JPH04277339A - Control for vibrationproof device - Google Patents

Abstract

PURPOSE:To prevent abnormal noise from being made due to the collision of the movable body of a vibrationproof device and a partitioning member, at the start and stop of an engine. CONSTITUTION:The liquid chamber 32 of a vibrationproof device 10 is charged with the electric viscous fluid. A movable plate 50 is freely fitted by forming a movable plate fitting groove 44 having a U-figure shaped section on the inner peripheral surface of a partitioning plate 34 for partitioning a main liquid chamber 32A and a subliquid chamber 32B. Electrodes 46 and 48 are installed on the upper and undersurfaces of the movable plated fitting groove 44, and connected with a controller 51. With the controller 51, an ignition switch 52, engine revolution speed detecting sensor 53, car speed detecting sensor 54, and a starter 55 are connected, and the operation state of the engine is judged. When the engine is started or stopped, voltage is applied to the electrodes 46 and 48 by the controller 51, and the electric viscous fluid on the periphery of the movable plate 50 is solidified. Accordingly, the shift of the movable plate 50 is suppressed, and the generation of the abnormal noise due to the collision of the movable plate 50 and the partitioning body 34 is prevented.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a vibration isolating device for an engine, in which a plurality of small liquid chambers are provided between a vibration generating part and a vibration receiving part, and the flow of liquid moving between these small liquid chambers is controlled. The present invention relates to a method of controlling a vibration isolator that absorbs vibrations using resistance.

0002

[Prior Art] As a vibration isolator used in automobile engine mounts, cab mounts, body mounts, etc.
Some liquid chambers are provided with a liquid chamber partially made of an elastic material (Japanese Unexamined Patent Publication No. 113835/1983, etc.). This liquid chamber is divided into a plurality of small liquid chambers by a partition member, and these small liquid chambers are communicated with each other through a restriction passage. Therefore, when vibration occurs, the vibration is damped by the resistance when the liquid in one small liquid chamber moves toward the other small liquid chamber through the restriction passage.

In addition, in this vibration isolator, when high frequency vibrations occur that cause the restriction passage to become clogged, the movable body provided on the partition member moves slightly in the direction of expanding and contracting the small liquid chamber, thereby causing the inside of the liquid chamber to become smaller. It limits pressure rise and absorbs high-frequency vibrations such as muffled sounds.

However, with this vibration isolator, when low frequency, large amplitude vibrations (so-called cranking vibrations) are applied due to torque fluctuations when starting the engine, the movable body collides with the partition member due to a sudden pressure change in the liquid chamber. There is a problem with abnormal noises. In addition, when the engine stops rotating (until the engine speed drops from idling speed to 0), low-frequency, large-amplitude vibrations occur due to engine torque fluctuations, so even at this time, there are sudden sudden vibrations in the liquid chamber. Due to pressure changes, the movable body collides with the partition member and generates abnormal noise.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned facts, the present invention provides a vibration isolating device that can prevent the occurrence of abnormal noise due to collision between a movable body and a partition member when starting and stopping an engine. The purpose is to provide a control method for

[0006]

[Means for solving the problem] The invention according to claim 1 includes:
A liquid chamber provided between the vibration generating part and the vibration receiving part and divided into a plurality of small liquid chambers by a partition member, a restriction passage communicating these small liquid chambers, and a liquid chamber filled with and applied to the liquid chamber. An electrorheological fluid whose viscosity changes depending on the size of the electric field,
a movable body disposed between the small liquid chambers and supported so as to be able to move minutely relative to the partition member; and a movable body disposed to sandwich the movable body for supplying current to the electrorheological fluid A method for controlling energization to an electrode for a movable body that controls the viscosity of the electrorheological fluid in a vibration isolating device having an electrode, the method comprising: It is characterized by applying a voltage to the electrodes.

The invention according to claim 2 provides a liquid chamber provided between the vibration generating part and the vibration receiving part and partitioned into a plurality of small liquid chambers by a partition member, and a restriction passage communicating with these small liquid chambers. an electrorheological fluid filled in the liquid chamber and whose viscosity changes depending on the magnitude of an applied electric field; an electrode for the restricting passage provided in the restricting passage for supplying current to the electrorheological fluid; A movable body disposed between the small liquid chambers and supported so as to be minutely movable with respect to the partition member, and an electrode for the movable body provided to sandwich the movable body and for energizing the electrorheological fluid. A method for controlling energization to the electrode for the restricted passage and the electrode for the movable body for controlling the viscosity of the electrorheological fluid in a vibration isolator having the following: applying a voltage to the electrode for the restricted passage and the electrode for the movable body;
When the vibration of the vibration generating section is shake vibration, a voltage is applied to the electrode for the limited passage and the electrode for the movable body, and when the vibration of the vibration generating section is idle vibration, a voltage is applied to the electrode for the limited passage. The present invention is characterized in that a voltage is applied to the electrode for the movable body, and no voltage is applied to the electrode for the restricted passage and the electrode for the movable body when the vibration of the vibration generating section is a high-frequency vibration.

[0008]

[Operation] In the invention as claimed in claim 1, when the frequency of vibration is low, the vibration is attenuated by the passage resistance of the electrorheological fluid moving through the restricted passage communicating between the small liquid chambers and the liquid column resonance. Ru. When the frequency of vibration becomes high, the restriction passage becomes clogged, but the small movement of the movable body due to the vibration suppresses the pressure rise in the liquid chamber and provides a low dynamic spring constant.

Furthermore, when starting or stopping the engine, a voltage is applied to the electrode for the movable body to increase the viscosity of the electrorheological fluid around the movable body, thereby fixing the movable body and making it movable. Prevent body movement. Therefore, even if engine torque fluctuations when starting or stopping the engine act on the vibration isolator and cause a sudden pressure change in the liquid in the liquid chamber, the movable body and the partition member will not collide. Therefore, no abnormal noise is generated.

In the invention as claimed in claim 2, when the frequency of vibration is low, the vibration is attenuated by passage resistance of the electrorheological fluid moving through the restricted passage communicating between the small liquid chambers or liquid column resonance. Ru. When the frequency of vibration becomes high, the restriction passage becomes clogged, but the small movement of the movable body due to the vibration suppresses the pressure rise in the liquid chamber and provides a low dynamic spring constant.

When starting or stopping the engine, a voltage is applied to the electrode for the movable body to increase the viscosity of the electrorheological fluid around the movable body, thereby fixing the movable body. prevent the movement of Therefore, even if engine torque fluctuations when starting or stopping the engine act on the vibration isolator and cause a sudden pressure change in the liquid in the liquid chamber, the movable body and the partition member will not collide. Therefore, no abnormal noise is generated. Further, a predetermined voltage is applied to the electrode for the restricted passage to increase the viscosity of the electrorheological fluid in the restricted passage. Therefore, the passage resistance of the electrorheological fluid moving through the restricted passage becomes large. Therefore, a high damping force can be obtained due to the large passage resistance of the electrorheological fluid moving through the restricted passage, and low frequency vibrations when starting and stopping the engine are effectively absorbed.

[0012] When the vibration of the vibration generating section is shake vibration, a voltage is applied to the electrode for the restricted passage and the electrode for the movable body. At this time, the movable body is fixed by increasing the voltage applied to the electrode for the movable body to increase the viscosity of the electrorheological fluid around the movable body. by this,
The electrorheological fluid flows between the fluid chambers only through the restricted passageway. Further, a predetermined voltage is applied to the electrode for the restricted passage to increase the viscosity of the electrorheological fluid in the restricted passage. Therefore, the passage resistance of the electrorheological fluid moving through the restricted passage becomes large, and a high damping force can be obtained due to the large passage resistance of the electrorheological fluid moving within the restricted passage and liquid column resonance, and shake vibration becomes effective. be absorbed into.

When the vibration of the vibration generating section is idle vibration, no voltage is applied to the electrode for the restricted passage, but only to the electrode for the movable body. At this time, the movable body is fixed by increasing the voltage applied to the electrode for the movable body to increase the viscosity of the electrorheological fluid around the movable body. Thereby, the electrorheological fluid flows between the small liquid chambers only through the restricted passage. Further, since no voltage is applied to the electrode for the restricted passage, the viscosity of the electrorheological fluid in the restricted passage is low. Therefore, a large amount of electrorheological fluid passes through the restricted passage, and idle vibrations are effectively absorbed by the passage resistance and liquid column resonance at that time.

When the vibration of the vibration generator is a high-frequency vibration, no voltage is applied to the restricted passage electrode and the movable body electrode. During high-frequency vibration, the restriction passage becomes clogged, so the electrorheological fluid does not flow through the restriction passage. On the other hand, since no voltage is applied to the electrode for the movable body, the viscosity of the electrorheological fluid around the electrode for the movable body is low, and the movable plate becomes movable. Therefore, the movable plate moves minutely due to high-frequency vibration, suppressing the pressure rise in the liquid chamber, and providing a low dynamic spring constant.

[0015]

Embodiments [First Embodiment] FIGS. 1 to 3 show a first embodiment of a vibration isolating device 10 according to the present invention. As shown in FIG. 1, a bottom plate 11 of this vibration isolator 10 has a mounting bolt 12 protruding from the lower center thereof, and is adapted to be fixed to the body of an automobile, for example.

The periphery of the bottom plate 11 is a cylindrical standing wall part 11A bent at right angles, and the upper end of this standing wall part 11A is connected to a flange part 11B having a rising part 11C bent outward at right angles. ing.

A flange portion 24A formed at the lower end of the outer cylinder 24 is caulked and fixed to this flange portion 11B, and a peripheral edge portion 16A of the diaphragm 16 is held between the flange portion 11B and the flange portion 24A. has been done. An air chamber 18 is formed between the diaphragm 16 and the bottom plate 11, and is communicated with the outside as necessary.

The upper end of the outer cylinder 24 is a widened part 24B whose inner diameter is gradually enlarged, and the outer periphery of the vibration absorbing main body 26 is vulcanized and bonded thereto. The vibration absorbing main body 26 is made of rubber, for example, and the outer circumference of a support base 28 is vulcanized and bonded to the inner circumference. This support base 28 is a mounting part for an automobile engine (not shown), and a mounting bolt 30 is protruded from the support base 28 to fix the automobile engine.

A liquid chamber 32 is defined here by the inner circumference of the outer cylinder 24, the lower end of the vibration absorbing main body 26, and the diaphragm 16. This liquid chamber 32 is filled with electrorheological fluid.

A hat-shaped partition 34 as a partitioning member as shown in FIG. 2 is disposed inside the liquid chamber 32.
2 is divided into a main liquid chamber 32A and a sub-liquid chamber 32B as small liquid chambers. This partition 34 is made of two half-hat-shaped partition pieces 34A cut along a vertical plane passing through the axis as shown in FIG.
The flange portion 34B of the flange portion 34B extends in the radial direction, and the flange portion 34B of the diaphragm 16 and the flange portion 11 of the bottom plate 11 extend in the radial direction.
B and the flange portion 24A of the outer cylinder 24 are clamped and fixed (see FIG. 1). The partition body 34 is made of an insulating material such as synthetic resin or ceramics.
A circular hole 36 is formed in the center of the flat plate top portion 34C.

As shown in FIG. 1, the rising part 3 of the partition body 34
4D is formed to have a thick wall, and an orifice 38 serving as a restriction passage is formed in the raised portion 34D so as to rotate around the axis of the partition body 34. Further, a through hole 22 and a through hole 22 are formed in the flat plate top portion 34C and the rising portion 34D of the partition body 34 corresponding to the orifice 38, respectively. For this reason, the orifice 38 communicates with the main liquid chamber 32A through the through hole 20, and with the auxiliary liquid chamber 32B through the through hole 22.

[0022] Electrode plates 40 and 42 are attached to opposite sides of the orifice 38 as electrodes for a restricted passage. These electrode plates 40, 42 are conductive wires 40A
, 42A to the control device 51. The control device 51 includes an ignition switch 52, an engine speed detection sensor 53, a vehicle speed detection sensor 54, and a starter 5.
5. The control device 51 receives signals from the ignition switch 52, the engine speed detection sensor 53, the vehicle speed detection sensor 54, and the starter 55, and detects whether the engine vibration is idle vibration (for example, the vehicle speed is 0 to 5 kph).
m/h, vibrations with a frequency of 20 to 40 Hz and an amplitude of ±0.1 mm that occur around engine rotation of 550 to 900 RPM)
or high-frequency vibrations that cause high-frequency muffled noise (e.g., vehicle speed of 100 km/h or more, engine speed of 3000 km/h)
Amplitude ±0.0 for frequencies above 80Hz that occur at RPM and above.
05mm vibration) or shake vibration (e.g. vehicle speed 80-120km/h, engine rotation 2500-35mm)
The amplitude is ± at frequencies below 15Hz that occur around 00RPM.
It is possible to judge whether the engine is starting (starter 55 is rotating) or whether the engine is stopped by turning OFF the ignition switch 52, and the electrode It is possible to control ON/OFF of the voltage applied to the plates 40 and 42, the energization time, and the voltage value. In addition, engine vibrations are classified into shake vibration, idle vibration, and high-frequency vibration in order of frequency.

In this embodiment, the electrode plate 40 is set as a positive pole, and the electrode plate 42 is set as a negative pole. Further, the electrorheological fluid filled in the liquid chamber 32 is, for example, 40 ml of electrorheological fluid.
A mixture consisting of ~60% by weight of silicic acid, 30-50% by weight of a low-boiling organic phase, 50-10% by weight of water and 5% by weight of a dispersion medium can be applied, for example isododecane (iso
dodekan) can be applied. This electrorheological fluid has the viscosity of a normal hydraulic fluid when no current is applied through the electrodes, and when current is applied, the viscosity changes and becomes hard depending on the electric field strength. Therefore, by controlling the voltages applied to the electrode plates 40 and 42, the viscosity of the electrorheological fluid within the orifice 38 can be increased and the passage resistance can be increased. Further, in some cases, by solidifying the electrorheological fluid, it is possible to substantially block the main liquid chamber 32A and the sub liquid chamber 32B.

On the other hand, a movable plate loose fitting groove 44 having a U-shaped cross section is formed on the inner peripheral surface of the upright portion 34D of the partition body 34 over the entire circumference. The movable plate loose fitting groove 44 is provided with the partition body 34.
An outer peripheral portion 50A of a movable plate 50, which serves as a movable body that partitions the liquid chamber 32, is loosely fitted. Note that this movable plate 50
is made of hard resin material.

Electrode plates 46 and 48 as electrodes for the movable plate are attached to the upper and lower surfaces of the movable plate loose fitting groove 44 to face each other, and these electrode plates 46 and 48 are connected to conductive wires 46A and 48A. It is connected to the control device 51 via. In this embodiment, the electrode plate 46 is set as a positive pole, and the electrode plate 48 is set as a negative pole. Therefore, by controlling the voltage applied to the electrode plates 46 and 48, the viscosity of the electrorheological fluid near the outer circumferential portion 50A of the movable plate 50 is increased, and in some cases, the electrorheological fluid is solidified, thereby preventing the movement of the movable plate 50. can.

Next, the operation of this embodiment will be explained. Bottom plate 11
is fixed to the vehicle body (not shown) via a mounting bolt 12,
The engine mounted on the support stand 28 is fixed with mounting bolts 30. Vibrations generated in the engine are transmitted to the vibration absorbing main body 26 via the support base 28, and the vibrations are absorbed by internal friction of the vibration absorbing main body 26. Furthermore, since this vibration is transmitted to the liquid chamber 32 via the vibration absorbing main body 26, the electrorheological fluid in the liquid chamber 32 moves mutually through the orifice 38, and the vibration is absorbed by the passage resistance during this movement. be done. When the engine vibration becomes high frequency, the orifice 38 becomes clogged. In this case, the small movement of the movable plate 50 restricts the increase in the liquid pressure in the main liquid chamber 32A and the sub liquid chamber 32B, resulting in a low dynamic spring constant.

Control of the vibration isolator 10 will be explained below with reference to the flowchart shown in FIG.

First, in step 100, it is determined whether the ignition switch 52 is turned on and the starter is turned on. If it is determined in step 100 that the starter is turned on, the process proceeds to step 102, where it is determined whether the engine rotation is less than 550 RPM. If it is determined in step 102 that the engine rotation is less than 550 RPM (the engine is starting), the process proceeds to step 104.
The voltage applied to the electrode plates 40, 42, 46, and 48 is turned ON.
Then, the process returns to step 100. In step 104, the voltage applied to the electrode plates 46 and 48 is increased to solidify the electrorheological fluid around the movable plate 50, thereby preventing the movable plate 50 from moving. Therefore, even if a sudden pressure change occurs in the liquid chamber due to torque fluctuation when starting the engine, no abnormal noise is generated due to the collision between the movable plate 50 and the partition 34. Further, since the electrorheological fluid near the electrode plates 46 and 48 is solidified, the electrorheological fluid passes only through the orifice 38 and moves back and forth between the main liquid chamber 86 and the sub-liquid chamber 76 as small liquid chambers. At this time,
The voltage applied to the electrode plates 40 and 42 is controlled to increase the viscosity of the electrorheological fluid within the orifice 38 to a predetermined viscosity. As a result, the electrorheological fluid with increased viscosity flows into the orifice 38.
It receives a large passage resistance inside the engine, and vibrations at the time of engine startup (so-called cranking vibrations) are effectively absorbed.

If it is determined in step 100 that the starter is not ON, and if it is determined in step 102 that the engine rotation is not less than 550 RPM (that is, a complete explosion), the process proceeds to step 106, where the engine vibration is It is determined whether or not this is idle vibration. If it is determined in step 106 that the vibration of the engine is idle vibration, the process proceeds to step 108, where the voltage applied to the electrode plates 40, 42 is turned OFF;
If the answer is N, the process proceeds to step 110. For this reason, the movable plate 50
The electrorheological fluid around the periphery of the movable plate 50 is solidified, and the movement of the movable plate 50 is prevented. As a result, the main liquid chamber 86 and the sub liquid chamber 76
A large amount of electrorheological fluid passes through the orifice 38 due to the increase in internal pressure, and the electrorheological fluid receives passage resistance from the orifice 38 and absorbs idle vibrations.

If it is determined in step 106 that the engine vibration is not idle vibration, the process proceeds to step 112, where it is determined whether or not it is shake vibration.

If it is determined in step 112 that the engine vibration is shake vibration, the process proceeds to step 114, where the applied voltages to the electrode plates 40, 42, 46, and 48 are turned on, and the process proceeds to step 110. At this time, by increasing the voltage applied to the electrode plates 46 and 48, the electrorheological fluid around the movable plate 50 is solidified, thereby preventing the movable plate 50 from moving. At the same time, by controlling the voltage applied to the electrode plates 40 and 42, the electrorheological fluid in the orifice 38 is raised to a predetermined viscosity. The electrorheological fluid flows only through the orifice 38, and the electrorheological fluid with increased viscosity encounters large passage resistance within the orifice 38, thereby absorbing shake vibrations.

Further, if it is determined in step 112 that the engine vibration is not shake vibration, the process proceeds to step 116, where the voltage applied to the electrode plates 40, 42, 46, and 48 is turned off.
The process then proceeds to step 110. That is, it is determined that engine vibration is not idle vibration or shake vibration, but is high-frequency vibration that causes high-frequency muffled noise. This allows the movable plate 50 to move up and down, and the rise in pressure in the main liquid chamber 86 or the auxiliary liquid chamber 76 due to minute vibrations of the movable plate 50 is restricted, resulting in a low dynamic spring constant during high-frequency, small-amplitude vibration.

On the other hand, in step 110, it is determined whether the ignition has been turned off. If it is determined that the ignition is not turned off, the process returns to step 100. Further, when it is determined that the ignition is turned off, the process proceeds to step 102, and the electrode plates 40, 42, 46,
48 is applied for a predetermined period of time (3 seconds in this example).
do. At this time, by increasing the voltage applied to the electrode plates 46 and 48, the electrorheological fluid around the movable plate 50 is solidified and movement of the movable plate 50 is prevented. therefore,
Even if a sudden pressure change occurs in the liquid chamber due to torque fluctuation when the engine is stopped, the movable plate 50 and the partition body 34 do not collide, so no abnormal noise is generated from the vibration isolator 10. Furthermore, since the electrorheological fluid near the electrode plates 46 and 48 is solidified, the electrorheological fluid passes only through the orifice 38 and moves back and forth between the main liquid chamber 86 and the sub-liquid chamber 76. At this time, the voltage applied to the electrode plates 40 and 42 is controlled to
The electrorheological fluid in 8 is raised to a predetermined viscosity. For this reason,
The electrorheological fluid with increased viscosity is subjected to large passage resistance within the orifice 38, and vibrations when the engine is stopped are absorbed.

Furthermore, in this embodiment, the partition 34 was formed by combining two half-hat-shaped partition pieces 34A as shown in FIG. 3, but it was formed from one hat-shaped partition 34 from the beginning. You may.

[Second Embodiment] FIGS. 5 to 7 show a second embodiment of the vibration isolator 10 according to the present invention. As shown in FIG. 5, in this vibration isolator 10, an outer cylinder 60 and an inner cylinder 62 are arranged with parallel axes, one of which is connected to the body of an automobile (not shown), and the other to an engine.

An intermediate cylinder 64 is provided between the outer cylinder 60 and the inner cylinder 62.
is disposed, and a main body rubber 66 as an elastic body is disposed between the outer cylinder 60 and the inner cylinder 62.
surrounds the outer peripheral surface of the inner cylinder 62 and embeds a part of the intermediate cylinder 64. The main body rubber 66 is made of a rubber material whose main component is natural rubber, which has excellent properties such as durability.

Further, a cavity 68 is formed above the inner cylinder 62 of the main body rubber 66 (upper side in FIG. 5).
As shown in FIG. 5, it passes through the vibration isolator 10 in the axial direction.

The intermediate cylinder 64 has ends 64 on both sides in the axial direction.
A has an enlarged diameter shape, and a part of the main body rubber 66 is vulcanized and adhered to the outer peripheral surface of the end portion 64A, and is press-fitted into the inner peripheral surface of the outer cylinder 60.

As shown in FIG. 7, a diameter-reducing recess 72 is formed in the axially intermediate portion of the intermediate cylinder 64, and rectangular notches 74 are formed in the diameter-reducing recess 72 on both sides of the inner cylinder 62 (see FIG. 7) in the vertical direction). A diaphragm 78, which is one of the constituent members of the sub-liquid chamber 76, is fitted into the upper notch 74, as shown in FIG.

Therefore, as shown in FIG. 5, most of the diaphragm 78 except for the periphery thereof protrudes into the cavity 68.

As shown in FIG. 5, an orifice unit 80 as a partition member made of an insulating material such as synthetic resin or ceramics is fitted into the diameter-reduced recess 72 of the intermediate cylinder 64. As shown in Fig. 7, this orifice unit 8
0 is a pair of semicircular orifice unit pieces 80A, 80
Consisting of orifice unit pieces 80A and 80B
One end of the two is brought into contact with each other to form a substantially C-shape. Grooves are formed in these orifice unit pieces 80A and 80B, and serve as orifices 82 as restrictive passages. Opposed to the orifice 82 is an electrode plate 40,
42 is attached, and these are connected to a control device 51 (same configuration as the first embodiment,
(not shown in FIGS. 5 to 7). In this embodiment, the electrode plate 40 is set as a positive pole, and the electrode plate 42 is set as a negative pole.

Furthermore, as shown in FIG. 5, in the lower part of the vibration isolator 10 (lower side in FIG. 5), the outer circumference of the diaphragm 84 is connected to the outer cylinder 6.
The main liquid chamber 86 is formed by the main body rubber 66 and the diaphragm 84. As shown in FIG. 6, the other ends of the orifice unit pieces 80A and 80B are arranged spaced apart from each other in the main liquid chamber 86, and a movable plate loose fitting groove 88 having a U-shaped cross section is formed in the other end. ing. A movable plate 90 as a movable body is provided in this movable plate loose fitting groove 88.
The outer circumferential portion 90A is loosely fitted. Electrode plates 46 are arranged opposite to the upper and lower surfaces of the movable plate loose fitting groove 88.
, 48 are attached, and these are connected to a control device 51 (not shown) via conductive wires (not shown). In this embodiment, the electrode plate 46 is set as a positive pole, and the electrode plate 48 is set as a negative pole. Further, the sub-liquid chamber 76 and the main liquid chamber 86 communicate with each other through openings 82A and 82B formed at the ends of the orifice 82, so that the electrorheological fluid can go back and forth between the sub-liquid chamber 76 and the main liquid chamber 86. .

Next, the operation of the second embodiment will be explained. The outer cylinder 60 is fixed to a vehicle body (not shown), and the inner cylinder 62 is connected to the engine. The vibration generated in the engine is caused by the inner cylinder 6.
2 to the main body rubber 66, and the vibration is absorbed by the internal friction of the main body rubber 66. Further, since this vibration is transmitted to the liquid chamber via the main body rubber 66, the electrorheological fluid in the liquid chamber moves mutually through the orifice 82, and the vibration is absorbed by the passage resistance during this movement. When the engine vibration becomes high frequency, the orifice 82 becomes clogged. In this case, the small movement of the movable plate 90 limits the increase in the liquid pressure in the main liquid chamber 86 and the sub liquid chamber 76, resulting in a low dynamic spring constant.

Control of the vibration isolator 10 of the second embodiment will be explained below with reference to the flowchart shown in FIG.

First, in step 100, it is determined whether the ignition switch 52 is turned on and the starter is turned on. If it is determined in step 100 that the starter is turned on, the process proceeds to step 102, where it is determined whether the engine rotation is less than 550 RPM. If it is determined in step 102 that the engine rotation is less than 550 RPM (the engine is starting), the process proceeds to step 104.
The voltage applied to the electrode plates 40, 42, 46, and 48 is turned ON.
Then, the process returns to step 100. In step 104, the voltage applied to the electrode plates 46, 48 is increased to solidify the electrorheological fluid around the movable plate 90, thereby preventing the movable plate 90 from moving. Therefore, even if a sudden pressure change occurs in the liquid chamber due to torque fluctuation when starting the engine, no abnormal noise is generated due to the collision between the movable plate 90 and the orifice unit 80. Furthermore, since the electrorheological fluid near the electrode plates 46 and 48 is solidified, the electrorheological fluid passes only through the orifice 82 and moves back and forth between the main liquid chamber 86 and the sub-liquid chamber 76. At this time, by controlling the voltage applied to the electrode plates 40 and 42, the orifice 8
Increase the viscosity of the electrorheological fluid in 2 to a predetermined viscosity. As a result, the electrorheological fluid with increased viscosity is subjected to a large passage resistance within the orifice 82, and vibrations at the time of starting the engine (so-called cranking vibrations) are effectively absorbed.

If it is determined in step 100 that the starter is not ON, and if it is determined in step 102 that the engine rotation is not less than 550 RPM (that is, a complete explosion), the process proceeds to step 106, where the engine vibration is It is determined whether or not this is idle vibration. If it is determined in step 106 that the vibration of the engine is idle vibration, the process proceeds to step 108, where the voltage applied to the electrode plates 40, 42 is turned OFF;
If the answer is N, the process proceeds to step 110. For this reason, the movable plate 90
The electrorheological fluid around the movable plate 90 is solidified, and movement of the movable plate 90 is prevented. As a result, the main liquid chamber 86 and the sub liquid chamber 76
A large amount of electrorheological fluid passes through the orifice 82 due to the increase in internal pressure, and the electrorheological fluid receives passage resistance from the orifice 82 and absorbs idle vibrations.

If it is determined in step 106 that the engine vibration is not idle vibration, the process proceeds to step 112, where it is determined whether or not it is shake vibration.

If it is determined in step 112 that the vibration of the engine is shake vibration, the process proceeds to step 114, where the applied voltages to the electrode plates 40, 42, 46, and 48 are turned on, and the process proceeds to step 110. At this time, by increasing the voltage applied to the electrode plates 46 and 48, the electrorheological fluid around the movable plate 90 is solidified, thereby preventing the movable plate 90 from moving. At the same time, by controlling the voltage applied to the electrode plates 40 and 42, the electrorheological fluid in the orifice 82 is raised to a predetermined viscosity. The electrorheological fluid flows only through the orifice 82, and the electrorheological fluid with increased viscosity experiences large passage resistance within the orifice 82, thereby absorbing shake vibrations.

If it is determined in step 112 that the engine vibration is not shake vibration, the process proceeds to step 116, where the voltage applied to the electrode plates 40, 42, 46, and 48 is turned off.
The process then proceeds to step 110. That is, it is determined that engine vibration is not idle vibration or shake vibration, but is high-frequency vibration that causes high-frequency muffled noise. As a result, the movable plate 90 can be moved up and down, and the pressure increase in the main liquid chamber 86 or the sub-liquid chamber 76 is restricted due to minute vibrations of the movable plate 90, thereby obtaining a low dynamic spring constant during high-frequency, small-amplitude vibration.

On the other hand, in step 110, it is determined whether the ignition has been turned off. If it is determined that the ignition is not turned off, the process returns to step 100. Further, when it is determined that the ignition is turned off, the process proceeds to step 102, and the electrode plates 40, 42, 46,
48 is applied for a predetermined period of time (3 seconds in this example).
do. At this time, by increasing the voltage applied to the electrode plates 46 and 48, the electrorheological fluid around the movable plate 90 is solidified and movement of the movable plate 90 is prevented. therefore,
Even if a sudden pressure change occurs in the liquid chamber due to torque fluctuation when the engine is stopped, the movable plate 90 and the orifice unit 80 do not collide, so no abnormal noise is generated from the vibration isolator 10. Furthermore, since the electrorheological fluid near the electrode plates 46 and 48 is solidified, the electrorheological fluid passes only through the orifice 82 and moves back and forth between the main liquid chamber 86 and the sub-liquid chamber 76. At this time, the voltage applied to the electrode plates 40 and 42 is controlled to raise the electrorheological fluid in the orifice 82 to a predetermined viscosity. Therefore, the electrorheological fluid with increased viscosity is subjected to large passage resistance within the orifice 82, and vibrations when the engine is stopped are absorbed.

[Third Embodiment] FIGS. 8 and 9 show a third embodiment of the vibration isolator 10 according to the present invention.

As shown in FIGS. 8 and 9, this vibration isolating device 1
Similarly to the vibration isolator 10 shown in the second embodiment, the outer cylinder 60 and the inner cylinder 62 are arranged with parallel axes so that one is connected to the body of an automobile (not shown) and the other is connected to the engine. It has become.

An intermediate cylinder 64 is provided between the outer cylinder 60 and the inner cylinder 62.
A main body rubber 66 as an elastic body is provided between the outer cylinder 60 and the inner cylinder 62.

As shown in FIGS. 8 and 9, a stopper body 98 is integrally formed at the lower part (lower side in FIG. 8) of the diameter-reducing recess 72 formed in the axially intermediate portion of the intermediate cylinder 64.

When an engine is connected to the intermediate cylinder 64, this stopper body 98 stops the intermediate cylinder 64 due to the engine load.
Even if the movable plate 90, diaphragm 78, etc. are moved downward, the stopper body 98 supports the intermediate cylinder 64 and the main body rubber 66, thereby protecting the movable plate 90, the diaphragm 78, etc. The other functions are the same as those of the vibration isolator 10 of the second embodiment, so the explanation will be omitted.

In this embodiment, when the ignition switch 52 is turned from ON to OFF, the electrode plate 40,
Although the voltage is applied to the electrode plates 42, 46, and 48 for a predetermined period of time, the present invention is not limited thereto.
Control may be performed so that voltages are applied to 0, 42, 46, and 48. Even in this case, since the movable plates 50, 90 are prevented from moving when the engine is stopped, no collision noise is generated.

Further, in this embodiment, when the engine is started and stopped, the control device 51 controls the electrode plate 40,
Although voltage is applied to the electrode plates 46, 42, and 48, the present invention is not limited thereto, and the movable plate 50 can be moved by applying a voltage to at least the electrode plates 46, 48 when the engine is started and stopped. , 90 can be prevented from moving and the generation of abnormal noise can be prevented, so it is not necessary to apply a voltage to the electrode plates 40 and 42.

Furthermore, in this embodiment, the electrode plates 40 and 46 were set as positive poles, and the electrode plates 42 and 48 were set as negative poles.
The present invention is not limited to this, but the electrode plates 40 and 46 can be
The electrode plates 42 and 48 may be set to positive electrodes.

[0059]

As explained above, the method for controlling a vibration isolator according to the present invention has an advantage in that it can prevent the generation of abnormal noise due to the collision between the movable body and the partition member when starting and stopping the engine. It has a good effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a vibration isolator according to a first embodiment of the present invention.

FIG. 2 is an overall perspective view showing a partition of the vibration isolator according to the first embodiment of the present invention.

FIG. 3 is an overall perspective view showing a partition piece of the vibration isolator according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing control of the vibration isolator.

5 shows a vibration isolator according to a second embodiment of the present invention, and is a sectional view taken along the line V-V in FIG. 6. FIG.

6 shows a vibration isolator according to a second embodiment of the present invention, and is a sectional view taken along the line VI-VI in FIG. 5. FIG.

FIG. 7 is an exploded perspective view showing a vibration isolator according to a second embodiment of the present invention.

8 shows a vibration isolator according to a third embodiment of the present invention, and is a sectional view taken along the line VIII-VIII in FIG. 9. FIG.

9 shows a vibration isolator according to a third embodiment of the present invention, and is a sectional view taken along the line IX-IX in FIG. 8. FIG.

[Explanation of symbols]

10 Vibration isolator 32 Liquid chamber 32A Main liquid chamber (small liquid chamber) 32B Sub-liquid chamber (small liquid chamber) 34 Partition body (partition member) 38 Orifice (restriction passage) 40
Electrode plate (electrode for restricted passage) 42 Electrode plate (electrode for restricted passage) 46 Electrode plate (electrode for movable plate) 48 Electrode plate (electrode for movable plate) 50 Movable plate (movable body) 76 Sub-liquid chamber (Small liquid chamber) 80 Orifice unit (partition member) 82
Orifice (restricted passage) 86
Main liquid chamber (small liquid chamber) 90 Movable plate (movable body)

Claims (2)

[Claims] 1. A liquid chamber provided between a vibration generating part and a vibration receiving part and partitioned into a plurality of small liquid chambers by a partition member;
A restriction passage that communicates these small liquid chambers, an electrorheological fluid that is filled in the liquid chamber and whose viscosity changes depending on the magnitude of the applied electric field, and the partition that is disposed between the small liquid chambers. The electrorheological fluid in a vibration isolating device having a movable body supported so as to be minutely movable with respect to a member, and electrodes for the movable body provided to sandwich the movable body and for supplying current to the electrorheological fluid. A method for controlling energization to the electrode for the movable body to control the viscosity of the movable body, the method comprising applying a voltage to the electrode for the movable body when starting the engine and/or stopping rotation of the engine. How to control the shaking device. 2. A liquid chamber provided between the vibration generating part and the vibration receiving part and partitioned into a plurality of small liquid chambers by a partition member;
A restriction passage that communicates these small liquid chambers, an electrorheological fluid filled in the liquid chamber and whose viscosity changes depending on the magnitude of an applied electric field, and an electrorheological fluid provided in the restriction passage for energizing the electrorheological fluid. a movable body disposed between the small liquid chamber and supported so as to be able to move minutely with respect to the partition member; A method for controlling energization to the restricted passage electrode and the movable body electrode for controlling the viscosity of the electrorheological fluid in a vibration isolating device comprising: an electrode for a movable body for energizing an engine; When the engine is started and/or when the rotation of the engine is stopped, a voltage is applied to the electrode for the restriction passage and the electrode for the movable body, and when the vibration of the vibration generating section is shake vibration, the electrode for the restriction passage and the electrode for the movable body are applied. A voltage is applied to the electrode for the movable body, and when the vibration of the vibration generating part is idle vibration, no voltage is applied to the electrode for the restriction passage, but a voltage is applied to the electrode for the movable body, and the vibration of the vibration generating part is A method for controlling a vibration isolator, characterized in that when the vibration is a high frequency vibration, no voltage is applied to the electrode for the restricted passage and the electrode for the movable body.