JPH07243471A - Liquid-sealed vibration control mount - Google Patents

Abstract

PURPOSE:To cause an air chamber to form a closed type by a method wherein the protection cover of the diaphragm of a liquid-sealed vibration insulation mount is reliably fixed with high sealing ability so as to prevent the occurrence of a slack and a backlash. CONSTITUTION:A vibration insulation base body 3 is mounted in a seal state in one opening part 2 of a body fitment l and a diaphragm 5 in the other opening part 4 to form a liquid chamber 6. The liquid chamber 6 is partitioned into a plurality of liquid chambers 6a and 6a, intercommunicated through an orifice 7, by means of a partition member 8. The protection cover 9 of the diaphragm 5 is attached in an opening part 4 in which the diaphragm 5 is mounted. The protection cover 9 has a peripheral edge part 9a fitted in the outer periphery of the opening part 4 through a rubber part 5a, and an extension part 21 from the body fitment l along the fitting-in part is securely caulked throughout a whole periphery in such a manner to fasten the peripheral edge part 9a.

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 mount used to support a vibration generator such as a vehicle engine or suspension in a vibration-proof manner.

[0002]

2. Description of the Related Art For example, as a vibration-proof mount for supporting a vibration generator such as an automobile engine so as not to transmit the vibration to a vehicle body, a vibration damping function is carried by a liquid enclosed in a liquid chamber of variable volume. The vibration isolation function is carried by a vibration isolation substrate made of a rubber elastic body that forms a chamber wall for liquid encapsulation, so that it has a large damping effect on low frequency vibration and high vibration insulation on high frequency vibration. Liquid filled type anti-vibration mounts are known.

FIG. 4 shows one of such liquid filled type vibration proof mounts.
The sectional view of the main part of an example is shown. In this vibration isolation mount, a vibration damping base (53) made of a rubber elastic body is provided in a lower opening (52) of a tubular body fitting (51), and a diaphragm (made of a rubber film) is provided in an upper opening (54). 55) are attached to each other in a sealed state to form a liquid chamber (56), and the liquid chamber (56) is partitioned by a partition member (58) having an orifice (57) to form both liquid chambers (56a). (5
6b) is communicated with the orifice (57), and the vibration damping function and the vibration isolation function are achieved by the liquid flow effect of both liquid chambers (56a) (56b) by the orifice (57) and the vibration damping effect of the vibration damping base (53). It is configured to fulfill.

The main part (A) of this anti-vibration mount is press-fitted and supported by a bowl-shaped bracket (not shown) to which the main body fitting (51) is fixed on the vehicle body side, and the anti-vibration base (53). The vibration generator side of the engine or the like is fixed to the hanging protrusion of the core metal fitting (61) that is embedded and fixed in, and the vibration generator is used in a suspended state.

In the above liquid filled type vibration isolation mount, a bowl-shaped protective cover (59) for protecting the diaphragm (55) is usually provided outside the upper diaphragm (55).
Although it is attached so as to form an air chamber (60) with 5), in the case of the above-mentioned hanging type, a means for attaching to the vehicle body, engine, etc. is not required in the cover portion. Therefore, the protective cover (59) made of synthetic resin material, etc.
Is used, the diaphragm (55) of the body fitting (51)
It is attached to the attached opening (54) by a simple engaging means by a convex portion.

That is, the diaphragm (55) is integrally attached to the opening (54) of the body fitting (51) by vulcanization molding, and the rubber portion (55a) thereof is attached to the opening (5).
It also turns to the outside of 4). Meanwhile, protective cover (59)
The convex portion (59b) is provided inside the peripheral portion (59a). And as shown in FIG. 5, the peripheral portion (59a)
Is elastically fitted to the outside of the rubber portion (55a), and the convex portion (59b) is attached to the end portion of the rubber portion (55a) by being locked.

[0007]

However, in the mounting structure of the above-mentioned protective cover (59), the peripheral edge (59) is used.
a) Since the convex portion (59b) on the inner circumference is only locked to the end portion of the rubber portion (55a), the fixing is not perfect, and looseness or backlash may occur due to vibration or the like when the vehicle is running, It may come off, and especially the sealing property of the mounting part is poor,
The air chamber (60) had to be of the atmospheric open type, and lacked versatility in the mount configuration.

Moreover, since the diaphragm is open to the atmosphere, the diaphragm comes into contact with the atmosphere and is easily affected by ozone, resulting in a problem in its durability.

The present invention has been made in view of the above, and a protective cover for a diaphragm in a liquid-filled type vibration-damping mount of this type can be securely and firmly attached and fixed without fear of loosening or rattling. A liquid-filled type vibration-proof mount capable of easily forming a closed chamber.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a vibration isolating base made of a rubber elastic body is provided in one opening of a cylindrical main body fitting, and a diaphragm made of a rubber film is provided in the other opening thereof in a sealed state. A liquid-filled type vibration-proof mount in which a liquid chamber is attached to form a liquid chamber, and the liquid chamber is partitioned by a partition member into a plurality of liquid chambers that communicate with each other through an orifice. In order to solve the above-mentioned problems, a structure in which a protective cover for a diaphragm is attached to the outside of the portion is configured as follows.

According to the first aspect of the present invention, the protective cover is fitted at its peripheral edge portion to the outer periphery of the opening to which the diaphragm is attached via the rubber portion of the diaphragm,
It is characterized in that an extending portion extending from the main body metal fitting along the fitting portion is caulked and fixed over the entire circumference so as to tighten the peripheral edge portion.

According to the second aspect of the invention, the opening of the main body metal fitting is formed by folding the end of the metal fitting outward and stacking it.
A diaphragm is attached so that the end edge side of the folded-back portion is an extending portion and the opening is buried, and the protective cover has a peripheral edge portion fitted to the outer periphery of the rubber portion of the diaphragm and the main body. It is characterized in that the extending portion from the folded-back portion of the metal fitting is caulked and fixed over the entire circumference so as to tighten the peripheral edge portion.

[0013]

According to the liquid-filled type vibration-proof mount of the present invention having the above-mentioned structure, the protective cover of the diaphragm attached to one opening of the body fitting has the rubber portion of the diaphragm around the opening of the body fitting. And is firmly and firmly fixed by caulking the extending portion from the main body metal fitting, and there is no fear of loosening, rattling, or coming off due to vibration or the like during traveling.

Moreover, the rubber portion of the diaphragm inside the protective cover serves as a sealing material, and the sealing property of this fixed portion is also good, and the air chamber between the protective cover and the diaphragm is of a hermetic type. Can be easily carried out, and the sealed state can be maintained well.

Particularly, as in claim 2, the opening of the main body metal fitting is formed by folding back the end of the metal fitting, and the end edge side of the folding back portion is an extension portion, and a protective cover is provided on the outer periphery of the rubber portion of this opening. When the extension portion is fitted and caulked and fixed by tightening, the opening portion is reinforced by the double structure, and the rubber portion of the diaphragm and the protective cover are provided together between the opening portion and the crimped extension portion. By being attached, the above-mentioned fixed state is further strengthened, and good sealing property is maintained.

[0016]

Embodiments of the present invention will now 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. The main part (A) of this anti-vibration mount has basically the same structure as that described in the description of the prior art, and one side of the cylindrical body fitting (1), for example, the lower opening as shown in the figure. A vibration damping substrate (3) made of a rubber elastic body is attached to the portion (2), and a diaphragm (5) made of a rubber film is attached to the opening (4) of the other upper portion in a sealed state, respectively. 6), the liquid chamber (6) is partitioned by a partition member (8) having an orifice (7), and both liquid chambers (6a) and (6b) are communicated by the orifice (7). .

A bowl-shaped protective cover (9) made of a synthetic resin material, a metal material or the like is provided on the outer side of the diaphragm (5).
As will be described later, it is attached to form an air chamber (10) between itself and the diaphragm (5). Further, a core metal fitting (11) is integrally embedded and fixed to the vibration isolating substrate (3) by vulcanization molding of the vibration isolating substrate.

The main body fitting (1) is composed of a cylindrical upper member (1a) which also serves as a mounting fitting for the diaphragm (5) and a lower member (1b) to which the vibration-proof base (3) is attached. It is configured.

The partition member (8) forming the orifice (7) is formed by drawing from a plate-like body,
As shown in FIGS. 3A and 3B, a substantially U-shaped groove (12) is formed on the outer peripheral portion of the partition member (8). The partition member (8) is the upper member (1a) of the main body metal fitting (1).
A communication that is installed so as to hold the groove (12) in a liquid-tight manner with respect to the inner circumference of the container, and that communicates with one liquid chamber (6a) that is partitioned from the groove (12) by a partition member (8). A communication hole (1) communicating with the hole (13) and the other liquid chamber (6b).
4) is provided and by closing (15) a part of the groove (12) between the communication holes (13) (14),
The groove (12) is configured to form a flow path of the orifice. The communication holes (13) and (14) are connected to the closed portion (1).
By forming as shown in the figure with 5) in between, the flow path of the orifice (7) can be made long. (16)
Is a rubber elastic body attached to the center of the partition member (8).

The main part (A) of the above-mentioned vibration-proof mount is a bracket (17) fixed to the vehicle body, and a bowl-shaped part (17a) above the bracket has a lower member ( 1b) is press-fitted and supported, and a vibration-proof substrate (3)
A stay (19) on the side of a vibration generator such as an engine having a stopper rubber (18) is fixed to a hanging protrusion (11a) of a core fitting (11) fixed to the core metal via a bolt.

That is, the vibration generator is used by being supported in a suspended state, and both liquid chambers (6a) by the orifice (7) are used.
Due to the liquid flow effect of (6b) and the vibration damping effect of the vibration damping substrate (3), the vibration damping function and the vibration insulating function are fulfilled.

The protective cover (9) of the diaphragm (5) is constructed and fixed as follows.

The opening (4) of the metal fitting (1) is formed by folding the metal fitting end portion outwardly by drawing the upper member (1a), and the end edge side of this folding portion (20) is formed. It is formed as an extension (21) (chain line in FIG. 2). The diaphragm (5) is vulcanization molded by vulcanization molding so that the opening (4) is embedded in the rubber portion (5a), and is integrally attached.

The peripheral portion (9a) of the protective cover (9) is elastically fitted to the outer periphery of the opening (4) through the rubber portion (5a) of the diaphragm (5). That is, the inner diameter of the peripheral portion (9a) is formed to be slightly smaller than the outer diameter of the rubber portion (5a), and is fitted by utilizing the elasticity of the rubber portion (5a) to maintain a close contact state. Has become. Then, an extending portion (21) extending from the folded-back portion (20) of the main body metal fitting (1) along the fitting portion of the peripheral edge portion (9a).
Is caulked over the entire circumference so as to tighten the peripheral edge portion (9a), whereby the protective cover (9) is fixed to the opening portion (2).

As a result, the protective cover (9) is fitted through the rubber portion (5a) of the diaphragm (5) into the opening (4) reinforced by forming a double structure by folding back the end of the metal fitting. It is attached and is further tightened and fixed by caulking the extension part (21) over the entire circumference, and is held in a state of being sandwiched between the opening part (4) and the extension part (21) together with the rubber part of the diaphragm. Therefore, the fixing is extremely reliable and strong, and there is no fear of loosening or rattling due to vibration or the like during traveling.

Moreover, the rubber portion (5a) of the diaphragm (5) inside the protective cover (9) serves as a sealing material, and the sealing property of this fixed portion is also well maintained, so that the protective cover (9) and Air chamber between diaphragm (5) (1
There is no problem in configuring 0) as a sealed type, and the sealed state can be maintained well. Further, by adopting such a sealed type, it is possible to prevent the atmosphere from coming into contact with the diaphragm (5), the diaphragm is well protected, and its durability can be improved. Of course, even in the case of an open mount, the protective cover can be securely attached.

In particular, as shown in the figure, the extension (2
The protective cover (9) is detached by extending 1) a little longer than the opening (4) and caulking the tip along the protective cover (9) so as to bend it slightly inward and reduce the diameter. Can be reliably prevented, more firmly fixed, and the sealing property can be further improved. Also diaphragm (5)
The attachment state of is also stable.

In the mounting structure of the protective cover (9) of the present invention, the vibration-damping base (3) is placed in one opening (2) of the tubular body fitting (1) and the other opening (4) is placed. The diaphragms (5) are attached to each other in a sealed state to form a liquid chamber (6), and the liquid chamber (6) is partitioned by a partition member (8) into a plurality of liquid chambers communicating with each other by an orifice. The liquid-filled type vibration-damping mount can be implemented in the same manner as above in vibration-damping mounts of various configurations other than the above-described embodiments.

For example, the flow path of the orifice (7) in the above embodiment is not formed by the groove (12) on the outer circumference of the partition member (8), but the upper member (1) of the main metal fitting (1).
It is possible to form a mount structure in which a part of a) is bulged outward and the bulged portion is formed as a flow path of an orifice between the bulged portion and a partition member mounted inside thereof. Further, the vibration proof mount of the above-mentioned embodiment is turned upside down to support the main body metal fittings by the bracket, and the vibration proof body is supported and used by the vibration proof base portion of the upper part so that the vibration proof mount is used. You can also

Further, a liquid chamber communicating with another vibration chamber is provided on the liquid chamber (6b) side of the partition member (8) in contact with the vibration-proof substrate (3) so that vibrations in different frequency ranges can be dealt with. It is also possible to have a mount configuration that is set to.

[0032]

As described above, according to the present invention, since the protective cover of the diaphragm is fitted through the rubber portion of the diaphragm and fixed by caulking the extending portion from the body metal fitting from the outside thereof. It is fixed securely, and there is no risk of loosening, rattling, or coming off due to vibration during traveling.

Moreover, since the rubber portion of the diaphragm inside the protective cover serves as a sealing material, and the sealing property of the fixed portion is also well maintained, the air chamber between the protective cover and the diaphragm is of a sealed type. And can be used for various mount configurations. Further, by making the air chamber a sealed type, the air chamber has a backup function for the diaphragm, and it is possible to prevent the diaphragm from coming into contact with the atmosphere, which is a countermeasure against ozone, and the durability of the diaphragm can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an antivibration mount according to an embodiment of the present invention.

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

FIG. 3 is a plan view (a) and a vertical sectional view (b) of a partition member forming an orifice.

FIG. 4 is a vertical cross-sectional view showing a main part of a conventional vibration proof mount.

FIG. 5 is an enlarged cross-sectional view of a main part of the above.

[Explanation of symbols]

 (1) Main body metal fittings (1a) Upper member (1b) Lower member (2) Opening (3) Anti-vibration base (4) Opening (5) Diaphragm (5a) Rubber part (6) Liquid chamber (6a) (6b) ) Partitioned liquid chamber (7) Orifice (8) Partition member (9) Protective cover (9a) Peripheral part (10) Air chamber (20) Folded part (21) Extended part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeki Kimura No. 3 Ikugayama, Uchikoshi, Miyoshi-cho, Nishikamo-gun, Aichi Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center

Claims (2)

[Claims] 1. A liquid chamber is formed by sealingly attaching a vibration-damping base made of a rubber elastic body to one opening of a cylindrical main body fitting and a diaphragm made of a rubber film to the other opening. A liquid-filled type vibration-proof mount in which the liquid chamber is partitioned by a partition member into a plurality of liquid chambers that communicate with each other by an orifice, and a diaphragm protective cover is provided outside the opening of the main body metal fitting to which the diaphragm is attached. This protective cover has its peripheral edge fitted to the outer periphery of the opening where the diaphragm is attached via the rubber portion of the diaphragm, and the extension from the main metal fitting along the fitted portion. A liquid-filled antivibration mount characterized by being caulked and fixed over the entire circumference so as to tighten the peripheral portion. 2. An opening of a main body metal fitting is formed by folding back an end of the metal fitting, and an edge portion side of the folding back portion is an extension portion, and a diaphragm is attached so as to bury the opening. The protective cover has a peripheral edge portion fitted to the outer periphery of the rubber portion of the diaphragm, and is fixed by caulking an extending portion from the folded-back portion of the body metal fitting over the entire periphery so as to tighten the peripheral edge portion. The liquid-filled antivibration mount according to claim 1, wherein