JP4716607B2 - 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.
[0002]
[Prior art]
As such a liquid seal engine mount, an idle orifice passage is provided between the main liquid chamber and the sub liquid chamber, and a part of the diaphragm constituting the sub liquid chamber is used as a seating portion. time to close the opening of the idle orifice passage seat by the pushing of the pressing member, by the this pressing member during idling opens the seat, the idle orifice passage seat is to open the opening of the idle orifice passage A structure that is configured to open is known (see JP-A-10-281214 as an example).
[0003]
[Problems to be solved by the invention]
When the orifice passage opening / closing means is provided as described above, noise may be generated by the opening / closing means. For example, in the case of the idle orifice passage described above, if a large vibration is input when the engine is started or stopped in a closed state, the elastic main body is greatly elastically deformed to positively or negatively pressure the main liquid chamber. As a result, sudden internal pressure fluctuations may occur, resulting in a cavitation phenomenon in which air is generated as a large number of bubbles in the liquid. When this phenomenon occurs, the opening / closing means that closes the orifice passage is pushed away to the side of the secondary liquid chamber, or conversely, is strongly adsorbed to the side of the main liquid chamber. . SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to suppress the generation of abnormal noise by an opening / closing means based on fluctuations in the internal pressure of the main fluid chamber when the engine is started or stopped.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the invention relating to the liquid seal vibration isolator of the present application connects the main liquid chamber and the sub liquid chamber partitioned by the partition member by the damping orifice passage and the idle orifice passage , and the idle orifice passage by the opening / closing member. In the liquid seal vibration isolator which can be opened and closed, an elastically deformable lateral membrane is provided on the side wall facing the main liquid chamber of the elastic main body, the lateral membrane is deformed inward and outward by an actuator , and the lateral membrane is deformed. Is linked to the engine vibration waveform to control changes in the internal pressure of the main fluid chamber ,
When the engine is stopped or started, the actuator is operated to reduce the movement of the open / close member in the closed state or to deform the lateral membrane in the canceling direction.
[0005]
At this time, the actuator, when the elastic body section deforms by engine vibration can also be operated as a horizontal membrane pressure change in the main fluid chamber increases.
[0006]
Furthermore, the Yokomaku during idling can also be operated to reduce or cancel Direction movement likewise closing member and above. Further, from the idle state during normal driving after the transition to the starting state, the actuator can also so that is freely elastically deformed according to the transverse film changes in internal pressure in the main liquid chamber.
[0007]
【The invention's effect】
Since the movement of the diaphragm is linked to the vibration waveform of the engine, when the change in the internal pressure of the main fluid chamber is a positive vibration (hereinafter referred to as + vibration), the diaphragm is deformed outwards and negatively reversed. In the direction of pressure (hereinafter referred to as -vibration), by deforming inward, a sudden change in the internal pressure of the main liquid chamber is prevented, and the generation of noise due to interference between the partition member and the opening / closing member is suppressed. .
[0008]
By controlling the lateral membrane by operating the actuator at the start and stop of the engine, a sudden change in internal pressure of the main liquid chamber at the start and stop of the engine is prevented, thereby suppressing the generation of abnormal noise.
[0009]
When deformed elastic body section by the engine vibration, increasing the internal pressure in the main liquid chamber by deforming the lateral film, the liquid column resonance in the damping orifice passage by increasing the amount of liquid flowing into the damping orifice passage, the damping effect increases To improve riding comfort.
[0010]
When the same control is performed during idling, the amount of liquid flowing into the idle orifice passage is increased, and the minimum value of the dynamic spring due to liquid column resonance in the idle orifice passage is reduced to reduce the dynamic spring.
[0011]
When the actuator during normal driving is Ru is freely elastically deformable lateral membrane according transverse film changes in internal pressure in the main liquid chamber, the lateral film absorbs this freely elastically deformed according to the change in the internal pressure in the main liquid chamber Therefore, a low dynamic spring is realized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment will be described below with reference to the drawings. FIG. 1 is a full sectional view of a liquid ring engine mount according to the present embodiment, FIG. 2 is an exploded view of components, FIG. 3 is an enlarged view of a lateral membrane portion, and FIG. 4 is a graph showing the control method.
[0013]
1 and 2, the engine mount includes a first mounting member 1, a second mounting member 2, and an elastic main body 3. The first mounting member 1 is an engine that is a vibration source by screws. The second attachment member 2 is attached to the vehicle body by a flange 4.
[0014]
The flange 4 is connected to a metal working chamber cylinder 6 surrounding the opening / closing means chamber 5, and its upper end is coupled to the main liquid chamber cylinder 7 by caulking. The main liquid chamber tube portion 7 is integrated with the bottom portion of the elastic main body portion 3, and the lining portion 8 formed integrally with the elastic main body portion 3 is formed on the inner surface thereof.
[0015]
A part of the side surface of the main liquid chamber tube portion 7 is a circular hole 9, and the lining portion 8 of the hole 9 portion forms a lateral membrane portion 10 that can be elastically deformed outwardly through the hole 9. The transverse membrane part 10 is for absorbing fluctuations in the internal pressure of the main liquid chamber 13, and the elastic deformation of the transverse membrane part 10 may be controlled by an operating means such as a solenoid if necessary.
[0016]
A liquid chamber is formed in a space surrounded by the first mounting member 1, the second mounting member 2, and the elastic main body 3, and the interior thereof is opened and closed with the main liquid chamber 13 on the elastic main body 3 side by a partition member 12. It is divided into a secondary liquid chamber 14 on the means chamber 5 side. The auxiliary liquid chamber 14 is formed between the diaphragm 15 in the opening / closing means chamber 5 and the partition member 12.
[0017]
The main liquid chamber 13 is filled with an incompressible liquid, and is communicated with a damping orifice passage 16 and a freely openable / closable idle orifice passage 17 which are always in communication with the sub liquid chamber 14. The opening 18 on the secondary liquid chamber 14 side of the idle orifice passage 17 is opened and closed by a thick seat 20 formed at the center of the diaphragm 15. The seat 20 is in close contact with or opened to the partition member 12 by the pressing member 21. The opening of 18 is controlled.
[0018]
As is apparent from FIG. 2, the partition member 12 includes a resin-made circular table-like upper portion 22 that protrudes greatly into the main liquid chamber 13, an intermediate portion 23 made of an elastic member such as rubber, and a metal made of aluminum die casting. The lower part 24 is combined.
[0019]
A flange 25 is formed on the outer peripheral portion of the upper portion 22, a part of which is a concave portion 26 that forms the damping orifice passage 16, and an outermost peripheral portion is a fixed portion 27. In addition, a substantially spiral passage 28 opened downward is formed in the central portion, one end of which communicates with the opening 18 and the other end communicates with the main liquid chamber 13.
[0020]
The intermediate portion 23 includes a tapered portion 30 that gradually increases in thickness toward the outer peripheral side, and a concave groove 31 formed on the outer peripheral side, and the outermost peripheral portion is a standing wall 32 that forms the outer wall of the concave groove 31. The concave groove 31 is combined so as to face the concave portion 26, and forms an upper stage portion of the damping orifice passage 16 inside. The upper end of the standing wall 32 is a cushion flange 33 that protrudes radially outward.
[0021]
The damping orifice passage 16 is formed in a spiral shape between the upper part 22 and the intermediate part 23 and between the intermediate part 23 and the lower part 24, one end communicating with the main liquid chamber 13 and the other end with the sub liquid chamber 14. Communicate. This characteristic is set so that the liquid column resonates with respect to low-frequency vibration during general traveling.
[0022]
Of the contact portion between the upper portion 22 and the intermediate portion 23, the inner portion thereof faces the damping orifice passage 16 and forms a tapered joint portion 29 (FIG. 1). Further, the fixing portion 27 overlaps the cushion flange 33 of the standing wall 32.
[0023]
The lower portion 24 has an opening 18 at the center, a recessed groove 34 is formed below the recessed groove 31, and a lower portion of the damping orifice passage 16 is formed between the recessed groove 34 and the intermediate portion 23. The outermost peripheral portion of the intermediate portion 23 forms a standing wall 35 and overlaps the outside of the standing wall 32, and the upper end is in contact with the lower surface of the cushion flange 33.
[0024]
Diaphragm 15 made of an appropriate flammable material such as rubber is integrated with a mounting ring 36 whose outer peripheral portion has a substantially crank-shaped cross section, and forms an elastic peripheral wall 37 extending upward along the inner surface thereof. The upper end 38 of the mounting ring 36 is sandwiched between the working chamber cylinder portion 6 and the main liquid chamber cylinder portion 7 and is integrally fixed by caulking.
[0025]
Thus, the partition member 12 is sandwiched and fixed between the caulking flange 7a (FIG. 2) of the main liquid chamber tube portion 7 and the inward flange 39 (FIG. 2) formed at the lower end of the mounting ring 36, and the cushion flange 33 And is supported by the elastic peripheral wall 37 for floating.
[0026]
The pressing member 21 without projecting center upward in a cylindrical shape, a shape surrounding spreads to the left and right, the whole is covered with an air-impermeable flexible membrane 40, the wall thickness made of an elastic material such as rubber at the center thereof The pressing part 41 is integrally formed.
[0027]
The abutting parts 41 metal plate 42 that is integrated with one end is provided along the inner side of the flexible membrane 40, the other end of the outer peripheral portion and the thickened portion 43 which is the outer peripheral portion of the flexible membrane 40 It is integrated.
[0028]
The periphery of the thick end portion 43 is integrally crimped by the fixing ring 44 on the outer peripheral portion and the entire periphery of the resin bottom plate 45. Together form a vacuum chamber 46 to form a closed space between Thereby flexible film 40 and the bottom plate 45, for communicating the intake path of an engine (not shown) in the central portion of the bottom plate 45 and the negative pressure chamber 46 A joint pipe 47 is formed.
[0029]
A coil spring 48 is provided between the periphery of the joint pipe 47 and the pressing portion 41, and when the negative pressure chamber 46 is opened to the atmosphere, the pressing portion 41 is pushed up so that the seating portion 20 is opened to the opening 18 in the lower portion 24. When pressed against the periphery and connected with a negative pressure, the pressing portion 41 is pushed down against the coil spring 48 and the seating portion 20 opens the opening 18.
[0030]
FIG. 6 is a plan view showing the pressing member 21 from above in FIG. 2. As is clear from this figure, a circular recess 49 is provided in the center of the upper surface of the pressing member 21 that contacts the seating portion 20. . The circular recess 49 communicates with a cross-shaped groove 49a that reaches the outer periphery and is open.
[0031]
As shown in FIG. 3, the actuator 11 made of a solenoid or the like extends a telescopic rod 50, and an enlarged head 51 at the tip thereof is embedded and integrated in the lateral membrane 10. The actuator 11 is driven and controlled by the control unit 52.
[0032]
The control unit 52 detects the on / off of the ignition switch, the engine speed, the engine vibration, and the like to drive the actuator 11 to deform the lateral membrane 10 inward and outward as indicated by a virtual line. When the lateral membrane 10 is deformed to project inward, the internal pressure of the main liquid chamber 13 increases, and conversely, when the lateral membrane 10 is deformed outward, the internal pressure of the main liquid chamber 13 decreases. This control is shown in FIG.
[0033]
FIG. 4 shows the engine waveform in the upper stage and the deformation of the transverse membrane 10 in the lower stage. In each case, the vertical axis represents the displacement amount, and + and − correspond to + vibration and −vibration, respectively. The horizontal axis represents time, and control is performed by linking the lateral membrane 10 to the engine waveform only for a predetermined time T when the engine vibration is attenuated.
[0034]
That is, when the engine vibration starts from + vibration, the lateral membrane 10 is displaced in the-direction, and when the engine subsequently vibrates with a large amplitude A, the lateral membrane 10 becomes a large displacement amount B corresponding to the amount of change + Displace the direction. Thereafter, control is performed within the control time T such that the displacement is in the opposite direction to the vibration direction of the engine and corresponding to the amplitude.
[0035]
This control is performed so that the volume in the main liquid chamber 13 is constant, and the signal that is the basis of the control is based on the accelerometer detection signal that detects engine vibration, and the direction and amplitude are detected based on the vibration detection amount. it can.
[0036]
in this way. Since the movement of the lateral membrane 10 is linked to the vibration waveform of the engine, when the internal pressure change of the main liquid chamber 13 is a vibration in the direction of positive pressure (hereinafter referred to as + vibration), the lateral membrane 10 is deformed outward, Conversely, when the vibration is in the direction of negative pressure (hereinafter, referred to as “−vibration”), it is deformed inward to prevent a sudden change in the internal pressure of the main liquid chamber 13, and the partition member 12 and the seating portion 20 that is an opening / closing member. Generation of abnormal noise due to interference can be suppressed.
[0037]
Further, by controlling the lateral membrane 10 by operating the actuator 11 when the engine is started and stopped, it is possible to prevent a sudden change in internal pressure of the main liquid chamber 13 during the start and stop of the engine, thereby suppressing the generation of abnormal noise. .
[0038]
Additionally, when deformed elastic body member 3 by the engine vibration and to deform the lateral film 10 increase the internal pressure of the main liquid chamber 13, in the damping orifice passage 16 by increasing the amount of liquid flowing into the damping cage Fi scan path 16 The liquid column resonance improves the riding comfort by increasing the damping effect.
[0039]
In addition, when the same control as described above is performed during idling, the amount of liquid flowing into the idle orifice passage 17 can be increased, and the minimum value of the dynamic spring due to the liquid column resonance in the idle orifice passage 17 can be reduced to reduce the dynamic spring.
[0040]
Further, when the actuator 11 frees the transverse membrane 10 during general traveling, the transverse membrane 10 freely elastically deforms and absorbs it in accordance with the change in the internal pressure of the main liquid chamber 13, so that a low dynamic spring can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an engine mount according to an embodiment. FIG. 2 is a partially enlarged view of the engine mount. FIG. 3 is an enlarged view of a lateral membrane portion.
3: Elastic body member, 10: Transmembrane, 11: Actuator, 12: Partition member, 13: Main liquid chamber, 14: Sub liquid chamber, 15: Diaphragm, 16: Damping orifice passage , 17: Idle orifice passage , 20: Seating part

Claims (4)

A main liquid chamber of an elastic main body part in a liquid seal vibration isolator in which a main liquid chamber and a sub liquid chamber partitioned by a partition member are connected by a damping orifice passage and an idle orifice passage , and the idle orifice passage can be opened and closed by an opening / closing member. An elastically deformable lateral membrane is provided on the side wall facing the surface, and this lateral membrane is deformed inward and outward by an actuator , and the deformation of the lateral membrane is controlled by linking with the engine vibration waveform to change the internal pressure of the main fluid chamber. as well as control,
A liquid-sealed vibration isolating device characterized in that when the engine is stopped or started, the actuator is operated to reduce the movement of the open / close member in a closed state or to deform the lateral membrane in a canceling direction. 2. The liquid ring vibration isolator according to claim 1, wherein when the elastic main body portion is deformed by engine vibration at the time of resonance of the damping orifice passage , the transverse membrane is operated so that a change in internal pressure of the main liquid chamber is increased. 2. The liquid ring vibration isolator according to claim 1 , wherein the diaphragm is actuated so that a change in internal pressure of the main liquid chamber is increased during idling. 2. The liquid seal vibration isolator according to claim 1, wherein the transverse membrane is freely elastically deformed in accordance with a change in the internal pressure of the main liquid chamber during general running after transition from the idle state to the start state.

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