JPH06330980A - Mounting device for power unit - Google Patents

Abstract

PURPOSE:To eliminate a sheet material to hold liquidtightness of a main liquid chamber and to constantly perform proper control of a dynamic spring through smooth transmission vibration from a moving member to non-compressive fluid in the main liquid chamber. CONSTITUTION:A main liquid chamber 20 to which vibration from an engine is inputted and an auxiliary liquid chamber 21 the volume change of which is allowed by means of a diaphragm 15 are partitioned away from each other by means of partition walls 16 and 17. Since a moving plate 41 is disposed in a communication hole 40 for the partition walls 16 and 17 in a state that a microdistance S is provided therebetween, non-compressive fluid in the main and auxiliary liquid chambers 20 and 21 is prevented from outflow and inflow through the distance S through a self viscous action during vibration of the moving plate 41 by a voice coil 39. Liquidtightness between the two liquid chambers 20 and 21 is ensured. Therefore, there is no need for a sheet material to hold liquidtightness and there is no fear of vibration of the moving material 41 being impeded by the sheet material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting device for a power unit, and more particularly to a mounting device for a power unit, the damping characteristic of which can be arbitrarily changed according to a vibration state input from the power unit, a driving state of a vehicle, or the like. is there.

[0002]

2. Description of the Related Art As is well known, a power unit including an engine is mounted on a vehicle body through a mounting device to prevent transmission of vibrations from the power unit to the vehicle body, or engine shake that occurs during sudden acceleration, sudden deceleration, starting or braking. It prevents the engine from shaking. Examples of this type of mounting device include
The one mainly described in Japanese Patent No. 39481 is intended to prevent vibration transmission from the power unit to the vehicle body.

FIG. 10 is a sectional view showing a conventional mounting device for a power unit.

As shown in the figure, a housing 301 of the mounting device has a substantially cylindrical shape, and its housing 30
The upper opening of No. 1 is closed by a stay 303 via an elastic body 302 made of rubber. A disk-shaped partition wall 304 is positioned and fixed in the housing 301, and the stay 303
A main liquid chamber 305 in which a non-compressible fluid is enclosed is formed between and. Air chamber 30 recessed in the center of the upper surface of partition wall 304
6, a movable member 308 having a movable coil 307 wound around the outer periphery thereof is disposed, and a ring-shaped ferrite magnet 309 is provided around the movable member 308 so as to face the movable coil 307.
Are arranged, and the movable coil 307 and the movable member 3 are provided.
08 and the ferrite magnet 309, the voice coil 31
Configures 0. An air chamber 306 is provided on the upper surface of the partition wall 304.
Rubber sheet material 311 is adhered so as to close the
The sheet material 311 prevents the incompressible fluid in the main liquid chamber 305 from flowing into the air chamber 306. The movable member 308 is adhered to the lower surface of the sheet material 311 to restrict movement in the direction orthogonal to the axis L of the mounting device, while allowing a slight movement in the direction along the axis L. ing.

A diaphragm 312 is positioned and fixed on the lower side of the partition wall 304 to form an auxiliary liquid chamber 313 in which an incompressible fluid is enclosed between the diaphragm 312 and the partition wall 304. The auxiliary liquid chamber 313 is a partition wall. Orifice 31 formed around 304
4, the fluid is communicated with the main liquid chamber 305, and a damping action is exerted when the incompressible fluid passes through the orifice 314 as is well known.

The mounting device thus constructed is arranged between a vehicle body (not shown) and a power unit, and the housing 301 is fixed to the vehicle body side, and the bolt 303a welded to the upper surface of the stay 303 is fixed to the power unit side. Used in. When the elastic body 302 bends in the vertical direction due to the vibration from the power unit, the main liquid chamber 3
Periodic vibrations are input to the incompressible fluid inside 05. At this time, an alternating current having the same cycle as the vibration is passed through the movable coil 307, and the movable member 308 is operated so as to input the vibration of the opposite phase to the vibration from the power unit to the incompressible fluid in the main liquid chamber 305. Since the vibration is forcibly performed, the dynamic spring constant of the mounting device is reduced, and the vibration from the power unit is blocked.

[0007]

In the above-described conventional mounting apparatus, since the sheet material 311 maintains the liquid tightness between the main liquid chamber 305 and the inside of the air chamber 306, the vibration of the movable member 308 does not occur. Main liquid chamber 3 via sheet material 311
05 is transmitted to the incompressible fluid. That is, since the rubber sheet material 311 acts so as to hinder the vibration of the movable member 308, the vibration is not smoothly transmitted to the incompressible fluid, the dynamic spring constant is not sufficiently reduced, and the vibration is blocked. It was incomplete.

Further, as is well known, the efficiency of the voice coil 310 becomes better as the air gap between the movable coil 307 and the ferrite magnet 309 becomes narrower. However, in the above mounting device, the movable member 308 is formed by the sheet material 311.
Since the sheet material 311 is positioned, when the sheet material 311 bends due to the displacement of the movable member 308, the movable member 308 shifts from the axis L and the air gap changes. Therefore, the air gap cannot be sufficiently narrowed, and it is necessary to increase the size of the voice coil 310 in anticipation of a decrease in efficiency.
As a result, it became a factor of increasing the size of the entire mounting device.

Therefore, in the present invention, the sheet material for maintaining the liquid tightness of the main liquid chamber is omitted, and the vibration is smoothly transmitted from the movable member to the incompressible fluid in the main liquid chamber to keep the dynamic spring constant constant. It is an object of the present invention to provide a mounting device for a power unit, which can be precisely controlled, can prevent the influence of a sheet material or the like from reaching an actuator that drives a movable member, and can improve the efficiency of the actuator and downsize it. is there.

[0010]

A mounting device for a power unit according to the present invention is a mounting device disposed between a vehicle body and a power unit, which is filled with an incompressible fluid, and is subjected to an input vibration from the power unit. In a mounting device of a power unit, which has a main liquid chamber whose volume is changed, a movable member disposed on one side of the main liquid chamber is vibrated by an actuator in association with the input vibration, and a partition wall Is formed so as to be adjacent to the main liquid chamber through which a non-compressible fluid is sealed and the volume of which is allowed to change, and the partition wall which communicates the main liquid chamber and the sub liquid chamber. As a result, the movable member can vibrate inside in a direction connecting the main liquid chamber and the sub liquid chamber,
In addition, a communication hole is provided between the inner circumference and the outer circumference of the movable member with a minute gap formed therebetween.

[0011]

In the present invention, since the distance between the movable member and the communication hole is small, the incompressible fluid in the main liquid chamber and the sub liquid chamber flows in and out of the space by viscous action of itself when the movable member vibrates. Is prevented. Therefore, when the movable member vibrates in response to the input vibration from the power unit, the vibration is input to the incompressible fluid in the main liquid chamber while changing the volume of the sub liquid chamber, and the spring constant of the mounting device is changed. To do.

Since a member for maintaining liquid tightness between the main liquid chamber and the sub liquid chamber is not particularly required as described above, there is a possibility that vibration of the movable member is hindered by the member for maintaining liquid tightness. Therefore, it is possible to smoothly transmit the vibration from the movable member to the incompressible fluid in the main liquid chamber. Further, since the influence of the member for maintaining the liquid tightness does not affect the actuator, for example, when the actuator is configured as a voice coil, the air gap between the movable coil and the magnetic body can be reduced and the efficiency of the actuator can be reduced. It is possible to improve and miniaturize.

[0013]

【Example】

[First Embodiment] A first embodiment of the present invention will be described below.

FIG. 1 is a schematic diagram showing the entire structure of a mounting device for a power unit, which is a first embodiment of the present invention.
FIG. 2 is a sectional view showing details of the engine mount in the mounting device for the power unit according to the first embodiment of the present invention.

As shown in FIG. 1, the mounting apparatus of this embodiment controls an engine mount 3 arranged between a stay 1a of a vehicle body 1 and a stay 2a of an engine 2 which is a power unit, and the engine mount 3. Electronic control unit (hereinafter simply referred to as “ECU”) 4, vehicle body 1
Acceleration sensor 5, which is mounted on the stay 1a of the vehicle 1 and outputs an acceleration signal G according to the vibration generated in the vehicle body 1, the engine 2
A rotation angle sensor 7, which is provided in the distributor 6 and outputs a rotation angle signal Ne related to its rotation speed,
And a reference position sensor 8 which outputs a reference position signal G2 indicating the reference position of the crank angle. The rotation angle sensor 7 and the reference position sensor 8 are a kind of magnet pickup.

The detailed structure of the engine mount 3 will be described. As shown in FIG. 2, the engine mount 3 has a lower end bolt 13 fastened to the vehicle body 1 side and an upper end bolt 12 fastened to the engine 2 side. Used. The mount housing 14 of the engine mount 3 has a bottomed cylindrical shape that opens upward, and a disc-shaped diaphragm 15, a lower partition wall 16 and an upper partition wall 17 are superposed on an opening edge 14a that is bent to the outer peripheral side. It is installed in. On the upper partition wall 17, a ring-shaped lower bracket 18a, a dome-shaped rubber elastic body 18b, and a disc-shaped upper bracket 18c are provided, and a cushioning member 18 is provided.
The opening edge 14a of the mount housing 14 is fixed to the lower bracket 18a of the cushioning member 18 by a plurality of bolts 19 in a state where the diaphragm 15, the upper partition 16 and the lower partition 17 are fastened together. The lower partition wall 1
6 and the upper partition 17 and between the upper partition 17 and the lower bracket 18a are kept liquid-tight by O-rings 16a and 17a, respectively.

With the above structure, the main liquid chamber 20 is provided between the buffer member 18 and the upper partition wall 17, the sub liquid chamber 21 is allowed to change its volume by the diaphragm 15 between the lower partition wall 16 and the diaphragm 15, and further. Air chambers 22 open to the atmosphere are formed between the diaphragm 15 and the mount housing 14, respectively. An arc-shaped groove 23a centering on the axis L of the engine mount 3 is formed on the upper surface of the lower partition wall 16, and one end of the groove 23a is formed through the opening 23b formed in the upper partition wall 17 to form the main liquid. It opens into the chamber 20 and the other end of the groove 23 a opens into the sub liquid chamber 21 through an opening 23 c formed in the lower partition 16. And these grooves 23a
The main liquid chamber 20 and the sub liquid chamber 21 through the openings 23b and 23c.
An orifice 23 that communicates with and is formed. As will be described later, the orifice 23 has a groove 23a so as to have a damping action particularly when vibration in a low frequency range (20 to 40 Hz) is input to the engine mount 3. The cross-sectional area and length of are set.

A convex portion 24 penetrating the elastic body 18b is formed in the center of the lower surface of the upper bracket 18c of the cushioning member 18, and the injection hole 24a formed in the convex portion 24 is located above the upper bracket 18c and in the main liquid. It communicates with the inside of the chamber 20. The injection hole 24a is used for injecting an incompressible fluid into the main liquid chamber 20 and the sub liquid chamber 21, and is normally closed by a bolt 25 from above. Upper bracket 18
A disk-shaped stay 26 is fixed on c by a plurality of screws 27, and the bolt 12 fixed to the engine side is integrally formed at the center of the upper surface of the stay 26.

A first magnetic body 31 is fixed to the bottom of the mount housing 14 by a plurality of screws 32, and a cylindrical portion 31a corresponding to the axis L is provided on the upper surface of the magnetic body 31.
Are formed. The cylindrical portion 31 is provided on the first magnetic body 31.
A ring-shaped ferrite magnet 3 that surrounds a.
3 is bonded, and the ring-shaped second magnetic body 34 is also bonded on the ferrite magnet 33, and the inner circumference of the second magnetic body 34 is on the outer circumference of the cylindrical portion 31 a of the first magnetic body 31. On the other hand, they are opposed to each other at a predetermined interval. A support ring 35 is adhered on the second magnetic body 34 in a positioned state, and two dampers 36 made of non-woven fabric are stretched around the inner circumference of the support ring 35 at predetermined intervals in the vertical direction. A bottomed cylindrical yoke 37 that opens downward is supported. Both dampers 36 have a bellows-shaped cross section and restrict a movement of the yoke 37 in a direction orthogonal to the axis L while allowing a slight movement in a direction along the axis L. A movable coil 38 is wound around the lower outer circumference of the yoke 37.
Is inserted between the outer circumference of the cylindrical portion 31a of the first magnetic body 31 and the inner circumference of the second magnetic body 34, and has a predetermined distance from both magnetic bodies 31, 34. Holding

The first magnetic body (pole piece) 31, the ferrite magnet 33, the second magnetic body (plate) 34, and the yoke 37 constitute a so-called voice coil 39 as an actuator. , 3
When an alternating current is applied to the movable coil 38 of the yoke 37 in the DC magnetic field formed by the magnet No. 4 and the ferrite magnet 33, the yoke 37 vibrates in the direction along the axis L according to Fleming's left-hand rule.

A circular communication hole 40 is formed in the upper partition wall 17 and the lower partition wall 16 about the axis L, and the main liquid chamber 20 and the sub liquid chamber 21 communicate with each other through the communication hole 40. There is. A movable plate 41 serving as a disk-shaped movable member is disposed in a horizontal posture in the communication hole 40, and a mounting portion 41a is projectingly provided at the center of the lower surface of the movable plate 41. This mounting part 41
a is a mounting portion 3 projecting from the center of the upper surface of the yoke 37.
The mounting portion 37a of the yoke 37, the central portion of the diaphragm 15, and the mounting portion 41a of the movable plate 41 are connected to each other by bolts 42 so as to face each other across the central portion of the diaphragm 15. Therefore, when the movable coil 38 is energized as described above, the movable plate 41 together with the yoke 37 vibrates in the communication hole 40 in the direction along the axis L.
The distance S between the outer circumference of the movable plate 41 and the inner circumference of the communication hole 40 is narrowed as much as possible while avoiding contact between the two members 41, 40 when the movable plate 41 vibrates. 1 to
It is set to a minute value of about 0.3 mm. Therefore, the incompressible fluid in the main liquid chamber 20 and the sub liquid chamber 21 is not moved by the movable plate 41.
It is possible to prevent the space S from flowing in and out due to its own viscous action at the time of vibration, and it can be dynamically considered that the communication hole 40 is almost completely closed by the movable plate 41.

As described above, in this embodiment, the distance S between the outer circumference of the movable plate 41 and the inner circumference of the communication hole 40 is narrowed, and the viscous action of the incompressible fluid is utilized to make the main liquid chamber 20 and the sub liquid chamber. The liquid tightness with 21 is secured. Therefore, unlike the mounting device described in the related art, the sheet material 311 (shown in FIG. 10) for maintaining the liquid tightness is not required, and the vibration of the movable plate 41 may be hindered by the sheet material 311 or the like. Since there is no such vibration, the vibration can be smoothly transmitted from the movable plate 41 to the incompressible fluid in the main liquid chamber 20. Further, the movable plate 41 is surely displaced on the axis L without being affected by the sheet material 311 or the like, and at this time, the second magnetic body 3
Since the air gap between the movable coil 38 and the movable coil 38 does not change, the air gap can be reduced to improve efficiency and the voice coil 39 can be downsized.

Next, the structure of the above-mentioned ECU 4 will be described.

FIG. 3 is a block diagram showing the configuration of the ECU of the mounting device for the power unit according to the first embodiment of the present invention, and FIG. 4 is the signal waveform handled by the ECU of the mounting device for the power unit according to the first embodiment of the present invention. 2 is a time chart showing.

The ECU 4 is a central processing unit (hereinafter, simply C
PU) 51, data bus 52, timer 53, waveform shaping IC 54, counter 55, I / O port 56, bandpass filter 57a, analog input port 57, A /
A random access memory (hereinafter, simply referred to as “RAM”) that temporarily stores the processing data of the D conversion circuit 58 and the CPU 51.
59), a read-only memory (hereinafter simply referred to as “ROM”) 6 that stores the control program of the CPU 51.
0, I / O port 61, voice coil drive circuit 62, and power supply circuit 63, and a key switch 64.
Is turned on, the power from the battery 65 is supplied to the power supply circuit 6
3 and the ECU 4 is activated.

The rotation angle signal Ne from the rotation angle sensor 7 and the reference position signal G2 from the reference position sensor 8 are
The waveform shown in (a) of FIG. 4 is input to the waveform shaping IC 54, and the waveform shaping IC 54 outputs the signals Ne and G2 thereof.
After shaping the rectangular wave shown in (b), I / O port 56
To the data bus 52 via. Further, the rotation angle signal Ne after waveform shaping is counted by the counter 55,
The count value is output to the data bus 52. on the other hand,
The acceleration signal G from the acceleration sensor 5 passes through the bandpass filter 57a and is converted into vibration acceleration g shown in (c) of FIG.
It is input to the / D conversion circuit 58, and is output to the data bus 52 after A / D conversion.

The CPU 51 creates a control signal Vout shown in FIG. 4 (d) based on the input vibration acceleration g and I / I
Output to the voice coil drive circuit 62 via the O port 61. The voice coil drive circuit 62 is supplied with power from the battery 65, and has a drive current i proportional to the control signal Vout.
Is output to the voice coil 39, and the drive current i causes the movable coil 38 of the voice coil 39 to be energized to move the movable plate 41.
Vibrate.

Next, taking a four-cycle in-line four-cylinder engine as an example, a process in which vibration is input from the engine 2 and attenuated by the engine mount 3 will be described.

FIG. 5 is a characteristic diagram showing the relationship between the vibration acceleration and the control signal in the power unit mounting apparatus according to the first embodiment of the present invention. FIG. 6 shows the power unit mounting apparatus according to the first embodiment of the present invention. It is a characteristic view which shows the relationship between a drive current and the lift amount of a movable plate.

In a 4-cycle in-line 4-cylinder engine, two revolutions (720 °)
(4) CA, the explosion stroke is executed once every 180 ° CA, so the vibration (primary vibration) caused by the explosion of engine 2 is approximate to a sine wave with 180 ° CA as one cycle. it can.
This vibration is transmitted to the vehicle body 1 side via the engine mount 3, and is detected by the acceleration sensor 5 together with the vibration caused by running of another vehicle. The band-pass filter 57a passes only the frequency band of 10 to 200 Hz due to the explosion of the engine 2 from the acceleration signal G of the acceleration sensor 5, and the vibration acceleration g shown in FIG.
Is input to the CPU 51. In the figure, at the maximum value of the vibration acceleration g, from the engine 2 to the engine mount 3
When the vibration in the compression direction is input to the elastic body 18b, the elastic body 18b bends downward, and at the minimum value of the vibration acceleration g, the vibration in the extension direction is input to the engine mount 3 and the elastic body 18b bends upward. To do.

Then, based on this vibration acceleration g, EC
U4 reduces the dynamic spring constant of the engine mount 3 by executing anti-phase control so that vibration from the engine 2 is blocked by the engine mount 3 during steady operation of the engine 2, and during transient operation of the engine 10. For example, during rapid acceleration, rapid deceleration, starting, braking, etc., in-phase control is executed to suppress the engine shake, and the dynamic spring constant of the engine mount 3 is increased.

During execution of the anti-phase control, the control signal Vout of the CPU 51 is generated so as to be inversely proportional to the vibration acceleration g according to the characteristic shown by the solid line in FIG. 5, and the voice coil is proportional to the control signal Vout. The drive current i is determined by the drive circuit 62. Since the voice coil 39 has the characteristic shown in FIG. 6 in which the lift amount 1 of the movable plate 41 is increased in proportion to the drive current i flowing through the movable coil 38, finally as shown by the solid line in FIG. 4 (d). In addition, the lift amount 1 of the movable plate 41 is controlled by following a substantially sine wave having a cycle of 180 ° CA so that the phase is always opposite to the vibration acceleration g. As is well known, since the voice coil 39 has good response, the upper limit frequency of the primary vibration of the engine 2 (200 Hz
The drive current i can be controlled based on the vibration acceleration g.

As described above, since the movable plate 41 is displaced downward when the elastic body 18b is bent downward due to the input vibration from the engine 2, the main liquid chamber 2 is caused by the vibration input in the compression direction.
The pressure increase within 0 is suppressed, and the dynamic spring constant of the engine mount 3 is dramatically reduced. As a result, engine 2
The vibrations from are reliably blocked by the engine mount 3, the transmission rate of the vibrations is significantly reduced, and the muffled sound is reliably suppressed. The movable plate 41 at this time
Is also input to the non-compressible fluid in the sub liquid chamber 21, but the sub liquid chamber 21 is allowed to change in volume due to the deflection of the diaphragm 15, so that the vibration of the movable plate 41 is not disturbed.

Further, during the execution of the in-phase control, FIG.
A control signal Vout of the CPU 51 is generated so as to be proportional to the vibration acceleration g according to the characteristic indicated by the two-dot chain line in FIG.
The voice coil drive circuit 6 is proportional to the control signal Vout.
The drive current i is determined by 2. And the drive current i
In proportion to the lift amount l of the movable plate 41 of the voice coil 39
Finally, as shown by the chain double-dashed line in Fig. 4 (d), a sine wave with 180 ° CA as one cycle is always used so that the vibration acceleration g always has the same phase. Following this, the lift amount 1 of the movable plate 41 is controlled.

That is, since the movable plate 41 is displaced upward when the elastic body 18b is bent downward by the input vibration from the engine 2, the pressure increase in the main liquid chamber 20 becomes more remarkable, and the engine mount 3 The dynamic spring constant is dramatically increased, and the engine shake is suppressed.

Here, in both the control of the reverse phase and the control of the same phase, the waveform of the drive current i (the lift amount 1 of the movable plate 41) is delayed by a predetermined delay time Δθ with respect to the waveform of the vibration acceleration g. Controlled to
The amplitude W of the waveform of the drive current i is controlled so as to decrease as the engine speed N increases. That is, as for the delay time Δθ, it is necessary to cause the drive current i to precede the vibration acceleration g actually generated in the vehicle body 1 by considering the response delay of the voice coil 39, etc. It is adjusted so that the drive current i is substantially advanced. Since the appropriate delay time Δθ changes according to the engine rotation speed N, it is set according to the engine rotation speed N as with the amplitude W of the drive current i. Regarding the amplitude W of the drive current i, as is well known, the amplitude of the vibration acceleration g is reduced and the amount of bending of the elastic body 18b of the engine mount 3 is reduced as the engine 2 is in the higher rotation range. Then, the amplitude W of the drive current i is reduced in order to reduce the displacement of the movable plate 41.

By the way, when the vibration transmissibility is to be reduced in the entire rotation range of the engine 2 only by controlling the reverse phase of the movable plate 41, the vibration acceleration g is 40 Hz (120 rpm at the engine speed N).
In a low frequency range of 0 rpm or less, the lift amount 1 of the movable plate 41 (the amplitude W of the drive current i) needs to be considerably increased, and the power consumption of the voice coil 39 increases. here,
In the engine mount 3 of this embodiment, since the characteristics of the orifice 23 are set for the vibration in the low frequency range (20 to 40 Hz) as described above, the engine mount 3
The main liquid chamber 20 and the sub liquid chamber 2 according to the bending of the elastic body 18b of
The non-compressible fluid in 1 repeats inflow and outflow alternately through the orifice 23 to exert a vibration damping action. That is, in the low speed range from idle to 1200 rpm, the vibration damping action of the movable plate 41 is supplemented by the orifice 23, and the vibration transmissibility is reduced. Therefore, it is not necessary to increase the amplitude W of the drive current i so much, and the power consumption of the voice coil 39 in the low frequency range can be reduced.

Next, the processing of the CPU 51 when executing the above-mentioned reverse phase control and in-phase control will be described.

FIG. 7 is a flow chart showing the processing of the CPU in the mounting device of the power unit according to the first embodiment of the present invention.

The routine of FIG. 7 is executed every predetermined time,
First, the CPU 51 determines in step S1 the rotation angle signal Ne of the rotation angle sensor 7 and the reference position signal G2 of the reference position sensor 8.
Is input via the waveform shaping IC 54, and the acceleration signal G of the acceleration sensor 6 is input as vibration acceleration g via the bandpass filter 57a. Then, step S2
In step S3, it is determined whether or not the reference position signal G2 has just been input. Further, in step S4, the delay time Δθ and the amplitude W of the drive current i are calculated from the engine rotation speed N according to a map (not shown) stored in the ROM 60, and in step S5, R
These values Δθ, W stored in the AM 59 are updated to new calculated values. After that, in step S6, the delay time Δθ and the amplitude W of the drive current i are added, and then the value of the control signal Vout at that time is calculated from the current value of the vibration acceleration g according to the characteristic of FIG. Output to the coil drive circuit 62. That is, the control signal V at this time
out is inversely proportional to the vibration acceleration g if reverse phase control,
In the case of in-phase control, it is set in proportion to the vibration acceleration g.

In step S2, the reference position signal G
When it is determined that it is not immediately after the input of 2, the process directly proceeds to step S6, and the control signal Vout is calculated and output in consideration of the delay time Δθ and the amplitude W of the RAM 59.
That is, the delay time Δθ and the amplitude W of the drive current i are updated to the optimum values each time the reference position signal G2 is input.

Based on the control signal Vout thus created, the voice coil drive circuit 62 outputs the drive current i having the waveform shown in FIG. 4D to the voice coil 39, and the movable coil 38 is energized. Then, the movable plate 41 is vibrated.

As described above, in the mounting device for the power unit of this embodiment, the partition walls 16 and 17 separate the main liquid chamber 20 into which the vibration from the engine 2 is input and the auxiliary liquid chamber 21 whose volume is allowed to change by the diaphragm 15. A small space S is formed in the communicating hole 40 formed in the partition walls 16 and 17 by partitioning.
The movable plate 41 is arranged in the state where the above is formed, and the voice coil 39 vibrates the movable plate 41 in the direction along the axis L of the engine mount 3.

Therefore, when the movable plate 41 vibrates, the incompressible fluid in the main liquid chamber 20 and the sub liquid chamber 21 is prevented from flowing into and out of the space S due to its own viscous action. Since the liquid tightness is secured between the sheets, the sheet material 311 and the like for maintaining the liquid tightness described in the prior art is not necessary. Therefore, there is no possibility that the vibration of the movable plate 41 is hindered by the sheet material 311 and the movable plate 41 moves from the main liquid chamber 20 to the main liquid chamber 20.
The vibration can be smoothly transmitted to the incompressible fluid inside, and the dynamic spring constant is always accurately controlled in both the in-phase control and the in-phase control, and the vibration from the engine 2 is surely cut off, and The engine shake can be surely suppressed.

Further, since the movable plate 41 is surely displaced on the axis L without being affected by the sheet material 311 or the like, the air gap between the second magnetic body 34 and the movable coil 38 is reduced. The efficiency can be improved, the voice coil 39 can be downsized, and the engine mount 3 as a whole can be downsized.

On the other hand, the mounting apparatus of this embodiment has various advantages in addition to the above-mentioned advantages, which will be listed and described below.

(1) As is clear from FIG. 2, the main liquid chamber 2
Communication hole 4 of partition walls 16 and 17 for partitioning 0 and the sub liquid chamber 21
Since the movable plate 41 is arranged in the 0, other parts,
For example, space efficiency is better than in the case where the movable plate 41 is provided inside the elastic body 18b, and the engine mount 3 can be further downsized.

(2) The voice coil 39 is provided in the air chamber 22 below the sub liquid chamber 21, and the movable plate 41 in the communication hole 40 is vibrated via the mounting portions 37a and 41a. Therefore, there is no possibility that the wiring that connects the voice coil 39 and the ECU 4 is immersed in the incompressible fluid to cause a short circuit, and the operation can be ensured.

(3) Since the injection hole 24a for injecting the incompressible fluid into the main liquid chamber 20 and the sub liquid chamber 21 is provided in the upper portion of the engine mount 3, the injection work can be performed very easily. it can.

(4) Set the yoke 37 of the voice coil 39 to 2
Since it is supported by one damper 36, the yoke 37 and the first
The cylindrical portion 31a of the magnetic body 31 can be maintained in a high degree of coaxiality, and the air gap between the second magnetic body 34 and the movable coil 38 can be further reduced to improve efficiency.

(5) Since the central portion of the diaphragm 15 is sandwiched between the mounting portion 37a of the yoke 37 and the mounting portion 41a of the movable plate 41, the diaphragm 15 is always moved by the vibration of the movable plate 41. And the volume in the sub liquid chamber 21 is forcibly changed by bending in the same direction. Therefore, it is possible to more reliably prevent the vibration of the movable plate 41 from being hindered by the incompressible fluid inside, as compared with the case where the volume change in the sub liquid chamber 21 is allowed by using only the elastic force of the diaphragm 15. can do.

(6) Since the anti-phase control is executed during the steady operation and the in-phase control is executed during the transient operation according to the operating condition of the engine 2, the vibration isolation of the engine 2 similar to the mounting device described in the prior art is performed. Not only the advantage but also the advantage of suppressing the engine shake can be obtained.

(7) Paying attention to the fact that the amplitude of the vibration acceleration g is reduced as the engine speed N is increased, and the amplitude W of the drive current i of the voice coil 39 is controlled to be continuously reduced accordingly. is doing. That is, since the lift amount 1 of the movable plate 41 is finely controlled according to the actual bending amount of the elastic body 18b of the engine mount 3, the dynamic spring constant can be controlled more accurately, and in the high rotation range. Power consumption can be reduced by reducing the amplitude W of the drive current i. Also,
In this way, it can be implemented by a simple control that only changes the amplitude W of the drive current i.

(8) In the low frequency range where the vibration acceleration g is 40 Hz or less, the vibration damping action of the movable plate 41 is supplemented by using the orifice 23 together, so that the lift amount 1 of the movable plate 41 (the drive current i It is not necessary to increase the amplitude W) so much, and the power consumption of the voice coil 39 in the low frequency range can be significantly reduced. In addition, the movable plate 4
Since a large lift amount 1 is not required for 1, the stroke of the voice coil 39 can be reduced to further reduce the size, and the durability can be improved.

[Second Embodiment] A second embodiment of the present invention will be described below. The mounting device of the present embodiment is partially different from the mounting device of the first embodiment in the structure of the engine mount 3, and the other structures are the same. Therefore, the difference will be mainly described.

FIG. 8 is a sectional view showing details of the engine mount in the mounting device for a power unit according to the second embodiment of the present invention.

As shown in the figure, a stopper portion 101 is projectingly provided at the center of the upper surface of the cylindrical portion 31a of the first magnetic body 31.
A cushion material 103 made of rubber is bonded onto the stopper portion 101. Further, the stopper portion 102 is provided at the center of the lower surface of the yoke 37 so as to face the stopper portion 101.
Between the stopper portions 101 and 102, the stopper portions 101 and 102 do not come into contact with each other when the yoke 37 is displaced to the lowermost position (when the lift amount 1 reaches the maximum downward). The interval T of is formed.

When the voice coil 39 vibrates the movable plate 41 in accordance with the drive current i, the stopper portions 101 and 102 do not come into contact with each other, and like the first embodiment.
The reduction of the vibration transmissibility by the anti-phase control and the suppression of the engine shake by the in-phase control are realized.

Further, when excessive vibration in the compression direction is input to the engine mount 3 due to a great engine shake, the pressure of the main liquid chamber 20 abnormally rises due to the bending of the elastic body 18b, and the driving force of the voice coil 39 is increased. The movable plate 41 is forcibly pressed downward by the exceeded force. At this time, since the stopper portions 101 and 102 come into contact with each other to restrict the downward movement of the yoke 37, troubles such as damage of the damper 36 can be avoided in advance. Therefore, in this embodiment, in addition to the various advantages described in the first embodiment, the reliability of the voice coil 39, and thus the reliability of the entire mounting device, can be improved.

The cushion material 103 serves to absorb the impact when the stopper portions 101 and 102 are in contact with each other, and may be made of rubber as described above, or may be a disc spring or the like.

[Third Embodiment] A third embodiment of the present invention will be described below. The mounting device of the present embodiment is partially different from the mounting device of the first embodiment in the structure of the engine mount 3, and the other structures are the same. Therefore, the difference will be mainly described.

FIG. 9 is a sectional view showing details of an engine mount in a mounting device for a power unit according to a third embodiment of the present invention.

As shown in the figure, the yoke 201 of the voice coil 39 is in the shape of a bottomed cylinder that opens downward, and, like the first embodiment, the movable coil 202 provided therebelow.
Is located between the outer periphery of the cylindrical portion 31a of the first magnetic body 31 and the inner periphery of the second magnetic body 34, and the movable plate 41 is connected to the mounting portion 201a formed on the upper portion. There is. A guide rod 203 is projectingly provided at the center of the lower surface of the yoke 201, and the guide rod 203 is movably inserted along the axis L into a guide hole 204 formed in the cylindrical portion 31a of the first magnetic body 31. Has been done. Between the lower surface of the yoke 201 and the upper surface of the cylindrical portion 31a, a rubber damper 205 having a ring shape and an S-shaped cross section is arranged so as to surround the guide rod 203, and the upper and lower sides of the damper 205 are on the yoke 201 side. And the cylindrical portion 31a side, respectively.

The cylindrical portion 31a of the first magnetic body 31 has a screw hole 206 into which the bolt 13 for fixing to the vehicle body 1 side is screwed.
Air vent hole 20 for communicating the inside with the inside of the damper 205
7a is formed, and the guide rod 2 of the yoke 201 is formed.
03 is formed with air vent holes 207b and 207c for communicating the inside of the screw hole 206 with the inside of the air chamber 22, and the inside of the damper 205 and the inside of the air chamber 22 are communicated with each other through these air vent holes 207a to 207c. ing.

When the drive current i is applied to the movable coil 202, the yoke 201 is guided along the axis L while sliding the guide rod 203 into the guide hole 204 of the first magnetic body 31. By vibrating the movable plate 41, the vibration transmissibility is reduced by the anti-phase control and the engine shake is suppressed by the in-phase control, as in the first embodiment. That is, in this embodiment, the damper 36 made of the non-woven fabric of the first embodiment is used.
Instead of this, the yoke 201 is guided by the guide rod 203 and the guide hole 204. Therefore, similarly to the first embodiment, the yoke 201 and the cylindrical portion 3 of the first magnetic body 31.
1a can be maintained at a high degree of coaxiality, and the air gap between the second magnetic body 34 and the movable coil 202 can be further reduced to improve efficiency.

When the yoke 201 vibrates, air flows between the damper 205 and the air chamber 22 through the air vent holes 207a to 207c, and the damper 2 is hermetically closed.
The excess air in 05 is discharged and the insufficient air is introduced.

By the way, in the above embodiment, the vibration damping action of the movable plate 41 was compensated by using the orifice 23 together in the low frequency region of 40 Hz or less, but the present invention is not limited to this. For example, the orifice 23 is omitted and the movable plate 4 is used even in a low frequency range.
The damping action may be obtained only by the reverse phase control of 1. Alternatively, conversely, the driving of the voice coil 39 may be stopped in the low frequency range of 40 Hz or less, and the damping action may be obtained only by the orifice 23.

[0068]

As described above, according to the mounting device for a power unit of the present invention, the distance between the movable member and the communication hole is narrowed and the viscous action of the incompressible fluid is utilized to make the main liquid chamber and the sub liquid chamber. Since the liquid-tightness between the chamber and the chamber is ensured, no member for maintaining the liquid-tightness is required. Therefore, there is no fear that the member for maintaining the liquid-tightness will hinder the vibration of the movable member, the vibration is smoothly transmitted from the movable member to the incompressible fluid in the main liquid chamber, and the dynamic spring constant is always kept accurate. Can be controlled. Further, since the influence of the member for maintaining the liquid-tightness does not affect the actuator, the efficiency of the actuator can be improved and the actuator can be miniaturized.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a mounting device for a power unit that is a first embodiment of the present invention.

FIG. 2 is a sectional view showing details of an engine mount in a mounting device for a power unit according to a first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an ECU of a mounting device for a power unit which is a first embodiment of the present invention.

FIG. 4 is a time chart showing signal waveforms handled by the ECU of the mounting device for the power unit according to the first embodiment of the present invention.

FIG. 5 is a characteristic diagram showing a relationship between a vibration acceleration and a control signal in the mounting device of the power unit according to the first embodiment of the present invention.

FIG. 6 is a characteristic diagram showing the relationship between the drive current and the lift amount of the movable plate in the mounting device for the power unit according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing the processing of the CPU in the mounting device of the power unit according to the first embodiment of the present invention.

FIG. 8 is a sectional view showing details of an engine mount in a mounting device for a power unit according to a second embodiment of the present invention.

FIG. 9 is a sectional view showing details of an engine mount in a mounting device for a power unit according to a third embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a conventional mounting device for a power unit.

[Explanation of symbols]

 1 Car Body 2 Engine (Power Unit) 16 Lower Partition 17 Upper Partition 20 Main Liquid Chamber 21 Sub Liquid Chamber 39 Voice Coil (Actuator) 40 Communication Hole 41 Movable Plate (Movable Member)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akuji Mizutani 1-chome, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor Toshiaki Aki 1-3-3 Ginza, Chuo-ku, Tokyo Kyo Inside San Denki Co., Ltd.

Claims (1)

[Claims] 1. A main liquid chamber, which is disposed between a vehicle body and a power unit, is filled with an incompressible fluid and whose volume is changed by input vibration from the power unit, and the main liquid chamber is provided on one side of the main liquid chamber. In a mounting device of a power unit in which a movable member arranged is vibrated by an actuator in conjunction with the input vibration to change a spring constant, a non-compressible fluid is provided adjacent to the main liquid chamber via a partition wall. And a sub liquid chamber whose volume is allowed to change and the partition wall is formed so as to connect the main liquid chamber and the sub liquid chamber, and the movable member is provided inside the main liquid chamber and the sub liquid chamber. A mounting device for a power unit, comprising: a communication hole that is capable of vibrating in a direction connecting to the sub liquid chamber, and that is provided with a communication hole that is arranged in a state in which a minute gap is formed between the movable member and the outer periphery of the movable member.