JPH03234941A - Liquid seal type elastic bush - Google Patents

Abstract

PURPOSE:To obtain a high damping performance for both engine shaking and engine pitching, by dividing laterally the inner space of either of a first and a second liquid chamber or both of them with a separating wall made of elastic rubber into divided liquid chambers, and connecting through both chambers to each other with an orifice structure. CONSTITUTION:A first liquid chamber 6 is divided into a left divided chamber 12 and a right divided chamber 13 with a central separating wall 11 made of elastic rubber 2 extended upward and downward. And the respective divided liquid chambers 12, 13 are connected through to each other with an orifice structure 14 provided on the top side 11 of the wall 11. A second liquid chamber 7 is also divided into a left and a right chambers with a central separating wall 15 made of elastic rubber 2 extended upward and downward. And a through hole or a recession 16 is provided in the vicinity of an eccentric side portion over a side chamber 4 and a partition wall 5, and the partition wall 5 bounding on the second liquid chamber 7 located in the outside of the recession 16 is made thin and expanded to make a diaphragm structure 17 of this portion. Thereby the movement of liquid can be made easy to obtain high damping capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid-sealed elastic bushing suitable for use as an engine mount of an automobile.

[Conventional technology]

As a liquid-sealed elastic bushing used for such purposes, there is a space separated vertically by a rubber elastic body molded between an inner cylinder and an outer cylinder that are eccentrically arranged parallel to each other in the vertical (load) direction. It is known that a liquid is sealed in this space to form first and second liquid chambers, and the first and second liquid chambers are communicated with each other through an orifice structure. This is because, with this configuration, liquid movement within the liquid chamber occurs during vibration, resulting in a large damping effect. and,
In order to further improve the damping performance in this case, there is a system in which one of the vertically isolated liquid chambers in the anti-load direction is further divided into left and right sides (Japanese Patent Laid-Open No. 1-126451).

[Problem to be solved by the invention]

By doing this, it is possible to obtain high damping performance against vertical vibrations (engine shake) caused by the weight of the engine, but since the two divided liquid chambers are not communicated with each other by an orifice, etc., the engine It does not contribute in any way to the damping of vibrations (pitching) in the left-right direction perpendicular to the shake. Not only that, but it also makes the spring stronger and reduces its vibration absorbing properties.

Vibrations in automobiles are complex, and engine vibrations come from all directions, so it is not enough to simply consider engine shake.

This invention solves these problems,
The aim is to develop a liquid-sealed elastic bushing that can exhibit high damping performance against both engine shake and pitching.

[Means to solve the problem]

In view of the above-mentioned problems, the present invention forms a vertically isolated space in a rubber elastic body molded between an inner cylinder and an outer cylinder, and seals a liquid in this space so that the first and second In the liquid-sealing elastic bushing, in which the first and second liquid chambers are connected to each other by an orifice structure, one or both of the first and second liquid chambers is provided with a partition wall made of a rubber elastic material. The present invention provides a liquid-sealing type elastic bushing which is partitioned into left and right sides to form divided liquid chambers, and in which these divided liquid chambers are communicated with each other through an orifice structure.

[Effect]

By taking the above measures, the divided liquid chambers divided into left and right sides are communicated with each other through an orifice structure, so that liquid movement occurs even between the five divided liquid chambers during vibration in the left and right direction, and a damping effect is exerted. .

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a cross-sectional view of the liquid-sealed elastic bushing according to the present invention, Fig. 2 is the P homeland of Fig. 1, and Fig. 3 is the Q recovery of Fig. 2. A cylindrical rubber elastic body 2 is molded eccentrically in the direction opposite to the load direction on the outer periphery of an inner cylinder 1 made of metal, and an outer cylinder 3 also made of metal is fitted onto the outer periphery. By the way, this rubber elastic body 2 has two side walls 4 perpendicular to the axis of the inner cylinder 1, and a partition wall that bridges between these side walls 4 and protrudes in the shape of an inverted V-shaped wing on both sides of the inner cylinder 1 in an anti-eccentric direction. 5 as the skeleton, and the rear part is formed in space. Then, when fitting the outer cylinder 3, an antifreeze liquid such as ethylene glycol is filled in each space vertically separated by the partition wall 5, and these are defined as a first liquid chamber 6 and a second liquid chamber 7. Note that a ring-shaped reinforcing metal fitting 8 having the first liquid chamber 6 and second liquid chamber 7 portions cut out may be installed near the outer periphery of the rubber elastic body 2.

The first liquid chamber 6 and the second liquid chamber 7 communicate with each other through an orifice structure 9 formed around the top of the partition wall 5, and if the volumes of both liquid chambers 6 and 7 change due to vibration, the liquid will move accordingly. occurs, making it possible to exhibit damping properties. In addition, the orifice structure 9 at this time is made into a zigzag shape as shown in FIG. 3, and by making the length long,
Greater damping performance can be achieved. moreover.

At this time, a stopper 10 is loaded in the first liquid chamber 6 on the eccentric side in order to prevent the amplitude from becoming excessive.

By the way, in this invention, the partition wall 11 (molded integrally with the partition wall 5 etc. 12 and 13.
That is to say. The divided liquid chambers 12 and 13 are also communicated with each other through an orifice structure 14 formed around the top of the partition wall 11. In the embodiment shown in FIG. 1, the divided liquid chambers 12 and 13 are formed in the upper first liquid chamber 6 in the anti-eccentricity (load) direction.
When dividing only the liquid chamber on one side, set it to the liquid chamber on this side), accordingly, the stopper 10 is set to the liquid chamber on this side.
2.13 respectively is preferable (Fig. 4). Further, in this example, the center of the lower second liquid chamber 7 is partitioned into left and right sides by a partition wall 15 of the rubber elastic body 2 which also extends vertically, but the partitioned liquid chambers are not communicated with each other. However, it is also conceivable to communicate these liquid chambers.

In this case, both the first and second liquid chambers 6 and 7 are provided with divided liquid chambers, which is significant for vibrations with a large pitching component. Further, one hole or recess 1 is provided near the eccentric side end of the side wall 4 to 5 and the partition wall 5.
6 is provided, and the partition wall 5 which is critical to the second liquid chamber 7 on the end side of the dirt is made thin and bulges upward, and this part is made into a diaphragm structure 17.

This is because the liquid can move easily and a large damping property can be obtained.

FIG. 5 is a cross-sectional view showing another embodiment.

In this example, each orifice structure 9.14 is constructed from a separate part. In other words, it is made of metal with grooves 18, etc., which are liquid passages, formed on the outer periphery as an orifice structure 14 that communicates between the two divided liquid chambers 12 and 13, and an orifice 19 formed in the critical part of the two divided liquid chambers 12 and 13. , semi-arcuate ring orifice part 2 made of resin or rubber, etc.
0 (FIG. 6) is manufactured separately and assembled between the rubber elastic body 2 and the outer cylinder 3. At this time, a fitting step 21 or the like is formed on the outer periphery of the reinforcing metal fitting 8 to prevent the orifice component 20 from coming off the rubber elastic body 2 (FIG. 7). Furthermore, since the orifice part 20 cannot be made larger than a semicircle in this case, the missing part between it and the second liquid chamber 7 is compensated for by the sub-orifice part 23, which also has a groove 22 continuous to the groove 18 described above formed on the outer periphery. ,
Orifice structure 9 that communicates the first liquid chamber 6 and the second liquid chamber 7
(Figure 5).

FIG. 8 is a cross-sectional view showing still another embodiment, in which the diaphragm structure 16 and the sub-orifice component 23 described above are integrated and made into a separate component from the rubber elastic body 2. That is, the diaphragm component 2 is a semi-arcuous ring in which two diaphragm structures 25 are provided in the middle of the groove 24 on the outer periphery formed continuously in the groove 8 of the orifice component 20.
6 (FIGS. 9 and 10) is fitted onto the outer periphery of the rubber elastic body 2 on the opposite side from the orifice component 20. In this case, the length of the partition wall 15 on the second liquid chamber 7 side is up to the diaphragm component 26, and the length of the partition wall 15 on the second liquid chamber 7 side is up to the diaphragm component 26.
6 is defined as a second liquid chamber 7.

〔Effect of the invention〕

If the liquid-sealed elastic bushing with the above configuration is used for an engine mount, etc., even when vibrations occur in a direction perpendicular to the eccentric direction of the inner and outer cylinders 1 and 3, liquid movement will occur between the divided liquid chambers 12 and 13, resulting in a good It exhibits excellent damping properties.

Figure 11 is a vibration characteristic diagram in the eccentric direction showing this.
10 for this direction, i.e. engine shake.
By tuning so that the peak of the loss factor tan δ is in the low frequency range of about Hz, a large attenuation is exhibited in this vicinity, and the desired result can be obtained. On the other hand, Fig. 12 is a curve showing the vibration characteristics in the left-right direction, and as shown by the solid line in this curve, the loss factor tan δ reaches a peak around 10 Hz even for vibration in this direction, that is, pitching. It has been confirmed that if tuned in this way, the damping properties will be exhibited around this area, and the desired result will be obtained. The dotted line on the - side shows the conventional example without such a configuration, and it can be seen that neither the loss factor tan δ nor the dynamic spring constant Kd shows any change with respect to pitching.

Due to the presence of the partition wall 11 that defines the two-divided liquid chamber 12, 13, the rubber elastic body 2 and the partition wall 5 are both formed in a T-shape, making it difficult to buckle, reducing the amount of stickiness due to heat, and allowing long-term use. High reliability in case.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a liquid-sealed elastic bushing according to the present invention, Fig. 2 shows the P recovery shown in Fig. 1, and Fig. 3 shows the Q recovery shown in Fig. 2.
Fig. 4 is a perspective view of the stopper, Fig. 5 is a cross-sectional view of another embodiment, Fig. 6 is a perspective view of the orifice part of this embodiment, Fig. 7 is a perspective view of the reinforcing fitting, and Fig. 8 9 is a front view of the diaphragm component of this embodiment, FIG. 10 is a side view of the same, and FIG. 11 is a vibration characteristic diagram of this liquid-sealed elastic bushing against engine shake. , FIG. 12 is a vibration characteristic diagram for pitching as well. (Symbol) l... Inner tube 2... Rubber elastic body 3... Outer tube 9... Orifice structure 0 1]... Partition wall 12... Divided liquid chamber 13... Divided liquid chamber 14... Orifice structure

Claims (1)

[Claims] A vertically isolated space is formed in the rubber elastic body (2) molded between the inner cylinder (1) and the outer cylinder (3), and a liquid is sealed in this space to form the first and second liquids. chambers (6) and (7), and these first and second liquid chambers (6) and (7).
) in a liquid-sealed elastic bush in which the first and second liquid chambers (6), (7) communicate with each other through an orifice structure (9).
The inside of one or both of them is partitioned left and right by a partition wall (11) of a rubber elastic body (2) to form divided liquid chambers (12) and (13).
In addition, there is a liquid-sealed elastic bush in which these divided liquid chambers (12) and (13) are communicated with each other through an orifice structure (14).