JP3716869B2 - Liquid filled mount - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a liquid-filled mount used for vibration-proofing and supporting a vibrating body such as an automobile engine.
[0002]
[Prior art]
As shown in FIG. 5, conventionally, a liquid-sealed mount has a shock orifice a that absorbs vibrations of low frequency and large amplitude (frequency 10 Hz or less, amplitude about ± 1 mm), and high frequency small amplitude (amplitude about ± 0). .05 mm) and a sub-diaphragm b that suppresses vibration (see Japanese Patent Publication No. 62-53735).
[0003]
However, when idling vibration (frequency 20 to 30 Hz, amplitude about ± 0.2 mm) generated in the idling rotation region is input to the liquid-sealed mount, the working fluid does not flow through the shock orifice a, and the sub-diaphragm b Since the resonance movement does not occur, the internal pressure rises and the dynamic spring constant increases. Therefore, the above prior art has a problem that engine vibration (idle vibration) is largely transmitted in the idling speed range.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and an object thereof is to provide a liquid-sealed mount that has a low dynamic spring constant with respect to idle vibration and can effectively absorb and suppress idle vibration.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the liquid-sealed mount of the present invention has one attachment portion and the other attachment portion connected via an elastic body made of a rubber-like elastic material and a diaphragm connected to the other attachment portion. An airtight space, and first and second partition portions are provided in the airtight space, and the airtight space is divided into a first space on one attachment portion side, a second space between the partition portions, and a third space on the diaphragm side. Partitioning into a space, providing a second partition made of rubber-like elastic material in the second space to partition the second space into an inner space and an outer space, and the first space as the first liquid chamber The outer peripheral side space is a second liquid chamber, and the second partition portion is provided with a communication portion that communicates the inner peripheral side space and the third space, so that the inner peripheral side space and the third space are third. Activated when idle vibration is input to the first liquid chamber and the second liquid chamber. Communicated via the idle orifice flows, and the third liquid chamber and the second liquid chamber communicate with each other via the shock orifice, the actuating said shock orifice through the second liquid chamber to the idle orifice The sub-diaphragm is arranged between the first liquid chamber and the third liquid chamber so that the liquid can flow in series .
[0006]
[Action]
When the idle vibration generated in the idle rotation region is input to the liquid-sealed mount of the present invention having the above-described configuration, the working fluid flows through the idle orifice communicating with the first liquid chamber and the second liquid chamber. The dynamic spring constant with respect to idle vibration can be made lower than before. In addition, the shock orifice and the sub-diaphragm operate in response to vibrations of low frequency and large amplitude and high frequency and small amplitude.
[0007]
【Example】
Next, embodiments of the present invention will be described with reference to the drawings.
[0008]
As shown in FIG. 1, one attachment portion 1 having a center boss 2 and the other attachment portion 3 having a case 4 are connected via an elastic body (also referred to as a rubber pedestal) 5 made of a rubber-like elastic material. A diaphragm 6 made of rubber-like elastic material is connected to the other mounting portion 3 with an outer peripheral edge portion 6a, and an airtight space 7 is provided inside the mount so as to be surrounded by the outer peripheral edge portion 6a. A first partition part 8 provided with the first and second orifice plates 9 and 10 and connected to the other mounting part 3, and a third orifice plate 12 provided with the other part on the diaphragm 6 side of the first partition part 8 By the second partition part 11 connected to the attachment part 3, the first space 13 on the one attachment part 1 side, the second space 14 between the partition parts 8 and 11, and the third space 15 on the diaphragm 6 side. The first partition 8 and the second partition 11 A second partition 14 (also referred to as a rubber partition wall) 16 made of a rubber-like elastic material is provided in the second space 14 so as to connect the second space 14. Partitioned into a space 17 and an outer space 18, and a hole-shaped communication part 19 is provided in the second partition 11, and the inner space 17 and the third space 15 are communicated with each other by the communication part 19. As a result, the first space 13 becomes the first liquid chamber 20, the outer space 18 becomes the second liquid chamber 21, the inner space 17 and the third space 15 become the third liquid chamber 22, and the working liquid 23 is placed in each chamber. It is enclosed.
[0009]
The first partition 8 is provided with an idle orifice 24 through which the working fluid 23 flows when idle vibration is input, and the first liquid chamber 20 and the second liquid chamber 21 are communicated with each other by the idle orifice 24. The second partition 11 is provided with a shock orifice 25 through which the working fluid 23 flows when low-frequency large-amplitude vibration is input, and the second fluid chamber 21 and the third fluid chamber 22 communicate with each other through the shock orifice 25. It has been. A valve chamber 26 is provided in the inner peripheral portion of the first partitioning portion 8, and a plurality of communication holes 27 and 28 that communicate the valve chamber 26 with the first liquid chamber 20 or the third liquid chamber 22 are provided. A sub-diaphragm 29 made of a rubber-like elastic material having a disk shape that resonates and moves (finely vibrates) in the vertical direction in the figure when vibration with high frequency and small amplitude is input is inserted into the valve chamber 26. A lid 30 is attached to the other attachment portion 3 so as to cover and protect the diaphragm 6.
[0010]
The liquid-filled mount having the above-described configuration is attached to the vehicle body side of the vehicle with one of the one and other attachment portions 1 and 3 and attached to the engine side with the other. Absorbs and suppresses vibrations and high-frequency small-amplitude vibrations.
[0011]
That is, first, when idle vibration is input to the mount, the working fluid 23 flows through the idle orifice 24 that communicates the first liquid chamber 20 and the second liquid chamber 21. The hydraulic fluid 23 does not flow through the shock orifice 25. Accordingly, the dynamic spring constant can be set low by the expansion elasticity of the second liquid chamber 21 partitioned by the third partition 16 made of rubber-like elastic material and the resonance by the idle orifice 24, thereby making the idle vibration effective. Can be absorbed into. Further, when vibration with a low frequency and large amplitude is input to the mount, the working fluid 23 flows through the shock orifice 25 communicating with the second liquid chamber 21 and the third liquid chamber 22. Ru it is possible to obtain a damping by. Further, since the shock orifice 25 is arranged in such a positional relationship that the hydraulic fluid 23 can flow in series via the second liquid chamber 21 with respect to the idle orifice 24, the shock orifice 25 flows through the shock orifice 25. particular even flows hydraulic fluid 23 to the idle orifice 24 in fluid communication with the first fluid chamber 20 and the second liquid chamber 21 to replenish the second fluid chamber hydraulic fluid 23 of 21 flowing out into the third fluid chamber 22 It becomes, it is possible to obtain also the damping by the liquid column resonance of the idle orifice 24 by this. That is, high damping can be obtained by liquid column resonance by both the orifices of the shock orifice 25 and the idle orifice 24 , thereby effectively absorbing and suppressing vibration of low frequency and large amplitude. Further, when high-frequency small-amplitude vibration is input to the mount, the sub-diaphragm 29 resonates, so that it is possible to effectively absorb and suppress high-frequency small-amplitude vibration.
[0012]
The low frequency characteristics (FIG. 2), idle rotation region dynamic spring constant (FIG. 3), and high frequency dynamic spring constant (FIG. 4) of the mount are as shown in the respective graphs. It has a remarkable feature in the reduction of the dynamic spring constant. In each graph, the solid line indicates the mount, the dotted line indicates the liquid-filled mount according to the conventional technique, and the broken line indicates the rubber mount.
[0013]
【The invention's effect】
The present invention has the following effects.
[0014]
That is, in the liquid-filled mount of the present invention having the above-described configuration, when idle vibration is input to the mount, the working fluid flows through the idle orifice that communicates the first liquid chamber and the second liquid chamber. The dynamic spring constant with respect to vibration can be made lower than before. Therefore, it is possible to provide a mount product that has a low dynamic spring constant with respect to idle vibration and can effectively absorb and suppress idle vibration. In addition, when low-frequency, large-amplitude vibration is input, the hydraulic fluid flows not only to the shock orifice but also to the idle orifice. Therefore, the shock vibration is effectively absorbed and suppressed by the liquid column vibration generated by both the shock orifice and the idle orifice. For small amplitude vibrations, the sub-diaphragm can be activated to effectively absorb and suppress them.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a liquid-sealed mount according to an embodiment of the present invention. FIG. 2 is a graph showing low-frequency characteristics of the liquid-sealed mount. FIG. 4 is a graph showing the high-frequency dynamic spring constant of the liquid-sealed mount. FIG. 5 is a cross-sectional view of the liquid-sealed mount according to the conventional example.
DESCRIPTION OF SYMBOLS 1 One attachment part 2 Center boss 3 The other attachment part 4 Case 5 Elastic body 6 Diaphragm 6a Outer peripheral edge part 7 Airtight space 8 First partition part 9 First orifice plate 10 Second orifice plate 11 Second partition part 12 Third Orifice plate 13 First space 14 Second space 15 Third space 16 Third partition 17 Inner peripheral space 18 Outer peripheral space 19 Communication portion 20 First liquid chamber 21 Second liquid chamber 22 Third liquid chamber 23 Working fluid 24 Idle orifice 25 Shock orifice 26 Valve chamber 27, 28 Communication hole 29 Sub-diaphragm 30 Lid

Claims (1)

One attachment portion (1) and the other attachment portion (3) are connected via an elastic body (5) made of rubber-like elastic material, and a diaphragm (6) is connected to the other attachment portion (3). An airtight space (7) is provided, and the first and second partition portions (8) and (11) are provided in the airtight space (7) so that the airtight space (7) is the first space on the one attachment portion (1) side. (13) is partitioned into a second space (14) between the partitions (8) and (11) and a third space (15) on the diaphragm (6) side, and the second space (14) is rubbery. A third partition (16) made of an elastic material is provided to partition the second space (14) into an inner circumferential space (17) and an outer circumferential space (18), and the first space (13) is first. A liquid chamber (20), the outer peripheral space (18) as a second liquid chamber (21), the second partition (11) and the inner peripheral space (17) and the front A communication portion (19) that communicates with the third space (15) is provided, and the inner peripheral space (17) and the third space (15) serve as a third liquid chamber (22), and the first liquid chamber ( 20) and the second liquid chamber (21) are communicated with each other via an idle orifice (24) through which hydraulic fluid (23) flows when idle vibration is input, and the second liquid chamber (21) and the third liquid chamber (21) are communicated. A fluid chamber (22) is communicated with a shock orifice (25), and the shock orifice (25) is connected to the idle orifice (24) via the second fluid chamber (21). Are arranged in a positional relationship so that the liquid can flow in series, and a sub-diaphragm (29) is provided between the first liquid chamber (20) and the third liquid chamber (22). Enclosed mount.

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