JP4676096B2 - 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. At times, the opening of the idle orifice passage is closed at the seating portion by the pressing of the pressing member, and when the idling member is idle, the opening of the idle orifice passage is opened by the pressing member opening the seating portion by K. An apparatus 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, the present invention has an object to prevent the generation of noise by the opening / closing means based on the fluctuation of the internal pressure of the main liquid chamber when the engine is started or stopped.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the first invention related to the liquid seal vibration isolator of the present application includes a first attachment member attached to the vibration source side, a second attachment member attached to the vehicle body side, and a gap therebetween. A substantially conical elastic main body provided, and a liquid chamber having the elastic main body as a part of a wall is formed, and the liquid chamber is partitioned into a main liquid chamber and a sub liquid chamber by a partition member. In the liquid seal vibration isolator in which an orifice passage communicating the main liquid chamber and the sub liquid chamber is formed in the partition member, the partition member includes a first member whose outer peripheral portion is fixed to the second mounting member, and a first member Between the upper part facing the main liquid chamber and the lower part facing the sub liquid chamber, an intermediate part made of an elastic member such as rubber is sandwiched between the two members.
The intermediate part forms part of the orifice passage together with the upper part,
The upper portion has a flange on the outer peripheral portion, and the outermost peripheral portion is a fixed portion. Further, the fixed portion restricts movement of the first member to the main liquid chamber side by abutting from the main liquid chamber side. And
The outer peripheral part of the intermediate part forms a cushion flange and overlaps the fixed part,
The outer peripheral portion of the lower portion is in contact with the lower surface of the cushion flange, and is further supported from the sub liquid chamber side by the second member,
When the partition member moves toward the main liquid chamber, movement of the upper portion is restricted by the fixing portion, and the lower portion compresses the cushion flange and moves to the main liquid chamber side.
[0005]
In a second aspect based on the first aspect, the orifice passage includes a first orifice passage that is always in communication with the main liquid chamber and the sub liquid chamber, and a second orifice passage that is opened and closed by an opening / closing means. In addition, as a means for opening and closing the second orifice passage, a seat portion provided in a diaphragm constituting the sub liquid chamber and a pressing member that presses this with a return spring are provided, and a rigid plate is integrated with the pressing member. The one end portion of the return spring is floatingly supported by the elastic material.
[0006]
【The invention's effect】
According to the first invention, the outer peripheral portion of the partition member is supported by floating by supporting the partition member via the elastic member, and the partition member has an upper portion facing the main liquid chamber and a lower portion facing the sub liquid chamber, An intermediate part made of an elastic member such as rubber is sandwiched between them, so that if there is a large vibration input accompanying the start or stop of the engine, for example, the partition member will move as the internal pressure changes in the main liquid chamber Absorbs fluctuations in internal pressure. For this reason, sudden internal pressure fluctuations in the main liquid chamber can be suppressed and the occurrence of cavitation can be prevented, so that the generation of abnormal noise can be reduced.
[0007]
According to the second invention, since the return spring of the pressing member is floatingly supported, the force input from the return spring to the rigid plate constituting the pressing member is reduced, and as a result, abnormal noise is generated in the plate. Even this can be reduced. In addition, when the return spring resonates, the input from the return spring to the plate is the same.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment will be described below with reference to the drawings. 1 is an overall 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 sectional view showing a fixing member structure of a partition member, and FIG. 4 is an enlarged sectional view of a pressing member. It is. In the following description, the top, bottom, left and right of the liquid seal vibration isolator are expressed with reference to the state of FIG.
[0009]
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.
[00010]
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.
[00011]
A part of the side surface of the main liquid chamber cylinder portion 7 is a circular hole 9, and the lining portion 8 of the hole 9 portion forms a lateral membrane portion 10 that is elastically deformable inward and outward 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.
[0012]
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.
[0013]
An incompressible liquid is sealed in the liquid chamber, and the main liquid chamber 13 is connected to a sub-liquid chamber 14 through a damping orifice passage 16 and a freely openable / closable idle orifice passage 17. The opening 18 on the side of the secondary liquid chamber 14 in the idle orifice passage 17 is opened and closed by a thick seat 20 formed at the center of the diaphragm 15, and the seat 20 is surrounded by the pressing member 21 around the opening 18 of the partition member 12. The opening 18 is closed by being pressed and closely contacted, and conversely, the pressing member 21 is pulled down to be separated from the partition member 12 to be opened.
[0014]
As is apparent from FIG. 2, the partition member 12 includes a resin-made circular table-like upper part 22 that protrudes largely into the main liquid chamber 13, an intermediate part 23 made of an elastic member such as rubber, and a metal made of aluminum die casting or the like. The lower part 24 made of the product is combined.
[0015]
A flange 25 is formed on the outer peripheral portion of the upper portion 22, a part of which is a ceiling 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.
[0016]
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 ceiling portion 26 to form 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.
[0017]
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 the low-frequency vibration during the one-step traveling.
[0018]
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.
[0019]
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.
[0020]
Diaphragm 15 made of an appropriate flammable material such as rubber is integrally formed with a mounting ring 36 having a substantially crank-shaped cross section at an outer peripheral portion, and an elastic peripheral wall 37 extending upward along the inner surface thereof is formed. The elastic peripheral wall 37 extends upward along the outside of the standing wall 35, and the outer peripheral end of the fixed portion 27 contacts the inner peripheral surface of the upper end portion. The upper end 38 of the mounting ring 36 is sandwiched between the working chamber tube portion 6 and the main liquid chamber tube portion 7 and is integrally fixed by caulking.
[0021]
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 floating by the elastic peripheral wall 37.
[0022]
The pressing member 21 has a shape in which the center protrudes upward in a columnar shape, the periphery spreads to the left and right, is entirely covered with a non-breathable flammable film 40, and has a thick wall made of an elastic body such as rubber at the center. The pressing part 41 is integrated. Further, a metal plate 42 whose one end is integrated with the pressing portion 41 is provided along the inner side of the sinterable film 40, and the other end of the outer peripheral part is a thick end part 43 which is the outer peripheral part of the sinterable film 40. And integrated.
[0023]
The periphery of the thick end portion 43 is caulked and integrated around the entire periphery together with the outer peripheral portion of the resin bottom plate 45 by the fixing ring 44. As a result, a sealed space is formed between the combustible film 40 and the bottom plate 44 to form the negative pressure chamber 46, and the negative pressure chamber 46 and an engine intake passage (not shown) communicate with the center of the bottom plate 44. A joint pipe 47 is formed.
[0024]
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. Reference numeral 49 denotes a recess provided on the surface of the pressing member 21 that contacts the seating portion 20.
[0025]
As shown in FIG. 3, the partition member 12 is floatingly supported by being sandwiched between the working chamber tube portion 6 and the main liquid chamber tube portion 7 via the cushion flange 33 and the elastic peripheral wall 37. That is, the flange 25 which is the outer peripheral portion of the upper portion 22 can be moved downward in the figure by the cushion flange 33 and the elastic peripheral wall 37, and the lower portion 24 is because the standing wall 35 on the outer peripheral side abuts the cushion flange 33 and the elastic peripheral wall 37 vertically. It can be moved in the vertical direction in the figure.
[0026]
Therefore, when + vibration is applied into the main liquid chamber 13, the cushion flange 33 and the elastic peripheral wall 37 are compressed, and the entire partition member 12 moves downward in the figure, thereby preventing a rapid change in internal pressure of the main liquid chamber 13. On the contrary, when -vibration is applied, the lower part 24 of the partition member 12 compresses the cushion flange 33 and moves upward in the figure, and also prevents sudden fluctuations in the internal pressure of the main liquid chamber 13. However, since the upper part 22 of the partition member 12 is directly fixed upward by the caulking flange 7a, the upward movement is restricted.
[0027]
As shown in FIG. 4, the upper end of the coil spring 48 abuts against the pressing portion 41. The pressing portion 41 is an elastic member, and the coil spring 48 is floatingly supported by the pressing portion 41. Therefore, when force or vibration of the pressing member 21 is applied, force or vibration is transmitted from the coil spring 48 to the metal plate 42 via the pressing portion 41. At this time, because of the floating support by the pressing portion 41, metal Transmission of force and vibration to the plate 42 is greatly reduced.
[0028]
On the other hand, the metal plate 42 is a rigid member having a substantially trumpet shape, and functions as a kind of speaker when vibration is transmitted to the metal plate 42. Therefore, the generation of noise from the metal plate 42 is reduced by floatingly supporting the coil spring 48 to reduce vibration transmission to the metal plate 42. In addition, when the pressing member 21 and the seating portion 20 are moved up and down relatively violently, the coil spring 48 also resonates. However, vibration transmission to the metal plate 42 at the time of the resonance is also reduced, and noise is similarly generated. Reduce.
[Brief description of the drawings]
FIG. 1 is an overall cross-sectional view of an engine mount according to an embodiment. FIG. 2 is an exploded view of a main part. FIG. 3 is an enlarged cross-sectional view showing a floating support structure of a partition member. Sectional drawing showing enlarged view [Explanation of symbols]
1: 1st attachment member, 2: 2nd attachment member, 3: elastic body part, 6: working chamber cylinder part, 7: main liquid chamber cylinder part, 10: transverse membrane part, 12: partition member, 13: Main liquid chamber, 14: Sub liquid chamber, 15: Change in internal pressure, 16: Damping orifice passage, 17: Idle orifice passage, 18: Opening, 20: Seating portion, 21: Pressing member, 22: Upper portion, 23: Intermediate portion, 24: Lower part, 33: Cushion flange, 37: Elastic peripheral wall, 41: Pushing part, 42: Metal plate, 48: Coil spring

Claims (3)

A first attachment member (1) attached to the vibration source side, a second attachment member (2) attached to the vehicle body side, and a substantially conical elastic main body (3) provided therebetween are provided. A liquid chamber having the elastic main body (3) as a part of a wall is formed, and the liquid chamber is partitioned into a main liquid chamber (13) and a sub liquid chamber (14) by a partition member (12). In the liquid seal vibration isolator having an orifice passage (16, 17) communicating between the liquid chamber and the auxiliary liquid chamber formed in the partition member,
The partition member (12) is sandwiched and fixed between a first member (7) and a second member (36) whose outer peripheral portions are fixed to the second mounting member (2), and a main liquid chamber (13). An intermediate part (23) made of an elastic member such as rubber is sandwiched between the upper part (22) facing the lower part (24) and the lower part (24) facing the sub liquid chamber (14),
The intermediate part (23) forms part of the orifice passage (16) together with the upper part (22),
The upper part (22) has a flange (25) on the outer peripheral part, and the outermost peripheral part is a fixing part (27). Further, the fixing part (27) has the first member (7) in the main liquid chamber ( 13) The movement to the main liquid chamber (13) side is regulated by contacting from the side,
The outer peripheral part of the intermediate part (23) forms a cushion flange (33) and overlaps the fixing part (27),
The outer peripheral portion (35 ) of the lower portion (24) abuts on the lower surface of the cushion flange (33), and is further supported from the sub liquid chamber (14) side by the second member (36),
When the partition member (12) moves toward the main liquid chamber (13), the movement of the upper part (22) is restricted by the fixing part (27), and the lower part (24) is the cushion flange (33). Is compressed and moved to the main liquid chamber (13) side. When the intermediate portion (23) is a first elastic member, the first elastic member (23) and another second elastic member (37) are connected to the lower portion (24) and the second member (36). And the second elastic member (37) supports the outer peripheral portion of the partition member (12) in a floating manner,
The liquid seal vibration isolator according to claim 1, wherein the first elastic member (23) and the second elastic member (37) support the partition member (12) in a floating floating manner. . The orifice passage includes a first orifice passage (16) that is always in communication with the main liquid chamber (13) and the sub liquid chamber (14), and a second orifice passage (17) that is opened and closed by an opening / closing means. ,
As a means for opening and closing the second orifice passage (17), a seating part (20) provided in a diaphragm (15) constituting the sub liquid chamber (14) and a pressing member for pressing the seating part (20) by a return spring (48) (21), and the pressing member (21) is made of an elastic material in which a rigid plate (42) is integrated, and one end of the return spring (48) is floatingly supported. The liquid seal vibration isolator according to claim 1 or 2.

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