JPH08159207A - Vibration control mount - Google Patents

Abstract

PURPOSE: To improve comfortableness to ride in a vehicle by setting a sufficiently low dynamic spring constant to orthogonal directional (the direction almost orthogonal to the shock input direction) input. CONSTITUTION: An inner peripheral side rigid member 1 and an outer peripheral side rigid member 2 arranged on the outer peripheral side of this inner peripheral side rigid member 1, are connected to each other through an elastic body 3 made of a rubber-like elastic material, and a first liquid chamber 4 and a second liquid chamber 5 are arranged inside the relastic body 3 so as to be mutually displaced by almost 180 degrees, and the first liquid chamber 4 and the second liquid chamber 5 communicate with each other through a first orifice, and a third liquid chamber 7 is arranged inside a partition wall 3a of the elastic body 3 to partition the first liquid chamber 4 and the second liquid chamber 5, and the second liquid chamber 5 and the third liquid chamber 7 communicate with each other through a second orifice 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antivibration mount relating to antivibration technology. The anti-vibration mount of the present invention is mainly used as an engine mount or a cabin mount of a vehicle.

[0002]

2. Description of the Related Art An anti-vibration mount (also referred to as an active control mount or an electronically controlled liquid-filled bush, shown in FIG.
No. 2), when it is mounted on a vehicle, a sufficiently high damping force is exerted due to the viscous resistance of the hydraulic fluid moving through the orifice 51.
The shock input of Hz can be effectively attenuated, and at the same time, a sufficiently low dynamic spring constant is set due to the volume change of the liquid chamber 53 due to the operation of the electromagnetic actuator 52, whereby the rotation speed equal to or higher than the idle rotation is set. In the region, it is possible to make it difficult to transmit the vibration from the engine to the body.

However, in the conventional vibration-proof mount, the latter effect of reducing the dynamic spring constant is effective only for input in one radial direction (Z direction, vertical direction in the figure) (see FIG. 5). However, it is not possible to set a sufficiently low dynamic spring constant for an input in a direction substantially orthogonal to this (X direction, a direction substantially orthogonal to the paper surface) (see the conventional example in FIG. 6). ), There is a problem that the ride comfort of the vehicle cannot be further improved due to this.

[0004]

SUMMARY OF THE INVENTION In view of the above points, the present invention makes it possible to set a sufficiently low dynamic spring constant for the above-mentioned input in the orthogonal direction (X direction). It is an object of the present invention to provide an antivibration mount capable of improving comfort. At the same time, it is possible to set a sufficiently low dynamic spring constant for inputs in both the one direction (Z direction) and the orthogonal direction (X direction) described above, thereby improving the riding comfort of the vehicle. It is an object of the present invention to provide an anti-vibration mount capable of

The one direction (Z direction) is, in other words, "direction substantially parallel to the shock input direction" or "arrangement direction of a pair of liquid chambers (first and second liquid chambers in the present invention)". Parallel direction ", and the orthogonal direction (X direction) is
In other words, it is a “direction substantially orthogonal to the shock input direction” or a “direction substantially orthogonal to the arrangement of the pair of liquid chambers (first and second liquid chambers in the present invention)”.

[0006]

In order to achieve the above-mentioned object, a vibration-damping mount according to claim 1 of the present invention comprises an inner peripheral side rigid member and a cylindrical portion arranged on the outer peripheral side of the inner peripheral side rigid member. The outer peripheral side rigid member provided is connected via an elastic body made of a rubber-like elastic material, and the first liquid chamber and the second liquid chamber are provided inside the elastic body while being displaced by approximately 180 degrees from each other. The liquid chamber and the second liquid chamber are communicated with each other through a first orifice, and a third liquid chamber is provided inside the partition wall of the elastic body that partitions the first liquid chamber and the second liquid chamber, and the second liquid is provided. The chamber and the third liquid chamber are made to communicate with each other via the second orifice. A vibration-damping mount according to claim 2 of the present invention is the vibration-damping mount according to claim 1, wherein the outer peripheral side rigidity member is provided with a vibration member facing the first liquid chamber to change the volume of the first liquid chamber. I decided to install an actuator.

[0007]

In the vibration-damping mount according to claim 1 of the present invention having the above structure, when the vibration in the orthogonal direction (X direction) is input to the mount, the internal pressure of the third liquid chamber changes and the second orifice is closed. Due to the liquid column resonance of the moving hydraulic fluid, it is possible to set a sufficiently low dynamic spring constant in a constant frequency range while keeping the static spring constant high. Further, in the vibration-damping mount according to claim 2 of the present invention having the above-described structure, the following action is added in addition to the action according to claim 1 described above. That is, when vibration in one direction (Z direction) is input to the mount, the pressure of the first liquid chamber is changed by vibrating the vibrating member of the actuator to change the volume of the first liquid chamber step by step according to the input vibration. It is possible to set a sufficiently low dynamic spring constant while keeping the static spring constant high.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. In addition, the said Example is an Example common to Claims 1 and 2.

As shown in FIGS. 1 to 3, an inner peripheral side rigid member (also referred to as an inner cylinder) in which a pair of upper and lower stopper convex portions 1a are integrally or separately provided on the outer peripheral side based on a cylindrical shape. 1, and an outer peripheral side rigid member 2 (also referred to as an outer cylinder) including a tubular portion 2a arranged on the outer peripheral side of the inner peripheral side rigid member 1.
Are connected to each other via an elastic body 3 made of a rubber-like elastic material, and a first liquid chamber 4 and a second liquid chamber 5 are provided inside the elastic body 3 vertically displaced by about 180 degrees. The first liquid chamber 4 and the second liquid chamber 5 are communicated with each other through a pair of first orifices 6 in the axial direction. Further, a third liquid chamber 7 is provided inside the partition wall 3a of the elastic body 3 that partitions the first liquid chamber 4 and the second liquid chamber 5, and the first liquid chamber 4 and the third liquid chamber 7 communicate with each other. Instead, they are independent and the second liquid chamber 5 and the third liquid chamber 7 are communicated with each other via the second orifice 8. Further, an actuator accommodating portion 2b is provided above the outer peripheral side rigid member 2, and in the accommodating portion 2b, a plate-shaped vibrating member (such as a metal diaphragm) 22, a magnet coil 23 and a permanent magnet facing the first liquid chamber 4. An electromagnetic actuator 21 that includes 24 and changes the volume of the first liquid chamber 4 is housed, and the actuator 21 is connected to a control unit (not shown). The liquid chambers 4, 5 and 7 are filled with a hydraulic fluid 9 such as silicone oil.

The mount also includes an outer ring 10 made of a rigid material, which is arranged on the inner peripheral side of the outer peripheral side rigid member 2. That is, the outer ring 10 is provided with a pair of upper and lower windows 10a on a cylindrical surface, and a pair of axial direction ring portions 10b are connected via a connecting portion 10c between the window portions 10a. Part 10b,
As shown in FIG. 2, it is formed into a substantially L-shaped cross section or a substantially U-shaped cross section, and is sandwiched by the outer peripheral side rigid member 2 inside the L-shaped or U-shaped cross section and a part of the first orifice 6. The annular flow path 10d is formed. In FIG. 2, the first liquid chamber 4 and the first orifice 6 are not connected to each other, and the first orifice 6 and the second liquid chamber 5 are not connected to each other, but a notch (not shown) is formed in the ring portion 10b and the rubber attached to the ring portion 10b. In reality, they are connected to each other due to the provision of the communication part of the shape. Then, the inner peripheral side rigid member 1 and the outer ring 10 are used as outsert parts or insert parts,
As shown in FIGS. 1 to 3, the elastic body 3 is vulcanized and molded, and the outer peripheral side rigid member 2 is provided on the outer peripheral side of the integral vulcanized molded product.
Are fitted with a predetermined tightening margin, and both axial end portions thereof are crimped.

In addition to the partition wall 3a described above, the elastic body 3 is provided with a partition wall (also referred to as a diaphragm portion) 3b, a stopper projection 3c, a cut portion 3d, and the like. The passing paths of the first orifice 6 and the second orifice 8 are as follows, although the description partially overlaps. 1st orifice 6 ... 1st liquid chamber 4-> the ring part 10b of the outer ring 10 and the notch-shaped communicating part (not shown) provided in the rubber adhered to this ring part 10b->
An annular flow path 10d provided inside the L-shape or U-shape of the ring portion 10b of the outer ring 10 → the outer ring 1
No. 0 ring portion 10b and a notch-shaped communication portion (not shown) provided in rubber attached to the ring portion 10b → second liquid chamber 5 second orifice 8 ... second liquid chamber 5 → outer ring 10 Groove-shaped channel 1 provided on the outer peripheral surface of the connecting portion 10c of
0e → hole-shaped channel 10f provided in the connecting portion 10c of the outer ring 10 → third liquid chamber 7

In the vibration-proof mount having the above structure, when the above-mentioned vibration in the orthogonal direction (X direction) is input to the mount, the inner peripheral side rigid member 1 and the outer peripheral side rigid member 2 are relatively displaced in the same direction. The partition wall 3a of the elastic body 3 is elastically deformed and the internal pressure of the third liquid chamber 7 is changed, whereby a liquid column resonance phenomenon of the hydraulic fluid 9 moving in the second orifice 8 occurs. Therefore, due to this liquid column resonance phenomenon, it is possible to set a sufficiently low dynamic spring constant while keeping the static spring constant high in a constant frequency range. For example, this constant frequency range matches the idle rotation range. By letting
A sufficiently low dynamic spring constant can be set in this idle rotation range (see the embodiment of FIG. 6).

When the above-mentioned vibration in one direction (Z direction) is input to the mount, the vibration member 22 of the actuator 21 is vibrated to change the volume of the first liquid chamber 4 step by step according to the input vibration. It is possible to cancel the rise of the pressure of the first liquid chamber, and thereby to obtain a sufficiently low dynamic spring constant while keeping the static spring constant high (see the embodiment of FIG. 5).

Therefore, from the above, it is possible to make it difficult to transmit the vibration from the engine to the body in the orthogonal direction (X direction), or in both the one direction (Z direction) and the orthogonal direction (X direction). This can further improve the riding comfort of the automobile. In addition, about 5
For 10Hz shock input, the first orifice 6
A sufficiently high damping force is exerted by viscous resistance of the hydraulic fluid 9 which moves, whereby the shock input can be effectively damped.

[0015]

The present invention has the following effects.

That is, first, in the vibration isolating mount according to claim 1 of the present invention having the above-mentioned structure, when the vibration in the orthogonal direction (X direction) is input to the mount, the internal pressure of the third liquid chamber changes, Due to the liquid column resonance of the hydraulic fluid moving through the second orifice, it is possible to set a sufficiently low dynamic spring constant in a constant frequency range while keeping the static spring constant high. In addition to this, in the vibration-proof mount according to claim 2 of the present invention having the above-mentioned configuration, when vibration in one direction (Z direction) is input to the mount, the vibration member of the actuator is vibrated. It is possible to cancel the rise of the pressure of the first liquid chamber by changing the volume of the one liquid chamber one by one in response to the input vibration, thereby setting a sufficiently low dynamic spring constant while keeping the static spring constant high. be able to. Therefore, from these facts, it is possible to make it difficult to transmit the vibration from the engine to the body in the orthogonal direction (X direction), or in both the one direction (Z direction) and the orthogonal direction (X direction), and thereby, the automobile The riding comfort of the vehicle can be further improved.

[Brief description of drawings]

FIG. 1 is a front view of an anti-vibration mount according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

3 is a sectional view taken along line BB in FIG.

FIG. 4 is a sectional view of an anti-vibration mount according to a conventional example.

FIG. 5 is a graph showing changes in the Z-direction dynamic spring constant.

FIG. 6 is a graph showing changes in the X-direction dynamic spring constant.

[Explanation of symbols]

 1 inner peripheral side rigid member 1a, 1b stopper convex part 2 outer peripheral side rigid member 2a cylindrical part 2b actuator accommodating part 3 elastic body 3a partition wall 3b partition wall 3c stopper protrusion 3d stick part 4 first liquid chamber 5 second liquid chamber 6th One orifice 7 Third liquid chamber 8 Second orifice 9 Working fluid 10 Outer ring 10a Window part 10b Ring part 10c Connection part 10d Annular flow path 10e Groove flow path 10f Hole flow path 21 Actuator 22 Vibrating member 23 Magnet coil 24 Permanent magnet

Claims (2)

[Claims] 1. A rubber-like elastic member comprising an inner peripheral side rigid member (1) and an outer peripheral side rigid member (2) having a cylindrical portion (2a) arranged on the outer peripheral side of the inner peripheral side rigid member (1). Connected via an elastic body (3) made of a material, and a first liquid chamber (4) and a second liquid chamber (5) are provided inside the elastic body (3) while being displaced by approximately 180 degrees from each other, and The one liquid chamber (4) and the second liquid chamber (5) are communicated with each other through the first orifice (6) to partition the first liquid chamber (4) and the second liquid chamber (5) into the elastic body ( The third liquid chamber (7) is provided inside the partition wall (3a) of 3), and the second liquid chamber (5) and the third liquid chamber (7) are communicated with each other through the second orifice (8). Anti-vibration mount that is characterized. 2. The vibration-proof mount according to claim 1, wherein the outer peripheral side rigid member (2) is provided with a vibrating member (22) facing the first liquid chamber (4). An antivibration mount comprising an actuator (21) for changing the volume.