JP3736991B2 - Active anti-vibration support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is connected to 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 a counter liquid chamber side of the movable member. The present invention relates to an active vibration isolating support device including an actuator that attracts and drives the armature to the counter liquid chamber side by electromagnetic force generated by a coil.
[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]
Therefore, it is conceivable that the armature is supported by a bearing so as to move along the axis, and the contact with the yoke due to the inclination of the armature is avoided. A problem arises in that the bearings wear early and the durability of the actuator decreases.
[0006]
The present invention has been made in view of the above-described circumstances, and an object thereof is to reduce power consumption without reducing the durability of an actuator that drives a movable member in an active vibration-proof support device.
[0007]
[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 An active vibration isolating support device comprising: a movable member to be changed; and an actuator that drives an armature connected to the anti-liquid chamber side of the movable member by attracting the armature to the anti-liquid chamber side by electromagnetic force generated by a coil. Is supported by the bearing, and the tip of the connecting rod integral with the movable member penetrates the armature loosely and is locked by the armature, and the spring is used to urge the movable member toward the liquid chamber with respect to the armature. An active vibration isolating support device is proposed in which the locking is held.
[0008]
According to the above configuration, since the armature of the actuator is supported by the bearing, the armature can be prevented from swinging and the actuator air gap can be set to an optimum size, and the coil can be reduced in size to reduce power consumption. can do. In addition, the connecting rod integral with the movable member loosely penetrates the armature connected to the anti-fluid chamber side of the movable member, and the armature is applied to the armature by the elastic force of the spring urging the movable member toward the liquid chamber side with respect to the armature Since the coil is driven by sucking the armature to the anti-liquid chamber side, the armature and the connecting rod can be reliably integrated by the above-mentioned locking, and can be moved by the load received from the liquid chamber. Even if a vibration occurs in the member, the deformation of the spring prevents the vibration from being directly transmitted to the armature, thereby preventing uneven wear of the bearing and improving the durability and reliability of the actuator.
[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. Correspondingly, the disc spring 42 of the embodiment corresponds to the spring of the present invention.
[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.
[0011]
1 to 4 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. FIG. 4 is a sectional view taken along line 3-3, and FIG.
[0012]
The active vibration isolating support device M shown in FIGS. 1 to 4 is for elastically supporting the engine E of the automobile on the vehicle 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.
[0013]
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.
[0014]
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 is fixed to the inner periphery of the second elastic body 18 by vulcanization adhesion. The cap member 19 is fixed by press-fitting to the movable member 20 arranged on the axis L so as to be movable up and down. The outer periphery of the diaphragm 22 to the caulking portion 13 the ring member 21 fixed to _one of the outer cylinder 13 is fixed by vulcanization adhesion, a cap member 23 which is fixed by the inner periphery vulcanization bonding of the diaphragm 22 is the It is fixed to the movable member 20 by press fitting.
[0015]
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.
[0016]
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).
[0017]
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).
[0018]
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.
[0019]
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.
[0020]
A yoke 32 is fixed to the actuator support member 30, and a coil 34 wound around the bobbin 33 is housed in a space formed inside the yoke 32 and fixed by a spring washer 35. A bearing 36 is fitted from below to a cylindrical portion 32 ₁ of the yoke 32 fitted to the inner periphery of the annular coil 34 and fixed by a screw lid 37. Shaft portion 38 ₁ from central tubular extending below the disc-shaped armature 38 facing the upper surface of the coil 34 is vertically slidably supported by the bearing 36.
[0021]
A connecting rod 39 is loosely fitted to the upper portion of the shaft portion 38 ₁ of the armature 38 with a gap α, and a bolt 40 penetrating the connecting rod 39 upward from below is fastened to the movable member 20. The head portion 40 _{1 of the} bolt 40 is urged upward by a coil spring 41 disposed between the bottom surface of the bearing 36 and abuts against a step portion 38 ₂ formed on the inner peripheral surface of the shaft portion 38 ₁ . A disc spring 42 is disposed between the step 39 ₁ formed on the connecting rod 39 and the upper surface of the shaft 38 ₁ . Therefore, the connecting rod 39 integrated with the movable member 20 is connected to the armature 29 by the elastic force of the coil spring 41 and the disc spring 42, and when the eccentric load shown by the arrow in FIG. Can be shaken.
[0022]
In the armature 38 when the coil 34 of the actuator 29 is in a demagnetized state, the elastic force of the coil spring 41 acts upward via the head 40 _{1 of the} bolt 40, and the pressure of the liquid and the second elastic body 18. The elastic force is acting downward, and it stops at the neutral position where the forces in the vertical direction are balanced. In this state, there is an air gap β between the conical stopper surface 32 ₂ formed in the upper surface opening of the yoke 32 and the conical stopper surface 38 ₃ formed on the outer periphery of the armature 38 so as to oppose it. It is formed.
[0023]
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.
[0024]
In the frequency region of the engine shake vibration, the actuator 29 is kept in an inoperative state.
[0025]
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.
[0026]
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 downward due to vibration and the volume of the first fluid chamber 24 decreases and the fluid pressure increases, the coil 34 is excited to attract the armature 38. As a result, the armature 38 moves downward together with the movable member 20 while compressing the coil spring 41, and deforms the second elastic body 18 connected to the inner periphery of the movable member 20 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.
[0027]
On the contrary, when the engine E is biased upward due to vibration and the volume of the first liquid chamber 24 increases and the hydraulic pressure decreases, the coil 34 is demagnetized to release the suction of the armature 38. As a result, the armature 38 moves upward together with the movable member 20 by the elastic force of the coil spring 41, and deforms the second elastic body 18 connected to the inner periphery of 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.
[0028]
Now, the armature 38 to reciprocate in the vertical direction during operation of the actuator 29, since the shaft portion 38 ₁ is slidably supported by a bearing 36 fixed to the yoke 32, the axis L without swinging in the lateral direction It is held in the correct posture. Therefore, the air gap β between the armature 38 and the yoke 2 can be set small, and the coil 34 can be miniaturized to the minimum necessary to reduce power consumption.
[0029]
Further, when the movable member 20 reciprocates in the vertical direction, even if the second elastic body 18 and the diaphragm 22 receive a lateral load from the liquid, the movable member 20 that supports the second elastic body 18 and the diaphragm 22 Since the gap α is formed between the integral connecting rod 39 and the shaft portion 38 ₁ of the armature 38, the connecting rod 39 deforms the coil spring 41 and the disc spring 42 and has its neck in the direction of the arrow in FIG. It can be shaken. As a result, the vibration of the movable member 20 is not directly transmitted to the armature 38, and wear of the bearing 36 that supports the shaft portion 38 ₁ of the armature 38 can be prevented to improve the durability and reliability of the actuator 29.
[0030]
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.
[0031]
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.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the armature of the actuator is supported by the bearing, it is possible to prevent the armature from swinging and set the air gap of the actuator to an optimum size. The coil can be miniaturized to reduce power consumption. In addition, the connecting rod integrated with the movable member loosely penetrates the armature connected to the anti-fluid chamber side of the movable member, and the armature is urged by the elastic force of the spring that urges the movable member toward the liquid chamber with respect to the armature. Since the coil is driven by sucking the armature to the anti-liquid chamber side, the armature and the connecting rod can be reliably integrated by the above-mentioned locking, and can be moved by the load received from the liquid chamber. Even if a vibration occurs in the member, the deformation of the spring prevents the vibration from being directly transmitted to the armature, thereby preventing uneven wear of the bearing and improving the durability and reliability of the actuator.
[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. Figure [Explanation of symbols]
E Engine (vibrating body)
14 First elastic body (elastic body)
20 movable member 24 first liquid chamber (liquid chamber)
29 Actuator 34 Coil 36 Bearing 38 Armature 42 Belleville Spring (Spring)

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) constitutes at least a part of the wall surface;
A movable member (20) for changing the volume of the liquid chamber (24);
An actuator (29) for driving the armature (38) connected to the counter liquid chamber (24) side of the movable member (20) by attracting the armature (38) to the counter liquid chamber (24) side by electromagnetic force generated by the coil (34); ,
In an active vibration isolating support device comprising:
The armature (38) is supported by the bearing (36), and the tip of the connecting rod (39) integral with the movable member (20) passes through the armature (38) loosely and is locked to the armature (38). An active vibration isolating support device, wherein the locking is held by the elastic force of a spring (42) that urges the movable member (20) toward the liquid chamber (24 ) with respect to (38).

Images