JPH06137367A - Vehicular vibration control device - Google Patents

Abstract

PURPOSE:To provide a vehicular vibration control device by which attaching performance and productivity can be improved by unitizing a mount part and an actuator part and cost can be reduced. CONSTITUTION:A mount unit 4 in which the inside of a mount case 8 is partitioned into two liquid chambers 9 and 10 by a rubber bush 7 to receive an engine load and both these liquid chambers 9 and 10 are communicated with each other by a fixed orifice 11, is arranged, and a diaphragm 15 to block up one liquid chamber 10 is arranged extendedly in actuator cases 21 and 24, and is connected by a screw to an actuator unit 5 having an actuator composed of a coil 18, a permanent magnet 25 and the like capable of driving the diaphragm 15 according to a vibration phenomenon inside of both the cases 21 and 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator used for a vehicle engine mount.

[0002]

2. Description of the Related Art Rubber mounts and fluid mounts have been well known as engine mounts for cutting off vibrations from an engine and reducing vibrations of a vehicle body.

However, in the conventional mount as described above, it is not possible to cope with all vibration phenomena (wide frequency range) due to its structure, and for example, the natural frequency of the engine is about 20 Hz or less. For vibration transmission in the low frequency range of, by increasing the damping coefficient and spring constant to improve the ride comfort, it becomes a problem as in-vehicle noise of about 30 Hz.
There is a problem that it is not possible to cope with the above-mentioned vibration transmission in the high frequency range (for this, it is necessary to reduce the damping coefficient and spring constant).

By the way, in recent years, a fluid mount has been developed in which vibration transmission to the vehicle body from low speed rotation to high speed rotation of the engine is reduced to improve the habitability of the vehicle and the running performance. ing.

For example, as disclosed in Japanese Patent Application Laid-Open No. 57-1829, the first and second fluid chambers partitioned by a bowl-shaped rubber elastic wall are made to communicate with each other by an orifice, and the rubber elastic wall is connected to the rubber elastic wall. In a vibration isolator in which the volume of both fluid chambers is changed by the acting engine load and the enclosed liquid flows through the orifice, a part of the chamber wall of the first fluid chamber is integrated with a permanent magnet. And a sensor for detecting the relative displacement between the engine and the vehicle body by changing the volume of the first fluid chamber by expanding and contracting the bellows, and applying a magnetic field by the signal of the sensor. Then, the bellows is operated so as to promote the change in the internal pressure of the first fluid chamber in the damping region (low frequency range) and to reduce the change in the internal pressure of the first fluid chamber in the vibration damping region (high frequency region). The ones I tried to make That.

According to this, both the dynamic spring constant and the damping coefficient are large in the low frequency range, and the dynamic spring constant and the damping coefficient are both small in the high frequency range, and the intended purpose is achieved.

[0007]

However, since the bellows or the bellows are used in the vibration isolator as described above, the mount part and the actuator part must be manufactured in a lump, and the assembling process is not performed. In addition, there is a drawback in that productivity is difficult, and a stopper member is required so as not to scatter when the rubber elastic body wall is cut off, resulting in a complicated structure and high cost.

Therefore, an object of the present invention is to make it possible to retrofit the mount portion and the actuator portion to improve the assembling and the productivity and to simplify the structure by accommodating all the constituent members in the case. It is an object of the present invention to provide a vehicle vibration damping device that can reduce costs.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the structure of the present invention divides the inside of a mount case fixed to the vehicle body into two liquid chambers by a rubber bush receiving an engine load. In the actuator case, a mount unit in which both liquid chambers are communicated with each other by an orifice, a diaphragm is extended in an actuator case to close the one liquid chamber, and an actuator that can drive the diaphragm according to a vibration phenomenon is provided in the actuator case. It is characterized in that the actuator unit provided for is integrally coupled with a fastening member.

[0010]

According to the above construction, the diaphragm vibration of the diaphragm facilitates or alleviates a change in the internal pressure in one of the liquid chambers in a predetermined frequency range to obtain a predetermined damping action.

Further, the mount unit and the actuator unit can be separately manufactured, and the assembling and the productivity are improved.

Further, even if the rubber bush is cut off, it will not scatter because it is inside the mount case, so that a stopper member or the like becomes unnecessary.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 6, the engine body 2 is placed horizontally on the front part of the vehicle body 1 and the front roll mount 3A is mounted.
And the rear roll mount 3B so as to reduce the roll and vertical vibration of the engine.

The front and rear roll mounts 3
As shown in FIGS. 1 to 3, each of A and 3B includes a mount unit 4 and an actuator unit 5, which are separately produced and attached later.

The mount unit 4 is divided into two upper and lower liquid chambers 9 and 10 inside a mount case 8 bolted to the vehicle body by a rubber bush 7 which receives an engine load through an inner cylinder 6. Both liquid chambers 9, 10
Is a bush type fluid mount in which a fixed orifice 11 is communicated with.

A stepped outward flange 12 is provided around the lower end opening of the mount case 8, and a plurality of bolt insertion holes 13 for mounting the vehicle body and a plurality of screws for connecting the actuator unit are provided on the outward flange 12. Holes 14 are drilled.

On the other hand, the actuator unit 5 has a rubber diaphragm 15 which can be fitted into the step portion of the outward flange 12 to close the lower liquid chamber 10.

The outer peripheral portion of the diaphragm 15 is formed thicker in advance than the other portions in order to enhance the sealing property, and is flat as shown in the drawing when screwed later.

A top wall of a movable cylinder (coil core) 16 is joined to the lower surface of the inner peripheral portion of the diaphragm 15 via an aluminum plate 17, and a coil 18 is wound around the outer circumference of the movable cylinder 16.

Further, as shown in FIG. 5, a guide rod 19 for centering the top wall portion of the movable cylinder 16 and the central portion of the aluminum plate 17 and its flange portion 19a is placed on the lower surface of the aluminum plate 17. It penetrates in a state and is fixed by a nut 20 screwed onto the upper end thereof. In FIG. 5, 31 is a washer and 32 is an O-ring.

The lower half portion of the guide rod 19 is vertically movably fitted to the inner surface of the peripheral wall of the actuator inner case 21 via a thrust bearing 22.

At the upper end of the peripheral wall of the actuator inner case 21, there is fitted a detent pin 23 vertically provided on the top wall of the movable barrel 16.

Further, the actuator inner case 2
An actuator outer case 24 is attached to the actuator 1, and a permanent magnet 25 that constitutes an actuator together with the coil 18 is fixedly provided on the inner surface of the peripheral wall of the actuator outer case 24.

An outward flange 26 is provided around the upper end of the peripheral wall of the actuator outer case 24. The outward flange 26 is, as shown in FIG. And the screw 28.

Reference numeral 29 in FIG. 2 denotes two lead wires, which connect the coil 18 to a controller (not shown) via a connector 30. This control device detects a vibration phenomenon based on vehicle vibration, engine speed, etc., and switches the positive and negative polarities of the two lead wires 29 in a predetermined phase according to the vibration phenomenon to move the diaphragm 15 in the vertical direction. The membrane is vibrated.

With such a configuration, by vibrating the diaphragm 15 through the membrane, the volume of the lower liquid chamber 10 can be changed to promote or moderate the change in internal pressure during vibration, so that different frequency ranges can be achieved. It is obvious that vibration can be reduced.

For example, the fixed orifice 11 in the low frequency range
By setting the resonance frequency of the inner cylinder 6, the inner cylinder 6 vibrates downward and the volume of the liquid chamber 10 below becomes smaller and its internal pressure rises, while the volume of the liquid chamber 9 becomes larger and the internal pressure decreases. To do. As a result, the internal pressure difference between the two liquid chambers 9 and 10 increases, and the liquid flows in the fixed orifice. On the contrary, the inner cylinder 6 spreads upward and the volume of the liquid chamber 9 above increases, and the internal pressure rises. Conversely, the volume of the liquid chamber 10 decreases, the internal pressure rises, and the internal pressure of both liquid chambers 9 and 10 rises. The difference increases and the liquid flows through the orifice. In this frequency range, when the inner cylinder 6 folds downward and the volume of the lower liquid chamber 10 becomes small, the diaphragm 15 is urged upward by switching the positive and negative poles to the coil 18. This allows
The volume of the lower liquid chamber 10 is further reduced, and the internal pressure is further increased. As a result, the pressure difference between the two liquid chambers 9 and 10 is further increased, and the liquid flows through the fixed orifice at a higher speed, so that the flow resistance is increased and the damping action is larger than that of a normal fluid mount. On the contrary, when the inner cylinder 6 folds upward and the volume of the lower liquid chamber 10 increases, the diaphragm 15 is urged downward by switching the positive and negative electrodes to the coil 18. This further increases the volume of the lower liquid chamber 10 and reduces the internal pressure. As a result, both liquid chambers 9, 1
Since the pressure difference of 0 is further increased and the liquid flows through the fixed orifice at a higher speed, the fluid resistance and the damping action are larger than those of the normal fluid mount.

On the other hand, when the resonance frequency of the fixed orifice is set in the low frequency range, the flow in the fixed orifice disappears in the high frequency range above the resonance frequency. In this region, active control is performed to cancel vibration using the secondary source of the actuator 5. For example, in FIG.
As shown in, a control force is applied from the active mount so that the vibration input to the body becomes zero. By passing an electric current through the coil 18, the diaphragm moves up and down, and the internal pressure of the liquid chamber 10 below changes. The reaction force of the force that moves the diaphragm becomes the control force and is generated.

Further, in this embodiment, since the mount portion and the actuator portion are unitized, these two portions can be produced separately and then combined, so that the productivity is improved.

When assembling the actuator section,
The guide rod 19 is used to center the diaphragm 15 with respect to the actuator inner and outer cases 21 and 24.
Further, the detent pin 23 is swiftly and surely secured by the detent pin 23, and the assembling property is enhanced.

Further, the unitization can improve productivity and simplify the structure, thus contributing to cost reduction.

[0032]

As described above, according to the present invention, the mount portion and the actuator portion are unitized.
Not only can productivity and assembly be improved, but cost can also be reduced.

[Brief description of drawings]

FIG. 1 is a half sectional view of a roll mount showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of the same.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is an enlarged half cross-sectional view of the guide rod portion.

FIG. 6 is a view showing a mounting state of a roll mount.

[Explanation of symbols]

 1 Vehicle Body 2 Engine Body 3A Front Roll Mount 3B Rear Roll Mount 4 Mount Unit 5 Actuator Unit 7 Rubber Bushing 8 Mount Case 9,10 Liquid Chamber 11 Fixed Orifice 15 Diaphragm 18 Coil 19 Guide Rod 21 Actuator Inner Case 23 Detent Pin 24 Actuator Outer case 25 Permanent magnet 28 Screw

Claims (1)

[Claims] 1. A rubber bush which receives an engine load divides the inside of a mount case fixed to the vehicle body into two liquid chambers, and a mount unit which connects these liquid chambers with an orifice, and the one liquid. A diaphragm is extended in the actuator case to close the chamber, and an actuator capable of driving the diaphragm according to a vibration phenomenon is integrally coupled with an actuator unit provided in the actuator case by a fastening member. Anti-vibration device for vehicles.