JPH05248480A - Liquid-sealed type mount - Google Patents

Abstract

PURPOSE:To prevent the rise of a dynamic spring during switching of an orifice. CONSTITUTION:A main liquid chamber 3 surrounded with a resilient body 2 is formed on the upper surface side of a partition wall 1 and an auxiliary liquid chamber 5 surrounded with a diaphragm 4 is formed on the under surface side. A large orifice having the one end communicated to the main liquid chamber 3 and the other end communicated with the auxiliary chamber 5 and a small orifice 10 having the one end communicated with the main liquid chamber and the other end communicated with a large orifice 7 are formed in a partition wall 1. Anon-off valve 12 to open and close a communication state between the large orifice 7 and the main liquid chamber 3 and between the small orifice 10 and the main liquid chamber 3 is rotatably arranged to the partition wall. When a communication state between the main liquid chamber 3 and the auxiliary liquid chamber 5 is switched from the large orifice 7 to the small orifice 10 through the on-off valve 12, the section of the flow passage of the communicating part between the main liquid chamber 3 and the large orifice 7 is kept at a constant value within the given rotation range of the on-off valve 12 and the length of the large orifice is also kept at a constant value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount for supporting a vibration body such as an automobile engine in a vibration-proof manner, and more particularly to a liquid-filled mount in which a liquid is filled.

[0002]

2. Description of the Related Art Generally, in a vibrating body such as an automobile engine, various vibrations having different frequencies and amplitudes are generated depending on the rotational state, that is, the number of revolutions. There is a strong demand for an anti-vibration device that can effectively damp the vibration of the.

As a vibration isolator for damping such a wide range of vibration, for example, the vibration isolator disclosed in Japanese Patent Application Laid-Open No. 2-46337 is already known. This vibration isolator has a fluid sealed inside. A fluid-filled type vibration damping device, in which a main fluid chamber surrounded by an elastic body is formed on the upper surface side of the partition wall, and a sub-fluid chamber surrounded by a diaphragm is formed on the lower surface side of the partition wall, and both fluids are formed. A non-compressible fluid such as water or oil is enclosed in the chamber, and further, the partition wall is provided with a small-diameter orifice and a large-diameter orifice that communicate between the main fluid chamber and the sub-fluid chamber. It is a thing.

The elastic body is fixed to the engine side, which is a vibrating body, and the diaphragm is fixed to the chassis side, which is a support body, so that various vibrations from the engine side are prevented from being transmitted to the chassis side. Is becoming

That is, when the engine speed is in the idling range, the rotary valve is operated to connect the main fluid chamber and the sub-fluid chamber via the large-diameter orifice, thereby vibrating in the idling range. If the engine speed is in the running range, the rotary valve is operated to switch from the large diameter orifice to the small diameter orifice.
By connecting the main fluid chamber and the sub-fluid chamber via a small-diameter orifice, shock vibrations and the like in the traveling range are damped.

However, in the conventional vibration isolator constructed as described above, when switching the communication state of the main fluid chamber and the sub fluid chamber from the large diameter orifice to the small diameter orifice, the large diameter orifice is used. Since the cross-section of the flow path of the communication part between the main liquid chamber and the main fluid chamber is gradually blocked following the rotation of the rotary valve, and when it is completely blocked, it switches to a small diameter orifice. , The orifice characteristics are a → b → c in Fig. 4.
→ As shown in d, the frequency changes in the order of decreasing frequency. Therefore, when the idle mode (a) suddenly accelerates to the shock mode (d), the dynamic spring moves as shown by the broken line in the figure. There is a problem in that the sound spring is suddenly raised, and the sound vibration is transmitted by the sudden rise of the dynamic spring.

The present invention solves the above-mentioned problems of the conventional one, and when switching the communication state between the main liquid chamber and the sub liquid chamber from the large diameter orifice to the small diameter orifice. It is an object of the present invention to provide a liquid-filled mount capable of preventing the generation of sound vibration due to the sudden rise of the dynamic spring by suppressing the rapid rise of the dynamic spring.

[0008]

In order to solve the above problems, the present invention is directed to a main liquid chamber surrounded by an elastic body on the upper surface side of a partition wall and a sub liquid chamber surrounded by a diaphragm on the lower surface side. And a large diameter orifice having one end communicating with the main liquid chamber and the other end communicating with the sub liquid chamber,
And a small-diameter orifice whose one end is in communication with the main liquid chamber and the other end is in communication with the large-diameter orifice and has a smaller flow passage cross-section than the large-diameter orifice. A large-diameter orifice and the main liquid chamber, and a small-diameter orifice and the main liquid chamber can be opened / closed, and the main liquid chamber and the sub liquid chamber can be opened or closed depending on the turning position of the opening / closing valve. In a liquid-filled mount in which the communication between the main liquid chamber and the sub liquid chamber is switched from the large diameter orifice to the small diameter orifice, Within the predetermined turning range of the on-off valve, the flow passage cross section of the communication portion between the large diameter orifice and the main liquid chamber is kept at the initial size, and the length of the large diameter orifice is set to the initial length. Keep this, then the communication There is obtained gradually from the large diameter orifice to switch to the small diameter orifice when it is fully occluded go is closed, it employs a means of constructed the communicating portion. Further, the communication part is composed of an opening communicating with the large-diameter orifice provided in the partition wall, and an opening communicating with the main liquid chamber provided in the opening / closing valve having a larger flow passage cross section than the opening, When the on-off valve is rotated to a predetermined position, a front portion in the rotation direction of the opening on the partition valve side matches the opening on the partition wall side, and a large diameter orifice is provided through the matched portion. Communicates with the main liquid chamber,
After that, when the on-off valve is rotated to switch the communication state between the two liquid chambers to the small diameter orifice, the flow passage cross section of the communication portion is maintained at the initial size within the predetermined rotation range of the on-off valve. At the same time, the length of the large diameter orifice is kept at the initial length,
After that, when the communication part is gradually closed and completely closed, the large diameter orifice is changed so that the communication state between the main liquid chamber and the sub liquid chamber is switched from the large diameter orifice to the small diameter orifice. The size and position of the opening and the opening of the on-off valve are set.

[0009]

According to the present invention, by adopting the above-mentioned means, when the communication state between the main liquid chamber and the sub liquid chamber is switched from the large diameter orifice to the small diameter orifice by the rotation of the opening / closing valve, Within the predetermined range of rotation, the cross-section of the passage between the large-diameter orifice and the main liquid chamber was kept at the initial size, and the length of the large-diameter orifice was kept at the initial length. Will be done. Then, after this, the communication part is gradually closed, and when it is completely closed, the large-diameter orifice is switched to the small-diameter orifice, so that there is no sudden rise of the dynamic spring when the orifice is switched. It will be.

[0010]

Embodiments of the present invention shown in the drawings will be described below. 1 and 2 show an embodiment of a liquid-filled mount according to the present invention. FIG. 1 is a schematic vertical sectional view showing the whole of the mount, which is viewed along line XX in FIG. 2 is a partial cross-sectional view taken along the line YY of FIG.

That is, in the liquid-filled mount shown in this embodiment, the main liquid chamber 3 surrounded by the elastic body 2 is formed on the upper surface side of the partition wall 1, and the lower surface side of the partition wall 1 is surrounded by the diaphragm 4. A sub liquid chamber 5 is formed, and an incompressible liquid 6 such as water or oil is enclosed in both liquid chambers 3 and 5, and further,
The partition wall 1 has a large diameter orifice 7 having one end communicating with the main liquid chamber 3 through an opening 8 and the other end communicating with the sub liquid chamber 5 through a communication hole 9, and an opening 11 at one end. And a small diameter orifice 10 communicating with the main liquid chamber 3 via the other end and the other end communicating with one end of the large diameter orifice 7.
An on-off valve 12 is rotatably provided on the partition wall 1 so that the on-off valve 1
By turning 2, the opening 8 of the large diameter orifice 7 and the main liquid chamber 3 can be opened and closed, and the opening 11 of the small diameter orifice 10 and the main liquid chamber 3 are always opened. It is configured as possible.

The partition wall 1 has a disk shape, and a recess 18 having a predetermined depth is formed in the central portion on the upper surface side.
The peripheral edge of the recess 18 is larger than the large-diameter orifice 7 having a rectangular arc-shaped cross-section with an open upper surface so as to surround the recess 18, and the large-diameter orifice 7 communicating with one end of the large-diameter orifice 7. A small-diameter orifice 10 having a rectangular cross-section with an open upper surface side having a small cross-section and having an arc shape is continuously formed.

One end of the small diameter orifice 10 communicates with the inside of the recess 18 through an opening 11 having a cross section larger than the flow passage cross section of the small diameter orifice 10.
One end of the large diameter orifice 7 communicates with the inside of the recess 18 through an opening 8 having a cross section larger than the flow passage cross section of the large diameter orifice 7, and the other end of the large diameter orifice 7 has a partition through an arcuate communication hole 9. 1, a lid member 21 is provided on the upper surface side of the partition wall 1, and by this lid member 21, the upper surface side opening portion of the large diameter orifice 7 and the upper surface side opening of the small diameter orifice 10 are provided. The part is closed.

The on-off valve 12 has a cylindrical side wall 13,
A disc-shaped bottom plate 14 that closes the lower end opening of the side wall 13.
And a bar-shaped protruding portion 15 which is integrally provided in the central portion of the lower surface of the bottom plate 14 and which protrudes downward in the drawing. In this case, the side wall 13 is rotatable in the recess 18 of the partition wall 1. An opening 16 penetrating the inside and outside of the side wall 13 longer (larger) than the opening 8 of the large-diameter orifice 7 at an appropriate position of the side wall 13; Further, an opening 17 penetrating the inside and outside of the side wall 13 having a length (size) about 5 times as large as the opening 11 of the small diameter orifice 10 is formed.

The positional relationship between the openings 16 and 17 is such that the front portion of the opening 16 of the large diameter orifice 7 on the opening / closing valve 12 side in the direction of rotation overlaps the opening 8 of the large diameter orifice 7 on the partition wall 1 side. , The opening 11 of the small-diameter orifice 10 on the side of the partition wall 1
Further, the positional relationship is such that the front end portion in the rotation direction of the opening portion 11 of the small diameter orifice 10 on the opening / closing valve 12 side matches so that the flow passage cross section is secured.

The diaphragm 4 has a disk shape, and its peripheral portion is clamped and fixed between the peripheral portion of the lower surface of the partition wall 1 and the peripheral portion of the bowl-shaped lower case 22. The sub liquid chamber 5 in which the liquid 6 is enclosed is formed between the sub liquid chamber 5 and the lower surface of the partition wall 1.

The opening / closing valve 12 is rotatably fitted in the recess 18 of the partition wall 1. In this case, the opening / closing valve 1 is
The second projecting portion 15 penetrates the partition wall 1 and projects to the lower surface side of the partition wall 1. This projecting projecting portion 15 is of a drive source 24 such as a pulse motor attached to the central portion of the lower case 22. It is adapted to be connected to the drive shaft 24a.

Reference numeral 25 is a bearing that rotatably supports the on-off valve 12.

A lower end portion of a cylindrical upper case 23 is caulked to the outer peripheral surface of the partition wall 1, and a boss portion 26 is provided inside the upper end portion of the upper case 23 at a predetermined interval. Is located, and the boss portion 26 and the upper end portion of the upper case 23 are integrally connected by an elastic body 2, and the elastic body 2 encloses a liquid 6 on the upper surface side of the partition wall 1 to form a main liquid chamber 3 Are formed.

Then, as described above, the main liquid chamber 3 surrounded by the elastic body 2 is provided on the upper surface side of the partition wall 1, and the diaphragm 4 is provided on the lower surface side.
By forming the sub liquid chamber 5 surrounded by, the two liquid chambers 3 and 5 are communicated with each other through the large diameter orifice 7 or the small diameter orifice 10 provided in the partition wall 1.

Next, the operation of the above will be described. First, the boss portion 26 is connected to an unillustrated engine side which is a vibrating body, and the lower case 22 is connected to an unillustrated chassis side which is a support body to start the engine.

When the rotation of the engine is in the idling region, the opening / closing valve 12 is operated by the operation of the drive source 24, and the opening 1 of the large-diameter orifice 7 of the opening / closing valve 12 is operated.
The front portion in the rotation direction of 6 is superposed on the opening 8 of the large-diameter orifice 7 of the partition wall 1, and the main liquid chamber 3 and the large-diameter orifice 7 are connected through the openings 8 and 16 in the superposed state. The main liquid chamber 3 and the sub liquid chamber 5 are communicated with each other through the large diameter orifice 7.

When the engine vibration is input to the elastic body 2 through the boss portion 26, the vibration causes the elastic body 2 to move.
Is displaced downward in the drawing, the volume of the main liquid chamber 3 is narrowed, and the liquid 6 in the main liquid chamber 3 flows into the large diameter orifice 7 and flows in the large diameter orifice 7 to the side of the sub liquid chamber 5 side. And the volume of the sub liquid chamber 5 is increased by being combined with the liquid 6 in the sub liquid chamber 5, and the diaphragm 4 located below the sub liquid chamber 5 is displaced downward in the drawing.

Then, due to the restoring force of the diaphragm 4,
The volume of the sub liquid chamber 5 is narrowed, the liquid 6 in the sub liquid chamber 5 flows into the large diameter orifice 7, flows in the large diameter orifice 7 and moves to the main liquid chamber 3 side, and then inside the main liquid chamber 3. Combined with the liquid 6 of FIG. 3 increases the volume of the main liquid chamber 3.

Due to the flow resistance when the liquid 6 moves between the main liquid chamber 3 and the sub liquid chamber 5 via the large-diameter orifice 7, the vibration input from the engine can be attenuated. Become.

In this case, the small-diameter orifice 10 on the side of the partition wall 1
Since the opening 11 of the small-diameter orifice 10 of the small-diameter orifice 10 on the on-off valve 12 side coincides with the front end of the opening 17 of the small-diameter orifice 10 in the rotation direction, the small-diameter orifice 10 and the main liquid chamber 3 are connected through the openings 11 and 17.
The small diameter orifice 10
Since the pressure is higher in the openings 11 and 17 on the side of the large diameter orifice 7 than in the openings 8 and 16 on the side of the large diameter orifice 7, liquid is introduced into the small diameter orifice 10 through the openings 11 and 17 on the side of the small diameter orifice 10. 6 will not flow in, and most of the liquid 6 will flow into the large diameter orifice 7 through the openings 8 and 16 on the large diameter orifice 7 side.

Next, when the rotation of the engine is in the traveling range, the opening / closing valve 12 is rotated by the operation of the drive source 24 to increase the communication state between the main liquid chamber 3 and the sub liquid chamber 5. The small diameter orifice 7 is switched to the small diameter orifice 10, and the main liquid chamber 3 and the sub liquid chamber 5 are communicated with each other via the small diameter orifice 10.

Then, as in the case of the large-diameter orifice 7 described above, through the small-diameter orifice 10, due to the flow resistance when the liquid 6 moves between the main liquid chamber 3 and the sub-liquid chamber 5, It is possible to damp shock vibrations and the like in the traveling range.

In this case, from the position where the on-off valve 12 starts to rotate to a predetermined rotation angle, the opening 8 of the large-diameter orifice 7 on the partition wall 1 side is overlapped with the front portion of the on-off valve 12 in the rotational direction. Therefore, until the rear end in the rotational direction of the opening on the side of the on-off valve 12 passes through the rear end in the rotational direction of the opening of the partition wall, the flow path of the communication portion between the main liquid chamber and the large diameter orifice is formed. The cross section will be kept at the initial size, and after that, the flow path cross section of the communication part gradually decreases following the rotation of the on-off valve, and when it is completely closed thereafter, Main liquid chamber 3
The communication state between the sub-liquid chamber 5 and the sub-liquid chamber 5 is switched from the large-diameter orifice 7 to the small-diameter orifice 10.

The orifice characteristic in this case is that the cross-section of the flow passage of the communication portion between the large-diameter orifice 7 and the main liquid chamber is kept at the initial size within the predetermined turning range of the on-off valve, and By configuring to keep the length at the initial value,
Even when suddenly accelerating from the idle mode (A) to the shock mode (C), the moving spring follows the idle mode (A) from the acceleration start position to a certain position as shown by the arrow in the figure. A characteristic that the temperature gradually rises and then shifts to the shock mode curve (C) via the B curve is obtained. Therefore, it is possible to suppress a rapid rise of the dynamic spring.

As described above, in the vibration isolator according to this embodiment, when the communication state between the main liquid chamber 3 and the sub liquid chamber 5 is switched from the large diameter orifice 7 to the small diameter orifice 10, a large diameter orifice is used. The flow passage cross section of the communicating portion 20 between the orifice 7 and the main liquid chamber 3 is kept at an initial value within the predetermined rotation range of the opening / closing valve 12, and the length of the large diameter orifice is kept at the initial length. After that, when the communication part is completely closed, the large-diameter orifice is switched to the small-diameter orifice, so that even when the idle mode suddenly accelerates to the shock mode, the dynamic spring Can be gradually increased to a higher frequency after being gradually increased to a predetermined frequency along the idle mode, so that the dynamic spring does not rise sharply during switching. Runode, becomes possible to completely prevent the generation of noise vibrations due to a rapid increase in dynamic spring.

[0032]

As described above, according to the present invention, after the main liquid chamber and the sub liquid chamber are communicated with each other through the large diameter orifice, the communication state of both liquid chambers is changed by turning the opening / closing valve. When switching from a small-diameter orifice to a small-diameter orifice, keep the flow passage cross-section of the communication part between the large-diameter orifice and the main liquid chamber constant within the predetermined turning range of the on-off valve, and also keep the length of the large-diameter orifice constant. By doing so, it is possible to suppress the sudden rise of the dynamic spring when switching the communication state between the main liquid chamber and the sub liquid chamber from the large diameter orifice to the small diameter orifice, and thereby to accelerate rapidly from the idle mode. Even in the shock mode, the dynamic spring does not suddenly rise, so it is possible to completely prevent the generation of noise and vibration when switching, and thus comfortable driving performance can be obtained. etc And it has a superior effect.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing an embodiment of a liquid-filled mount according to the present invention and is a cross-sectional view taken along line XX of FIG.

FIG. 2 is a partial cross-sectional view of what is shown in FIG. 1 taken along line YY.

FIG. 3 is an explanatory diagram showing the orifice characteristics of the one shown in FIG.

FIG. 4 is an explanatory diagram showing conventional orifice characteristics.

[Explanation of symbols]

 1 ... Partition 2 ... Rubber-like elastic body 3 ... Main liquid chamber 4 ... Diaphragm 5 ... Sub liquid chamber 6 ... Liquid 7 ... Large diameter orifice 8 ... Opening portion 9 ... Communication hole 10 ... Small-diameter orifice 11 …… Opening part 12 …… Opening / closing valve 13 …… Side wall 14 …… Bottom plate 15 …… Projecting part 16 …… Opening part 17 …… Opening part 18 …… Recess part 20 …… Communicating part 21 …… Lid member 22 ...... Lower case 23 ...... Upper case 24 ...... Drive source 24a ...... Drive shaft 25 ...... Bearing 26 ...... Boss part

Claims (2)

[Claims] 1. A main liquid chamber (3) surrounded by an elastic body (2) is provided on the upper surface side of the partition (1), and a sub liquid chamber (5) surrounded by a diaphragm (4) is provided on the lower surface side. In addition, one end of the partition wall (1) communicates with the main liquid chamber (3) and the other end communicates with the sub liquid chamber (5), and a large diameter orifice (7), and one end of the main liquid chamber (3). ) And a small-diameter orifice (10) having a smaller flow passage cross section than the large-diameter orifice (7) having the other end communicating with the large-diameter orifice (7), and further, an opening / closing valve (10) is provided on the partition wall (1). 12) rotatably provided to open and close between the large diameter orifice (7) and the main liquid chamber (3) and between the small diameter orifice (10) and the main liquid chamber (3). The large diameter orifice is provided between the main liquid chamber (3) and the sub liquid chamber (5) depending on the turning position of the on-off valve (12). In the liquid-filled mount adapted to communicate with each other through the device (7) or the small-diameter orifice (10).
When switching the communication state with the large diameter orifice (7) to the small diameter orifice (10), the large diameter orifice (7) and the main liquid chamber (3) are within the predetermined rotation range of the opening / closing valve (12). The flow passage cross section of the communication part (20) is maintained at the initial size, and the length of the large diameter orifice (7) is maintained at the initial length, after which the communication part (20) is gradually Large-diameter orifice (7) when closed and completely closed
The liquid-filled mount, wherein the communication part (20) is configured so as to switch from the small diameter orifice (10) to the small diameter orifice (10). 2. The communication part (20) comprises the partition wall (1).
To an opening (8) communicating with the large diameter orifice (7) provided in the opening, and to the main liquid chamber (3) provided in the opening / closing valve (12) having a larger flow passage cross section than the opening (8). An opening (16) and an opening (8) on the side of the partition (1) when the on-off valve (12) is rotated to a predetermined position.
The front portion of the opening (16) on the opening / closing valve (12) side in the direction of rotation coincides with the opening, and the large-diameter orifice (7) and the main liquid chamber (3) are connected via this coincident portion. Communication, after this,
When the on-off valve (12) is rotated to switch the communication state between the liquid chambers (3) and (5) to the small-diameter orifice (10), within the predetermined rotation range of the on-off valve (12), the communication portion ( The cross section of the flow passage of 20) is kept at the initial size, and the length of the large diameter orifice (7) is kept at the initial length, after which the communicating portion (20) is gradually closed. When completely closed, the communication between the main liquid chamber (3) and the auxiliary liquid chamber (5) changes from the large diameter orifice (7) to the small diameter orifice (10).
The size and position of the opening (8) of the large-diameter orifice (7) and the opening (16) of the on-off valve (12) are set so as to switch to the liquid-filled type. mount.