JP3547478B2 - Fluid-filled anti-vibration support device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a fluid-filled anti-vibration support device used for an engine mount or the like of an automobile.
[0002]
[Prior art]
This type of fluid-filled anti-vibration support device has a characteristic that the higher the frequency of input vibration, the higher the spring constant. This is considered to be because if the frequency increases, the orifice passage communicating between the fluid chambers becomes clogged, and the presence of the fluid rather causes the hardness of the spring. Therefore, if this state is maintained, the transmission rate of the medium-frequency vibration generated during running of the vehicle increases, and the problem of vehicle interior noise occurs.
[0003]
For this reason, a device that does not increase the spring constant even at a medium-high frequency vibration is required, and the present applicant has responded to this demand by providing a protruding body that protrudes from the inner cylinder into the fluid chamber and that has a certain gap. A case in which a recessed pot is provided is disclosed in Japanese Patent Application No. 1-00231 and Japanese Patent Application Laid-Open No. 5-164184. It has been confirmed that the gap between the protruding body and the recessed pot forms an escape field for the fluid, and as a result, the resonance of the fluid occurs and the rise of the spring constant is suppressed.
[0004]
[Problems to be solved by the invention]
However, in each of these cases, since the protruding body is integrally protruded from the inner cylinder, there is a disadvantage that the manufacturing die becomes complicated, the welding man-hours and the like are required, and the cost is increased. On the other hand, for the purpose of suppressing the outward expansion of the side wall of the main fluid chamber and increasing the amount of fluid movement, the present applicant has connected both side walls with a connecting band partially replaced with a mass body. The proposed case is proposed as Japanese Patent Application Laid-Open No. 5-081822. Therefore, the present invention has been found by combining these two cases and conducting various studies as to whether or not this problem can be solved, and finding that this can be achieved by applying a certain device to the connecting band and the recessed pot.
[0005]
[Means for Solving the Problems]
According to the present invention, a rubber elastic cylinder having two side walls perpendicular to the cylinder axis and a partition wall including both the inner cylinder and being cross-linked in parallel to the cylinder axis is provided between the inner cylinder and the outer cylinder. The main fluid chamber is filled with an incompressible fluid in the space divided into two by the side wall and the partition wall to make the main fluid chamber and the slave fluid chamber. A connecting band of a rubber elastic material, a part of which is replaced with a mass body, is provided so that the main fluid chamber and the sub-fluid chamber are formed by orifice passages formed in an orifice structure fitted around the rubber elastic cylinder. In the fluid-filled anti-vibration support device, a mass having a predetermined gap with the connection band is integrally attached to the orifice structure on both sides of the connection band, and the gap is a spring. fluid, characterized in that it is intended to be adjusted according to the frequency to be suppressed in order to suppress the increase of constant Is obtained by providing Irigata vibration isolation support system.
[0006]
[Action]
By taking the above measures, vibration naturally change the volume master-slave fluid chamber with the input, fluid compressed fluid chamber flows into a fluid chamber which is expanded through the orifice passage, at this time The fluid in the main fluid chamber can also flow in the fluid chamber through the gap between the connection band and the mass, which manifests a so-called softness of the spring and suppresses an increase in the spring constant. In order to make this possible, it can be achieved by arranging a lump having a certain gap with the connecting band integrally on the orifice structure on both sides of the connecting band. Reduce costs.
[0007]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a fluid-filled anti-vibration support device according to the present invention, FIG. 2 is a vertical cross-sectional view, and FIG. 3 is a side view of the fluid-filled anti-vibration support device with the outer cylinder and orifice structure removed. The vibration support device is provided between a metal inner cylinder 10 and an outer cylinder 12 arranged concentrically or eccentrically in parallel, two side walls 14 perpendicular to the cylinder axis, and both side walls 14 including the inner cylinder 10. A rubber elastic cylinder 18 having a partition 16 bridging in parallel with the cylinder axis is stretched between them. In the vicinity of the outer periphery of the rubber elastic cylinder 18, a metal reinforcement bridging between the side walls 14 by cutting out a part of the space portions 20, 22 which are vertically separated by the side wall 14 and the partition wall 16. The ring 24 is wound.
[0008]
An incompressible fluid is sealed in the spaces 20, 22, and the lower one is the main fluid chamber 20 and the upper one is the sub-fluid chamber 22, and the main fluid chamber 20 and the sub-fluid chamber 22 are connected to the orifice passage 26. Is communicated with. The bottom wall 28 of the sub-fluid chamber 22 is formed of a thin diaphragm having a penetrating portion 30 between the sub-fluid chamber 22 and the partition wall 16 so as to be easily deformed and to facilitate the movement of the fluid. Further, the central portion of the bottom wall 28 (in the direction in which the static load is received) bulges until a part of the outer side comes into contact with the outer cylinder 12, and an inwardly protruding lump 32 is formed in the space 30. And serves as a stopper when the inner cylinder 10 is excessively displaced upward.
[0009]
A reinforcing ring 24 bridges between both side walls 14 on the outer peripheral side at the center of the main fluid chamber 20, and a crosslinked body 34 of a rubber elastic material slightly protruding toward the inner cylinder 10 is also formed integrally therewith. Have been. In the middle of the center of the main fluid chamber 20, a connecting band 36 made of a rubber elastic material for connecting the side walls 14 is provided in parallel with the cylinder axis. Note that a mass body 38 such as a metal body is sealed in the connection band 36. The connecting band 36 prevents the side wall 14 from expanding outward when the main fluid chamber 20 is compressed, and also serves as a stopper when the inner cylinder 10 is excessively displaced downward in cooperation with the bridge body 34. Things. Further, the mass body 38 also functions as a dynamic damper, and contributes to an improvement in vibration isolation performance.
[0010]
The main fluid chamber 20 and the sub-fluid chamber 22 communicate with each other through an orifice passage 26. The orifice passage 26 of this example is formed in the following orifice structure 40. 4 is a bottom view of the orifice structure 40, FIG. 5 is a side view, FIG. 6 is a cross-sectional view showing a state in which the orifice structure 40 is mounted on the rubber elastic tube 18, and FIG. 7 is a side view after mounting. The orifice structure 40 is a semicircular ring of a composite of metal and rubber elastic material fitted on the outer periphery of the reinforcing ring 24 and the bridge 34 in the main fluid chamber 20, and the orifice passage 26 is formed on the outer periphery. It was formed. The orifice structure 40 may be formed of a resin molded product.
[0011]
However, the orifice passage 26 is composed of a reciprocating passage that emerges from one end, turns at the other end, and returns to the one end again. The orifice passage 26 is designed to increase the flow resistance by increasing the length of the flow passage and to enhance the damping performance. A hole 42 is formed at the last end of the return path on one end side, and communicates with the main fluid chamber 20. Further, a groove 44 communicating with the orifice passage 26 of the outgoing passage is formed in the partition wall 16 and communicates with the slave fluid chamber 22.
[0012]
In the present invention, in the main fluid chamber 20, a mass of rubber elastic material 46 is integrally attached to a metal or rubber composite orifice structure 40 by vulcanization bonding or the like on both sides of the connection band 34 and arranged. . The block 46 is slightly taller than the connecting band 36, and a certain gap 48 is secured between the block 46 and the connecting band 36. The mass 46 and the orifice structure 40 may both be made of resin, in which case they may be integrally formed.
[0013]
As described above, when the outer cylinder 12 is now fixed and the inner cylinder 10 is connected to the vibrating body, the inner cylinder 10 itself vibrates due to the vibration. At this time, the volume changes in the master and slave fluid chambers 20 and 22 and the fluid Move and the vibration is damped. At the same time, the transmission of vibration is interrupted by the rubber elastic cylinder 18, and the vibration isolating support device is excellent in both damping and vibration isolation. When the displacement is excessive, the mass 32, the connecting band 36, and the bridge 34 function as stoppers.
[0014]
At this time, since the gap 48 is provided between the connecting band 36 and the mass 46, the gap 48 serves as a refuge for the fluid to generate resonance in the fluid, thereby suppressing an increase in the spring constant. FIG. 9 shows a frequency-absolute spring constant curve in the vertical direction (static load direction) between the presence and absence of the block 46, and FIG. 10 shows a frequency-absolute spring constant curve in the front-rear direction (axial direction). As can be seen from this, the presence of the lump 46 suppresses an increase in the absolute spring constant in the high frequency range from before 500 Hz. Rises sharply). As a result, in-vehicle noise and the like are cut, and a comfortable ride is obtained.
[0015]
Then, by adjusting the gap 48, the peak position of the spring constant with respect to the frequency can be changed, and this serves as a tuning element, thereby widening the tuning range. Further, the mass 46 also serves as an auxiliary stopper that assists the function of the stopper.
[0016]
On the other hand, in the fluid-filled anti-vibration support device according to the present invention, the thickness of the side wall 14 of the main fluid chamber 20 on the inner cylinder 10 side may be thick in the load direction and thin on the side deviating from the load direction. FIG. 8 is a cross-sectional view taken along the line AA of FIG. 1, which shows the same, and is thinned by, for example, digging the meat on the side deviating from the load direction, that is, the position deviating from the projection surface of the inner cylinder 10.
[0017]
Naturally, the static load direction (vertical direction) must support the weight of the vibrating body, so its spring constant must be increased. However, the other horizontal direction, front and rear (cylinder axis) direction (of course, vibration in this direction) This is because the smaller the spring constant is, the better from the standpoint of vibration isolation. In this respect, the volume of the main fluid chamber 20 is not reduced, and the damping is reduced, as compared with the case where the space portion 30 formed in the rubber elastic cylinder 18 is inserted into the main fluid chamber 20 and the spring constant in the left, right, front and rear directions is reduced. It is meaningful to prevent performance degradation.
[0018]
【The invention's effect】
As described above, the present invention is as described above, that is, since a lump is provided with a fixed gap on both sides of the connecting band, this gap forms a kind of fluid refuge. Then, the resonance of the fluid is caused to suppress the rise of the spring constant, and the damping performance is also improved. And since this lump is integrally attached to the orifice structure, it is not necessary to machine the inner cylinder or the like, which facilitates the production and contributes to cost reduction. Further, since these gaps also serve as tuning elements for adjusting the spring constant, their widths are widened and the design becomes easier.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a fluid-filled anti-vibration support device.
FIG. 2 is a vertical cross-sectional view of a fluid-filled vibration-proof support device.
FIG. 3 is a side view of the fluid-filled anti-vibration support device with the outer cylinder and the orifice structure removed.
FIG. 4 is a bottom view of the orifice structure.
FIG. 5 is a side view of the orifice structure.
FIG. 6 is a cross-sectional view showing a state where the orifice structure is assembled to the rubber elastic cylinder.
FIG. 7 is a side view showing a state where the orifice structure is assembled to a rubber elastic cylinder.
FIG. 8 is a sectional view taken along the line AA of FIG. 1;
FIG. 9 is a vertical frequency-absolute spring constant curve.
FIG. 10 is a frequency-absolute spring constant curve in the front-rear direction.
[Explanation of symbols]
Reference Signs List 10 inner cylinder 12 outer cylinder 14 side wall 16 partition 18 rubber elastic cylinder 20 main fluid chamber (space)
22 Secondary fluid chamber (space)
26 orifice passage 36 connecting band 38 mass 40 orifice structure 46 lump 48 gap

Claims (2)

Between the inner cylinder and the outer cylinder, a rubber elastic cylinder having two side walls perpendicular to the cylinder axis, and a partition wall that includes the inner cylinder and is bridged in parallel to the cylinder axis between both side walls including the inner cylinder, is stretched. In addition to filling the incompressible fluid into the space divided into two parts by the partition wall and the partition wall to form a main fluid chamber and a sub-fluid chamber, the main fluid chamber is bridged between both side walls in parallel to the cylinder axis. A fluid seal is provided in which a connecting band of rubber elastic material whose part is replaced by a mass body is provided, and a main fluid chamber and a sub-fluid chamber are communicated by an orifice passage formed in an orifice structure fitted to the outer periphery of the rubber elastic cylinder. In the type anti-vibration support device, on both sides of the connection band, a lump having a predetermined gap with the connection band is integrally attached to the orifice structure and arranged , and the above-mentioned gap increases the spring constant. fluid filled type vibration damping, characterized in that it is intended to be adjusted according to the frequency to be suppressed in order to suppress Lifting apparatus. The fluid-filled anti-vibration support device according to claim 1, wherein the orifice structure and the lump are integrally formed of resin.

Images