JPH0680937U - Liquid-filled mount - Google Patents

Abstract

(57) [Abstract] [Purpose] To enhance damping of vibrations in the middle and high frequencies. [Structure] A center boss 5 is connected to a case 1 via a support spring 4, and a diaphragm 10 is provided in the case 1.
The partition wall 6 is provided, and the sub-liquid chamber 14 is formed between the partition wall 6 and the diaphragm 10, and the main liquid chamber 13 is formed between the partition wall 6 and the support spring 4. A communication hole 7 for communicating between the two liquid chambers 13 and 14 and an orifice 9 are bored in the partition wall 6, and a displacement member 11 made of a magnetic material is provided in the communication hole 7 so that the communication hole 7 can be opened and closed. The displacement member 11 is connected to the center boss 5 via the connection member 12, and the displacement member 1 is attached to the partition wall 6 at the peripheral portion of the communication hole 7.
An electromagnet 17 for magnetizing 1 is embedded. In the low frequency range, high damping is obtained due to the liquid column resonance of the orifice 9, and in the middle and high frequency ranges, the load generated by the driving of the displacement member 11 acts as a load having a phase opposite to that of the vibration input to the center boss 5. Dynamic spring constant decreases.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an anti-vibration device for isolating and supporting a vibration body such as an automobile engine, and more particularly to a liquid-filled mount in which a liquid is enclosed.

[0002]

[Prior art and its problems]

 Conventionally, various anti-vibration devices have been devised as anti-vibration support for vibration bodies such as automobile engines. For example, the anti-vibration device disclosed in Japanese Patent Laid-Open No. 62-288741 is already known. Has been.

That is, this anti-vibration device is a so-called active mount, and the pressure inside the liquid chamber is changed by driving an actuator located in the liquid chamber, so that the pulsation generated by the vibration from the engine is reversed in the liquid chamber. The pulsation of the phase is generated and the vibration from the engine is damped.

However, during use, the air contained in the rubber oozes into the liquid chamber, the air contained in the liquid oozes out into the liquid chamber, and the air leaks from the sealing portion with the outside. When it enters the chamber, the change in pressure inside the liquid chamber becomes small, and the anti-vibration effect deteriorates. Especially when vibration in the high frequency range is input, the air mixed in the liquid chamber is only compressed, and even if the actuator is driven, the liquid pressure in the liquid chamber can hardly be changed. there were.

The present invention solves the above-mentioned problems of the conventional one, and provides a liquid-filled mount capable of obtaining a sufficient vibration damping effect even when air is mixed in the liquid chamber. The purpose is to do.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention is to connect a center boss to a case through a support spring and to provide a diaphragm and a partition in the case so that the partition and the partition are provided. A sub-liquid chamber containing liquid is formed between the diaphragm and a main liquid chamber containing liquid between the partition wall and the support spring, and a communication hole for communicating between the two liquid chambers is formed in the partition wall. In addition to providing an orifice, a displacement member that can open and close the communication hole is provided in the communication hole, the displacement member is connected to the center boss via a connecting member, and a driving member that can drive the displacement member is provided. The means provided on the partition wall is adopted.

[0007]

[Action]

 This invention adopts the above-mentioned means, and when the vibration in the low frequency range is input, the case and the partition wall are integrally displaced, and the partition wall is brought into contact with the displacement member to close the communication hole of the partition wall. , The internal pressure of the main liquid chamber rises, the liquid in the main liquid chamber moves to the sub liquid chamber via the orifice, and the liquid in the sub liquid chamber moves to the main liquid chamber via the orifice by the action of the diaphragm. In this way, the liquid column resonance when the liquids move between the main and sub liquid chambers via the orifice causes the vibrations in this frequency range to be attenuated.

On the other hand, when vibrations in the middle / high frequency range are input, the case and the partition wall are integrally displaced, and the partition wall comes into contact with the displacement member to close the communication hole of the partition wall, thereby increasing the internal pressure of the main liquid chamber. In this frequency range, since the liquid column inertia in the orifice becomes large, the liquid does not move between the main and sub liquid chambers via the orifice, and the load and support generated by the increase in the internal pressure of the main liquid chamber The load generated by the compression deformation of the spring is transmitted to the center boss side. Here, when the drive member is operated, the displacement member in the partition wall is driven against the connecting member, and thereby a load that balances the load due to vibration can be generated in the center boss. Therefore, the entire dynamic spring can be set to a value close to 0, and the vibration in this frequency range can be effectively damped.

[0009]

Embodiments Embodiments of the present invention shown in the drawings will be described below. FIG. 1 shows an embodiment of a liquid-filled mount according to the present invention. The liquid-filled mount is a cylindrical case with one end closed to be connected to the engine 15 side which is a vibrating body. 1, a substantially cylindrical support spring 4 made of an elastic body, one end of which is connected to the other end opening of the case 1, and the other end of the support spring 4, and the side of the vehicle body 16 which is a support. A truncated cone-shaped center boss 5 that is connected to the case 1, a substantially disk-shaped partition wall 6 that is provided in the case 1 and divides the case 1 into two chambers, and an upper surface side of the partition wall 6 in the case 1. A thin bowl-shaped diaphragm 10 made of an elastic body that is displaceable to the center boss 5 and a magnetic member that is displaceably provided in the partition wall 6 and is connected to the center boss 5 via a connecting member 12 made of an elastic body. A plate-shaped displacement member 11 made of a material A main liquid chamber 13 containing a liquid is formed between the partition wall 6 and the support spring 4, and a sub liquid chamber 14 containing a liquid is formed between the partition wall 6 and the diaphragm 10. There is.

The case 1 includes a main body 2 having a cylindrical shape, and a bowl-shaped lid 3 which is attached to the opening at one end of the main body 2 by caulking the peripheral edge and closes the lid. A threaded portion 3a for attaching to the engine 15 side is provided in the central portion on the upper surface side of the portion 3.

Further, the outer peripheral surface side of the partition wall 6 is fitted to the inner surface side of the main body portion 2, and the upper surface side peripheral edge portion of the partition wall 6 and the lower surface side peripheral edge portion of the lid portion 3 are joined together. The peripheral edge of the diaphragm 10 is clamped and fixed between them, and the opening at the other end of the main body 2 projects radially outwardly in an annular shape and projects from it. One end of the support spring 4 is connected to the portion.

The support spring 4 is formed such that one end has a larger diameter than the other end and the thickness gradually increases from one end to the other end, and the other end side is the upper surface side of the center boss 5. It is designed to be connected to.

A communication hole 7 is formed at the center of the partition wall 6 so as to penetrate from the upper surface side to the lower surface side, and the communication hole 7 is recessed radially outward at the center in the longitudinal direction. An annular recess 8 is bored, and the displacement member 11 having a diameter larger than that of the communication hole 7 is vertically displaceable in the recess 8 and the communication hole 7 can be opened and closed. The center boss 5 is connected to the upper surface side of the center boss 5 through the connecting member 12.

Further, an electromagnet 17 which is a driving member connected to an external control device 18 via a lead wire or the like is attached to a partition wall 6 at a portion facing the peripheral portion of the communication hole 7 with the depression 8 interposed therebetween. The displacement member 11 is magnetized by energizing the electromagnet 17 so that it can be vertically driven against the spring force of the connecting member 12.

Further, an orifice 9 having an appropriate area and length that communicates from the upper surface side to the lower surface side of the partition wall 6 is bored in a portion of the partition wall 6 on the outer side in the radial direction of the recessed portion 8, and this orifice is formed. The auxiliary liquid chamber 14 on the upper surface side of the partition wall 6 and the main liquid chamber 13 on the lower surface side of the partition wall 6 communicate with each other via the spacer 9.

Next, the operation of the above will be described. The lid portion 3 of the case 1 of the liquid-filled mount configured as described above is connected to the engine 15 side through the screw portion 3a on the upper surface side thereof, and the center boss 5 is connected to the body 16 side through screws (not shown) or the like. When connected and the engine 15 is operated, the vibration from the engine 15 is input to the case 1.

When the vibration from the engine 15 is vibration in a low frequency range (shock vibration or the like), the vibration causes the case 1 and the partition wall 6 to be integrally displaced to a large extent downward in the figure, and the case 1 The support spring 4 interposed between the center boss 5 and the center boss 5 is subjected to compressive deformation, and the partition wall 6 is brought into contact with the upper surface side of the displacement member 11 by the downward displacement of the partition wall 6 in the figure, thereby communicating the partition wall 6 The hole 7 is closed. Then, by closing the communication hole 7, the internal pressure of the main liquid chamber 13 rises, the liquid in the main liquid chamber 13 moves to the side of the sub liquid chamber 14 via the orifice 9 of the partition wall 6, and the sub liquid The liquid in the chamber 14 moves to the main liquid chamber 13 side through the orifice 9 by the action of the diaphragm 10. In this way, the liquid column resonance action when the liquids move between the main and sub liquid chambers 13 and 14 via the orifice 9 causes the vibration in this frequency range to be attenuated.

Next, when the vibrations from the engine 15 are vibrations in the middle and high frequency ranges (idle vibrations, etc.), the vibrations cause the case 1 and the partition wall 6 to integrally move downward in the figure, The support spring 4 interposed between the case 1 and the center boss 5 receives the compressive deformation, and the partition 6 comes into contact with the upper surface side of the displacement member 11 by the downward displacement of the partition 6 in the figure, and the partition 6 The communication hole of is closed. Then, as the communication hole 7 is closed, the internal pressure of the main liquid chamber 13 rises. However, in this frequency range, since the liquid column inertia in the orifice 9 becomes large, the liquid did not move between the main and auxiliary liquid chambers 13 and 14 via the orifice 9, and the liquid stopped. In this state, the load generated by the compressing deformation of the support bar 4 and the load generated by the increase of the internal pressure of the main liquid chamber 13 try to be transmitted to the center boss 5 side.

Here, when the control device 18 is operated to energize the electromagnet 17 of the partition wall 6, the displacement member 11 located in the recessed portion 8 of the partition wall 6 is magnetized, and the displacement member 11 is connected to the connecting member 12. By driving the displacement member 11 in the vertical direction in the figure against the spring force, the center boss 5 can be loaded in the upward direction in the figure.

Then, the load by the displacement member 11 is adjusted to have the same magnitude and opposite direction to the load to be transmitted to the center boss 5 side by vibration, so that the dynamic spring of the mount as a whole is substantially adjusted. Since it can be set to a value close to 0, the vibration in this frequency range can be effectively damped.

Therefore, the air contained in the liquid exudes into the both liquid chambers 13 and 14, the air enters the both liquid chambers 13 and 14 from the sealing portion with the outside, and is contained in the rubber. Even if the air that oozes out into both liquid chambers 13 and 14, a sufficient load can be applied to the center boss 5 to damp the vibration, so it is stable against vibration in this frequency range for a long time. Damping property is obtained.

The load generated on the center boss 5 when the displacement member 11 is driven can be set to an appropriate value by adjusting the current value, frequency, phase, etc. to the electromagnet 17. By setting this value to a desired value, it is possible to effectively damp vibrations of a desired frequency in the middle / high frequency range.

In the above description, the driving member 17 is made of an electromagnet and the displacement member 11 is made of a plate made of a magnetic material. However, the present invention is not limited to this, and other combinations are possible. However, the point is that the drive member is configured so that the displacement member can be driven.

[0024]

[Effect of device]

 With this configuration, the invention utilizes the resonance action of the liquid column of the orifice when the liquids move between the main and sub liquid chambers via the orifice for vibrations in the low frequency range. By doing so, high attenuation can be obtained. Also, for vibrations in the middle and high frequencies, the liquid column inertia of the orifice becomes large, so the liquid does not move between the main and sub liquid chambers via the orifice, and the support spring is compressed. The load generated by the main liquid chamber and the load generated by increasing the internal pressure of the main liquid chamber try to transmit to the center boss side. Here, when the drive member of the partition wall is operated to drive the displacement member, the displacement member is driven against the spring force of the connecting member, and the load generated by the drive of the displacement member to the center boss is generated. To work. Then, by adjusting the load by this displacement member so that the load is the same as the load applied to the center boss due to the vibration and the direction is opposite, it is possible to make the overall dynamic spring close to 0. it can. Therefore, it has an excellent effect that vibrations in this frequency range can be effectively damped.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a liquid-filled mount according to the present invention.

[Explanation of reference numerals] 1 ... Case 2 ... Main body 3 ... Lid 3a ... Screw 4 ... Support spring 5 ... Center boss 6 ... Partition 7 ... Communication hole 8 ... Recess 9 ... ... Orifice 10 ... Diaphragm 11 ... Displacement member 12 ... Connection member 13 ... Main liquid chamber 14 ... Sub liquid chamber 15 ... Engine 16 ... Body 17 ... Drive member (electromagnet) 18 ... Control device

Claims (1)

[Scope of utility model registration request] 1. A center boss (5) is connected to a case (1) via a support spring (4), and the case (1) is also connected.
A diaphragm (10) and a partition (6) are provided inside, and a sub-liquid chamber (14) in which a liquid is sealed between the partition (6) and the diaphragm (10) is provided with the partition (6) and a support spring (4). A main liquid chamber (13) in which a liquid is sealed is formed between the two liquid chambers (13) and (14), and a communication hole (7) and an orifice (9) for communicating between the two liquid chambers (13) and (14) in the partition wall (6). And a displacement member (11) capable of opening and closing the communication hole (7) is provided in the communication hole (7), and the displacement member (11) is connected to the center boss (5) via a connecting member (12). And a drive member (17) capable of driving the displacement member (11) is provided on the partition wall (6).