JPH0596958A - Variable viscosity fluid enclosed mount - Google Patents

Abstract

PURPOSE:To improve heat radiating ability and restrain temperature rise of enclosed fluid by providing opposed electrodes on the inner faces of orifices communicating divided two chambers together in a housing to enclose fluid of variable viscosity, and forming wave-shaped head absorbing face on the surface of the electrodes. CONSTITUTION:Vibration of an engine is transmitted to enclosed fluid of variable viscosity by deforming the elastic body 12 of an engine mount 1. When the fluid of variable viscosity is moved between an upper chamber 4 and a lower chamber 5 through orifices 6, 7 by this vibration, the fluid receives restrictive action according to the flow. Consequently, when voltage is properly applied on a housing 2 serving as an external electrode and both inside electrodes 10, 11 so as to change viscosity of the fluid stating in the orifices 6, 7, the mount 1 can be controlled so as to exhibit its optimum damping characteristic matching the vibration characteristic of the engine. In this case, the housing is formed out of material of good thermal conductivity, the surface of external electrode is formed into wave-shaped heat absorbing face 16a, and hence heat generated in the fluid of variable viscosity can be mostly absorbed by and radiated from the housing 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount containing a variable-viscosity fluid whose viscosity can be controlled by applying a voltage, and more particularly to heat generation when energized and heat generation when vibration is attenuated. The heat dissipation is improved in order to suppress the temperature rise of the variable viscosity fluid due to the above.

[0002]

2. Description of the Related Art Conventionally, a variable-viscosity fluid-enclosed mount such as an engine mount in which a variable-viscosity fluid whose viscosity can be controlled by applying a voltage is enclosed is disclosed in JP-A-60-104828. There are things that are present. In this variable viscosity fluid mounting mount, the housing in which the variable viscosity fluid is sealed is divided into two chambers by an intermediate plate, and the two chambers are communicated with each other through a pipe provided in the intermediate plate in the radial direction. The structure is such that the plate electrodes arranged inside the intermediate plate at a distance from each other apply a voltage to the variable viscosity fluid in the pipe to control the viscosity of the variable viscosity fluid.

[0003]

However, in the variable-viscosity fluid-sealed mount having the above structure, when a voltage is applied to the variable-viscosity fluid in the piping, the variable-viscosity fluid generates heat due to its own resistance, or the variable-viscosity fluid changes. When the viscous fluid moves in the pipe, shearing heat is generated and the temperature of the variable viscosity fluid rises. Then, when the temperature of the variable viscosity fluid rises, the electric resistance of the variable viscosity fluid decreases, so that the control current increases, which causes further heat generation and further increases the current. As a result, there is a problem that proper viscosity control cannot be performed, the viscosity characteristic of the variable viscosity fluid changes, and the damping performance changes. On the other hand, in order to improve heat dissipation, a method of increasing the size of the variable-viscosity fluid-filled mount may be considered, but it is not practical to use this method due to the mounting space of the vibration generating part with respect to the vibration receiving part. It seems possible. Therefore, it is an object of the present invention to provide a variable viscosity fluid sealed mount having good heat dissipation to prevent the temperature rise of the variable viscosity fluid.

[0004]

In order to achieve the above object, a variable viscosity fluid-enclosed mount according to the present invention comprises a housing for enclosing a variable viscosity fluid, a wall portion for dividing the inside of the housing into two chambers, An orifice penetrating a wall portion and connecting the two chambers to each other, wherein a viscosity is controlled by applying a voltage to the variable viscosity fluid in the orifice, the inner surface of the housing and the wall portion Is provided at the boundary portion of the housing, an outer electrode is provided on the inner surface of the housing forming the orifice, an inner electrode is provided on the wall portion facing the outer electrode, and the housing is made of a heat conductive material. Is characterized in that a wave-shaped heat absorption surface is formed on the outer electrode surface of.

[0005]

According to the variable viscosity fluid sealed mount of the present invention,
When a voltage for viscosity control is applied to the variable viscosity fluid moving in the orifice from the outer electrode and the inner electrode, heat is generated in the variable viscosity fluid, but this heat is generated because the housing is made of a heat conductive material. It will be dissipated to the atmosphere through the housing, which has a higher thermal conductivity than the variable viscosity fluid. Further, due to the corrugation of the heat absorption surface of the outer electrode surface, the contact area of the outer electrode with the housing increases and the contact area with the variable viscosity fluid also increases. More heat will be absorbed and transferred to the housing for dissipation.

[0006]

EXAMPLES Examples of the variable-viscosity fluid-filled mount according to the present invention will be described below. The following examples are cases where the present invention is applied to an engine mount. First, the engine mount of the first embodiment will be described below with reference to FIG. In the drawing, reference numeral 1 is an engine mount, reference numeral 2 is a housing of the engine mount 1, reference numeral 3 is the inside of the housing 2 and an upper chamber 4
Walls, reference numerals 6 and 7, which are divided into a lower chamber 5 and a lower chamber 5, respectively, denote orifices that penetrate the boundary between the inner surface of the housing 2 and the wall 3 and connect the upper chamber 4 and the lower chamber 5 to each other. The engine mount 1 of the first embodiment is generally used for FF, and the bracket 2 of the housing 2 is used.
a is fixed to the vehicle body side at the mounting portion 2b below it. A shaft 3a provided at the center of the wall portion 3 is provided on a mounting bracket (not shown), and the mounting bracket supports an engine (not shown).

Inside the orifices 6 and 7 of the wall portion 3, inner electrodes 10 and 11 electrically connected to the other end of a control power source 8 having one end grounded by an electric wire 9 are provided. ing. Here, the wall portion 3 is composed of an elastic body 12 such as rubber that is deformed by vibration of an engine (not shown), and insulating layers 13 and 14 interposed between the elastic body 12 and the inner electrodes 10 and 11, respectively. It is composed. Further, the housing 2 has the outermost bracket 2a.
And the cylindrical portion 16 provided on the inner circumference of the cylindrical portion, and the bracket 2a and the cylindrical portion 16 are made of a conductive material having a high thermal conductivity such as aluminum. Therefore, the housing 2 also serves as an outer electrode by being grounded. In addition, the upper chamber outflow inlet 17 near the boundary between the orifice 6 and the upper chamber 4 to the upper chamber outflow port 1 near the boundary between the orifice 7 and the upper chamber 4.
Insulator layer 19 is provided on the inner surface of housing 2 up to 8, and similarly, lower chamber near the boundary between orifice 6 and lower chamber 5 to lower chamber near the boundary between orifice 7 and lower chamber 5 An insulator layer 22 is also provided on the inner surface of the housing 2 of the outflow port 21.

Here, the cylindrical portion 16 and the inner electrodes 10, 1
As shown in FIG. 2, the portions of the orifices 6 and 7 of No. 1 are variable viscosity fluids (the orifice 6 side and the orifice 7 side are symmetrical and only the orifice 6 side is shown in FIG. 2 and described below). Of the heat absorption surface 16a, which is the inner surface of the tubular portion 16, and the wall portion 3. The inner surface 10a of the inner electrode 10 is also formed in a wavy shape. Here, since a high voltage for control (for example, about 8000 volts) is applied between the tubular portion 16 of the housing 2 and the inner electrode 10 of the wall portion 3, the heat absorbing surface 16a of the tubular portion 16 and the inner side thereof are prevented. The inner surface 10a of the electrode 10 is provided so that the shortest distance is almost constant in any part and no electric charge is concentrated. The bracket 2a is also formed in a corrugated shape so as to be in close contact with the tubular portion 16, and the insulator layer 13 is also formed in a corrugated shape so as to be in close contact with the inner electrode 10.

In the engine mount 1 having such a structure, a variable viscosity fluid (for example, US Pat. No. 2,886,151) is used.
No. 3047507), and an engine (not shown) is mounted on a vehicle body (not shown) through the engine mount 1. When the engine generates vibration, this vibration deforms the elastic body 12 of the engine mount 1 and is further transmitted to the variable viscosity fluid. Then, this vibration causes the variable viscosity fluid to move between the upper chamber 4 and the lower chamber 5 via the orifices 6 and 7, but at this time, the variable viscosity fluid in the orifices 6 and 7 is in the flow state. A diaphragm action corresponding to is generated. Therefore, the voltage is appropriately controlled and applied to the housing 2 which is the outer electrode and the both inner electrodes 10 and 11 to change the viscosity of the variable viscosity fluid in the orifices 6 and 7, thereby changing the flow state of the variable viscosity fluid. By doing so, the engine mount 1 can be controlled so as to exhibit the optimum damping characteristic according to the vibration characteristic of the engine.

When voltage is applied to the variable viscosity fluid in the orifices 6 and 7 as described above, heat is generated in the variable viscosity fluid, but the bracket 2a of the housing 2 is used.
Since this is made of aluminum which is a good heat conducting material, this heat is dissipated to the outside air via the bracket 2a. Further, since the contact area between the tubular portion 16 and the bracket 2a increases and the contact area between the heat absorbing surface 16a and the variable viscosity fluid also increases, more heat is absorbed from the variable viscosity fluid to the bracket 2a. It will be transmitted and dissipated. Further, the housing 2 is formed of the conductive material as described above, and thereby the outer electrode is formed.
Therefore, the work of attaching the outer electrode to the inner surface of the housing 2 and the like becomes unnecessary, and the number of parts is reduced.

Next, engine mounts according to second to fourth embodiments of the present invention will be described below with reference to FIGS.
In addition, about the engine mount 1 of 2nd-4th Example, the same code | symbol is attached | subjected about the same part in each Example including 1st Example, and it demonstrates centering around each main difference.
First, the engine mount 1 of the second embodiment shown in FIG.
It is generally used for FR. In FIG. 2, reference numeral 23 is a bolt provided with an engine (not shown) via a mounting bracket, reference numeral 24 is a plate into which the bolt 23 is fitted, reference numeral 12 is an elastic body to which the plate 24 is fixed at one end, and reference numeral 2a is elastic. A cylindrical bracket made of a conductive material having high thermal conductivity such as aluminum to which the other end of the body 12 is fixed, a reference numeral 25 denotes a cylindrical member made of the same aluminum fitted in the bracket 2a, and a reference numeral 26 denotes the housing 2. The bolts for fitting the engine mount 1 to the vehicle body (not shown) are shown. The elastic body 12, the bracket 2a and the cylindrical member 25 constitute the housing 2 of the second embodiment.

Further, the inside of the housing 2 is divided into an upper chamber 4 and a lower chamber 5 by a wall portion 3 made of an insulating material, and an upper chamber 4 and a lower chamber are provided at a boundary portion between the inner surface of the housing 2 and the wall portion 3. An orifice 6 for communicating with 5 is provided.
Further, an inner electrode 10 electrically connected to one end of a control power source 8 is provided in a portion of the wall portion 3 which constitutes the orifice 6, and the housing 2 has its bracket 2a grounded to serve as an outer electrode. Also plays. And
An insulating member 27 made of an insulating material is provided on the upper end of the wall portion 3. Further, the lower chamber 5 includes the wall portion 3 and the housing 2
And a diaphragm 28 whose end portion is closely fixed. Here, as shown in FIG. 4, the portion of the cylindrical member 25 and the orifice 6 of the inner electrode 10 with respect to the flow of the variable viscosity fluid (the direction along the vertical direction in FIG. 3) is the same as in the first embodiment. Are formed so as to form a wave shape in the right-angled direction, and as a result, the heat absorption surface 16a which is the inner surface of the cylindrical member 25 and the inner surface 10a of the inner electrode 10 are formed.
Is also formed in a wavy shape. Then, similarly to the above, the cylindrical member 25 of the housing 2 and the inner electrode 10 of the wall portion 3 are
Since a high voltage for control is applied between and, the heat absorption surface 16a of the cylindrical member 25 and the inner surface 10 of the inner electrode 10
a is provided so that the shortest distance is substantially constant in any part. As described above, the same effect as that of the first embodiment can be obtained.

Next, regarding the engine mount 1 of the third embodiment shown in FIG. 5, this is different from the above second embodiment in that the insulating member 27 in FIG. It is made of an insulating material, and the housing 2
It is configured by the bracket 2a and the elastic body 12 without providing the cylindrical member 25 on the. And the bracket 2
Similarly to the second embodiment, the portion of the inner electrode 10 that constitutes the orifice 6 and the inner electrode 10 is formed so as to have a wavy shape in the direction perpendicular to the flow of the variable viscosity fluid. The heat absorption surface 16a, which is the surface, and the inner surface 10a of the inner electrode 10 of the wall portion 3 are also formed in a wavy shape (see FIG. 4). As a result, the same effect as that of the first and second embodiments can be obtained.

Next, regarding the engine mount 1 of the fourth embodiment shown in FIG. 6, the shape of the bracket of the housing 2 is changed from that of the third embodiment. Similar to the embodiment and the third embodiment, the heat absorbing surface 16a of the bracket 2a forming the orifice 6 is formed.
Also, the inner surface 10a of the inner electrode 10 is formed so as to have a wave shape in a direction perpendicular to the flow of the variable viscosity fluid (see FIG. 4), and has the same effects as those of the first to third embodiments. It plays.

The heat absorbing surface of the bracket and the inner surface of the inner electrode used in the above embodiments are substantially parallel to each other at substantially equal intervals to increase the surface area and Various shapes can be applied as long as they do not cause partial concentration of electric charges between them. For example, it is also possible to have a shape with continuous irregularities, or a shape with continuous peaks and valleys. Further, in the above embodiments, the engine mount is described as an example of the variable viscosity fluid sealed mount, but the variable viscosity fluid sealed mount is not limited to the engine mount and can be applied to various variable viscosity fluid sealed mounts used in machine tools, for example. Of course,

[0016]

As described in detail above, according to the variable viscosity fluid sealed mount of the present invention, it is possible to improve the dissipation of heat generated in the variable viscosity fluid such as shear heat. Therefore, since the temperature of the variable viscosity fluid is stable, the fluctuation of the control current is small, and proper viscosity control can be performed. Further, the viscosity characteristic of the variable viscosity fluid is stable, so that stable damping characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a main cross-sectional view showing a variable viscosity fluid enclosed mount according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG. 1 of the variable-viscosity fluid-filled mount according to the first embodiment of the present invention.

FIG. 3 is a main sectional view showing a variable viscosity fluid-filled mount according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along line YY in FIG. 3 of the variable-viscosity fluid-filled mount according to the second embodiment of the present invention.

FIG. 5 is a main cross-sectional view showing a variable viscosity fluid enclosed mount according to a third embodiment of the present invention.

FIG. 6 is a main cross-sectional view showing a variable viscosity fluid enclosed mount according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 engine mount (variable viscosity fluid filled mount),
2 housing (outer electrode), 3 walls, 4 and 5 chambers,
6,7 Orifice, 10,11 Inner electrode, 16a
Heat absorption surface

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuya Takano 1-1053 Koshigoe, Kamakura City, Kanagawa Prefecture

Claims (1)

[Claims] 1. A housing (2) for enclosing a variable viscosity fluid.
And a wall (3) dividing the inside of the housing (2) into two chambers (4,5)
And an orifice (6, 7) penetrating the wall portion (3) and connecting the two chambers (4,5) to each other, and applying a voltage to the variable viscosity fluid in the orifice (6, 7). In the variable-viscosity fluid-sealed mount (1) for controlling its viscosity by applying the orifice (6, 7) at the boundary between the inner surface of the housing (2) and the wall (3), the orifice (6 The outer electrode (2) on the inner surface of the housing (2) that constitutes the outer electrode (2).
The inner electrode (10, 11) is provided on the wall portion (3) facing to the housing (2), the housing (2) is formed of a heat conductive material, and the outer electrode (2) surface of the inner surface of the housing (2) is corrugated. A variable-viscosity fluid-enclosed mount (1), characterized in that a heat-absorbing surface (16a) having a shape is formed.