JP2553360Y2 - Liquid-filled mount - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount for supporting a vibration body such as an engine of an automobile in a vibration-proof manner, and more particularly to a liquid-filled mount in which a liquid is sealed.

[0002]

2. Description of the Related Art Generally, in a vibrating body such as an engine of an automobile, various vibrations having different frequencies and amplitudes are generated according to the rotational state, that is, the number of rotations. There is a strong need for a mount that can effectively dampen a wide range of vibrations.

As a mount for attenuating such a wide range of vibration, for example, there is a mount (vibration isolator) disclosed in Japanese Patent Application Laid-Open No. 64-35138. This mount is, as shown in FIG. , The outer cylinder 23 is positioned outside the inner cylinder 22 at a predetermined interval,
23, an elastic body 24 at one end and a diaphragm 26 at the other end.
To form a hermetically sealed space between the two cylinders 22 and 23, and further provide a partition 27 in this space, and fill the liquid 33 between the partition 27 and the elastic body 24. The main liquid chamber 31 is formed with a sub liquid chamber 32 in which a liquid 33 is sealed between the partition wall 27 and the diaphragm 26, and a restriction passage 28 is formed in the partition wall 27 so that the main liquid chamber 31 can pass through the restriction passage 28. The main liquid chamber 31 and the sub liquid chamber 32 communicate with each other, and an elastic body 35 that absorbs a load in the torsion direction is inserted between the partition wall 27 and the inner cylinder 22. .

When vibration is input from the vibrating body via the inner cylinder 22 or the outer cylinder 23, the elastic body 2 on the main liquid chamber 31 side is input.
4 displaces and the volume in the main liquid chamber 31 changes,
Due to the change in the volume of the main liquid chamber 31, the liquid 33 in the main liquid chamber 31 flows into the restriction passage 28 of the partition wall 27, flows through the restriction passage 28, moves toward the sub liquid chamber 32, and The volume of the sub liquid chamber 32 is changed in accordance with the liquid 33 in the chamber 32 to displace the diaphragm 26 on the side of the sub liquid chamber 32, and the restoring force of the diaphragm 26 causes the liquid 33 in the sub liquid chamber 32 to move. Flows into the restriction passage 28 again, flows through the restriction passage 28 and moves to the main liquid chamber 31 side, and the main liquid chamber 31 and the sub liquid chamber 32
The input vibration is attenuated by the liquid column resonance when the liquid 33 moves between the two.

When a load in the twisting direction is input due to an impact from the road surface or the like, the elastic body 24 interposed between the inner cylinder 22 and the outer cylinder 23 and the partition wall 27 and the inner cylinder 22 Due to the elastic deformation of the interposed elastic body 35, the inner cylinder 2
2 and the outer cylinder 23 are relatively displaced in the torsion direction, thereby absorbing a load in the torsion direction, and
The generation of abnormal noise due to contact with the device is prevented.

[0006] However, such a mount as described above is excellent in absorptivity to a load in a twisting direction and attenuating to a vibration in a low frequency range, but does not have a function for attenuating vibration in a high frequency range. For this reason, there is a problem that vibration in a high frequency range is transmitted to a support such as a chassis via a mount.

On the other hand, there is a mount disclosed in US Pat. No. 4,795,140 which has solved the problem of attenuating vibrations in a high frequency range as described above. This mount is, as shown in FIG. A play mechanism 49 is displaceably provided on a partition wall 47 made of an elastic body which is divided into a main liquid chamber 41 and a sub liquid chamber 42.
An orifice 48 communicating between the main liquid chamber 41 and the sub liquid chamber 42 is formed at the center of the hole.

However, in such a mount, although the vibration in the high frequency range can be attenuated by the displacement of the play mechanism 49, the play mechanism 49 is formed as a separate member and is provided in the partition wall 47 made of an elastic material. Because it is displaceable,
The number of components as a whole increases, and the manufacture and installation of the play mechanism 49 takes time, resulting in a significant increase in manufacturing cost.

A main liquid chamber 41 is provided at the center of the play mechanism 49.
Since the orifice 48 is provided for communicating between the orifice 48 and the auxiliary liquid chamber 42, the shape and dimensions of the orifice 48
9 is naturally determined by the shape and size of the orifice 9, so that the diameter of the orifice 48 cannot be increased,
There is a problem that the damping property against vibration in a low frequency range is inferior.

This invention solves the above-mentioned problems of the prior art, and can exhibit excellent damping properties in a wide range of vibrations from low frequencies to high frequencies, and can also withstand loads in the twisting direction. It is an object of the present invention to provide a liquid-filled mount that is excellent in absorptivity and has no possibility of generating abnormal noise even when a load in the twisting direction is input.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to dispose the outer cylinder at a predetermined interval outside the inner cylinder, and to set the outer cylinder between the inner cylinder and the outer cylinder. One end is made of an elastic body, and the other end is integrally connected with a diaphragm to form a hermetically sealed space between the two cylinders. In this space, an orifice communicating from the upper surface to the lower surface and a central hole are formed. A perforated partition wall is provided in a state where the inner cylinder penetrates the center hole thereof, and a main liquid chamber filled with liquid between the partition wall and the elastic body is provided between the partition wall and the diaphragm. Sub-liquid chambers each containing a liquid are formed, and the two liquid chambers communicate with each other through the orifice.Furthermore, at an appropriate portion of the elastic body facing the main liquid chamber, in the direction of the partition wall. A protruding annular sub-diaphragm is provided integrally, and the tip of this sub-diaphragm is Abuts on the upper surface of the partition wall in a state surrounding the central hole to bring the outer peripheral surface of the sub-diaphragm into contact with the liquid in the main liquid chamber, and the inner peripheral surface of the sub-diaphragm with the liquid in the sub-liquid chamber. In some cases, a means of contact is adopted.

[0012]

According to the present invention, when the vibration in the low frequency range is input, the elastic body is displaced by the vibration and the volume in the main liquid chamber is reduced, and the volume in the main liquid chamber is reduced. The liquid flows into the orifice, flows through the orifice, moves to the sub liquid chamber side, is combined with the liquid in the sub liquid chamber, increases the volume of the sub liquid chamber, and displaces the diaphragm below the sub liquid chamber. Then, the liquid in the sub liquid chamber flows into the orifice again due to the restoring force of the diaphragm, flows through the orifice and moves to the main liquid chamber side, and between the main liquid chamber and the sub liquid chamber through such an orifice. Due to the liquid column resonance when the liquids move, the vibration in the low frequency range is attenuated.

When vibrations in a high frequency range are input, the annular sub-diaphragm formed at the portion of the elastic body facing the main liquid chamber vibrates finely due to the vibration, and the fine vibration of the sub-diaphragm is transmitted to the main liquid chamber. By transmitting the liquid to the liquid in the room or the liquid in the sub liquid chamber, the vibration in the high frequency range is attenuated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 and 2 show an embodiment of a liquid-filled mount according to the present invention. FIG. 1 is a plan view, and FIG. 2 is a longitudinal sectional view of the one shown in FIG.

That is, the liquid-filled mount 1 is
The outer cylinder 3 connected to the support or the vibrator is located at a predetermined interval outside the inner cylinder 2 connected to the vibrator or the support that supports the vibrator. 3 is integrally connected with an elastic body 4 at one end and a diaphragm 6 at the other end to form a sealed space, and a spiral orifice 8 communicating from the upper surface to the lower surface is formed in the space. And a disk-shaped partition wall 7 having a central hole 9 formed therein, in a state where the inner cylinder 2 penetrates the central hole 9, and a liquid 13 is sealed on the upper surface side of the partition wall 7. The liquid chamber 11 is a sub liquid chamber 1 in which the liquid 13 is sealed on the lower surface side of the partition 7.
The two liquid chambers 11 and 12 are formed so as to communicate with each other via the orifice 8.

The outer peripheral surface of the partition 7 is fitted to the inner peripheral surface of the outer cylinder 3 and the main liquid chamber 11 of the central hole 9 is formed.
The opening on the side is formed in an annular concave portion 10 having a larger diameter than the central hole 9.

A sub-diaphragm 5 is formed integrally with the elastic member 4 on the inner peripheral side thereof facing the main liquid chamber 11 so as to protrude annularly in the direction of the partition wall 7. Is the concave portion 1 of the central hole 9 of the partition wall 7.
The sub-diaphragm 5 contacts the bottom surface of the sub-diaphragm 5 with a predetermined force, the outer peripheral surface of the sub-diaphragm 5 contacts the liquid 13 in the main liquid chamber 11, and the inner peripheral surface of the sub-diaphragm 5 passes through the central hole 9 of the partition 7. It is in contact with the liquid 13 in the chamber 12.

Reference numeral 14 denotes a reinforcing ring on the inner peripheral side of the diaphragm 6, and 15 denotes a reinforcing ring on the outer peripheral side of the diaphragm 6.

Next, the operation of the above-described device will be described. First, the liquid-filled mount 1 configured as described above
Is connected to the engine side which is a vibrating body, and the outer cylinder 3 is connected to the chassis side which is a supporting body for supporting the vibrating body.
When vibration is input to the inner cylinder 2 from the vibration body side, the vibration causes the elastic body 4 surrounding the main liquid chamber 11 to be elastically deformed, so that the vibration is attenuated or absorbed.

When the vibrating body is an automobile engine, various vibrations are generated according to the number of revolutions of the engine. For example, when the input vibration is a vibration in a low frequency range, Can not be absorbed only by the elastic deformation of the elastic body 4, and the liquid 13 moves between the main liquid chamber 11 and the sub liquid chamber 12 via the orifice 8 and the elastic deformation of the elastic body 4. Attenuation is caused by the liquid column resonance action.

That is, when the elastic body 4 is displaced by the vibration in the low frequency range, the volume in the main liquid chamber 11 is reduced, the internal pressure in the main liquid chamber 11 is increased, and the liquid 13 in the main liquid chamber 11 is separated from the partition wall 7. Flows into the orifice 8, flows through the orifice 8 and moves to the sub liquid chamber 12 side, and the liquid 13 in the sub liquid chamber 12
Accordingly, the volume in the auxiliary liquid chamber 12 is increased, and the diaphragm 6 located below the auxiliary liquid chamber 12 is displaced downward in the figure.

Then, the liquid 13 in the sub liquid chamber 12 flows into the orifice 8 of the partition wall 7 again by the restoring force of the diaphragm 6, flows through the orifice 8 and moves to the main liquid chamber 11, and the orifice 8 The vibration in the low frequency range is attenuated by the liquid column resonance effect when the liquid 13 moves between the main liquid chamber 11 and the sub liquid chamber 12 via the liquid column.

On the other hand, when vibrations in a high frequency range are input, the vibrations cause the sub-diaphragm 5 formed integrally with the elastic body 4 to vibrate slightly, and the micro-vibration of the sub-diaphragm 5 is applied to the liquid in the main liquid chamber 11. 13 and liquid 1 in sub liquid chamber 12
3, the vibration in the high frequency range is attenuated.

Further, when a load in the prying direction is applied due to an impact from the road surface or the like, the inner cylinder 2 and the outer cylinder 3 are relatively displaced in the prying direction via the elastic body 4, so that the prying in the prying direction is performed. In this case, even if the inner cylinder 2 and the outer cylinder 3 are relatively displaced in the twisting direction, a central hole 9 having a larger diameter than the inner cylinder 2 is formed in the center of the partition wall 7. The inner tube 2 and the outer tube 3 are provided by the central hole 9.
Since the relative displacement in the torsion direction is allowed, the load in the torsion direction can be sufficiently absorbed, and the partition wall 7 comes into contact with the inner cylinder 2 to generate abnormal noise. Will be gone.

As described above, in the liquid-sealed mount 1 according to this embodiment, the liquid between the main liquid chamber 11 and the sub liquid chamber 12 through the orifice 8 is protected against vibration in the low frequency range. By using the liquid column resonance effect when the members 13 move with each other, the elastic member 4 is prevented from vibrating in a high frequency range.
When the sub-diaphragm 5 integrally formed with the sub-diaphragm vibrates finely, it can effectively attenuate a wide range of vibrations from low frequency to high frequency.

When a load in the twisting direction is applied, the inner cylinder 2 is formed by a central hole 9 formed in the center of the partition wall 7.
The relative displacement of the outer cylinder 3 in the prying direction via the elastic body 4 is allowed, so that the load in the prying direction can be sufficiently absorbed and the partition wall 7 and the inner cylinder 2 are formed by the central hole 9. Can be prevented from contacting with each other, so that generation of abnormal noise can also be prevented.

The sub-diaphragm 5 is of a simple shape integrally formed on the inner peripheral side of the elastic body 4 facing the main liquid chamber 11, so that the manufacture of the sub-diaphragm 5 becomes easy. In addition, the number of parts as a whole can be reduced, whereby the manufacturing cost can be significantly reduced.

[0028]

According to the present invention, as described above, the elastic body surrounding the main liquid chamber is elastically deformed against the vibration in the low frequency range, and the liquid in the main liquid chamber is displaced by the orifice of the partition. The sub-liquid chamber moves through the sub-liquid chamber to change the volume in the sub-liquid chamber in accordance with the liquid in the sub-liquid chamber, and the change in the volume in the sub-liquid chamber displaces the diaphragm on the sub-liquid chamber side. The liquid column resonance in which the liquid in the sub liquid chamber moves to the main liquid chamber side again through the orifice due to the restoring force of the diaphragm, and the liquid moves between the main liquid chamber and the sub liquid chamber through such an orifice By the action, the vibration of low frequency and large amplitude is attenuated, and the vibration in the high frequency range is attenuated by the sub-diaphragm formed integrally with the elastic body. Can be attenuated It becomes, thereby, will be able to exhibit excellent damping properties over a wide range of vibrations from low frequency to high frequency.

Further, when a load in the twisting direction acts, the inner cylinder and the outer cylinder are relatively displaced in the twisting direction via the elastic body, so that the load can be absorbed. The center hole of the partition wall allows the relative displacement in the twisting direction between the inner cylinder and the outer cylinder to be sufficiently allowed, so that there is no danger that the partition wall will contact the inner cylinder and generate abnormal noise. become.

Further, since the shape of the sub-diaphragm formed integrally with the portion of the elastic body facing the main liquid chamber is simple, the manufacture of the sub-diaphragm becomes easy and the number of parts is reduced. Thus, the manufacturing cost can be significantly reduced, and an inexpensive product can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a liquid-filled mount according to the present invention.

FIG. 2 is a longitudinal sectional view of the one shown in FIG.

FIG. 3 is a cross-sectional view showing a liquid-filled mount according to a conventional example.

FIG. 4 is a sectional view showing a liquid-filled mount according to another example of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liquid-filled mount 2, 22 ... Inner cylinder 3, 23 ... Outer cylinder 4, 24, 35 ... Elastic body 5 ... Subdiaphragm 6, 26 ... Diaphragm 7, 27, 47 ... Partition wall 8 , 48 ... orifice 9 ... central hole 10 ... concave part 11, 31, 41 ... main liquid chamber 12, 32, 42 ... sub liquid chamber 13, 33 ... liquid 14, 15 ... reinforcing ring 28 ... Restricted passage 49: rattling mechanism

Claims (1)

(57) [Scope of request for utility model registration] An outer cylinder (3) is positioned outside the inner cylinder (2) at a predetermined interval, and one end between the inner cylinder (2) and the outer cylinder (3) is connected to an elastic body (4). ), The other end is integrally connected by a diaphragm (6) to form a sealed space between the two cylinders (2) and (3), and an orifice communicating from the upper surface to the lower surface is formed in the space. (8) and a partition wall (7) having a central hole (9) formed therein in a state where the inner cylinder (2) penetrates the central hole (9). The main liquid chamber (11) in which the liquid (13) is sealed between the elastic body (4) and the sub liquid chamber (11) in which the liquid (13) is sealed between the partition wall (7) and the diaphragm (6). 12) are respectively formed, and the two liquid chambers (11) and (12) communicate with each other via the orifice (8). Further, the main liquid chamber (1) of the elastic body (4) is formed. An annular sub-diaphragm (5) protruding in the direction of the partition wall (7) is integrally provided at an appropriate portion facing 1), and the front end of the sub-diaphragm (5) is connected to the central hole (9). In the enclosed state, the sub-diaphragm (5) is brought into contact with the upper surface of the partition (7) to bring the outer peripheral surface of the sub-diaphragm (5) into contact with the liquid (13) in the main liquid chamber (11). The inner peripheral surface is
2) A liquid-encapsulated mount, characterized in that it is configured to be brought into contact with the liquid (13) in the liquid.