JP2839320B2 - Engine mounting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine mount device for mounting an automobile engine on a vehicle body.

(Prior art)

2. Description of the Related Art In recent years, automobiles have been required to have not only improved running performance but also improved comfort and quietness in a vehicle cabin. In an engine mounting device for mounting an engine on a vehicle body, which is one of the main factors of various vibrations and noises that reduce the comfort and quietness of a vehicle cabin, a rubber member is conventionally used as a cushioning member. Although a mount member is used, there is a limit in obtaining a predetermined vibration damping characteristic with respect to vibration from a low frequency region to a medium to high frequency region, so recently, a main chamber communicated with an orifice is used. A liquid is sealed in the sub-chamber and 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 to obtain excellent vibration damping characteristics. Liquid-filled engine mount devices have been put to practical use.

Further, in the above-described liquid-filled engine mount device, in order to easily realize vibration damping control according to various engine operating states and running states, for example, JP-A-63-1833.
JP-A No. 6-1980 proposes an engine mount device using a magnetic fluid capable of adjusting viscosity through a magnetic field as the liquid,
JP-A-63-158834 proposes an engine mount device using an ER fluid whose viscosity can be adjusted via an electric field as the liquid.

[Problems to be solved by the invention]

In the above liquid-filled engine mount device,
A large damping characteristic is obtained only for relatively low-frequency vibrations through the orifice. According to the device disclosed in the above publication, the damping coefficient in the damping characteristic is adjusted by adjusting the strength of the magnetic or electric field generated in the orifice. Can be adjusted.

By the way, when considering the dynamic spring constants of these engine mount devices, the dynamic spring constant of the rubber member is constant, and the dynamic spring constants of the components other than the rubber member fluctuate according to the strength of the magnetic field and electric field. It has a large value only for high-frequency vibration, and an extremely small value for low-medium frequency vibration.

In other words, the conventional engine mount device does not include any means for adjusting the dynamic spring constant of the rubber member, so that the dynamic spring constant of the entire engine mount device can be adjusted to a desired characteristic according to the operating state or running state of the engine. I couldn't adjust it.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid-filled engine mount device capable of changing a dynamic spring constant of a rubber member.

[Means for solving the problem]

In the engine mounting device according to the first aspect, the main chamber and the sub chamber communicated via the orifice are filled with liquid, the upper end of the main chamber is closed with a thick rubber member, and the lower part of the sub chamber is allowed to be closed. In a liquid-filled engine mount device closed by a flexible member, a liquid chamber formed in the wall of the rubber member, a magnetic fluid filled in the liquid chamber, and a magnetic field generated in the liquid chamber And a magnetic field coil.

In the engine mount device according to the second aspect, the main chamber and the sub chamber communicated through the orifice are filled with liquid, the upper end of the main chamber is closed with a thick rubber member, and the bottom of the sub chamber is flexible. In a liquid-filled engine mount device closed by an elastic member, a liquid chamber formed in a wall portion of the rubber member, an electrorheological fluid filled in the liquid chamber, and an electric field generated in the liquid chamber And an electrode.

[Operation] In the engine mount device according to the first aspect,
The liquid chamber formed in the wall of the rubber member is filled with a magnetic fluid, and an electromagnetic coil for generating a magnetic field is provided in the liquid chamber, so if the magnetic field acting on the magnetic fluid via the electromagnetic coil is weakened, When the viscosity of the magnetic fluid decreases, the dynamic spring constant of the rubber member decreases, and 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 increases.

As described above, the dynamic spring constant of the rubber member can be adjusted through the electromagnetic coil, so that the dynamic spring constant of the engine mount device can be freely changed so as to be adapted to the operating state and running state of the engine. .

In the engine mount device according to the second aspect,
When the strength of the electric field acting on the electrorheological fluid via the electrode is reduced in substantially the same manner as in the first aspect, the viscosity of the electrorheological fluid decreases, the dynamic spring constant of the rubber member decreases, and the strength of the electric field decreases. 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 via the electrodes, so that the dynamic spring constant of the engine mount device can be freely changed to suit the engine operating state or running state.

〔The invention's effect〕

According to the engine mount device of the first aspect, as described in the above section, by providing the liquid chamber filled with the magnetic fluid and the electromagnetic coil in the rubber member, the dynamic spring of the engine mount device is provided. The constant can be changed freely. For example, when the engine vibration in the low and middle frequency range becomes severe due to torque fluctuation such as sudden acceleration, the dynamic spring constant is controlled according to the engine operating condition and running condition, such as increasing the dynamic spring constant to suppress the vibration. It is possible to do.

According to the engine mount device of the second aspect, as described in the section of [Action], the rubber member is provided with the liquid chamber filled with the electrorheological fluid and the electrode. Similarly, 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 or running state.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

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

A dish-shaped lower wall member 11 is provided at a lower portion of the engine mount device 10, and a cylindrical side wall member 12 is formed on the lower wall member 11 at an upper portion of the lower wall member 11 by an annular groove 12a formed at a lower portion thereof. It is provided so as to be externally fitted and fixed to the formed annular flange portion 11a, and an expanded side wall portion 12b is formed on the upper side of the side wall member 12, and the side wall member 12 has a thick rubber rubber having a concave portion 13a. A mounting member 13 is fixed to the inner peripheral surface of the side wall portion 12b and is provided to protrude upward from the side wall member 12. The mounting member 14 having a cap portion 14a for transmitting vibration is provided in the mounting member 13 by recessing the cap portion 14a. The mounting member 13 is provided so as to be fitted inside and fixed to the upper end surface of the mounting member 13.

In the wall of the mounting member 13, four liquid chambers are provided.
20 are provided at predetermined intervals in the circumferential direction, and a space 30 is formed between the lower wall members 11 at the lower end of the mount member 13.

The engine mounting device 10 is fixed to the subframe 3 of the vehicle body 1 by a nut 4 with a screw portion 11b provided on the lower wall member 11, and the engine bracket 2 is
Are fixed and attached by bolts 15 and nuts 5 provided on the base. Reference numeral 16 is a mounting member.
13 is a stopper member provided inside.

 Next, each of the liquid chambers 20 will be described.

Each of the liquid chambers 20 is filled with a magnetic fluid 50 whose viscosity changes according to 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 22 around which a coil 21 for forming a substantially vertical magnetic field in the liquid chamber 20 is attached to a portion around the
Both ends of the coil 21 are connected to a voltage supply 24 via a lead wire 23.
It is connected to the. The current supply device 24 is connected to the controller 25, and the coil is supplied by a control signal from the controller 25.
It is controlled to supply an exciting current to 21. Signals from a vehicle speed sensor and an engine speed sensor are input to the controller 25, and the controller 25 includes a microcomputer or a programmable controller, and operates the engine based on the input from each sensor and a preset control program. A control signal corresponding to the state or the running state is output to the current supply device 24.

 Next, the space 30 will be described.

The space 30 is made of a metal member and has two orifice portions.
A first partition member 31 having a 40 and a second partition member 32 made of a flexible elastic member are partitioned into an upper main chamber 33, a middle sub chamber 34, and a lower air chamber 35. The second partition member 32 has its peripheral edge inserted and fixed in a gap portion 17 formed between the annular flange portion 11a of the lower wall member 11 and the annular groove portion 12a of the side wall member 12, and has a main chamber 33 and a sub chamber 34. Has the same magnetic fluid 50A
And air is sealed in the air chamber 35.

The above-mentioned orifice portions 40 will be described with reference to FIG. 2. A bobbin member 41 is mounted in a mounting hole 31a formed at one end of the first partition wall member 31, and an orifice is provided at the center of the bobbin member 41. 42 is formed through it.

The orifice 42 is formed of a steel thin tube 42a, and coils 43 are wound around the upper and lower ends of the thin tube 42a concentrically with the orifice 42, and each end of each coil 43 is a lead wire.
Connected to the current supply 24 via 44 and the controller 25
The current supply device 24 supplies an exciting current to the coil 43 according to a control signal according to the operating state or running state of the engine output from the motor.

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

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

Then, the viscosity of the magnetic fluid 50 becomes high, medium and low in accordance with the strength of the magnetic field applied to the liquid chamber 20 by the coil 21.Therefore, the damping coefficient and the dynamic spring constant of the magnetic fluid 50 and the mount member 13 are respectively As shown in FIG. 5 and FIG. In addition, magnetic fluid
Although 50 is incompressible, the viscosity of the magnetic fluid 50 affects the dynamic spring constant of the mount member 13 because the magnetic fluid 50 flows in the liquid chamber 20 when the mount member 13 is elastically deformed. It exerts

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, it is possible to freely adjust the damping coefficient and the dynamic spring constant of the engine mount device 10, respectively.

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-idle vibration. In this case, orifice 42
The magnetic field of the liquid chamber 20 may be reduced and the magnetic field of the liquid chamber 20 may be reduced.

At the time of rapid acceleration, the engine torque changes suddenly, so the engine vibration becomes severe in the low frequency vibration region, and the engine tilts around the torque roll axis.To make this tilt gentle, increase the damping coefficient and reduce the engine vibration. It is desirable to increase the dynamic spring constant in order to suppress. In this case, the magnetic field of the orifice 42 and the magnetic field of the liquid chamber 20 may be increased.

Further, during steady running, vehicle body vibration and muffled noise in the vehicle cabin are generated in the middle and high frequency vibration region due to engine vibration. Therefore, in order to reliably absorb engine vibration, the damping coefficient is reduced and the dynamic spring constant is reduced. It is desirable. In this case, the magnetic field of the orifice 42 is weakened and the liquid chamber
We need to weaken the 20 magnetic fields.

Second Embodiment Next, a second embodiment will be described. However, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The engine mount device 10A of the present embodiment is made of a material in which a dielectric such as silicic acid and an organic substance is dispersed with a dispersant using, for example, water as a solvent, instead of the magnetic fluids 50 and 50A of the above-described embodiment. Electro-rheological fluid 50 with adjustable viscosity
B ・ 50C was used.

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

In order to form an electric field in each of the liquid chambers 20A, electrodes 22A are provided on the upper wall and the lower wall of each liquid chamber 20A, and each of the electrodes 22A is connected to a current supply device 24A via a lead wire 23A. I have.
The current supply device 24A is connected to the controller 25A, and supplies a voltage to each electrode 22A according to a control signal from the controller 25A. The orifice portion 40A of the first partition wall member 31 is provided with an electrode member 41A having a pair of electrodes 42b disposed opposite to each other with the orifice 42 interposed therebetween as shown in FIG. Is connected to the current supply device 24A via a lead wire 44A. Reference numeral 25A is a controller.

The strength of the electric field in the liquid chamber 20A and the orifice 42 becomes strong, medium, and weak in accordance with the magnitude of the voltage applied to the electrodes 22A and 42b, and the viscosity of the electrorheological fluids 50B and 50C increases in the strength of the electric field. High, medium, and low are adjusted according to the middle and low levels. Accordingly, by changing the strength of the electric field of the liquid chamber 20A and the electric field of the orifice 42 in various combinations, the damping coefficient and the dynamic spring constant of the engine mounting device 10A can be freely adjusted according to the operating state and running state of the engine, respectively. I can do it. Instead of the four liquid chambers 20A, one liquid chamber may be formed in the wall of the mount member 13 in a return shape.

Third Embodiment Next, a third embodiment will be described. However, the first
The same members as those in the embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 9, the engine mounting device 10B of the present embodiment is the same as the engine mounting device 10 of the first embodiment.
First having a variable orifice portion 40B instead of the partition member 31
A partition member 31A is provided, and an antifreeze 50D such as ethylene glycol is sealed in the main chamber 33 and the sub-chamber 34 instead of the magnetic fluid 50A.

The variable orifice portion 40B has an orifice member 40a having an orifice 42c fixed to a mounting hole 31b formed in the center of the first partition wall member 31A, and an orifice 42d slidably fitted in the orifice member 40a. Member 40d
The orifice 42c and the orifice 42d constitute a variable orifice 42A.

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

That is, the solenoid 61 disposed in the concave portion 13a of the mount member 13 is fixed to the cap portion 14a, the output rod 61a of the solenoid 61 extends through the mount member 13 toward the main chamber 33, and the lower end thereof has an orifice member 40b. Is fixed to the outer periphery of the upper end of the. Further, between the upper end of the orifice member 40b and the receiving member 62 fixed to the lower end of the mount member 13, a compression coil spring 63 for urging the orifice member 40b downward is provided on the output rod 61a.

The solenoid 6 is connected to a current supply device 24B via a lead wire 64, and the current supply device 24B is connected to a controller 25B.
An excitation current is supplied to the solenoid 61 on the basis of a control signal output from the controller and the height direction position of the orifice member 40b is adjusted to control the orifice length of the orifice 42A composed of the orifices 42c and 42d.

According to the length of the orifice 42A, the damping coefficient of the antifreeze 50D flowing through the orifice 42A is as shown in FIG. 10, and the antifreeze 50D flowing through the orifice 42A and the second
The dynamic spring constant of the partition member 32 and the like is as shown in FIG.

The damping coefficients and the dynamic spring constants of the magnetic fluid 50 and the mount member 13 are as shown in FIGS. 12 and 13, respectively, according to the intensity of the magnetic field applied to the liquid chamber 20 by the coil 21.

Therefore, by changing the length of the orifice 42A and the strength of the magnetic field of the liquid chamber 20 in various combinations, the damping coefficient and the dynamic spring constant of the engine mount device 10B can be freely changed according to the operating state and running state of the engine, respectively. Can be adjusted. Instead of the liquid chamber 20, a liquid chamber filled with an electrorheological fluid and electrodes may be provided.

[Brief description of the drawings]

1 to 13 show an embodiment of the present invention. FIG. 1 is a sectional view of an engine mount device according to the first embodiment, FIG. 2 is an enlarged view of an orifice portion of the device, FIG. The figure shows the characteristics of the damping coefficients of the main and sub chambers of the device, FIG. 4 shows the characteristics of the dynamic spring constants of the main and sub chambers of the device, and FIG. FIG. 6 is a characteristic diagram of a damping coefficient, FIG. 6 is a characteristic diagram of a dynamic spring constant of a mount member and a liquid chamber of the device, FIG. 7 is a sectional view of an engine mount device according to a second embodiment, and FIG. FIG. 9 is an enlarged view of an orifice portion, FIG. 9 is a cross-sectional view of an engine mount device according to a third embodiment, FIG. 10 is a characteristic diagram of a damping coefficient of a main chamber and a sub-chamber of the device, and FIG. Fig. 12 is a characteristic diagram of the dynamic spring constants of the chamber and sub-chamber, Fig. 12 is a characteristic diagram of the damping coefficient of the mounting member of the device and the liquid chamber, and Fig. 13 is a characteristic diagram of the mounting member and the liquid chamber of the device. It is a characteristic view of a dynamic spring constant. 10 · 10A · 10B ··· Engine mount device, 13 ··· Mount member, 20 · 20A ··· Liquid chamber, 21 ··· Coil, 22A ··· Electrode, 32 ···· Second partition member, 33 ··· Main chamber, 34 …… Secondary room, 50
・ 50A …… magnetic fluid, 50B ・ 50C …… electrorheological fluid, 50D…
…antifreeze.

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16F 13/00

Claims (2)

(57) [Claims] A liquid is filled in a main chamber and a sub-chamber which are communicated via an orifice, an upper end of the main chamber is closed by a thick rubber member, and a bottom of the sub-chamber is closed by a flexible member. A liquid-filled engine mount device comprising: a liquid chamber formed in a wall portion of the rubber member; a magnetic fluid filled in the liquid chamber; and an electromagnetic coil for generating a magnetic field in the liquid chamber. An engine mount device, characterized in that: 2. A liquid is filled in the main chamber and the sub-chamber which are communicated via the orifice, the upper end of the main chamber is closed with a thick rubber member, and the bottom of the sub-chamber is closed with a flexible member. A liquid-filled engine mount device comprising: a liquid chamber formed in a wall portion of the rubber member; an electrorheological fluid filled in the liquid chamber; and an electrode for generating an electric field in the liquid chamber. An engine mount device, characterized in that: