JP3039105B2 - Cylindrical anti-vibration mount, power plant supporting device using the cylindrical anti-vibration mount, and method of controlling cylindrical anti-vibration mount in power plant supporting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration technique which can be advantageously applied to an anti-vibration support structure for a vehicle body of a power plant of an automobile, and more particularly to an anti-vibration characteristic capable of active control of vibration and an input vibration. And a power plant supporting apparatus using the cylindrical vibration isolating mount, and a method for controlling the cylindrical vibration isolating mount in the power plant supporting apparatus.

[0002]

2. Description of the Related Art Conventionally, as a type of a vibration isolating mount that is interposed between a vibration source such as a power plant and a supporting member thereof and supports the vibration source with respect to a supporting member, the vibration sources are radially separated from each other. 2. Description of the Related Art There is known a structure in which an inner cylindrical fitting and an outer cylindrical fitting arranged at a predetermined distance are connected by a rubber elastic body interposed therebetween. For example, in an FF type vehicle, a cylinder type engine mount or the like for supporting a power plant including an internal combustion engine, a transmission, and the like in a vibration-proof manner with respect to a vehicle body is the one.

In recent years, with the sophistication of required vibration isolating characteristics, a fluid chamber in which an incompressible fluid is sealed is provided as such a cylindrical vibration isolating mount, which is caused when vibration is input. Various types of fluid-filled cylindrical anti-vibration mounts and the like that utilize an anti-vibration effect exerted on the basis of the flow action of a fluid have been proposed.

However, these conventional cylindrical anti-vibration mounts are passive vibration control devices that do not require external energy supply, and it is still difficult to obtain a sufficient anti-vibration effect. Since the vibration frequency range where the effective vibration damping effect is exhibited is narrow and its vibration damping characteristics are fixedly determined at the time of design, when the frequency of the input vibration to be damped fluctuates, The effect is remarkably reduced, and it is difficult to obtain an effective anti-vibration effect.

In particular, in a power plant supporting apparatus for an automobile, a high damping characteristic against low frequency vibrations such as a shake and a bounce input in the vertical direction of the vehicle and a low dynamic spring against idling vibration input around the torque roll axis. However, the low-frequency vibrations such as shake and bounce and the idling vibration have different input directions from each other, and the required vibration-proofing properties are in conflict with each other. With a power plant supporting device using an engine mount, it was extremely difficult to obtain a sufficient vibration damping effect against both of these vibrations.

[0006]

The present invention has been made in view of the above circumstances, and an object of the present invention is to achieve active control of vibration and obtain an excellent vibration-proof effect. In addition, the present invention is to provide a cylindrical anti-vibration mount that can appropriately switch the anti-vibration characteristics according to input vibration or the like.
It is also possible to advantageously provide a power plant support device using such a tubular anti-vibration mount and a method of controlling a tubular anti-vibration mount in the power plant support device, which can be advantageously applied to an automobile power plant support device and the like. The solution is to solve the problem.

[0007]

According to the present invention, in order to solve such a problem, an inner cylinder and an outer cylinder which are arranged at a predetermined distance from each other in a radial direction are interposed therebetween. In a cylindrical anti-vibration mount connected by a rubber elastic body, a pair of electrostrictive elements are provided between the inner cylinder and the outer cylinder, and the inner cylinder and the outer cylinder are opposed to each other. By disposing them in parallel so that displacements are generated in substantially different radial directions from each other, and by enabling power supply to the pair of electrostrictive elements to be controlled independently of each other, the power is applied to the pair of electrostrictive elements. And the resultant force based on the displacement of the pair of electrostrictive elements when the applied voltages are in-phase waveforms,
The resultant force based on the displacement of the pair of electrostrictive elements when the waveforms have phases opposite to each other is applied to the inner cylinder and the outer cylinder in directions different from each other. The gist of the present invention is a cylindrical anti-vibration mount.

Further, the present invention uses such a tubular anti-vibration mount, and attaches the inner tubular fitting to either one of the power plant and the supporting member, while attaching the outer tubular fitting to the power plant and the supporting member. A power plant supporting apparatus, which is mounted on one of the other side so that the power plant is vibration-isolated with respect to the supporting member, wherein the pair of electrostrictive elements in the cylindrical vibration isolating mount are The resultant force based on the displacement of the pair of electrostrictive elements when the voltages applied to the pair of electrostrictive elements are positioned opposite to each other across the vertical plane including the torque roll axis of the power plant and have mutually opposite phases. However, the gist of the invention is also applied to the power plant support device, wherein the power plant support device is applied around the torque roll axis to the power plant.

Still further, according to the present invention, in the power plant supporting apparatus, a voltage having a waveform having the same phase and a voltage having a waveform having the opposite phase are applied to the pair of electrostrictive elements in the cylindrical vibration isolation mount. The present invention also provides a method for controlling a cylindrical anti-vibration mount in a power plant support device, wherein the method is applied in such a manner as to be switched according to input vibration.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows an engine mount 10 for an FF type vehicle having a structure according to the present invention. In this figure, reference numeral 12 denotes an inner cylindrical member, and 14 denotes an outer cylindrical member, which are disposed opposite to each other at a predetermined distance in a radial direction, and are elastically arranged by a rubber elastic body 16 interposed therebetween. Are linked together.

In the engine mount 10, the inner cylinder 12 and the outer cylinder 14 are respectively
By being attached to the power plant 18 side and the vehicle body 20 side to be described later, the power plant 18
And the vehicle body 20. Further, at the time of such mounting, the load of the power plant 18 is input to the engine mount 10 in the eccentric direction of the inner and outer cylindrical fittings 12 and 14.

More specifically, the inner cylinder fitting 12 has a cylindrical shape. Further, a metal sleeve 22 having a thin cylindrical shape is disposed outside the inner cylindrical fitting 12 at a predetermined distance in the radial direction and eccentric by a predetermined amount.

A rubber elastic body 16 is interposed between the inner cylindrical fitting 12 and the metal sleeve 22, and the inner cylindrical fitting 12 and the metal sleeve 22 are interposed by the rubber elastic body 16.
Are elastically connected to each other. That is, the rubber elastic body 16 is formed as an integral vulcanized molded product that is vulcanized and bonded to the outer peripheral surface of the inner cylindrical fitting 12 and the inner peripheral surface of the metal sleeve 22.

The rubber elastic body 1
6 is composed of two legs 24, 24 extending from the outer peripheral surface of the inner cylindrical fitting 12 toward the inner peripheral surface of the metal sleeve 22,
It is formed to have a substantially "C" -shaped cross section as a whole, which is substantially symmetric with respect to a radial line extending in the eccentric direction between the inner cylinder fitting 12 and the metal sleeve 22.

As a result, the first space 26 and the second space 26 are located between the inner cylindrical member 12 and the metal sleeve 22 in one radial direction with the inner cylindrical member 12 interposed therebetween. 28
Are provided to penetrate in the axial direction, respectively. The cavities 26 and 28 allow the rubber elastic body 16 due to the load of the power plant exerted when the mount is mounted.
Is prevented as much as possible, and the durability of the rubber elastic body 16 is improved.

Further, stopper portions 30 and 32 projecting at a predetermined height toward the metal sleeve 22 are integrally formed on both sides of the rubber elastic body 16 with the inner cylinder 12 sandwiched in the eccentric direction. Is provided. Further, cushioning rubbers 34 and 36 are provided on the inner peripheral surface of the metal sleeve 22 facing the respective stopper portions 30 and 32, respectively, and are vulcanized and bonded to the metal sleeve 22. The stopper portions 30 and 32 abut against the cushioning rubbers 34 and 36, so that the inner cylindrical metal fitting 12
The relative displacement of the metal sleeve 22 with respect to the metal sleeve 22 can be regulated.

Further, the metal sleeve 22 forming the above-mentioned integrally vulcanized molded product is provided with the legs 24, 24 of the rubber elastic body 16.
A first window portion 38 and a second window portion 40 are provided at a portion where is fixed. The first and second pocket portions 42 and 24 of the rubber elastic body 16 have a circular cross-section and extend a predetermined length from the metal sleeve 22 toward the inner cylinder fitting 12. 44 are provided, and are opened through the first window portion 38 and the second window portion 40 provided in the metal sleeve 22, respectively.

In the first pocket portion 42 and the second pocket portion 44, a first actuator member 46 and a second actuator member 48 are mounted in an inserted state, respectively.

The first and second actuator members 46 and 48 are respectively formed as shown in FIG.
A case 54 having a structure in which an inverted cup-shaped lid metal fitting 52 is inserted into an almost cylindrical bottomed holder metal fitting 50 from an opening side thereof so as to be able to mutually enter and exit in the axial direction. Have. Note that a ring-shaped seal rubber 56 is interposed between the inner peripheral surface of the holder fitting 50 and the outer peripheral face of the lid fitting 52.

An electrostrictive element 58 is accommodated in the case 54. This electrostrictive element 58
A so-called laminated ceramic actuator comprising a plurality of elements made of piezoelectric ceramics having an inverse piezoelectric effect such as barium titanate or PZT so as to obtain an appropriate displacement stroke. One side in the direction is fixedly attached to the bottom plate portion 62 of the holder fitting 50, and the other side is fixedly attached to the bottom plate portion 64 of the lid fitting 52.

A voltage is applied to each laminated element through a lead wire 60 that penetrates through the bottom plate portion of the holder fitting 50 and is guided to the inside, whereby an axial direction is applied to the electrostrictive element 58. Distortion (expansion and contraction) is caused. That is, when the strain of the electrostrictive element 58 is exerted between the holder fitting 50 and the lid fitting 52,
The lid fitting 52 is driven in the axial direction (in / out direction) with respect to the holder fitting 50 to be displaced.

Thus, the first actuator member 46 and the second actuator member 48 having such a structure are respectively placed on the rubber elastic body 16 from the lid fitting 52 side.
Are inserted and arranged in a first pocket portion 42 and a second pocket portion 44 provided in the leg portions 24, 24. Then, the first and second actuator members 46,
48, bottom plate portions 62, 62 of holder fittings 50, 50
Are fitted and held in the first and second windows 38 and 40 provided in the metal sleeve 22.

The first and second pocket portions 42, 4 of the first and second actuator members 46, 48 are provided.
The rubber elastic body 16 can be disposed by being fitted into each of the pockets 42 and 44 after vulcanization molding of the rubber elastic body 16, but the first and second rubber elastic bodies 16 can be disposed in the molding die. By disposing the actuator members 46 and 48 described above, the rubber elastic body 16 may be assembled simultaneously with molding.

Further, on the outer peripheral surface of the metal sleeve 22, a cylindrical outer tube fitting 14 is externally fixed. The outer cylinder 14 supports the back surfaces of the bottom plates 62, 62 of the holders 50, 50 in the first and second actuator members 46, 48, so that the first and second actuators are supported. Member 4
6 and 48 are fixedly attached to the outer tube fitting 14.

That is, thereby, the first actuator member 46 and the second actuator member 48
Is disposed under the embedded state in the legs 24, 24 of the rubber elastic body 16 in a state of extending from the outer tube fitting 14 side toward the inner tube fitting 12 side.

When assembling the first and second actuator members 46 and 48, the elastic force of the rubber elastic body 16 is exerted between the holder fitting 50 and the lid fitting 52 as necessary. , Each electrostrictive element 5
8, a suitable axial preload will be exerted.

Therefore, as described above, by applying a voltage to the electrostrictive elements 58, 58 of each of the actuator members 46, 48 to displace the cover fitting 52, the driving force of each of the actuator members 46, 48 is obtained. Is applied to the space between the inner cylindrical member 12 and the outer cylindrical member 14 via the rubber elastic body 16 in the direction of expansion and contraction displacement of each electrostrictive element 58.

In this case, when the engine mount 10 is mounted, the inner and outer cylinder fittings 12, 1 are mounted.
The rubber elastic body 16 is deformed by the load of the power plant 18 exerted between the four, and the inner and outer cylindrical fittings 12 and 14 are positioned substantially coaxially. Inner and outer cylinder fittings 1
2 and 14 (see FIG. 5).

The first actuator member 4
In each of the electrostrictive elements 58, 58 in the sixth and second actuator members 48, the control of the applied voltage can be performed independently of each other. Therefore, for example, the first and second actuator members 46, 4
8 by applying an in-phase AC voltage to the electrostrictive elements 58, 58,
It is possible to exert an oscillating driving force in the eccentric direction (vertical direction in FIG. 1) on the outer tube fitting 14, or alternatively, to apply an AC voltage of opposite phase to the electrostrictive elements 58, 58. As a result, the inner and outer cylinder fittings 1
Vibration driving force in a direction perpendicular to the axis different from the eccentric directions of 2, 14 can be exerted.

The engine mount 10 having the above-described structure is, for example, an engine mount 66 having the same structure as that shown in FIGS. 3 and 4, or having another structure. And the power plant 1 in cooperation with the engine mount 66 and the like.
8 will be constituted.

Specifically, the engine mount 10
And 66 are located on the vertical plane Z-Z including the torque roll axis L at both ends of the torque roll axis L with respect to the power plant 18 including the transmission 68 and the internal combustion engine 70. In this way, the power plant 18 is mounted between the power plant 18 and the vehicle body 20, thereby forming a power plant support device for supporting the power plant 18 on the vehicle body 20 in a vibration-proof manner.

As shown in FIG. 5, the mounting of the engine mount 10 is performed by connecting the inner cylindrical fitting 12 to the mounting shaft 72 fixed to the power plant 18 side and the outer cylindrical fitting 14 to the vehicle body 20 side. To the brackets 74 fixed to
Conversely, although not shown, the inner cylinder fitting 12 is attached to the vehicle body side, and the outer cylinder fitting 14 is attached to the power plant side, respectively.
In any of them, a pair of electrostrictive elements 58, 58
Are mounted on both sides of the vertical plane including the torque roll axis: L: ZZ (see FIG. 3).

Further, in any of these mounting modes, the mounting center of the one of the inner cylinder fitting 12 and the outer cylinder fitting 14 which is attached to the power plant 18 side: O
, The torque roll axis of the power plant 18: L
But spaced by a predetermined distance in a vertical upward position: position spaced a predetermined distance P ₁ or vertically downward: As through P _2, it is desirable to determine the mount mounting position.

Under such a mounted state, in the engine mount 10, the voltage applied to each of the electrostrictive elements 58, 58 of the first actuator member 46 and the second actuator member 48 is controlled. do it,
By generating vibration that interferes with and cancels the input vibration, active control of the vibration becomes possible. Thus, in the power plant supporting apparatus, it is possible to advantageously obtain vibration isolation characteristics according to the input vibration. You can do it.

More specifically, when a low frequency vibration in the vertical direction such as a shake or a bounce is input, each of the electrostrictive elements 58 of the first actuator member 46 and the second actuator member 48 is input. , 58 are applied with voltages having waveforms in phase with each other, and the inner cylinder fitting 1 of the engine mount 10 is applied.
A displacement is generated between the outer tube fitting 2 and the outer tube fitting 14, which is substantially in opposite phase to the input vibration.

As a result, the same effect as the improvement of the damping characteristic in the power plant supporting device including the engine mount 10 is exerted, and therefore, it is excellent against low frequency vibrations such as shake and bounce. A damping effect can be exerted.

Further, when a middle or high frequency vibration is input in the vertical and vertical directions that may cause a muffled sound or the like, each of the electrostrictive elements 58, 58 of the first actuator member 46 and the second actuator member 48 is applied. In contrast,
By applying voltages having waveforms having the same phase as each other, the inner cylinder fitting 12 and the outer cylinder fitting 1 in the engine mount 10 are applied.
4, a displacement that is substantially in phase with the input vibration is generated.

As a result, the same effect as when the dynamic spring constant is reduced in the power plant supporting device including the engine mount 10 is exerted.
An excellent vibration insulation effect can be exerted against medium to high frequency vibration.

On the other hand, in such a power plant supporting apparatus, a vibration insulating effect is required also for idling vibration caused as rotational vibration around the torque roll axis L of the power plant 18. . Therefore,
When the idling vibration is input, voltages having waveforms having phases opposite to each other are applied to the respective electrostrictive elements 58 of the first actuator member 46 and the second actuator member 48.

That is, by applying voltages having waveforms having phases opposite to each other to the respective electrostrictive elements 58, 58, a torque roll axis: L around the torque roll axis: L is applied to the inner cylinder fitting 12 in the engine mount 10. A displacement having a directional component is generated. Therefore, the displacement including the engine mount 10 is generated by generating a displacement having substantially the same phase as the input idling vibration with respect to the inner cylinder fitting 12. -The same effect as when the dynamic spring constant in the plant support device is reduced can be obtained, so that an excellent vibration insulating effect can be exerted against idling vibration.

In order to more effectively obtain the vibration isolation effect against idling vibration as described above, the direction of expansion and contraction of the electrostrictive elements 58, 58 in the first and second actuator members 46, 48 is determined by adjusting the torque roll shaft. : It is desirable to set the mounting position of the engine mount 10 so as to substantially coincide with the input direction of the idling vibration around L.

The control signal for controlling the voltage applied to the electrostrictive elements 58, 58 in the first and second actuator members 46, 48 detects the vibration of the power plant 18 directly by the vibration sensor. Although it can be obtained based on the detected signal, it can also be obtained based on a signal obtained by detecting the running state of the vehicle and the rotational state of the engine, for example, the vehicle speed and the engine speed.

Furthermore, the frequency of the voltage applied to the electrostrictive elements 58, 58 in the first and second actuator members 46, 48 can be set to an appropriate value in advance. It is also possible to change continuously according to the input vibration frequency.

Therefore, in the engine mount 10 having the above-described structure, the first actuator member 4
By controlling the voltage applied to the electrostrictive elements 58, 58 of the sixth and second actuator members 48, not only the eccentric direction of the inner cylindrical member 12 and the outer cylindrical member 14 but also the eccentric direction can be controlled. The anti-vibration characteristics of input vibrations in the inclined direction can be appropriately adjusted, and active control of vibrations can be performed.

According to the above-described power plant supporting apparatus constituted by using the engine mount 10 as described above, the first and second actuator members 46 and 4 are provided.
By controlling the voltage applied to the electrostrictive elements 58, 58 in accordance with the input vibration in accordance with the input vibration, an excellent anti-vibration effect can be stably achieved with respect to various input vibrations having different input directions and vibration frequencies. You can get it.

In particular, in such a power plant support apparatus, not only the vertical direction but also the vibration damping characteristics in the rotation direction around the torque roll axis can be controlled, so that it is extremely difficult to achieve both in the past. there were,
Both the input directions are different from each other, and the required anti-vibration characteristics are opposite, and both anti-vibration characteristics against low-frequency vibrations such as shake and bounce and idling vibrations can be highly achieved.

Although the embodiments of the present invention have been described above in detail, these are literal examples, and the present invention is not construed as being limited to such specific examples.

For example, the direction in which the electrostrictive elements 58 and 58 are disposed with respect to the inner cylindrical fitting 12 and the outer cylindrical fitting 14 is not limited to the form as in the above-described embodiment.
It is appropriately determined in accordance with the vibration input direction between the second and the outer tube fittings 14 and the like.

It is not always necessary that the electrostrictive element 58 be fixedly supported on either the inner cylindrical member 12 or the outer cylindrical member 14.
As long as a driving force based on the displacement can be exerted between the inner and outer cylindrical fittings 12 and 14, the inner and outer cylindrical fittings 12 and 14 are fixedly supported by any of the inner and outer cylindrical fittings 12 and 14. Instead, they may be buried and arranged.

Further, a fluid chamber in which an incompressible fluid is sealed is formed in the rubber elastic body 16 and the electrostrictive element 5 is formed.
8, the internal pressure of the fluid chamber is changed, so that the driving force based on the displacement of the electrostrictive elements 58, 58 is applied via the fluid pressure to the inner cylinder fitting 12.
It is also possible to apply a force between the outer cylinder fitting 14 and the like.

Further, when the fluid chamber is formed in the rubber elastic body 16 as described above, a fluid passage through which the fluid flows when a vibration is input is provided, and the fluid flowing through the fluid passage is provided. It is also possible to use a vibration isolation effect based on a resonance action or the like in combination.

In addition, in the above embodiment, the present invention is applied to the FF
Although the specific example of what was applied to the engine mount for type automobiles was shown, the present invention can also be applied to various types of cylindrical anti-vibration mounts other than automobiles, such as a differential mount for automobiles. It is.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be implemented in an embodiment,
It goes without saying that all such embodiments are included within the scope of the present invention, without departing from the spirit of the present invention.

[0055]

As is apparent from the above description, in the cylindrical anti-vibration mount having the structure according to the present invention, by controlling the voltage applied to the pair of electrostrictive elements, The anti-vibration characteristics for a plurality of vibrations having different input directions, which are input to the outer cylinder, can be appropriately adjusted, and active control for the vibrations can be performed.

Further, in the power plant supporting apparatus according to the present invention using such a cylindrical anti-vibration mount,
By switching and controlling the frequency and phase of the voltage applied to the pair of electrostrictive elements according to the input vibration, not only the power plant vibration input in the vertical direction,
An excellent vibration damping effect can be obtained even for power plant vibration input around the torque roll axis.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an engine mount as one embodiment of the present invention.

FIG. 2 is a sectional view showing an actuator member used for the engine mount shown in FIG.

FIG. 3 is an explanatory view illustrating a mounting position of the engine mount shown in FIG. 1 with respect to a power plant.

FIG. 4 is an explanatory diagram showing a right side surface in FIG. 3;

FIG. 5 is an explanatory cross-sectional view showing an example of a mounting state of the engine mount shown in FIG. 1 to a power plant.

[Explanation of symbols]

 Reference Signs List 10 engine mount 12 inner cylinder 14 outer cylinder 16 rubber elastic body 18 power plant 20 body 46 first actuator member 48 second actuator member 58 electrostrictive element

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-1-114522 (JP, A) JP-A-2-261940 (JP, A) JP-A-3-193528 (JP, A) JP-A-4- 145241 (JP, A) JP-A-5-87189 (JP, A) JP-A-5-99264 (JP, A) JP-A-5-202977 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 15/02 F16F 15/08 B60K 5/12

Claims (3)

(57) [Claims] 1. A cylindrical anti-vibration mount in which an inner cylinder and an outer cylinder which are arranged at a predetermined distance from each other in a radial direction are connected by a rubber elastic body interposed therebetween. A pair of electrostrictive elements are arranged in parallel with each other between the inner cylinder and the outer cylinder so that displacement occurs in substantially different radial directions where the inner cylinder and the outer cylinder are opposed to each other. And the power supply to the pair of electrostrictive elements can be controlled independently of each other, so that the voltages applied to the pair of electrostrictive elements have waveforms in phase with each other. The resultant force based on the displacement of the element and the resultant force based on the displacement of the pair of electrostrictive elements when the waveforms are in opposite phases are different from each other between the inner cylinder and the outer cylinder. Cylindrical type characterized by being extended in the direction Vibration mount. 2. The cylindrical anti-vibration mount according to claim 1, wherein the inner cylinder is attached to one of a power plant and a support member, and the outer cylinder is attached to one of a power plant and a support member. Or a power plant supporting apparatus, which is mounted on the other side so that the power plant is vibration-isolated and supported with respect to the supporting member, wherein the pair of electrostrictive elements in the cylindrical vibration isolating mount is connected to the power plant. Positioned on both sides of the vertical plane including the torque roll axis of, the resultant force based on the displacement of the pair of electrostrictive elements when the voltages applied to the pair of electrostrictive elements have waveforms of opposite phases to each other, A power plant supporting device, wherein the power plant is applied around a torque roll axis. 3. The power plant supporting apparatus according to claim 2, wherein a voltage having a waveform having the same phase and a voltage having a waveform having a phase opposite to each other are applied to the pair of electrostrictive elements in the cylindrical anti-vibration mount. A method for controlling a cylindrical anti-vibration mount in a power plant support device, wherein the application is performed by switching according to input vibration.