JPH0212343Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in fluid-filled bushes.

As shown in FIG. 10, a pipe 61 that is fixed to the fixed member side and a sleeve 62 that is passed through the pipe 61 and connected to the vibration source are connected by a rubber wall 63 that extends in the diametrical direction. A fluid-filled bushing is known in which the fluid chamber is divided into upper and lower chambers 64 and 65, and the two fluid chambers 64 and 65 are communicated through an orifice 66 formed in a rubber wall 63. According to this, since the upper and lower fluid chambers 64 and 65 are partitioned by the rubber wall 63, damping occurs in the vertical direction as shown in FIG. As shown in Figure 11b, the orifice 6
6, there was a problem in that almost no damping occurred because the movement of fluid through 6 was extremely small.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a fluid-filled bushing that can generate damping in two or more directions: vertical and lateral directions. In order to achieve the object, the present invention connects a pipe and a sleeve passed through the pipe in a radial manner with at least three rubber walls, and the pipe is connected in at least one fluid chamber of a fluid chamber partitioned into three or more chambers. The gist is that the orifices that communicate with the fluid chambers on both sides are opened separately.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional side view of the bush of the first embodiment, in which a sleeve 2 is passed through the center of the pipe 1, the sleeve 2 is wrapped around it, and an elastic rubber 3 is filled.
Three thick rubber walls 4, 5, 6 are extended radially around the inner circumference and baked to partition the inside of the pipe 1 into three fluid chambers 11, 12, 13 in the circumferential direction. In the illustration, one rubber wall portion 4 extends upward, and two rubber wall portions 5 and 6 extend diagonally downward to the left and right.

And orifice 2 in each rubber wall part 4, 5, 6
Adjacent fluid chambers 11, 1, 22, 23 are formed.
Communicate with comrades 12 and 13.

Both ends of the fluid-filled bushing are covered to seal fluid inside, the pipe 1 is fixed to the vehicle body frame, and a rod is passed through the sleeve 2 to connect a vibration source such as an engine to the sleeve 2.

In this way, the interior of the pipe 1 is radially partitioned into three fluid chambers 11 by the three rubber walls 4, and the adjacent fluid chambers 11 are communicated with each other by the three orifices 21, as shown in Fig. 2a. As shown, damping occurs in the vertical direction due to the left and right orifices 22, 23, and damping occurs in the lateral direction due to the three orifices 21, including the upper orifice 21, and of course, the damping occurs in the diagonal direction. Damping will similarly occur with displacement.

FIG. 3 shows a second embodiment, and in this embodiment, a thin rubber wall 7 is extended further downward to partition the lower fluid chamber into two left and right chambers 14 and 15, which are formed in the rubber wall 7. Both fluid chambers 1 are connected by the orifice 24.
4 and 15 are connected.

If four fluid chambers 11 are defined in this way and the fluid chambers 11 are communicated with each other, damping will occur even in displacements in more directions, and of course it is possible to define five or more chambers and communicate with each other. By doing so, it is possible to further generate damping by following displacement in multiple directions.

Further, unlike the third embodiment shown in FIG. 4, it is not necessary to form an orifice in one rubber wall 5 (the one on the left in the figure) among the four rubber walls 4. According to this, It is possible to optimize damping and dynamic springs.

FIG. 5 shows a fourth embodiment. In this embodiment, in addition to the same configuration as the first embodiment, the inner circumference of the pipe 1 is connected to the elastic rubber 3 in the upper left and right fluid chambers 11, 13. Stopper rubber 31, 33 baked
and an integrated stopper rubber 32 is made to face into the lower fluid chamber 12 from a continuous portion with the left and right rubber walls 5 and 6, thus providing a stopper function.

FIG. 6 shows a fifth embodiment. In this embodiment, in addition to the same configuration as the first embodiment, a rubber wall portion 4 is inserted into each fluid chamber 11 from the opening edge of each orifice 21. Continuous rubber pieces 36, 37, 38 are faced, and these rubber pieces 36, 37, 38 are provided as one-way valves in the same circumferential direction. According to this, it is advantageous to improve the damping property in the low frequency range.

FIG. 7 shows a sixth embodiment. In this embodiment, there are one thick and thin rubber wall portions 4 on the upper and lower sides, respectively.
7 is extended, and two thick rubber wall portions 5 and 6 are also extended diagonally downward to the left and right, no orifice is formed in each rubber wall portion 4, and four bypass passages 41 are attached to the outer periphery of the pipe 1. Adjacent fluid chambers 11 at 44...
are communicated with each other, and solenoid valves 51...54 are placed inside the orifices 46...49, respectively, and the orifices 46...54 are connected to each other by the solenoid valves 51...54.
It is configured to control communication and cutoff of 49.

If such fluid-filled bushings are laid out, for example, at the front and rear of a transversely mounted engine, and the load direction of the engine is set at the bottom in the figure, the upper and lower valves 51 and 54 will be operated during a sudden stop, and the upper and lower orifices 46,
By blocking 49, high damping is obtained,
This prevents the engine from shaking in the longitudinal direction.
Furthermore, when shifting, the left and right valves 52, 53 are operated to shut off the left and right orifices 47, 48, thereby preventing vertical vibration of the engine caused by shifting.

FIG. 8 shows a seventh embodiment. In this embodiment, two thick rubber walls 5, 6 extend diagonally downward to the left and right, and two thin rubber walls 8, 9 extend diagonally upward to the left and right. Extend the orifice 2 to each rubber wall 5...
2...26, thus 4 in the vertical direction
If all the rubber walls 5 of the book are inclined, a large vertical stroke can be ensured.

Furthermore, FIG. 9 shows an eighth embodiment, and in this embodiment, in substantially the same configuration as the first embodiment, thin parts 5a and 6a are formed in the middle parts of the left and right rubber wall parts 5 and 6, The thin portions 5a and 6a are configured to provide damping in the rotational direction.

As is clear from the above description, according to the fluid-filled bushing of the present invention, the fluid chamber is partitioned into three or more chambers by a rubber wall, and at least one fluid chamber is provided with separate orifices that communicate with the fluid chambers on both sides thereof. Because it is open, damping can be generated in two or more directions, such as vertically and horizontally, making it highly practical.

The length of each orifice can be determined separately. Therefore, the magnitude of damping in the input direction of the load can be freely set, and the degree of freedom in design can be improved.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional side view of a bushing showing the first embodiment of the present invention, Figs. 2 a and b are explanatory diagrams of each function, and Figs. FIG. 10 is a vertical side view of a conventional bushing, and FIGS. 11a and 11b are explanatory views of each function. In the figure, 1 is a pipe, 2 is a sleeve, 4...9 is a rubber wall, 11...15 is a fluid chamber, 21...49 is an orifice, 31...33 is a stopper rubber, 36...3
8 is a valve rubber piece, and 51...54 are solenoid valves.

Claims (1)

[Scope of utility model registration request] Pass the sleeve inside the pipe and partition the internal fluid chamber with a rubber wall that connects the pipe and sleeve.
In a fluid-filled bush in which fluid chambers are communicated through an orifice, the pipe and the sleeve are radially connected by at least three rubber walls to partition the fluid chambers into three or more fluid chambers, and at least one fluid chamber has two or more fluid chambers on both sides thereof. A fluid-filled bushing characterized in that orifices each communicating with a fluid chamber are opened separately.