JP2001003980A - Active vibration isolating support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an armature from making direct contact with a yoke and causing noises, without increasing an air gap between the yoke and the armature. 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. The shank 381 of an armature 38 driven by a coil 34 is supported by a pair of upper and lower elastic bodies 44, 47 in such a way as to be movable along an axis L. The armature 38 opposed to a yoke 32 is provided with stopper rubber 48 to prevent the yoke 32 and the armature 38 from making direct contact with each other and causing noises. Since the stopper rubber 48 is in the form of a cone, it performs the function of centering the armature 38 on the axis L by means of reaction which is generated by contact with the yoke 32.

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 attracting and driving a connected armature to a yoke 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.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in an active vibration isolator, the armature directly contacts the yoke to generate noise without increasing the air gap between the yoke and the armature. The purpose is to prevent

[0006]

According to the first aspect of the present invention, there is provided an elastic member receiving a load of a vibrating member, and the elastic member forms at least a part of a wall surface. A liquid chamber, a movable member that changes the volume of the liquid chamber, and an actuator that includes an actuator that attracts and drives an armature connected to the movable member to a yoke with an electromagnetic force generated by a coil, An active vibration isolation support device is proposed in which a stopper rubber is provided on one of the yoke and the armature to prevent the sucked armature from directly contacting the yoke.

According to the above construction, since the stopper rubber is provided on one of the yoke and the armature, even if the air gap between the yoke and the armature is set to be small in order to reduce the size of the coil and reduce power consumption, suction is performed. It is possible to prevent the generated armature from directly contacting the yoke and generating noise. Further, if the magnitude of the reaction force received from the yoke by the armature is adjusted by changing the hardness or shape of the stopper rubber, the characteristic of the amount of movement of the armature with respect to the current flowing through the coil can be set linearly.

According to the invention described in claim 2,
In addition to the configuration of claim 1, an active vibration isolating support device is proposed, wherein the stopper rubber has a conical surface so that the armature can be centered with respect to the axis along which the armature moves.

According to the above configuration, the armature contacts the yoke via the stopper rubber having the conical surface.
Deflection of the armature from the axis can be prevented by the centering effect of the conical surface.

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 present invention. Corresponds to the liquid chamber.

[0011]

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 6 show one 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.
1 is a sectional view taken along line 4-4 of FIG. 1, FIG. 5 is a sectional view taken along line 5-5 of FIG. 1, and FIG. 6 is an enlarged view of a main part of FIG.

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 with respect to 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.

The outer periphery of a second elastic member 18 formed of a film-like rubber is fixed to the inner periphery of the third orifice forming member 17 by vulcanization bonding. It is fixed by vulcanization bonding to a movable member 20 which is arranged so as to be vertically movable. 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.

[0020] 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. A yoke 32 is fixed to the actuator support member 30, and a coil 34 wound around a bobbin 33 is housed in a space formed inside the yoke 32. A columnar shaft 3 extending upward from the center of a disk-shaped armature 38 facing the lower surface of the coil 34
8 ₁ loosely fits into the through hole 32 ₁ passing through the center of the yoke 32.

A shaft 38 protruding upward from the through hole 32 _1
The bracket 42 fixed to ₁ and the bracket 43 fixed to the upper surface of the yoke 32 are connected by a disk-shaped upper elastic body 44. Also a bracket 45 fixed to the lower end of the shaft portion 38 _1, a bracket 46 fixed to the bottom plate 35 which closes the lower surface of the yoke 32 are connected by a disc-shaped lower elastic member 47. Thus, the shaft portion 38 ₁ of the armature 38 is floatingly supported by the upper elastic member 44 and the lower elastic member 47.

The armature 38 is urged upward by a coil spring 41 disposed between the armature 38 and the bottom plate 35, and the shaft 38
Spherical portion 38 ₂ formed on the upper end of the ₁ abuts to resiliently on the lower surface of the movable member 20. That is, the shaft 3 of the armature 38
8 ₁ and the movable member 20 are in point contact with each other at the contact portion P, and the swing and sliding of the movable member 20 with respect to the armature 38 are allowed. Coil 34 of actuator 29
Shaft part 38 ₁ of armature 38 when is in a demagnetized state
The elastic force of the coil spring 41 acts upward, the pressure of the liquid and the elastic force of the second elastic body 18 act downward, and the upper elastic body 44 and the lower elastic body 47
Are acting in the vertical direction, and stop at a neutral position where those loads are balanced.

[0023] A stopper surface 32 ₂ conical on the lower surface opening of the yoke 32 is formed, it conical stopper surface 3 formed on the outer periphery of the armature 38 so as to face
8 ₃ is covered with a rubber stopper 48. The air gap β is formed between the stopper face 32 ₂ of the conical stopper rubber 48 and the yoke 32. The apex of the conical stop face 32 _2, 38 ₃ is located on the axis L.

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 a non-operating 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 decreases and the hydraulic pressure increases, 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
The upper and lower ends of ₁ are supported by an upper elastic body 44 and a lower elastic body 47, respectively. Further, the two elastic bodies 44 and 47, which are disc-shaped, can be easily deformed in the direction of the axis L while being deformed in the radial direction. since it is difficult to, the shaft portion 38 ₁ of the armature 38 can be easily moved up and down is held in the correct position along the axis L. The stopper surface 3 of the yoke 32
2 ₂ the stopper rubber 48 on the stopper surface 38 ₃ of the opposite armature 38 is provided, the armature 38 is in contact said that both stopper surfaces 32 _2, 38 ₃ directly when it is sucked into the yoke 32 Noise Is prevented from being emitted. Thus it is possible to set small air gap β between the stopper face 32 ₂ and the stopper rubber 48 of the yoke 32, the coils 34 can save power consumption by downsizing to a necessary minimum.

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. Moreover, even when the shaft portion 38 ₁ of the armature 38 under the high unbalanced load is inclined from the axis L, since the shape of the contact surface of the stopper rubber 48 constitutes a part of a cone whose apex the axis L, the stopper rubber 48 the shaft 38 ₁ of the armature 38 can be automatically centered on the axis L by the reaction force received from the stopper surface 32 ₂ of the yoke 32.

Further, the load when the stopper rubber 48 is compressed changes nonlinearly with the amount of movement of the armature 38, and the suction force by which the coil 34 sucks the armature 38 is the size of the air gap (that is, the armature). (The amount of movement of the armature 38), the load and the attraction force are canceled out, and the characteristic of the amount of movement of the armature 38 with respect to the current flowing through the coil 34 can be set linearly.

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 damping support device M for supporting the engine E of the automobile has been exemplified. However, the active vibration damping support 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. In the embodiment, the stopper rubber 48 is connected to the armature 3.
It is provided on the 8 side stopper surface 38 _3, but can be provided it the stopper surface 32 ₂ of the yoke 32 side.

[0034]

As described above, according to the first aspect of the present invention, the stopper rubber is provided on one of the yoke and the armature, so that the yoke and the armature can be reduced in size to reduce the power consumption. Even if the air gap between them is set small, it is possible to prevent the sucked armature from directly contacting the yoke and generating noise. Also, by changing the hardness and shape of the stopper rubber and adjusting the magnitude of the reaction force that the armature receives from the yoke,
The characteristic of the amount of movement of the armature with respect to the current flowing through the coil can be set linearly.

According to the second aspect of the present invention,
Since the armature contacts the yoke via the stopper rubber having the conical surface, it is possible to prevent the armature from swinging from the axis by the centering effect of the conical surface.

[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 a sectional view taken along line 4-4 of FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 1;

FIG. 6 is an enlarged view of a main part of FIG. 1;

[Explanation of symbols]

 E engine (vibrating body) L axis 14 first elastic body (elastic body) 20 movable member 24 first liquid chamber (liquid chamber) 29 actuator 32 yoke 34 coil 38 armature 48 stopper rubber

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ken Iinuma 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside Honda R & D Co., Ltd. (72) Inventor Ken Watanabe 1-4-1 Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. (reference) 3D035 CA35 CA43 3J047 AA03 CA06 CB10 FA02

Claims (2)

[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). An actuator (29) for attracting and driving the armature (38) to the yoke (32) by the electromagnetic force generated by the coil (34), wherein the yoke (32) and the armature (32) are provided. 39. An active vibration isolating support device, wherein a stopper rubber (48) is provided on any one of (39) to prevent the sucked armature (38) from directly contacting the yoke (32). 2. The stop rubber (48) has a conical surface so that the armature (38) can be centered with respect to the axis (L) along which the armature (38) moves. 2. The active vibration isolation support device according to 1.