JPH03229033A - Engine mount device - Google Patents

Abstract

PURPOSE:To prevent magnetic grains from flowing into a lower chamber so as to prevent magnetic fluid from the degradation of performance by forming an opening at the upper chamber side of an orifice to be directed horizontally or downward from the horizon. CONSTITUTION:A space 20 is defined into a upper stage lower chamber 23 having large volume, an intermediate stage lower chamber 24 having small volume and a lower stage air chamber 25 by a first partition wall member 21 made of a metal member and a second partition wall member 22 made of a flexible elastic member. A coil 44 is connected to a voltage applying device and the intensity of magnetic field of an orifice 42 is regulated by controlled exciting current supplied from the voltage applying device. The upper chamber 23 side end of an annular orifice member 41 is bent and formed such that the opening section 40a of an orifice 40 is directed vertically downward, and the upper chamber 23 side end of each orifice member 43 is bent and formed such that the opening section 42a of the orifice 42 is directed vertically downward. Since sedimented ferrite grains 30a are uniformly dispersed, magnetic fluid 30 can be prevented from the degradation of performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine mount device for mounting an automobile engine to a vehicle body, and particularly to an engine mount device using incompressible fluid.

[Prior art]

In recent years, automobiles have been required not only to improve driving performance but also to improve the comfort and quietness of the interior of the vehicle. Engine mount devices for attaching engines to vehicle bodies, which are one of the main causes of vibration and noise that reduce the comfort and quietness of vehicle interiors, have traditionally been made of rubber as a shock absorbing member. Although mounting members are used, there is a limit to obtaining the specified vibration damping characteristics for vibrations ranging from low frequency range to medium and high frequency range. A liquid-filled engine mount device configured to obtain damping characteristics has been put into practical use.

Further, in order to simplify the structure of the liquid-filled engine mount device and easily realize vibration damping control according to various driving conditions, for example, Japanese Patent Laid-Open No. 63-183
No. 3 proposes an engine mount device using a magnetic fluid whose viscosity can be adjusted as an incompressible fluid through a magnetic field, and Japanese Patent Application Laid-Open No. 158834/1983 proposes an engine mount device using a magnetic fluid as an incompressible fluid whose viscosity can be adjusted through an electric field. An engine mount device using an ER raw fluid whose viscosity can be adjusted has been proposed.

[Problem to be solved by the invention]

As described in each of the above publications, the magnetic fluid is made by dispersing particles of a magnetic substance in water as a solvent, and the E R/A body is made by dispersing particles of a dielectric substance in water as a solvent. A dispersed fluid is used and sealed in a large-volume first chamber on the engine side and a small-volume lower chamber on the vehicle body side, which are divided by a partition member having an orifice in the magnetic fluid or ER raw fluid engine mount device. .

By the way, in the engine mount devices described in the above publications, the opening on the upper chamber side of the orifice that communicates the upper chamber and the lower chamber is formed vertically upward, so the engine mount device When no vibration is input to the upper chamber, particles of the magnetic fluid or ER raw fluid in the upper chamber flow into the lower chamber through the orifice and precipitate. Since it is difficult for the magnetic fluid to flow into the upper chamber, it accumulates in the lower chamber over a long period of time, resulting in a problem that the performance as a magnetic fluid or ERi body deteriorates and predetermined vibration damping characteristics cannot be obtained.

An object of the present invention is to provide an engine mount device that can prevent performance deterioration of the magnetic fluid or the ER/J7L body.

[Means to solve the problem]

The engine mount device according to the first aspect has an upper chamber and a lower chamber in which a magnetic fluid is sealed, and the upper chamber and the lower chamber communicate with each other through an orifice. and a magnetic field generating means capable of adjusting the strength of the magnetic field, wherein the opening on the upper chamber side of the orifice is formed in a horizontal direction or in a direction downward from the horizontal direction. .

The engine mount device according to the second claim has an upper chamber and a lower chamber filled with an ER raw fluid, and has an electric field generating means that communicates the upper chamber and the lower chamber through an orifice and generates an electric field in the orifice. In the engine mount device, the orifice is provided with an electric field generating means that can adjust the strength of the electric field, and the opening on the upper chamber side of the orifice is formed in the horizontal direction or in a direction downward from the horizontal direction.

[Effect]

In the engine mount device according to the first aspect, since the opening on the upper chamber side of the orifice is formed in the horizontal direction or in a direction downward than the horizontal direction, the magnetic particles can penetrate the orifice when the engine is stopped. The magnetic particles that settle at the bottom of the upper chamber are dispersed and levitated by the vibration input to the engine mount device when the engine is running, so the performance of the magnetic fluid is improved. There will be no decline.

In the engine mount device according to the second aspect, similarly to the first aspect, when the engine is stopped, particles of the ER source fluid do not flow into the lower chamber, and the performance of the ER source fluid does not deteriorate.

〔Effect of the invention〕

According to the engine mount device according to the first aspect, as explained in the [Operation] section above, it is possible to prevent magnetic particles from flowing into the lower chamber and to prevent the performance of the magnetic fluid from deteriorating.

According to the engine mount device according to the second claim, the first
Similarly to the claims, it is possible to prevent the ER raw fluid particles from flowing into the lower chamber, thereby preventing the performance of the ER raw fluid from deteriorating.

〔Example〕

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

As shown in FIG. 1, the engine mount device 10 of this embodiment is an engine mount device lO to which a bracket 2 forming a main vibration transmission path among a plurality of brackets on the engine side for attaching an automobile engine to a vehicle body is connected.
The present invention is applied to.

A dish-shaped lower wall member 11 is provided at the lower part of the engine mount device 1o, and a cylindrical side wall member 1 is provided on the lower wall member 11.
2 is an annular groove 12a formed in the lower part of the lower wall member 1.
The side wall member 12 has a side wall portion 12b that expands upward, and the side wall member 12 has a concave portion 13a. A similar mount member 13 is fixed to the inner circumferential surface of the side wall 12b and protrudes upward from the side wall 12.
The mounting bracket 14 having a diameter of 4a connects the cab portion 14a to the recess 13.
At is fitted and fixed to the upper end surface of the mount member 13, and a space 20 is formed between the lower end of the mount member 13 and the lower wall member 11.

The engine mount device 10 is fixed to the sub-frame 3 of the vehicle body 1 with a nut 4 through a threaded portion 11b provided on a lower wall member 11, and the engine bracket 2 is secured to a bolt 15 and a nut 5 provided on a mounting bracket 14. It is designed to be fixed and installed. Note that the reference numeral 16 is a stopper member installed inside the mount member 13.

Next, the space 20 will be explained.

The space 20 is formed by a first partition member 21 made of a metal member and a second partition member 22 made of a flexible elastic member. It is divided into a chamber 25.

The first partition member 21 includes an annular flange 11 of the lower wall member 11.
a and the annular groove 12a of the side wall member 12, and the second partition member 22 is inserted into the gap 26 at its peripheral edge. Identified.

Further, an annular orifice member 41 that forms an annular orifice 40 communicating between the upper chamber 23 and the lower chamber 24 is installed between the side wall member 12 and the first partition member 21 . Two orifice members 43 forming an orifice 42 communicating the chamber 23 and the lower chamber 24 are attached. A bobbin member 45, in which a coil 44 for forming a magnetic field in the orifice 42 is wound, is fixed to the first partition member 21 on the lower outer peripheral side of each orifice member 43, and the coil 44 is connected to a voltage supply device ( connected to the road shown in the diagram),
The strength of the magnetic field in the orifice 42 is adjusted by a controlled excitation current supplied by a voltage supply. Note that although a vertical magnetic field is formed in the orifice 42, the direction of the magnetic field may be orthogonal to the orifice 42, as long as a controlled magnetic field can be generated in the orifice 42.

The end of the annular orifice member 41 on the upper chamber 23 side is formed into a bent shape so that the opening 40a of the orifice 40 faces vertically downward, and the end of each orifice member 43 on the upper chamber 23 side The opening 42a of 42 is formed in a bent shape so as to face vertically downward.

The upper chamber 23 and the lower chamber 24 are filled with a magnetic fluid 30 in which ferrite particles 30a are dispersed using water as a solvent, and the air chamber 25 is filled with air. It is fixedly provided to the wall member 11.

Incidentally, the heater 31 is configured to be left in the mold for a predetermined period of time after the engine is started.

The operation of the engine mount device 10 configured in this way will be explained.

When the engine is stopped, the ferrite particles 30a of the magnetic fluid 30 sealed in the upper chamber 23 settle downward, but the openings 40a, 42 of the orifices 40, 42
Since the ferrite particles 30a are formed to face vertically downward, the descending ferrite particles 30a settle on the upper surface of the first partition member 21 without entering the orifices 40 and 42.

Furthermore, the ferrite particles 30a of the magnetic fluid 30 sealed in the lower chamber 24 precipitate on the upper surface of the second partition member 22. However, the amount of ferrite particles 30a precipitated on the second partition member 22 is small because the amount of magnetic fluid 30 sealed in the lower chamber 24 is small.

On the other hand, when the engine is operated, the magnetic fluid 30 sealed in the upper chamber 23 vibrates due to the vibration input to the engine mount device 10, so that the ferrite particles 30a precipitated on the first partition member 21 are uniformly dispersed. and rise to the surface. Further, since the heater 31 is heated by being energized for a predetermined period of time after the engine is started, the ferrite particles 30a precipitated on the second partition member 22 are uniformly dispersed by convection.

Furthermore, deformation due to thermal expansion of the second partition member 22 also promotes separation of the precipitated particles.

In this manner, in the engine mount device IO, the precipitated ferrite particles 30a are uniformly dispersed, so that deterioration in the performance of the magnetic fluid 30 can be prevented. In addition,
If the excitation current is controlled according to the operating state of the engine or the running state of the vehicle and the strength of the magnetic field by the coil 44 is adjusted, the damping coefficient increases, and if the strength of the magnetic field is weakened, the damping coefficient decreases.

Note that the ferrite particles 30a precipitated on the second partition member 22 may be dispersed by intermittently supplying pressurized air to the air chamber 25 instead of the heater 31.

As a modification of the above embodiment, instead of the magnetic fluid 30, an ER raw fluid upper chamber 23 made of, for example, water as a solvent and a dielectric material such as silicic acid and an organic substance dispersed with a dispersant may be used.
and the orifice 4 instead of the coil 44.
2 may be provided with an electrode that generates an electric field, and the voltage may be controlled in accordance with the operating state of the engine or the running state of the automobile.

In this case, increasing the strength of the electric field increases the viscosity of the ER raw fluid passing through the orifice 42 and increasing the attenuation coefficient, and weakening the electric field increases the ER fluid passing through the orifice 42.
The R raw fluid viscosity becomes lower and the damping coefficient becomes smaller.

<Modified example> In the engine mount device 10A of this modified example, as shown in FIG. Voltage can be applied. By providing the electrostrictive vibrator 50 in this way, the ferrite particles 3 precipitated in the upper chamber 23 can be
0a can be dispersed more efficiently. Incidentally, members similar to those in the above embodiment are given the same reference numerals, and explanations thereof will be omitted.

[Brief explanation of drawings]

1 and 2 relate to an embodiment of the present invention, FIG. 1 is a sectional view of an engine mount device, and FIG. 2 is a sectional view of an engine mount device according to a modified example. 10.IOA...Engine mount device, 23..
Upper chamber, 24... Lower chamber, 40, 42... Orifice,
40a, 42a...opening, 44...coil.

Claims (2)

[Claims] (1) A magnetic field generating means that has an upper chamber and a lower chamber filled with magnetic fluid, communicates the upper chamber and lower chamber through an orifice, and generates a magnetic field in the orifice, and the strength of the magnetic field can be adjusted. An engine mount device comprising a magnetic field generating means, characterized in that an opening on the upper chamber side of the orifice is formed in a horizontal direction or in a direction downward relative to the horizontal direction. (2) An electric field generating means that has an upper chamber and a lower chamber filled with ER fluid, communicates the upper chamber and lower chamber through an orifice, and generates an electric field in the orifice, and the strength of the electric field can be adjusted. An engine mount device comprising an electric field generating means, characterized in that an opening on the upper chamber side of the orifice is formed in a horizontal direction or in a direction downward relative to the horizontal direction.