JPS6091037A - Fluid containing mount - Google Patents

Abstract

PURPOSE:To sharply reduce the transmission of vibration by floatingly supporting a weight, laterally crossingly faced to a fluid chamber, and making the kinetic magnification in a high-frequency vibration area nearly zero. CONSTITUTION:A base member 2 and a mounting member 3, which is connected to a vibrating source, are linked by means of a thick-walled, umbrella-shaped elastic member 4, forming a fluid chamber 11 inside them. A weight 7 having an inverse truncated cone part 71 is fitted to the mounting member 3 through an elastic member 8. This weight 7 has a larger effective area than that of the elastic member 4. And, when the mounting member 3 is moved downward, the weight 7 acts so as to draw up a fluid, causing fluid pressure in the fluid chamber 11 to be low, to generate force to draw the elastic member 4 toward the fluid chamber 11 side. Also, due to the downward displacement of the mounting member 3, a downward force toward the base member 2 is generated. Since each of these forces mutually offsets against the other, the kinetic magnification in a high-frequency vibration area becomes nearly zero.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid-filled mount which has a novel structure and which significantly improves the vibration isolation effect in the high frequency range above the secondary vibration range.

The present applicant previously disclosed in Japanese Patent Application No. 105509/1983 that a mounting member connected to a vibration source and a base assembly for mounting the vibration source were connected by an elastic member, and a fluid chamber was formed inside the mounting member. A fluid mount is proposed in which a weight having an effective area larger than the effective area of the elastic member is supported in a transverse manner by 70 rings. According to this, the force that attempts to act on the base member from the mounting member via the elastic member is reliably applied to the fluid moving in the fluid chamber by the weight that moves up and down in response to changes in the relative position between the mounting member and the base member. Since it is absorbed, the dynamic magnification in the high frequency vibration region can be reduced to approximately zero, and therefore the high frequency vibration blocking effect can be greatly improved.

The present invention has been accomplished with the object of providing a fluid-filled mount with a novel structure that has the above advantages while increasing the degree of freedom in design.

In order to achieve the above object, the present invention provides a fluid-filled mount in which the mounting member and the base member are joined together at the inner and outer peripheries of an elastic member to form a fluid chamber therein. A communicating chamber with a relatively large area is formed by bulging toward the mounting member or the base member, and a weight having an effective area larger than the effective area of the elastic member that determines the movement ability of the fluid in the mount is installed in the chamber. The gist is that floating support was applied across the board.

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

FIG. 1 is a central vertical cross-sectional view of the mount of the first embodiment, in which the base member 2 has a flange piece 21 at the upper end of a tapered hollow body 20 that expands upward, and a cross-sectional core that opens inward at the lower end. The third part is provided with a letter-shaped clamping part 23, and a mounting part.
A hollow body 30 has a large-diameter cylindrical portion 33 formed at the top of a funnel portion 31 having a diameter sufficiently smaller than that of the hollow body 20 through a tapered portion 32, and a peripheral edge is formed in a clamping portion 34 provided at the upper end of the cylindrical portion 33. It consists of a disc body 35 which is inserted and crimped.

The flange piece 21 of the base member 2 has mounting holes 22 for connecting to a fixed member such as a vehicle body frame, and the center of the disc body 35 of the mounting part 3 has a mounting screw for connecting to a vibration source such as an engine. 36 have been erected.

Then, the outer periphery of an umbrella-shaped elastic member 4 made of a rubber material is baked onto the inner periphery of the hollow body 20 of the base member 2.
The entire inner circumference of this elastic member 4 is baked onto the outer circumference of the funnel portion 31 of the attachment member 3. In addition, inside the holding part 23 of the base member 2, there is a periphery of an orifice plate 5 having an orifice 51 in the center, and a laminated plate 61 on which the periphery of an abutting diaphragm 6 is baked on the lower surface of the orifice plate 5.
is inserted, and the clamping portion 23 is tightened to hold the orifice plate 5 and the diaphragm 6.

Furthermore, a sleeve 9 is fitted onto the inner periphery of the cylindrical portion 33 of the mounting member 3,
The outer periphery of an annular elastic body 8 made of a rubber material is baked on the inner periphery of this sleeve 9, and the large-area, thick disk-shaped weight 7 is baked on the inner periphery of this elastic body 8. A truncated inverted conical part 11 having a smaller diameter than the funnel part 31 is integrally formed to hang down from the lower surface of the weight 7, and this inverted conical part 71Fi faces the inside of the funnel part 31.

In this way, a main fluid chamber 11 is formed above the orifice plate 5, and a sub-fluid chamber 12 is formed below, and the fluid-filled mount 1 is constructed by completely filling and sealing the compartments 11 and 12 with liquid.

Next, the operation will be explained based on FIG. 2, which shows the mount 1 cut in half, and FIG. 3, which shows the elastic member 4.

In the high frequency region above the secondary vibration region, the weight 7 is almost stationary due to inertia, so when the mounting member 3 supporting the weight 7 moves downward, the weight T acts to suck the fluid.
The fluid pressure in the main fluid chamber 11 becomes low, and as a result, the elastic member 4 is attracted toward the main fluid chamber 11 (see FIG. 2). For this reason, a force F1 is generated in the elastic member 4 that pushes the base member 2 upward as shown in FIG.

On the other hand, the downward displacement of the mounting member 3 generates a downward force F2 to the base member 2 through the elastic member 4.

Therefore, in the present invention, each parameter described later is set to an appropriate value so that Fl and F2 cancel each other out, and the dynamic magnification (l k'l
/ks) to almost zero, resulting in a significant reduction in vibration transmission.

The specific analysis is described below.

First, as shown in FIG. 2, the main fluid chamber 11 of the mount 1 is
The effective area t-8B of the elastic member 4 that participates in the movement of fluid within
The area of the peripheral edge of the elastic member 4 that does not contribute to the movement of fluid is ISn, and the funnel portion 31 of the mounting member 3 is
Let the passage area at the lower end = 2SH.

Therefore, the effective area of the elastic member 4 is (SE + SH)
It is. and the effective area IS of the orifice plate 5.

Furthermore, it is assumed that the effective area of the inner peripheral portion of the weight T and the elastic body 8 that supports it is 2Sw. Here So −3E +S
It is H-4-SB.

Next, if the above mount 1 is modeled, it will be as shown in FIG. 4, that is, the spring constant of the effective area SE part that determines the fluid movement ability of the elastic member 4 whose spring constant is k is ak, and The spring constant of the effective area Sw portion of the weight 7 is dk. Here, both a and d are arbitrary constants. Therefore, if the displacement amount of the vibration source is X, the displacement amount of the SE part is represented by Xg, and the displacement amount of the Sw part is represented by The force transmitted to member 2 is F
shall be.

In the above, in a high frequency vibration region such as secondary vibration, since xw is O, it can be expressed as F = kx + PSo - PSs = kx 10P (Sr+So) (i).

On the other hand, since there is XWWO2, x, =8-Q.

Therefore, by substituting (+++ expression'k) into expression (i), we obtain.

Therefore, by selecting 5W-(1→-a)(Sl+Sl+), it can be seen from the formula that F=0.

Therefore, SW>(SE+511) becomes a condition that satisfies the above condition, that is, the effective area of the weight 7 may be configured to be larger than the substantial effective area of the elastic member 4.

By the way, since the elastic member 4 that connects the mounting member 2 and the base member 3 has a complex umbrella-shaped shape with shearing properties, its effective area Sg=2 cannot be determined by simple calculation. , and since the elastic body 8 supporting the weight 7 is also annular in shape with shearing properties, its effective surface fjiSW'(i- cannot be easily determined).

Therefore, we actually conducted a test and calculated each effective area 548w. First, we will describe how to calculate the effective area SE of the elastic member 4.

First, as shown in FIG. 5, the lower end of the hollow body 130 with the funnel part 131 facing upward is closed with a lid plate 139, and the inner periphery of the elastic member 4 is fixed to the outer periphery of the funnel part 131, thus forming an inverted umbrella shape. A tube body 100 is fixed to the upper part of the elastic member 4 with its flange portion 101.

After injecting liquid into the pipe body 100 and letting it stand still,
A forced displacement of two displacement amounts is applied to the hollow body 130 from below as shown in FIG. As a result, the liquid level is reduced to 10
0 and the volume movement amount V mtA is actually measured.

■ Therefore, SE-1-3H is obtained.

Next, how to determine the effective area SW of the weight 7 will be described.

First, as shown in FIG. 7, the outer periphery of the elastic body 8 supporting the weight 7t is fixed to the inner periphery of a cylindrical portion 107 that is continuous with the tubular body 105 via a flange portion 106.

After injecting liquid into the pipe body 105 and keeping it stationary,
Displacement amount from below to weight 7 as shown in Figure 8! Gives forced displacement of the fin. Then, the volume movement is set so that Sw>(SE+SH) of the above-mentioned analysis results.

Thus, according to the fluid-filled mount 1 of the present invention, in the high-frequency vibration region exceeding secondary vibration, the force Fl that tries to push the base part 2 upward due to the suction action of the weight 7 and the elastic part 4 The force F2 acting on the base member 2 via
and cancel each other out, so that the force Fi is finally transmitted to the base member 2 through the entire orifice plate 5.
It can be set to approximately zero. That is, the dynamic magnification (l k” l
/ks)1 As shown by the solid line in FIG. 13, it can be reduced to approximately zero, thereby greatly improving the vibration isolation effect in the high frequency region.

Next, a second embodiment will be described based on FIG. 9.

In this embodiment, the cover plate 229 is inserted into the clamping portion 223 of the base member 202 connected by the elastic member 204 in the same manner as described above, and is closed by crimping. And the cylindrical part 2 of the mounting member 203
A laminated plate 261 holding the diaphragm 206 is inserted into the clamping part 234 at the upper end of the disc body 235 in contact with the lower surface of the periphery of the disc body 235, and the clamping part 234 is crimped. Furthermore, a communication hole 272 is provided vertically in the center of the weight 207 disposed in the cylindrical portion 233 via the sleeve 209 and the elastic body 208 to the bottom of the truncated inverted conical portion 271, and an orifice 27 is provided in the bottom wall of the communication hole 272.
Open 3.

In this way, a main fluid chamber 211 is formed below the weight 207, which also serves as an orifice plate, and a sub-fluid chamber 212 is formed above it.

The effects of the mount 201 of the second embodiment are also substantially the same as those described above.

In the above embodiments, an upright type fluid-filled mount has been described, but an inverted type fluid-filled mount will be described below.

FIG. 10 shows the entire inverted mount according to the third embodiment,
The base member 302 consists of a cylindrical body 320 having a flange piece 321 at the upper end and a clamping part 323 at the lower end, and an inverted funnel body 325 having a flange piece 326 joined to the flange piece 321. The attachment part'@303 includes a tapered hollow body 330 that is sufficiently larger in diameter than the reverse funnel body 325 and expands downward, and a clamping part 3 provided at the upper end of this hollow body 330.
34 and a disc body 335 inserted and crimped.

And the reverse funnel body 325 of the base member 302 and the mounting member 3
03 hollow body 330 and an inverted umbrella-shaped elastic member 30.
4, the diaphragm 306 is inserted into the clamping part 323 of the cylindrical body 320 of the base member 302, and the diaphragm 306 is crimped, and the weight 307 is further disposed inside the cylindrical body 320 via the sleeve 309 and the annular elastic body 308. do. A truncated conical portion 371 having a diameter smaller than that of the inverted funnel 325 is provided on the upper surface of the weight 307, and a communication hole 372 is provided vertically in the center of the weight 307 up to the upper portion of the truncated conical portion 371 for communication. An orifice 373 is opened in the earthen wall of the hole 372.

In this way, a main fluid chamber 311 is formed above the weight 307, which also serves as an orifice plate, and a sub-fluid chamber 312 is formed below.

If such an inverted mound) 301t model is created, the first
As shown in Fig. 1, the vibration transmission path is reversed from Fig. 4 which shows the upright type.

If we perform an analysis based on the model diagram in Fig. 11, in the high frequency vibration region, x, , rFO, so dk
The force that is transmitted becomes almost zero. If the fluid is incompressible, it can be expressed as 5w5E= (SE+5HXxE-x).

On the other hand, the total transmitted force is F = kx + ahcB +++ (V).

Therefore, by substituting equation (6V) into equation (9), we obtain.

Since this fVt formula is the same as the above-mentioned formula, it can be seen that even an inverted type can exhibit the same effect as an upright type.

Next, a fourth embodiment will be described based on FIG. 12.

The base layer 402 of this embodiment has a lower part 1 of a cylindrical part 423 that is continuous with the lower part of the inverted funnel part 421 via a tapered part 422.
It consists of a hollow body 420 equipped with a flange piece 424 and a cover plate 429 joined to the flange piece 424, and the mounting member 403 is made of a tapered hollow body 4 similar to the third embodiment.
30, and a cap body 435 which is inserted into the clamping portion 434 of the cap body 435 and crimped. Similarly, the reverse funnel part 421
and the hollow body 430 are coupled by the elastic member 404, and on the other hand, a laminated plate 461 holding the diaphragm 406 is inserted into the clamping portion 434 of the hollow body 430 so as to be in contact with the lower surface of the peripheral edge of the cap body 435, and the laminated plate An orifice plate 405 having an orifice 451 in the center is inserted into the lower surface of the periphery of 461, and this clamping portion 434 is crimped. Further, a weight 407 is disposed within the cylindrical portion 423 via a sleeve 409 and an elastic body 408. This weight 407 is not provided with a communication hole or an orifice.

In this way, the orifice plate 40 disposed above the weight 407
The main fluid chamber 411 is located below the main fluid chamber 411, and the auxiliary fluid chamber 41 is located above the main fluid chamber 411.
2 are formed respectively.

The inverted mount 401 of the fourth embodiment can also provide substantially the same effects as those described above.

As is clear from the above description, according to the present invention, a bulge is formed from the inner peripheral side of the elastic member that connects the mounting member and the base member toward the heavy metal mounting member or the base member that partially constitutes the fluid chamber, In this chamber, a weight having an effective area larger than the effective area of the elastic ablation was supported cross-sectionally with 70 rings to form the fluid man-mount, so that the vibration cutting effect in the high frequency range above the secondary imaging area was completely eliminated. This can be greatly improved, and since such advantages can be provided with a new structure, an increase in the degree of freedom for each stage can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a central vertical cross-sectional view showing a first embodiment of the fluid-filled mount according to the present invention, FIG. 2 is a half-cut view showing its operation, FIG. 3 is a cross-sectional view of the elastic member portion, and FIG. Model diagram, Figure 5 is a vertical sectional view of the test device, Figure 6 is its working diagram, Figure 7 is a vertical sectional view of another test equipment, Figure 8 is its working diagram, and Figure 9 is the second implementation. The central vertical cross-sectional view of the example, Figure 10 is the 3rd
Similar diagrams of the embodiment, FIG. 11 is a model diagram thereof, FIG. 12 is a longitudinal cross-sectional view of the fourth embodiment under medium heat, and FIG. 13 is a frequency [Hz]-dynamic magnification (lk” l/ks)M
It is a line diagram. In the drawings, 1 is a fluid-filled mount, 2 is a base member, 3 is a mounting member, 4 is an elastic member, I is a weight, 8 is an elastic body, 11.
12 is a fluid chamber. Figure 1 Figure 2 Figure 4;

Claims (1)

[Claims] In a fluid-filled mount in which a mounting member connected to a vibration source and a base assembly for mounting the vibration source are connected at the inner and outer peripheries of an elastic member to form a fluid chamber inside, from the inner periphery side of the elastic part. A chamber communicating with the fluid chamber is formed by bulging toward the above-mentioned member or base member. Features 9 fluid filled mounts.