JP2580806Y2 - Control type liquid filled anti-vibration mount - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a liquid-filled anti-vibration mount used to support a vibration generating body such as an engine of an automobile in a vibration-proof manner, and more specifically to a vibration damping performance and the like. The present invention relates to a control-type liquid-filled anti-vibration mount capable of controlling the vibration.

(Prior Art) As a vibration isolator for supporting an automobile engine so that its vibration is not transmitted to a member side, two liquid chambers separated by a partition plate are provided inside a rubber vibration isolating base. An orifice having a required length and a cross-sectional area is provided in each of the above-mentioned types, and a liquid-filled anti-vibration mount having a so-called orifice structure in which both liquid chambers are communicated with the orifice has been conventionally used.

In recent years, characteristics such as damping performance of this type of anti-vibration mount have been externally controlled. As a control means, an air chamber made of a flexible thin film is provided in the liquid chamber. Japanese Patent Application Laid-Open No. 61-119834 discloses a method for adjusting the pressure in the air chamber.

In the above-mentioned publication, a thin film is provided between the vibration-isolating base and the partition plate for partitioning the liquid chamber, and in particular, a thin film is provided along the inner surface of the vibration-isolating base, and air can be supplied and discharged between the thin film and the vibration-isolating base. It has a structure to achieve both engine noise cutoff in the high frequency range and attenuation of engine vibration in the low frequency range.

(Problems to be Solved by the Invention) However, when driving a car, there is vibration received from the road surface, and the vibration may cause the engine to resonate. On the other hand, the above-mentioned conventional anti-vibration mount does not have a sufficient structure as a measure against the above-mentioned shake, even if its damping performance can be controlled to some extent by supplying and discharging air.

The present invention addresses the above circumstances, and in particular, by providing two orifice structures on a liquid-filled anti-vibration mount and opening and closing one of the orifice structures,
It is an object of the present invention to prevent a shake of an engine by increasing a damping coefficient against vibration caused by a road surface during running.

(Means for Solving the Problems) That is, the feature of the control type liquid-filled anti-vibration mount according to the present invention that meets the above-mentioned object is that the first and second orifice structures are provided in the liquid chamber of the mount, The structure includes a rigid case housed in the liquid chamber, a first diaphragm formed in a sealed state by forming a sealed air chamber in the rigid case, and a case spaced apart from the first diaphragm. A first orifice disposed in the opening, forming a first sub-liquid chamber with the first diaphragm, and forming a first orifice on the periphery along the vicinity of the inner wall of the case and communicating the first sub-liquid chamber with the liquid chamber; The second orifice structure is provided with a second diaphragm made of the rubber film and a second sub liquid chamber formed on the liquid chamber side of the second diaphragm. And the second sub liquid chamber and the liquid chamber A second partition plate having a communication hole for communication and forming a second orifice, and an air pressure adjustment chamber provided with the second diaphragm as one wall on the side opposite to the liquid chamber of the second diaphragm. An air pressure adjusting device for raising and lowering the second diaphragm is connected to the air pressure adjusting chamber, and when the second diaphragm is raised by the air pressure adjusting device, the entire second diaphragm is located inside the second sub liquid chamber. The opening of the second orifice is closed along
The arrangement is such that the flow of the sealed liquid to the second orifice is prevented so that only the first orifice structure acts.

Furthermore, in the above-mentioned vibration-proof mount, it is also preferable that the first orifice structure floats without being fixed in the liquid chamber using the rigid case as a capsule. Claim 2 describes this.

(Operation) The control type liquid-filled anti-vibration mount having the above-described structure forms the second auxiliary liquid chamber by lowering the second diaphragm of the second orifice structure in the direction opposite to the liquid chamber by air pressure during idling. The idler vibration is absorbed by circulating the filled liquid through the second orifice structure and the first orifice structure, and the second diaphragm is raised toward the partition plate by air pressure during traveling, whereby The second sub liquid chamber is completely closed to prevent the flow of the sealed liquid into the second orifice of the second orifice structure, and only the first orifice structure is operated to prevent the engine from shaking.

When the first orifice structure is not fixed in the liquid chamber, the flow of the sealed liquid to the second orifice structure is freer than when the flow is fixed.

(Embodiment) Hereinafter, an engine mount according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a first embodiment of the present invention, in which a left half shows a state where a second diaphragm is raised, and a right half shows a state where it is lowered. In the figure, (1) is a vibration-isolating base made of a rubber elastic body, (2) is a main body fitting as a peripheral wall,
(3) is a second diaphragm made of a rubber film, and these form a liquid chamber (4). An engine-side mounting member (5) is mounted on the vibration-isolating base (1), and a member-side mounting member (5a) is mounted on the lower part of the main body fitting (2).

The liquid chamber (4) is provided with a first orifice structure (A) and a second orifice structure (B), and the first orifice structure (A) is a bowl-shaped rigid case floating in the liquid chamber. (6), a closed air chamber (7) formed by the bottom of the case (6), a first diaphragm (8) mounted in a sealed state, and the first auxiliary liquid chamber (8) by the diaphragm (8). 9)
And a partition plate (11) having a first orifice (10) disposed therein. The first orifice (10) is
Opening (10a) leading to liquid chamber (4) and first sub liquid chamber (9)
The liquid chamber (4) communicates with the first sub-liquid chamber (9).

The second orifice structure (B) has a second diaphragm (3) made of the above-mentioned rubber film and a second sub-liquid chamber (12) formed by the diaphragm (3). A second partition plate (14) having two orifices (13). The second orifice (13) has an opening (13a) leading to the liquid chamber (4) and an opening (13) leading to the second auxiliary liquid chamber (12).
b) to make the liquid liquid (4) communicate with the second sub liquid chamber (12).

The second diaphragm (3) has a shape along the inner side of the second auxiliary liquid chamber (12) as shown in the left half of the figure when the engine is mounted, and the diaphragm (3) is formed by one wall. A vacuum pump (not shown) connected to a vacuum working chamber (15) provided as below moves down to a state where a second sub liquid chamber (12) is formed as shown in the right half of the figure.

When the mounted engine is idling, the anti-vibration mount having the above-described configuration operates the vacuum to lower the second diaphragm (3) downward to be in a state at the right end in the drawing. As a result, a second sub liquid chamber (12) is formed in the second orifice structure (B) as shown in FIG.
The filling liquid can flow through the orifice structure (B), and the mount acts on the first and second orifice structures (A) and (B) to absorb a large amplitude of idle. That is, at the idling amplitude of 20 to 30 Hz, the dynamic spring constant is reduced as shown in FIG.
The attenuation coefficient at this time is as shown in FIG.

On the other hand, when the vehicle is running, the vacuum is stopped and the air pressure in the vacuum working chamber (15) is returned to the natural state, whereby the second diaphragm (3) is moved toward the second partition plate (14) as shown in the left half of FIG. And the second orifice (13) is closed to prevent the flow of the filled liquid through the orifice. This allows the mount to act only on the first orifice structure and prevents shaking of the engine. That is, at around 10 Hz, which is the vibration during running, FIG.
As shown in (1), the attenuation coefficient is increased. The dynamic spring constant at this time is as shown in FIG.

Next, the second and third embodiments of the present invention will be described with reference to FIGS. In these embodiments, the upper half portion including the first orifice structure is the same as that of the first embodiment, and will not be described.

FIG. 2 is a sectional view showing a second orifice structure of the second embodiment, wherein (2) is a main body fitting, (3) is a second diaphragm, (4) is a liquid chamber, and (5a) is a member. A side mounting bracket, (13) is a second orifice, (14) is a second partition plate, (15) is a vacuum working chamber, and these members are configured in the same manner as in the first embodiment. In this embodiment, a support plate (17) supported by a coil spring (16) is disposed below the center of the second diaphragm (3), and the second diaphragm (3) rises when the vacuum is off. And the closure of the second orifice (13) is made more secure.

The operation of the second embodiment is equivalent to that of the first embodiment.

As described above, the embodiment of the present invention has been described. In the above-described embodiment, the vacuum is used as the air pressure adjusting device. However, the second diaphragm may be moved up and down by compressed air by an air compressor or the like.

(Effect of the invention) As described above, the control type liquid-filled mount of the invention is
With two orifice structures in the mount,
One of the orifice structures can be selectively closed or opened by pneumatic pressure. When the mounted engine is idling, both orifice structures act to reduce the dynamic spring constant of 20 to 30 Hz. This effectively absorbs idle vibration, while closing one orifice structure during driving to increase the damping coefficient around 10Hz, thereby preventing engine shake due to vibration from the road surface, This has a remarkable effect that these vibrations can be attenuated according to the vibration characteristics of the engine that change when the engine stops.

Then, since one orifice structure is completely closed and the characteristics of only the other orifice structure are operated, the side on which the orifice structure is operated without considering the influence of the orifice structure on the closed side at the time of mounting design. This also has the advantage that the characteristics of the orifice structure can be set.

In this case, since the entire second diaphragm made of the rubber film is directly along the inside of the second sub liquid chamber, the second sub liquid chamber is eliminated, and the opening of the second orifice is closed. In addition, it is possible to surely achieve this with a simple configuration without requiring special precision.

Furthermore, the one orifice structure is not fixed in the liquid chamber of the mount and is free, so that the flow of the sealed liquid to the other orifice structure can be improved,
When operating both of the orifice structures, there is also an effect that the effects of these two orifice structures can be fully exhibited.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view showing a second orifice structure of a second embodiment, and FIG.
FIG. 3A is a graph showing a spring constant curve when the first embodiment is set for idling, FIG. 3B is a graph showing the same damping coefficient curve, and FIG. 4A is a first embodiment. FIG. 4 (b) is a graph showing the spring constant curve when the example is set for running, and FIG. 4 (b) is a graph showing the same damping coefficient curve. (A) ... first orifice structure, (B) ... second orifice structure, (3) ... second diaphragm, (4) ...
... liquid chamber, (6) ... rigid case, (7) ... sealed air chamber, (8) ... first diaphragm, (9) ... first sub liquid chamber, (10) ... first orifice, (11) First partition plate, (12) Second sub-liquid chamber, (13) Second orifice, (14) Second partition plate, (15) Vacuum working chamber.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yukio Takashima 3rd Ikayama, Uchikoshi, Miyoshi-cho, Nishikamo-gun, Aichi Prefecture Inside the Toyo Tire & Rubber Co., Ltd. Automobile Parts Product Technology Center (72) Inventor Shuichi Okamoto Nishikamo-gun, Aichi Prefecture No. 3 Ikayama, Uchikoshi, Miyoshi-cho Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (56) References JP-A-61-128124 (JP, A) JP-A-64-74334 (JP, A) JP-A-59-93537 (JP, A) JP-A-59-117929 (JP, A) JP-A-60-61540 (JP, U) JP-A-63-35838 (JP, U) JP-A-60-145636 (JP, A) , U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16F 13/00

Claims (2)

(57) [Scope of request for utility model registration] 1. A liquid-filled vibration-proof mount in which a vibration-proof substrate made of a rubber elastic body and a rubber film are opposed to each other and connected in a liquid-tight manner on a peripheral wall to form a liquid chamber. The first and second orifice structures are provided, and a first orifice structure is provided.
The orifice structure has a rigid case housed in the liquid chamber, a first diaphragm formed in a sealed state by forming a sealed air chamber in the rigid case, and an interval with respect to the first diaphragm. The first opening.
A first partition wall forming a first sub-liquid chamber with the diaphragm, and a first partition plate forming a first orifice on the periphery along the vicinity of the inner wall of the case and communicating the first sub-liquid chamber with the liquid chamber; The second orifice structure is provided with a second diaphragm made of the rubber film and a second sub liquid chamber formed on the liquid chamber side of the second diaphragm, and the second sub liquid chamber and the liquid are formed around the second sub liquid chamber. A second partition plate having a communication hole for communicating with the chamber and forming a second orifice, and adjusting the air pressure on the side opposite to the liquid chamber of the second diaphragm by using the second diaphragm as one wall. Room is provided,
An air pressure adjusting device for raising and lowering the second diaphragm is connected to the air pressure adjusting chamber, and when the second diaphragm is raised by the air pressure adjusting device, the entire second diaphragm follows the inside of the second sub liquid chamber. And the second
A control-type liquid-filled anti-vibration mount characterized in that the opening of the orifice is closed to prevent the flow of the filled liquid to the second orifice so that only the first orifice structure acts. 2. The liquid-filled anti-vibration mount according to claim 1, wherein said first orifice structure is suspended in said liquid chamber with a rigid case as a capsule.