JPS59231239A - Mount filled with fluid - Google Patents

Abstract

PURPOSE:To more surely improve an isolating effect of high frequency vibration, by combining a mounting member connected to a vibrative source with a base member through an elastic member so as to form a fluid chamber in the inside and setting a weight to an effective area larger than the effective area of the elastic member. CONSTITUTION:An elastic member 30 made of rubber material and a diaphragm 40 are mounted by baking to a cylinder 11 of a base member 10, forming a fluid chamber 2 in the inside. The fluid chamber 2 supports in its inside a weight 50 of large area to be placed transversely floating by an elastic member 60, and an effective area SW of the weight 50 is set larger than the effective area SE of the elastic member 30. In this way, especially in the range of high frequency vibration, the force acting on the base member 10 via the part of an area SB in the peripheral edge of the elastic member 30 and the force by a spring component of the elastic member 30 are balanced, cancelling each other. Accordingly, an isolating effect of high frequency vibration is more surely improved by enabling the dynamic multiplying factor of a mount 1 to be decreased to almost zero in the range of high frequency vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a fluid mantle mount in which a weight is floatingly supported transversely within a fluid chamber. Regarding the mount.

As shown in FIG. 15, a mounting member 720 connected to a vibration source such as an engine, and a base member 7100 and cylindrical body 711 fixed to a fixed member such as a vehicle body frame are connected by an elastic member γ30 made of a rubber material. A small circular hole 716 is provided in the center of a partition plate 715 formed on the inner circumference of the cylindrical body 711, and a small-area circular weight 750 is inserted into the circular hole γ16 through an annular elastic member γ60 made of a rubber material. A diaphragm 740 is installed at the bottom of the cylindrical body 711.
A fluid mantle mount 701, such as an engine mount, is known.

An orifice 751 is formed in the center of the weight 750.

According to such mount γ01, the circular hole γ of the partition plate 715
Since the weight γ50, which is floatingly supported by the elastic member 760 in 16, resonates with the direction and phase of vibration reversed at the resonance point, the vibrations are canceled out, but in the high frequency vibration region exceeding the resonance point, the weight 750 becomes small. Due to the large area, the movement ability of the fluid in the upper and lower fluid chambers 703 and 704 is low, and the large area of the partition plate 715 integrated with the base member 710 causes micro vibrations to be transmitted to the base member 710. Therefore, it is impossible to bring the dynamic magnification to high frequency vibration close to zero, as shown by the broken line in FIG.

Therefore, the present applicant previously proposed in Japanese Patent Application No. 58-26076 a fluid-filled mount in which a large-area weight is floatingly supported across the fluid chamber. and the fluid pressure generated in the fluid chamber due to the minute vertical response of a large-area weight that follows changes in the relative position between the mounting member and the base member due to minute vibrations. By adjusting the balance, they cancel each other out and make the dynamic magnification extremely low.

In the present invention, such a large-area weight is placed in the fluid chamber at a cross-sectional area of 70.
In a fluid-filled mount supported by a ring, the purpose is to further ensure the high-frequency vibration isolation effect as shown in FIG. 9, that is, to make the dynamic magnification in the high-frequency vibration region approximately zero.

In order to achieve the above object, the present invention provides a fluid-filled mount by considering the effective area of a weight that is floatingly supported transversely in the fluid chamber as a dog, rather than the effective area of the elastic member that determines the movement ability of the fluid in the fluid chamber of the mount. The main point is that it has been constructed.

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

FIG. 1 is a central longitudinal cross-sectional view showing the basic configuration of a fluid-filled mount according to the present invention, in which a cylindrical body 11 of a base member 10 is formed with a mounting piece 18 on the outer periphery of the cylindrical body 11 for attaching to the fixed member side.
An umbrella-shaped elastic member 30 made of rubber material is provided on the upper part.
A lower layer of the diaphragm 40 is baked on the lower part of the cylindrical body 11, and a disk-shaped mounting member 20 for connecting a vibration source is baked on the upper center of the elastic member 30. It is being

Incidentally, the mounting piece 18 of the base member 10 is formed with mounting screw holes 19 for mounting to the fixed member, and although not shown, a mounting screw for mounting to the vibration source is provided protruding from the upper center of the mounting member 20. There is.

The outer periphery of an annular elastic member 60 made of a rubber material is baked onto the inner periphery of the intermediate portion of the cylindrical body 11 of the base member 10 constituting the peripheral wall of the fluid chamber 2 of the mount 1. , Large area 3- The outer periphery of the thick disc-shaped weight 50 is baked.

In this manner, the large-area weight 50 is floatingly supported across the fluid chamber 2 by the annular elastic member 60, so that the fluid chamber 2 is defined into an upper fluid chamber 3 and a lower diaphragm chamber 4.

In the illustrated example, the orifice 51 is formed in the center of the weight 50, but the orifice 51 does not necessarily need to be provided.

As described above, fluid (liquid in the drawing) is sealed in the fluid chamber 2 which is vertically defined by the weight 50.

Since the large-area weight 50 is floatingly supported across the fluid chamber 2 of the fluid-filled mount 1, in the high-frequency vibration region, the weight 50 is supported via the umbrella-shaped elastic member 30 that connects the base member 10 and the mounting member 20. Fluid is generated in the fluid chamber 2 due to the force acting from the mounting member 20 to the base member 10 and the minute vertical movement of the weight 50 that follows changes in the relative position between the mounting member 20 and the base member 10 due to minute vibrations. The pressure, that is, in this case, the force transmitted to the base member due to the fluid pressure in the upper fluid chamber 3 is approximately balanced and cancels each other out, so that the dynamic magnification can be made extremely low. The effect of blocking high frequency vibrations can be enhanced.

By the way, in order to further ensure the effect of blocking high-frequency vibrations, it is necessary to set the dynamic magnification of the semi-fluid-filled mount 1 to approximately zero in the high-frequency vibration region.

Therefore, the mounting member 20 also absorbs the force that is about to act on the base member 10 via the umbrella-like elastic member 30.
In this case, the weight 50, which moves up and down in response to changes in the relative position between the base member 10 and the base member 10, may be used to ensure that the fluid is absorbed by the fluid moving up and down in the upper fluid chamber 3.

Therefore, a specific analysis will be described below.

First, as shown in FIG. 2, the effective area of the umbrella-shaped elastic member 30 that contributes to the movement of fluid in the fluid chamber 2 of the mount 1 is SE, and the elastic member 3 that does not contribute to the movement of fluid
SB is the area of the peripheral edge of 0, and the inner periphery of the weight 50 and the annular elastic member 60 that supports it, which participates in the movement of fluid due to the vertical movement of the weight 50, which is floatingly supported across the fluid chamber 2. Let SW be the effective area of the 9th part.

Next, if the above mount 1 is modeled, it will be as shown in FIG. 3, that is, an umbrella-shaped elastic member 3 with a spring constant of k.
The spring constant of the effective area SE part which determines the movement ability of the fluid of 0 is ak, and the area SB part of the peripheral part which does not contribute to the movement of the fluid has a spring constant of k, and furthermore, the weight 50
The spring constant of the effective area Sw portion is dk. Here a,
Both d are arbitrary constants.

The principle of the present invention is that the fluid pressure P causes the base member 10 to
The force PsB acting on the cylindrical body 11 and the force due to the spring component (spring constant k) of the elastic member 30 are balanced and cancel each other out.

Therefore, the area of the peripheral edge of the umbrella-like elastic member 30 must at least exceed zero, that is, be positive (SB>O).

Here, since Sr, + SB = Sw, SB>
It can be seen that in order to satisfy O, SW>SE, that is, the effective area SW of the weight 50 must be smaller than the effective area SE of the umbrella-shaped elastic member 30.

However, since the elastic member 30 that connects the mounting member 20 and the base member 10 has a complex umbrella-like shape with shearing properties as shown in the figure, it is difficult to determine its effective area SE by simple calculation. Can not.

Therefore, an actual test was conducted to determine the effective area S of the elastic member 30.
Find E.

First, in preparation for the test, the umbrella-shaped elastic member 30 is turned upside down as shown in FIG.
is fixed by its lower flange 91. Here, the upper part of the tube body 90 is open to the atmosphere.

After injecting a liquid, such as water, into the tube 90 and letting it stand still, the mounting member 20 integrated at the lower center of the inverse umbrella-shaped elastic member 30 is forced to be displaced 11 mm from below as shown in FIG. Add displacement.

7- Due to this forced displacement, the level of the liquid rises inside the tube body 90, and this increased volume ■- is actually measured.

Therefore, the effective area of the elastic member 30 to be determined is obtained by 5E-Vl.

On the other hand, the same test as above was performed for the weight 50, and its effective area Sw was obtained, and as the analysis results described above, SW>S
Set to E.

According to the fluid-filled mount 1 of the present invention constructed in this way, the effective area Sw of the large weight 50 supported in the fluid chamber 2 in a 70-ring manner can be reduced by the mounting member 20 and the base member 10. Since the effective area SE of the combined elastic members 30 is larger than the effective area SE, especially in the high frequency vibration region, the force acting on the pace member 10 through the area 81 part of the peripheral edge of the elastic member 30 and the spring component of the elastic member 30 are The forces are balanced and cancel each other out.

Therefore, in other words, the force that attempts to act on the pace member 10 from the attachment member 20 via the elastic member 30 is
The weight 50, which moves up and down in response to changes in the relative position between the base member 10 and the upper flow 8, is reliably absorbed by the fluid moving up and down in the upper flow 8, so that the mount in the high frequency vibration region The dynamic magnification of 1 can be made approximately zero as shown by the solid line in FIG. 14, thereby making it possible to further reliably improve the high frequency vibration blocking effect.

Incidentally, in the above embodiment, the annular elastic member 60 that supports the weight 50 in a floating manner is directly baked onto the cylindrical body 11vc of the base member 10, but a sleeve may be interposed as shown in various modifications below. The desired effects can be achieved by changing the shape of the base member, etc., or even by changing the mount itself to an upright type or an inverted type, so examples of each modification will be listed below.

First, the mount 101 shown in FIG. 6 has a tapered part 112 that expands upward at the upper part of a cylindrical body 111, and a mounting piece 118 is formed on the outer periphery of the upper part of the tapered part 112. The lower outer periphery of an umbrella-shaped elastic member 130 with a hollow center portion is baked on the inner periphery of the base member 112 , and the truncated inverted conical mounting member 120 is baked on the upper inner periphery of this elastic member 130 . An annular clamping part 113 having a U-shaped cross section and opening inward is formed in the lower part of the cylindrical body 111, and the peripheral edge of the diaphragm 140 is inserted into the clamping part 113 and connected by caulking.

On the other hand, an umbrella-shaped elastic member 1 including the above-mentioned mounting member 120
An annular elastic member 1 baked on the outer periphery of a thick disk-shaped weight 150 having an effective area larger than the effective area of 30.
The inner periphery of the sleeve 171 is further baked on the outer periphery of the sleeve 60.

An orifice 151 is formed in the center of the weight 150.

The outer diameter of the sleeve 171 that supports the weight 150 inwardly via the annular elastic member 160 is the same as that of the base member 110.
The weight 15 is approximately the same diameter as the inner diameter of the cylindrical body 111 of the mount 101, and by fixing the sleeve 171 to the inner circumference of the cylindrical body 111 with adhesive or the like, the weight 15 is placed inside the fluid chamber 102 of the mount 101.
0 is floatingly supported across the board.

In the embodiments shown in FIGS. 1 and 6 above, the effective area of the weight is illustrated as a dog as much as possible, but the point is that SW>SE is sufficient, so the effective area of the weight is within the range that satisfies this condition. , the so-called effective piston area may be reduced.

FIG. 7 shows a structure in which the effective piston area of the weight is made as small as possible, in which an annular elastic member 260 having an inverted U-shaped cross section is attached to the outer periphery of an annular elastic member 260 formed by baking a weight 250 onto the inner periphery. The inner periphery of the stay 272 is baked, and such a stay 272
is fixed to the inner circumference of the cylindrical body 211 of the base member 210. The other configurations are the same as in FIG. 6.

Further, in this embodiment, the annular elastic member 26 supporting the weight 250
0 and the cylindrical body 211, an annular stay 272 having an inverted U-shape in cross section was interposed to ensure a predetermined distance. However, in the case of the basic type mount 1 shown in FIG. 8th
As shown in the figure, an annular support plate 14 is formed on the inner periphery of the cylindrical body 11, and the outer periphery of the annular elastic member 60 is baked onto the inner periphery of the support plate 14.

If the structure is configured as shown in FIGS. 7 and 8, the shape of the umbrella-like elastic member that connects the handle member and the base member is such that SE is small, that is, it is close to a compression type. In this case, it is possible to effectively deal with the case where Sw cannot be completely removed.

Furthermore, contrary to the above, in order to increase SW as much as possible while satisfying SW>SE and SE>O, as shown in FIG. A sleeve 371 is baked on the outer periphery of an annular elastic member 360 which has a diameter portion 316 and supports a weight 350 having a larger area than the above, and this sleeve 371 is attached to the cylindrical body 3
It is fixed to the large diameter portion 316 of No. 11. The other configurations are the same as in FIG. 6.

In the case of the basic type shown in FIG. 1, the lower inner periphery of the cylindrical body 11 is formed into a large diameter portion 16 as shown in FIG. Good.

In each of the above embodiments, a so-called upright type fluid mantle mount in which the mounting member and the base member are connected by an umbrella-like elastic member is shown, but as shown in FIGS. The present invention can also be applied to mold mounts.

First, the inverted mount 401 shown in FIG. 11 has a base member 410 formed by forming an upper wall 412 on the upper inner periphery of a hollow truncated cone 411 to close it, and forming a mounting piece 41γ on the lower outer periphery. The lower inner periphery of an inverted umbrella-shaped elastic member 430 with a hollow center is baked onto the outer periphery of the conical body 411, while the periphery of the large-diameter disc body 421 is tapered downward at the bottom. Cylindrical body 4 forming 426
The inverse umbrella-shaped elastic member is inserted into an annular clamping part 427 formed in the upper part of the holder 25 and has a U-shaped cross section, and is caulked to the inner periphery of the tapered part 426 of the mounting member 420. The upper outer periphery of the member 430 is baked.

Further, on the lower surface of the periphery of the disc body 421, there is an annular stay 4 having a hook-shaped cross section with the periphery of the diaphragm 440 baked onto the inner periphery.
41 are overlapped, and this annular stay 441 is also attached to the disc body 4.
21 is assembled into the cylindrical body 425 at the same time.

In this way, the mounting member 4 with the diaphragm 440 arranged above
A sleeve 4γ1 supports a weight 450 having an effective area larger than the effective area of the inverse umbrella-shaped elastic member 430 including the clay wall 412 of the base member 410 via an annular elastic member 460 on the inner periphery of the cylindrical body 425 on the 20 side. to fix.

Thus, a fluid (liquid in the illustration) is sealed in the upper diaphragm chamber 404 and lower fluid chamber 403 that are vertically defined by the weight 450.

An orifice 451 is formed in the center of the inner cone 450.

It will be easily understood that such an inverted type fluid-filled mount 401 can also exhibit the same effects as the upright type.

゛ Furthermore, the inverted type mount 501 shown in FIG.
0 has no orifice.

That is, an annular recess 514 is formed on the inner periphery of the lower end of the hollow cone 511 of the base member 510, the peripheral edge of the diaphragm 540 in an upwardly bulging state is inserted into this annular four part 514, and an annular support plate is formed on the lower surface of the mounting piece 517. 518 are overlapped and fixed, thereby assembling the diaphragm 540.

and the upper wall 51 of the hollow cone 511 of the base member 510
An orifice 513 is formed in the center of 2, and fluid is sealed in an upper fluid chamber 503 and a lower diaphragm chamber 504 that are vertically defined by the upper wall 512. The other configurations are the same as in FIG. 11.

Furthermore, the inverted mount 601 shown in FIG. 13 is a combination of the structures shown in FIGS. When forming the upper wall 61, the weight 650 and the orifice 613 of the base member 610 are formed.
An intermediate fluid chamber 603 is formed between the upper wall 612 and a diaphragm 640 disposed below the upper wall 612 to form a lower diaphragm chamber 604.

An orifice 651 is provided in the inner cone 650.

In all of the embodiments listed above, a diaphragm is attached, but there is also a fluid-filled mount that is configured vertically symmetrically with the weight as a boundary without providing a diaphragm, and of course the same effect and effect can be obtained with this. is obtained.

115 = As is clear from the above description, according to the present invention, the effective area of the weight supported floating transversely within the fluid chamber is set as larger than the effective area of the elastic member that connects the mounting member and the base member. Since the fluid-filled mount is configured, the dynamic magnification in the high frequency vibration region can be reduced to almost zero.
Therefore, the effect of blocking high frequency vibrations can be further ensured.

[Brief explanation of the drawing]

Figures 1 to 14 show embodiments of the present invention, with Figure 1 being a central vertical sectional view showing the basic configuration of the fluid-filled mount according to the present invention, and Figure 2 showing the effective area of each mound. FIG. 3 is a model diagram, FIG. 4 is a vertical sectional view of the test device, FIG. 5 is a diagram of its operation, and FIGS. 6 and 7 show the second and third embodiments, respectively. FIG. 8 is a sectional view of the main part showing a case where the modified part of the third embodiment is applied to the one shown in FIG. 1; FIG. 9 is a center longitudinal sectional view showing the fourth embodiment;
Fig. 10 is a sectional view of the main part showing the case where the modified part of the fourth embodiment is applied to the one shown in Fig. 1, Fig. 11 and 16-dynamic magnification characteristic curve, and Fig. 15 is a diagram of the conventional fluid mange mount. FIG. In the drawings, 1 is a fluid mantle mount, 2 is a fluid chamber, 10 is a base member, 20 is a mounting member, 30 is an elastic member that connects the base member and the mounting member, SE is its effective area, 50 is a weight, Sw is its effective area, and 60 is an elastic member that supports the weight. Patent Applicant Honda Motor Co., Ltd. Agent Patent Attorney 2 1) Part 1 Patent Attorney Kuni Ohashi Intention Patent Attorney 2
Mountain law me 239- Lo 0,

Claims (1)

[Claims] A fluid chamber in which a mounting member connected to a vibration source and a base member for mounting the vibration source are coupled with an elastic member to form a fluid chamber therein, and a weight is floatingly supported across the fluid chamber. A fluid-filled mount, characterized in that the effective area of the weight is larger than the effective area of the elastic member.