JPH03239832A - Engine mounting device - Google Patents

Abstract

PURPOSE:To regulate engine vibration by forming a fluid chamber in wall section of a rubber member, charging magnetic fluid in the fluid chamber, providing an electromagnetic coil for generating a magnetic field in the fluid chamber, and varying the dynamic spring constant of the rubber member. CONSTITUTION:Fluid is charged in a main-chamber 33 and sub-chamber 34 which are communicated to each other through an orifice. The upper end of the main-chamber 33 is clogged by a thick rubber member 13. In the wall member of the rubber member 13, a fluid chamber 20 is provided. In the fluid chamber 20, magnetic fluid 50, whose viscosity changes according to the strength of a magnetic field, is enclosed. A bobbin member 22 is secured to the peripheral section of the fluid chamber. Around this bobbin member 22, a coil 21 for forming a magnetic field in the fluid chamber 20 in a nearly vertical direction. The dynamic spring constant of the rubber member 13 is adjusted through the magnetic coil 21. Thus, the vibration of an engine can be regulated.

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.

[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. The upper end of the main chamber is closed with a thick rubber member for cushioning, and the bottom of the sub-chamber is closed with a flexible elastic member.
A liquid-filled engine mount device configured to obtain excellent vibration damping characteristics has been put into practical use.

Further, in the liquid-filled engine mount device, in order to easily realize vibration damping control corresponding to various engine operating conditions and driving conditions, for example, Japanese Patent Application Laid-Open No. 63-18
No. 33 proposes an engine mount device using a magnetic fluid whose viscosity can be adjusted as the liquid through a magnetic field, and JP-A-63-158834 proposes a magnetic fluid whose viscosity can be adjusted as the liquid through an electric field. An engine mount device using the ER fluid obtained has been proposed.

[Problem to be solved by the invention]

In the above-mentioned liquid-filled engine mount device, large damping characteristics are obtained only for relatively low-frequency vibrations through the orifice, and according to the device in the above-mentioned publication, the strength of the magnetic field and electric field generated in the orifice is By adjusting the height, the damping coefficient in the above damping characteristic can be adjusted in size.

By the way, when considering the dynamic spring constant of these engine mount devices, the dynamic spring constant of the rubber member is constant, and the dynamic spring constant of components other than the rubber member varies depending on the strength of the magnetic field and electric field. It becomes a large value only for high frequency vibrations, and becomes an extremely small value for low and medium frequency vibrations.

In other words, since conventional engine mount devices do not have any means for adjusting the dynamic spring constant of the rubber member, the dynamic spring constant of the entire engine mount device can be adjusted to the desired characteristics depending on the engine operating and traveling conditions. It was not possible to adjust it so that

An object of the present invention is to provide a liquid-filled engine mount device that can vary the dynamic spring constant of a rubber member.

[Means to solve the problem]

In the engine mount device according to the first aspect, a main chamber and an auxiliary chamber that communicate with each other through an orifice are filled with liquid, the upper end of the main chamber is closed with a thick rubber member, and the bottom of the auxiliary chamber is made flexible. In a liquid-filled engine mount device that is closed with a rubber member, there is a liquid chamber formed within the wall of the rubber member, a magnetic fluid filled in the liquid chamber, and an electromagnetic fluid that generates a magnetic field in the liquid chamber. It is equipped with a coil.

In the engine mount device according to the second aspect, a main chamber and an auxiliary chamber that communicate with each other through an orifice are filled with liquid, the upper end of the main chamber is closed with a thick rubber member, and the bottom of the auxiliary chamber is made flexible. In a liquid-filled engine mount device closed with a rubber member, an electric field is generated in a liquid chamber formed within a wall of the rubber member, an electrorheological fluid filled in the liquid chamber, and the liquid chamber. It is equipped with an electrode.

[Effect]

In the engine mount device according to the first aspect, the liquid chamber formed in the wall of the rubber member is filled with magnetic fluid, and the liquid chamber is provided with an electromagnetic coil that generates a magnetic field. When the strength of the magnetic field acting on the magnetic fluid is weakened, the viscosity of the magnetic fluid decreases and the dynamic spring constant of the rubber member becomes smaller. When the strength of the magnetic field is increased, the viscosity of the magnetic fluid increases and the dynamic spring constant of the rubber member decreases. The dynamic spring constant of increases.

In this way, the dynamic spring constant of the rubber member can be adjusted in size via the electromagnetic coil, so the dynamic spring constant of the engine mount device can be freely changed to suit the operating and driving conditions of the engine. .

In the engine mount device according to the second claim, when the strength of the electric field applied to the electrorheological fluid through the electrode is weakened, the viscosity of the electrorheological fluid decreases, and the rubber member When the dynamic spring constant becomes small and the strength of the electric field is increased, the viscosity of the electrorheological fluid increases and the dynamic spring constant of the rubber member increases.

In this way, the dynamic spring constant of the rubber member can be adjusted in size through the electrodes, so the dynamic spring constant of the engine mount device can be freely changed to suit the operating conditions and running conditions of the engine.

〔Effect of the invention〕

According to the engine mount device according to the first aspect, as explained in the above section C, the dynamic spring of the engine mount device is Constants can be changed freely. For example, when engine vibration in the low and medium frequency range becomes intense due to torque fluctuations such as during sudden acceleration, the dynamic spring constant is controlled to match the engine operating conditions and driving conditions, such as increasing the dynamic spring constant to suppress vibration. It becomes possible to do so.

According to the engine mount device according to the second aspect, as explained in the above [Function] section, by providing the rubber member with the liquid chamber filled with electrorheological fluid and the electrode, the first
As in the claims, the dynamic spring constant of the engine mount device can be freely changed, and the dynamic spring constant can be controlled in accordance with the engine operating state and the traveling state.

[First Embodiment] Hereinafter, a first embodiment of the present invention will be described based on the drawings.

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

A dish-shaped lower wall member 11 is provided at the lower part of the engine mount device IO, 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 (
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 thick mounting member 13 made of aluminum is fixed to the inner circumferential surface of the side wall portion 12b and protrudes upward from the side wall member 12, and the mounting member 13 is provided with a mounting bracket 14 having a cab portion 14a for vibration transmission. The portion 14a is fitted into the recess 13a and fixed to the upper end surface of the mount member 13.

Furthermore, four liquid chambers 20 are provided in the wall of the mount member 13 at predetermined intervals in the circumferential direction, and a space 30 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 subframe 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 fixed with 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, each of the liquid chambers 20 will be explained.

Each liquid chamber 20 is filled with a magnetic fluid 50 whose viscosity changes depending on the strength of the magnetic field, for example, a magnetic fluid 50 in which ferrite particles are dispersed using water as a solvent. A bobbin member 2 is wound around a coil 21 for forming a magnetic field in a downward direction on the road in a liquid chamber 20.
2 is attached, and both ends of the coil 2 are connected to a voltage supply device 24 via a lead wire 23. The current supply device 24 is connected to the controller 25, and the controller 25
It is controlled to supply excitation current to the second coil by a control signal from the coil. The controller 25 receives signals from the vehicle speed sensor and the engine speed sensor manually, and is equipped with a microcomputer or a programmable controller, and operates the engine based on inputs from each sensor and a preset control program. The current supply device 24 sends control signals according to the state and running state.
It is designed to output to .

Next, the space 30 will be explained.

The space 30 is formed by a first partition member 31 made of a metal member and having two orifices 40, and a second partition member 32 made of a flexible elastic member, and a main chamber 33 in the upper stage, an auxiliary chamber 34 in the middle stage, and air in the lower stage. The first partition member 3 is divided into a chamber 35 and a chamber 35.
(2) The second partition wall member 32 is inserted and fixed with its peripheral edge surface into the gap 17 formed between the annular flange 11a of the lower wall member 11 and the annular groove 12a of the side wall member 12. The chamber 34 is filled with the same magnetic fluid 50A as described above, and the air chamber 35 is filled with air.

The above-mentioned orifice portions 40 will be explained with reference to FIG. 2. A bobbin member 41 is installed in the installation hole 31a formed at one end of the first partition member 31, and an orifice is installed in the center of the bobbin member 41. 42 is formed penetrating therethrough.

The orifice 42 is surrounded by a steel thin tube 42a, and a coil 43 is wound around the upper and lower ends of the thin tube 42a concentrically with the orifice 42, and both ends of each coil 43 are connected to each other via a lead wire 44. connected to the current supply device 24,
The current supply device 24 supplies an exciting current to the coil 43 in response to a control signal outputted from the controller 25 that corresponds to the operating state and running state of the engine.

Next, the operation of the engine mount device 10 will be explained.

The strength of the magnetic field of the orifice 42 becomes strong, medium or weak depending on whether the excitation current supplied to the coil 43 is large or medium, but the viscosity of the magnetic fluid 50A becomes high or medium or low depending on the strength of the magnetic field. Therefore, the damping coefficient due to the magnetic fluid flowing through the orifice 42 is as shown in FIG. 3, and the dynamic spring constant due to the magnetic fluid flowing through the orifice 42 and the second partition member 32 is as shown in FIG. 4.

The viscosity of the magnetic fluid 50 becomes high, medium or low depending on the strength of the magnetic field applied to the liquid chamber 20 by the coil 21, so the damping coefficient and dynamic spring constant of the magnetic fluid 50 and the mount member 13 are The results are as shown in Figures 5 and 6, respectively. still,
Although the magnetic fluid 50 is incompressible, when the mount member 13 is elastically deformed, the liquid chamber 2 of the magnetic fluid 50
Since the flow occurs within 0, the viscosity of the magnetic fluid 50 affects the dynamic spring constant of the mount member 13.

Therefore, by changing the strength of the magnetic field of the orifice 42 and the strength of the magnetic field of the liquid chamber 20 in various combinations, the damping coefficient and dynamic spring constant of the engine mount device 10 can be adjusted freely.

For example, when the engine is in the idle state, it is desirable to increase the damping coefficient and decrease the dynamic spring constant in order to prevent the engine from resonating in a low frequency vibration region such as shake and idle vibration.

In this case, the magnetic field of the orifice 42 is strengthened and the liquid chamber 20 is
All you have to do is weaken the magnetic field.

During sudden acceleration, the engine torque changes suddenly, resulting in severe engine vibration in the low-frequency vibration region and the engine tilting around the torque roll axis.In order to soften this tilting, the damping coefficient is increased and the engine It is desirable to increase the dynamic spring constant to suppress vibration. In this case, the magnetic field of the orifice 42 and the liquid chamber 20 may be strengthened.

Furthermore, during steady driving, engine vibration causes car body vibrations and muffled noise inside the cabin in the medium and high frequency vibration range, so in order to reliably absorb engine vibrations, the damping coefficient and dynamic spring constant are reduced. This is desirable. In this case, the magnetic field of the orifice 42 and the liquid chamber 20 may be weakened.

[Second Example] Next, a second example will be described. However, the same members as in the first embodiment are given the same reference numerals and the explanation thereof will be omitted.

The engine mount device 10A of this embodiment is made of, for example, water as a solvent and a dielectric material such as silicic acid and an organic substance dispersed with a dispersant instead of the magnetic fluid 50/50A of the above embodiment. Electrorheological fluids 50B and 50C whose viscosity can be adjusted are used.

That is, as shown in FIG. 7, each of the four liquid chambers 20A formed within the wall of the mount member 13 is filled with an electrorheological fluid 5.
0B is filled in, and the main chamber 33 and the sub chamber 34 are filled with electrorheological fluid 50C, respectively.

In order to form an electric field in each liquid chamber 20A, each liquid chamber 20A is
Electrodes 22A are provided on the upper and lower walls of A, respectively, and each electrode 22A is connected to a current supply device f24A via a lead wire 23A.
It is connected to the. The current supply device 24A is connected to the controller 25A, and supplies voltage to each electrode 22A in response to a control signal from the controller 25A. In addition, the orifice portion 40A of the first partition member 31 includes:
As shown in FIG. 8, an electrode member 41A is provided having a pair of electrodes 42b arranged oppositely with an orifice 42 in between, and each electrode 42b is connected to a current supply device 24A via a lead wire 44A. ing.

In addition, the code|symbol 25A is a controller.

The strength of the electric field in the liquid chamber 20A and the orifice 42 becomes strong or weak depending on the voltage applied to the electrode 22A and the electrode 42b, and the viscosity of the electrorheological fluids 50B and 50C depends on the strength of the electric field. It is designed to be adjusted to high, medium and low depending on the strength, medium and weakness. Therefore, by changing the strength of the electric field in the liquid chamber 2 (IA) and the orifice 42 in various combinations, the damping coefficient and dynamic spring constant of the engine mount device 10A can be adjusted freely depending on the operating state and running state of the engine. Note that instead of the four liquid chambers 20A, one liquid chamber may be formed in the wall of the mount member 13 in an annular shape.

[Third Example] Next, a third example will be described. However, the same members as in the first embodiment are given the same reference numerals and their explanations will be omitted.

As shown in FIG. 9, the engine mount device 10B of this embodiment is similar to the engine mount device 10 of the first embodiment described above.
A first partition member 31A having a variable orifice portion 40B is provided in place of the first partition member 31, and the main chamber 33 and sub chamber 34 are
In place of the magnetic fluid 50A, for example, an antifreeze liquid 50D such as ethylene glycol is sealed.

The variable orifice portion 40B includes an orifice member 40a that is fixed to a mounting hole 31b formed in the center of the first partition member 31A and has an orifice 42C, and an orifice member 40a that is slidably fitted into the orifice member 40a and has an orifice 42d. It consists of a member 4ob, and a variable orifice 42A is configured by an orifice 42C and an orifice 42d.

Further, in order to adjust the position of the orifice member 40b in the vertical direction, an orifice variable mechanism 60 is provided as follows.

That is, the solenoid 61 disposed in the recess 13a of the mount member 13 is fixed to the cab portion 14a, and the solenoid 61 is fixed to the cab portion 14a.
The first output lot 61a passes through the mount member 13 and extends toward the main chamber 33, and its lower end is fixed to the outer periphery of the upper end of the orifice member 40b. In addition, the orifice member 40
A compression coil spring 63 that biases the orifice member 40b downward is provided externally on the output rod 61a between the upper end of the orifice member 40b and the receiving member 62 fixed to the lower end of the mount member 13.

The solenoid 6e is connected to a current supply device 24B via a lead wire 64, and the current supply device 24B supplies an exciting current to the solenoid 61 based on a control signal output from the controller 25B, thereby increasing the height of the orifice member 40b. The orifice length of the orifice 42A consisting of the orifices 42C and 42d is controlled by M by adjusting the position in the longitudinal direction.

Depending on the length of the orifice 42A, the attenuation coefficient due to the antifreeze 50D flowing through the orifice 42A is the first.
The dynamic spring constant due to the antifreeze fluid 50D flowing through the orifice 42A, the second partition member 32, etc. is as shown in FIG. 11.

Then, the magnetic fluid 50 and the mount member 1
The damping coefficient and dynamic spring constant of 3 are shown in FIGS. 12 and 13, respectively.

Therefore, by changing the length of the orifice 4.2A and the strength of the magnetic field in the liquid chamber 20 in various combinations, the damping coefficient and dynamic spring constant of the engine mount device 10B can be adjusted to suit the engine operating condition and running condition, respectively. You can freely adjust it according to your needs. Note that in place of the liquid chamber 20, a liquid chamber filled with an electrorheological fluid and an electrode may be provided.

[Brief explanation of drawings]

1 to 13 show embodiments of the present invention.
The figure is a sectional view of the engine mount device according to the first embodiment,
Fig. 2 is an enlarged view of the orifice section of the same device, Fig. 3 is a characteristic diagram of the damping coefficient of the main chamber and sub-chamber of the same device, and Fig. 4 is a characteristic of the dynamic spring constant of the main chamber and sub-chamber of the same device. Figure 5 is a characteristic diagram of the damping coefficient of the mount member and liquid chamber of the same device, Figure 6 is a characteristic diagram of the dynamic spring constant of the mount member and liquid chamber of the same device, and Figure 7 is a characteristic diagram of the second embodiment. Sectional view of the engine mount device, No. 8
The figure is an enlarged view of the orifice part of the same device, FIG. 9 is a sectional view of the engine mount device according to the third embodiment, FIG. 10 is a characteristic diagram of the damping coefficient of the main chamber and subchamber of the same device, and FIG. 11 is a characteristic diagram of the dynamic spring constant of the main chamber and auxiliary chamber of the same device, Fig. 12 is a characteristic diagram of the damping coefficient of the mount member and liquid chamber of the same device, and Fig. 13 is a characteristic diagram of the dynamic spring constant of the mount member and liquid chamber of the same device. It is a characteristic diagram of a spring constant. 1O-10A・IOB・・Engine mount device, 13
・・Mount member, 20・20A・・Liquid chamber, 21・・
Coil, 22A...electrode, 32...second partition member,
33... Main chamber, 34... Sub-chamber, 50, 50A... Magnetic fluid, 50B, 50C... Electrorheological fluid, 50D
··antifreeze.

Claims (2)

[Claims] (1) A main chamber and a sub-chamber that communicate with each other via an orifice are filled with liquid, and the upper end of the main chamber is closed with a thick rubber member.
In a liquid-filled engine mount device in which the bottom of an auxiliary chamber is closed with a flexible member, a liquid chamber formed within a wall of the rubber member, a magnetic fluid filled in the liquid chamber, and the liquid An engine mount device comprising an electromagnetic coil that generates a magnetic field in a chamber. (2) Filling a main chamber and a sub-chamber that communicate with each other via an orifice, and closing the upper end of the main chamber with a thick rubber member;
A liquid-filled engine mount device in which the bottom of an auxiliary chamber is closed with a flexible member, comprising: a liquid chamber formed within a wall of the rubber member; an electrorheological fluid filled in the liquid chamber; An engine mount device comprising: an electrode that generates an electric field in a liquid chamber;