JPS6073147A - Fluid-contained mount equipment - Google Patents

Abstract

PURPOSE:To increase the damping force with respect to fluid flowing in both directions by forming one vortex valve in the partition plate of a fluid-contained mount equipment and forming, in the valve, communication holes, through which a one-way valve closing one of the holes at the higher liquid pressure side is provided. CONSTITUTION:A partition plate 6 having in the middle thereof a vortex chamber 7 which is a circular cavity is disposed between a fluid chamber 8 and a subsidiary chamber 10 capable of being varied in capacity. A pair of nozzle orifices 16 which are communicated with both the fluid chamber 8 and the subsidiary chamber 10 are formed in the connecting direction of the external circumference of the vortex chamber 7 and besides, communication holes 15a and 15b are formed as respectively opposed to the upper and lower faces of the vortex chamber 7. One-way valves 18 and 19 which close one of the holes by the pressure of the inner liquid are formed outside of both the communication holes. When intense effect of vibration is applied to the fluid chamber 8, the hole 15a is closed so that fluid flows from the nozzle orifices 16 into the vortex chamber 7. In addition to the normal orifice effect, a great damping force due to the differential pressure of vortex at both the side of the internal and external circumferences of the chamber 7 is produced since the hole 15b is being opened. In the reverse case to that, similar effect may be obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a fluid-filled mounting device.

[Prior art]

As a conventional fluid-filled mount device, there is, for example, one previously filed by the same applicant and described in Japanese Unexamined Patent Publication No. 118921/1983. The features of the mount device described in this publication include a first fluid chamber that is interposed between the Power Uniso I and the vehicle body, and has an outer wall made of an elastic body and a first fluid chamber formed inside the outer wall and filled with fluid.
a second bag-like member having an outer wall made of an elastic body and a second fluid chamber formed inside the bag-like member and filled with fluid; and a vortex chamber communicating with one of the fluid chambers through a center hole. and a portex valve consisting of a nozzle hole that opens substantially tangentially to the peripheral wall of the vortex chamber and communicates with the other fluid chamber.

In other words, a portex valve that generates a damping force by a vortex flow is used, and this portex valve generates a large damping force when the flow rate of fluid passing through the valve section is large, and a small damping force when the flow rate of the fluid passing through the valve section is small. Using the property of generating force, Marine 1
- Increasing the amplitude dependence of the vibration damping characteristics of the device, increasing the vibration damping effect near the resonance frequency due to the elastic coefficient of the elastic body of the power unit and mounting device,
This prevents car shake and improves the ride comfort of the vehicle. In response to high-frequency, small-amplitude vibrations, the damping force is reduced to reduce transmission of the vibrations to the vehicle body, thereby reducing noise within the vehicle interior.

[Problems with conventional technology]

However, in such conventional mounting devices, the vortex chamber of I (IM+) has a structure that generates a damping force due to the illusion of fluid flow in one direction, so it is difficult to apply damping force in both directions.・In order for the 511E L to be Ta.

[Purpose of the invention]

The present invention was made by focusing on the inadequacies of such conventional mounting devices, and a vortex chamber is provided in a partition plate that partitions a fluid chamber and a sub-chamber, and this vortex chamber By providing a nozzle hole that communicates between the fluid chamber and the sub-chamber, and a one-way valve that closes the communication hole on the high pressure side of the fluid chamber and the sub-chamber, the above-mentioned inadequacies can be solved. It aims to solve the problem.

[Structure of the invention]

Therefore, in the present invention, one axial direction of the annular vibration isolating rubber is fixed to the supporting body side member, the other side is fixed to the side part of the supported body, and a partition is provided in either one of the two parts A. A plate is fixed, and a fluid chamber is defined by this partition plate, and a sub-chamber whose body shape can be changed is formed on the opposite side of the partition plate from the fluid chamber, and this sub-chamber and the fluid chamber are In the fluid-filled mount device, the fluid chamber and the sub-chamber are connected to each other by a communication hole Bj provided in the partition plate, and the fluid chamber and the sub-chamber are filled with fluid. A vortex chamber is formed that communicates with the next chamber, and the vortex chamber is communicated with the fluid chamber and the sub-chamber through a nozzle hole oriented in a direction crossing the direction in which the communication hole extends. The present invention further relates to a fluid-filled mount device in which the communication hole is provided with a one-way valve that closes only the communication hole on the side where the hydraulic pressure is higher among the fluid chamber and the sub-chamber.

〔Example〕

The present invention will be explained below based on the drawings.

FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention.

First, to explain the formation in (1τ), 1 in Fig. 1 is a vibration isolating rubber. Frame plates 2 and 3 are vulcanized and bonded to the center part and the other outer peripheral part.The center frame plate 2 has a substrate 4 which is the side part of the body to be supported 1h.
The upper side of the vibration isolating rubber 1 is fixed to the power unit via the bolt 5 fixed to the base Fj, 4.

A partition plate 6 in which a circular vortex chamber 7 is formed in the center is fixed to the frame plate 3, and the partition plate 6 closes the lower part of the vibration isolating rubber 1 to form partitions Fj, 6. The top surface and anti-vibration rubber 1
A fluid chamber 8 is defined by the inner peripheral surface of the frame plate 2 and the lower surface of the frame plate 2. On the side of the partition plate 6 opposite to the fluid chamber 8, a sub-chamber 10 whose volume can be changed is formed by facing the diaphragm 9 and surrounded by the upper surface of the diaphragm 9 and the lower surface of the partition plate 6. define. The outer circumferential edge of the diaphragm 9, the outer circumferential edge of the partition plate 6, and the outer circumferential edge of the outer circumferential side frame plate 3 are sequentially overlapped, and the overlapping portion is connected to the substrate 11, which is a support side member.
Pol 1 is clamped and held by the outer peripheral edge of the substrate 11 and fixed to this substrate 11.
-13, the lower side of the anti-vibration rubber 1 is fixed to the body of the automobile. Reference numeral 12 denotes an air chamber surrounded by the diaphragm 9 and the substrate 11, and communicates with the outside air via a through hole 14.

The partition plate 6 consists of an upper piece 6a and a lower piece 6b, and both pieces 6a are arranged so that a vortex chamber 7 with a circular gap is formed in the center.
, 6b are integrally formed by bending. This vortex chamber 7 has a pair of communication holes 15a.

15b and a pair of nozzle holes 16, the fluid chamber 8
The fluid chamber 8, the auxiliary chamber 10, and the vortex chamber 7 are once filled with a liquid (J+η), which is an example of a fluid. The communication holes 15a and 15b are
There are two partition plates 6a that align with each other in the center of the partition plate 6.
and the lower surface plate 6b, and the nostle hole 16 is oriented in a direction that appears to intersect with the direction in which the communication holes 15a and 15b extend, as shown in cross section in the second section 1, and Form parallel to each other.

Further, a valve rod 17 that communicates with the vortex chamber 7 is inserted into the communication holes 15a and 15b, and the end of the valve rod 17 that protrudes into the fluid chamber 8 is made of rubber-like 3111 material. A disk-shaped first valve body 18 formed of a comb-shaped elastic body is fixedly attached, and a disk-shaped second valve body 19 formed of a comb-shaped elastic body is disposed between the lower end protruding into the subchamber lO. stick. 1st. 6. Between the second valve body 18, 19 and the serving handle 6 and between the valve stem 17 and the communication holes 15a, 151+. Second, appropriate gaps are provided in each case, so that when a pressure difference occurs between the fluid pressure in the fluid chamber 8 and the fluid pressure in the auxiliary chamber 10, the valve body on the high pressure side closes due to the pressure difference. The high pressure side communication hole is closed by being pressed toward the plate 6 side.

The valve stem 17 and the first. The fluid chamber 8 and the sub-chamber 1 are connected by the second valve body 18, 19 and the pair of communication holes 15a, 15b.
A one-way valve is constructed that closes only the communication hole on the side where the hydraulic pressure is higher.

Next, the effect will be explained.

In general, the vibration system of a mounting device installed on a vehicle etc. and a power unit elastically supported by the mounting device has a resonant frequency determined by the weight of the power unit and the spring constant of the elastic body of the device. When vibrations near this resonance frequency are applied to the vehicle, vibrations occur in the power unit. The present invention is designed to absorb relatively large amplitude vibrations of the power unit 1- by elastic deformation of the vibration isolating rubber 1, and to apply a damping force by the vortex flow generated in the vortex chamber 7, thereby effectively damping the vibrations. Make it.

That is, when vibrations with relatively large amplitudes are applied to the mount device, the power unit side frame plate 2 and the vehicle body side frame plate 3
The amount of relative displacement between the vibration absorber and the vibration absorber 1 becomes large, and the vibration isolating rubber 1 deforms greatly and elastically absorbs this displacement.

Now, when a displacement is applied that reduces the volume of the fluid chamber 8, the liquid pressure in the fluid chamber 8 increases to the vortex chamber 7 and the subchamber 10.
The pressure difference causes the first valve body 18 of the one-way valve to sit on the "L" surface of the partition plate 6 and close the communication hole 15a on the fluid chamber side. The liquid in the chamber 8 flows into the vortex chamber 7 through the nozzle hole 16 and generates a vortex flow within the vortex chamber 7 . When a vortex is generated in the vortex chamber 7, the pressure on the outside of the vortex is +i'li < and the pressure on the inside is low. This generates a large damping force.

The liquid in the vortex chamber 7 is discharged by the second valve body 19 of the one-way valve.
Separated from J board 6 and connected to the secondary chamber in the center! 'L
151] is open, it flows out into the subchamber 10 through the communication hole 15b. Therefore, when such a large displacement vibration is applied, a damping force due to the pressure difference between the inner and outer circumferences of the vortex is added to the normal orifice effect generated when passing through the nozzle hole 1r3. , the sum of these generates a large damping force, which causes damage to the vehicle body and power unit.
The vibration between 71 and 71 is greatly attenuated, the vibration of the vehicle body is suppressed, and the occurrence of car shake and the like is prevented.

On the other hand, if high-frequency, small-amplitude vibrations such as engine rotational vibrations are applied to this mount device,
The amount of relative displacement between the power unit side frame plate 2 and the vehicle body side frame plate 3 is extremely small, the deformation of the vibration isolating rubber 1 is small, and the volume change of the fluid chamber 8 is also fψ. The pressure difference between the pressure and the liquid pressure in the subchamber 10 and the vortex chamber 7 is small. For this reason, the first and fjs two valve bodies 18, 19 of the one-way valve
are both separated from the partition plate 6, and both speed through holes 15a, 15
Since both b are open, the flow rate of the liquid flowing between the fluid chamber 8 and the subchamber 1 (l) through the one-way valve and the nostle hole 16 is small, and the liquid flows from the fluid chamber 8 into the vortex v7. Even when the fluid flows into the vortex chamber 7, no vortex is generated within the vortex chamber 7.

In other words, when such small displacement vibration is applied,
The pressure difference between the fluid in the vortex chamber 7 is between the nozzle hole I6 and the double-speed passage hole 15.
2.15b and the damping force is greatly reduced, so high frequency and small amplitude vibrations are absorbed and damped only by the elastic deformation of the vibration isolating rubber 1, and the vibrations are transmitted to the vehicle body. It is possible to prevent this from occurring.

Therefore, with a simple structure, damping force can be applied effectively in both directions, and when the one-way valve is operated, the valve stem can
- Since the valve stem moves downward, the velocity of the fluid chamber or sub-chamber increases by the amount of movement of the valve stem, and the damping force can be increased accordingly. Furthermore, when the vibration is negative, the one-way valve operates first and then the damping force becomes effective, and since there is a time lag in the operation, it is possible to provide a degree of freedom in adjusting the vibration transmission characteristics.

In addition, when the anti-vibration rubber 1 is said to have an annular shape, it means that it does not rotate around like a ring, and it can be of course not only a ring but also a polygon such as a square, hexagon, or angle. Good words, of course.

FIGS. 3 and 4 show other embodiments of the invention.

In this embodiment, the nozzle hole 2G is formed so as to be oriented in an arc shape in the circumferential direction at the outer periphery of the vortex chamber 7. That is, a partition plate 27 is provided inside the outer peripheral part of the vortex chamber 7, concentrically with the peripheral wall plate 6c of the vortex chamber 7, and the partition plate 27 defines a nozzle hole 26, so that the liquid passes through an arc-shaped passage. Applying rotational force and making the vortex chamber 7 a structure that facilitates the generation of vortices,
This allows for large damping force to be obtained.

〔Effect of the invention〕

As explained above, in this invention, the partition plate includes
A vortex chamber is formed that communicates with the fluid chamber and the sub-chamber through a communication hole, and this vortex chamber is connected to the fluid chamber by a nozzle hole oriented in a direction crossing the direction in which the communication hole extends. A one-way valve that communicates with the secondary chamber and closes only the communication hole on the side where the liquid pressure is higher between the fluid chamber and the secondary chamber is installed in the communication hole, so that one vortex chamber It is possible to apply a damping force in both directions, when it is in use and when it is contracted.

Therefore, there is no need to provide a vortex chamber for each as in the conventional case, and the structure of the mounting device can be simplified.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the invention, FIG. 2 is a sectional view taken along the line nn of FIG. 1, and FIG. 3 is a main part showing another embodiment of the invention. The sectional view, FIG. 4, is the iv of FIG. 3.
-iv line sectional view. ■... Vibration-proof rubber, 2... Frame plate (supported body side member). 3...Frame plate (support side JA), 6...
- Partition plate, 7... Vortex chamber, 8... Fluid chamber, 9... Diaphragm, 10... Sub-chamber, 15a, 15b... ...Communication hole, 16.2G・
...Nostle hole, F... Valve stem, 18...
...First valve body, 19...Second valve body" 1! i Patent Attorney: Nissan Motor Co., Ltd., Patent Attorney: Tetsuya Mori, Patent Attorney: Yoshiaki Naito, Attorney: Patent Attorney Shimizu Authorized Agent: Patent Attorney Deposit Bond Claims

Claims (1)

[Claims] One end of the annular anti-vibration rubber in the axial direction is fixed to the supporting body side member, and the other is fixed to the supported body side member, and a partition plate is fixed to either of the two members, and the fluid chamber is closed by this partition plate. At the same time, a sub-chamber whose volume can be changed is formed on the opposite side of the partition plate from the fluid chamber, and this sub-chamber and the fluid chamber are connected to each other through a communication hole provided in the partition plate. In the fluid-filled lounge device, in which the fluid chamber and the auxiliary chamber are in communication with each other, and the fluid chamber and the auxiliary chamber are filled with fluid, the fluid chamber and the auxiliary chamber are connected to each other through the communication hole in the partition plate. forming a chamber, communicating this vortex chamber with the fluid chamber and the sub-chamber through nozzle holes oriented in a direction that appears to intersect with the extending direction of the communication hole, and further communicating with the communication hole, A fluid-filled mount device characterized in that a one-way valve (LJ) is installed to close only the communication hole on the side where the liquid pressure is higher among the fluid chamber and the sub-chamber.