JP3706769B2 - Active anti-vibration support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The coil includes an elastic body that receives a load of a vibrating body, a liquid chamber in which the elastic body forms at least a part of a wall surface, a movable member that changes the volume of the liquid chamber, and an armature connected to the movable member. The present invention relates to an active vibration isolating support device including an actuator that is driven by being attracted to a yoke by generated electromagnetic force.
[0002]
[Prior art]
Such an active vibration isolating support device is known from JP-A-10-110771.
[0003]
In this active type anti-vibration support device, the movable member that changes the volume of the liquid chamber is composed of a disc-shaped plate spring whose outer peripheral portion is fixed to the case, and the armature driven by the coil of the actuator is special. Without having a bearing, it is directly fixed and supported on the lower surface of the central portion of the movable member. The armature is attracted by the excitation of the coil, and the movable member integrally coupled with the armature is reciprocated in the direction along the axis.
[0004]
[Problems to be solved by the invention]
By the way, the above-described conventional active vibration isolating support device is movable because the armature is not supported by the bearing when the movable member that changes the volume of the liquid chamber deviates from the axis due to the bias load received from the liquid in the liquid chamber. The armature integrated with the member is also inclined with respect to the axis. Therefore, it is necessary to set a large air gap so that the armature does not come into contact with the yoke even if the armature is tilted. As a result, the characteristics of the magnetic circuit are deteriorated. In order to solve this problem, it is only necessary to increase the magnetic force that can be generated by enlarging the coil, but if this is done, the power consumption of the coil will increase.
[0005]
The present invention has been made in view of the foregoing circumstances, and in an active vibration isolating support device, prevents the armature from directly contacting the yoke and generating noise without increasing the air gap between the yoke and the armature. The purpose is to do.
[0006]
[Means for Solving the Problems]
To achieve the above object, according to the first aspect of the present invention, an elastic body that receives the load of the vibrating body, a liquid chamber in which the elastic body forms at least a part of the wall surface, and a volume of the liquid chamber In an active vibration isolating support device including a movable member to be changed and an actuator for attracting and driving an armature connected to the movable member by an electromagnetic force generated by a coil to the yoke , the yoke and the armature move the armature Each has a conical stopper surface centered on the axis, and both conical stopper surfaces are opposed to each other , and either one of the yoke and armature has a conical stopper surface. active vibration isolation support system is Hisage characterized in that the stopper rubber is provided in engagement with the conical stopper surface to prevent direct mutual contact of the armature and the yoke It is.
[0007]
According to the above configuration, the stopper rubber for preventing the direct contact between the armature and the yoke is provided on one of the conical stopper surfaces of the yoke and the armature to engage with the other conical stopper surface . Therefore, even if the air gap between the yoke and the armature is set small so as to reduce the power consumption by reducing the size of the coil, it is possible to prevent the attracted armature from directly contacting the yoke and generating noise. Further, if the magnitude of the reaction force received by the armature from the yoke is adjusted by changing the hardness and shape of the stopper rubber, the characteristic of the armature movement amount with respect to the coil current can be set linearly.
[0008]
Since the conical stop face of the armature and the yoke through the scan Toppagomu are in contact with each other, it is possible to prevent the armature that swings from the axis by a centering effect of the conical stopper surface.
[0009]
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 liquid chamber of the present invention. Correspond.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
1 to 6 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an active vibration isolating support device, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and 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, and FIG. 6 is an enlarged view of a main part of FIG.
[0011]
The active vibration-proof support device M shown in FIGS. 1 to 6 is for elastically supporting an engine E of a vehicle on a body frame F, and includes an engine speed sensor S ₁ for detecting the engine speed, It is controlled by an electronic control unit U to which a load sensor S ₂ for detecting a load input to the active vibration isolating support device M and an acceleration sensor S ₃ for detecting an acceleration acting on the engine E are connected.
[0012]
The active vibration isolating support device M has a substantially axisymmetric structure with respect to the axis L, and has an inner cylinder 12 welded to a plate-like mounting bracket 11 coupled to the engine E, and an outer periphery of the inner cylinder 12. The outer cylinder 13 is coaxially arranged, and the upper and lower ends of the first elastic body 14 made of thick rubber are joined to the inner cylinder 12 and the outer cylinder 13 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 a circular cross section and formed in an annular shape is integrated by welding, and the outer circumferences of the first orifice forming member 15 and the second orifice forming member 16 are overlapped to overlap the outer surface. It is fixed to the caulking portion 13 ₁ which is provided in the lower portion of the tube 13.
[0013]
The outer periphery of the second elastic body 18 formed of film-like rubber is fixed to the inner periphery of the third orifice forming member 17 by vulcanization adhesion, and the inner periphery of the second elastic body 18 is vertically moved on the axis L. The movable member 20 is movably disposed and fixed by vulcanization adhesion. 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 .
[0014]
Thus, a first liquid chamber 24 in which a liquid is sealed is defined between the first elastic body 14 and the second elastic body 18, and a second liquid chamber in which a liquid is sealed between the second elastic body 18 and the diaphragm 22. 25 is defined. The first liquid chamber 24 and the second liquid chamber 25 communicate with each other through the upper orifice 26 and the lower orifice 27 formed by the first to third orifice forming members 15, 16, and 17.
[0015]
The upper orifice 26 a passage annular formed between the first orifice-forming member 15 and the second orifice-forming member 16, the first orifice-forming member 15 on one side of the partition wall 26 ₁ provided in a part thereof communication hole 15 ₁ is formed, the communication hole 16 ₁ is formed in the second orifice-forming member 16 at the other side of the partition wall 26 _1. Therefore, the upper orifice 26 is formed over substantially one round in the range of the communicating hole 15 ₁ of the first orifice-forming member 15 to the communicating hole 16 ₁ of the second orifice-forming member 16 (see FIG. 2).
[0016]
The lower orifice 27 a passage annular formed between the second orifice-forming member 16 and the third orifice-forming member 17, the second orifice-forming member 16 on one side of the partition wall 27 ₁ provided in a part thereof the communication hole 16 ₁ 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).
[0017]
From the above, the first liquid chamber 24 and the second liquid chamber 25 communicate with each other by the upper orifice 26 and the lower orifice 27 connected in series.
[0018]
The 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 movable member 20 to the lower surface of the mounting bracket 28 The actuator support member 30 that supports the actuator 29 for driving the motor is welded. A yoke 32 is fixed to the actuator support member 30, and a coil 34 wound around the bobbin 33 is accommodated in a space formed inside the yoke 32. A columnar shaft portion 38 ₁ extending upward from the center of the disk-shaped armature 38 facing the lower surface of the coil 34 is loosely fitted into a through hole 32 ₁ penetrating the center of the yoke 32.
[0019]
A bracket 42 fixed to the shaft portion 38 ₁ protruding upward from the through hole 32 ₁ and a bracket 43 fixed to the upper surface of the yoke 32 are connected by a disk-shaped upper elastic body 44. A bracket 45 fixed to the lower end of the shaft portion 38 ₁ and a bracket 46 fixed to the bottom plate 35 that closes the lower surface of the yoke 32 are connected by a disk-like lower elastic body 47. Accordingly, the shaft portion 38 ₁ of the armature 38 is floatingly supported by the upper elastic body 44 and the lower elastic body 47.
[0020]
The armature 38 is biased upward by a coil spring 41 disposed between the armature 38 and the spherical portion 38 ₂ formed at the upper end of the shaft portion 38 ₁ elastically abuts against the lower surface of the movable member 20. That is, the shaft portion 38 ₁ of the armature 38 and the movable member 20 are in point contact with each other at the contact portion P, and swinging and sliding of the movable member 20 with respect to the armature 38 are allowed. The elastic force of the coil spring 41 acts upward on the shaft portion 38 ₁ of the armature 38 when the coil 34 of the actuator 29 is in a demagnetized state, and the pressure of the liquid and the elastic force of the second elastic body 18 are also applied. It acts downward, and the set load of the upper elastic body 44 and the lower elastic body 47 acts in the vertical direction, and it stops at the neutral position where these loads are balanced.
[0021]
Yoke 32 has a conical stop surface 32 ₂ to a lower surface opening is formed of, it stopper surface 38 ₃ conical formed on the outer periphery of the armature 38 so as to face is covered by the stopper rubber 48. An air gap β is formed between the conical stopper rubber 48 and the stopper surface 32 ₂ of the yoke 32. The apexes of the conical stopper surfaces 32 ₂ and 38 ₃ are located on the axis L.
[0022]
Thus, when low-frequency engine shake vibration is generated while the automobile is running, the first orifice 14 is deformed by the load input from the engine E and the volume of the first liquid chamber 24 is changed. The liquid flows back and forth between the first liquid chamber 24 and the second liquid chamber 25 connected via the H. 26 and the lower orifice 27. When the volume of the first liquid chamber 24 is enlarged / reduced, the volume of the second liquid chamber 25 is reduced / expanded accordingly, but the volume change of the second liquid chamber 25 is absorbed by the elastic deformation of the diaphragm 22. At this time, the shape and size 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 region of the engine shake vibration. Vibration transmitted from the engine E to the vehicle body frame F can be effectively reduced.
[0023]
In the frequency region of the engine shake vibration, the actuator 29 is kept in an inoperative state.
[0024]
When vibration having a frequency higher than the engine shake vibration, that is, idle vibration or booming sound vibration caused by rotation of the crankshaft of the engine E occurs, the upper orifice 26 connecting the first liquid chamber 24 and the second liquid chamber 25. Since the liquid in the lower orifice 27 is in a stick state and cannot exhibit the anti-vibration function, the actuator 29 is driven to exhibit the anti-vibration function.
[0025]
The electronic control unit U controls energization to the coil 34 of the actuator 29 based on signals from the engine speed sensor S ₁ , the load sensor S ₂ and the acceleration sensor S ₃ . Specifically, when the engine E is biased upward by vibration and the volume of the first fluid chamber 24 increases and the fluid pressure decreases, the coil 34 is excited to attract the armature 38. As a result, the armature 38 moves upward, presses the movable member 20 with the spherical portion 38 ₂ at the upper end of the shaft portion 38 ₁ , and deforms the second elastic body 18 whose inner periphery is connected to the movable member 20 upward. . As a result, since the volume of the first fluid chamber 24 is reduced and the decrease in fluid pressure is suppressed, the active vibration isolating support device M is an active support that prevents upward load transmission from the engine E to the vehicle body frame F. Generate power. On the other hand, when the engine E is biased 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 armature 38 pressed by the movable member 20 that moves downward by the hydraulic pressure moves downward against the elastic force of the coil spring 41, and the second elastic body connected to the movable member 20 at the inner periphery. 18 is deformed downward. As a result, since the volume of the first fluid chamber 24 is increased and the increase in fluid pressure is suppressed, the active vibration isolating support device M is an active support that prevents downward load transmission from the engine E to the vehicle body frame F. Generate power.
[0026]
Now, the armature 38 to reciprocate in the vertical direction during operation of the actuator 29, its upper and lower ends of the shaft portion 38 ₁ is supported by the upper elastic member 44 and the lower elastic member 47, respectively, moreover discoid both The elastic bodies 44 and 47 can be easily deformed in the direction of the axis L but hardly deformed in the radial direction. Therefore, the shaft portion 38 ₁ of the armature 38 is held in a correct posture along the axis L and can easily move up and down. Can do. Since the stopper rubber 38 is provided on the stopper surface 38 ₃ of the armature 38 facing the stopper surface 32 ₂ of the yoke 32, both the stopper surfaces 32 ₂ , 38 ₃ are used when the armature 38 is attracted to the yoke 32. Is prevented from making noise by direct contact. Therefore, the air gap β between the stopper surface 32 _{2 of the} yoke 32 and the stopper rubber 48 can be set small, and the coil 34 can be miniaturized to the minimum necessary to reduce power consumption.
[0027]
Further, when the movable member 20 reciprocates in the vertical direction, even if the second elastic body 18 or the diaphragm 22 receives a laterally offset load from the liquid and tilts in the direction of the arrow in FIG. Since the shaft portion 38 ₁ is in point contact with the contact portion P so as to be relatively displaceable, the movable member 20 can swing the head freely without affecting the armature 38. In addition, even when the shaft portion 38 ₁ of the armature 38 is inclined from the axis L due to a strong offset load, the shape of the contact surface of the stopper rubber 48 forms a part of a cone having the axis L as the apex. 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.
[0028]
Further, the load when the stopper rubber 48 is compressed changes nonlinearly with respect to the movement amount 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 movement of the armature 38). The amount of movement of the armature 38 with respect to the energizing current of the coil 34 can be set linearly by canceling those loads and attractive forces.
[0029]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0030]
For example, in the embodiment, the active vibration isolation support device M that supports the engine E of the automobile is illustrated, but the active vibration isolation support device of the present invention can be applied to support other vibration bodies such as machine tools. . Further, when it is not necessary to reduce the vibration in the engine shake region by the active vibration isolating support device M, the second liquid chamber 25, the upper orifice 26, the lower orifice 27, and the diaphragm 22 can be omitted. The stopper rubber 48 in the embodiment are provided on the stopper surface 38 ₃ of the armature 38 side, can be provided it the stopper surface 32 ₂ of the yoke 32 side.
[0031]
【The invention's effect】
As described above, according to the first aspect of the present invention, the conical stopper surface of one of the yoke and the armature is engaged with the conical stopper surface of the other and the armature and the yoke are mutually engaged. The stopper rubber that prevents direct contact is provided, so even if the air gap between the yoke and armature is set small to reduce the coil size and reduce power consumption, the sucked armature directly contacts the yoke and generates noise. It can be prevented from occurring. Further, if the magnitude of the reaction force that the armature receives from the yoke is adjusted by changing the hardness and shape of the stopper rubber, the characteristic of the amount of movement of the armature with respect to the energization current of the coil can be set linearly.
[0032]
Since the conical stop face of the armature and the yoke through the scan Toppagomu are in contact with each other, it is possible to prevent the armature that swings from the axis by a centering effect of the conical stopper surface.
[Brief description of the drawings]
1 is a longitudinal sectional view of an active vibration isolating support device. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. Sectional view of line [FIG. 5] Sectional view of line 5-5 in FIG. 1 [FIG.
E Engine (vibrating body)
L axis 14 first elastic body (elastic body)
20 movable member 24 first liquid chamber (liquid chamber)
29 Actuator 32 York
32 ₂ conical stopper surface 34 coil
38 ₃ Conical stopper surface 38 Armature 48 Stopper rubber

Claims (1)

An elastic body (14) that receives a load of the vibrating body (E);
A liquid chamber (24) in which the elastic body (14) forms at least a part of the wall surface;
A movable member (20) for changing the volume of the liquid chamber (24);
In the active vibration isolating support device comprising an actuator (29) for attracting and driving the armature (38) connected to the movable member (20) to the yoke (32) by electromagnetic force generated by the coil (34),
The yoke (32) and the armature (39) each have a conical stopper surface (32 ₂ , 38 ₃ ) about the axis (L) along which the armature (38) moves , and both the conical stopper surfaces. (32 ₂ , 38 ₃ ) are opposed to each other,
The They yoke (32) and one of the conical stop face of the armature (39) (38 _3), the other one of the conical stop face (32 ₂₎ in engagement with the armature (38) and the yoke direct contact each other (32), characterized in that the stopper rubber (48) is provided to prevent, active vibration isolating support equipment.

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