JPH026280Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a variable control type vibration isolating rubber device, and particularly to a variable control type vibration isolating rubber device used for engine mounting in vehicles such as automobiles.

BACKGROUND TECHNOLOGY As one of the vibration isolating rubber devices used for engine mounting of vehicles such as automobiles, two frame bodies are provided between the two frame bodies to connect them to each other, and the two frame bodies are connected to each other. a rubber-like elastic member defining a fluid chamber extending between the frame bodies, and one of the two frame bodies is provided with an opening passage that opens the fluid chamber to the outside of the fluid chamber. A variable control type anti-vibration rubber device has already been proposed, in which the opening passage is opened and closed by a closing plate.
No. 59-122447. This type of variable control type vibration isolating rubber device exhibits a relatively small dynamic spring constant when the opening passage is open, and effectively damps small amplitude vibrations; When closed, it exhibits a relatively large dynamic spring constant to suppress relative displacement of the two frames and avoid amplification of large-amplitude vibrations.

In the variable control type vibration isolating rubber device as described above,
The amount of change in the spring constant due to opening and closing of the opening passage increases as the passage cross-sectional area of the opening passage increases. Being configured to open and close the opening passage is advantageous in terms of structure and miniaturization of the design, and a variable control type vibration isolating rubber device equipped with such a closing plate is disclosed in Japanese Patent Application No. 58-223804. It is disclosed in the specification and drawings of .

Problems to be Solved by the Invention However, if the opening passage is configured to open and close by moving the closing plate in the axial direction of the opening passage, alternation of the fluid chamber due to vibration given to the vibration isolating rubber device Internal pressure fluctuations act on the closing plate as a closing force and an opening force, and therefore, in order for the closing plate to reliably close the opening passage, the closing plate must be driven in the closing direction with a considerably large closing force. In order to magnetically attract the closing plate and drive it in the closing direction, a relatively large electromagnetic coil is required, and moreover, a large amount of electric power is required.

The present invention aims to provide an improved variable control type anti-vibration rubber device that eliminates the above-mentioned problems in conventional variable control type anti-vibration rubber devices. an outer frame body having a pair of pieces facing each other; an intermediate frame body disposed between the pair of pieces;
A first piece provided between one of the pair of pieces and the intermediate frame, connecting the two pieces to each other, and extending inwardly between the one piece and the intermediate frame. a rubber-like elastic member defining a fluid chamber; a rubber-like elastic member provided between the other of the pair of pieces and the intermediate frame, connecting the two to each other; a rubber-like elastic member defining a second fluid chamber extending between the intermediate frame and the intermediate frame, the intermediate frame having the first fluid chamber and the second fluid chamber; A throttle passage with a small passage cross-sectional area and an open passage with a large passage cross-sectional area are provided which communicate and connect with each other, and on both sides of the intermediate frame body, a surface of the intermediate frame body on the side of the first fluid chamber and a surface of the intermediate frame body on the side of the first fluid chamber are disposed. Two shutoff plates are provided that close the opening passages by selectively seating on surfaces on the sides of the second fluid chambers, and are provided between the two shutoff plates to attract the two shutoff plates to each other. A variable control type anti-vibration rubber device characterized by being provided with an electromagnetic coil that magnetically attracts in a direction.

Functions and Effects of the Invention According to the above-described configuration, alternating internal pressure changes in the fluid chamber due to vibrations applied to the variable control type vibration isolating rubber device do not simultaneously act as an opening force on the two closing plates. When this is acting as an opening force on one closing plate, it acts as a closing force on the other closing plate, and when it is acting as an opening force on the other closing plate, it acts on one closing plate as a closing force, The opening passages are alternately and reliably closed off by the two closing plates, and the closing driving force is less than that required in the past, resulting in miniaturization of the electromagnetic coil and reduction in power consumption.

Embodiments Hereinafter, the present invention will be described in detail with reference to embodiments with reference to the accompanying drawings.

FIG. 1 shows one embodiment of a variable control type anti-vibration rubber device according to the present invention. In Figure 1, 1
2 indicates an outer frame body, and 2 indicates an intermediate frame body.
The outer frame body 1 has a pair of pieces 3 and 4 facing each other.
It is formed in a U-shape with a .
The intermediate frame body 2 is disposed at an intermediate portion between the pair of pieces 3 and 4, and is adapted to be attached to, for example, a vehicle body using an attachment piece 2c.

A rubber-like elastic member 6 is provided between one piece 3 of the outer frame 1 and the intermediate frame 2, and the rubber-like elastic member is directly vulcanized onto the piece 3 on one side. It is fixedly connected to one side of the intermediate frame 2 by means of a mounting bracket 7 and a mounting bolt 8 which are glued and vulcanized on the other side. The rubber-like elastic member 6 defines on its inside a first fluid chamber 9 extending between the piece 3 and the intermediate frame 2 .

A rubber-like elastic member 10 is provided between the other piece 4 of the outer frame 1 and the intermediate frame 2.
The rubber-like elastic member is directly vulcanized and bonded to the piece 4 on one side, and attached to the intermediate frame body on the other side by means of a mounting bracket 11 and a mounting bolt 12 that are vulcanized and bonded to the other side. fixedly connected to the other side of 2.
The rubber-like elastic member 10 defines on its inside a second fluid chamber 13 extending between the piece 4 and the intermediate frame 2.

The intermediate frame 2 is provided with a throttle passage 14 having a small cross-sectional area and an open passage 15 having a large cross-sectional area, which communicate and connect the first fluid chamber 9 and the second fluid chamber 13 to each other.

First and second fluid chambers 9 and 13 and throttle passage 1
4 and the open passage 15 are filled with a liquid having an appropriate viscosity, such as silicone oil, or other fluid.

A closing plate 16 is provided on one side of the intermediate frame 2, and another closing plate 17 is provided on the other side of the intermediate frame 2.
are arranged respectively. The closing plates 16 and 17 are
Opening and closing of the opening passage 15 is performed in the vertical direction in the figure, that is, in the extending direction (axial direction) of the opening passage 15, by the elastic support membranes 18 and 19, each made of rubber or a rubber-like product. It is supported so as to be movable in the direction, and in a free state is located at an open position away from both surfaces 2a and 2b of the intermediate frame 2. The closing plate 16 is located in the first fluid chamber 9 and closes the opening passage 15 by seating on one surface 2a of the intermediate frame 2, whereas the closing plate 17 closes the opening passage 15 in the second fluid chamber 13. The opening passage 15 is closed by being seated on the other surface 2b of the intermediate frame 2. That is, the two closing plates 16 and 17 are provided facing each other with the intermediate frame body 2 in between. Incidentally, the elastic support membranes 18 and 19 each have communication holes 20 to prevent the fluid chambers from being separated.
and 21 are provided.

The intermediate frame body 2 has an annular electromagnetic coil 22 installed around the open passage 15 thereof. Electromagnetic coil 22
is located between the two closing plates 16 and 17, and when excited, it magnetically attracts the closing plates 16 and 17 in the direction of attracting them to each other, and the elastic support membrane 18 and They are seated on the surface portions 2a and 2b of the intermediate frame 2, respectively, against the elastic force of the intermediate frame 2.

When the electromagnetic coil 22 is not energized and is not excited, the closing plates 16 and 17 are separated from the surfaces 2a and 2b of the intermediate frame 2 by the elastic support membranes 18 and 19, respectively. Located in position. At this time, the open passage 15 is open and the first fluid chamber 9 and the second fluid chamber 13 communicate with each other through the open passage 15 in addition to the throttle passage 14. , the fluid in the first fluid chamber 9 and the fluid in the second fluid chamber 13 are connected to the open passage 15.
By allowing the flow to enter and leave the other fluid chamber without being substantially restricted, the dynamic spring constant of the variable control type anti-vibration rubber device is kept at a small value.
High-frequency, small-amplitude vibrations that cause idle vibrations or muffled sounds are effectively damped.

On the other hand, when the electromagnetic coil 22 is energized and excited, the closing plates 16 and 17 are seated on the surfaces 2a and 2b of the intermediate frame 2, respectively, thereby closing the opening passage 15 and closing the opening passage 15. The fluid chamber 9 and the second fluid chamber 13 communicate with each other only through the throttle passage 14. At this time, when the fluid in the first fluid chamber 9 and the fluid in the second fluid chamber 13 flow to the other fluid chamber through the throttle passage 14, the flow of the fluid is throttled, thereby producing a viscous damping effect.
Based on a large viscous damping coefficient and a large dynamic spring constant, low-frequency, large-amplitude vibrations such as engine shakes and maneuvers can be effectively damped with a large damping force.

As mentioned above, when the outer frame is displaced downward in the figure with respect to the intermediate frame 2 while the opening passage is closed by the closing plates 16 and 17,
The internal pressure of the first fluid chamber 9 increases, and the internal pressure of the second fluid chamber 13 decreases, which causes the closing plate 16 to have a force that further presses it against the surface 2a of the intermediate frame 2. acts on the closing plate 17, and a force acts on the closing plate 17 in a direction to separate it from the surface portion 2b of the intermediate frame 2.
However, the force due to the decrease in the internal pressure of the second fluid chamber 13 only acts on one surface of the closing plate 17, and the force due to the increase in the internal pressure of the first fluid chamber 9 does not act on the other surface. A large opening force is not applied to the closing plate 17, and even if the magnetic attraction force of the electromagnetic coil 22 is not so large, the closing plate 17 is not separated from the surface portion 2b of the intermediate frame 2.
Furthermore, even if the closing plate 17 is separated from the surface 2b of the intermediate frame 2, the closing plate 16 is securely seated on the surface 2a of the intermediate frame 2 at this time, so that the opening passage 15 allows The first fluid chamber 9 and the second fluid chamber 13 do not communicate with each other.

Contrary to the above-mentioned operation, when the outer frame body is displaced upward in the figure with respect to the intermediate frame body 2, the internal pressure of the second fluid chamber 13 increases, whereas the internal pressure of the first fluid chamber 9 increases.
, the internal pressure of the electromagnetic coil 22 decreases, and an operation completely opposite to the above-mentioned operation is performed, and even at this time, even if the magnetic attraction force of the electromagnetic coil 22 is not very large, the opening passage 15 is reliably opened by the closing plates 16 and 17. Closed.

FIG. 2 shows another embodiment of the variable control type anti-vibration rubber device according to the present invention. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals as in FIG. In this embodiment, an electromagnetic coil 22 is attached to the closure plate 16 and is located within the open passageway 15 between the two closure plates 16 and 17 and is supported by an elastic support membrane 23. It is supported by the intermediate frame body 2.
One end of a rod 24 provided through the other closing plate 16 is fixed to the closing plate 17, and a stopper flange 25 is attached to the other end of the rod.
is attached, and the electromagnetic coil 22 and the closing plate 17
A compression coil spring 26 is provided between the two. When the electromagnetic coil 22 is excited, it urges the closing plates 16 and 17 toward each other against the spring force of the compression coil spring 26.

In this embodiment as well, the opening passage 15 is closed by the closing plates 16 and 17 provided on both sides of the intermediate frame 2.
By closing the opening passage 15, the opening passage 15 is reliably closed without requiring a very large electromagnetic coil 22, as in the embodiment described above.

In the above, the present invention has been described in detail with respect to specific embodiments, but the present invention is not limited to these and various embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the variable control type vibration isolating rubber device according to the present invention, and FIG. 2 is a longitudinal cross section showing another embodiment of the variable control type vibration isolating rubber device according to the present invention. There is a diagram. 1... Outer frame body, 2... Intermediate frame body, 3, 4...
Piece, 5...Mounting bolt, 6...Rubber-like elastic member, 7...Mounting bracket, 8...Mounting bolt, 9...
First fluid chamber, 10...Rubber-like elastic member, 11...
... Mounting bracket, 12 ... Mounting bolt, 13 ... Second fluid chamber, 14 ... Restricted passage, 15 ... Open passage, 16, 17 ... Closing plate, 18, 19 ... Elastic support membrane, 20, 21... Communication hole, 22... Electromagnetic coil, 23... Elastic support membrane, 24... Rod, 2
5... Stopper plate, 26... Compression coil spring.

Claims (1)

[Scope of utility model registration request] an outer frame body having a pair of pieces facing each other; an intermediate frame body disposed between the pair of pieces;
A first piece provided between one of the pair of pieces and the intermediate frame, connecting the two pieces to each other, and extending inwardly between the one piece and the intermediate frame. a rubber-like elastic member defining a fluid chamber; a rubber-like elastic member provided between the other of the pair of pieces and the intermediate frame, connecting the two to each other; a rubber-like elastic member defining a second fluid chamber extending between the intermediate frame and the intermediate frame, the intermediate frame having the first fluid chamber and the second fluid chamber; A throttle passage with a small passage cross-sectional area and an open passage with a large passage cross-sectional area are provided which communicate and connect with each other, and on both sides of the intermediate frame body, a surface of the intermediate frame body on the side of the first fluid chamber and a surface of the intermediate frame body on the side of the first fluid chamber are disposed. Two shutoff plates are provided that close the opening passages by selectively seating on surfaces on the sides of the second fluid chambers, and are provided between the two shutoff plates to attract the two shutoff plates to each other. A variable control type anti-vibration rubber device characterized by being provided with an electromagnetic coil that magnetically attracts in a direction.