JPH0318758Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a liquid-filled mount, and in particular,
The present invention relates to a liquid-filled mount that can optimize the spring constant and damping force in a high frequency range in response to vibrations from an internal combustion engine or the like.

[Prior art and its problems]

In general, in order to minimize the transmission of vibrations from a vibration source such as an internal combustion engine to external components that support it, a liquid-filled mount is used to damp vibrations from the vibration source. A liquid-filled mount for damping such vibrations is shown in FIG.

The liquid-filled mount shown in Figure 3 is
A main body part 2 having a threaded part 1 that receives vibration input from a vibration generating source such as an internal combustion engine (not shown); an elastic body 4 connected to the main body part 2 via a fixing member 3; an orifice plate 5 disposed opposite to the inner wall surface of a cavity hollowed out in the center of the orifice plate 5, and having a plurality of holes 5a bored in the upper surface;
A first chamber 6 is formed between the orifice plate 5 and the elastic body 4, and a spiral groove 7a is provided on the circumferential surface of the orifice plate 5. A disc-shaped orifice body 7 is formed with an orifice 11 opening on the upper surface of the orifice plate 5, and has a plurality of holes 7b facing the plurality of holes 5a of the orifice plate 5.
An auxiliary diaphragm 8 located in the space between the upper surface and the upper surface of the disk-shaped orifice body 7, a main diaphragm 9 disposed opposite to the bottom surface of the disk-shaped orifice body 7, and this main diaphragm 9. A second chamber 10 is formed between the disk-shaped orifice body 7 and communicates with the first chamber 6 via the orifice 11. is filled with liquid.

Regarding the operation of the conventional liquid-filled mount configured as described above, first, when vibrations from a vibration source such as an internal combustion engine are input to the main body part 2 through the threaded part 1, the vibrations are It is received by the elastic body 4 and attenuated, and the elastic body 4 is pushed downward, and when the input vibration is a low frequency, the first vibration is
Reduce chamber 6.

Therefore, the liquid inside the first chamber 6 is pushed downward, flows into the inside of the spiral orifice 11 through the hole in the orifice plate 5, flows inside this orifice 11, and flows into the second chamber 10. It's becoming like that.

Therefore, the internal volume of the second chamber 10 is increased together with the liquid filled inside the second chamber 10, thereby pushing down the main diaphragm 9, and in this way. The liquid inside the second chamber 10, whose volume has been increased, flows into the first chamber 6 through the orifice 11 again, and this process is repeated.

And, as mentioned above, the first chamber 6 and the second chamber 10
The vibration from the vibration source is damped by the resistance when the liquid flows through the orifice flow path between the

In addition, when the input vibration is a high frequency, the upper surface of the orifice plate 5 and the disc-shaped orifice body 7 are connected to each other.
The liquid in the first chamber 6 pushes the auxiliary diaphragm 8 located in the space between the upper surface and the upper surface through the holes 5a and 7b, and moves and deforms the auxiliary diaphragm 8 within a small gap to cause vibration. It is starting to attenuate.

However, in the conventional liquid-filled mount configured as described above, the mount is located in the cavity formed between the disc-shaped orifice body 7 and the orifice plate 5; Since the tension of the auxiliary diaphragm 8 that blocks communication between the two chambers 10 is constant, the dynamic spring constant is constant. Therefore, when the input high frequency changes due to the vibration source, had the problem that it was not possible to obtain an appropriate dynamic spring constant.

This invention solves the problems of the conventional ones as described above, and by making it possible to change the tension of the auxiliary diaphragm that acts when high-frequency vibrations are input, the dynamic spring constant in the high-frequency range can be improved. The object of the present invention is to provide a liquid-filled mount that can change the dynamic spring constant to be optimal for the input high frequency.

[Means for solving problems]

In order to solve the above problems, this invention consists of a main body that receives vibration input from a vibration source, an elastic body connected to the main body, and an inner space hollowed out in the center of the elastic body. An orifice that is arranged opposite to a wall surface, has a through hole in the center that opens into the inner wall surface, and has a spiral groove that slopes smoothly at the peripheral edge of the upper and lower surfaces and becomes deeper in sequence, communicating the upper and lower surfaces. an auxiliary diaphragm fixing member consisting of a movable side plate and a fixed side plate, an auxiliary diaphragm located at an open end of the auxiliary diaphragm fixing member and closing the through hole, and a auxiliary diaphragm and the elastic body. a first chamber formed between the hollow space, a main diaphragm attached to the lower surface of the auxiliary diaphragm fixing member, a second chamber formed by the main diaphragm and the auxiliary diaphragm fixing member, and an external operation The apparatus is equipped with an auxiliary diaphragm tension adjustment mechanism that can change the tension of the auxiliary diaphragm by adjusting the tension of the auxiliary diaphragm, and employs a means in which liquid is sealed inside the first and second chambers.

[Effect]

This device connects an elastic body to a main body that is attached to a vibration source and receives vibration input, has a through hole in the center that opens to the inner wall surface, and has a smoothly inclined periphery on the upper and lower surfaces. An auxiliary diaphragm fixing member consisting of a movable side plate and a stationary side plate has an orifice consisting of a spiral groove that gradually becomes deeper and communicates with the upper and lower surfaces, and an inner wall surface of a cavity hollowed out in the center of the elastic body. An auxiliary diaphragm is provided opposite to the elastic body, the peripheral edge of which is clamped and fixed between the fixed side plate and the movable side plate, and is located at the open end and closes the through hole, and the auxiliary diaphragm and the elastic body A first chamber is formed between the hollow space of the fixed side plate, a main diaphragm is attached to the lower surface of the fixed side plate, and a second chamber is formed between the main diaphragm and the fixed side plate. A liquid is sealed inside and allowed to flow through the orifice, and the auxiliary diaphragm is provided with an auxiliary diaphragm tension adjustment mechanism that can change its tension. At times, the liquid in the first and second chambers is damped by passing through the orifice, and at high frequencies and small amplitudes, the liquid has a low dynamic spring constant due to the action of the auxiliary diaphragm. Moreover, since the tension of the auxiliary diaphragm can be changed by adjusting the auxiliary diaphragm tension adjustment mechanism, it can be set to the input vibration for which a low dynamic spring constant is desired, so that the tension can be adjusted according to the input vibration. This means that the optimum condition can be achieved.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

1 and 2 show a liquid-filled mount according to this invention, in which the same parts as those of the conventional one are given the same numbers and detailed explanations are omitted. A fixed side plate 15 is provided opposite to the inner wall surface of a cavity hollowed out at the center of the fixed side plate 15, and a through hole 16 is provided in the center of the fixed side plate 15, the lower end is closed, and the upper surface is closed. is provided with an enlarged hole portion 16a.

An annular movable plate 18 is located within the enlarged hole portion 16a, and the annular movable plate 18 is provided with a disc-shaped tooth portion 17 located inside the through hole 16 on the lower surface. There is a fixed piece 1 inside
An auxiliary diaphragm 20 is clamped and fixed at its edge between the auxiliary diaphragm 20 and the fixed plate 15, and the through hole 16 of the stationary plate 15 is closed by the auxiliary diaphragm 20.

The fixed side plate 15 and the movable side plate 18 constitute an auxiliary diaphragm fixing member 22, and the auxiliary diaphragm 20 fixed by the auxiliary diaphragm fixing member 22 has both sides of the base cloth covered with an elastic material. , a so-called diaphragm with base fabric is used, and therefore the strength is greatly improved.

Further, the fixed side plate 15 is provided with a groove 15a having an occluded circular shape and gradually increasing in depth on its upper and lower surfaces, and the deepest part of the groove 15a is located on the fixed side plate 15. They communicate through a circumferentially long through hole 15b that passes through the
An orifice having a spiral shape as a whole is formed, and the movable plate 18 is also provided with a similar orifice.

A hole 1 is provided at the closed end of the stationary plate 15.
5c is drilled, and the fixed side plate 15
Inside, there is an auxiliary diaphragm tension adjustment mechanism 23.
is provided.

The auxiliary diaphragm tension adjustment mechanism 23 has a shaft 24 erected at the center inside the stationary plate 15, and is located on the outside of this shaft 24, and is arranged vertically by, for example, a key and a keyway. It has an umbrella-shaped boss 25 that is movable but not rotatable, and whose upper surface abuts the lower surface of the auxiliary diaphragm 20, and a gear mechanism that transmits driving force to the boss 25.

The gear mechanism that rotates the boss 25 by an external operation has teeth on the outer circumferential surface of the boss 25 and internal teeth that mesh with the teeth and have teeth on the outside. A gear 26 is provided, and a gear 28 is provided on a shaft 27 that is rotated by an external operation and meshes with the gear 26.

Further, a gear 29 meshes and engages with the disc-shaped tooth portion 17 provided on the lower surface of the movable plate 18, and this gear 29 is externally connected via a shaft 30 passing through the stationary plate 15. It is rotatable.

A main diaphragm 32 is attached to the lower surface of the fixed plate 15 together with a lid 31, and a second chamber 33 is formed between the main diaphragm 32 and the fixed plate 15. A first chamber 34 is formed between the plate 18 and the elastic body 4.

Therefore, the first chamber 34 and the second chamber 33 communicate with each other through a spiral orifice provided in the movable plate 18 and a spiral orifice provided in the fixed plate 15, and also communicate with each other through the spiral orifice provided in the movable plate 18 and the fixed plate 15. The orifices provided in 18 have the same radius and are long through holes 15b and 18 in the circumferential direction.
a, the groove 15a provided on the upper surface of the fixed plate 15 forms a closed channel in alignment with the groove on the lower surface of the movable plate 18, and this channel is formed on the movable plate 18. The through hole 18a and the through hole 15b of the fixed plate 15 communicate with each other, so that an orifice is formed therebetween. The length of the orifice that communicates between the two can be changed.

Regarding the operation of the liquid-filled mount configured as described above, first, in the low frequency range where the input vibration from the vibration source is low frequency and large amplitude, the input vibration is located outside the fixed side plate 15. Axis 3
By rotating the fixed side plate 15
The length of the orifice can be changed in accordance with this rotation by rotating the movable plate 18 relative to the orifice. Therefore, it is possible to exhibit a damping effect, and in this way, the magnitude of the damping in the low frequency range and the peak frequency can be arbitrarily set.

Furthermore, when the input vibration from the vibration source is high frequency and small amplitude, rotating the shaft 27 located outside the fixed side plate 15 causes the auxiliary member whose edge is clamped and fixed to the movable side plate 18 to rotate. Since the lower surface of the diaphragm 20 is pressed by the umbrella-shaped portion of the boss 25, the tension of the auxiliary diaphragm 20 can be adjusted because the boss 25 moves up and down in accordance with the rotation of the shaft 27. This allows for a low dynamic spring constant during high frequency input.

Therefore, in the high frequency range, the auxiliary diaphragm 20
By being able to adjust the tension of the mount and changing the length of the orifice in the low frequency range, the mount characteristics can be changed depending on the input vibration from the vibration source, making it possible to apply it to a wide range of areas.

In the embodiment described above, a gear mechanism was used to move the boss up and down by rotating gears as a means for adjusting the tension of the auxiliary diaphragm 20.
It may be a mechanism that directly moves the push-pull rod up and down, or it may be a rack-and-pinion or jack type, and there are various mechanisms that rotate the movable plate relative to the fixed plate. If the tension of the auxiliary diaphragm is controlled by detecting the vibration of the vibration source, for example, in the case of an internal combustion engine, the tension of the auxiliary diaphragm can be adjusted according to the rotation speed. In addition, if the movable side plate is rotated according to the vibration source, an optimal low dynamic spring constant can be obtained in the high frequency range. This allows the optimum state to be achieved.

[Effect of idea]

This idea connects an elastic body to a main body that is attached to a vibration source and receives vibration input, has a through hole in the center that opens to the inner wall surface, and has smooth slopes on the periphery of the upper and lower surfaces. An auxiliary diaphragm fixing member consisting of a movable side plate and a stationary side plate, which has an orifice consisting of a spiral groove that gradually becomes deeper and communicates the upper and lower surfaces, is attached to the inner wall surface of the cavity hollowed out in the center of the elastic body. An auxiliary diaphragm is provided facing each other, a peripheral edge portion of which is clamped and fixed between the fixed side plate and the movable side plate, and is located at an open end to close the through hole, and the auxiliary diaphragm and the elastic body are connected to each other. A first chamber is formed between the hollow space, a main diaphragm is attached to the lower surface of the fixed plate, a second chamber is formed between it and the fixed side plate, and a second chamber is formed between the first chamber and the second chamber. The liquid is sealed and allowed to flow through the orifice, and the auxiliary diaphragm is provided with an auxiliary diaphragm tension adjustment mechanism that can change the tension of the auxiliary diaphragm. is attenuated by the orifice, and can be made to have a low dynamic spring constant at high frequencies and small amplitudes, and the tension of the auxiliary diaphragm can be changed by adjusting the auxiliary diaphragm adjustment mechanism. By being able to do this, it is possible to obtain an optimal low dynamic spring constant depending on the input vibration, and this has excellent effects such as being able to arbitrarily set the characteristics in the high frequency range.

[Brief explanation of drawings]

Figure 1 is a schematic sectional view of the liquid-filled mount according to this invention, Figure 2 is a schematic plan view of the one shown in Figure 1 with a portion removed, and Figure 3 is a schematic sectional view of the conventional mount. It is. DESCRIPTION OF SYMBOLS 1... Thread part, 2... Main body part, 3... Fixing member, 4... Elastic body, 5... Orifice plate,
5a, 7b, 15c...hole, 6, 34...first
Chamber, 7...Disc-shaped orifice body, 7a, 15a...
... Groove, 8, 20 ... Auxiliary diaphragm, 9, 32
...Main diaphragm, 10,33...Second chamber, 1
1... Orifice, 15... Fixed side plate, 1
5b, 16, 18a...Through hole, 16a...Enlarged hole portion, 17...Disc-shaped tooth portion, 18...Movable side plate, 19...Fixing piece, 22...Auxiliary diaphragm fixing member, 23... Auxiliary diaphragm tension adjustment mechanism, 24, 27, 30...shaft, 25...boss,
26, 28, 29...gear, 31...lid.

Claims (1)

[Claims for Utility Model Registration] (1) A main body portion 2 that receives vibration input from a vibration source;
An elastic body 4 connected to the main body 2, and a through hole 16 that is disposed opposite to the inner wall surface of a cavity hollowed out in the center of the elastic body 4 and that opens to the inner wall surface at the center. In addition, there is an auxiliary diaphragm fixing member 22 having an orifice formed of a spiral groove that is smoothly inclined at the peripheral edge of the upper and lower surfaces and gradually becomes deeper to communicate the upper and lower surfaces, and an auxiliary diaphragm fixing member 22 located at the open end of the auxiliary diaphragm fixing member 22. an auxiliary diaphragm 20 that closes the through hole 16;
a first chamber 34 formed between the auxiliary diaphragm 20 and the cavity of the elastic body 4; a main diaphragm 32 attached to the lower surface of the auxiliary diaphragm fixing member 22; a second chamber 33 formed by the auxiliary diaphragm fixing member 22; and an auxiliary diaphragm tension adjustment mechanism 23 that can change the tension of the auxiliary diaphragm 20 by external operation; A liquid-filled mount characterized in that a liquid sealed inside the mount 33 flows through the orifice. (2) Tension adjustment mechanism 23 for the auxiliary diaphragm
is located inside the through hole 16 of the auxiliary diaphragm fixing member 22 and has an umbrella shape,
The upper surface of this umbrella-shaped portion has a boss 25 that comes into contact with the lower surface of the auxiliary diaphragm 20, and the tension of the auxiliary diaphragm 20 is changed by moving the boss 25 up and down via a gear mechanism that is rotated by external operation. A liquid-filled mount according to claim 1, which has been registered as a utility model. (3) The auxiliary diaphragm 20 has a base fabric located inside it.
Liquid-filled mount as described in section.