JP2001003981A - Active vibration isolating support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption without reducing the durability of an actuator which drives a movable member. SOLUTION: This active vibration isolating support device M for preventing transmission of vibration from an engine E to a vehicle body frame F has an electromagnetic actuator 29 which drives a movable member 20 to reciprocate it thus varying the volume of a liquid chamber 24. Because the shank 381 of an armature 38 driven by a coil 34 is supported by a bearing 36 in such a way as to be movable along an axis L, the coil 34 can be miniaturized with an air gap β minimized. Because the shank 381 of the armature 38 and the movable member 20 make point contact with each other at a contact portion P, deflection of the movable member 20 is prevented from being directly transmitted to the shank 381 of the armature 38, whereby the durability of the bearing 36 can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic body receiving a load of a vibrating body, a liquid chamber in which the elastic body forms at least a part of a wall, a movable member for changing the volume of the liquid chamber, and a movable member. The present invention relates to an active vibration isolating support device including an actuator for driving a connected armature by an electromagnetic force generated by a coil.

[0002]

2. Description of the Related Art Such an active vibration isolating support device is disclosed in
It is known from JP-A-1101071.

In this active vibration isolating support device, a movable member for changing the volume of the liquid chamber is constituted by a disc-shaped leaf spring having an outer peripheral portion fixed to a case, and is driven by a coil of an actuator. The armature has no special bearing and is directly fixed and supported on the lower surface of the central part of the movable member. Then, the armature is attracted by the excitation of the coil, and the movable member integrated with the armature is reciprocated in the direction along the axis.

[0004]

In the above-mentioned conventional active vibration damping support device, when the movable member for changing the volume of the liquid chamber is deviated from the axis by an uneven load received from the liquid in the liquid chamber, the armature is supported by the bearing. , The armature integral with the movable member also tilts with respect to the axis. Therefore, it is necessary to set a large air gap so as not to contact the yoke even when the armature is tilted, and as a result, the characteristics of the magnetic circuit deteriorate. To solve this problem, the size of the coil may be increased to increase the magnetic force that can be generated, but this will increase the power consumption of the coil.

Therefore, it is conceivable that the armature is supported by bearings so as to move along the axis, thereby avoiding contact with the yoke due to the inclination of the armature. Prying occurs between the armature and the bearing, causing a problem that the bearing is worn early and the durability of the actuator is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the power consumption of an active vibration isolation support device without reducing the durability of an actuator for driving a movable member. .

[0007]

According to the first aspect of the present invention, there is provided an elastic body receiving a load of a vibrating body, and the elastic body forms at least a part of a wall surface. An armature supported by a bearing in an active vibration isolation support device including a liquid chamber, a movable member that changes the volume of the liquid chamber, and an actuator that drives an armature connected to the movable member with an electromagnetic force generated by a coil. And the movable member are brought into contact with the contact portion so as to be relatively displaceable,
An active-type anti-vibration support device is proposed in which the armature attracted by the excited coil is driven by pressing the movable member at the contact portion.

According to the above configuration, since the armature of the actuator is supported by the bearings, it is possible to prevent the armature from oscillating and to set the air gap of the actuator to an optimum size. Electric power can be reduced. Moreover, since the armature and the movable member are brought into relative contact with each other at the contact part, even if the movable member oscillates due to the load received from the liquid chamber, the oscillation is not transmitted directly to the armature, causing uneven wear of the bearing. Can be prevented, and the durability and reliability of the actuator can be improved. Also, since the armature is driven by pressing the movable member at the contact part,
The armature can be prevented from separating from the movable member, and the movable member can be reliably driven.

The engine E of the embodiment corresponds to the vibrating body of the present invention, the first elastic body 14 of the embodiment corresponds to the elastic body of the present invention, and the first liquid chamber 24 of the embodiment corresponds to the vibrating body of the present invention. Corresponds to the liquid chamber.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an active vibration isolating support device, and FIG.
3 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG.
FIG. 2 is an enlarged view of a main part of FIG. 1.

An active vibration isolating support device M shown in FIGS.
Is for elastically supporting the engine E of the automobile on the body frame F, and detects an engine speed sensor S ₁ for detecting the engine speed and a load inputted to the active vibration isolator M. a load sensor S ₂ for an acceleration sensor S ₃ for detecting the acceleration acting on the engine E is controlled by the connected electronic control unit U.

The active vibration isolator M has a structure substantially symmetrical about the axis L. The inner cylinder 12 is welded to a plate-like mounting bracket 11 connected to the engine E.
And an outer cylinder 13 coaxially arranged on the outer periphery of the inner cylinder 12. The upper and lower ends of a first elastic body 14 formed of thick rubber are provided on the inner cylinder 12 and the outer cylinder 13, respectively. Are bonded by vulcanization adhesion. A first orifice forming member 15 disc-shaped having an opening 15 ₂ in the center, a second orifice-forming member 16 which is formed in an annular shape having a top surface and a gutter-shaped cross section opening, also has an upper surface opened gutter A third orifice forming member 17 having an annular cross section and formed in an annular shape is integrated by welding, and the outer peripheral portions of the first orifice forming member 15 and the second orifice forming member 16 are overlapped with each other to form the outer portion. It is fixed to the caulking portion 13 ₁ which is provided in the lower portion of the tube 13.

An outer periphery of a second elastic body 18 formed of a film-like rubber is fixed to an inner periphery of the third orifice forming member 17 by vulcanization bonding, and an inner periphery of the second elastic body 18 has an axis L. It is fixed by vulcanization bonding to a movable member 20 which is disposed so as to be able to move up and down. The outer periphery of the outer tube 13 of the caulking portion 13 diaphragm 22 to the ring member 21 fixed to ₁ is fixed by vulcanization adhesion, the inner periphery of the diaphragm 22 is fixed by vulcanization adhesion to the movable member 20 .

Thus, a first liquid chamber 24 filled with liquid is defined between the first elastic body 14 and the second elastic body 18, and a first liquid chamber 24 filled with liquid between the second elastic body 18 and the diaphragm 22 is formed. A two-liquid chamber 25 is defined. The first liquid chamber 24 and the second liquid chamber 25 are provided with the first to third orifice forming members 1.
The upper orifice 26 and the lower orifice 27 formed by 5, 16, 17 communicate with each other.

The upper orifice 26 forms a first orifice.
Formed between the member 15 and the second orifice forming member 16
Is a ring-shaped passage which is provided in a part thereof.
6₁On one side communicates with the first orifice forming member 15
Hole 15₁Is formed, and the partition 26 is formed.₁On the other side of
2 orifice forming member 16 with communication hole 16₁Is formed
You. Therefore, the upper orifice 26 has the first orifice shape.
Communication hole 15 of component member 15 ₁To the second orifice forming member
16 communication holes 16₁Formed over a range of approximately one round up to
(See FIG. 2).

The lower orifice 27 is an annular passage formed between the second orifice forming member 16 and the third orifice forming member 17, and a partition wall 2 provided in a part thereof is provided.
In one side of ₇₁ the communication hole 16 ₁ in the second orifice-forming member 16 is formed, the communication hole 17 ₁ is formed in the third orifice-forming member 17 at the other side of the partition wall 27 _1. Accordingly, the lower orifice 27 is formed over substantially one round in the range of the communication hole 16 ₁ of the second orifice-forming member 16 to the communicating hole 17 ₁ of the third orifice-forming member 17 (see FIG. 3).

From the above, the first liquid chamber 24 and the second
The liquid chamber 25 communicates with each other by an upper orifice 26 and a lower orifice 27 connected in series.

[0019] caulked portion 13 ₁ of the outer cylinder 13, an annular mounting bracket 28 for fixing the active vibration isolation support system M to the vehicle body frame F is fixed, the a lower surface of the mounting bracket 28 An actuator support member 30 for supporting an actuator 29 for driving the movable member 20 is welded.

The yoke 3 is mounted on the actuator support member 30.
2 is fixed, and the coil 34 wound around the bobbin 33 is accommodated in a space formed inside the yoke 32. Supporting hole 32 ₁ in a cylindrical bearing 36 which passes through the center of the yoke 32 is fitted and fixed. Coil 34
Shaft portion 38 from the center of the disc-shaped armature 38 which faces the lower surface of the columnar extending upwardly _1, the bearing 36
Is supported slidably up and down.

The armature 38 is fixed to the lower surface of the yoke 32.
Upward with a coil spring 41 arranged between the bottom plate 35
The shaft 38₁Spherical portion 38 formed at the upper end of
_TwoResiliently contacts the lower surface of the movable member 20. That is,
-Shaft part 38 of mature 38₁And the movable member 20 is a contact portion
Point contact with each other at P
Swinging and sliding of the movable member 20 are allowed. Actu
Armor when the coil 34 of the eta 29 is in the demagnetized state
Shaft portion 38 of ture 38₁The spring force of the coil spring 41
Acts upward, and the pressure of the liquid and the second
The elasticity of the sexual body 18 is acting downward,
It stops at the neutral position where the directional forces are balanced. This state
And a conical storage formed at the opening on the lower surface of the yoke 32.
Face 32 _TwoAnd armature 38 to face it
Conical stopper surface 38 formed on the outer periphery of_ThreeBetween
An air gap β is formed.

When a low-frequency engine shake vibration occurs while the automobile is running, the first elastic body 14 is deformed by the load input from the engine E and the volume of the first liquid chamber 24 changes. , A first liquid chamber 24 and a second liquid chamber 24 connected via an upper orifice 26 and a lower orifice 27.
Liquid flows between the liquid chambers 25. As the volume of the first liquid chamber 24 increases or decreases, the volume of the second liquid chamber 25 decreases or expands accordingly. However, the change in the volume of the second liquid chamber 25 is absorbed by the elastic deformation of the diaphragm 22. At this time,
The shapes and dimensions of the upper orifice 26 and the lower orifice 27 and the spring constant of the first elastic body 14 are set so as to exhibit a high spring constant and a high damping force in the frequency range of the engine shake vibration. Vibration transmitted to the body frame F can be effectively reduced.

In the frequency range of the engine shake vibration, the actuator 29 is kept in an inactive state.

When vibration having a frequency higher than that of the engine shake vibration, that is, idle vibration or muffled vibration caused by rotation of the crankshaft of the engine E occurs,
Since the liquid in the upper orifice 26 and the lower orifice 27 connecting the first liquid chamber 24 and the second liquid chamber 25 becomes a stick state and cannot exhibit the vibration-proof function, the actuator 29 is driven to exhibit the vibration-proof function. Let it.

The electronic control unit U controls energization of the coil 34 of the actuator 29 based on signals from the engine speed sensor S ₁ , load sensor S ₂ and acceleration sensor S ₃ . Specifically, when the engine E is deflected upward due to vibration and the volume of the first liquid chamber 24 increases and the hydraulic pressure decreases, the coil 34 is excited to attract the armature 38. As a result, the armature 38 presses the movable member 20 in the axial portion 38 ₁ of the upper end of the spherical portion 38 ₂ moves upward, to deform the second elastic body 18 connected to the inner periphery to the movable member 20 upward . Thereby, the first liquid chamber 2
In order to suppress a decrease in the fluid pressure due to a decrease in the volume of 4, the active vibration isolation support device M generates an active support force for preventing an upward load transmission from the engine E to the vehicle body frame F.

Conversely, when the engine E is deflected downward due to vibration and the volume of the first liquid chamber 24 is reduced and the hydraulic pressure is increased, the coil 34 is demagnetized and the suction of the armature 38 is released. As a result, the movable member 2 that moves downward by hydraulic pressure
The armature 38 pressed to 0 moves downward against the resilience of the coil spring 41, and the second elastic body 18 having an inner periphery connected to the movable member 20 deforms downward. This allows
Since the volume of the first liquid chamber 24 increases to suppress the increase in the hydraulic pressure, the active vibration isolation support device M generates an active supporting force for preventing downward load transmission from the engine E to the body frame F. I do.

The armature 38 which reciprocates in the vertical direction during the operation of the actuator 29 has its shaft 38
_{Since 1} is slidably supported by the bearing 36 fixed to the yoke 32, it is held in a correct posture along the axis L without swinging in the left-right direction. Therefore, the air gap β between the armature 38 and the yoke 2 can be set small, and the coil 34 can be made as small as possible to reduce power consumption.

When the movable member 20 reciprocates in the vertical direction, the second elastic body 18 and the diaphragm 22 are inclined in the direction of the arrow in FIG. since the shaft portion 38 ₁ of the armature 38 is displaceable relative to the point contact at the contact portion P, the movable member 20
Can swing freely without affecting the armature 38. Thereby, the deflection of the movable member 20 is not transmitted directly to the armature 38, to prevent wear of the bearing 36 supporting the shaft portion 38 ₁ of the armature 38 can be enhanced durability and reliability of the actuator 29.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the active vibration isolating support device M for supporting the engine E of the automobile has been exemplified. However, the active vibration isolating supporting device of the present invention is applied to support other vibrating bodies such as machine tools. be able to. If it is not necessary to reduce the vibration in the engine shake area by the active vibration isolator M, the second liquid chamber 25, the upper orifice 26, the lower orifice 27, and the diaphragm 22 can be omitted.

[0031]

As described above, according to the first aspect of the present invention, since the armature of the actuator is supported by the bearing, the swing of the armature is prevented, and the air gap of the actuator is set to an optimum size. It is possible to reduce the size of the coil and reduce power consumption. Moreover, since the armature and the movable member are brought into relative contact with each other at the contact part, even if the movable member oscillates due to the load received from the liquid chamber, the oscillation is not transmitted directly to the armature, causing uneven wear of the bearing. Can be prevented, and the durability and reliability of the actuator can be improved. Further, since the armature is driven by pressing the movable member at the contact portion, it is possible to prevent the armature from separating from the movable member and to reliably drive the movable member.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an active vibration isolation support device.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 1;

[Explanation of symbols]

 E engine (vibrating body) P contact part 14 first elastic body (elastic body) 20 movable member 24 first liquid chamber (liquid chamber) 29 actuator 34 coil 36 bearing 38 armature

Continuing from the front page (72) Inventor Tetsuo Mikasa 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside of Honda R & D Co., Ltd. (72) Inventor Tsutomu Ogawa 1-4-1 Chuo, Wako-shi, Saitama Co., Ltd. Inside of Honda R & D Co., Ltd. (72) Inventor Ken Iinuma 1-4-1 Chuo, Wako-shi, Saitama Co., Ltd. Inside Honda R & D Co., Ltd. (72) Inventor Ken Watanabe 1-4-1 Chuo, Wako-shi, Saitama Co., Ltd. Honda R & D F-term (reference) 3D035 CA08 CA27 CA35 3J047 AA03 CA06 CB10 FA02

Claims (1)

[Claims] An elastic body (1) receiving a load of a vibrating body (E)
4), a liquid chamber (24) in which the elastic body (14) forms at least a part of a wall surface, a movable member (20) for changing the volume of the liquid chamber (24), and a movable member (20). And an actuator (29) for driving the armature (38) with an electromagnetic force generated by the coil (34), the armature (3) supported by a bearing (36).
The armature (38) attracted by the excited coil (34) is brought into contact with the movable member (20) at the contact portion (P) so as to be relatively displaceable.
An active vibration isolation support device characterized by being driven by pressing 0).