JP4179850B2 - Active liquid seal vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, in Ekifubofu device, according to the active liquid Fubofu device that absorbs vibration by variable Te the volume of the liquid chamber to the vibrating member.
[0002]
[Prior art]
As such an active liquid seal vibration isolator, an apparatus in which a vibration member is driven by a solenoid armature is known. Also, it is well known that a solenoid is used only for movement on either the pull side or the push side with respect to vertical vibrations of the vibration member, and the return is performed by the elasticity of a rubber film.
[0003]
Since the vibrating member and the armature in these known examples are firmly connected and integrated by screwing or the like, if the vibrating member is tilted in the direction intersecting the armature movement axis (hereinafter referred to as the lateral direction) during assembly, The armature may be tilted together with the vibration member, and may be eccentric with respect to the axis of the bearing member made of a metal bearing or the like that slidably supports the armature (hereinafter, this state is referred to as lateral vibration). After that, when the armature slides while being laterally shaken, the bearing member of the armature is unevenly worn, resulting in a decrease in durability, making it difficult to use a practical solenoid in the active liquid seal vibration isolator. Therefore, it is desired that the centering can be accurately performed without causing side shaking during assembly.
[0004]
On the other hand, it is shown that the lateral vibration of the armature is reduced by connecting the vibration member and the armature so as to be bendable (see Patent Document 1). In other words, a portion of the vibration member is loosely fitted to the tubular portion of the armature, and the vibration member is bent with respect to the armature by interposing a disc spring between the vibration member and the armature and connecting with a bolt. It is possible.
[0005]
[Patent Document 1]
JP-A-2001-1765 [0006]
[Problems to be solved by the invention]
By the way, when the structure as in Patent Document 1 is used, the vibration member does not bend unless a relatively large force is applied due to the rigidity of the disc spring. In many cases, the vibration member does not bend independently and the armature is not bent. As a result, the armature still shakes. Further, when a fitting structure of the vibration member and the armature is employed, the structure becomes relatively complicated. Accordingly, an object of the present invention is to improve the centering accuracy and assemblability during assembly by making the connecting portion of the vibration member and the armature easily bend to prevent lateral vibration, and to simplify the structure.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention relates to an active liquid seal vibration isolator of the present application, wherein a main liquid chamber having an insulator for connecting a first mounting member and a second mounting member as a part of a wall portion; An excitation member that forms a part of the other wall forming the main liquid chamber and makes the volume of the main liquid chamber variable, and a pull-type drive means that pulls and drives the excitation member. thereby consolidated with the vibrating member moving portion provided in the drive means, the active fluid Fubofu apparatus bearing movably supported in the input direction of the principal vibration, the moving unit, respectively and the vibrating member The vibrating member is formed separately and connected by a string-like connecting member so that the swinging member can swing with respect to the moving portion.
[0008]
A second aspect is characterized in that, in the first aspect, the driving means is a solenoid, and the moving portion is an armature of the solenoid.
[0009]
According to a third aspect of the present invention, in the second aspect of the present invention, the connecting portion between the string-like connecting member and the armature is located on the side farthest from the vibration member among the axial ends of the armature. .
[0010]
According to a fourth aspect of the present invention, the solenoid according to the second aspect is proportional, and has a gap formed between an end portion of the armature and a magnetic flux concentrating portion of the solenoid, and the string-like connecting member and the additional member. A gap adjusting means for adjusting the gap is provided at a connecting portion with a vibration member or the armature.
[0011]
A fifth aspect of the present invention is the method of the fourth aspect, wherein one end of the string-like connecting member is caulked and fixed to either the vibration member or the armature, and the other end is either the vibration member or the armature. The gap adjusting means is configured by being screwed to the other side.
[0012]
A sixth aspect of the present invention is the method according to the first aspect, wherein one end of the string-like connecting member is passed through a through hole formed in the vibrating member or the moving portion, and the periphery of the through hole is reduced in diameter. Features.
[0013]
【The invention's effect】
According to the first aspect, since the vibration member and the moving part of the driving means are formed separately and both are connected by the string-like connection member, when the vibration member is inclined, only the vibration member is easily swung. It moves and tilts, making it difficult to transmit vibration to the moving part. Therefore, the moving part can be assembled in a highly accurate centering state without side shake, the centering accuracy and assembling performance during assembly are improved, and the moving part is less eccentric during assembly, that is, the initial offset is small. Can be.
[0014]
In addition, when the active liquid seal vibration isolator is active, the moving part can move with a small initial offset, so that uneven wear of the bearing member can be reduced. In addition, since the vibration member and the moving part need only be connected by a string-like connecting member, the structure is simplified, the assembly is easy and the durability is improved, and the manufacturing can be performed at low cost.
Furthermore, noise generated during sliding with low centering accuracy can be reduced, and sliding resistance can be reduced, so that reliable operation of the moving part by the driving means can be ensured.
[0015]
According to the second aspect of the present invention, since the armature as the moving portion has a small lateral vibration, even if the driving means is a solenoid, it can be highly durable and practical.
[0016]
According to the third aspect, since the connecting portion between the string-like connecting member and the armature is located at the axial end of the armature farthest from the vibration member, the connecting length of the string-like connecting member is maximized. Can do. As a result, it is possible to minimize the lateral movement of the armature with respect to the swinging motion of the vibration member.
[0017]
According to claim 4, when the solenoid is a proportional type, it is necessary to keep the gap between the armature and the magnetic flux concentrating portion of the solenoid within a predetermined range, but the connecting portion between the string-like connecting member and the vibration member or the armature is required. Since the gap adjusting means is provided, the gap adjustment can be easily and accurately performed.
[0018]
According to the fifth aspect of the present invention, one end of the string-like connecting member is caulked and fixed to either the vibration member or the armature, and the other end is screwed to either the vibration member or the armature, thereby adjusting the gap. In addition, it is sufficient to provide the gap adjusting means only on one end side.
[0019]
According to the sixth aspect, since one end of the string-like connecting member is passed through the through-hole formed in the vibrating member or the moving part and the circumference of the through-hole is reduced, the connection is simple and accurate. it can.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment will be described below with reference to the drawings. FIG. 1 is an entire cross-section of an automotive engine mount as an embodiment, and FIG. 2 is an enlarged cross-sectional view of an armature seal portion. In FIG. 1, the engine mount 1 includes a first attachment member 2 attached to an engine side (not shown), a second attachment member 3 attached to a vehicle body side (not shown), and an insulator 4 interposed therebetween. .
[0021]
The insulator 4 is an anti-vibration elastic body such as an anti-vibration rubber made of an appropriate elastic material such as rubber, has a predetermined spring constant for absorbing input vibration from the first mounting member 2, and is substantially as a whole. It has a conical shape, and the first mounting member 2 is integrated at the top, and the periphery of the skirt is connected to the second mounting member 3.
[0022]
A liquid chamber in which an incompressible liquid is sealed is formed between the first mounting member 2, the second mounting member 3, and the insulator 4, and the main liquid chamber on the insulator 4 side is formed by a partition wall 5 provided therein. 6 and an excitation chamber 7 on the opposite side across the partition wall 5. The main liquid chamber 6 and the vibration chamber 7 communicate with each other by a throttle passage 8 formed in the center of the partition wall 5, and the insulator 4 faces the main liquid chamber 6 and a part of the wall constituting the main liquid chamber 6. I am doing.
[0023]
A vibration member 10 is provided at the bottom of the vibration chamber 7. The vibration member 10 has a substantially rigid cup shape made of a ferromagnetic material such as iron or a non-magnetic material such as a metal such as aluminum or a resin, and has a disk shape when viewed from the main vibration direction Z. At the same time, the periphery thereof is supported in a floating manner by an elastic seal 11 having a substantially disk shape.
[0024]
The elastic seal 11 is made of an elastic material such as rubber that is the same as or different from that of the insulator 4, and connects the vibration member 10 and a member that is fixed to and integrated with a second mounting member 3 to be described later. The vibration member 10 is supported as a return spring that elastically deforms mainly in the shearing direction in accordance with the vertical displacement parallel to the input direction Z of the main vibration of the vibration, and the liquid leakage of the vibration chamber 7 is prevented. ing. As this rubber material, various known materials that can function as a rubber spring can be used.
[0025]
The inner peripheral side of the elastic seal 11 is baked and integrated so as to surround the outer peripheral portion 12 of the vibration member 10 having a peripheral wall shape, and an upper stopper 13 integral with the elastic seal 11 is provided above the outer peripheral portion 12 so as to protrude upward. ing. The upper stopper 13 is a chevron portion having a substantially triangular cross section formed integrally with a rubber portion continuous with the elastic seal 11 covering the outer peripheral portion 12.
[0026]
The upper stopper 13 is pressed against the partition wall 5 from the pointed tip portion in accordance with the vertical displacement of the vibration member 10 in the Z direction. By this pressing, the upper stopper 13 is compressed to generate a repulsive force, and this repulsive force gradually increases as the amount of compression increases nonlinearly with the increase in displacement. That is, non-linear spring characteristics are produced.
[0027]
The vibration member 10 is connected to a ferromagnetic metal armature 17 such as iron that is movable in the vertical direction along the center line C, and moves integrally therewith. The armature 17 will be described in detail later. The solenoid 15 is driven to move downward in the figure, and is returned to the reverse direction by the return spring means to vibrate to generate a liquid flow in the vibration chamber 7 and change the volume of the main liquid chamber 6. Let
[0028]
The drive of the solenoid 15 is controlled by a control device 18 such as a microcomputer. The solenoid 15, the armature 17 and the control device 18 constitute drive means. The armature 17 is slidably supported on the outer periphery by a metal bearing 16 integrated in the outer sheath 19 of the solenoid 15.
[0029]
This drive means is a pull type, and when the hydraulic pressure in the main liquid chamber 6 rises due to vibration input from the first mounting member 2 (hereinafter referred to as positive input), the vibration member via the armature 17 by the solenoid 15. 10 to cancel the hydraulic elevated by moving downward in FIG by reverse when the hydraulic pressure in the main liquid chamber 6 is decreased (hereinafter, referred to as the negative input) to release the pull of the armature 17 of the litters Nba Ne means The vibration member 10 is returned upward in the figure by the elastic force to suppress the fluid pressure fluctuation in the main fluid chamber 6.
[0030]
At this time, if the vibration member 10 is vibrated in substantially the same phase with respect to the input of vibration to be vibrated to the first mounting member 2, a liquid flow is generated in the vibration chamber 7 . Also, the frequency range for Akuteibu controlling the vibrating members 10 is arbitrary, for example, idling region, it can be set to 100Hz or less including the vibration frequency of the starting area.
[0031]
The outer periphery of the elastic seal 11 is baked and integrated with a cylindrical portion 21 provided in the center of the flange metal fitting 20, and the flange 22 extending radially outward from the cylindrical portion 21 is a base portion constituting the second mounting member 3. It is sandwiched between the upper flange 24 of the tubular fitting 23 and the lower end portion of the tubular fitting 25 integrated with the outer peripheral portion of the insulator 4.
[0032]
The upper flange 24 of the base tubular fitting 23 and the upper end flange 26 of the tubular fitting 25 are connected and integrated by an upper tubular fitting 27. At this time, the flanges are sandwiched by bending both ends in the vertical direction of the upper tubular fitting 27, and appropriate positions of the contact portions are welded. By this integration, the outer peripheral portion of the partition wall 5 is sandwiched between the insulator 4 and the flange 22 of the flange fitting 20 and fixed.
[0033]
The insulator 4 contacts the outer peripheral part of the partition wall 5 in two steps, upper and lower, and the upper end is in close contact with the step part 28 provided at the lower part of the inner peripheral surface of the insulator 4, and the seal is integrated with the step part 28. Sealed by the protrusion 28a (see the enlarged portion in the figure). Further, the lower end side is sealed with a seal projection 29a integrated with the inner cover 29 by pressing the lower end of the inner cover 29 formed along the inner surface of the cylindrical metal fitting 25 (see the enlarged portion in the figure). ).
[0034]
Further, a coating layer 30 that is continuous and integrated with the elastic seal 11 is provided on the flange 22, and this portion seals between the flange 22 and the lower end of the outer periphery of the partition wall 5 .
[0035]
The partition wall 5 has a substantially ring shape made of an appropriate material such as a resin, its outer peripheral portion has a large vertical width, and a circumferential groove that is formed in the circumferential direction and opens on the outer peripheral side is formed in its thickness. By closing this open portion with the inner coating 29, the inside of the circumferential groove forms a damping orifice passage 31. The damping orifice passage 31 is spirally wound in the upper and lower two stages in the outer peripheral portion, and a part thereof is communicated with the main liquid chamber 6 through the opening 32 and the other end is formed on the side wall of the second mounting member 3. The outlet 33 communicates with a secondary liquid chamber 34 formed on the outer periphery of the second mounting member 3.
[0036]
A diaphragm 36 is provided in the housing 35 that constitutes the sub liquid chamber 34, compensates for variations in the amount of liquid in the sub liquid chamber 34, and expands and contracts following the volume variation of the main liquid chamber 6. Opposite surface and the sub liquid chamber 34 side of the diaphragm 36 is extraordinary free space is open to the atmosphere through the vent hole 37.
[0037]
A partition portion 38 extending in a direction orthogonal to the center line C is formed at the center portion of the partition wall 5, and a throttle passage 8 is formed at the center thereof. The partition portion 38 covers the upper side of the vibration chamber 7 except for the throttle passage 8 portion, and the lower surface is a portion against which the upper stopper 13 is pressed.
[0038]
The partition portion 38 is formed in a state of being drawn from the vertical direction end portion of the peripheral portion of the partition wall 5 to the intermediate portion height position, and the round portion is formed between the upper side of the partition portion 38 and the upper end of the outer peripheral portion of the partition wall 5. 40 tied. An opening 32 that forms the entrance of the damping orifice passage 31 is formed by cutting out a part of the rounded portion 40.
[0039]
A portion below the partition portion 38 forms an annular wall 42 and forms a space in which the upper side of the vibration member 10 is accommodated. The annular wall 42 surrounds the periphery of the cylindrical portion 21 of the flange fitting 20 with a slight gap.
Reference numeral 43 denotes an operating space for allowing the vibration member 10 and the elastic seal 11 to move up and down, and is formed between the vibration member 10 and the elastic seal 11 and the solenoid 15.
[0040]
As shown in expanded Figure 2, the lower stopper 14 is made of an elastic material such as the same or a different rubber and the upper stopper 13, a chevron portion of the same substantially triangular cross-section with the upper stopper 13, vibrating members 10 It is formed integrally with the flange fitting 50 to be attached to, and a sharp tip projecting downward from the flange fitting 50 is in contact with the outer cover 19 of the solenoid 15.
[0041]
As the vibration member 10 is displaced in the vertical direction in the Z direction, the lower stopper 14 is compressed by being pressed against the upper surface of the outer cover 19 of the solenoid 15 to generate a repulsive force. This repulsive force increases the amount of compression. It will gradually increase as you go. That is, the lower stopper 14 constitutes a return spring means together with the elastic seal 11, and gives the return spring means a non-linear spring characteristic.
[0042]
Strictly speaking, the start of compression of the lower stopper 14 is a stage where it is compressed to a level that generates a spring force that substantially functions as a part of the return spring, and the displacement amount of the vibration member 10 exceeds a predetermined amount. When, for example, the vibration member 10 at the time of activation becomes larger than a preset displacement, the vibration member 10 is started. On the other hand, the spring force is not generated up to a predetermined displacement amount, or even if it is generated, the spring force is extremely small and is considerably weaker than the spring force of the elastic seal 11 as a return spring.
[0043]
As an initial setting for realizing such an action, for example, when the vibration member 10 is in a neutral position, that is, in a state where it does not move by vibrating in the vertical direction in the figure, the tip of the lower stopper 14 is moved by a predetermined amount of displacement. And a predetermined clearance can be provided in advance between the contact partner and the contact partner.
[0044]
However, such initial setting is arbitrary, and in order not to generate a hitting sound at the time of contact / separation, the sharp tip of the lower stopper 14 is lightly pressed against the outer cover 19 from the beginning, The amount of compression of the lower stopper 14 should not be so large that the spring of the elastic seal 11 is the main component of the total return spring until the amount of displacement is increased. You may make it increase.
[0045]
Such a change can be easily realized by forming the lower stopper 14 into a mountain shape having a substantially triangular cross section. In the present embodiment, such a configuration that contacts from the beginning is adopted. The initial setting in the contact and compression of the upper stopper 13 with respect to the partition wall 5 can be performed in the same manner, and the action of the upper stopper 13 during compression also occurs in the same manner as the lower stopper 14.
[0046]
The flange fitting 50 includes an outward flange portion 51, an outer peripheral wall 52 formed by folding the outer peripheral side tip upward, and a cylindrical portion 53 protruding upward from the inner peripheral end of the outward flange portion 51. The cylindrical part 53 is fixed and integrated by a suitable means such as press-fitting or caulking into a small-diameter step part 54 formed at the lower outer periphery of the vibration member 10.
[0047]
Further, a part of the rubber continuous with the lower stopper 14 forms a diaphragm-like armature seal 55 that spreads outward from the outer peripheral wall 52 in the radial direction of the vibration chamber 7, and the outer peripheral side enlarged portion 56 is connected to the elastic seal 11. The seal projection 57 continuously formed on the flange 22 and the outer cover 19a forming a part of the outer cover 19 are airtightly sandwiched and sealed.
[0048]
The upper chamber 58 is a sealed space surrounded by the armature seal 55, the elastic seal 11, and the vibration member 10. On the other hand, the lower chamber 59 is a sealed space surrounded by the armature seal 55, the solenoid 15, and the vibration member 10, and prevents air flow from the outside. As described above, the armature seal 55 is provided so that the working space 43 is partitioned into the upper chamber 58 and the lower chamber 59 serving as a sealed space, so that the armature 17 located on the lower chamber 59 side can be sealed without opening to the atmosphere. Accordingly, since the armature 17 made of a ferromagnetic material such as iron can be made less likely to rust and the rust prevention can be improved, the predetermined performance can be maintained even when used for a long time.
[0049]
The capacity of the lower chamber 59 is remarkably smaller than that of the upper chamber 58, and is such that no inconvenience is caused in the vertical vibration of the vibrating member 10 even if there is no air flow between the inside and outside. In addition, since the armature seal 55 has a diaphragm shape, the deformation allows the air flow in the lower chamber 59. Also the lower chamber 59 which may be divided into and out by the lower stopper 14 in the radial direction, but allows more air flow communication with the inside and outside of the space communicating groove formed in a part of the lower stopper 14 at this time I have to.
[0050]
Further, a part of the rubber continuous with the lower stopper 14 and the armature seal 55 is a metal part covering 64 that integrally covers the upper surface of the outward flange part 51, the periphery of the outer peripheral wall 52, and the outer surface of the cylindrical part 53 in the flange metal part 50. A seal projection 65 projecting upward is integrally formed in the vicinity of the upper end of the cylindrical portion 53, which is the upper end thereof. When the cylindrical portion 53 is fixed to the stepped portion 54 of the vibration member 10, the seal protrusion 65 is in close contact with the lower surface of the side protruding portion 66 formed on the vibration member 10, and the cylindrical portion 53 and the vibration member 10 is sealed.
[0051]
The lower stopper 14 and the armature seal 55 are made of a heat-resistant elastic material such as natural rubber having a heat-resistant prescription or various known synthetic rubbers. The upper stopper 13 and the elastic seal 11 can also have a similar heat resistant structure. Furthermore, characteristics such as chemical resistance and oil resistance may be added to these.
[0052]
FIG. 3 shows the lower stopper 14 portion from below in FIG. As is apparent from this figure, the lower surface side of the lower stopper 14 has a block shape arranged at substantially equal intervals in the circumferential direction. For example, an arbitrary plural number such as six shown is provided. Between the adjacent lower stoppers 14, a gap 63 having substantially the same width as the lower stopper 14 is provided. In addition, it can also be set as the single ring shape which does not become block shape in this way and continues to the perimeter.
[0053]
The gap 63 is provided as an example of a recess for the purpose of making the non-linear spring characteristic of the lower stopper 14 remarkable, and at the same time, the communicability of the inner and outer portions in the radial direction divided by the lower stopper 14 in the lower chamber 59 is ensured. Thus, when the lower stopper 14 comes into contact with the outer coating 19, it is possible to avoid air confinement between the lower stopper 14 and the armature 17 and to ensure good operability of the armature 17 moving in the vertical direction in the figure. To.
[0054]
However, the gap 63 is not necessarily provided so as to communicate with the inside and outside of the lower chamber 59. When aiming only at the non-linear spring characteristics, a simple recess that does not communicate with the inside and outside of the lower chamber 59 is formed and partially compressed. You can just make things easier.
[0055]
As apparent from FIGS. 3 and 4, a relatively shallow and narrow slit-like communication groove 68 is formed at the center of the bottom 67 of the gap 63 in the radial direction. The communication groove 68 is for communicating the inner and outer portions of the lower chamber 59 even when the lower stopper 14 is fully compressed, and the width and depth thereof are arbitrary as long as air permeability during compression can be ensured. And the number is also arbitrary. In some cases, the communication groove 68 can be omitted.
[0056]
As shown in FIG. 4, the width and depth of the gap 63 may be arbitrary considering the non-linear spring characteristics of the lower stopper 14, and are naturally determined by making the lower stopper 14 large enough to obtain a necessary spring. . However, the depth h is less than the thickness H of the lower stopper 14, and h / H is preferably about 1/10 to 9/10, and if it is about 1/3 to 1/2, it is easy to balance the spring. preferable.
[0057]
Next, a connection structure between the vibration member 10 and the armature 17 will be described. As is apparent from FIG. 5, the vibration member 10 and the armature 17 are formed separately and are connected by a string-like connection member 70. When the vibrating member 10 and the armature 17 are moved up and down integrally, the string-like connecting member 70 is input with main vibrations to the vibrating member 10 due to fluid pressure fluctuations in the main liquid chamber 6 and the vibrating chamber 7. This is a member that freely connects the vibration member 10 to the armature 17 so that the vibration member 10 can swing when a force in a direction intersecting the direction Z, that is, a lateral direction is applied.
[0058]
At both ends in the lengthwise direction of the string-like connecting member 70, end fixtures 71 and 72 having a diameter larger than that of the string-like connecting member 70 such as a cylindrical metal fitting are secured via fixed retaining rings 71a and 72a. Installed. The end fixing tool 71 on the vibration member 10 side is accommodated in a hole 73 formed in the center of the vibration member 10 and is fixed by caulking with a vertical flange-shaped caulking portion 74 formed around the hole 73. The
[0059]
The end fixture 72 on the armature 17 side has a male screw formed around it, and this portion is screwed into a female screw portion 76 provided at the lower portion of a shaft hole 75 formed at the center of the armature 17. Is done. This screw connection constitutes a gap adjusting means (details will be described later) of the armature 17. However, the mounting structure is not limited to this example, and can be arbitrarily selected. For example, when the gap adjusting means is omitted, both ends of the string-like connecting member 70 can be directly embedded in the vibrating member 10 and the armature 17.
[0060]
In the present embodiment, the female screw portion 76 is provided in the lower portion of the shaft hole 75, that is, the lower portion of the armature 17. In this way, the length of the string-like connecting member 70 can be made the longest, which is longer than the distance between the vibrating member 10 and the armature 17, so that even if the vibrating member 10 swings, the influence on the armature 17 is increased. Can be minimized.
[0061]
That is, the movement of the armature 17 is not affected by the swinging motion of the vibration member 10, and the lateral vibration during movement is reduced. For this reason, the centering accuracy at the time of movement becomes high, and uneven wear of the sliding bearing 16 can be suppressed. The bearing 16 in the present embodiment is an oilless type metal bearing, as shown in the enlarged portion in FIG.
[0062]
In this embodiment, the sliding surface of the bearing 16 on which the armature 17 slides is constituted by an alloy layer 77 such as copper provided with a low-friction material coating layer 78, and the sliding surface has a friction coefficient μ = 0. 0.03 to 0.2. For the low friction material coating layer 78, for example, a known layer made of a fluororesin can be used.
[0063]
With such a structure, the low friction material coating layer 78 made of fluororesin is susceptible to wear. However, by reducing the lateral vibration of the armature 17, the durability of the low friction material coating layer 78 is increased. Reference numeral 79 in the figure denotes a base material made of iron or the like in the bearing 16. For example, if the thickness is 0.7 mm, the sliding surface is set to a ratio of about 0.3 mm.
[0064]
The gap adjusting means is for adjusting the gap g between the armature 17 and the magnetic flux concentrating portion 15a of the solenoid 15 shown in FIG. 5, and adjusting the screwing amount of the end fixture 72 to the female screw portion 76. As a result, the armature 17 moves in the vertical direction in the figure, and the gap g with the magnetic flux concentrating portion 15a changes. The purpose of this gap adjustment is to adjust the gap g within a range where the output of the solenoid is constant because the solenoid 15 in this embodiment is a proportional solenoid.
[0065]
That is, the proportional solenoid output is constant only when the gap g is within a predetermined range, as shown in FIG. 6 which shows a general relationship between the output (vertical axis) and the size of the gap (horizontal axis). Has characteristics. Therefore, in order to use the proportional solenoid stably, it is necessary to adjust the gap g to be within a predetermined range indicated as a use range, and the adjustment of the gap can be realized accurately and easily.
[0066]
The gap adjusting means is not limited to screw connection. In order to adjust the gap g, such as the length adjusting structure of the string-like connecting member 70, the position of the armature 17 with respect to the solenoid 15 or the distance between the vibrating member 10 and the armature 17 in the tension state of the string-like connecting member 70 can be adjusted. Any thing can be used.
[0067]
The string-like connecting member 70 may be anything as long as it can be bent to the extent that it can swing and has a required tensile strength. For example, a single-wire or strip-like member such as a piano wire, or a wire-like member obtained by twisting thin wires made of these materials to a certain thickness, and a multi-joint linear member such as a chain are possible. However, in order to eliminate the directionality in the bending, those having a circular or regular polygonal cross section are preferable.
[0068]
The material is not particularly limited as long as it has a necessary tensile strength, such as a synthetic resin or a metal. Further, considering the heat generation of the solenoid 15 portion, a material excellent in heat resistance is preferable. Moreover, it is also preferable that it is excellent in rust prevention property. Therefore, considering these, for example, a wire made of stainless steel or a heat resistant resin is preferable.
[0069]
FIG. 7 shows an example in which the string-like connecting member 70 is configured as a wire-shaped stranded wire, in which A is twisted in one direction and B is twisted in both directions. Of these, those twisted in both directions of B can hardly return the twist, so that the dimensional accuracy of the string-like connecting member 70 can be maintained with high accuracy. Therefore, in the case of adopting a stranded wire type, it is preferable to use the one twisted in both directions as shown in B in a more accurate application.
[0070]
FIG. 8 shows another example of adjusting the length of the string-like connecting member 70 on the armature 17 side. In this example, a small-diameter portion 80 is provided at the bottom of the armature 17, one end of the string-like connecting member 70 is inserted into a through hole 81 formed at the center thereof, and the small-diameter portion 80 is made a predetermined length by a press machine or the like. The diameter is reduced to integrate and connect, and the inner portion of the end portion of the string-like connecting member 70 is cut. In this way, since it can be replaced with a screwing structure, it can be made simpler and cheaper.
[0071]
Next, the operation of this embodiment will be described. First, at the time of assembly, the vibrating member 10 and the armature 17 are connected by the string-like connecting member 70, so that even if the vibrating member 10 is inclined, the string-like connecting member 70 almost transmits this inclination to the armature 17. Therefore, the armature 17 is fitted into the shaft hole of the metal bearing 16 without causing the lateral swing, and the state where the amount of eccentricity is small, that is, the initial offset is small. For this reason, centering accuracy and assemblability are improved.
[0072]
Further, since the armature 17 can move with a small initial offset during the subsequent operation, uneven wear of the metal bearing 16 can be reduced. In addition, since the vibrating member 10 and the armature 17 need only be connected by the string-like connecting member 70, the structure is simplified, the assembly is easy and the durability is improved, and the manufacturing can be performed at low cost. Furthermore, since the noise generated when sliding with low centering accuracy can be reduced and the sliding resistance is reduced, the armature 17 can be reliably operated by the solenoid 15.
[0073]
Next, when the engine mount assembled as described above is in use, when activated, an idle vibration of about 30 Hz, for example, is input to the first mounting member 2 as a vibration to be prevented by the solenoid 15 so as to cancel it. The vibrating member 10 is vibrated at substantially the same phase and the same frequency as the vibration to be shaken. Thereby, the internal pressure fluctuation of the main liquid chamber 6 is absorbed. At this time, the elastic seal 11 and the stoppers (13, 14) function as return spring means. When the input vibration increases and exceeds a predetermined displacement, the amount of compression of the lower stopper 14 increases abruptly, giving a non-linear spring characteristic.
[0074]
On the other hand, in the passive mode, the solenoid 15 makes the vibration member 10 free for vibration inputs other than vibrations to be vibrated, so that the vibration member 10 changes the hydraulic pressure transmitted from the main liquid chamber 6. Displaces accordingly. At this time, only the elastic seal 11 responds to vibration input of a relatively small amplitude mainly by elastic deformation in the shear direction, and good low spring characteristics can be obtained.
[0075]
At the time of the activation, when the controller 18 energizes the solenoid 15 (FIG. 1), the armature 17 is moved downward by the magnetic force. At this time, since the vibration member 10 is connected to the armature 17 via the string-like connection member 70, the vibration member 10 moves downward integrally with the armature 17 while compressing the lower stopper 14.
[0076]
Further, when the energization to the solenoid 15 is stopped, the armature 17 becomes free, the vibration member 10 moves upward due to the rebound resilience of the lower stopper 14 acting as a return spring, and returns via the string-like connection member 70. The armature 17 connected to the vibration member 10 also moves upward.
[0077]
In such vertical movement of the vibrating member 10 and the armature 17, a force in a direction intersecting with the main vibration input direction Z is applied to the vibrating member 10 due to the fluid pressure fluctuations of the main liquid chamber 6 and the vibrating chamber 7. When applied to the vibration member 10, the vibration member 10 tends to swing laterally with respect to the main vibration input direction Z, but the vibration member 10 is connected to a separate armature 17 via a string-like connection member 70. Therefore, only the vibration member 10 easily swings with respect to the armature 17.
[0078]
Therefore, this swing motion does not affect the armature 17, and the armature 17 does not swing with the vibration member 10 in most cases. As a result, the armature 17 does not swing left and right when moving up and down, and can maintain a highly accurate centering state when moving up and down, thus maintaining good sliding performance with the bearing 16 to reduce frictional resistance and prevent uneven wear. it can.
[0079]
For this reason, it is not necessary to increase the output of the solenoid 15, and durability is improved. Further, the vibration member 10 and the armature 17 can be connected with a simple structure. Therefore, assembly and manufacturing are easy and the cost can be reduced. Moreover be attached at the end fixture 71 and 72 as in this embodiment, it is easy to adjust the gap g (FIG. 5).
[0080]
Further, since the return spring is configured by using the lower stopper 14, it is not necessary to use a return spring such as a special coil spring, so that the number of parts is reduced and the centering accuracy is increased. In addition, non-linear spring characteristics can be obtained.
In addition, since the rubber portions such as the lower stopper 14 and the armature seal 55 and the elastic seal 11 and the upper stopper 13 are made of heat-resistant materials, even in a usage environment where the heat is high due to the radiation heat of the engine or the heat generation of the vibration isolator itself. Durability can be improved.
[0081]
Furthermore, since the outer peripheral side distal end portion 56 of the armature seal 55 is fixed to the second mounting member 3 side, the vibration member 10 can be easily centered and positioned, so that the assembly accuracy can be improved. In addition, since the armature seal 55 is provided separately from the vibration member 10 and the elastic seal 11 and is provided integrally with the lower stopper 14, only the characteristics of the lower stopper 14 can be changed without changing the vibration member 10 side. Therefore, it becomes easy to cope with various specification changes by sharing parts. Further, since the armature seal 55 can be formed integrally with the lower stopper 14, the number of parts is reduced, the structure is simplified, and the manufacture is facilitated.
[0082]
The invention of the present application is not limited to the above-described embodiment, and various modifications and applications are possible. For example, the armature seal 55 can be formed integrally with the elastic seal 11 and further separated from the lower stopper 14. Good. In addition to the engine mount, it can be used as a vibration isolator for vibration isolation in various vibration transmission paths. It can also be used as a vibration damper by being attached to a vibration source.
[Brief description of the drawings]
1 is an overall cross-sectional view of an engine mount according to a first embodiment. FIG. 2 is an enlarged cross-sectional view of an armature seal portion. FIG. 3 is an enlarged view of a lower stopper and an armature seal portion. Fig. 5 is an enlarged cross-sectional view showing the gap adjusting means. Fig. 6 is a graph showing the relationship between the output of the proportional solenoid and the gap. Fig. 7 is a diagram showing a string-like connecting member having a stranded wire structure. ] Shows another example of the connection structure of the armature and the string-like connecting member.
1: engine mount, 2: first mounting member, 3: second mounting member, 4: insulator 5: partition wall, 6: main liquid chamber, 7: oscillating chamber, 10: vibrating member, 11: elastic Sea Le, 13: upper stopper, 14: lower stopper, 15: solenoid, 15a: flux concentration portion, 16: metal bearing (bearing member), 17: armature 37: vent 55: armature seal, 58: upper chamber, 59: lower chamber , 63: gap, 70: string-like connecting member, 71: end fixture, 72: end fixture

Claims (6)

A main liquid chamber having an insulator connecting the first mounting member and the second mounting member as a part of a wall part, and forming a part of another wall part forming the main liquid chamber and the main liquid chamber a vibrating member which the volume is variable, along with the vibrating member to pull and a pull-type driving means for driving and consolidated with the vibrating member moving portion provided in the drive means, principal vibration In an active liquid seal vibration isolator supported by a bearing so as to be movable in the input direction of
An active liquid-sealed anti-vibration system, wherein the vibration member and the moving part are separately formed and connected by a string-like connecting member so that the vibration member can swing with respect to the moving part. apparatus.   2. The active liquid seal vibration isolator according to claim 1, wherein the driving means is a solenoid and the moving part is an armature of the solenoid.   3. The active liquid seal according to claim 2, wherein a connecting portion between the string-like connecting member and the armature is positioned on a side of the armature that is farthest from the vibrating member in an axial end portion of the armature. Anti-vibration device.   The solenoid is proportional, has a gap formed between the end of the armature and the magnetic flux concentrating portion of the solenoid, and is connected to the connecting portion between the string-like connecting member and the exciting member or the armature. The active liquid seal vibration isolator according to claim 2, further comprising gap adjusting means for adjusting the gap.   One end portion of the string-like connecting member is caulked and fixed to either the vibration member or the armature, and the other end portion is screwed to either the vibration member or the armature, and the gap adjusting means The active liquid seal vibration isolator according to claim 4, wherein:   2. The active device according to claim 1, wherein one end of the string-like connecting member is passed through a through hole formed in the vibrating member or the moving portion, and the periphery of the through hole is reduced to reduce the diameter. Mold liquid seal vibration isolator.

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