JP3547494B2 - Movable valve type fluid filled anti-vibration support device - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable valve type fluid-filled anti-vibration support device suitable for use in an engine mount, a roll insulator, or the like provided for the purpose of preventing engine vibration in an automobile from being transmitted to a vehicle body.
[0002]
[Prior art]
The vibrations of the engine in a vehicle include a low-frequency vibration of 15 Hz or less when the vehicle is running at a high speed and a low-frequency vibration of about 20 to 40 Hz during idling. . Therefore, if the flow resistance or the liquid column resonance of the fluid flowing between the fluid chambers is tuned to the frequency of one of the vibrations, the other vibration cannot be sufficiently absorbed.
[0003]
For example, if the liquid column resonance is tuned so as to obtain a high damping effect by the fluid flowing between the fluid chambers during shake vibration, the flow resistance becomes higher when idle vibration of a higher frequency is input. As a result, the dynamic spring is increased, and the vibration-proof performance against idle vibration is extremely reduced.
[0004]
For this reason, JP-A-60-113825 and JP-A-60-045130 disclose a short-circuit through hole formed in a partition plate for partitioning a fluid chamber in addition to an orifice passage communicating between fluid chambers. Here, a configuration in which a movable valve is mounted is shown. As a result, when a large amplitude shake vibration occurs, the movable valve closes the through hole, and the fluid is caused to flow through the orifice passage to attenuate the vibration. Conversely, when the small amplitude idle vibration occurs, the movable valve is blocked. Then, the fluid is allowed to freely flow through the through-hole, and the vibration is absorbed by suppressing the rise in the dynamic spring constant.
[0005]
[Problems to be solved by the invention]
However, the prior art described above has the following disadvantages. That is, in each of the prior examples, in the free state, the movable valve is in contact with the partition plate having the through hole, and is in a state of closing the through hole. Therefore, when a twist or a twist occurs, a malfunction may occur. It is also expected that the fluid will not move smoothly if it moves irregularly. In particular, in the case of an engine mount or the like of an FR vehicle, the vibration isolator itself is attached at an angle, so that there is a further concern about malfunction.
The present invention has been made to solve such a problem, and is intended to reliably operate a movable valve without being affected by a vibration input or a mounting posture.
[0006]
[Means for Solving the Problems]
In view of the above objects, the present invention provides two fluid chambers separated by a partition plate in a rubber elastic case to which vibration is input and communicated by an orifice passage formed of a circular space formed on the outer periphery of the partition plate. In a fluid-filled anti-vibration support device vertically separated, a through-hole is formed in a partition plate, and a trunk is inserted into the through-hole with a gap with respect to the through-hole , and a partition is formed above and below the trunk. A movable valve is provided, which comprises a contact plate having a diameter larger than that of a through-hole that is continuously spaced apart from the plate and moves in accordance with the magnitude of the amplitude to close and unblock the through-hole. Is a rubber elastic material suspension band in which the spring constant can be set arbitrarily, by bridging a rubber plate between the contact plate and the orifice passage, leaving the middle radially, and cutting off the surplus part as a fluid passage. And pulled from the surroundings to keep it in the unobstructed position. It is obtained by providing a valve fluid filled vibration isolating support device.
[0007]
[Action]
By taking the above measures, that is, the movable valve is forcibly held at the position where the through hole is not closed (hereinafter referred to as a neutral position) when the amplitude of the vibration is equal to or less than a certain value, and the magnitude of the amplitude is small. Is reliable, and a highly reliable anti-vibration function can be obtained. This is true even when the elastic case is attached at an angle, so there is no restriction on the mounting position. In this case, when the spring constant (resistance) of the suspension band is changed, the moving amount of the movable valve naturally changes, so that the relationship between the amplitude and the blocking or non-blocking of the through hole can be tuned to a desired value.
[0008]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a fluid-filled anti-vibration support device for an engine mount, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 1. The interior of an elastic case 14 having a structure in which a space is provided in the upper part and the rubber elastic material 12 is covered by vulcanization bonding is vertically divided by a metal partition plate 16, and a fluid is sealed in each space. Rooms 18 and 20 are provided.
[0009]
In this case, a metal auxiliary plate 22 is also stretched above the partition plate 16, a circular space is formed between the partition plate 16 and the auxiliary plate 22, and this is used as the orifice passage 24 (26, 26). 28 is a communication hole communicating with each of the fluid chambers 18 and 20), and the fluids in the two fluid chambers 18 and 20 can move with each other. Further, the bottom surface of the lower fluid chamber 20 is formed by the diaphragm 30, and the space between the cup 10 and the diaphragm 30 is set to the atmospheric pressure. As a result, the upper fluid chamber 18 is formed as a pressure receiving chamber, and the lower fluid chamber 20 is formed as a balance chamber.
[0010]
A through hole 32 is formed in the center of the partition plate 16, and a movable valve 34 is attached to the through hole 32. The movable valve 34 is held at a position where the through-hole 32 is not closed by being pulled from the periphery by a suspension band 36 made of a rubber elastic material. Thereby, although the movable valve 34 moves in response to the input of the vibration, when the amplitude thereof is equal to or less than a predetermined value, the through-hole 32 remains unblocked by the action of the suspension band 36, and the vibration having the amplitude exceeding this is input. Then, the through hole 32 is closed only when it is pressed.
[0011]
By the way, in this case, if the spring constant of the suspension band 36 is changed, the movable valve 34 closes or does not close the through hole 32 even with the vibration having the same amplitude. Thus, the spring constant is a tuning factor, and in this regard, the present invention is an extension of the tuning factor.
[0012]
The movable valve 34 in the present example is connected to a body 38 that is inserted with a gap through the through-hole 32, and is continuously provided above and below the body 38 at a fixed distance from the partition plate 16. It comprises large contact plates 40 and 42. More specifically, the body 38 and the lower contact plate 42 are formed as a resin integral body, and the upper contact plate 40 made of a metal plate is fitted into the body 38 and caulked.
[0013]
In this case, the outer peripheral end is provided between the partition plate 16 and the auxiliary plate 22, and the rubber plate 44 also serving as a seal member for the orifice passage 24 is extended to between the upper contact plate 40 and the body 38. About four radial bridge portions (between the abutment plate 40 and the end portion) are left in the middle to form the suspension band 36, and the remaining portion is cut out to form a fluid passage. As a result, the movable valve 34 is held at a fixed position (neutral position) in which the upper and lower, left and right sides are balanced by the pulling force of the suspension band 36. If the width or thickness of the suspension band 36 is changed at this time, the spring constant is also changed.
[0014]
As described above, when no vibration is input, the movable valve 34 is held at a position where the two contact plates 40 and 42 are separated from the partition plate 16, that is, at a neutral position by the action of the suspension band 36. The same applies to the case where the amplitude does not reach the distance between the contact plates 40 and 42 and the partition plate 16 even if it is input. Therefore, the fluid in the fluid chambers 18 and 20 can freely flow through the gap between the body 38 of the movable valve 34 and the through hole 32, and does not increase the dynamic spring constant. As a result, it is effective in absorbing idle vibration. In this case, if the through-hole 32 is tuned so as to be the second orifice passage 24, it is effective in absorbing the muffled sound of high-frequency vibration of about 100 Hz.
[0015]
On the other hand, when a vibration having a large amplitude is input and the movable valve 34 attempts to ascend or descend more than the distance to the partition plate 16, the two contact plates 40 and 42 contact the partition plate 16 to form the through holes 32. Because of the blockage, the fluid actively flows through the orifice passage 24 to exhibit a damping effect. As a result, it is effective in damping the shake vibration. In this way, it absorbs and attenuates all vibrations having different frequencies such as idle vibration, shake vibration, and muffled sound.
[0016]
FIG. 3 is a cross-sectional view of a main part of a fluid-filled anti-vibration support device showing another embodiment of the present invention. In this embodiment, the inner peripheral end of the rubber plate 44 and the upper contact plate 40 are connected to each other. Butts are directly vulcanized and bonded (the rubber plate 44 is not extended below the contact plate 40). The thickness of the contact plate 40 can be increased, and a damper effect can be expected.
[0017]
FIG. 4 is also a cross-sectional view of a main part of a fluid-filled anti-vibration support device showing another embodiment of the present invention. In this embodiment, the body 38 of the movable valve 34 is eliminated and separate contact plates 40, 42 are placed above and below the through hole 32. There is an advantage that the components can be shared, and processing such as caulking becomes unnecessary, and the cost can be reduced.
[0018]
【The invention's effect】
As described above, since the present invention balances the movable valve at the neutral position with the suspension band of the rubber elastic material, the movable valve type fluid-filled anti-vibration support device of this type that can absorb and attenuate vibrations in a wide frequency range. Ensuring a reliable movement of the movable valve, a basic element. Therefore, a highly reliable anti-vibration support device can be realized. Further, by changing the spring constant of the suspension band, it is possible to tune the amplitude at which the through hole is closed or not closed.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a movable valve type liquid-filled anti-vibration support device showing an embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a longitudinal sectional view of a main part of a movable valve type liquid-filled anti-vibration support device according to another embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of a main part of a movable valve type liquid-filled anti-vibration support device showing another embodiment of the present invention.
[Explanation of symbols]
14 Elastic case 16 Partition plate 18 Fluid chamber 20 Fluid chamber 24 Orifice passage 32 Through hole 34 Movable valve 36 Suspension belt 38 Body 40 Contact plate 42 Contact plate

Claims (1)

A fluid-filled anti-vibration support in which two fluid chambers separated by a partition plate in a rubber elastic case to which vibration is input and communicated by an orifice passage formed of a circular space formed on the outer periphery of the partition plate are vertically separated. In the device, a through-hole is formed in the partition plate, and a through-hole is inserted into the through-hole with a gap secured between the through-hole, and a partition plate is provided continuously above and below the torso with a certain distance therebetween. that consists of a large-diameter contact plate than the through hole, closing the through hole by the movement corresponding to the amplitude of the magnitude, fitted with a movable valve that unobstructed, the movable valve, the abutment plate and the orifice passage A rubber plate is bridged in between, leaving the middle radially and cutting the remaining part to make a fluid passage. A movable valve type fluid-filled anti-vibration support device characterized by being held.

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