JPH05272573A - Power unit mounting device - Google Patents

Abstract

PURPOSE:To sharply change the characteristic of a mounting device having variable vibration-proof characteristic. CONSTITUTION:The second rubber member 14 is provided below the vibration exciter 13 of a power unit mounting device 1 having variable vibration-proof characteristic. A switching actuator 17 lifting or lowering the vibration exciter 13 is provided. The vibration exciter 13 is held at the lifted position separated from the second rubber member 14 during the idle state or the high-rotation state or when the vibration exciter 13 fails, and the power unit mounting device 1 is operated as a liquid-sealed mount. When it is operated as an active mount, the vibration exciter 13 is held and excited at the lowered position (level of a chain line M) where its moving plate presses the rubber member 14. When the roll displacement of an engine is the preset quantity or above, the vibration exciter 13 is held at the pressure position (level of a chain line N) where its moving plate strongly presses the rubber member 14 to suppress the roll.

Description

Detailed Description of the Invention [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit mount device for elastically supporting a power unit of a vehicle and having a variable anti-vibration characteristic, and more particularly to a power unit mount device which can be switched between a state in which a vibration exciter is operated and a state in which it is not operated.

[0002]

2. Description of the Related Art Conventionally, a rubber mount has been generally used as an engine mount device for elastically supporting a power unit of a vehicle on a vehicle body. 62-2
As disclosed in Japanese Patent No. 887441 and Japanese Utility Model Application Laid-Open No. 63-152042, an active that can control a damping force variably by adding a vibrating force to an enclosed liquid by controlling an electrically driven vibration exciter. Various engine mount devices have been proposed and put into practical use.

In the above liquid vibrating active mount device, a main chamber and a sub chamber filled with an incompressible fluid, an orifice communicating between the two chambers, and a partition between the main chamber and the sub chamber are usually provided. A vibration plate is provided that electrically drives a movable plate or a movable film that can move a minute distance in the vibration transmission direction. With respect to low frequency vibration, the vibration is reduced by the damping action of the orifice, With respect to the medium and high frequency vibrations in which the orifice does not function, the vibrator is driven to generate the hydraulic pressure that absorbs or reduces the vibration. On the other hand, there is also proposed a direct vibration type active mount device provided with an actuator for directly applying a vibration force to the vehicle body.

[0004]

In the conventional liquid vibration type active mount device, it is possible to operate as a simple liquid ring mount device by stopping the drive of the vibration exciter. There is a problem that it is not configured so that the characteristics can be changed significantly. Further, in the direct vibration type active mount device, since the actuator is rigidly interposed between the engine bracket and the vehicle body, the orifice effect cannot be obtained against vibration in a low frequency region such as when a shake occurs. There's a problem. Furthermore, since the conventional active mount device does not take measures against a failure of the vibration exciter, there is a possibility that abnormal vibration control is executed when the vibration exciter fails. It is an object of the present invention to provide a power unit mounting device whose characteristics can be changed significantly.

[0005]

According to a first aspect of the present invention, there is provided a power unit mount device according to claim 1, wherein a mount device having a variable vibration damping characteristic is provided between a power unit of a vehicle and a vehicle body. An orifice that connects the main chamber and the sub chamber, a rubber member that partitions the boundary between the main chamber and the sub chamber, a vibrating device that generates a vibrating force in the vibration direction of the input vibration, and the main chamber And a rubber member for transmitting an exciting force for transmitting the vibration of the exciter, and the vibrating output section of the rubber member for transmitting the vibration to the vibrating force transmitting rubber member. The present invention is provided with a switching drive means capable of selectively switching between a vibration position in pressure contact and a separation position in which the vibration output portion is separated from the vibration force transmitting rubber member.

According to a second aspect of the present invention, there is provided a power unit mounting apparatus according to the first aspect, wherein a failure detecting means for detecting a failure of the vibration exciter and an error detecting means for detecting a failure of the vibration exciter are added. And a control means for controlling the switching drive means so as to switch the shaker to the separated position. According to a third aspect of the present invention, there is provided the power unit mounting apparatus according to the first aspect, further comprising control means for controlling the switching drive means so as to switch the vibration exciter to a separated position when the engine is in an idle state. The power unit mounting device according to claim 4 is the device according to claim 1,
The control means controls the switching drive means so as to switch the vibration exciter to the separated position when the engine is in a high rotation state. A power unit mount device according to a fifth aspect is the device according to the first aspect, in which control is provided to control the switching drive means so as to switch the vibration exciter to a crimping position among the vibration exciting positions when the roll displacement of the engine is equal to or more than a predetermined amount. It is equipped with means.

[0007]

In the mount device according to the first aspect of the present invention, the exciter is operated in a state in which the exciter is switched to the exciter position where the exciter output portion is in pressure contact with the exciter force transmitting rubber member by the switching drive means. Then, the vibration force from the vibration exciter is transmitted to the vehicle body side through the vibration force transmission rubber member as in the case of the direct vibration type active mount device. When the vibration output unit is switched to the separated position separated from the vibration force transmitting rubber member, the same function as a normal liquid ring mount device can be obtained.

According to another aspect of the mount device of the present invention, the control means comprises: when the failure detection means detects a failure of the vibration exciter,
Since the switching drive means is controlled so as to switch the vibration exciter to the separated position, it is possible to eliminate the abnormal operation at the time of failure of the vibration exciter and achieve fail-safe. In the mounting apparatus according to claim 3, the control means controls the switching drive means so as to switch the vibration exciter to the separated position when the engine is in an idle state, and therefore, like the normal liquid-ring mounting apparatus, the control of the orifice is performed. The damping action can reduce low-frequency vibration. In the mounting device according to claim 4,
The control means controls the switching drive means so as to switch the vibration exciter to the separated position when the engine is in a high rotation state, so that the vibrator is switched to the separated position when a particularly high high-frequency vibration that the vibrator cannot follow. be able to. Claim 4
In the mounting device, the control means controls the switching drive means so as to switch the vibration exciter to the crimping position among the vibration exciting positions when the engine roll displacement is equal to or more than a predetermined amount. Can be suppressed.

[0009]

According to the power unit mounting apparatus of the first aspect, the vibrating machine, the vibrating force transmitting rubber member, and the switching drive means are provided, so that the vibrating machine is held at the vibrating position. At times, the function as a direct vibration type active mount device can be achieved, and when the vibrator is held at the separated position, the function as a normal liquid ring mount device can be achieved. In this way, it becomes possible to greatly change the characteristics of the mounting device. Moreover, since the vibration force of the vibration exciter is transmitted through the rubber member for the vibration force transmission unit, the vibration can be absorbed by the vibration absorbing action of the rubber member for the vibration force transmission unit in the medium and high frequency range, and the vibration is generated. The responsiveness and tracking of the machine can be improved.

According to the power unit mount device of the second aspect, since the failure detection means and the control means are provided, the vibrating machine is held at the separated position when the vibrating machine fails, and the abnormal operation of the vibrating machine is eliminated. However, fail-safe can be achieved. According to the power unit mount device of the third aspect, since the control means is provided, the vibration exciter is held in the separated position when the engine is in the idle state, and the damping action of the orifice is performed similarly to the normal liquid ring mount device. This makes it possible to reduce low-frequency vibration. According to the power unit mount device of the fourth aspect, since the control means is provided, the vibrator can be switched to the separated position when a particularly high high-frequency vibration that the vibrator cannot follow. According to the power unit mount device of claim 5, the control means is provided, and when the roll displacement of the engine is equal to or more than a predetermined amount, the vibration exciter is switched to the crimping position among the vibration exciting positions, thereby suppressing the rolling of the engine. You can do it.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example in which the present invention is applied to a power unit mount device provided between a power unit side bracket and a vehicle body for elastically supporting a power unit of an automobile on the vehicle body. As shown in FIG. 1, the power unit mounting device 1 is mounted between a power unit side bracket B and a suspension cross member C belonging to a vehicle body frame or a vehicle body. In this power unit mounting device 1, a body case 2 made of a metal having a bottomed cylindrical shape, and an upper case 3 made of a rubber film which is fixed to the upper end of the body case 2 at the lower end and covers the upper side of the body case 2. The main chamber 5 and the sub-chamber 6 are defined by the metallic circular and block-shaped input member 4 which is fixed to the upper wall of the upper case 3 through the central portion thereof.

A space between the main chamber 5 and the sub chamber 6 is partitioned by a first rubber member 7 which is annular and has a tapered tubular shape and which is thick. A tubular portion 8a and this tubular portion are provided slightly inside the outer peripheral portion of the main body case 2. A partition member 8 including a tapered portion 8b extending from the upper end of 8a and an upper wall portion 8c extending from the tapered portion 8b is provided in the main body case 2
The main chamber 5 is divided into a main main chamber 5a and an auxiliary main chamber 5b by the partition member 8, and the main chamber 5 and the sub chamber 6 are separated from each other.
The inside is filled with an incompressible fluid (for example, silicone oil, water, alkylene glycol, etc.). The cylindrical portion 8a of the partition member 8 is formed with a first orifice 9 having a small diameter hole, and the upper wall portion 8c of the partition member 8 is provided with a second orifice 10 having a small diameter hole. The main main chamber 5a and the auxiliary main chamber 5b communicate with each other, and the second main orifice 10 connects the auxiliary main chamber 5b and the sub chamber 6 with each other.

The upper end surface of the input member 4 is in surface-contact with the lower surface of the power unit side bracket B, and the bolt 11 erected on the upper end of the input member 4 is inserted into the bracket 1 and the nut 11 is attached to the bolt 11. The upper end of the power unit mounting device 1 is fixed to the bracket B by screwing. The upper end of the first rubber member 7 is liquid-tightly fixed to the input member 4 by adhesion.
The lower end of the rubber member 7 is fixed to the tapered portion 8b of the partition member 8 by liquid-tight bonding.

A circular recess 4a facing the upper end of the main main chamber 5a is formed at the lower end of the input member 4, a vibrator 13 is provided in the recess 4a, and the main main chamber 5 is also provided.
A columnar second rubber member 14 (corresponding to a rubber member for transmitting an exciting force) having a diameter of about ⅓ of the diameter of the main body case 2 is arranged in the a in coaxial with the exciter 13 and in series. It is set up. The upper end surface 14 a of the second rubber member 14 has a recess 4
The circular plate 14b made of metal is fixed to the lower end of the second rubber member 14 near the lower end of the second rubber member 14, and the bolt 15 fixed to the central portion of the circular plate 14b at the lower end is the main body case 2
And the suspension cross member C through which the nut 16 extends to the main body case 2 and the cross member C.
It is fixed to and. The spring constant of the second rubber member 14 is set to be larger than the spring constant of the first rubber member 7.

A switching actuator 17 (corresponding to switching driving means) for driving the vibrator 13 up and down by a predetermined small stroke is provided at the center of the upper surface of the input member 4. The bracket B is inserted and protrudes upward. The shaker 13
Is a coil holder 18 that is vertically slidably mounted in the recess 4a, an annular solenoid coil 19 that is mounted on the outer peripheral portion of the coil holder 18 on the lower surface side, and the solenoid coil 1
9 is a disc 20 made of a magnetic material, which is mounted inside 9, a soft rubber plate 21 fixed to the lower surfaces of the coil holder 18, the solenoid coil 19, and the disc 20, and a lower surface of the rubber plate 21. The movable plate 22 is made of a magnetic material (corresponding to the vibration output unit) and is opposed to the upper end of the second rubber member 14, and the solenoid coil 19 is supplied from the control device 30. It is driven by drive current.

In the state where the solenoid coil 19 is energized, the movable plate 22 is attracted by the magnetic force of the solenoid coil 19 and the rubber plate 21 is elastically deformed to move up a short stroke, and when the solenoid coil 19 is de-energized, Since the movable plate 22 is returned downward by the elastic restoring force of the rubber plate 21, the movable plate 22 can be vibrated vertically by repeating energization and deenergization of the solenoid coil 19. .. However, a spring member may be provided instead of the rubber plate 21, or a movable member made of a permanent magnet may be used instead of the disc 20 and the rubber plate 21, for example, the upper end side is the N pole and the lower end side is the S pole. The movable member may be provided.

The switching drive actuator 17 includes:
A cap-shaped coil case 23 fixed to the upper end of the input member 4, a solenoid coil 24 mounted in the coil case 23, a central hole of the solenoid coil 24, and a through hole of the input member 4 are inserted through the lower end portion. In the output rod 25 fixed to the coil holder 18, the output rod 25 is made of a permanent magnet and has, for example, an N pole at the upper end and an S pole at the lower end,
The solenoid coil 24 is mounted on the upper end of the central hole and elastically biases the output rod 25 downward. The solenoid coil 24 is driven by a drive current supplied from the control device 30.

When the solenoid coil 24 is energized to generate an upward magnetic field, as shown in FIG.
When the output rod 25 rises and the vibration exciter 13 is fitted into the recess 4a, the movable plate 22 is held at a position separated from the upper end of the second rubber member 14, and when the solenoid coil 24 is de-energized. The output rod 25 is lowered by the urging force of the coil spring 26, and the movable plate 22 is brought into a lowered position (first vibration position) where it is pressed against the upper end of the second rubber member 14 with a predetermined first pressing force. When a current in the opposite direction to the above is supplied to the coil 24 to generate a downward magnetic field, the output rod 25 descends due to the urging force of the coil spring 26 and its magnetic force, and the movable plate 22 moves to the second rubber member 14. The upper end is configured to be at a crimping position (second vibrating position) for crimping with a predetermined second pressing force larger than the first pressing force.

In FIG. 2, the solid line L is the upper end position of the second rubber member 14 when the second rubber member 14 is in a natural state, the alternate long and short dash line M is the lower surface position of the movable plate 22 when it is in the lowered position, and The dotted line N is the lower surface position of the movable plate 22 at the crimping position. Further, a roll switch 27 facing the lower surface of the bracket B is fixed to the main body case 2 of the mount device 1 via a mounting member 28.
7 is configured to be turned on when the roll displacement of the power unit is equal to or larger than a predetermined amount, and the detection signal from the roll switch 27 is supplied to the control device 30. Further, in the main main chamber 5a, on the side portion of the second rubber member 14,
A pressure sensor 29 composed of a piezoelectric element is provided, and the detection signal thereof is supplied to the control device 30.

A control system for driving the actuator 13 of the power unit mounting apparatus 1 will be described. As shown in FIG. 3, the control device 30 includes a control waveform generator 31, a control calculator 32, and a phase / gain adjuster 33.
And a drive circuit 34 for the vibrator 13 and a drive circuit 35 for the switching actuator 17.
The control waveform generation unit 31 receives the rotation speed signal from the engine rotation speed sensor, and generates a control waveform corresponding to the rotation speed for absorbing vibration transmitted from the power unit. The control calculation unit 32 includes a rotation speed signal from an engine rotation speed sensor, a detection vibration signal from a vibration sensor that detects vibration and / or noise at a control point of the vehicle body (for example, a predetermined measurement point in the vehicle interior), The vibration transmitted from the power unit on the basis of the rotation speed signal and the detected vibration signal when receiving the detection signal from the engine idle switch, the detection signal from the roll switch 27, and the detection signal from the pressure sensor 29. The phase and gain of the control waveform generated by the control waveform generation unit 31 are calculated so as to absorb or attenuate.

The phase / gain adjusting section 33 determines the phase and gain of the control waveform based on the control waveform signal supplied from the control waveform generating section 31 and the phase / gain setting signal supplied from the control calculating section 32. Adjust. The drive circuit 34
Is the solenoid coil 19 of the vibration exciter 13 that supplies the drive current corresponding to the control signal output from the phase / gain adjustment unit 33.
Then, the drive circuit 35 outputs the drive current corresponding to the control signal output from the control calculation unit 32 to the solenoid coil 24 of the switching actuator 17.

Specifically, the control device 30 is composed of an input interface, a microcomputer, an output interface, a drive circuit, etc., and a control program for vibration absorption control is stored in advance in the ROM of the microcomputer. .. The outline of this vibration absorption control will be described with reference to the flowchart of FIG. 4, and the reference symbols Si (i = 1, 2, 3, ...) In the figure represent the respective steps.
When the control is started when the power unit is started, S
In 1, the rotation speed signal from the engine rotation speed sensor is read, and then in S2, a calculation processing for obtaining a control waveform corresponding to the engine rotation speed and for absorbing the vibration transmitted from the power unit is executed. It

Regarding this control waveform, the waveform of the vibration generated from the power unit is different for each engine speed, and the control program includes engine speeds of 500 rpm or more (500, 1000, 1500, 2000, ...). ) (Rpm)
The vibration waveform pattern of medium and high frequencies at the time of is input and stored in advance, and the control waveform is calculated by complementing the detected engine speed from this vibration waveform pattern. Next, in S3, the detected vibration signal from the vibration sensor that detects the vibration and / or noise at the control point of the vehicle body is read, and then in S4, the phase of the control waveform is adjusted so as to absorb or attenuate the vibration transmitted from the power unit. Phase / gain adjustment processing for adjusting the gain and the gain is executed.

Next, in S5, a control signal for controlling the vibrator 13 to the lowered position is output to the drive circuit 35 of the switching actuator 17, and then, in S6, the phase / gain adjustment process is performed. The control signal for generating the vibration of the control waveform is output to the drive circuit 24 for the vibration exciter 13 to drive the vibration exciter 13, and then the control returns to S1 and the control after S1 is performed for a predetermined minute time. It will be repeated every time.

Next, three interrupt processing routines executed by interrupt processing at every predetermined minute time during execution of the main routine will be described with reference to FIGS.
First, FIG. 5 is a routine for holding the vibration exciter 13 in the raised position when the engine is in the idle state. After the start of the interrupt process, it is determined in S10 whether the engine is in the idle state or not. If the signal is OFF and the signal is not in the idle state, the vibration exciter 13 is held at the lowered position in S11. In this case, a control signal for cutting off the energization of the solenoid coil 24 of the switching actuator 17 is output to the drive circuit 25, and the vibration exciter 13 is held at the lowered position (first vibration position). On the other hand, when the engine is in the idle state, S12
The drive current for generating the upward magnetic field is supplied to the solenoid coil 24 to switch the vibration exciter 13 to the raised position.
By shutting off the energization of the solenoid coil 19 of the above, the vibration exciter 13 is held OFF, and S11 or S13
To return to the main routine.

Next, FIG. 6 shows a routine for keeping the vibrator 13 in the raised position and avoiding erroneous vibration control when the vibrator 13 breaks down. S
At 20, it is determined whether the vibration exciter 13 is out of order. This determination is based on the detection signal from the pressure sensor 29 and the drive circuit 34 when the vibrator 13 is in the lowered position or the crimping position.
It is performed by determining whether the hydraulic pressure detected by the pressure sensor 29 corresponds to the control signal to the drive circuit 34 based on the control signal to the drive circuit 34. However, the determination may be made by monitoring the current value or voltage value of a predetermined circuit portion in the drive circuit 34. When the shaker 13 is not in failure, the shaker 13 may be operated. Therefore, by cutting off the power supply to the solenoid coil 24 in S21, the shaker 13 is switched to the lowered position, and When the shaker 13 is out of order, S22
At, by supplying a drive current for generating an upward magnetic field to the solenoid coil 24, the vibration exciter 13 is switched to the raised position, and the process returns to the main routine after S21 or S22.

Next, FIG. 7 shows control for suppressing the roll of the power unit by strongly crimping the vibration exciter 13 to the second rubber member 14 when the roll displacement of the power unit is a predetermined amount or more. After starting interrupt processing, S
At 30, it is determined whether or not the roll switch 27 is ON, the process proceeds to S31 when it is OFF, it is determined whether the roll flag RF is set, and the process proceeds to S32 when the roll flag RF is not set. ,
By cutting off the power supply to the solenoid coil 24,
The vibration exciter 13 is held at the lowered position (first vibration position), and then returns to the main routine. When the roll flag RF is in the set state as a result of the determination in S31, S31
To S35.

On the other hand, when the roll displacement of the power unit exceeds a predetermined amount and the roll switch 27 is turned on,
The process proceeds from S31 to S33, the roll flag RF is set in S33, then the timer T (whose count value is T) is started in S34, and then S35.
At, the vibrator 13 is moved down to the pressure-bonding position (second vibration position). In this case, the solenoid coil 24 is supplied with a drive current for generating a predetermined downward magnetic field. next,
In S36, it is determined whether or not the count value of the timer T is equal to or greater than the predetermined time T0, and initially it is determined as No, and S
After returning to the main routine after 35, when the roll displacement of the power unit is large and the roll switch 27 is repeatedly turned on, S30, S33, and S34 to S36 are repeated.

After the roll switch 27 is turned off, the process proceeds from S30 to S31, and it is determined in S31 whether the roll flag RF is in the set state.
35, the process proceeds to S36 and repeats this for a predetermined time T
When 0 has passed, the determination in S36 becomes Yes, and S37
Then, after the roll flag RF is reset in S37, the process returns to the main routine. That is, the vibration exciter 13 is held at the crimping position for a predetermined time T0 not only while the roll displacement of the power unit is large but also after the roll switch 27 is switched off. When the vibration exciter 13 is held at the crimping position, the spring constant of the mounting device 1 increases, so that the roll of the power unit is suppressed.

However, instead of the roll switch 27, a roll displacement sensor for detecting the roll displacement may be provided.
Further, when the rate of change of the accelerator opening or the throttle opening is a predetermined value or more based on a detection signal from a sensor that detects the accelerator opening or the throttle opening of the automobile, the roll displacement is a predetermined amount or more. Alternatively, the vibration exciter 13 may be configured to be held at the crimping position, or the roll displacement may be a predetermined amount or more when the rate of change of the braking state by the foot brake or the engine brake is a predetermined value or more. Alternatively, the vibration exciter 13 may be held at the crimping position. Further, although the flowchart is omitted, in the fourth interrupt processing routine, it is determined whether or not the engine is in a high rotation speed of a predetermined rotation speed or more based on the engine rotation speed signal, and the engine is in a high rotation speed of a predetermined rotation speed or more. When in the rotating state, by supplying a drive current for generating an upward magnetic field to the solenoid coil 24, the vibration exciter 13 is switched to the raised position.

Hereinafter, the power unit mounting device 1 will be described.
The action of will be described. The power unit mounting apparatus 1 has a first mode in which the vibration exciter 13 is held in the raised position and operates as a normal liquid ring mount, and a normal direct vibration type active mode in which the vibrator 13 is held in the lowered position. It is possible to operate in a selected mode of the second mode in which the power unit is operated as a mount and the third mode in which the vibrator 13 is held in the crimping position to suppress the roll of the power unit. First, when the engine is in the idle state, it is possible to set the first mode and operate it as a liquid ring mount to damp the vehicle body vibration due to the vibration from the power unit. However, it is of course possible to operate in the first mode even in an operating state where the engine speed is low other than the idle state.

In this case, the frequency of the vibration of each order component among the vibration components of various orders included in the vibration generated from the power unit increases as the engine speed increases. In this mount device 1, the vibration exciter 13 is operated mainly to reduce the secondary component of the engine vibration. When the frequency of the secondary component is low and it is about 0 to 30 Hz, the main chamber 5 and the sub chamber are separated from each other. Since the fluid in the chamber 6 sufficiently follows, the first and second orifices 9 and 10 function effectively, and the vibration is significantly damped. Here, when the vibration exciter 13 fails, it is possible to prevent erroneous vibration control by operating in the first mode.

Next, when the vibration of the vehicle body control point is to be suppressed in an operating state in which the engine speed is high to some extent,
By operating in the second mode, vibration can be absorbed or reduced. That is, the frequency of the secondary component is about 30 to
At a medium and high frequency of 200 Hz, the fluid cannot follow and the damping action of the first and second orifices 9 and 10 cannot be obtained. Therefore, vibration is reduced through the vibration exciter 13. In this mount device 1, the vibration generated by the vibration exciter 13 is transmitted to the vehicle body via the second rubber member 14. In this case, since the engine vibration is transmitted to the second rubber member 14 via the vibration exciter 13, the second rubber member 14 can effectively absorb the vibration.

Then, the vibration generated by the vibration exciter 13 is
By transmitting the vibration to the vehicle body through the second rubber member 14 having an elastic restoring force, the responsiveness or the followability of the vibration exciter 13 is enhanced. When a medium-high frequency vibration force is applied, the vibration transmission force of the mount device 1 decreases as the spring constant of the second rubber member 14 increases. Therefore, it is desirable to set the spring constant of the second rubber member 14 to a certain degree. Next, when the roll of the power unit becomes violent and the roll displacement exceeds a predetermined amount,
Rolling can be suppressed by operating the third mode. That is, when the vibrator 13 is held at the crimping position (first vibration position), the elastic compression amount of the second rubber member 14 increases, so that the spring constant of the mounting device 1 increases.
Roll will be suppressed. On the other hand, when the engine is in the high rotation state above a predetermined level, the vibrator 13 is held in the raised position in view of the fact that the vibrator 13 cannot follow the engine.

As described above, the mount device 1 is provided by providing the vibration exciter 13 and the switching actuator 17 and switching the operation modes of the vibrator 13 to the above-mentioned three ways.
The characteristics of can be changed significantly. The mount device is controlled by controlling the magnitude of the drive current supplied to the solenoid coil 24, which is a drive current for generating a magnetic field in the direction of pressing the vibrator 13 against the second rubber member 14, in a plurality of steps. It is also possible to switch the spring constant of 1 in multiple stages, and the coil spring 26 may be omitted if necessary. In addition, in the mount device 1, the vibrator 1
The actuator of No. 3 is not limited to the solenoid type actuator, but it is also possible to apply a piezo element actuator, a magnetostrictive element actuator, or the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a power unit mounting apparatus according to an embodiment at a raised position.

FIG. 2 is a cross-sectional view of the mounting apparatus of FIG. 1 in a lowered position.

FIG. 3 is a configuration diagram of a control system of the mount device in FIG.

4 is a flowchart of a main routine of vibration absorption control of the mount device of FIG.

FIG. 5 is a flowchart of an interrupt processing routine of vibration absorption control of FIG.

6 is a flowchart of an interrupt processing routine of vibration absorption control of FIG.

FIG. 7 is a flowchart of an interrupt processing routine of the vibration absorption control of FIG.

[Explanation of symbols]

 1 Power Unit Mounting Device 5 Main Chamber 6 Sub Chamber 7 First Rubber Member 10 Second Orifice 13 Exciter 14 Second Rubber Member 17 Switching Actuator 18 Movable Plate 19 Solenoid Coil 27 Roll Switch 29 Pressure Sensor 30 Control Device

Claims (5)

[Claims] 1. A mounting device, which is provided between a power unit of a vehicle and a vehicle body and has a variable vibration-damping characteristic, in which a main chamber and a sub-chamber containing an incompressible fluid, and an orifice which connects the main chamber and the sub-chamber to each other. A rubber member for supporting the power unit, a vibration exciter for generating a vibration force in the vibration direction of the input vibration, and a vibration generator which is provided in series in the main chamber in series with the vibration exciter. A vibrating force transmitting rubber member, a vibrating position at which the vibrating output portion of the vibrating machine is in pressure contact with the vibrating force transmitting rubber member, and a vibrating force transmitting rubber member for the vibrating force transmitting portion. A power unit mounting device, comprising: a switching drive means capable of selectively switching to a separated position separated from a member. 2. The power unit mount device according to claim 1, wherein the failure detecting means for detecting a failure of the vibration exciter and the vibration exciter at a separated position when the failure detection means detects a failure of the vibration exciter. A power unit mounting apparatus, comprising: a control unit that controls a switching drive unit so as to switch to a power unit mounting device. 3. The power unit mounting device according to claim 1, further comprising control means for controlling the switching drive means so as to switch the vibration exciter to a separated position when the engine is in an idle state. .. 4. The power unit mount according to claim 1, further comprising control means for controlling the switching drive means so as to switch the vibration exciter to the separated position when the engine is in a high rotation state. apparatus. 5. The power unit mounting apparatus according to claim 1, further comprising a control means for controlling the switching drive means so as to switch the vibration exciter to a pressure-bonding position among the vibration excitation positions when the roll displacement of the engine is equal to or more than a predetermined amount. A power unit mounting device characterized by being provided.