JP3309179B2 - Liquid filled vibration damping device - Google Patents

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-proofly supporting a power unit such as an automobile engine or other vibration generators.

[0002]

2. Description of the Related Art As a vibration isolator for supporting a vibration generator such as an automobile engine so as not to transmit the vibration to a vehicle body or the like, a main body having a vibration isolating base made of a rubber elastic body. A partition member and a diaphragm are arranged inside, and these are partitioned into two upper and lower chambers forming a part of the chamber wall to provide a liquid chamber filled with liquid, and both liquid chambers are communicated by an orifice passage on the outer periphery of the partition member. There is known a liquid-filled type vibration damping device configured to perform a vibration damping function and a vibration insulating function by a liquid flow effect of both chambers by a orifice and a vibration damping effect of a vibration damping base.

For example, as disclosed in Japanese Patent Application Laid-Open No. 8-14315, the shape of a partition member is simplified so as to reduce the weight and the cost. There has been proposed an anti-vibration device which is separated from an orifice for communicating a chamber.

As shown in FIG. 6, such a vibration isolating device has a vibration isolating base (1) made of a rubber elastic body at an opening of a bottomed cylindrical mounting bracket (101) also serving as a case mounted on the vehicle body side.
03) is attached via a reinforcing metal fitting (131) on the outer periphery thereof, and an intermediate cylinder (110) and a partition member (107) are arranged therein via a cylindrical rubber elastic body (104). The interior is divided into two compartments. The partition member (107) is formed of an inverted bowl-like cylindrical body, and a diaphragm (105) is attached to an opening thereof to form an inside as an air chamber (108). Then, by fitting this inside the intermediate cylinder (110), the vibration-proof base (103) forms a part of the chamber wall in the liquid chamber (106b).
And a liquid chamber (106a) in which the diaphragm (105) forms a part of the chamber wall.
(106b) is formed in the rubber elastic body (104) through a communication hole (109a) penetrating the reinforcing metal fitting (131), the intermediate cylinder (110), and the rubber elastic body (104) outside thereof. The orifices (109) communicate with each other. (102) is an upper fitting attached to a power unit such as an engine.

In the above-described liquid-filled type vibration damping device, the intermediate cylinder (11) in which the diaphragm (105) is vulcanized and bonded together with the cylindrical rubber elastic body (104) forming the orifice (109).
0), a partition member (107) is attached thereto, and then the intermediate cylinder (110) is fitted inside the reinforcing metal fitting (131) in the liquid, and then the intermediate cylinder (110) and the mounting metal fitting (101) are attached. An orifice (109) is formed with a cylindrical rubber elastic body (104) interposed between the intermediate cylinder (110) and the intermediate cylinder (110).
And the reinforcing bracket (131) are assembled by caulking and fixing at the opening end of the mounting bracket (101).

However, the vibration isolator includes a cylindrical rubber elastic body (104), an intermediate cylinder (110), and a diaphragm (1).
05) and the partition member (107) have a complicated internal structure, and the communication hole (109a) between the reinforcing metal member (131) and the cylindrical rubber elastic body (104) including the intermediate cylinder (110) is accurately positioned. It is necessary to set the fitting position by the engagement of the intermediate cylinder (110) in the caulked portion, and there is a problem in parts assemblability, and it has been difficult to ensure reliability.

Further, the intermediate cylinder (110) and the reinforcing bracket (13)
1) Since it is necessary to secure by caulking, it is necessary to secure a space for the caulking mold during assembly, and the shape, size, welding position, etc. of the mounting stay attached to the mounting bracket are limited. However, there was a problem that it was not possible to design freely.

Japanese Patent Application Laid-Open No. Hei 9-25983 discloses that
As a liquid filled vibration isolator, a diaphragm is formed integrally with a cylindrical rubber member in which a cylindrical reinforcing fitting is embedded, and a partition member is fitted around the inner periphery of the cylindrical rubber member. The member is fitted to the inner periphery of the body of the main body fitting, the interior is partitioned into two liquid chambers by a partition member and a diaphragm, and both liquid chambers are connected to the outer periphery of the cylindrical rubber member through a communication hole penetrating the reinforcing fitting. Are connected by orifices formed at the same time.

In the proposed liquid filled type vibration damping device,
In order to determine the fitting position of the cylindrical rubber member to the body, a step is formed between the upper body and the lower body of the main body fitting, and the reinforcing fitting is engaged with the step. In addition, there is a problem in that extra processing is required for the main body metal fittings and a means for fixing the engaging portion is required, which reduces the degree of freedom in design.

That is, in recent years, not only high functionality but also low cost are demanded, and a liquid-filled protection device capable of improving the assemblability by further reducing the number of components and providing a simple configuration. There is a need for a vibration device.

The present invention has been made in view of the above, and it is possible to improve parts assemblability as a simple configuration with a reduced number of components without impairing the reliability of the product and the sealing performance of the sealed liquid. Another object of the present invention is to provide a liquid filling type vibration damping device capable of reducing cost.

[0012]

SUMMARY OF THE INVENTION The present invention is a liquid-filled type vibration damping device for solving the above-mentioned problems. The invention of claim 1 is directed to a bottomed cylindrical main body fitting and an opening side thereof. The mounting brackets are connected to each other by interposing a vibration isolating base made of a rubber elastic body between them, and a diaphragm and a partition member made of a rubber film facing the vibration isolating base are arranged inside the main body fitting, A liquid-filled type vibration damping device comprising two liquid chambers and an air chamber communicating with each other by an orifice, wherein a cylindrical rubber member having an orifice groove on its outer periphery and a diaphragm connected to one end thereof are integrally formed. A partition member is fitted to the inner periphery of the cylindrical rubber member to form an air chamber between the diaphragm and the partition member, and the cylindrical rubber member with the diaphragm is formed from the side of the diaphragm to the cylindrical body of the main body fitting. Abuts on bottom By press-fitting to a position, an orifice is formed between the cylindrical body by the orifice groove on the outer periphery of the cylindrical rubber member, and a liquid chamber is formed between the diaphragm and the bottom of the main body fitting, Further, the reinforcing metal fitting at the outer periphery of the lower end of the vibration isolating base is press-fitted into the opening side of the cylindrical body of the main body fitting and fixed so as to press the upper end of the cylindrical rubber member, and the liquid between the vibration isolating base and the partition member is liquid. is formed as a chamber, Ri Na with these two liquid chambers communicated with said orifice, said in the tubular rubber member Daiyafu
Notch connected to the orifice at the open end opposite to the ram
Part, the outer peripheral portion of the partition member is more than the notch portion
It is characterized in that it is located on the diaphragm side .

According to this liquid filled type vibration damping device, since the cylindrical rubber member having the orifice groove and the diaphragm are integrally formed, the partition member is fitted therein to form the air chamber. Then, this is press-fitted into the cylindrical body portion of the main body fitting to a position where it contacts the bottom portion, and further, an annular reinforcing metal fitting on the outer periphery of the vibration isolating base is press-fitted into the opening of the main body fitting,
The cylindrical rubber member and the diaphragm forming the orifice can be securely held in a fixed state by being sandwiched between the bottom of the main body fitting and the reinforcing fitting, and can be easily assembled without caulking.

In addition, an integrally formed cylindrical rubber member for forming an orifice and a diaphragm are sandwiched by a partition plate, a main body fitting, and a reinforcing fitting on the outer periphery of the vibration isolating base, and are fixed in the filling liquid. Therefore, the configuration can be simplified without deteriorating the reliability, and the number of components can be reduced.

In the above-mentioned liquid-filled type vibration damping device, the partition member has an axially symmetrical reinforcing tubular portion extending toward the diaphragm on the outer periphery of the partition plate portion, and the reinforcing tubular portion is formed of a cylindrical rubber. The inner periphery of the part is fitted so as to be in close contact over substantially the entire periphery from the continuous portion with the diaphragm to the vicinity of the opening end,
The one provided so as to hold the cylindrical rubber portion in a cylindrical shape is preferable.

In this case, since the reinforcing tubular portion of the partition member is fitted on the inner periphery of the tubular rubber member, excessive elastic deformation in the diameter reducing direction of the tubular rubber member can be restricted, and The close contact state of the rubber member and the first mounting bracket by press fitting can be favorably maintained, and the sealing performance and reliability of the sealed liquid are further improved.

[0017]

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

FIG. 1 shows an example of a liquid filling type vibration damping device according to the present invention.

In the figure, (1) is a bottomed cylindrical main body fitting also serving as a case having a cylindrical body (11), and (2) is an upper side provided with mounting bolts (21). , Which is coaxially opposed to the opening of the main body fitting (1). Either one of the main body fitting (1) and the mounting fitting (2), mainly the mounting fitting (2) is fastened to the vibration generator such as an automobile engine, and the main body fitting (1) is fastened to the vehicle body. You. Therefore, the main body fitting (1) is provided with a mounting stay (12) or a mounting bolt to the vehicle body side on the outer periphery of the tubular body (11) as shown in the figure.

(3) is a thick anti-vibration base made of a rubber elastic body interposed between the main body fitting (1) and the upper mounting fitting (2). The anti-vibration base (3) has a substantially umbrella shape as shown in the figure, and the mounting bracket (2) is fixedly provided at the upper end thereof, and at the outer periphery of the lower end thereof at the opening of the main body mounting (1). An annular reinforcing metal fitting (31) to be press-fitted is fixedly provided. An upper end of the reinforcing metal fitting (31) is formed with a flange portion (31a) abutting on a flange (11a) at an opening end of the main body metal fitting (1), and a lower end portion is formed to be bent inward. These mounting bracket (2) and reinforcing bracket (3)
1) is fixed by being vulcanized and bonded simultaneously with the vulcanization molding of the vibration-proof substrate (3).

(4) is a cylindrical rubber member pressed into the inner periphery of the cylindrical body (11) of the main body fitting (1), and (5) is connected to one end side of the cylindrical rubber member (4). A diaphragm made of a rubber film, wherein the cylindrical rubber member (4) and the diaphragm (5) are integrally formed only of a rubber material.

The cylindrical rubber member (4) is provided on the diaphragm (5) with respect to the cylindrical body (11) of the main body fitting (1).
Is press-fitted from the side to the position where it comes into contact with the bottom portion (14) of the main body fitting (1), and the first liquid chamber ( 6a)
It is formed as.

A partition member (7) is fitted on the inner periphery of the cylindrical rubber member (4), and an air chamber (8) in which the space between the diaphragm (5) and the partition member (7) is kept airtight. ). The partition member (7) is made of a metal press-formed product such as a steel plate, and as shown in the figure, the partition plate portion (7).
a) has a reinforcing tubular portion (7b) extending toward the diaphragm (5) on the outer periphery thereof, and the reinforcing tubular portion (7b) is a diaphragm (5) on the inner periphery of the cylindrical rubber member (4). The rubber member (4) is fitted so as to be in close contact over substantially the entire circumference from the continuation portion to the vicinity of the opening end, thereby restricting excessive elastic deformation of the cylindrical rubber member (4) and holding the cylindrical shape. ing. In some cases, a rubber film may be provided by opening the center of the partition plate (7a).

On the opening side of the cylindrical body (11) of the main body fitting (1), an annular reinforcing metal fitting (31) around the lower end of the vibration-proof base (3) is provided. It is press-fitted and fixed to a position where it comes into contact with and presses against the upper end of the cylindrical rubber member (4), whereby the main body fitting (1) and the vibration-proof base (3) are joined together, and A space between the partition member (7) and the partition member (7) is formed as a second liquid chamber (6b).

As shown in FIG. 4, on the outer periphery of the cylindrical rubber member (4), the cylindrical rubber member (4) located at a position closer to the vibration isolating base (3) than the partition member (7). Starting from a notch (41) provided at a part of an upper end, a diaphragm (5) is formed by a communicating part (42) formed at a part of a lower end.
Orifice groove (43) leading to the outer liquid chamber (6a)
Is formed, and the cylindrical rubber member (4) is formed into a cylindrical body (11).
The groove (43) is formed as an orifice (9) having openings to both liquid chambers (6a) and (6b) between the cylindrical body (11) and the cylindrical body (11). And the filled liquid is communicated so that it can be circulated.

The orifice (9) in the drawing extends in the circumferential direction from the notch (41) and is folded in substantially one round to form a zigzag shape and has a length of two or more rounds. The length, cross-sectional area, and the like can be appropriately set according to the vibration isolation characteristics, and can be changed only by changing the mold for molding the cylindrical rubber portion (4). In particular, since the notch (41) and the communication part (42) are located at the upper and lower ends of the cylindrical rubber member (4), it is easy to change the mold.

The liquid filled type vibration damping device having the above structure is assembled and constructed as follows.

First, in the air, a partition member (7) is airtightly fitted to the inner periphery of a cylindrical rubber member (4) integrally formed with the diaphragm (5), and the diaphragm (5) and the partition member An air chamber (8) is formed between (7) (1 in FIG. 5). In this case, it is only necessary to fit the partition member (7) inwardly from the position of the cutout (41) at the upper end of the cylindrical rubber member (4), and it can be easily fitted.

Next, in the liquid tank, the cylindrical rubber member (4) assembled as described above is attached to the cylindrical body (11) of the main body (1) from the side of the diaphragm (5) by the bottom (14). 5) (FIG. 5-2) to form a liquid chamber (6a) filled with liquid between the diaphragm (5) and the bottom (14) of the main body (1). Further, the reinforcing metal fitting (31) on the outer periphery of the lower end of the vibration-proof base (3) is pressed into the opening side of the main metal fitting (1) from above (3 in FIG. 5). The lower end is fixed so as to press the upper end of the cylindrical rubber member (4).

Thus, the cylindrical rubber member (4) and the diaphragm (5) forming the orifice (9) are clamped between the bottom part (14) of the main body fitting (1) and the reinforcing fitting (31). And a liquid chamber (6a) between the diaphragm (5) and the bottom portion (14) and a liquid chamber (6b) between the partition member (7) and the vibration-proof base (3).
The liquid-filled type vibration damping device having the configuration shown in FIG. 1 in which liquid is sealed and communicated with the orifice (9) on the outer periphery of the cylindrical rubber member (4) is easily assembled and configured. Since the caulking fixation is not particularly required, the assembling work can be performed without any problem even if the main body fitting (1) is provided with the mounting stay (12) as shown in the figure.

[0031]

As described above, according to the liquid filled type vibration damping device of the present invention, the cylindrical rubber member for forming the orifice integrally formed with the diaphragm is press-fitted to the position where it comes into contact with the bottom of the main body fitting. By press-fitting the reinforcing metal fitting on the outer periphery of the lower end of the vibration base into the main metal fitting, it is possible to easily assemble and configure.
In particular, since caulking is not required, not only the assembling and manufacturing processes can be simplified, but also the shape, size, and welding position of the mounting stay limited to the space of the caulking mold can be freely designed.

In addition, the integrally formed orifice-forming cylindrical rubber member and the diaphragm are sandwiched between the partition plate, the body and bottom of the main body fitting, and the reinforcing metal fitting on the outer periphery of the vibration isolating base, and the sealed liquid is formed. Since it is fixed inside, a simple configuration can be achieved without deteriorating reliability, the number of components can be reduced, and cost can be reduced.

Further, according to the second aspect, the sealing performance and reliability of the sealed liquid are further improved.

[Brief description of the 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 plan view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a front view of a half vertical section of a diaphragm and a cylindrical rubber member.

FIG. 5 is an explanatory cross-sectional view of an assembled state of the liquid filling vibration isolator.

FIG. 6 is a longitudinal sectional view showing a conventional liquid-filled type vibration damping device.

[Explanation of symbols]

 (1) Body bracket (11) Cylindrical body (14) Bottom (2) Mounting bracket (3) Vibration isolation base (31) Reinforcement bracket (4) Cylindrical rubber member (43) Groove for orifice (5) Diaphragm ( 6a) Liquid chamber outside diaphragm (6b) Liquid chamber on vibration-isolating substrate side (7) Partition member (7b) Reinforcing cylinder (8) Air chamber (9) Orifice

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Nozawa 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Yukio Takashima 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire & Rubber Co., Ltd. Inside (72) Inventor Kentaro Yamamoto 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire & Rubber Co., Ltd. (72) Inventor Yutaka Sadamori 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Gohro (56) References JP-A-10-38015 (JP, A) JP-A-8-170683 (JP, A) JP-A-8-254240 (JP, A) JP-A-8-14315 (JP, A) A) JP-A-9-25983 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 13/10 F16F 13/18 B60K 5/12

Claims (2)

(57) [Claims] A bottomed cylindrical main body and a mounting bracket facing the opening side thereof are connected to each other with a vibration-proof base made of a rubber elastic body interposed therebetween. A liquid-sealed vibration isolator comprising a diaphragm and a partition member made of a rubber film opposed to a vibration-isolating base, and provided with two liquid chambers and an air chamber communicating with each other by an orifice, wherein an orifice forming groove is provided. A cylindrical rubber member having an outer periphery and a diaphragm connected to one end thereof are integrally formed, a partition member is fitted to an inner periphery of the cylindrical rubber member, and an air chamber is formed between the diaphragm and the partition member. Then, the cylindrical rubber member with the diaphragm is press-fitted from the diaphragm side to a position where the cylindrical rubber member of the main body fitting comes into contact with the bottom, and the cylindrical rubber member is connected to the cylindrical body by an orifice groove on the outer periphery of the cylindrical rubber member. Orifice in between To form a scan, between the bottom of the diaphragm and the metal body is formed as a liquid chamber, the further press-fitting the reinforcing bracket of the lower end outer periphery of the vibration-isolating base on the opening side of the cylindrical body of the main body metal fitting Lower end of reinforcement bracket
There fixed so as to press the tubular rubber member upper end, said forming between the vibration isolating substrate and the partition member as the liquid chamber, Ri Na with these two liquid chambers communicated with said orifice, the tubular rubber member On the side opposite to the diaphragm
A notch communicating with said orifice to an open end disposed in the outer peripheral portion is the notch of the partitioning member Daiyafura
A liquid filled type vibration damping device, which is located on the system side. 2. The partitioning member has an axially symmetrical reinforcing tubular portion extending toward the diaphragm on the outer periphery of the partition plate, and the reinforcing tubular portion is connected to the diaphragm at the inner periphery of the cylindrical rubber portion. 2. The liquid-filled type vibration damping device according to claim 1, wherein the liquid-filling type vibration damping device is fitted so as to be in close contact over substantially the entire circumference from the continuous portion to the vicinity of the opening end.