JPH0612852U - Liquid-filled mount - Google Patents

Abstract

(57) [Summary] [Purpose] Excellent vibration damping effect is achieved when the input vibration is high-frequency, small-amplitude vibration. Further, the pump effect for the flow of the hydraulic fluid 15 is increased, and an excellent vibration damping effect is exhibited even when the input vibration is a low frequency large amplitude vibration. [Structure] A sub-diaphragm 10 is provided that resonates with respect to high-frequency, small-amplitude vibration. In addition, a sub diaphragm plate 11 is provided at the tip of the sub diaphragm 10,
Sub diaphragm plate 11 and orifice plate 9
The sub-diaphragm 10 is slidable with respect to the inner peripheral surface of the
Buckling is prevented, and the spring constant of the sub diaphragm 10 is prevented from increasing. In addition, an inner sleeve 6 is provided between the rigid member 1 on the inner peripheral side and the diaphragm 4 to exert a pumping action on the flow of the hydraulic fluid 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a liquid-filled mount related to vibration isolation technology. The liquid-filled mount of the present invention is mainly used for the vibration-damping support structure of an automobile cabin.

[0002]

[Prior art]

 As shown in FIG. 3, a known liquid-filled mount of this type is designed to absorb and attenuate the input vibration by elastic deformation of the elastic body a and flow resistance of the hydraulic fluid c passing through the orifice flow path b. (See Japanese Patent Laid-Open No. 64-35138).

[0003]

[Problems to be solved by the device]

 However, this liquid-filled mount has the following problems. When the input vibration is high frequency and small amplitude vibration, this vibration cannot be absorbed and damped sufficiently. Since the hydraulic fluid c flows only by the pump action due to the elastic deformation of the elastic body a, the pump effect is small. The diaphragm d only passively deforms as a result of the flow of hydraulic fluid c.

[0004]

[Means for Solving the Problems]

 In view of the above points, the present invention has been devised to solve the problems found in the above-mentioned prior art. In order to achieve this object, as shown in claim 1, the rigidity on the inner peripheral side is set. A boss is provided on the outer peripheral side of the member, an outer peripheral side rigid member is connected to the outer peripheral side of the boss via an elastic body, and the inner peripheral side rigid member and the outer peripheral side rigid member are connected via a diaphragm. A liquid chamber surrounded by the inner rigid member, the boss, the elastic body, the outer rigid member, and the diaphragm is provided, and the orifice plate is provided inside the liquid chamber on the inner peripheral side of the outer rigid member. A sub-diaphragm is provided on the boss toward the diaphragm, a sub-diaphragm plate is provided at the tip of the sub-diaphragm, and the sub-diaphragm plate is attached to the inner peripheral surface of the orifice plate. It is movable, and the liquid chamber is partitioned into two chambers by the orifice plate, the sub-diaphragm and the sub-diaphragm plate, and the orifice plate is provided with an orifice flow path communicating the two chambers with each other, and the liquid chamber is filled with the working fluid. A liquid-filled mount is provided.

According to a second aspect of the present invention, in the liquid-filled mount according to the first aspect, an inner sleeve that exerts a pumping action on the flow of hydraulic fluid is provided between the rigid member on the inner peripheral side and the diaphragm. A liquid-filled mount is provided.

[0006]

[Action]

 The liquid-filled mount according to the first aspect of the invention operates as follows depending on whether the input vibration is a low-frequency large-amplitude vibration or a high-frequency small-amplitude vibration. A) When the input vibration is a low-frequency, large-amplitude vibration When the vibration is input, the rigid member on the inner peripheral side and the rigid member on the outer peripheral side are displaced relative to each other and the elastic body is elastically deformed. The pumping action moves the hydraulic fluid from one of the two chambers to the other through the orifice channel, and the flow resistance generated during this passage absorbs and damps vibrations. B) When the input vibration is high-frequency, small-amplitude vibration When vibration is input, the inner peripheral side rigid member and the outer peripheral side rigid member are displaced relative to each other, and the elastic body is elastically deformed, as in item A. Since the amount of elastic deformation is small, vibration is absorbed and damped only by the resonance of the sub-diaphragm.

The sub-diaphragm is provided with a sub-diaphragm plate at its tip, and the sub-diaphragm plate is slidable with respect to the inner peripheral surface of the orifice plate, and thus is pressed against the orifice plate during vibration input. No dullness, no buckling.

In the liquid-filled mount according to the second aspect, not only the elastic body but also the inner sleeve exerts a pumping action on the flow of the working fluid.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, an annular boss 2 is fixed to the outer peripheral side of a rigid member 1 on the inner peripheral side having a cylindrical shape or a columnar shape (cylindrical shape in the figure), and on the outer peripheral side of the boss 2. A cylindrical rigid member 4 on the outer peripheral side is connected via an annular elastic body 3. The rigid member 1 and the boss 2 on the inner peripheral side may be integrated. The elastic body 3 is a rubber material and is vulcanized and adhered to each of the boss 2 and the rigid member 4 on the outer peripheral side. The rigid member 1 on the inner peripheral side and the rigid member 4 on the outer peripheral side are connected via a diaphragm 5 in the upper and lower portions of the figure. The diaphragm 5 is made of rubber and is vulcanized and bonded to the inner sleeve 6 and the outer sleeve 7, respectively, to fix the inner sleeve 6 to the inner rigid member 1 and the outer sleeve 7 to the outer rigid member 4. By doing so, it is interposed between the rigid member 1 on the inner peripheral side and the rigid member 4 on the outer peripheral side. An airtight liquid chamber 8 is provided inside the mount by using the above components.

Inside the liquid chamber 8, an annular orifice plate 9 is fixed to the inner peripheral side of the rigid member 4 on the outer peripheral side, and an annular sub-diaphragm 10 is fixed to the boss 2 toward the diaphragm 5. There is. The sub-diaphragm 10 is a rubber material, is vulcanized and bonded to the boss 2, and is molded integrally with the elastic body 3 or as a separate body (integral in the figure). An annular sub-diaphragm plate 11 is fixed to the tip of the sub-diaphragm 10, and the sub-diaphragm plate 11 is slidable with respect to the inner peripheral surface of the orifice plate 9. The liquid chamber 8 is partitioned into a first liquid chamber 12 and a second liquid chamber 13 by having an orifice plate 9, a sub-diaphragm 10 and a sub-diaphragm plate 11, and the orifice plate 9 connects the two chambers 12 and 13 to each other. A spiral orifice flow path 14 is provided. The liquid chamber 8 is filled with the hydraulic fluid 15.

In the liquid-filled mount having the above structure, one of the inner peripheral side rigid member 1 and the outer peripheral side rigid member 4 is connected to the support side, and the other is connected to the supported side. Works like. The operation differs depending on whether the input vibration is a low-frequency large-amplitude vibration or a high-frequency small-amplitude vibration. The vibration is input in the vertical direction in the figure. A) When the input vibration is a low-frequency large-amplitude vibration When the vibration is input, the rigid member 1 on the inner peripheral side and the rigid member 4 on the outer peripheral side are displaced relative to each other, and the elastic body 3 is elastically deformed. The hydraulic fluid 8 moves from one of the two chambers 12 and 13 to the other through the orifice passage 14 by the pumping action due to the elastic deformation of the fluid, and the vibration is absorbed and damped by the flow resistance generated when the fluid flows. B) When the input vibration is a vibration of high frequency and small amplitude When the vibration is input, the rigid member 1 on the inner circumference side and the rigid member 4 on the outer circumference side are displaced relative to each other and the elastic body 3 is elastically deformed, as in the case of the item A. However, since the amount of elastic deformation is small, vibration is absorbed and damped only by the resonance of the sub diaphragm 10. In other words, the Bane constant can be switched to a low value.

In the above operation, it is assumed that the sub-diaphragm plate 11 is not fixed to the tip of the sub-diaphragm 10 and the tip of the sub-diaphragm 10 is in contact with the end surface of the orifice plate 9 (upper end surface in the figure). If configured, the sub-diaphragm 10 is pressed against the orifice plate 9 and buckled when vibration is input, which may cause an inconvenience such as an abnormally high spring constant of the sub-diaphragm 10. is there. However, according to the structure shown in FIG. 1, the sub-diaphragm 10 is provided on the boss 2 toward the diaphragm 5, the sub-diaphragm plate 11 is provided at the tip, and the sub-diaphragm plate 11 is attached to the inner peripheral surface of the orifice plate 9. Since it is slidable, the sub-diaphragm 10 is not pressed against the orifice plate 9 and buckled when vibration is input, and the spring constant of the sub-diaphragm 10 does not increase. Therefore, according to this structure, the sub-diaphragm 10 always resonates sensitively with high-frequency and small-amplitude vibration, and this vibration can be sufficiently absorbed and damped.

FIG. 2 shows a second embodiment of the present invention, which has a configuration different from that of the first embodiment in the following points. That is, the radial width w of the inner sleeve 6 that fixes the diaphragm 5 to the rigid member 1 on the inner peripheral side is set to be larger than that in the case of FIG. 1, and the inner sleeve 6 allows the hydraulic fluid 15 to flow when vibration is input. On the other hand, it positively exerts a pumping action. Therefore, according to the structure, since both the elastic body 3 and the inner sleeve 6 exert a pumping action on the flow of the hydraulic fluid 15 from above and below, the pumping effect is large, and the input vibration of low frequency and large amplitude is generated. On the other hand, it exerts a great vibration damping effect. Since the radial width of the diaphragm 5 decreases as the radial width of the inner sleeve 6 increases, the diaphragm 5 is divided into the rigid member 1 on the inner peripheral side and the rigid member 4 on the outer peripheral side. The cross-sectional shape of the diaphragm 5 has a corrugated shape so as to follow the relative displacement.

[0015]

[Effect of device]

 The present invention has the following effects. In other words, since the sub-diaphragm that resonates with high-frequency, small-amplitude vibrations is provided, excellent vibration isolation is achieved not only when the input vibration is a low-frequency, large-amplitude vibration, but also when it is a high-frequency, small-amplitude vibration. Be effective. Moreover, since the sub-diaphragm is configured to prevent buckling, the sub-diaphragm always resonates sensitively to high-frequency, small-amplitude vibrations, and this also provides excellent vibration damping effect. In addition, when an inner sleeve that provides a pumping action against the flow of hydraulic fluid is provided between the rigid member on the inner peripheral side and the diaphragm, the pumping effect is large and the input vibration of low frequency and large amplitude is large. Exhibits anti-vibration effect.

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

FIG. 3 is a cross-sectional view of a liquid-filled mount according to a conventional example.

[Explanation of symbols]

 1 Rigid member on inner peripheral side 2 Boss 3 Elastic body 4 Rigid member on outer peripheral side 5 Diaphragm 6 Inner sleeve 7 Outer sleeve 8 Liquid chamber 9 Orifice plate 10 Sub diaphragm 11 Sub diaphragm plate 12 First liquid chamber 13 Second liquid chamber 14 Orifice channel 15 hydraulic fluid

Claims (2)

[Scope of utility model registration request] 1. A boss (2) is provided on the outer peripheral side of a rigid member (1) on the inner peripheral side, and an elastic body (3) is provided on the outer peripheral side of the boss (2).
The rigid member (4) on the outer peripheral side is connected through the rigid member (1) on the inner peripheral side and the rigid member (4) on the outer peripheral side through the diaphragm (5). A liquid chamber (8) surrounded by the rigid member (1), the boss (2), the elastic body (3), the outer peripheral rigid member (4) and the diaphragm (5). Inside, an orifice plate (9) is provided on the inner peripheral side of the rigid member (4) on the outer peripheral side, a sub-diaphragm (10) is provided on the boss (2) toward the diaphragm (5), and the sub-diaphragm ( 10) is provided with a sub-diaphragm plate (11) at its tip, the sub-diaphragm plate (11) is slidable with respect to the inner peripheral surface of the orifice plate (9), and the liquid chamber (8) is provided with the orifice plate. (9), sub diaphragm Beam (10) and the sub diaphragm plate (11) by two-chamber (12) (1
3), the orifice plate (9) is provided with an orifice channel (14) for communicating the two chambers (12) and (13) with each other, and the liquid chamber (8) is filled with a working fluid (15). Enclosed mount. 2. The liquid-filled mount according to claim 1, wherein an inner sleeve that exerts a pumping action on the flow of the hydraulic fluid (15) between the rigid member (1) on the inner peripheral side and the diaphragm (5). 6) A liquid-filled mount characterized by being provided.