JPS59231238A - Mount filled with fluid - Google Patents

Abstract

PURPOSE:To improve an isolating effect from high frequency vibration, by forming a weight so as to vertically rock while holding the horizontality, in the case of a mount filled with fluid which supports the weight of large area to be placed transversely floating in a fluid chamber. CONSTITUTION:A weight 50 suspends a cylindrical part 56, concentrically formed with and having a contour smaller than a piston structure, to be provided on a bottom surface of the piston structure 51 of disc shape in large thickness having an effective area sufficiently larger than the effective area of an elastic member 30 containing a mounting member 20. An annular elastic member 60 is mounted by baking between the cylindrical part 56 and a sleeve 74. While a diaphragm 40 is integrally formed with the annular elastic member 60 in its bottom part. A piston ring 71 and guide bushes 72, 73, consisting of low friction material, are fitted to the periphery of the piston structure 51, while a cylinder sleeve 75 similarly consisting of low friction material is secured in a cylinder 11 forming the peripheral wall of a fluid chamber 2. Then the weight 50 is vertically slidably fitted into the cylinder 11 through these low friction materials.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a fluid-filled mount in which a weight is supported transversely in a fluid chamber by 70 rings, and in particular, to further ensure the high-frequency vibration isolation effect. When the area of the weight is made as large as possible, the weight is kept horizontal like a piston in the fluid chamber and smoothly swings up and down, and the sliding resistance of the weight is minimized to achieve the desired vibration isolation effect. Regarding the fluidity of people who want to achieve this.

As shown in FIG. 9, a mounting member 220 connected to a vibration source such as an engine, and a base member 2100 and cylindrical body 211 fixed to a fixed member such as a vehicle body frame are connected by an elastic member 230 made of a rubber material. A small circular hole 216 is provided in the center of a partition plate 215 formed on the inner periphery of the cylindrical body 211, and a disk-shaped weight 250 with a small area is inserted into the circular hole 216 through an annular elastic member 260 made of a rubber material. Fluid mount 2, such as an engine mount, is made by attaching a diaphragm 240 to the lower part of the cylindrical body 211.
01 is known.

An orifice 255 is formed in the center of the weight 250.

According to such a mount 201, the circular hole 2 of the partition plate 215
Since the weight 250 floatingly supported by the elastic member 260 at 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 250 becomes small. Due to the large surface area, the movement ability of the fluid in the upper and lower fluid chambers 203 and 204 is low, and the large area of the partition plate 215 integrated with the base member 210 causes micro vibrations to be transmitted to the base member 210. ,
Therefore, it has been 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-mounted system in which a large-area weight is floatingly supported across the fluid chamber, and an elastic member is connected to the mounting member in the high-frequency vibration region. and the fluid pressure generated in the multi-fluid chamber due to the small vertical response of the large-area weight that follows changes in the relative position between the mounting member and the base member due to minute vibrations. were roughly balanced, canceling each other out, and making the dynamic magnification extremely low.

The present invention aims to further ensure the high-frequency vibration isolation effect in a fluid-filled mount in which such a large-area weight is floatingly supported transversely within a fluid chamber, that is, the dynamic magnification in the high-frequency vibration region is approximately When the area of the weight is made as large as possible in order to achieve zero vibration, the weight is constructed so that it can swing up and down while keeping it horizontal, and the sliding resistance of the weight is made as small as possible to achieve the desired vibration isolation effect. The purpose of this invention is to provide a fluid system that can be effectively achieved.

In order to achieve the above object, the present invention makes the area of the weight that is floatingly supported transversely in the fluid chamber larger than the effective area of the elastic member that determines the movement ability of the fluid in the fluid chamber of the mount. It consists of a piston body with a surface area, and a low-friction ring is fitted to the piston body, while a low-friction sleeve is fixed inside the cylindrical body constituting the peripheral wall of the fluid chamber, and both of the low-friction rings and sleeves are connected to each other. The gist is that a piston body, which is a weight, is slidably fitted into a cylindrical body.

Preferred embodiments of the present invention will be described below together with its basic principles. The details will be explained based on the attached drawings.

First, to explain the basic principle of the present invention, FIG. 3 is a central longitudinal cross-sectional view showing the basic configuration of a mount in which a weight is floatingly supported transversely within a fluid chamber. A lower layer of an umbrella-shaped elastic member 130 made of a rubber material is baked onto the upper part of the cylindrical body 111 of the base member 1100, which forms the mounting piece 118 of the base member 1100.
Further, the periphery of a diaphragm 140 is baked into the lower part of the cylindrical body 130, and furthermore, a disk-shaped mounting member 120 for connecting a vibration source is baked into the upper center of the elastic member 130.

The outer periphery of an annular elastic member 160 made of a rubber material is baked onto the inner periphery of the intermediate portion of the cylindrical body 111 of the base member 110 that constitutes the peripheral wall of the fluid chamber 102 of the mount 101, and the inner periphery of this annular elastic member 160 is further baked. , the outer periphery of a thick disc-shaped weight 150 that is applied over a large area is baked.

Since the annular elastic member 160 supports the large-area weight 150 in the fluid chamber 102 in a 70-ring manner, the fluid chamber 102 is divided into an upper fluid chamber 103 and a lower diaphragm chamber 104. Ru.

In the illustration, an orifice 155 is formed in the center of the weight 150.

As described above, the fluid chamber 10 is defined vertically by the weight 150.
A fluid (liquid in the illustration) is sealed within 2.

Since the large-area weight 150 is floatingly supported across the fluid chamber 102 of the fluid-filled mount 101, in the high-frequency vibration region, the weight 150 is supported via the umbrella-like elastic member 130 that connects the base member 110 and the mounting member 120. The force acting on the base member 110 from the mounting member 120 and the vibration caused by the mounting member 120 and the base member 11
The fluid pressure generated in the fluid chamber 102 due to the minute vertical movement of the weight 150 that follows the change in relative position with respect to 0, that is, the fluid pressure in the upper fluid chamber 103 in this case, is transmitted to the base member. The forces are approximately balanced and cancel each other out, so the dynamic magnification can be made extremely low and the effect of blocking high-frequency vibrations can be increased. In order to achieve this, it is necessary to set the dynamic magnification of the fluid-filled υ mount 101 to approximately zero in the high-frequency vibration region.

Therefore, from the mounting member 120 to the umbrella-like elastic member 130
In this case, the force acting on the base member 110 via the weight 150, which moves up and down following the relative position change between the mounting member 120 and the base member 110, is applied to the upper fluid chamber 1.
It is only necessary to ensure that the fluid is absorbed by the fluid moving up and down within 03.

Therefore, a specific analysis will be described below.

First, as shown in FIG. 4, the fluid chamber 1 of the mount 101 is
Umbrella-like elastic member 13 that participates in the movement of fluid within 02
The effective area of 0 is SE, and the area of the peripheral edge of the elastic member 130, which contributes a lot to the movement of fluid, is SR. Let Sw be the effective area of the inner peripheral portion of the weight 150 and the annular elastic member 160 that supports it, which participates in the movement of the weight 150.

Next, if the above mount 101 is modeled, it will be as shown in FIG. Also, the area SB of the peripheral portion that does not contribute to the movement of the fluid naturally has a spring constant of 1 (1), and the effective area 8w of the weight 150 has a spring constant of d'. are both arbitrary constants.

The basic principle of the present invention is that the fluid pressure P acts on the cylindrical body 111 of the base member 110 through the area SB of the peripheral edge of the umbrella-like elastic member 130, and the spring component of the elastic member 130 (spring constant k) are balanced and cancel each other out.

Therefore, the area of the peripheral edge of the umbrella-like elastic member 130 must at least exceed zero, that is, be positive (SR>O)''n.

S here. Since +SB=Sw, in order to make SB>0, SW> SE z, that is, the effective area Sw of the weight 150
is the effective area SIi of the umbrella-like elastic member 130.

I understand that I have to be big and strong.

However, since the elastic member 130 that connects the mounting member 120 and the base member 110 has a complex umbrella-like shape with shearing properties as shown in the figure, its effective area S0 can be determined by simple calculation. It is not possible.

Therefore, an actual test is performed to determine the effective area SF of the elastic member 130.

First, in preparation for the test, the umbrella-shaped elastic member 130 is
is turned upside down as shown in FIG. 6, and its periphery is fixed, and the tube body 190 is fixed by its lower flange 191 to the upper part of the elastic member 130 forming an inverted umbrella shape. Here, the upper part of the tube body 190 is open to the atmosphere.

After injecting a liquid, for example water, into the pipe body 190 and letting it stand still, the mounting member 120 integrated at the lower center of the inverse umbrella-shaped elastic member 130 is fitted with a displacement path from below as shown in FIG. Add forced displacement. Due to this forced displacement, the level of the liquid rises inside the tube 190, and this increased volume Vmrr? Measure.

Therefore, the desired effective area of the elastic member 130 is obtained by 50-V/no.

8- On the other hand, the same test as above was performed for the weight 150, and its effective area Sw was obtained, and the energization Sw>S of the analysis results described above.
Set to o.

According to the fluid-containing mount 101 configured in this manner and showing the basic principle of the present invention, the large effective area Sw of the weight 150 that is floatingly supported across the fluid chamber 102 is attached to the mounting member 120 and the base member 110. The effective area SF of the elastic member 130 that combines the

Since the width is also large, especially in the high frequency vibration region, the base member 11 passes through the area SB of the peripheral edge of the elastic member 130.
The force acting on the elastic member 130 and the force due to the spring component of the elastic member 130 are approximately equal to each other and cancel each other out.

Therefore, in other words, from the mounting member 120 to the elastic member 130
The force that attempts to act on the base member 110 through the above is reliably absorbed by the fluid moving up and down in the upper fluid chamber 103 by the weight 150, which moves up and down in response to changes in the relative position between the mounting member 120 and the base member 110. Therefore, the dynamic magnification of the mount 101 in the high frequency vibration region can be set to approximately zero as shown by the solid line in FIG.
Therefore, the effect of blocking high frequency vibrations can be improved even more reliably.

By the way, if the area of the weight 150 is made as large as possible while satisfying the above conditions SW>80 and SB>0, the wall thickness in the radial direction of the annular elastic member 160 that supports the weight in a floating manner becomes thinner, so in practice, There is a possibility that the floating action will not be performed smoothly.

Therefore, in the present invention, the weight is floatingly supported by an annular elastic member below or above, and the weight can be slid up and down smoothly with low frictional resistance like a piston inside the cylindrical body that constitutes the peripheral wall of the fluid chamber. .

First, a first embodiment of a fluid-filled mount 1 according to the present invention will be described with reference to FIG. The lower outer periphery of an umbrella-shaped elastic member 30 having a hollow center portion is baked onto the inner periphery of the tapered portion 12 of the base member 10 forming the mounting piece 18, and a truncated inverted cone is formed on the upper inner periphery of the elastic member 30. The shaped mounting member 20 is baked.

Note that the lower inner periphery of the tapered portion 12 of the base member 10 is the cylindrical body 1.
The mounting piece 18 is formed with an annular protrusion 13 having a diameter smaller than the inner diameter of the mounting member 20, and the mounting piece 18 is formed with mounting screw holes 19 for mounting to the fixed member. 21 is provided protrudingly.

On the other hand, the weight 50 has an effective area S that is sufficiently larger than the effective area S0 of the umbrella-shaped elastic member 30 including the mounting member 20.
A cylindrical portion 56 having a small diameter and concentric with the lower surface of a thick-walled disk-shaped piston body 51 having a diameter w is provided vertically,
The outer periphery of the piston body 51 is provided with three annular fitting grooves 52 at the top, middle and bottom.
, 53 and 54 are formed, and a piston ring 71 is fitted into the intermediate fitting groove 53, and guide bushings 72, 73 are fitted into the upper and lower fitting grooves 52, 54, respectively.

The inner periphery of an annular elastic member 60 having a sufficient radial wall thickness is baked on the outer periphery of the cylindrical portion 56 of the weight 50, and the outer periphery of the annular elastic member 60 is slightly larger in diameter than the diameter of the piston body 51. The inner periphery of the sleeve 74 is baked.

11- And in this embodiment, on the lower inner periphery of the annular elastic member 60,
A diaphragm 40 is formed integrally with this. In the free state, the diaphragm 40 bulges upward into the cylindrical portion 56.

In this manner, the cylinder sleeve γ5 is first inserted from below into the cylindrical body 11 of the base member 10, and then the sleeve 74 supporting the weight 50 via the annular elastic member 60 is inserted, so that the upper end of the cylinder sleeve 75 is annular. While abutting against the protrusion 13, the lower end of the cylindrical body 11 is crimped inward, and the upper and lower sleeves 75.degree.

In the above, the piston ring 71 fitted to the piston body 51 of the weight 50, both guide bushes 72 and 73, and the cylinder sleeve 75 assembled to the inner circumference of the cylindrical body 11 are all made of a low-friction material, that is, in the embodiment, a Teflon material. The piston ring 71 is in close contact with the inner periphery of the cylinder sleeve 75, but a small gap is formed between the guide bushes 72 and 73 as shown in the figure.

Although an orifice 55 is formed in the center of the piston body 51, the orifice 55 does not necessarily need to be provided.

As described above, fluid (liquid in the drawing) is sealed in the fluid chamber 2 defined vertically by the piston body 51 of the weight 50.

The weight 50 is constituted by a large-area piston body 51, and a piston ring 71 and guide bushes 72 and 73 made of a low-friction material are fitted around the piston body 51, while forming the peripheral wall of the fluid chamber 20. A cylinder sleeve 75 also made of a low-friction material is fixed inside the cylindrical body 11, and these low-friction rings 71, 72, 73 and the sleeve 7
Since the weight 50 is fitted into the cylindrical body 11 via the piston body 51 so as to be slidable up and down, even if the area of the weight 50 is made as large as possible in order to make the dynamic magnification approximately zero in the high-frequency vibration region, the weight 50 does not fit into the piston body 51. It is possible to vertically swing smoothly while maintaining the horizontal position and with the sliding resistance as small as possible, thus effectively achieving the desired vibration isolation effect. Moreover, since the weight 50 is supported below by the annular elastic member 60, the elastic member 60 can have a large wall thickness in the radial direction, so that its floating action is sufficiently smooth.

By the way, in the first embodiment described above, the diaphragm 40 is integrated with the lower inner periphery of the annular elastic member 60, but instead of this, as shown in FIG. A sleeve 78 separate from the member 60 is baked on the periphery of the diaphragm 80, and the diaphragm 80 is further placed under the sleeve 74 that supports the weight 50 inserted into the cylindrical body 11. A supporting sleeve 78 may be inserted and the lower end of the cylindrical body 11 may be crimped inward in the same manner as described above. The other configurations are the same as in FIG. 1.

In the embodiment with a tilted surface, the present invention was applied to a so-called royal type fluid-filled mount in which the cylindrical body was integrated on the base member side, but the present invention was applied to an inverted type fluid-filled mount in which the cylindrical body was integrated on the mounting member side. Of course, the present invention is also applicable. It is also possible to dispose an annular elastic member above the piston body, which supports the weight by 70 degrees. Furthermore, the present invention can also be applied to a fluid mount that does not include a diaphragm and is configured to be substantially vertically symmetrical with respect to the weight.

As is clear from the above description, according to the present invention, the effective area of the elastic member that connects the mounting member and the base member is equal to the area of the weight floatingly supported across the fluid chamber. It is composed of a large-area piston body, and a low-friction ring is fitted to the piston body layer, while a low-friction sleeve is fixed inside the cylindrical body that constitutes the peripheral wall of the fluid chamber, which further improves the effect of blocking high-frequency vibrations. In order to ensure that the dynamic magnification in the high frequency vibration region is almost zero, even if the weight is made as large as possible, the weight remains almost horizontal as a piston, and the sliding resistance is kept as small as possible. It is possible to smoothly swing up and down, thereby effectively achieving the desired vibration isolation effect.

Note that the low-friction ring and sleeve are not limited to Teflon materials, and may be made of metal.

15-

[Brief explanation of the drawing]

1 to 8 show embodiments of the present invention.
The figure is a central vertical sectional view showing a first embodiment of the fluid-filled mount according to the present invention, and FIG. 2 is a similar view showing the second embodiment.
Fig. 3 is a central vertical sectional view showing the basic configuration of the fluid man mount to explain the basic principle of the present invention, Fig. 4 is a half-cut drawing showing each effective area of the mount, Fig. 5 is a model diagram, and Fig. 6 The figure is a vertical cross-sectional view of the test device, and Figure 7 is a diagram of its operation.
FIG. 8 is a frequency-dynamic magnification characteristic diagram, and FIG. 9 is a central vertical cross-sectional view of a conventional fluid man-mount. In the drawings, 1 is a fluid mount, 2 is a fluid chamber, 10 is a base member, 11 is a cylindrical body, 20 is a mounting member, 30 is an elastic member that connects the base member and the mounting member, SF is its effective area, 50 is a weight, 51 is a piston body, Sw is its effective area, 60 is an elastic member that supports the weight, 71, 72 and 73 are low friction rings, and 75 is a low friction sleeve. 16- 11 Figure 2 0 0D - method

Claims (1)

[Claims] A fluid chamber is formed by connecting a mounting member connected to a vibration source and a base member for mounting the vibration source with an elastic member to form a fluid chamber therein, and supporting a weight transversely within the fluid chamber. In the human body mount, the weight is constituted by a piston body having an area larger than the effective area of the elastic member, a low friction ring is fitted to the piston body layer, and the above mounting comprises a peripheral wall of the fluid chamber. A low-friction sleeve is fixed in a cylindrical body integral with the member side or the pace member side, and the piston body is slidably fitted into the cylindrical body via the low-friction ring and the sleeve. Fluid person simount.