (12) and combine them by caulking means or the like.

Reference numeral (5) is a thick vibration-proof base body made of a rubber elastic body interposed between the main body fitting (1) and the upper mounting fitting (3), and has a substantially umbrella shape as shown in the figure. At the same time, the upper mounting member (3) is attached to the upper end portion thereof at the same time as the vibration-proof base body (5) is vulcanized and capped, and the lower end portion of the upper mounting member (3) is attached to the lower body portion at the inner periphery of the main body fitting (1). It is attached so that it is located at the upper end of (12).

In the case of the figure, the lower end of the vibration-proof substrate (5) is vulcanized and adhered to the auxiliary metal fitting (6), and the extension (6a) from the annular base of the auxiliary metal fitting (6) is lowered. Body (1
2), the step portion (13) and the upper trunk portion (14) are fitted and attached to a part of the inner circumference. The extension portion (6a) of the auxiliary metal fitting (6) is extended at circumferentially equally spaced positions such as 180 ° facing each other (not shown), and the end portion is bent after vulcanization molding of rubber. To do. In addition, the extension (6a)
Can be formed in a ring shape.

At the upper end of the upper body portion (14) of the main body fitting (1), an inner flange (15) bent and extended inward is provided, and the auxiliary fitting (15) is provided by this inner flange (15). The removal of 6) is prevented, and the sealing performance is good and maintained reliably.

A diaphragm (7) made of a rubber film facing the antivibration base body (5) is attached to the inner circumference of the lower body portion (12) below the antivibration base body (5). A space surrounded by the vibration base body (5), the bottom portion (11) of the body fitting (1) including the diaphragm (7) and the lower body portion (12) is formed as a liquid filling chamber (8) filled with liquid. Has been done.

In the case of the figure, the diaphragm (7) is integrally formed with a tubular rubber portion (16) in which a tubular reinforcing metal member (9) is embedded and reinforced, and the tubular rubber portion (16) is formed. The reinforcing metal fitting (9) is provided so as to be fitted on the inner circumference of the lower body portion (12) and to be held at a fixed position by engaging with the step portion (13). Further, the vibration-proof base (5) is an auxiliary metal fitting (6).
Is attached to the inner circumference of the main body metal fitting (1) so as to maintain a sealed state via the tubular rubber portion (16).

The liquid filling chamber (8) inside has two diaphragm chambers (7) and two partitioning members (17) fitted in the inner circumference of the cylindrical rubber portion (16) integral with the diaphragm (7). (8
a) (8b), and both of these liquid chambers (8a) (8
b) is communicated via the orifice (18). The flow path of the orifice (18) consists of the lower body (12) and the reinforcing metal fitting (9).
Between the liquid chamber (8a) and the liquid chamber (8b) are made to spirally communicate with each other by being formed in a spiral shape in the tubular rubber portion (16) between the liquid chamber (8a) and the liquid chamber (8b).

Further, the diaphragm (7) and the partition member (17)
The space between and is formed as an air chamber (20) in which air is enclosed, and a diaphragm (7) is provided so as to be able to bulge and deform. It is desirable that the diaphragm (7) is integrally formed with the tubular rubber portion (16) as shown in the figure.

Since the bottom portion (11) of the body fitting (1) forms a part of the chamber wall of the liquid chamber (8b), the mounting bolt (2) is attached to the body fitting (1). The bottom part (11) is provided with a press-fitting means or a combination of the press-fitting means and an adhesive so as to surely maintain an airtight state.

The upper mounting member (3) is formed in the shape of a bowl corresponding to the shape of the upper end portion of the vibration isolating base (5), and the upper surface portion (3a) is formed with respect to the upper end portion of the vibration isolating base (5). Are vulcanized and adhered to each other, and the peripheral side surface portion (3b) is unadhered to be capped and integrated.

Further, the outer peripheral end of the upper mounting member (3) is extended outward to be integrally formed as an annular stopper portion (21), and the main body fitting (above the stopper portion (21) extends upward. The inner flange (15) at the upper end of 1) is formed as a stopper, and the stopper portion (21) causes the inner flange (15) for the stopper when the vibration damping base body (1) is largely displaced upward due to vibration. It comes into contact with 15) over the entire circumference. The stopper portion (21) is provided with an elastic body (22) such as rubber for absorbing the impact at the time of contact with the stopper inner flange (15).

Reference numeral (23) is a stopper member fixed to the upper surface of the upper mounting member (3) by means such as screw fastening, and has a disk shape having a hole through which the mounting bolt (4) penetrates in the center. The metal plate (24) is provided with a rubber cover (25) whose outer peripheral portion extends axially downward in a skirt shape and is attached to the lower side of the upper mounting bracket (3) due to vibration. When the metal plate (24) is largely displaced, the outer peripheral end portion of the metal plate (24) is provided so as to contact the upper surface of the inner flange (15) for the stopper via the rubber cover (25). By attaching the rubber cover (25) as shown in the figure, the impact at the time of contact can be mitigated, and the skirt-shaped part (25a) on the outer periphery of the rubber cover (25) serves as a protective cover for the entire vibration isolator. It will play a role.

In the above embodiment, the mounting bolt (2) is provided on the body fitting (1) in a protruding manner. However, in addition to this, a bracket is attached to the outer circumference of the tubular body of the body fitting (1) to support the support side. It can also be provided so as to be fastened to. Further, as the main body metal fitting (1), a bowl-shaped metal fitting also serving as a separately formed bottom portion may be attached to the lower end portion of the tubular body portion by caulking means or the like to be integrated.

Further, the upper body portion (14) is omitted and, for example, FIG.
As shown in FIG. 3 and FIG. 3, the auxiliary metal fitting (6) obtained by vulcanizing and bonding the lower end of the vibration-proof base (5) is attached to the tubular body (1) of the main metal fitting (1).
It is also possible to provide a tubular metal fitting (30) which also serves as a stopper and is crimped together with the upper end of (0), and to form an inner flange (15) for the stopper at the upper end of the metal fitting (30).

Further, as in the embodiment shown in FIG. 3, an air chamber (20) is formed between the bottom portion (11) of the main body fitting (1) and the diaphragm (7), and the diaphragm (7) and the partition member. A liquid chamber (8b) communicating with the liquid chamber (8a) through an orifice (18) formed by a groove provided on the outer circumference of the partition member (17) may be formed between the liquid chamber (17) and the partition member (17). Other configurations are similar to those of the above-described embodiment.

When the liquid-filled type vibration damping device having the above structure is in use, the mounting bolts (4) projecting from the upper mounting bracket (3) above the vibration damping base (5) are located on the vibration generator side. A power unit such as an engine is fastened and supported for use. At this time, the vibration-isolating base body (5) is usually slightly compressed and deformed by the bearing load of the engine and the upper mounting bracket (3) is The inner flange (15) for the stopper of the main body metal fitting (1) is located at a position slightly lower than the above state, that is, substantially in the middle of the stopper portion (21) and the upper stopper member (23).

The vibration damping base body (5) is deformed by the vibration of the engine and the two liquid chambers (8a) of the liquid filling chamber (8).
Due to the volume change of (8b), the liquid inside the orifice (1
8), the low frequency vibration is absorbed and attenuated by the flow resistance of the vibration isolating substrate (5) and the orifice (18) and the viscosity of the liquid, and the high frequency vibration is the resonance of the vibration isolating substrate (5) and the liquid itself. Vibration is reduced by being absorbed by the action.

At this time, the upper mounting member (3) vibrates vertically due to the vibration of the engine and the like while the vibration-proof substrate (5) expands and contracts. When the amount of displacement due to this vibration becomes large, for example, upward movement. At the time of large displacement, the stopper part (21) integrally formed with the upper mounting bracket (3) is an inner flange (15) for the stopper, which is a part of the main bracket (1).
And the further displacement is restricted. Therefore, excessive deformation of the anti-vibration substrate (5) and removal of the stopper can be prevented.

In particular, since the stopper portion (21) is provided on the entire circumference of the upper mounting member (3) as shown in the figure, the vibration-proof base body (5) is slightly laterally deformed or distorted. Also,
Since it can come into contact with the inner flange (15) in a wide range, it is possible to more reliably prevent the stopper from coming off or being deformed.

Further, at the time of a large downward displacement, the stopper member (23) provided on the upper surface of the upper mounting member (3) comes into contact with the inner flange (15) to prevent further displacement.

As a result, the displacement due to the vibration of the upper mounting member (3) in the vertical direction due to the vibration of the engine can be suppressed within a certain range.

Moreover, the upper mounting member (3) is in the shape of a bowl and has a large contact surface against the vibration-isolating base body at the peripheral side surface portion, and excessive movement of the upper end portion of the vibration-isolating base body (5) in the direction perpendicular to the axis. And elastic deformation can be prevented, and the static spring constant in the direction perpendicular to the axis can be increased.

The inner diameter and depth of the bowl-shaped recess of the upper mounting member (3) can be changed irrespective of the gap between the stopper portion and the stopper inner flange and the length of the vibration-proof base.
Therefore, the vertical and horizontal static spring constants can be freely set.

[0037]

As described above, according to the liquid-filled type vibration damping device of the present invention, large displacement of the vibration damping substrate can be surely suppressed, there is no fear of the stopper coming off at the time of large displacement, and moreover, in the direction perpendicular to the axis. It is possible to improve the characteristics, in particular, the static spring constant, and to enhance the durability of the vibration-damping base body made of a rubber elastic body, thereby achieving both of these characteristics.

Moreover, since the stopper portion is formed integrally with the upper mounting member, it is not necessary to provide an overhanging portion serving as a stopper on a part of the vibration-proof base, and the manufacturing and provision can be performed at low cost.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a liquid filled type vibration damping device according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of another embodiment of the present invention.

FIG. 3 is a vertical sectional view of still another embodiment of the present invention.

FIG. 4 is a vertical sectional view showing an example of a conventional liquid-filled type vibration damping device.

[Explanation of symbols]

 (1) Body bracket (11) Bottom part (12) Lower body part (13) Step part (14) Upper body part (15) Inner flange for stopper (2) Mounting bolt (3) Upper mounting bracket (4) Mounting Bolt (5) Anti-vibration substrate (7) Diaphragm (8) Liquid filling chamber (16) Cylindrical rubber part (17) Partition member (18) Orifice (20) Air chamber (21) Stopper part (23) Stopper member ( 24) Metal plate (25) Rubber cover

Claims (2)

[Claims] 1. A main body metal fitting having a tubular body and an upper mounting metal fitting are coupled via a vibration isolating base made of a rubber elastic body, and a diaphragm facing the vibration isolating base is disposed inside the main body fitting. In the liquid-filled type vibration isolation device in which the liquid-filled chamber forming a part of the chamber wall is partitioned into two liquid chambers that communicate with each other by an orifice, The upper end of the vibration-proof base is adhered to the upper end of the vibration-isolating base, the peripheral side surface is not adhered, and the outer peripheral end of the upper mounting member is extended outward to form an annular stopper part. When the vibration damping base body is largely displaced upward due to vibration, the stopper portion extends upward from the main body metal fitting and comes into contact with the stopper inner flange formed at the upper end portion thereof. A liquid-filled type vibration damping device characterized in that 2. An annular stopper member is integrally fixed on the upper mounting member so as to come into contact with an inner flange for the stopper of the main body member when the vibration damping base body is largely displaced downward due to vibration. The liquid filled type vibration damping device according to claim 1.