JP3508792B2 - Liquid-filled mount - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled mount used for supporting a vibration body such as an automobile engine in a vibration-proof manner.

[0002]

2. Description of the Related Art As disclosed in, for example, Japanese Patent Application Laid-Open No. 6-288423, a liquid-filled mount has conventionally been provided with a substantially umbrella-shaped stirring section in a liquid chamber and a sub-diaphragm in a partition section. Is provided, and the agitator and the sub-diaphragm absorb and suppress high-frequency vibrations (high-frequency microvibrations) of different frequencies (see the graph lines in the A portion of FIG. 3 and the C portion of FIG. 6). The drop represents the effect of lowering the dynamic spring or damping due to the resonant operation of the stirring section, and the drop of the graph lines in the section B of FIG. 3 and the section D of FIG. 6 respectively represents the low dynamic spring due to the resonant operation of the sub-diaphragm. Represents the effect of damping or damping).

However, in this conventional technique, a sub-diaphragm is used to provide two resonance points (A and B in FIG. 3).
Part, part C and part D in FIG. 6) (B in FIG. 3)
Part, part D of FIG. 6), the internal pressure of the mount tends to increase due to the characteristics of the rubber-like elastic sub-diaphragm, and the dynamic spring tends to be still high. Further, for the same reason, there is a problem that it is difficult to obtain large damping due to a large pressure loss with respect to damping of low-frequency, large-amplitude vibration.

[0004]

In view of the above points, the present invention can realize two resonance points for high-frequency vibration without using a sub-diaphragm, and thus can exhibit excellent damping characteristics. A liquid-filled mount is provided.

[0005]

In order to achieve the above object, a liquid-filled mount according to claim 1 of the present invention is provided with an agitating section arranged inside a liquid chamber inside one mounting section,
A first gap for high frequency vibration is provided by setting a predetermined gap between the inner wall of the liquid chamber and the stirring unit, and a protrusion is provided in the stirring unit toward the inner wall of the liquid chamber,
A predetermined gap is set between the inner wall of the liquid chamber and the protrusion to provide a second orifice for high frequency vibration.

Further, in the liquid-filled mount according to claim 2 of the present invention, an agitating portion arranged inside the liquid chamber is provided inside one of the mounting portions, and a predetermined portion is provided between the inner wall of the liquid chamber and the agitating portion. A gap is set to provide a first orifice for high frequency vibration, and a projection is provided on the inner wall of the liquid chamber toward the stirring section, and a predetermined gap is set between the projection and the stirring section. We decided to provide a second orifice for high frequency vibration.

[0007]

In the liquid-filled mount according to claim 1 or 2 of the present invention having the above structure, the first resonance point for high frequency vibration is realized by the first orifice for high frequency vibration, and the second high frequency vibration is realized. Since the second resonance point for high-frequency vibration is realized by the vibration orifice, it is possible to realize two resonance points for high-frequency vibration without using the sub-diaphragm as in the prior art. Therefore, since the sub-diaphragm is not used, the internal pressure of the mount is low, the dynamic spring is low, and the pressure loss is small for damping low-frequency, large-amplitude vibrations, and large damping can be obtained. Becomes

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

First Embodiment: As shown in FIG. 1, one mounting portion 1 provided with a center boss 2 and a stud bolt 3 and the other mounting portion provided with an annular case 5, a cup 6 and a bolt 7. The portion 4 is connected via an elastic body (also referred to as a rubber leg) 8 made of a rubber-like elastic material having an annular shape, and a diaphragm 9 made of a rubber-like elastic material is attached to the other mounting portion 4.
Are connected with their outer peripheral edge portions, and an airtight space 10 is provided inside the mount surrounded by these, and the airtight space 10 is arranged inside (the inner peripheral side) of the other mounting portion 4 and the orifice is formed. A partition portion (also referred to as a partition member or a partition plate) 11 including a case 12 and an orifice plate 13 includes a first liquid chamber (also referred to as a main liquid chamber) 14 on one mounting portion 1 side (upper side) and a diaphragm 9 side ( It is partitioned into a second liquid chamber (also referred to as a sub-liquid chamber) 15 on the lower side, and the partition portion 11 is provided with a spiral orifice 16 for communicating the two chambers 14 and 15 with each other. A working fluid 17 such as The orifice 16 is
When low frequency large amplitude vibration is input to the mount,
The hydraulic fluid 17 exerts a damping force by passing through the orifice 16.

A stirrer (also referred to as a stirrer or stirrer plate) 18 made of a rigid material such as a metal and having a substantially umbrella shape is fixedly attached to the inner side (lower side) of the center boss 2 by a stud bolt 3, and It is arranged in the one-liquid chamber 14. Of the inner wall of the first liquid chamber 14, the inner wall of the elastic body 8 has a tapered portion 8a that widens toward the bottom.
A tapered portion 18a is provided on the outer peripheral surface of the stirring section 18 so as to face a, and a predetermined size x is provided between the inner wall of the elastic body 8 and the outer peripheral surface of the stirring section 18, as shown in an enlarged view in FIG. An annular gap 19 having ₁ is provided, and this gap 19 constitutes a first orifice for high frequency vibration 20.

Further, a protrusion 21 made of a rigid material such as a metal having an annular shape is provided on the outer peripheral surface of the stirring portion 18 toward the inner wall of the elastic body 8, and as shown in an enlarged view in FIG. An annular gap 22 having a predetermined size x ₂ is provided between the and the protrusion 21 and the gap 22 constitutes a second orifice 23 for high frequency vibration. The size x ₂ of the gap 22 is the size x ₂ of the gap 19 relating to the first orifice 20 for high frequency vibration due to the protrusion 21 protruding from the outer peripheral surface of the stirring portion 18 toward the inner wall of the elastic body 8. It is set to be smaller than ₁ (x ₂ <x ₁ ), and accordingly, the flow passage cross-sectional area of the second orifice 23 for high-frequency vibration is larger than that of the first orifice 20 for high-frequency vibration. It is set small (the flow path length is also different). The protrusion 21 is integrally provided on the agitating portion 18, but may be attached separately by molding separately.

The liquid-filled mount having the above structure is
One of the one mounting portion 1 and the other mounting portion 4 is connected to a support side such as a vehicle body of an automobile and the other is connected to a supported side such as an engine to elastically support the supported body such as the engine. The input vibration is supported and suppressed mainly by elastic deformation of the elastic body 8 and flow resistance of the hydraulic fluid 17 passing through the orifice 16, but high frequency vibration (high frequency micro vibration) of a predetermined specific frequency is generated. If entered,
As shown by the arrow E in FIG. 2, since the hydraulic fluid 17 moves in and out of the first orifice 20 for high frequency vibration, and resonates,
As indicated by a symbol F in FIG. 3, the absolute spring constant of the mount is suppressed to a low level, and this high frequency vibration can be effectively absorbed and suppressed. Further, when a high frequency vibration (high frequency micro vibration) of a different frequency (this frequency is also predetermined) is input due to a change in the vehicle speed or the engine speed, etc., as shown by an arrow G in FIG. 3 enters and leaves the second orifice 23 for high frequency vibration and resonates, so that the absolute spring constant of the mount is also kept low at this time as shown by symbol H in FIG. Absorption can be suppressed. Therefore, from the above, it is possible to realize a "low dynamic spring" over a wide frequency range and improve the damping characteristics or damping performance of the mount. Since the sub-diaphragm is not used as in the prior art, the internal pressure of the mount is low, the dynamic spring is low, and the pressure loss is small for damping low-frequency large-amplitude vibration. Can get big damping,
Also by these, the damping characteristic or the damping performance of the mount can be improved.

Second Embodiment: As shown in FIG. 4, one mounting portion 1 provided with a center boss 2 and a stud bolt 3 and the other mounting portion provided with an annular case 5, a cup 6 and a bolt 7. The portion 4 is connected via an elastic body (also referred to as a rubber leg) 8 made of a rubber-like elastic material having an annular shape, and a diaphragm 9 made of a rubber-like elastic material is attached to the other mounting portion 4.
Are connected with their outer peripheral edge portions, and an airtight space 10 is provided inside the mount surrounded by these, and the airtight space 10 is arranged inside (the inner peripheral side) of the other mounting portion 4 and the orifice is formed. A partition portion (also referred to as a partition member or a partition plate) 11 including a case 12 and an orifice plate 13 includes a first liquid chamber (also referred to as a main liquid chamber) 14 on one mounting portion 1 side (upper side) and a diaphragm 9 side ( It is partitioned into a second liquid chamber (also referred to as a sub-liquid chamber) 15 on the lower side, and the partition portion 11 is provided with a spiral orifice 16 for communicating the two chambers 14 and 15 with each other. A working fluid 17 such as The orifice 16 is
When low frequency large amplitude vibration is input to the mount,
The hydraulic fluid 17 exerts a damping force by passing through the orifice 16.

A stirring portion (also referred to as a stirring member or stirring plate) 18 made of a rigid material such as a metal and having a substantially umbrella shape is fixedly attached to the inside (lower side) of the center boss 2 by a stud bolt 3, and It is arranged in the one-liquid chamber 14. Of the inner wall of the first liquid chamber 14, the inner wall of the elastic body 8 has a tapered portion 8a that widens toward the bottom.
A tapered portion 18a is provided on the outer peripheral surface of the stirring portion 18 so as to face a, and a predetermined size x is provided between the inner wall of the elastic body 8 and the outer peripheral surface of the stirring portion 18, as shown in an enlarged view in FIG. An annular gap 19 having ₁ is provided, and this gap 19 constitutes a first orifice for high frequency vibration 20.

A buffer ring (also referred to as a buffer member) 24 made of a rigid material such as metal is embedded in the elastic body 8, and the inner peripheral end portion of the buffer ring 24 extends from the inner wall of the elastic body 8 to the outer peripheral surface of the stirring section 18. An annular protrusion 25 protruding toward
As shown in an enlarged view in FIG. 5, an annular gap 26 having a predetermined size x ₂ is provided between the protrusion 25 and the outer peripheral surface of the stirring portion 18, and the second gap 26 prevents The high frequency vibration orifice 27 is constructed. The size x ₂ of the gap 26 is determined by the protrusion 25 projecting from the inner wall of the elastic body 8 toward the outer peripheral surface of the stirring section 18.
The size is set smaller than the size x _{1 of the} gap 19 relating to the first orifice 20 for high frequency vibration (x ₂ <x ₁ ),
Along with this, a second orifice 27 for high frequency vibration is also provided.
Is set smaller than the flow passage cross-sectional area of the first orifice 20 for high frequency vibration (the flow passage length is also different). The elastic body 8 is vulcanized and adhered to the center boss 2, the case 5, and the buffer ring 24, and is divided into two by the buffer ring 24.

The liquid-filled mount having the above structure is
One of the one mounting portion 1 and the other mounting portion 4 is connected to a support side such as a vehicle body of an automobile and the other is connected to a supported side such as an engine to elastically support the supported body such as the engine. The input vibration is supported and suppressed mainly by elastic deformation of the elastic body 8 and flow resistance of the hydraulic fluid 17 passing through the orifice 16, but high frequency vibration (high frequency micro vibration) of a predetermined specific frequency is generated. If entered,
As shown by the arrow I in FIG. 5, since the hydraulic fluid 17 moves in and out of the first orifice 20 for high frequency vibration, and resonates,
As indicated by the symbol J in FIG. 6, the absolute spring constant of the mount is suppressed to a low value, and this high frequency vibration can be effectively absorbed and suppressed. Further, when a high frequency vibration (high frequency micro vibration) of a different frequency (this frequency is also a predetermined one) is input due to a change in the vehicle speed or the engine speed, etc., as shown by an arrow K in FIG. 6 enters and exits the second orifice 27 for high frequency vibration and resonates, the absolute spring constant of the mount is also kept low at this time, as indicated by the symbol L in FIG. 6, and this high frequency vibration is effective. Absorption can be suppressed. Therefore, from the above, it is possible to realize a "low dynamic spring" over a wide frequency range, and it is possible to improve the damping characteristic or damping performance of the mount. Further, since the sub diaphragm is not used as in the above-mentioned conventional technique, the internal pressure of the mount becomes low, the dynamic spring becomes low, and the pressure loss becomes small for damping low-frequency large-amplitude vibration. Can get big damping,
Also by these, the damping characteristic or the damping performance of the mount can be improved.

[0017]

The present invention has the following effects.

That is, in the liquid-filled mount according to claim 1 or 2 of the present invention having the above structure, the first resonance point for high frequency vibration is realized by the first orifice for high frequency vibration and the second resonance point is realized. Since the second resonance point for high-frequency vibration is realized by the high-frequency vibration orifice, it is possible to realize a "low dynamic spring" over a wide frequency range and improve the damping characteristics or damping performance of the mount. Can be made. Moreover, since it is possible to realize two resonance points for high-frequency vibration without using a sub-diaphragm as in the prior art, the internal pressure of the mount is low, the dynamic spring is low, and The pressure loss becomes small with respect to the damping of the vibration having the large amplitude of the frequency, and the large damping can be obtained, and the damping characteristic or the damping performance of the mount can be improved also by these.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid-filled mount according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the liquid-filled mount.

FIG. 3 is a graph showing the relationship between frequency and absolute spring constant.

FIG. 4 is a sectional view of a liquid-filled mount according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part of the liquid-filled mount.

FIG. 6 is a graph showing the relationship between frequency and absolute spring constant.

[Explanation of symbols]

1 One mounting part 2 Center boss 3 stud bolt 4 Other mounting part 5 cases 6 cups 7 volts 8 elastic body 8a taper part 9 diaphragm 10 airtight space 11 partition 12 orifice case 13 Orifice plate 14 First liquid chamber 15 Second liquid chamber 16 orifice 17 hydraulic fluid 18 Stirrer 18a taper part 19,22,26 Gap 20 First orifice for high frequency vibration 21,25 protrusion 23, 27 Second orifice for high frequency vibration 24 buffering

Claims (2)

(57) [Claims] 1. A liquid chamber (1) is provided inside one of the mounting portions (1).
4) A stirrer (18) disposed inside is provided, and a predetermined gap (19) is set between the inner wall of the liquid chamber (14) and the stirrer (18) to provide a first high-frequency vibration. A projection orifice (20) is provided, and a projection (21) is provided on the agitating portion (18) toward the inner wall of the liquid chamber (14) so that the inner wall of the liquid chamber (14) and the projection (21) A liquid-filled mount, characterized in that a predetermined gap (22) is set between them to provide a second orifice (23) for high frequency vibration. 2. The liquid chamber (1) is provided inside the one mounting portion (1).
4) A stirrer (18) disposed inside is provided, and a predetermined gap (19) is set between the inner wall of the liquid chamber (14) and the stirrer (18) to provide a first high-frequency vibration. And a projection (25) is provided on the inner wall of the liquid chamber (14) toward the stirring section (18), and the projection orifice (20) is provided between the projection (25) and the stirring section (18). A liquid-filled mount, wherein a predetermined gap (26) is set and a second orifice (27) for high frequency vibration is provided.