JPH0433478Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to a fluid-filled vibration isolating support, and in particular, the invention is based on the movement of a movable plate disposed within a partition mechanism that partitions a pressure receiving chamber and an equilibrium chamber. The present invention relates to an improvement of a fluid-filled vibration-proof support body designed to effectively block vibrations.

(Prior art) In vehicles such as automobiles, the engine and When installing a power unit in which an engine and a transmission are integrated (hereinafter collectively referred to as the power unit) to the vehicle body, a vibration-proof support with a vibration-proofing function is installed between the power unit and the vehicle body. Physical intervention is being carried out.
By blocking or attenuating the vibrations input between the power unit and the vehicle body based on the vibration-proofing function of the vibration-proofing support, good riding comfort (comfort) and good handling stability are achieved. Efforts are being made to ensure that

By the way, such a vibration isolation support is required to exhibit a good damping effect against input vibrations in a relatively low frequency range (generally large amplitude), while it is required to exhibit a good damping effect against input vibrations in a relatively high frequency range (generally large amplitude). In recent years, as it is generally required to exhibit a good transmission force blocking effect for small amplitudes,
In Japanese Patent Application Laid-Open No. 57-9340, etc., two fluid chambers (a pressure receiving chamber and an equilibrium chamber) containing an incompressible fluid are provided inside a device equipped with a rubber elastic body, and an orifice that communicates these fluid chambers is disclosed. is provided so that the incompressible fluid can flow through the orifice when low frequency vibration is input, and a movable plate that can move a small distance in the vibration transmission direction is provided in the partition mechanism that partitions the fluid chambers, A so-called fluid-filled type has been proposed in which the fluid pressure generated in the fluid chambers when high-frequency vibrations are input is absorbed by the movement of a movable plate. According to such a fluid-filled vibration isolation support, it is possible to obtain a good damping effect for input vibrations in the low frequency range based on the flow resistance of the incompressible fluid flowing through the orifice. Regarding input vibrations in the high frequency range, the fluid pressure generated in the fluid chamber is absorbed by the movement of the movable plate, and a good vibration isolation effect can be obtained based on the elastic deformation of the rubber elastic body. be.

(Problem) However, although such conventional fluid-filled vibration damping supports can exhibit an excellent vibration damping function as described above, the movable plate usually has a partition mechanism made of metal. The moving end position of the movable plate is regulated by contacting the partition wall of the partition mechanism, so vibration ( There were problems with noise (noise) and fluttering of the movable plate. In order to cope with this problem, a rubber elastic plate is generally used as the movable plate, but the reality is that even with this, the occurrence of vibrations cannot be sufficiently suppressed.

(Solution) The present invention was developed against the background of the above, and its main points are (a) a rubber elastic body located between the power unit and the vehicle body; (b) a pressure receiving chamber provided in contact with the rubber elastic body and containing a predetermined incompressible fluid into which vibrations to be damped are input; and (c) a pressure receiving chamber provided adjacent to the pressure receiving chamber. (d) an equilibrium chamber containing a predetermined incompressible fluid similar to the pressure receiving chamber, which allows the volume of the pressure receiving chamber to change; A space is arranged so as to be partitioned and has a substantially constant gap therein that extends in a direction substantially perpendicular to the direction of vibration transmission, and a partition wall defining the space defines the space between the equilibrium chamber and the pressure receiving chamber. (e) a rubber elastic plate of a predetermined thickness that is housed in a cavity of the partition mechanism and is movable a predetermined distance in the vibration transmission direction; In the fluid-filled vibration isolating support that allows the rubber elastic body to be easily elastically deformed by moving the rubber elastic plate in the vibration transmission direction, each side of the rubber elastic plate has a In addition to providing a tapered buffer protrusion,
A buffer protrusion provided on one surface of the rubber elastic plate and a buffer protrusion provided on the other surface of the rubber elastic plate are configured to be at different positions in a projected view in the vibration transmission direction, and the rubber elastic The shock generated when the plate abuts against the partition wall of the cavity is alleviated by the elastic deformation action of the buffer protrusion.

Note that the pressure receiving chamber and the equilibrium chamber are usually communicated through a predetermined orifice in order to improve the damping effect against low frequency vibrations.

(Function/Effect) According to such a fluid-filled vibration isolation support, input vibrations in the high frequency range can be effectively blocked by the movement of the rubber elastic plate, similar to the conventional one.
Moreover, the impact when the rubber elastic plate (movable plate) comes into contact with the partition wall of the partition mechanism is alleviated by the elastic deformation of the tapered buffer protrusion. Since the elastic modulus against the pressing force gradually increases, in addition to the fact that a rubber elastic plate is used as the movable plate, vibration (noise) caused by the contact between the plates increases, especially when starting the engine. This makes it possible to effectively suppress the occurrence of fluttering when stopped.

In addition, the movable plate is easily deformed because it is made of a rubber elastic plate, since the buffer protrusions provided on both sides of the movable plate are arranged at different locations. The change in rigidity in the plane direction of the (rubber elastic plate) is reduced, that is, the decrease in rigidity of the part between the buffer protrusions of the movable plate is suppressed, and the deformation of that part is alleviated, thereby reducing the vibration caused by the resonance of the movable plate. It also has the advantage that malfunctions are less likely to occur.

(Example) Hereinafter, in order to clarify the present invention more specifically, one example thereof will be described in detail based on the drawings.

First, in FIG. 1, reference numeral 10 denotes a rubber block as a rubber elastic body, which has a downwardly opening recess 12, and is integrally vulcanized and bonded to an upper support fitting 14 on its upper surface. At the same time, a bag-shaped metal fitting 16 is installed at the opening periphery of the recess 12.
It is integrally vulcanized and bonded to the inner peripheral surface of the opening.

An upper mounting bolt 18 is provided on the upper support fitting 14 so as to protrude upward. Further, the bag-like metal fitting 16 includes a bottom metal fitting 20 having a bottom cylindrical shape and a substantially cylindrical caulking metal fitting 22 which is caulked and fixed to the opening of the bottom metal fitting 20.
The lower mounting bolt 24 is located at the bottom of the bottom metal fitting 20 and projects downward. The anti-vibration support of this embodiment is attached to a vehicle body side member (not shown) using the lower mounting bolt 24, and is attached to a power unit side member (not shown) using the upper mounting bolt 18. This allows the power unit to be supported against the vehicle body.

On the other hand, the opening of the bag-shaped fitting 16 is connected to the rubber block 1.
A diaphragm 26 made of a thin rubber film is placed in the space formed by closing the caulking fitting 22 in a fluid-tight manner to close the lower opening of the caulking fitting 22.
is provided, thereby forming a sealed space between the diaphragm 26 and the rubber block 10. Further, a partition mechanism 28 is disposed between the diaphragm 26 and the rubber block 10 so as to divide the sealed space therebetween into two vertically. A pressure receiving chamber 30 is formed between the partition mechanism 28 and the diaphragm 26, and an equilibrium chamber 32 is formed between the partition mechanism 28 and the diaphragm 26. A predetermined incompressible fluid such as water, alkylene glycol, polyalkylene glycol, silicone oil, or a low molecular weight polymer is sealed in the pressure receiving chamber 30 and the equilibrium chamber 32.

The partition mechanism 28 that partitions the pressure receiving chamber 30 and the equilibrium chamber 32 is composed of an orifice forming member 36 and a partition member 38 which are stacked on top of each other, and is located between them. It has a movable plate accommodation space 40 with a predetermined gap perpendicular to the opposing direction. A circular rubber elastic plate 42, which is a movable plate, is positioned within the movable plate accommodation space 40 and is movable over a small distance in the direction facing the pressure receiving chamber 30 and the equilibrium chamber 32, that is, in the vibration transmission direction. It is accommodated.

As is clear from FIG. 2, the orifice forming member 36 includes a disk-shaped through hole forming part 46 having a plurality of through holes 44, and an outer periphery provided on the outer periphery of the through hole forming part 46. It consists of a thick groove forming part 50 having a groove 48 of a predetermined length extending in the circumferential direction on the surface. An outward flange portion 52 is fitted into the inner peripheral surface of the caulking fitting 22 on the outer peripheral surface of the groove forming portion 50 and is formed at the lower end of the groove forming portion 50.
is sandwiched between the caulking metal fitting 22 and the bottom metal fitting 20.

On the other hand, the partition member 38 is the orifice forming member 3
A disk-shaped through hole forming portion 54 corresponding to the through hole forming portion 46 of No. 6, and a disk-shaped through hole forming portion 54 extending from the outer circumference of the through hole forming portion 54 along the lower surface of the groove forming portion 50 of the orifice forming member 36. It consists of a clamped part 56 and an orifice forming member 3 on the equilibrium chamber 32 side.
6, and similarly to the orifice forming member 36, the clamped portion 56 is sandwiched between the caulking metal fitting 22 and the bottom metal fitting 20. As a result, the movable plate accommodation space 40 is formed between the through hole forming portion 46 of the orifice forming member 36 and the through hole forming portion 54 of the partition member 38. Movable plate storage space 4
The rubber elastic plate 42 is disposed within the range 0.

Note that a through hole 58 is formed in the through hole forming portion 54 of the partition member 38 in the same arrangement form as the through hole 44 formed in the through hole forming portion 46 of the orifice forming member 36, and a through hole 58 is formed in the through hole forming portion 54 of the partition member 38. The fluid pressure of these through holes 5
8 to act on the rubber elastic plate 42.

Further, as shown in FIGS. 1 and 2, the groove 48 formed in the groove forming portion 50 of the orifice forming member 36 has a pressure receiving chamber 30 and an equilibrium chamber 32 at both ends in the circumferential direction. This allows these pressure receiving chambers 3 to communicate with each other.
0 and the incompressible fluid contained within the balance chamber 32 are allowed to flow into each other through the space within the groove 48. That is, in this embodiment, the space within the groove 48, that is, the space formed by closing the opening of the groove 48 with the caulking fitting 22, is the orifice 60 that communicates the pressure receiving chamber 30 and the equilibrium chamber 32. It is said that

In this embodiment, in such a fluid-filled vibration damping support, as shown in detail in FIGS. 3 and 4, a predetermined section is provided at the center of the rubber elastic plate 42. A through hole 62 with a large area is formed, and on both sides of the rubber elastic plate 42,
A plurality of protrusions 64 serving as buffer protrusions each have a predetermined height and are formed concentrically around the center of the through hole 62, that is, the rubber elastic plate 42.

As shown in FIG. 4, the protrusions 64 on both sides of the rubber elastic plate 42 are arranged alternately in the radial direction of the rubber elastic plate 42, in other words, at different positions in the projection view in the vibration transmission direction. It is formed to be. In addition, those rubber elastic plates 4
The protrusions 64 on both sides of 2 are tapered as a whole and have the same cross-sectional shape, and when the rubber elastic plate 42 is in the center position of the movable plate accommodation space 40, the tips of the protrusions 64 are connected to the orifice forming member. 36 and the through hole forming portion 54 of the partition member 38 (hereinafter simply referred to as the through hole forming portions 46, 5
4) is formed with a height that is in contact with the plate surface. Furthermore, as shown in FIGS. 2, 4, and 5, the protrusions 64 and the through holes 62 are arranged so that when the rubber elastic plate 42 is at an intermediate position in the movable plate accommodation space 40, Each through hole forming part 4
Any of the through holes 44 and 58 formed in the through holes 6 and 54 are positioned to communicate through the through hole 62, and the rubber elastic plate 42 is connected to the through hole forming portion 4.
When the through hole 62 is in close contact with one of the through hole forming portions 46 and 54, the opening of the through hole 62 is formed in such a position that it is closed by the plate surface of the through hole forming portions 46 and 54, respectively.

In such a fluid-filled vibration isolating support, when vibrations in a low frequency range (generally large amplitude) are input to the pressure receiving chamber 30 through the rubber block 10, the vibrations accommodated in the pressure receiving chamber 30 and the equilibrium chamber 32 are Compressible fluids are allowed to flow through the orifice 60, and input vibrations are effectively damped based on the flow resistance.
On the other hand, when vibrations in a high frequency range (generally small amplitude) are input to the pressure receiving chamber 30, fluid pressure will be generated within the pressure receiving chamber 30 or the equilibrium chamber 32 in response to the vibration input. Since the fluid pressure is absorbed by the movement of the rubber elastic plate 42 in the vibration transmission direction within the movable plate accommodation space 40, a good vibration isolation effect can be obtained based on the elastic deformation action of the rubber block 10. .

In other words, according to the fluid-filled vibration isolating support of this embodiment, a good damping effect is achieved for input vibrations in the low frequency range based on the flow resistance of the incompressible fluid flowing through the orifice 60, and a good damping effect is achieved for input vibrations in the high frequency range. Based on the movement of the rubber elastic plate 42, a good isolation effect can be obtained against the input vibration in the range, and therefore, it is possible to obtain a good vibration-proofing function as a vibration-proofing support for supporting the power unit in a vibration-damping manner. It can be done.

Moreover, according to the vibration-proof support of this embodiment, tapered protrusions 6 are provided on both sides of the rubber elastic plate 42.
4 is formed, and when the rubber elastic plate 42 is moved, the protrusions 64 first come into contact with the through hole forming portion 46 or 54 which is the partition wall of the partition mechanism 28, and then the plate surface of the rubber elastic plate 42 contacts them. Since the through-hole forming portions 46 and 54 are in contact with each other, the shock generated when the rubber elastic plate 42 and each of the through-hole forming portions 46 and 54 come into contact is caused by the elastic deformation of the protrusions 64. This has the advantage of reducing the vibration (noise) caused by their contact.
This has the advantage that the generation of vibrations, especially when the engine is started and stopped, can be suppressed well, and that it is possible to sufficiently absorb the knocking sound caused by the fluttering of the rubber elastic plate 42.

Furthermore, according to the vibration-proof support of this embodiment, the protrusions 64 provided on both sides of the rubber elastic plate 42,
are placed at different positions so as not to overlap each other in the vibration transmission direction.
Since the rigidity of the region between the protrusions 64 of the rubber elastic plate 42 is increased and the change in rigidity of the rubber elastic plate 42 in the surface direction is reduced, malfunction occurs due to resonance of the rubber elastic plate 42 as a movable plate. There are also significant benefits.

Further, in this embodiment, as described above, the through holes 62 are formed in the rubber elastic plate 42, and when the rubber elastic plate 42 is in the intermediate position of the movable plate accommodation space 40, each through hole forming portion 46, 54 Through hole 4 formed in
4 and 58 are made to communicate with each other through the through holes 62, the vibrations can be suppressed more favorably against input vibrations in the high frequency range than in the case where such through holes 62 are not provided. It also has the advantage of providing a blocking effect. This is the through hole 62
Due to the flow of the incompressible fluid through the incompressible fluid, an effect similar to that caused by the movement of the rubber elastic plate 42, that is, the fluid pressure generated in the pressure receiving chamber 30 or the equilibrium chamber 32 is absorbed by the flow of the incompressible fluid. This is because if you do so, you will get the desired effect. Note that the through holes 62 formed in the rubber elastic plate 42 are formed in the through hole forming portions 46 and 5, as described above.
4. When it comes in close contact with one side of the
When a vibration is input, no incompressible fluid flows through the through hole 62, and the vibration damping effect is likely to decrease due to the incompressible fluid flowing through the through hole 62. Nothing.

Although one embodiment of the present invention has been described above, this is a literal illustration, and it goes without saying that the present invention should not be interpreted as being limited to this specific example.

For example, in the embodiment described above, the protrusions 64 formed on both sides of the rubber elastic plate 42 are connected to the through hole forming portions 46 facing each other when the rubber elastic plate 42 is at the center position of the movable plate accommodation space 40. , 54, the height of the protrusion 64 is not limited to such a height, and may be higher or lower than that. Further, the height of each protrusion 64 does not necessarily have to be constant. Moreover, those protrusions 64 are
As shown in FIGS. 6 and 7, the rubber elastic plates 42 are formed in different sizes so that those provided on one side of the plate 42 are larger than those provided on the other side. It is also possible to adopt an appropriate cross-sectional shape, such as a more gently tapered shape at the hem as shown in FIG. In addition, in FIG. 7, 66 is a recess formed corresponding to the protrusion 64.

Further, in the above embodiment, each of the protrusions 64 was formed concentrically and annularly around the center of the rubber elastic plate 42, but these protrusions 64 do not necessarily have to be annularly formed. They may be formed intermittently as shown in FIG. 9, or may be formed spirally or radially as shown in FIGS. 10 and 11. be. Furthermore, the buffer projections do not necessarily have to be formed as protrusions 64 having a predetermined length, and may be formed by forming a large number of projections regularly or irregularly. Of course, these protrusions 64 and protrusions are connected to the rubber elastic plate 4.
When providing on both sides of 2, as in this example,
It goes without saying that it is necessary to provide them so that they are offset on both sides, in other words, at different positions in a projected view in the vibration transmission direction (for example, in the vertical direction in FIG. 1).

Furthermore, in the embodiment, a through hole 62 is formed in the center of the rubber elastic plate 42, and the incompressible fluid flows through the through hole 62 when the rubber elastic plate 42 is at an intermediate position in the movable plate housing space 40. Based on the fact that the incompressible fluid flows through the through hole 62, a better vibration isolation effect against vibration input in the high frequency range can be obtained. The formation position of the through hole 62 is not necessarily limited to the central part of the rubber elastic plate 42, but as shown in FIG.
It is also possible to form it at a position away from the center of the rubber elastic plate 42. However, when forming the through holes 62 at a position away from the center of the rubber elastic plate 42, as shown in the figure, a plurality of through holes 62 are formed around the center of the rubber elastic plate 42. It is desirable to form them substantially uniformly. Also, in this case, each through hole 62
It is desirable to form the rubber elastic plate 42 at a position where the opening is closed by the plate surface of the through-hole forming portions 46, 54 when the rubber elastic plate 42 is brought into close contact with one of the through-hole forming portions 46, 54. Note that the cross-sectional area and cross-sectional shape of these through holes 62 can be changed as appropriate depending on the situation. Moreover, such a through hole 62 does not necessarily need to be formed.

Further, in the embodiment described above, a part of the equilibrium chamber 34 is defined by a flexible membrane (diaphragm 26), and the pressure receiving chamber 30 is changed by changing the volume of the equilibrium chamber by deforming the flexible membrane. Although we have described an example in which the present invention is applied to a fluid-filled vibration isolating support of a type that allows a change in volume, the present invention is not limited to this. It can also be applied to a type defined by a thick rubber elastic body, and it can also be applied to a type where the pressure receiving chamber and the equilibrium chamber are not communicated through an orifice. It is.

Although not listed in detail, it goes without saying that the present invention can be implemented with various changes, modifications, improvements, etc. without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view (-cross-sectional view in FIG. 2) showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view (-cross-sectional view) thereof. FIG. 3 is a plan view showing the rubber elastic body of the embodiment shown in FIG. 1. Figure 4 is the first
FIG. 2 is a cross-sectional view showing an enlarged main part of the embodiment shown in the figure;
FIG. 5 is a diagram corresponding to FIG. 4 in an operating mode different from that in FIG. 1 of the embodiment of FIG. 1. 6th
7 and 8 are sectional views of main parts showing rubber elastic bodies of other embodiments of the present invention, respectively.
Figures 9, 10, 11 and 12 are
FIG. 4 is a diagram corresponding to FIG. 3 showing a rubber elastic body according to another embodiment of the present invention; 10...Rubber block (rubber elastic body), 14...
... Upper support fitting, 16 ... Bag-shaped metal fitting, 26 ... Diaphragm, 28 ... Partition mechanism, 30 ... Pressure receiving chamber, 32 ... Equilibrium chamber, 36 ... Orifice forming member, 38 ... Partition wall member, 40 ... ...Movable plate accommodation space, 42...Rubber elastic plate, 44, 58...Through hole (of the partition mechanism), 46, 54...Through hole forming part (partition wall), 60...Orifice, 62...Through hole ( ), 64... protrusion (buffer protrusion) of the rubber elastic plate.

Claims (1)

[Scope of Claim for Utility Model Registration] An anti-vibration support that is interposed between a power unit and a vehicle body to provide anti-vibration support for the power unit with respect to the vehicle body, and between the power unit and the vehicle body. a pressure receiving chamber provided in contact with the rubber elastic body and containing a predetermined incompressible fluid into which vibrations to be damped are input; and a pressure receiving chamber provided adjacent to the pressure receiving chamber. an equilibrium chamber that accommodates a predetermined incompressible fluid similar to the pressure receiving chamber, and is located between the equilibrium chamber and the pressure receiving chamber to partition them. A space is disposed therein and has a substantially constant gap extending in a direction substantially perpendicular to the vibration transmission direction, and a partition wall defining the space communicates the space with the equilibrium chamber and the pressure receiving chamber. a partitioning mechanism each having a through hole, and a rubber elastic plate having a predetermined thickness that is housed in a cavity of the partitioning mechanism and is movable a predetermined distance in the vibration transmission direction; In the fluid-filled vibration isolating support that allows the rubber elastic body to be easily elastically deformed by movement in the vibration transmission direction, tapered buffer protrusions are provided on both sides of the rubber elastic plate. and configured so that the buffer protrusions provided on one surface of the rubber elastic plate and the buffer protrusions provided on the other surface of the rubber elastic plate are at different positions from each other in a projected view in the vibration transmission direction, A fluid-filled vibration damping support body, characterized in that the shock generated when the rubber elastic plate abuts against the partition wall of the cavity is alleviated by the elastic deformation action of the buffer protrusion.