JP4540864B2 - Liquid seal vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid seal vibration isolator for use in an automobile engine mount or the like, and more particularly to an apparatus that exhibits the effect of liquid column resonance by an open / close orifice passage in a wide frequency range.
[0002]
[Prior art]
In an engine mount which is an example of such a liquid seal vibration isolator, a first attachment member attached to the engine on the vibration generating side, a second attachment member attached to the vibration receiving side, and interposed therebetween. An elastic main body member, a main liquid chamber having the elastic main body member as a part of a wall, and a sub liquid chamber partitioned by the main liquid chamber and a partition member and covered with a flexible film member, both of these liquid chambers Is connected by an idle orifice passage that is opened and closed in the idle vibration frequency range, and a lateral movable film for absorbing internal pressure is provided on the peripheral wall surrounding the main liquid chamber, and the control chamber provided surrounding the lateral movable film is suctioned negatively. By switching the connection to pressure or atmosphere, the internal pressure fluctuation in the main liquid chamber is absorbed as an open state that enables free elastic deformation, or flows into the idle orifice passage as a fixed state that restricts free elastic deformation Which increases the body flow for good by liquid column resonance are known. It is also known that an open / close valve is provided in the laterally movable membrane, and the open / close valve is opened / closed separately from the idle orifice passage by moving the open / close valve by elastic deformation of the laterally movable membrane.
[0003]
[Problems to be solved by the invention]
By the way, in the case of the type provided with the above-mentioned laterally movable film, if the fixed state is set at the start following the idle state, the vibration that increases at the start can be effectively cut off. The two-dot chain line in FIG. 4 indicates this, and the dynamic spring constant produces the first dynamic spring bottom B1 in the vicinity of the frequency a in the starting range higher than the idle range, and the phase becomes the high phase by generating the first phase peak P1. However, even in this case, the effect of the liquid column resonance in the idle orifice passage cannot reach a very wide frequency range, and is limited to a frequency b that makes the laterally movable film free again. Therefore, it is desirable to reduce the dynamic spring to a wider frequency range, and to effectively isolate the vibration by setting it to a high phase. The present invention aims to realize such a demand.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 relating to the liquid seal vibration isolator of the present application includes a first attachment member attached to either the vibration generating side or the vibration receiving side, and a second attachment attached to the other side. An attachment member, an elastic main body member interposed therebetween, a main liquid chamber having the elastic main body member as a part of a wall, the main liquid chamber and a partition member, and being covered with a flexible film member In a liquid seal vibration isolator comprising a sub liquid chamber and communicating both the liquid chambers with a first opening / closing orifice passage that is opened and closed in an idle vibration frequency range,
A plurality of laterally movable membranes for absorbing internal pressure are provided on the peripheral wall surrounding the main liquid chamber, each facing the main liquid chamber, and allowing free elastic deformation at a frequency in the starting region higher than the idle region. It is possible to switch between an open state and a fixed state that restricts free elastic deformation, and the state of these laterally movable films can be switched between different frequencies .
[0005]
According to a second aspect of the present invention, in the first aspect of the present invention, an opening / closing valve for a second opening / closing orifice passage provided separately from the first opening / closing orifice passage is provided in any of the lateral movable films. And
[0006]
According to a third aspect of the present invention, in the first aspect of the present invention, the second open / close orifice passage, the open / close valve, and a plurality of laterally movable films provided with the open / close valve are provided.
[0007]
According to a fourth aspect of the present invention, in the first aspect, the laterally movable membrane includes a plurality of adjacent movable membranes surrounded by a common control chamber . The control chamber is divided into laterally movable membranes, and the compartments are connected in series. The internal pressure is made variable through one passage connected to the external switching means provided in the compartment at one end, and the adjacent compartments are connected by a communication passage provided in the compartment wall. It is characterized by that.
[0008]
【The invention's effect】
According to the first aspect of the present invention, a plurality of laterally movable membranes are provided, these are faced in the main liquid chamber, and are switched at frequencies different from each other at a frequency in the starting region higher than the idle region. second dynamic Banebotomu and second phase peak at a higher frequency side in addition to the first dynamic Banebotomu a first phase peak had the Ji live, can extend the range of the low dynamic spring and high phase to the high frequency side, as a result , Can effectively block the transmission of vibrations in a wide range.
[0009]
According to the second aspect of the present invention, since the opening / closing valve of the second opening / closing orifice passage provided separately from the first opening / closing orifice passage is provided in any of the lateral movable membranes, the second opening / closing orifice passage at a different frequency. Can open and close the liquid column resonance in the first opening / closing orifice passage and the liquid column resonance generated at a different frequency by opening the second opening / closing orifice passage. Is possible.
[0010]
According to the invention of claim 3, by providing a plurality of combinations of the second opening / closing orifice passage, its opening / closing valve, and the laterally movable membrane provided with this, the dynamic spring bottom and the phase peak are controlled by controlling each at a different frequency. Since a plurality of vibrations can be generated on the high frequency side, the range of the low dynamic spring and the high phase can be further expanded to the high frequency side, and vibration can be cut off in a wider frequency range.
[0011]
According to the fourth aspect of the present invention, the compartments that individually divide the plurality of laterally movable films are arranged in series in the common control chamber, and the adjacent compartments are connected by the communication path provided on the compartment wall. If the internal air pressure is made variable by an external switching means through one passage provided in the compartment of the section, the effect of the air pressure switching is transmitted to each compartment with a time difference through the communication passage. Can be switched with a time difference. Therefore, even if a plurality of laterally movable films are provided, the means for operating them can be made common, so that the number of parts can be reduced and the cost can be reduced.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 is a schematic plan view of a dual control mount in the first embodiment, FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is a schematic cross-sectional view taken along line 3-3 in FIG. This dual control mount 10 has an elastic main body portion such as rubber between a first mounting member 11 attached to an engine (not shown) which is a vibration source and a second mounting member 12 attached to a vehicle body (not shown) which is a vibration receiving side. A main liquid chamber 14 is provided which is connected at 13 and has the elastic main body 13 as a part of the wall. The main liquid chamber 14 is always in communication with the sub liquid chamber 17 through an attenuation orifice 16 provided in the partition member 15. The auxiliary liquid chamber 17 is formed between the partition member 15 and the diaphragm 18. A known incompressible liquid is enclosed in the main liquid chamber 14 and the sub liquid chamber 17. The damping orifice 16 dampens vibration by generating liquid column resonance due to vibration in a relatively low frequency range (about 10 Hz) as in general traveling.
[0013]
The partition member 15 is provided with an idle orifice passage 20, the inlet 24 thereof opens to the main liquid chamber 14 (FIG. 3), and the outlet 25 faces the sub liquid chamber 17. The outlet 25 is opened and closed by bringing the central portion of the diaphragm 18 into contact with and separating from the opening / closing valve 21 which is an idle side opening / closing member. The on-off valve 21 forms a control chamber 22 which is a sealed space inside, and is connected to a switching member (not shown) such as a three-way valve through a passage 23 formed at the bottom, and is switched to connect to negative pressure and atmosphere. The outlet of the idle orifice passage 20 is opened and closed by moving the open / close valve 21 in the vertical direction in the figure. When the on-off valve 21 is opened, a liquid flow is generated in the idle orifice passage 20 and the liquid column resonates. This liquid column resonance is during idling that occurs on the higher frequency side than the target of the damping orifice 16, and thereby absorbs input vibration during idling.
[0014]
Further, a part of the elastic main body 13 facing the main liquid chamber 14 forms a first laterally movable film 26 that can be elastically deformed in accordance with fluctuations in the internal pressure of the main liquid chamber 14. By connecting the pipe portion 27a of the first sealed chamber 27 provided to the engine to the intake passage or the atmosphere of the engine by a switching member (not shown) such as a three-way valve, it can be elastically deformed freely in an open state, In the negative pressure state, the film rigidity is increased by being tightly fixed to the first stopper 28 in the first sealed chamber 27 so that the film cannot be elastically deformed or hardly elastically deformed. That is, the first laterally movable membrane 26 is a member having variable membrane stiffness, and the first sealed chamber 27 and the first stopper 28 serve as membrane stiffness variable means, and the first internal pressure controller 29 is formed as a whole.
[0015]
If the membrane rigidity of the laterally movable membrane 26 is lowered and freely elastically deformed at times other than idling, the spring can be lowered by absorbing the increase in the internal pressure of the main liquid chamber 14, and conversely, the inside of the sealed chamber 27 can be maintained in idling. If the membrane rigidity is increased by making a negative pressure and tightly fixing to the stopper 28, the amount of liquid fed from the main liquid chamber 14 into the idle orifice passage 20 can be increased and the energy of liquid column resonance can be increased.
[0016]
An umbrella member 19 integrated with the first mounting member 11 is provided in the main liquid chamber 14, and generates a liquid column resonance at about 600 Hz on the high frequency side of the liquid column resonance in the idle orifice passage 20 . In the case of a four-cylinder four-cycle engine, the frequency at the time of idling and starting is based on the secondary vibration. Therefore, when high-order vibration is taken into consideration, it is appropriate to define it by the engine speed. In this case, the idling time can be set to 500 to 1000 rpm, and the starting time can be set to 1000 to 2000 rpm.
[0017]
As apparent from FIG. 3, a second laterally movable film 36 and a second sealed chamber 37 are provided adjacent to the first internal pressure control unit 29, and a second stopper 38 is provided in the second sealed chamber 37. Yes. These form the second internal pressure control unit 39, and the first lateral movable film 26, the first sealed chamber 27, and the first stopper 28 constituting the first internal pressure control unit 29 have the same structure and are similarly operated and controlled. It functions similarly to the 1 internal pressure control unit 29.
[0018]
The inlet 24 of the idle orifice passage 20 is opened in the vicinity of the first lateral movable film 26 and the second lateral movable film 36 and at a substantially equal distance from each. The idle orifice passage 20 penetrates diagonally downward while drawing an arc in plan view from the entrance 24 toward the center of the partition member 15.
In FIG. 3, only the second mounting member 12 is representatively shown as a metal member constituting the peripheral wall portion of the mounting member 11, and other overlapping members are omitted (the same applies to FIGS. 5 and 6 below). ).
[0019]
Next, the operation of this embodiment will be described. FIG. 4 is a graph in which the horizontal axis is the common frequency, the dynamic spring constant (K) is shown in the upper part of the vertical axis, and the phase (°) is shown in the lower part. The solid line is the present example, and the two-dot chain line is the comparative example. In this embodiment, the second internal pressure control unit 39 is excluded (only the first internal pressure control unit 29 is provided).
[0020]
First, in the reference example, when starting from the idle state, the first sealed chamber 27 is set to a negative pressure to bring the first laterally movable film 26 into close contact with the first stopper 28 (hereinafter, this state is expressed as ON for the laterally movable film). The liquid spring resonance is generated by increasing the amount of liquid fed into the idle orifice passage 20, so that the first dynamic spring bottom B1 is generated in the vicinity of the oscillation region frequency (approximately 30 Hz) a. The phase is the first phase peak P1. Thereafter, when the first sealed chamber 27 is opened to the atmosphere at the frequency b on the higher frequency side and the first laterally movable film 26 is opened (hereinafter, this state is expressed as OFF for the laterally movable film), the dynamic spring constant becomes the plateau. It becomes constant in the state, and the phase drops to around 0 ° and becomes constant.
[0021]
On the other hand, in the present embodiment, the control of the first lateral movable film 26 is matched with the reference example, but the second lateral movable film 36 is turned off to the frequency a and turned on from the frequency a to the higher frequency side. As a result, since the second laterally movable film 36 is open to elastic deformation freely up to the frequency a, the internal pressure fluctuation in the main liquid chamber 14 is absorbed, and the dynamic spring bottom B1 is generated at a slightly higher value than the reference example. The dynamic spring constant becomes the maximum value at the frequency a, and the first phase peak P1 is generated with a numerical value lower than that of the reference example.
[0022]
Since the second laterally movable film 36 is fixed on the higher frequency side than the frequency a, the amount of liquid flowing into the idle orifice passage 20 is further increased. Therefore, the second idle orifice passage 20 is formed at the intermediate portion between the frequencies a and b. Liquid column resonance occurs, the second dynamic spring bottom B2 is generated, and the second phase peak P2 having the same height as the reference example is generated in the vicinity of the frequency b.
[0023]
Since the dynamic spring constant increases again at a frequency higher than the frequency b, both the first lateral movable film 26 and the second lateral movable film 36 are simultaneously turned off and opened. As a result, the dynamic spring constant becomes constant in the plateau state, and the phase decreases to near 0 ° and becomes constant.
[0024]
In this way, since the second dynamic spring bottom B2 is generated in the vicinity of the frequency b, the frequency range that becomes the low dynamic spring can be expanded, and the second phase peak P2 is generated in the vicinity of the frequency b. The range up to the frequency c can be set to a high phase, and as a result, transmission of vibrations to the vehicle body side can be effectively cut off in a wider frequency range than the reference example. These effects are caused by the combined action of the first lateral movable film 26 and the second lateral movable film 36.
[0025]
FIG. 5 is a view corresponding to FIG. 3 according to the second embodiment. In this example, the starting orifice on-off valve 40 is integrally attached to the second lateral movable membrane 36. The operation control of the second lateral movable film 36 is performed by providing the second sealed chamber 37 as in the previous embodiment and switching the inside to a negative pressure or open to the atmosphere. However, the second laterally movable film 36 can also be operated directly using mechanical means such as a solenoid.
[0026]
6 is a cross-sectional view taken along line 6-6 in FIG. 5. The starting orifice on / off valve 40 is integrated with the second laterally movable film 36, and the partition member 15 of the partitioning member 15 is changed according to the elastic deformation of the second laterally movable film 36. It is slidable in the radial direction on the surface, and opens and closes the entrance 42 of the starting orifice passage 41. The starting orifice passage 41 is a liquid passage that vertically penetrates the partition member 15 and communicates with the main liquid chamber 14 at the inlet 42 and communicates with the sub liquid chamber 17 at the outlet 43. 40 Hz vicinity).
[0027]
The starting orifice opening / closing valve 40 is in a position advanced by sliding inward in the radial direction of the partition member 15 in the open state in which the second lateral movable film 36 is OFF, and closes the inlet 42 of the starting orifice passage 41. In addition, the entrance 42 is broadly covered so that the entrance 42 can be closed to the extent that the second laterally movable film 36 is elastically deformed to absorb internal pressure. In the fixed state in which the second lateral movable film 36 is turned on, the starting orifice on / off valve 40 slides backward in the radial direction as the second lateral movable film 36 is elastically deformed to open the inlet 42. It is like that. The outlet 43 of the starting orifice passage 41 communicates with the auxiliary liquid chamber 17.
[0028]
Next, the operation of this embodiment will be described. In FIG. 4, the alternate long and two short dashes line shows this embodiment, and the first laterally movable film 26 is turned off from the idle frequency region to the frequency a, the frequencies a to c are turned on, and the frequency c is turned off again. On the other hand, the second lateral movable film 36 is turned off to the frequency a, turned on to the frequency d, and turned off on the high frequency side from d. The frequency d is higher than the frequency c.
[0029]
In this way, the first dynamic spring bottom B1 due to the liquid column resonance of the idle orifice passage 20 is generated in the vicinity of the frequency a as in the previous embodiment, and the first lateral movable film 26 and the second lateral movable film 36 are simultaneously turned on. On the higher frequency side than the frequency a, the liquid orifice resonance in the orifice passage 20 due to the increase in the liquid flow rate due to the fixing of the first laterally movable film 26 and the start orifice opening / closing valve 40 by fixing the second laterally movable film 36. By coupling the liquid column resonance generated in the starting orifice passage 41 by opening the inlet 42, a second dynamic spring bottom B2 is generated in the vicinity of the frequency c, and a second phase peak P2 is generated between the frequencies c and d. On the higher frequency side than the frequency d, the dynamic spring constant is constant in the plateau state, and the phase is reduced to near 0 ° and becomes constant.
[0030]
The second dynamic spring bottom B2 has a smaller dynamic spring constant than that of the previous embodiment and occurs on the higher frequency side. The second phase peak P2 also occurs on the higher phase and higher frequency side than in the previous embodiment. Therefore, the low dynamic spring region can be further expanded to the high frequency side than the previous embodiment, the phase can be increased to the higher phase, and the high phase region can be expanded to the high frequency side. Transmission can be blocked more effectively. At this time, the coupling effect can be expanded to a wider frequency range by making the resonance frequency of the orifice passage 20 different from the resonance frequency of the starting orifice passage 41.
[0031]
FIG. 7 relates to the third embodiment and is a view corresponding to FIG. 6. In this example, a third internal pressure control unit 59 similar to the second internal pressure control unit 39 is added to the previous embodiment. is there. That is, the third internal pressure control unit 59 is provided adjacent to the second internal pressure control unit 39, and the third lateral movable film 56 and the third sealed chamber 57 are provided. The third sealed chamber 57 is integrally formed in the case 51 shared with the second sealed chamber 37, and communicates with each other through a communication portion 55 formed of a jet or a small hole formed in the partition wall 54 of both chambers. By connecting the passage 54 provided in the wall portion of the second sealed chamber 37 in the case 51 to the switching means, when the second sealed chamber 37 is opened to the negative pressure or the atmosphere, the third sealed chamber 57 forms a time difference. It is designed to be exposed to negative pressure or the atmosphere.
[0032]
A second starting orifice opening / closing valve 50 is integrally attached to the third laterally movable film 56, and opens and closes the inlet 52 of the second starting orifice passage formed in the partition member 15. The structures and functions of the third laterally movable film 56, the second starting orifice opening / closing valve 50, and the second starting orifice passage are the same as those of the second control unit 39. However, the resonance frequency of the second starting orifice passage is set higher than that of the starting orifice passage 41.
[0033]
In this case, as shown in FIG. 8, the dynamic spring constant is further increased to the higher frequency side in addition to the first dynamic spring bottom B 1 by the orifice passage 20 and the second dynamic spring bottom B 2 by the starting orifice passage 41. A third dynamic spring bottom B3 can be generated by the starting orifice passage. Similarly, in addition to the first phase peak P1 and the second phase peak P2, the phase can cause the third phase peak P3 to occur at a higher phase on the higher frequency side.
[0034]
Therefore, transmission of vibration to the vehicle body side can be effectively cut off in a wider frequency range. In addition, since the negative pressure or air switching means for the second sealed chamber 37 and the third sealed chamber 57 can be shared, the overall cost can be reduced.
[0035]
The present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the principle of the invention. For example, the number of the lateral movable films may be any number as long as it is a plurality of 2 or more, and the effect can be expanded to a wider frequency range as the number is increased. Moreover, the combination of the one with and without the starting orifice opening / closing valve can be freely performed. However, it is more preferable to use a start orifice opening / closing valve in which a dedicated start orifice passage can be provided individually because the setting can be facilitated. Further, when the starting orifice opening / closing valve is provided, it is not always necessary to attach the starting orifice opening / closing valve to the lateral movable membrane, and a simple opening / closing valve operated by an actuator such as a solenoid can be obtained. However, in this case, not all the control units are open / close valve type, but at least one or more of the plurality of control units is a laterally movable film so that the internal pressure absorbing effect can be maintained. Further, the present invention can be applied to a vibration isolator other than the engine mount, for example, for a suspension, etc., and can be applied to various vibration isolating uses other than for a vehicle.
[Brief description of the drawings]
FIG. 1 is a schematic plan view of an engine mount according to the present invention. FIG. 2 is a cross-sectional view taken along the line 2-2 in FIG. 1 according to a first embodiment. FIG. 4 is a graph showing the operation of the first and second embodiments. FIG. 5 is a diagram corresponding to FIG. 3 according to the second embodiment. FIG. 6 is a sectional view taken along the line 6-6 in FIG. FIG. 7 is a diagram corresponding to FIG. 5 according to the third embodiment. FIG. 8 is a graph showing the operation of the third embodiment.
10: engine mount, 15: partition member, 20: idle orifice passage (first opening / closing orifice passage), 21: opening / closing valve, 24: inlet, 25: outlet, 26: first laterally movable membrane, 27: first sealed chamber 28: 1st stopper, 29: 1st control part, 36: 2nd lateral movable film | membrane, 37: 2nd sealed chamber, 38: 3rd stopper, 39: 2nd control part, 40: Starting orifice on-off valve (opening / closing Members), 41: starting orifice passage (second opening / closing orifice passage), 50: second starting orifice opening / closing valve (opening / closing member), 52: entrance of the second starting orifice passage, 56: third laterally movable membrane, 57: first 3 sealed chambers, 59: third control unit, 56: third laterally movable membrane

Claims (4)

A first mounting member that is mounted on either the vibration generation side or the vibration receiving side, a second mounting member that is mounted on the other side, an elastic main body member that is interposed therebetween, and the elastic main body member that is attached to the wall A main liquid chamber that is a part of the first liquid chamber, and a sub liquid chamber that is partitioned by the main liquid chamber and a partition member and is covered with a flexible membrane member. In the liquid seal vibration isolator connected through the opening and closing orifice passage,
A plurality of laterally movable membranes for absorbing internal pressure are provided on the peripheral wall surrounding the main liquid chamber, each facing the main liquid chamber, and allowing free elastic deformation at a frequency in the starting region higher than the idle region. A liquid-sealed vibration isolating device characterized in that it can be switched between an open state and a fixed state that restricts free elastic deformation, and the state of these laterally movable membranes is switched at different frequencies .  2. The liquid seal vibration isolator according to claim 1, wherein an opening / closing valve of a second opening / closing orifice passage provided separately from the first opening / closing orifice passage is provided in any of the lateral movable films.  3. The liquid seal vibration isolator according to claim 2, wherein a plurality of the second open / close orifice passage, the open / close valve, and a plurality of laterally movable films provided with the open / close valve are provided. The laterally movable membrane includes a plurality of adjacent movable membranes that are surrounded by a common control chamber. The laterally movable membrane is divided into laterally movable membranes, and the compartments are arranged in series. 2. The liquid according to claim 1, wherein the internal air pressure is made variable through one passage connected to the external switching means provided in the compartment at one end and connected to the communication passage provided at the end. Seal vibration isolator.

Images