JPS6155429A - Vibration isolating supporter - Google Patents

Abstract

PURPOSE:To simplify the structure and to facilitate manufacture by constructing means for partitioning the operating chamber and the balancing chamber to be formed in a mount filled with fluid while overlapping two hat members thereby defining movable board containing space and annular space between both members. CONSTITUTION:A mesa type rubber block 2 having inner void is secured through vulcanization to the circumference of retainer 6 of fixing plate 4. While an annular supporting metal 14 is secured to the outercircumference at the bottom side of rubber block 2 thus to fix the partitioning means comprised of outside and inside hat members 16, 18 overlapped each other together with pan-type protection metal 26 and to seal the lower opening of rubber block 2. While a diaphragm 22 is provided at the opposite side from the operating chamber 20 defined by partitioning means thus to define the balancing chamber 24 between the partitioning means. Furthermore, an annular space 42 is defined between the bottomed tubular sections 34, 36 of said hat members 16, 18 and to contain a movable board 56 in a space between the bottom sections of said members 16, 18.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a vibration isolating support, and in particular to a fluid-filled elastic support that has excellent vibration isolating properties in high and low frequency ranges and is suitably used for automobile engine mounts. It is related to the support.

BACKGROUND TECHNOLOGY Conventionally, anti-vibration rubber mountings (vibration-isolating supports) for automobile engine mounts, body mounts, etc., have been used with a structure in which a rubber block is interposed between two metal fittings. However, when rubber with a small dynamic spring constant is used to reduce vibration noise in the high frequency range, the loss coefficient of such rubber is small, and therefore the damping coefficient is also small.
The characteristics required for the Defense 1 Dragon rubber mount were fully satisfied. However, anti-vibration rubber mounts such as engine mounts are equipped with low dynamic spring characteristics to reduce vibration and noise in the high frequency range (near 100 Hz), as well as low vibration characteristics in the low frequency range (near 15T-Iz). This is because it is required to have high damping characteristics (large loss coefficient) to reduce vibrations.

On the other hand, in order to meet such demands, various types of elastic supports, so-called fluid-filled mounts, have been proposed that utilize the elasticity of rubber and the flow resistance of fluid.
A damper device or an elastic buffer support proposed in JP-A No. 3-5376 and JP-A No. 57-934.0, etc., has a rubber elastic body provided on one side of a partition member, and the rubber elastic body is provided on one side of a partition member. A working chamber is defined in the body, and an equilibrium chamber surrounded by a flexible member such as a flexible thin film is formed on the other side of the partition member, and a predetermined amount of air is formed in the working chamber and the equilibrium chamber. While enclosing an incompressible fluid, the working chamber and the equilibrium chamber are communicated through an orifice, and a movable plate supported by the partition member is moved a predetermined distance by pressure applied to the fluid in the working chamber. This is provided so that an effective vibration damping effect can be exerted.

In other words, in general, in this type of fluid-filled mount, when high-frequency vibration is input, the fluid in the working chamber acts as a rigid body. Therefore, even if rubber with a low dynamic spring constant is used as the elastic body, the mount as a whole It was difficult to achieve an effective vibration reduction effect due to the high dynamic spring constant, but this can be effectively reduced by changing the volume inside the working chamber (absorbing fluid pressure) due to the movement of the movable plate. In addition, when low-frequency vibrations are input, the movable plate is prevented from moving freely, and the fluid flows from the working chamber to the equilibrium chamber through the orifice, thereby reducing the flow. By increasing the loss coefficient of the mount as a whole through the effects of resistance, etc., it is possible to effectively exhibit damping characteristics against low-frequency vibrations.

Problems As described above, the fluid-filled mounts using a movable plate proposed in JP-A-53-5376 and JP-A-57-9340 have cleverly solved the problems inherent in conventional fluid-filled mounts. However, in a fluid-filled mount with such a structure, the partition member that separates the working chamber and the equilibrium chamber must have an orifice to allow these chambers to communicate with each other. Since it is necessary to support the movable plate so that it can be moved a predetermined distance, the structure of such a partition member becomes extremely complicated. Attaching the mount makes workability complicated and troublesome, and furthermore, the shape of the partition member itself becomes large, resulting in the problem of increasing the size of the entire mount.

Moreover, the orifice that communicates the working chamber and the equilibrium chamber is formed inside a partition member made of a material such as resin or die-cast aluminum, and the thickness of the partition member (plate thickness) is made thicker in terms of its strength. For this reason, the thickness of the supporting portion at the peripheral edge of such a partition member becomes large.
There is also an inherent drawback that the shape of the partition support part of the product is large.

Solution The present invention has been made to solve the problems in the conventional fluid-filled mount using a movable plate, and is characterized by A rubber elastic body is provided to define an operating chamber within the rubber elastic body, and an equilibrium chamber is formed on the other side of the partition means by an enclosure at least partially made of a flexible thin film. A predetermined incompressible fluid is sealed in the chamber and the parallel chamber, while the working chamber and the equilibrium chamber are communicated through an orifice, and a movable plate supported by the partition means is added to the fluid in the working chamber. In a vibration-proof support structure that can be moved a predetermined distance by pressure,
(a) The partitioning means is formed by using an outer half part side and an inner hat member each having a hat shape consisting of a shallow bottomed cylindrical part and a flange part, and inserting them into the former bottomed cylindrical part. (b) the cylindrical wall of the bottomed cylindrical part of the outer hat member and the cylinder of the bottomed cylindrical part of the inner hat member; The orifice is formed by forming a circumferential annular space by providing a gap between the wall and the annular space, and communicating the annular space with the working chamber and the equilibrium chamber, respectively; A hollow space is provided between the bottom of the bottomed cylindrical part of the hat member and the bottom of the bottomed cylindrical part of the inner hat member, and the space is configured to accommodate the movable plate and move the movable plate a predetermined distance. A hole communicating with the working chamber and the equilibrium chamber is provided in the two bottom portions, and the pressure of the incompressible fluid in the working chamber is adjusted to the equilibrium through movement of a movable plate accommodated in the cavity. The reason is that it can be applied to the room side.

Therefore, in the structure according to the present invention, by simply overlapping the outer hat member and the inner hat member, which serve as partition means, the space in which the movable plate is accommodated,
The annular space constituting the orifice is formed at the same time, and the movable plate housing cavity and the annular space are formed in the bottomed cylindrical part of the hat member and are arranged so as to be located in the working chamber or the equilibrium chamber. As a result, the structure of the partitioning means can be extremely simplified, and the flange portion serving as the supporting portion thereof can also be made extremely thin.

In particular, in the present invention, it is preferable that the outer hat member and the inner hat member constituting the partitioning means are press-molded products of metal plate materials. By using fertilizer, the cost of fertilization can be significantly reduced.

The annular space in the circumferential direction formed by the gap between the cylindrical wall of the bottomed cylindrical portion of the outer hat member and the cylindrical wall of the bottomed cylindrical portion of the inner hat member is It is desirable that the annular space be closed (blocked) at the outer and inner hat members, and communication holes are provided in each of the outer and inner hat members so as to allow the annular space to communicate with the working chamber and the equilibrium chamber, respectively. Therefore, when the outer hat member and the inner hat member are overlapped, the length of the annular space between the communication holes provided in these two members can be arbitrarily selected by selecting the relative rotational position of these two members. This gives rise to the advantage that the length of the orifice can be set arbitrarily.

EXAMPLES Below, in order to clarify the present invention more specifically, examples of the present invention will be described in detail based on the drawings.

First, in FIG. 1 showing an example of an engine mount that is an embodiment of the present invention, 2 is a rubber block that is a rubber elastic body, and has a thick walled approximately truncated conical cylinder shape with a hollow space inside. The top end thereof is fixed to the fixed portion of the retainer 6 of the mounting plate 4 by integral vulcanization molding or the like. Further, in the center of the mounting plate 4, a take-out port 8 is erected with its threaded portion facing outward. Further, one side portion of the mounting plate 4 is bent into a substantially 7-shaped shape to form a hanging stopper portion 10. A stopper rubber 12 is fixed to the inside of this stopper portion 10 to a predetermined thickness.

On the other hand, on the bottom side of the lower end of the rubber block 2, an annular support fitting 14 is integrally fixed to the outer periphery of the rubber block 2 by vulcanization adhesive or the like. A partition means is disposed in which an outer hat member 16 and an inner hat member 18 made of metal plate material formed by processing are overlapped, and this partition means allows the downward opening force of the rubber block 2 to <2.
A working chamber 20 is formed inside the rubber block 2 by being tightly sealed at night.
is formed.

Moreover, in this way, the outer hat member 16 and the inner hull 1 to
A diaphragm 22 made of a thin rubber film is provided on the outside of the partition means constituted by the member 18, in other words, on the side opposite to the side on which the working chamber 20 is provided, and functions as an enclosure. An equilibrium chamber 24, which is a sealed space, is formed between the diaphragm 22 and the partition means.

The working chamber 20 and the equilibrium chamber 24 thus formed are filled with a predetermined incompressible fluid such as water or alkylene glycol. As the fluid flows into the balance chamber 24 from the chamber 20, the diaphragm 22 is bulged and deformed outward, so that the internal volume of the balance chamber 24 can be increased.

A plate-shaped protective fitting 26 is disposed further outside the diaphragm 22 to cover it, and a seal portion 28 formed continuously from the end of the rubber block 2 and the peripheral edge of the protective fitting 26 The outer peripheral edge of the support fitting 14 is caulked from the outermost side with the flanges of the overlapping outer and inner hat members 16 and 18 and the outer peripheral edge of the diaphragm 22 being sandwiched between them. As a result, each of these members is integrated with the rubber block 2, and the working chamber 20 and the equilibrium chamber 24 are kept liquid-tight. In addition, a mounting bolt 30 is provided at the center of the protective fitting 26.
is implanted with its threaded portion protruding outward. Although not shown, the protective fitting 26 is provided with an appropriate number of communication holes that allow the space between the protective fitting 26 and the diaphragm 22 to communicate with the outside. Further, a stopper metal fitting 32 is fixedly attached to a portion of the support metal fitting 14 corresponding to the stopper part 10 of the mounting plate 4 and hangs down, and due to interference between the stopper metal fitting 32 and the stopper part 10, In FIG. 1, excessive deformation in the left-right direction can be prevented.

By the way, in such an engine mount as a vibration-proof support, the working chamber 20 and the equilibrium chamber 24 are separated from each other by an outer hat member 16 and an inner hat member 18, each of which is made of a pressed metal plate +2. As is clear from FIGS. 2 to 6, the partitioning means is such that the bottomed cylindrical portion 36 of the inner hat portion +, 118 is fitted inside the bottomed cylindrical portion 34 of the outer hat portion H], 6. These members are overlapped in a packed state, and are fixed by spot welding or the like at a plurality of locations (for example, four locations) in the circumferential direction of the flange portions 38 and 40 where these members are overlapped.

Since the diameter of the bottomed cylindrical portion 34 of the outer hat member 16 is made larger than the diameter of the bottomed cylindrical portion 36 of the inner hat member 18, the bottomed cylindrical portion 34 of the outer hat member 16 is made larger by overlapping these two members. A predetermined gap is formed between the cylindrical portions 34 and 36, and an annular space 42 is formed in the circumferential direction.

As is clear from FIGS. 2 and 6, this annular space 42 has a cylindrical wall of the bottomed cylindrical portion 3 and 6 of the inner hat member 18 that protrudes laterally at one location in the circumferential direction. By forming the blocking protrusion 44, the bottomed cylindrical portion 34 of the outer hat member 1G of the blocking protrusion 44
The annular space 42 is partially cut off in the circumferential direction by contacting the inner surface of the cylinder wall.

Further, as is clear from FIGS. 2, 3, and 6, a rectangular communication hole 46 is bored in the side surface of the blocking protrusion 44, and a rectangular communication hole 46 is formed in the lower part of the partition means. Communication between the equilibrium chamber 24 and the annular space 42 is achieved. Furthermore, the bottomed cylindrical portion 3 of the outer hat member 16
A rectangular communication hole 48 is provided at a predetermined position on the outer peripheral edge of the bottom of the partition 4, and the working chamber 20 located above the partition means and the annular space 42 are communicated with each other by this communication hole 48. .

Therefore, the annular space 42 formed by the outer hat member 16 and the inner hat member 18, which are such partitioning means, and the communication holes 46 and 48 provided therein are arranged at a predetermined distance to allow the upper and lower working chambers 20 and equilibrium chambers 24 to communicate with each other. It constitutes the orifice of.

In addition, the second bottom part 50 of the outer handle (the bottom part of the bottomed cylindrical part 34 of P old A16 has a predetermined height and depth that protrudes further outward) has a diameter smaller than the diameter of the bottomed cylindrical part 34. and a plurality of working holes 52 are provided in the second bottom portion 50 thereof. Furthermore, a plurality of working holes 54 similar to the working holes 52 are provided in the bottom portion of the bottomed cylindrical part 36 of the inside hat part 4118 corresponding to the second bottom part 50 of the outside hatch part IG. It is being done.

Then, the inner hat member 1 is attached to the outer hat member 16.
By overlapping 8, the outer hat part 1
Due to the presence of the second bottom 50 of the outer hat member 6, a predetermined cavity is formed between the bottom of the outer hat member 6 and the bottom of the inner hat member 18, and a predetermined disc-shaped space made of rubber material is formed therein. A thick movable plate 56 is housed therein.

Accordingly, the movable Fj, 56 accommodated in the cavity formed between the two bottom parts, moves each navel member 16. ]
The working chamber 2o and the equilibrium chamber 24 are connected through the working holes 52 and 54 of 8.
Therefore, when the pressure of the incompressible fluid in the working chamber 20 is applied to the movable plate 56, the movable plate 56 is moved a predetermined distance, whereby the balance chamber 24 side This means that the pressure is transmitted to the Note that the movement of the movable plate 56 is as follows:
It is regulated by the second bottom portion 50 of the outer hat member 16 and the bottom portion of the inner hat member 18.

Therefore, in the engine mount having such a configuration, the mounting bolts 8 of the mounting plate 4 and the mounting bolts 3o of the protective fittings 26 are used to provide an intervening device between the vehicle body and the power unit in which the engine, transmission, etc. are integrated. The movable plate 56 and orifice (42,
52°54), it exhibits excellent low dynamic spring characteristics and high damping characteristics.

That is, when high frequency vibration is input, the operating vehicle 20
The pressure applied to the incompressible fluid inside is applied to the outside by a movable plate 56 housed in a space between the bottoms of the outer hat member 16 and the inner hat member 18 constituting the partition means so as to be movable a predetermined distance. The action is applied through the action hole 52 of the hat member 16, and as the action moves, it is transmitted to the equilibrium chamber 24 side through the action hole 54 of the inner hat member 18, thereby making effective use of the spring characteristics of the rubber block 2. As a result, the overall dynamic spring constant can be lowered, and vibration noise in the targeted high frequency range can be effectively reduced. On the other hand, when low frequency vibration is input, the orifice (42, 52, 5
4), an effective flow of the incompressible fluid contained in each chamber is induced between the working chamber 20 and the equilibrium chamber 24, and energy loss is generated due to such flow resistance, etc. By doing so, it is possible to obtain an effective large loss coefficient, and thereby to exhibit a high damping effect against low frequency vibrations.

In the engine mount I having such a structure, the partition means is constructed by overlapping two hat members 16 and 18, which are press-formed products formed by press working and punching. Its structure is extremely simplified, and its assembly is extremely easy because it is only necessary to overlay and fix them.

In addition, the two hat members 16 that are joined together in this way
．． 18, the overlapped flange portions 38, 4.0 are attached as shown in FIG.
Since it is fixed and supported together with the diaphragm 22 and the protective metal fitting 26, the shape of the support part poses problems such as the size becoming large, like the support part of the partition part 44 in a conventional liquid-filled mount. There was no longer anything that would trigger it. However, in the illustrated construction, an annular space 42 of a desired length is formed as an orifice of a predetermined length to be formed in the partitioning means. Cylindrical part 34.36
This is because the overlapping thickness of the flange portion 38.4.0 does not increase due to the formation of such an orifice.

Further, FIG. 7 shows an engine mount according to another embodiment of the present invention. In this case, the engine mount is arranged upside down compared to the previous example. Note that the same numbers are given to parts having the same functions as in the previous example, and explanations thereof will be omitted.

In short, in this embodiment, a rubber block 60 as a rubber elastic body has a thick cylindrical shape, and a machining allowance plate 4 having a mounting hole I-8 on one end thereof is fixed by integral vulcanization molding. On the other hand, an annular support fitting 14 is similarly fixed to the other end side of the rubber block 60, and by caulking and fixing this support fitting 14 to the protective fitting 26, two hat members, that is, an outer hat member, can be attached at the same time. The peripheral edge portion (flange portion) of the partition means formed by overlapping the inner frame I member 62 and the inner frame I member 64 and the peripheral edge portion of the diaphragm 22 are fixed in a liquid-tight manner. Then, these two hat members 62
．． 64, the rubber block 60
A working chamber 20 is formed therein, and a balance chamber 24 is formed between the partition means and the diaphragm 22, as in the previous example. In addition, the working chamber 20 and the equilibrium chamber 24
A predetermined incompressible fluid is sealed inside.

Furthermore, the two hat members 62 and 64 that are joined together to form the partition means have a slightly different shape from the previous example.
Each has a bottomed cylindrical portion having a substantially truncated cone shape. Then, an annular space 42 similar to the previous example is formed between the cylindrical wall portions close to the bottom (upper bottom) of the truncated cone-shaped bottomed cylindrical portions, in other words, between the shoulders, and although not shown,
The annular space 42 is communicated with the working chamber 20 and the balance chamber 24 through communication holes 46, 48 similar to those in the previous example. Furthermore, a movable rubber plate 56 is also housed in the cavity formed between the bottoms of the two hat members 62, 64, and is movable a predetermined distance to reduce the pressure of the incompressible fluid in the working chamber 20. It is made to act on the balance chamber 24 side.

In the above two embodiments, the space in which the movable plate 56 is accommodated is provided with a second bottom portion 50 at the bottom of the outer hat member 16, 62, and the second bottom portion 50 and the inner hat member 18. A predetermined gap is formed between the bottom of the inner hat part 1 and the bottom of the inner hat part 1.
8, 64 can be recessed inwardly to form a movable plate receiving cavity between the bottoms of the outer hat members 16, 62; There is no problem in providing a protruding second bottom portion and a recess that fits inside at the same time to serve as a movable plate accommodating cavity.

Further, it is preferable that the two hat members 16, 62; 18, 64 used together in the present invention are press-formed products formed by press working or punching, thereby reducing the manufacturing cost. The partitioning means, and by extension the mount, can be made inexpensive; however, the present invention is not limited to this, and there is no problem with the use of other suitable molding or manufacturing methods. be.

Furthermore, in the second column, an example in which the present invention is applied to an engine mount has been described, but the present invention can also be applied to other vibration-proof supports such as body mounts.

Furthermore, although not illustrated, various improvements, modifications, changes, etc. can be made to the present invention based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It goes without saying that this also includes such embodiments.

As is clear from the description in Section 2, the present invention provides a partition means located between an operating chamber and a balance chamber formed in a fluid-filled mount, which has a cylindrical portion with a bottom. It is constructed by overlapping two hat parts +1, and by overlapping them, a cavity in which the movable plate is housed is formed between the bottom parts, and an annular space forming an orifice is simultaneously formed between the cylinder walls. As a result, the structure of the partitioning means was significantly reduced in size, and the work to remove it was extremely easy, and the flange of such overlapping hat members Even when it comes to supporting the part, the thickness of that part is significantly thinner than that of conventional fluid-filled mounts.
Therefore, an effective compactification of the space taken up by such a partitioning means could be achieved.

In the present invention, such a hat member is formed by press processing! ! Since 111 pieces can be made, if the hat part side is made of such a pressed product,
Its production cost can also be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of an engine mount related to the vibration-proof support of the present invention, and Fig. 2 is a plan view of the overlapping outer side)\, throat member and inner hat member as a partition member. , FIG. 3 is an explanatory diagram of the communicating hole portion of the inner hat member in FIG. 2, FIGS. 4 and 5 are sectional views taken along the line ■-■ and V-V sectional view, respectively, in FIG. 2, and FIG. FIG. 7 is an exploded perspective view of such a partitioning means, and FIG. 7 is a sectional view showing another example of the engine mount 1 according to the present invention. 2.60: Rubber block 4: Mounting plate 14: Support metal fitting 16.62 = Outer hat part 18.64: Inner hat member 20: Working chamber 22: Diaphragm 24: Equilibrium chamber
26: Protective fitting 28: Seal part 34, 36: Bottomed cylindrical part 38.40
: Flange portion 42: Annular space 44: Blocking protrusion 4.6.4.8: Communication hole 50: Second bottom portion 52.54. : Action hole 56: Movable plate

Claims (5)

[Claims] (1) A rubber elastic body is provided on one side of the partition means to define an operating chamber within the rubber elastic body, and an enclosure at least partially made of a flexible thin film is provided on the other side of the partition means. to form an equilibrium chamber, and a predetermined incompressible fluid is sealed in the working chamber and the parallel chamber, while the working chamber and the equilibrium chamber are communicated through an orifice, and further supported by the partition means. In a vibration-proof support having a structure in which a movable plate can be moved a predetermined distance by pressure applied to a fluid in the working chamber, the partition means each has a hat shape consisting of a shallow-bottomed cylindrical part and a flange part. It is constructed by using an outer hat member and an inner hat member and overlapping them so that the latter bottomed cylindrical part is accommodated in the bottomed cylindrical part of the former, and the bottomed cylindrical part of the outer hat member A gap is provided between the cylindrical wall of the shaped portion and the cylindrical wall of the bottomed cylindrical portion of the inner hat member to form a circumferential annular space, and the annular space is communicated with the working chamber and the equilibrium chamber, respectively. The movable plate is housed between the bottom of the bottomed cylindrical portion of the outer hat member and the bottom of the bottomed cylindrical portion of the inner hat member, which are opposed to each other, thereby forming the orifice. A cavity is provided that can be moved a predetermined distance, and holes communicating with the working chamber and the equilibrium chamber are provided in the two bottom portions forming the cavity, so that the movable plate accommodated in the cavity can be moved. A vibration isolating support body characterized in that the pressure of the incompressible fluid in the working chamber is applied to the equilibrium chamber side. (2) Claim 1, wherein the outer hat member and the inner hat member are each press-molded products of metal plate materials.
Anti-vibration support as described in section. (3) Communication holes are provided in the outer hat member and the inner hat member, respectively, so that the annular space is partially blocked in the circumferential direction, and the annular space is communicated with the working chamber and the equilibrium chamber. Claim 1
Anti-vibration support as described in section. (4) The space in which the movable plate is housed is formed between a second bottom portion formed to protrude further outward at the bottom of the bottomed cylindrical portion of the outer hat member and a bottomed cylindrical portion of the inner hat member. The vibration-proof support according to any one of claims 1 to 3, which is formed between the vibration-proof support and the bottom. (5) Claims 1 to 4, wherein the outer hat member and the inner hat member constituting the partitioning means are attached and supported by a caulking fixing structure at their overlapping flange portions. The anti-vibration support described in any of paragraphs.