JP3599675B2 - Liquid filled type vibration damping device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid-filled type vibration damping device, in particular, a rotary type vibration device is provided in a passage communicating between a main chamber and a sub-chamber, and the vibration device is operated at a specific frequency. The present invention relates to a liquid-filled type vibration damping device that vibrates the liquid in the main chamber to reduce the dynamic spring constant with respect to vibration of a specific frequency.
[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. In order to cope with such a plurality of conditions, a so-called voice coil type in which a liquid chamber is provided inside, and a vibrator made of a voice coil or the like vibrating at a specific frequency is further provided in the liquid chamber. The liquid-filled type vibration damping device has already been devised, and is known, for example, from Japanese Patent Application Laid-Open No. 5-149369.
[0003]
[Problems to be solved by the invention]
By the way, these known ones require that a movable piece composed of a piston or the like be provided in the liquid chamber and a voice coil composed of an electromagnet or the like to drive the movable piece be provided. There is a problem that the device must be heavy. Also, in order to obtain a large driving force from the power source using the magnetic force based on the electromagnetic wave as the power source, it is necessary to enlarge the solenoid or to restrict the solenoid gap to a small size. There are various problems such as shaping or an increase in manufacturing cost. In order to solve such a problem, there has been proposed a liquid-filled type vibration damping device having a negative pressure driving type vibrating device that uses an engine suction negative pressure as a power source of driving means for driving a vibrator. And is already known (see JP-A-10-184775). However, in the above-mentioned conventional negative pressure drive type, in order to make the waveform of the force wave generated by the vibration device a normal sine wave, an extra thing such as a filter orifice or a side branch mechanism is provided. There is a need. As a result, there is a problem that the whole apparatus becomes complicated. In order to solve these problems, the present invention aims to provide a liquid-filled type vibration damping device having a swinging piston type vibration device driven by an electromagnetic rotary actuator having a simple structure. It is an object (problem) of the invention.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has taken the following measures.
[0005]
That is, according to the first aspect of the present invention, a first connecting member attached to the vibrating body side, a second connecting member attached to the vehicle body side member and the like, and the first connecting member and the second connecting member And a main chamber in which a part of the chamber wall is formed by a part of the insulator and in which a liquid that is an incompressible fluid is enclosed. A sub-chamber formed so that the liquid in the main chamber flows therein, and a part of the chamber wall is formed by a diaphragm; and a partition member for partitioning between the main chamber and the sub-chamber. A communication passage provided at the partition member and connecting the main chamber and the sub-chamber, a swing piston provided in the middle of the communication passage and the swing piston at a predetermined frequency. Electromagnetic low driven A vibrating device formed by a re-actuator, and a liquid-filled type vibration damping device, comprising: the swinging piston is connected to one of the main chamber side opening and the sub chamber side opening of the communication passage. A configuration is adopted in which the liquid is fixed to the periphery of the opening, and in this state, the liquid flows between the main chamber and the sub chamber via the communication path.
[0006]
By adopting such a configuration, in the case of the present invention, for a low frequency vibration input such as an engine idling vibration, a low dynamic spring constant is achieved by operating the oscillating piston in the communication path. With respect to the input of the engine shake, which is vibration at a lower frequency, the swing piston is connected to one of the main chamber side opening and the sub chamber side opening. At the peripheral portion, a predetermined opening area is secured and secured, and the main chamber and the sub-chamber are communicated through the opening, so that the opening and the communication passage are shaken. To serve as the orifice. As a result, high damping characteristics can be exhibited with respect to the vibration input of the engine shake.
[0007]
Next, the second aspect of the invention will be described. That is, in the present invention, with respect to the liquid-filled vibration damping device according to claim 1, wherein said the periphery of the opening of either side of the main chamber side opening or subchamber side opening of the communication passage A throttle passage communicating with the main chamber side or the sub-chamber side is provided, while the swing piston is provided around the opening on either one side of the communication passage and on the side where the throttle passage is provided. In this state, the liquid flows between the main chamber and the sub chamber via the throttle channel. By adopting such a configuration, in the case of the present invention, for a low frequency vibration input such as an engine idling vibration, a low dynamic spring constant is achieved by operating the oscillating piston in the communication path. And for the input of the engine shake, which is vibration at a lower frequency, fix the swinging piston at the opening on the side provided with the throttle flow path, As a result, the orifice for shake is formed by the throttle passage, so that a high damping force can be obtained for the engine shake. As a result, suppression (vibration suppression) of engine shake can be achieved.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. Although related to the present embodiment, as shown in FIG. 1, the configuration is such that a first connecting member 91 attached to the vibrating body side, a second connecting member 95 attached to a member or the like on the vehicle body side, A rubber-like insulator 8 that is provided between the connecting member 91 and the second connecting member 95 and blocks vibration from the vibrating body, and is provided in series with the insulator 8 and includes a non-compressible fluid (liquid ), A partition member 3 for partitioning between the main chamber 6 and the sub-chamber 7, and a part of the chamber wall of the sub-chamber 7, And a communication passage 35 connecting the main chamber 6 and the sub-chamber 7 with each other, and the liquid in the main chamber 6 is set to a specific frequency. Vibrating device 1 that vibrates by vibrating the vibrating device 1 A rotary actuator 2 that drives the swing piston 11 that is configured to basically in that it consists of.
[0009]
In such a configuration, the vibration device 1 is specifically provided at a communication path 35 connecting the main chamber 6 and the sub-chamber 7, and includes a rotary actuator described later. 2 and a swinging piston 11 provided in the radial direction of the rotating shaft 15 and having a fan-shaped cross section. is there. In the structure having such a configuration, the swing piston 11 is, when operated, in the communication passage 35 as shown in FIG. Although it is positioned so as to block the flow, in some cases, as shown by a two-dot chain line in FIG. 2, the liquid is passed through the communication passage 35 between the main chamber 6 and the sub chamber 7. It can also be positioned so that it can be freely distributed. That is, by fixing the swinging piston 11 at such a position, the communication passage 35 can also be used as a shake orifice.
[0010]
As shown in FIG. 1, a rotary actuator 2 for driving the vibration device 1 having such a configuration at a specific frequency has a cylindrical shape provided at one end of a rotating shaft 15 for driving the vibration device 1. A permanent magnet 21 and an electromagnet (coil) 22 provided around the permanent magnet 21 and configured to rotationally drive (oscillate) the permanent magnet 21 at a specific frequency. It is assumed that. In these places, a control action is further performed to supply a predetermined current to the electromagnet (coil) 22, and the stationary position (stop position) of the permanent magnet 21 is set to a specific position. Is provided.
[0011]
The control means 25 is composed of a microcomputer or the like mainly formed of a microprocessor unit (MPU). The rotary actuator 2 is driven by the control action of the control means 25. Is what it is. As a result, the swing piston 11 forming the vibration device 1 is driven at a specific frequency in the communication passage 35. By adopting these configurations, the liquid in the main chamber 6 connected to the communication path 35 is vibrated at a specific frequency.
[0012]
Next, an operation mode and the like of the present embodiment having such a configuration will be described. That is, in the embodiment, the vibration device 1 that vibrates the liquid in the main chamber 6 is provided in the communication path 35 that connects the main chamber 6 and the sub-chamber 7. In addition, the oscillating piston 11 forming the vibration device 1 is driven at a specific frequency by the rotary actuator 2. Therefore, for example, when the input vibration is the engine idling vibration, the rotary piston 2 of the vibration device 1 is operated by operating the rotary actuator 2 at a specific frequency by the operation of the control means 25. Finally, the liquid in the main chamber 6 is vibrated. Then, an increase in hydraulic pressure in the main chamber 6 due to engine idling vibration input through the insulator 8 is absorbed. As a result, the dynamic spring constant of the spring system formed by the vibration isolator decreases. As a result, the engine idling vibration is absorbed and cut off.
[0013]
In addition, for an engine shake that is a vibration having a lower frequency than the engine idling vibration, the vibration has a low frequency of about 10 Hz. It is difficult to achieve vibration isolation. Therefore, in the present embodiment, the vibration related to the engine shake is suppressed (attenuated) by improving the damping characteristics of the vibration damping device. Specifically, the rotary actuator 2 is fixed at a specific position based on the control action of the control means 25. Then, the swing piston 11 connected to the rotary shaft 15 of the rotary actuator 2 is fixed at the position shown by the two-dot chain line in FIG. Thus, the main chamber 6 and the sub chamber 7 are communicated via the communication passage 35. As a result, the liquid in the main chamber 6 flows toward the sub-chamber 7 via the communication passage 35 in response to engine shake vibration input via the insulator 8. Then, a predetermined damping force is generated by viscous resistance accompanying the flow of the liquid. With this damping force, suppression of engine shake is achieved.
[0014]
Next, other examples (modifications) of the above-described embodiment will be described with reference to FIGS. This is also basically the same as that described with reference to FIGS. The feature is that a so-called shake orifice is formed integrally with the communication passage 35. Specifically, for example, as shown in FIGS. 3 and 4, a throttle channel 355 for communicating between the communication passage 35 and the sub-chamber 7 is provided near the sub-chamber-side opening 357 of the communication passage 35. That is what we did. Then, as shown in FIG. 3, when the operation of the vibration device 1 is stopped and the distal end surface 111 of the swing piston 11 is fixed so as to close the sub-chamber-side opening 357, the throttle channel 355 The orifice serves as a shake orifice for flowing a liquid between the main chamber 6 and the sub chamber 7. When the vibration device 1 is operating and the swing piston 11 is operating at a predetermined frequency in the communication passage 35 as shown in FIG. This is to make little contribution to the formation of the dynamic spring constant.
[0015]
【The invention's effect】
According to the present invention, the first connecting member attached to the vibrating body side, 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, An insulator that blocks vibration from the vibrating body, a main chamber in which a part of the chamber wall is formed by a part of the insulator, and a liquid that is an incompressible fluid is enclosed, and the main chamber A sub-chamber, which is formed so that the liquid flows in and a part of the chamber wall is formed by the diaphragm, a partition member for partitioning between the main chamber and the sub-chamber, A vibrating device for vibrating the liquid at a specific frequency; and a liquid-filled type vibration damping device, comprising: a vibrating device that is a partition member that separates the vibrating device from the main chamber to the sub-chamber. Provided in the middle of the communication passage connecting the And an electromagnetic rotary actuator for driving the oscillating piston at a predetermined frequency. Thus, the input current to the electromagnetic rotary actuator is controlled. This makes it possible to easily generate a force wave (vibration wave) having a predetermined frequency and a desired generated force. As a result, various vibrations including high-order engine vibrations can be cut off and absorbed.
[0016]
In addition, a throttle flow path communicating with the main chamber side or the sub chamber side is provided in a periphery of one of the main chamber side opening and the sub chamber side opening of the communication path, and Wherein the swinging piston is fixed to an opening on one side of the communication passage and at a side where the throttle flow path is provided, so that the swinging piston does not swing. With respect to low-frequency vibration input such as engine idling vibration, a low dynamic spring constant can be achieved by operating the oscillating piston in the communication path, and further lower frequency can be achieved. The orifice for shaking is formed with the throttle passage by fixing the swinging piston at the opening on the side where the throttle passage is provided in response to the input of the engine shake which is vibration. Will be able to Rukoto, it has become possible is to obtain a high damping force with respect to engine shake. As a result, the engine shake can be suppressed (damped). Further, according to the present invention, it is possible to suppress the engine shake (vibration suppression) without separately providing an orifice dedicated to shake, thereby reducing the manufacturing cost of parts and the entire liquid-filled type vibration damping device. Has become possible.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the overall configuration of the present invention.
FIG. 2 is a partial cross-sectional view showing a configuration around a swing piston which forms a main part of the present invention.
FIG. 3 is a cross-sectional view according to another embodiment of the present invention, showing a relationship between a swing piston and a throttle passage provided in a communication passage when the vibration device is in an operation stop state. .
FIG. 4 is a plan view of a partition member, showing an overall configuration of a communication passage and a throttle passage according to another embodiment.
FIG. 5 is a cross-sectional view showing a relationship between a swing piston and a throttle passage provided in a communication passage when an exciting device is in an operating state according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vibration device 11 Oscillating piston 111 Tip surface 15 Rotation axis 2 Rotary actuator 21 Permanent magnet 22 Electromagnet (coil)
25 Control means 3 Partition member 35 Communication path 355 Restricted flow path 356 Main chamber side opening 357 Sub chamber opening 4 Diaphragm 6 Main chamber 7 Sub chamber 8 Insulator 91 First connecting member 95 Second connecting member

Claims (2)

A first connecting member attached to the vibrating body side, a second connecting member attached to a member or the like on the vehicle body side, and a vibration from the vibrating body between the first connecting member and the second connecting member. An insulator to be cut off, a main chamber in which a part of the chamber wall is formed by a part of the insulator, and a main chamber in which a liquid that is an incompressible fluid is sealed, and a liquid in the main chamber flows into the main chamber. a sub-chamber in which a part of the chamber wall is formed be one that is formed by diaphragm, and a partition member for partitioning between these main chamber and the auxiliary chamber, in which is provided at the said partition member a communication passage connecting between said main chamber and the auxiliary chamber there, formed by electromagnetic rotary actuator for driving the swing piston and the swing piston is provided in the middle of the communication passage at a predetermined frequency Exciter In the liquid-filled type vibration damping device, the swinging piston is fixed to a peripheral portion of one of the main chamber side opening and the sub chamber side opening of the communication passage. In a state, the liquid flows between the main chamber and the sub-chamber via the communication passage, and the liquid-filled vibration damping device is provided. 2. The liquid-filled type vibration damping device according to claim 1, wherein the main chamber side or the sub-chamber side is provided at a periphery of one of the main chamber-side opening and the sub-chamber-side opening of the communication passage. The throttle piston is fixed around the opening on either one side of the communication path and on the side where the throttle flow path is provided. A liquid-filled type vibration damping device characterized in that liquid flows between the main chamber and the sub-chamber through the throttle channel .

Images