JP2010255819A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device for effectively developing vibration damping functions based on the liquid column resonance of a filled liquid and others against idling vibration and engine shaking vibration without a risk of the entry of foreign matters. <P>SOLUTION: The outer peripheral face of a core member 1 and the inner peripheral face of a cylindrical member 2 at one end are connected to each other all over via an elastic member 3 with liquid tightness, and the inner peripheral face of the cylindrical member 2 at the other end is sealed with liquid tightness by one or more diaphragms 4 arranged in parallel. A main liquid chamber 7 located at the side of the elastic member is partitioned from a first sub liquid chamber 8 and a second sub liquid chamber 9 located at sides of the diaphragms, and a first restricting passage 10 and a second restricting passage 11 are made to independently communicate with each other. A first air chamber 14 and a second air chamber 15 are provided, a communication path is formed for making the first air chamber 14 and the second air chamber 15 communicated with each other, and a solenoid valve 16 is provided for serving to open and close the communication path. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vibration isolator capable of exhibiting a vibration damping function based on the flow of an incompressible liquid enclosed therein. For example, the present invention is applied as an engine mount, and idle vibration and engine shake vibration. The technique of the vibration isolator which attenuate | damps and isolates each etc. effectively is proposed.

  In general, an engine mount as an anti-vibration device is disposed between an engine serving as a vibration generation unit of an automobile and a vehicle body serving as a vibration input unit. The engine mount is generated by, for example, an engine. Absorbs vibration, for example, shake vibration of low frequency large amplitude vibration of 5 to 20 Hz and idle vibration of medium to medium amplitude vibration of 20 to 40 Hz, and functions to prevent transmission of these vibrations to the vehicle body side. .

  With respect to the vibration isolator used as such an engine mount, as shown in FIG. 3 in a longitudinal sectional view including a central axis, Patent Document 1 discloses a vibration generating side member, for example, a core member 53 connected to an engine. And an inner peripheral surface of a cylindrical member 52 connected to a vibration transmission side member, for example, a vehicle body, are liquid-tightly connected by an elastic member such as rubber, and the opening end of the cylindrical member is connected to the diaphragm 54. The space surrounded by the diaphragm 54, the elastic member, and the cylindrical member, more precisely, the elastic member lining portion to the cylindrical member, is sealed with an incompressible liquid. The fluid chamber is divided into a main liquid chamber located on the elastic member side and two sub liquid chambers 58 and 59 located on the diaphragm side by a partition member, and both the liquid chambers are separated. The idol shake In addition, the restriction passages 60 and 61 exhibiting a vibration damping function with respect to the shake vibration are communicated independently of each other and located outside the diaphragm 54 of the sub liquid chamber 58 on the side of absorbing the shake vibration. An air chamber 64 having a switching valve 66 for opening and closing the communication path with the atmosphere is disclosed.

  This liquid-filled vibration isolator is applied to an engine mount in a state where the core member 53 is connected to the engine and the cylindrical member 52 is connected to the vehicle body. Alternatively, in response to the input of shake vibration, the air in the air chamber 64 works as an air spring by opening and closing the switching valve 66, and vibrations having different frequencies can be absorbed by changing the spring rigidity of the diaphragm.

  However, in the above disclosed technique, the switching valve 66 constituted by an electromagnetic valve or the like is opened to the atmosphere, so that dust or dirt existing in the outside air enters the valve, and the switching valve 66 air Therefore, it is necessary to attach a filter or the like to the intake / exhaust port 70 to the atmosphere side of the switching valve 66 to prevent intrusion of dust and dirt, and if the filter is clogged, the passage of air There was a risk that the resistance would increase and the air flow would deteriorate, and the vibration could not be reduced sufficiently.

Japanese Patent No. 2778710

  The present invention is capable of effectively exhibiting a vibration damping function based on liquid column resonance or the like of an enclosed liquid against any of idling vibration, engine shake vibration, and the like, without fear of intrusion of foreign matter or the like. It is to provide a vibration device.

  An anti-vibration device according to the present invention includes a core member connected to one side of a vibration generation side member or a vibration transmission side member and a cylindrical member connected to the other side, and an outer peripheral surface of the core member And one end portion inner peripheral surface of the cylindrical member are liquid-tightly connected over the entire circumference by an elastic member, and the other end portion inner peripheral surface of the cylindrical member is arranged in parallel with one or more sheets Liquid tightly sealed with a diaphragm, and at least a space surrounded by the diaphragm, the cylindrical member, and the elastic member is a fluid chamber filled with liquid, and the fluid chamber has a partition member on the elastic member side. A main liquid chamber positioned and a sub liquid chamber on the diaphragm side, and the sub liquid chamber is divided into a first sub liquid chamber and a second sub liquid chamber; The first restriction that causes the secondary liquid chamber to damp vibrations And the main liquid chamber and the second sub liquid chamber are connected to each other independently of each other in each of the second restriction passages that provide vibration damping different from that of the first restriction passage, and the first of the diaphragm The first air chamber is provided on the side opposite to the sub liquid chamber side, and the second air chamber is provided on the side opposite to the second sub liquid chamber side of the diaphragm. A communication path for communicating the air chamber and the second air chamber is provided, and an electromagnetic valve for opening and closing the communication path is provided.

  More preferably in such a vibration isolator, the first restricting passage provides damping of idling vibration and the second restricting passage provides damping of engine shake vibration.

  Preferably, the solenoid valve is a negative pressure generating valve, and is provided with an intake port in one air chamber and an exhaust port in the other air chamber.

  In the vibration isolator of the present invention, it is applied as an engine mount. For example, in a state where the core member is connected to the engine side member and the cylindrical member is connected to the vehicle body side member, For the input of engine shake vibration of 5 to 20 Hz (low frequency large amplitude (0.5 to 1 mm) vibration), the liquid in the main liquid chamber and the first sub liquid chamber should have sufficient volume. Engine shake vibration based on the liquid column resonance, flow resistance, etc. of the liquid in the passage at the tuning frequency of the first restricted passage by flowing under free deformation of the diaphragm through the first restricted passage Can be effectively attenuated.

  On the other hand, in response to an input of idling vibration (vibration having a medium frequency (20 to 40 Hz) and medium amplitude (0.05 to 0.2 mm)) when the vehicle is stopped, the main liquid chamber and the second sub liquid chamber are used. Of each of the liquids through the second restricted passage with sufficient volume under the free deformation of the diaphragm, and smoothly flowing between the two liquid chambers, at the tuning frequency of the second restricted passage. The idling vibration can be effectively damped based on the liquid column resonance, flow resistance, and the like of the liquid in the passage.

  In this vibration isolator, the electromagnetic valve is switched between the state in which the communication path between the first air chamber and the second air chamber is opened and the state in which the communication path is blocked by the electromagnetic valve. The filter is not necessary and the pressure can be adjusted between the two secondary liquid chambers without opening them to the atmosphere. it can.

It is a longitudinal section showing a central axis showing one embodiment of this invention. It is a longitudinal cross-sectional view similar to FIG. 1 which shows other embodiment. It is the same longitudinal cross-sectional view as FIG. 1 which shows a prior art.

  In the vibration isolator of the present invention, as shown in FIG. 1, a core member 1 connected to one side of an engine or other vibration generating side member or a vibration transmitting side member of an automobile body or the like, and connected to the other side Each of the cylindrical members 2 is provided and has an outer peripheral surface of the core member 1 and an inner peripheral surface of one end portion of the cylindrical member 2, and in the figure, an inverted truncated cone shape or an inverted truncated pyramid shape. The inner peripheral surface is liquid-tightly connected to the entire circumference by an elastic member 3 made of rubber, elastomer, plastic or the like, and the other end of the cylindrical member 2 is liquid-tightly sealed by a diaphragm (in the figure, one diaphragm 4). Stop.

  In the figure, the elastic member 3 is used to line up to the lower end edge of the equal-diameter portion of the cylindrical member 2, but this lining by the elastic member 3 is not essential.

Here, at least a space surrounded by the diaphragm 4 and the cylindrical member 2 including the lining of the elastic member 3 and the elastic member 3, and sometimes the core member 1 exposed from the elastic member 3 in addition to them. The enclosed space is a fluid chamber in which a required incompressible liquid such as ethylene glycol is enclosed, and this fluid chamber is separated by a partition member 6 into a main liquid chamber 7 located on the elastic member side, and a diaphragm. The sub liquid chamber is partitioned into a sub liquid chamber located on the side, and the first sub liquid chamber 8 and the second second sub liquid chamber 9 are partitioned in parallel.
The main liquid chamber 7 and the first sub-liquid chamber 8 are provided in the partition member 6 in the figure, and the first restriction passage 10 that attenuates engine shake vibration and the main liquid chamber 7 and the second sub-liquid chamber are provided. The chambers 9 are made to communicate with each other independently of each other in the second restricting passages 11 that cause the damping of the idle vibration and are usually larger in cross-sectional area and shorter in length than the restricting passages 10.

A membrane 12 made of an elastic member is disposed at the upper end of the partition member 6 and between the main liquid chamber 7 and the first sub liquid chamber 8.
Although not shown in the figure, the partition member 6 has a predetermined communication hole in the shape of a disk, for example, and is provided with a restricting member that restricts the movement of the membrane 12. By this communication hole, the liquid chamber and the membrane 12 are separated. The liquid in the liquid chamber communicates with each other.

  The other end of the cylindrical member 2 is sealed with a housing 13, and a first air chamber 14 is provided between the housing 13 and the diaphragm 4 on the opposite side of the first sub liquid chamber 8. A second air chamber 15 having a volume smaller than that of the first air chamber 14 is partitioned between the housing 13 and the diaphragm 4 on the opposite side of the second sub liquid chamber 9.

  Here, the vibration frequency to be absorbed is determined by the size of the restriction passage, the rigidity of the diaphragm, the size of the air chamber, and the like, and the second restriction passage 11 absorbs vibration at a higher frequency than the first restriction passage 10. can do.

  In such a vibration isolator, mainly under the shake vibration of the automobile engine, the liquid in the main and sub liquid chambers flows from the high pressure side to the low pressure side through the first restricting passage 10. As a result, effective damping of the shake vibration is performed based on the occurrence of flow resistance, liquid column resonance at a predetermined frequency, etc. in the first restricted passage having a predetermined volume. become. Since the second restriction passage 11 is in a clogged state during the shake vibration, the liquid in the liquid chambers is prevented from flowing through the restriction passage 11.

  On the other hand, under the idle vibration of the automobile engine, the liquid in the main and sub liquid chambers flows from the high pressure side to the low pressure side through the restriction passage, and as a result, the first volume having a predetermined volume. Effective damping of idle vibration is performed based on the occurrence of flow resistance, liquid column resonance at a predetermined frequency, and the like in the second restriction passage 11. Since the first restriction passage 10 is in a clogged state during the idling vibration, the liquid in both liquid chambers is prevented from flowing through the restriction passage 10.

  On the other hand, when the high-frequency vibration is input and the two restriction passages 10 and 11 are clogged, and the flow of the sealed liquid becomes impossible, the membrane 12 is under elastic deformation, for example. By virtue of the vibration, the abnormal pressure increase in the liquid chamber can be prevented, the vibration isolation function based on the deformation of the rubber elastic body 3 can still be exhibited, and the dynamic spring constant can be kept sufficiently low.

  The vibration isolator includes an electromagnetic valve 16 that can be switched between a state in which the first air chamber 14 and the second air chamber 15 are communicated with each other and a state in which the air chamber 15 is closed.

  Here, in the solenoid valve 16, for example, a coil housing body containing a coil is connected via a tube, and a spring is disposed between the proximal end side of the plunger and the attractor installed in the coil housing body. The plunger is movably disposed in the tube. When a predetermined voltage is applied to the coil of the solenoid valve 16, the plunger is attracted to the attractor side by the electromagnetic force generated by the coil, the packing at the tip of the plunger escapes and the opening is opened.

In such a vibration isolator, preferably, the electromagnetic valve 16 can be a negative pressure generating valve,
The intake port 17 that is one open end of the electromagnetic valve 16 is connected to the second air chamber 15 in the drawing via a pipe, and the first air chamber is connected to the exhaust port 18 that is the other open end via the pipe. 14, the gas in the second air chamber can be sucked and exhausted into the first air chamber.

  According to this configuration, when the solenoid valve 16 is in the shut-off state, the movement of the diaphragm 4 that partitions the main liquid chamber 7 and each sub liquid chamber is not suppressed, so that the effect of liquid resonance in the restriction passage is maintained. In addition, the dynamic spring coefficient can be reliably reduced during idle vibration, and vibration can be sufficiently reduced, and vibration can be sufficiently reduced even during shake vibration.

  On the other hand, when the electromagnetic valve 16 is in the open state, the diaphragm 4 provided in the second sub liquid chamber 9 is greatly deformed. The gas in the chamber 15 can be exhausted to the first air chamber 14 having a large volume via the communication path, and the gas flows from the second air chamber 15 to the first air chamber 14. The liquid in the restriction passage 11 is clogged and liquid column resonance, viscous resistance, and the like are not reduced, and idle vibration can be absorbed without particularly reducing absorption of shake vibration.

FIG. 2 is a longitudinal sectional view including a central axis showing another embodiment of the present invention.
This vibration isolator has a structure in which the entire electromagnetic valve 26 is enclosed in the sealing member of the vibration isolator, and the electromagnetic valve 26 itself can be completely shut off from outside air, and the entire vibration isolator can be downsized.

DESCRIPTION OF SYMBOLS 1 Core member 2,52 Cylindrical member 3,53 Elastic member 4,54 Diaphragm 6 Partition member 7,57 Main liquid chamber 8,58 First subliquid chamber 9,59 Second subliquid chamber 10,60 First Restricted passage 11, 61 Second restricted passage 13 Housing 14, 64 First air chamber 15 Second air chamber 16 Solenoid valve 17 Intake port 18 Exhaust port 66 Switching valve 70 Intake / exhaust port

Claims (3)

A core member connected to either one of the vibration generation side member or the vibration transmission side member and a cylindrical member connected to the other side are provided, and the outer peripheral surface of the core member and one end of the cylindrical member are provided. The partial inner peripheral surface is liquid-tightly connected over the entire circumference by an elastic member, and the other end partial inner peripheral surface of the cylindrical member is liquid-tightly sealed by one or more diaphragms arranged in parallel.
At least a space surrounded by the diaphragm, the tubular member, and the elastic member is a fluid chamber in which a liquid is sealed, and the fluid chamber has a partition member and a main liquid chamber located on the elastic member side, and the diaphragm The auxiliary liquid chamber is divided into a sub liquid chamber on the side, and the sub liquid chamber is divided into a first sub liquid chamber and a second sub liquid chamber, and the main liquid chamber and the first sub liquid chamber are damped in vibration. The first restriction passage and the main liquid chamber and the second sub-liquid chamber are respectively connected to each other independently of each other in the second restriction passages that cause vibration damping different from the first restriction passage, In a vibration isolator comprising a first air chamber on the side opposite to the first sub liquid chamber side of the diaphragm and a second air chamber on the side opposite to the second sub liquid chamber side of the diaphragm ,
An anti-vibration device comprising a communication path that allows the first air chamber and the second air chamber to communicate with each other, and an electromagnetic valve that opens and closes the communication path.   The anti-vibration device according to claim 1, wherein the first restriction passage provides idling vibration attenuation, and the second restriction passage provides engine shake vibration attenuation.   The vibration isolator according to claim 1 or 2, wherein the electromagnetic valve is a negative pressure generating valve, and an intake port is provided in one air chamber and an exhaust port is provided in the other air chamber.

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