JPH04165137A - Liquid-in-vibration proofing device - Google Patents

Abstract

PURPOSE:To avoid increase in size and weight of a device, secure a sufficient valve member stroke, and keep the valve member in a stabilized condition resisting against the pressure of sealed fluid by providing a pressure chamber for drive moving the valve member, an electromagnetic coil for tight contact attraction, and control means for timely controlling those components. CONSTITUTION:The inside of the side wall 81 of a vibration proof rubber body 1 is divided with a partition wall 3 into an upper main fluid chamber A and a lower sub-fluid chamber B. In the center of the partition wall 3 is formed a space connecting downward through an opening 3a. The fore-end valve body 41 of a valve member 4 is located through the opening 3a in said space. A diaphragm 81 is located between the outer circumference of the valve member 4 and the inner circumference of a side wall 81 to divide said space into upper and lower sections, and forms a pressure chamber D between a bottom plate 85. A coil spring 5 is placed in the pressure chamber D to energize the valve member 4 to the top end position as shown. An electromagnetic coil 6 is provided on the bottom plate 85 of the pressure chamber D to be electrified with specified timings through a control circuit 7. This provides optimum vibration proof effect commensurate with input vibration without increasing size and weight of the device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid-filled vibration isolator, and more particularly to a liquid-filled vibration isolator that exhibits suitable vibration damping performance by changing device characteristics in response to vibration input. .

[Prior Art] A liquid-filled vibration isolator has a vibration isolating rubber body that supports a vibrating body, which is divided by a partition wall to form a pair of liquid chambers, and these liquid chambers are communicated through a throttle channel provided in the partition wall. At the very least, effective vibration damping is achieved through the action of the sealing fluid flowing through the throttle channel.

In such a liquid-filled vibration damping device, attempts have been made to obtain optimal vibration damping performance by changing the cross-sectional area and channel length of the throttle channel in response to various vibration inputs.

[Problems to be Solved by the Invention] By the way, in conventional liquid-filled vibration isolators, valve members that change the flow path cross-sectional area are actuated by pressure fluid (Japanese Patent Application Laid-open No. 127537/1983), or electromagnetic There is a valve operated by a coil (Japanese Utility Model Application Publication No. 61-116251), but the pressure fluid type allows a large operating stroke, but the force to hold the valve member in a predetermined position against the pressure of the sealed liquid is weak. On the other hand, those using electromagnetic coils have a large holding force, but cannot ensure a sufficient operating stroke. In order to eliminate such drawbacks (1) by increasing the pressure receiving surface of the pressure chamber or increasing the attraction force of the electromagnetic coil, it is inevitable to increase the size and weight of the device.

The present invention solves these problems, and is capable of ensuring sufficient valve member space and loaf without significantly increasing the size and weight of the device. It is an object of the present invention to provide a liquid-filled vibration isolator that can stably maintain vibration.

[Means for Solving the Problems] To explain the present invention in detail, a pair of liquid chambers A and B are defined by a partition wall 3 having a throttle channel in a vibration isolating rubber body 1 that supports a vibrating body. , a valve member 4 that operates in one direction or the other direction without changing the flow path length or flow path cross-sectional area of the throttle flow path, and a spring member 5 that biases the valve member 4 to move in the above-mentioned - direction. Then, the pressure fluid is supplied to the spring member 5.
a pressure chamber for driving the valve member 4 to move in the other direction against the spring force of the magnet; ,1
The electromagnetic coil 6 is energized after a predetermined period of time has elapsed after the pressure fluid is supplied to the pressure chamber (2), and a control means 7 is provided for energizing the electromagnetic coil (2) and then stopping the supply of pressure fluid.

[Function] In the liquid-filled vibration isolator having the above configuration, the control means 7 first supplies pressure fluid to the pressure chamber to move the valve member 4 into the spring member 5.
It is driven to move in the other direction J\ against the spring force of. When a predetermined period of time has elapsed and the valve member 4 approaches the electromagnetic coil 6 sufficiently, the control means 7 energizes the electromagnetic coil 6 to turn it on.
The valve marking member 4 is brought into close contact with suction.

Thus, the valve part 11'4 is supplied to the pressure chamber and moved through a long stroke by the pressure fluid, and is then brought into close contact with the electromagnetic coil 6 to resist the pressure of the sealing fluid. It is firmly held.

According to this configuration, there is no need to make the pressure receiving area of the pressure chamber larger than necessary, and there is no need to make the electromagnetic coil 6 larger than necessary, so an increase in weight and size of the device can be avoided. .

[Example] In Fig. 1, the vibration isolating rubber body] is shaped like a thick container that opens downward, and the upper end of a cylindrical side plate 81 is joined to the periphery of the opening, and the flat top of the rubber body is shaped like a thick container that opens downward. 1 plate 8 on the surface
2 are joined and the engine is mounted. Side plate 81. I
The J old is divided into upper and lower parts by a partition wall 3, and the upper sealed space is a main liquid chamber A whose chamber walls are the vibration isolating rubber pads 1.

-1- The partition wall 3 consists of a main plate 31 and a cover plate 32 provided on two sides of the main plate 31. The outer periphery of is closely fixed to the inner periphery of the side plate 81. A space communicating downward is formed in the center of the partition wall 3 through an opening 3a, and a tip valve body 41- of the rod-shaped valve member 4 is inserted into the space through the opening 3a.
is located. The valve body 4 expands in diameter upward to form a tapered lower surface, opens the opening 3a at one end position shown in the figure, and moves downward to maintain the same tapered shape and close the periphery of the opening 3a. Close this closely.

The center part of the thin rubber membrane 2 is joined to the outer periphery of the middle part of the valve part H4, and the outer periphery of the rubber membrane 2 is sandwiched between the spacer plate 83 (which is in contact with the inner periphery of the side plate 81) and the lower outer periphery of the main plate 31. A sub-liquid chamber B is formed below the partition wall 3, with the membrane 2 serving as a chamber wall.

An upstream throttle channel 33 is formed on the outer periphery of the partition wall 3, with one end communicating with the main liquid chamber A and the other end reaching the space, and the inner periphery is connected to the main liquid chamber A. A downstream throttle flow path 34 is formed which emits the fluid and opens into the sub-liquid chamber B.

A diaphragm membrane 84 is disposed between the outer periphery of the upper end of the valve member 4 and the inner periphery of the side plate 81 to partition a space vertically, and forms an atmospheric chamber C between the diaphragm membrane 84 and the rubber membrane 2. , and a bottom plate 85 that closes the lower opening of the side plates 8]- to form a pressure chamber. The atmospheric chamber C communicates with the atmosphere through a through hole 83 passing through the spacer plate 83 and the side plate 81.

A negative pressure supply pipe 71 is connected to the pressure chamber through a pipe joint 86, and the negative pressure supply pipe 71 is selectively communicated with a negative pressure source 73 and the atmosphere by an electromagnetic switching valve 72 provided in the middle.

The electromagnetic switching valve 72 is energized and operated by a control circuit 7 outside the device.

Inside the pressure chamber, a coil spring 5 is disposed between a plate 87 and a bottom plate 85 of a metal spring holder which is provided at the lower end of the valve member 4 and which holds the diaphragm membrane 84 between them. The spring force of the coil spring 5 urges the valve member 4 to move to the upper end position shown in the figure. Further, an electromagnetic coil 6 is provided on the bottom plate 85 in the pressure chamber so that the spring receiver faces the plate 87, and the electromagnetic coil 6 is energized by the control circuit 7 at a timing to be described later.

The operation of the control law B7 when the valve member 4 is closed will be explained with reference to FIG. When the electromagnetic switching valve 72 is energized from the control circuit 7 (broken line in the figure) and activated, a negative pressure source is connected to the pressure chamber, and the supplied negative pressure causes the valve member 4 to move against the coil spring 5. It is moved downward against the spring force.

After 0.5 seconds have elapsed, the electromagnetic coil 6 is energized (solid line in the figure), and at this time, the spring receiver, which is moving together with the valve member 4, is moved by the strong magnetic field of the electromagnetic coil 6. Since they are close enough to each other, when the magnetic field of the electromagnetic coil 6 acts, they are quickly and firmly attracted and brought into close contact with the electromagnetic coil 6. As a result, the valve body 41 is firmly attached to the periphery of the opening 3a, and will not be opened even if a large negative pressure generated in the main liquid chamber A is applied.

After this (after 0.75 seconds in the embodiment), the energization to the electromagnetic switching valve 6 is removed and the pressure chamber is returned to the atmosphere, but the plate 87 of the spring receiver is strongly attracted to the electromagnetic coil 6. As a result, the valve member 4 is held in the closed position. Furthermore, ]1
When the second elapses, the amount of current applied to the electromagnetic coil 6 is reduced to prevent it from generating heat. When the spring receiver attracts the plate 87, the electromagnetic coil 6 exerts sufficient attraction force even if the amount of current is reduced.

In this way, the compact pressure chamber allows the valve member 4 to move with a long stroke, and the magnetic field of the compact electromagnetic coil 6 is applied to the valve member 4 that is sufficiently close to the valve member 4 to tightly contact it, thereby ensuring reliable valve closing. state can be maintained, and the upstream and downstream throttle channels 33.34
A series of long constricted channels reduce the attenuation of low-frequency, large-amplitude vibrations.

When opening the valve body 41, the electromagnetic coil 6
Stop energizing. As a result, the valve member 4 is moved upward by the spring force of the coil spring 5 to open the opening 3a. As a result, the throttle flow path length is substantially shortened only on the upstream side, and the attenuation of large-amplitude vibrations on the higher frequency side is reduced.

In addition, in the above embodiment, the electromagnetic coil can also be provided on the valve member side.

It goes without saying that the present invention can also be applied to driving a valve member that changes the cross-sectional area of the throttle channel instead of changing its length.

[Effects of the Invention] As described above, according to the device of the present invention, by combining a relatively compact pressure chamber and an electromagnetic coil, the characteristics of the device can be quickly and easily changed through reliable valve operation without increasing the size of the device. It is possible to reliably change the vibration damping effect to achieve the optimum vibration damping effect according to the input vibration.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of a device showing an embodiment of the present invention, and FIG. 2 is a time chart showing the operation of a control circuit. DESCRIPTION OF SYMBOLS 1... Vibration-proof rubber body 2... Rubber membrane 3... Partition wall 4... Valve member 5... Coil spring (spring member) 6... Electromagnetic coil 7... Control circuit (control means ) A...Main liquid chamber B...Sub-liquid chamber C...Atmospheric chamber D...Pressure chamber

Claims (1)

[Claims] A pair of liquid chambers partitioned by a partition wall having a throttle channel in a vibration isolating rubber body that supports the vibrating body, and a liquid chamber in one direction or the other direction for changing the length or cross-sectional area of the throttle channel. a spring member that biases the valve member to move in the one direction; and a pressure fluid that is supplied with pressure fluid and drives the valve member to move in the other direction against the spring force of the spring member. a chamber, an electromagnetic coil that closely attracts the valve member that has come close to it by moving in the other direction, and after supplying pressure fluid to the pressure chamber, the electromagnetic coil is energized after a predetermined period of time has elapsed, and then the pressure fluid is supplied to the electromagnetic coil. A liquid-filled vibration isolator comprising a control means for stopping the supply of the liquid.