JP2004028294A - Liquid sealing type vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cut off the engine idling vibration having a frequency close to the natural frequency of the engine shake vibration. <P>SOLUTION: This liquid sealing type vibration control device is provided with a rubber insulator 4 provided between a first connector member 91 to be fitted to a vibrator and a second connector member 95 to be fitted to a car body side member to absorb and cut the vibration from the vibrator, a main chamber 5, of which chamber wall is formed by a part of the insulator 4 and which is filled with the liquid, an auxiliary chamber 6 connected to the main chamber 5 through an orifice 3 and of which chamber wall is formed by a diaphragm 7 at a part thereof, and a switching mechanism working as a partition for partitioning between the main chamber 5 and the auxiliary chamber 6 and having a switching function for supporting the partition part in the nearly rigid condition or in the soft condition at a part thereof. The switching mechanism 1 is formed of an electromagnet 11 provided at a central part and a MR fluid chamber 121 provided outside of the electromagnet 11 and sealed with the MR fluid 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid-filled type vibration damping device having a vibration damping mechanism formed so as to cut off vibrations in a specific frequency range, and in particular, for example, two frequencies such as engine idling vibration and engine shake vibration. TECHNICAL FIELD The present invention relates to a liquid-filled type vibration damping device for blocking vibration of a liquid.
[0002]
[Prior art]
Among the vibration isolators, especially in the case of engine mounts for automobiles, the engine, which is the power source, is used under various conditions from the idling operation state to the maximum rotation speed. Therefore, it must be able to handle a wide range of frequencies. Therefore, two liquid chambers are provided inside and connected between them by an orifice, and the liquid in the orifice is resonated at a specific frequency so as to cut off vibration at a specific frequency. An apparatus has been devised and is already known, for example, from Japanese Patent Application Laid-Open No. 2001-20992.
[0003]
[Problems to be solved by the invention]
By the way, the above-mentioned conventional one reduces the dynamic spring constant of the whole vibration isolator by the liquid column resonance action of the liquid present in one orifice, thereby cutting off the idling vibration, With respect to engine shake vibration which is a problem during traveling, a damping force based on the flow resistance of the liquid in the other orifice exerts a vibration damping function. However, in recent automobile engines, a lean burn system or the like is adopted from the viewpoint of low fuel consumption, and the idling operation state of the engine is placed in an unstable state, and the engine idling frequency is also reduced. (Low frequency). For this reason, as in the conventional case, two orifices are provided, and one orifice is subjected to liquid column resonance with respect to the input of idling vibration to reduce the dynamic spring constant, thereby shutting off engine idling vibration. Attempting to suppress engine shake vibration with the damping force generated by the orifice on the other side has a limit because the two frequency ranges are close to each other. In order to cut off such low frequency idling vibration and to suppress engine shake vibration, a measure is taken by providing an object having a variable damping characteristic around a partition that separates the main chamber from the sub chamber. It is an object (problem) of the present invention to provide a liquid filled type vibration damping device having a switching mechanism as described above.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has taken the following measures. That is, according to the first aspect of the present invention, a first connecting member attached to the vibrating body, a second connecting member attached to a member or the like on the vehicle body side, the first connecting member and the second connecting member A rubber-like insulator that absorbs and blocks vibration from the vibrating body, a main chamber in which a chamber wall is formed by a part of the insulator, and a liquid is sealed, A liquid-filled vibration isolator comprising: a sub-chamber connected to the chamber via an orifice and part of the chamber wall being defined by a diaphragm; and a partition section for partitioning between the main chamber and the sub-chamber. With respect to the above, a configuration is provided in which a switching mechanism including an electromagnet provided at the center thereof and an MR fluid chamber provided around the electromagnet and filled with an MR fluid is provided at the partition. Take It was and.
[0005]
By adopting such a configuration, according to the present invention, it is possible to cut off engine idling vibration and cut off engine shake vibration, which is a problem during running of the vehicle, by operating the switching mechanism. Become like In particular, in the case of the present invention, when the engine idling frequency is lower than that of the conventional one, for example, when the engine idling frequency has a value of about 15 Hz, the switching mechanism is actuated to cause the MR fluid to operate. The magnet fluid is magnetized to maintain the MR fluid in a high viscosity state, so that engine idling vibration can be suppressed even in the MR fluid chamber. As a result, according to the present invention, low frequency (low frequency) engine idling vibration can be effectively damped.
[0006]
Next, the second aspect of the invention will be described. This is also basically the same as the first aspect. That is, in the present invention, with respect to the liquid-filled type vibration damping device according to the first aspect, when the engine is idling, the electromagnet is energized to increase the viscosity of the MR fluid. In addition to supporting the partition including the Bingham object having a high plastic viscosity, the MR fluid is maintained in a low viscosity state without magnetizing the MR fluid while the vehicle is running, and the entire partition is flexibly formed. It was decided to adopt a configuration in which the state was maintained. By adopting such a configuration, in the present invention as well, it is possible to cut off engine idling vibration and cut off engine shake vibration during running of the vehicle, as in the first aspect. In particular, according to the present invention, in order to shut off the engine shake vibration which is a problem during the running of the vehicle, the electromagnet forming the switching mechanism is not energized. Since no electric power is required, it is possible to reduce the amount of electric power consumed during traveling of the vehicle, and further to reduce the total amount of energy consumed during traveling of the vehicle.
[0007]
Next, a third aspect of the present invention will be described. This is also basically the same as the first or second aspect. That is, in the present invention, in the liquid-filled type vibration damping device according to claim 1 or 2, the configuration of the orifice is set so that the liquid in the orifice performs a liquid column resonance operation when engine idling vibration is input. I decided to set it.
[0008]
By adopting such a configuration, in the case of the present invention as well, it is possible to cut off the engine idling vibration and the engine shake vibration in the same manner as in the first or second aspect. In particular, in the case of the present invention, the orifice, including its diameter and length, is subjected to the orifice with respect to a vibration input of about 15 Hz which is a low frequency engine idling vibration as compared with the conventional one. The liquid in the liquid-filled vibration damping device is set so that the liquid in the liquid-filled vibration-damping device has a liquid column resonance effect. Will be able to As a result, engine idling vibration can be effectively cut off. It should be noted that engine shake vibration, which is a problem during traveling of the vehicle, can be suppressed (damped) by the action of damping force based on the flow action of the liquid in the orifice.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. Although it relates to the present embodiment, as shown in FIG. 1, the configuration includes a first connecting member 91 attached to a vibrating body, a second connecting member 95 attached to a member on the vehicle body side, and the like. A rubber-like insulator 4 between the connecting member 91 and the second connecting member 95 for absorbing and blocking vibration from the vibrating body, and a chamber wall formed by a part of the insulator 4. A main chamber 5 in which a liquid is sealed, a sub chamber 6 connected to the main chamber 5 through the orifice 3 and a part of a chamber wall defined by a diaphragm 7; A switch serving as a partition for partitioning the chamber 6 from the chamber 6, for example, whether the partition is held by a high-viscosity object or a low-viscosity object. A switching mechanism 1 that performs a function; A control unit 2 for switching control of the conversion mechanism 1 is configured to basically in that it consists of.
[0010]
In the one having such a basic configuration, the orifice 3 has an annular shape in plan view as shown in FIG. 1, and the orifice 3 has a double spiral orifice forming member. 31 is formed. A switching mechanism 1 is provided at the center of the annular orifice forming member 31, and the switching mechanism 1 and the orifice forming member 31 partition the main chamber 5 and the sub chamber 6. A part is formed. In the structure having such a configuration, the orifice forming member 31 is formed of a predetermined plastic material or an aluminum alloy material or the like. It has a spiral shape. The main chamber 5 has a main chamber-side opening 35 and the sub-chamber 6 has a sub-chamber opening 36 so that the main chamber 5 and the sub-chamber 6 communicate with each other. That is what you are going to do.
[0011]
Next, the switching mechanism 1 provided integrally with the orifice forming member 31 at the center of the annular orifice forming member 31 having such a configuration will be described. As shown in FIG. 2, the electromagnet 11 is provided in the center and has an annular shape and is formed by a coil, and the electromagnet 11 which holds the electromagnet 11 is made of a magnetic metal. A bobbin 111 formed by holding the bobbin 111 from above and below and holding the bobbin 111 from above and below, and a ring-shaped case 15 outside the case 15; An outer shape is formed by the flexible cover rubber 125, and an MR fluid chamber 121 in which the MR fluid 12 is sealed is formed into a ring-like shape. The yoke 13 is basically fixed to the annular orifice forming member 31 and has an inner diameter side protruding into the MR fluid chamber 121. That.
[0012]
In such a configuration, the inner diameter of the yoke 13 is set to be smaller than the outer diameter of the disk-shaped case 15 provided above and below the yoke 13. Therefore, as shown in FIG. 2, a labyrinth is formed in the longitudinal section of the MR fluid chamber 121 in which these members 13 and 15 are installed. The fluid flows in the MR fluid chamber 121. The outer diameter of the case 15 and the inner diameter of the yoke 13 are overlapped with each other. When the MR fluid 12 has fluidity, the respective parts 13 and 15 are switched by the switching mechanism 1. This serves as a stopper for restricting the vertical movement of the head. The disc-shaped case 15 for holding the electromagnet 11 via the bobbin 111 is composed of two upper and lower cases. And the whole is fixed. Then, in such a state, one end of the cover rubber 125 is connected to the outer diameter portion in a liquid-tight manner. Therefore, an MR fluid chamber 121 is formed by the cover rubber 125 on the outer diameter side of the disc-shaped case 15.
[0013]
Then, a part of the cover rubber 125 is attached to the inner diameter side of the annular orifice forming member 31, and the switching mechanism 1 is installed between the main chamber 5 and the sub chamber 6. Is what it is. Thus, the switching mechanism 1 also functions as a partition that partitions between the main chamber 5 and the sub-chamber 6. Further, in such a configuration, a lead wire 112 is attached to the electromagnet 11, and one end thereof is connected to a predetermined control means 2. Therefore, the electromagnet 11 is controlled to be in an energized state or a non-energized state by the command from the control means 2.
[0014]
Next, an operation mode and the like of the embodiment will be described. First, the case of inputting the engine idling vibration will be described. In the present embodiment, the engine idling vibration has a lower frequency of about 15 Hz than that of the conventional engine. Therefore, in the present embodiment, the input of the engine idling vibration is dealt with by operating the switching mechanism 1. Specifically, in FIG. 1, the electromagnet 11 is turned on based on a command (signal) from the control unit 2. Thereby, the MR fluid 12 is magnetized, and the viscosity of the MR fluid 12 increases. As a result, the MR fluid chamber 121 in which the MR fluid exists is in a state in which a Bingham object having a high plastic viscosity exists. Therefore, the switching mechanism 1 connected to the orifice forming member 31 via the MR fluid chamber 121 is in a state of being supported by the Bingham object. The vibration transmitted to the liquid existing in the main chamber 5 is transmitted to the fluid in the orifice 3. By the way, in the present embodiment, the specifications (specifications) of the orifice 3 are set so that the liquid in the orifice 3 performs liquid column resonance with respect to the vibration input of 15 Hz. Therefore, the dynamic spring constant formed by the present liquid-filled type vibration damping device is reduced with respect to the input of the engine idling vibration of about 15 Hz. When the MR fluid chamber is in the state where the Bingham object is present, the idling vibration transmitted to the liquid in the main chamber 5 is also damped at the MR fluid chamber 121. . Specifically, the engine idling vibration at about 15 Hz is suppressed (damped) by the damping force of the MR fluid in the form of a Bingham object having a high plastic viscosity. As a result, the engine idling vibration is effectively damped.
[0015]
On the other hand, in response to input of engine shake vibration, which is a problem during running of the vehicle, the power supply to the electromagnet 11 is stopped so that the electromagnet 11 is de-energized, and the liquid in the main chamber 5 is made It is made to flow to the chamber 6 side. The damping force is exerted on the basis of the flow resistance due to the liquid flow in the orifice 3. By the action of this damping force, engine shake vibration of about 10 Hz is suppressed. That is, suppression (vibration suppression) of engine shake vibration is performed.
[0016]
As described above, according to the present embodiment, the engine idling frequency has a very low value, and in a state close to the engine shake frequency, the switching mechanism 1 is used only when the engine idling vibration is input. , And a low dynamic spring constant is attained by the liquid column resonance action of the orifice 3, thereby suppressing or cutting off engine idling vibration. On the other hand, with respect to the input of engine shake vibration which is a problem during running of the vehicle, the vibration is damped by the damping force of the orifice 3 without supplying power to the electromagnet 11 in particular. Power consumption for operating the device can be minimized. That is, it is possible to effectively cut off engine idling vibration and suppress engine shake vibration while reducing consumption of the vehicle-mounted battery.
[0017]
【The invention's effect】
According to the present invention, the first connecting member attached to the vibrating body, the second connecting member attached to a member or the like on the vehicle body side, and between the first connecting member and the second connecting member, A rubber-like insulator that absorbs and blocks vibration from the vibrating body, a main chamber in which a chamber wall is formed by a part of the insulator, and in which a liquid is sealed, and an orifice connected to the main chamber through an orifice A liquid-filled vibration isolator, comprising: a sub-chamber in which a part of a chamber wall is defined by a diaphragm and a partition that partitions between the main chamber and the sub-chamber. However, a switching mechanism including an electromagnet provided at the center thereof and an MR fluid chamber provided around the electromagnet and filled with an MR fluid is adopted. So the engine And blocking of the engine shake vibration which is blocked and the problem while the vehicle is traveling in Idoringu vibration, it can now be done efficiently by appropriately operating the switching mechanism. In particular, in the case of the present invention, when the engine idling frequency is a lower value than the conventional one, for example, it has a value of about 15 Hz, and when there is not much difference from the engine shake frequency, By operating the switching mechanism to magnetize the MR fluid and thereby keep the MR fluid in a high viscosity state, low frequency (low frequency) engine idling vibration can be effectively damped. It became so.
[0018]
Further, in the present invention, when the engine is idling, the electromagnet is energized to magnetize the MR fluid, whereby the MR fluid is maintained in a high viscosity state and the partition portion is formed of a Bingham object. While the vehicle is running, the MR fluid is not magnetized during the running of the vehicle, and the MR fluid is maintained in a low viscosity state. And the total amount of energy consumed during running of the vehicle can be reduced, and in such a state, the engine shake vibration can be attenuated by the operation of the orifice. Became.
[0019]
Further, in the present invention, the configuration of the orifice is set such that the liquid in the orifice performs a liquid column resonance action when engine idling vibration is input. The liquid in the orifice resonates with the liquid column in response to the input of the vibration of about 15 Hz, which is the idling vibration, whereby the spring constant of the entire liquid-filled type vibration damping device can be reduced. As a result, engine idling vibration can be effectively cut off.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the overall configuration of the present invention.
FIG. 2 is a longitudinal sectional view showing an entire configuration of a switching mechanism which is a main part of the present invention.
[Explanation of symbols]
Reference Signs List 1 switching mechanism 11 electromagnet 111 bobbin 112 lead wire 12 MR fluid 121 MR fluid chamber 125 cover rubber 13 yoke 15 case 19 fastening bolt 2 control means 3 orifice 31 orifice forming member 35 main chamber side opening hole 36 sub chamber side opening hole 5 main Chamber 6 Subchamber 7 Diaphragm 91 First connecting member 95 Second connecting member

Claims (3)

A first connecting member attached to the vibrating body, a second connecting member attached to the member on the vehicle body side, and absorbing vibration from the vibrating body between the first connecting member and the second connecting member. And a rubber-like insulator for shutting off, a main chamber in which a chamber wall is formed by a part of the insulator, the main chamber in which liquid is sealed, and a diaphragm connected to the main chamber via an orifice. In a liquid-filled type vibration isolator comprising a sub-chamber in which a part of the chamber wall is formed and a partition for partitioning between the main chamber and the sub-chamber, a central portion is provided at the partition. And a switching mechanism including an MR fluid chamber, which is provided around the electromagnet, and is filled with an MR fluid, which is a fluid provided around the electromagnet and whose viscosity changes according to the strength of the magnetic field. Features Liquid-filled vibration damping device for. 2. The liquid filled type vibration damping device according to claim 1, wherein, when the engine is idling, the electromagnet is energized so as to maintain the viscosity of the MR fluid at a high level, and the MR fluid is run while the vehicle is running. A liquid-filled type vibration damping device characterized in that the MR fluid is kept in a low viscosity state without magnetizing the fluid. 3. The liquid-filled type vibration damping device according to claim 1, wherein the configuration of the orifice is set such that the liquid in the orifice performs a liquid column resonance operation when engine idling vibration is input. Characteristic liquid-filled vibration damping device.

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