JPS6057032A - Rubber vibration insulator - Google Patents

Abstract

PURPOSE:To simplify the structure and enable the spring constant to be changeable in two steps by providing three frameworks combined by rubber-like elastic members and by adopting a means of connecting rigidly the 1st framework and the 2nd framework selectively. CONSTITUTION:In a rubber vibration insulator for a car engine mounting, etc., the 1st framework 1 and the 2nd framework 2 are linked together by a cylindrical rubber-like elastic member 4, and the 2nd framework 2 and the 3rd framework 3 are linked together by a rubber-like elastic member 6. A cap-shaped piston member 9, which is fixed to the framework 1, is formed movable inside a cup-shaped section 2a of the framework 2, which is filled with incompressible fluid leaving an air zone A. At the open end of the piston member 9, a valve element 12 is fitted to divide a chamber space 21 filled with fluid into two chamber spaces 21a and 21b, and this valve element is open/close controlled by a coil spring 20 and an electromagnetic coil 18. When the valve element 12 is open, the elastic members 4, 6 work, and when it is closed the 1st and 2nd frameworks 1, 2 are linked together, and therefore only the elastic member 6 works and the spring constant changes.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vibration isolating rubber device, particularly for elastically supporting an engine of a vehicle such as an automobile from the vehicle body, and for transmitting vibration between the engine and the vehicle body. Various so-called active control type anti-vibration rubber devices in which the spring constant changes have been proposed as engine-mounting anti-vibration rubber devices related to the engine mounting anti-vibration rubber device 6, which reduces vibration. When driving at idle, the vibration constant is set small to effectively damp small-amplitude vibrations such as idling vibrations, and when driving, large-amplitude vibrations such as engine shake cause the engine to move against the vehicle body. J that does not vary significantly: The spring constant is variably controlled to increase the spring constant.

OBJECTS OF THE INVENTION The present invention also aims to provide an acceleration control type anti-vibration rubber device in which the spring constant changes.
In particular, it is an object of the present invention to provide a vibration isolating rubber device in which the spring constant changes in two stages, has a simple structure, and has a high degree of freedom in setting the two spring constants.

Structure of the Invention According to the present invention, the above objects include a first frame, a second frame, a third frame, and the first frame and the second frame. a rubber-like elastic member that extends between the second frame body and the third frame body and connects them to each other; and a rubber-like elastic member that extends between the second frame body and the third frame body and connects them to each other. This is achieved by a vibration isolating rubber device having a member and a connecting means for selectively and rigidly connecting the first frame body and the second frame body to each other.

Effects of the Invention According to this configuration, when the connecting means is in the released state and the first frame and the second frame are not rigidly connected, the connection between the frame 1 and the frame 3 is prevented. The spring constant between the first frame body and the second frame body is determined by the composite spring constant of the first rubber-like elastic member and the second rubber-like elastic member. When the first frame body and the third frame body are rigidly connected, the spring constant of the first frame body and the third frame body is determined only by the spring constant of the second rubber-like elastic member; Since the spring constants of the shaped elastic members are individually and suitably set, the spring constant between the first frame body and the third frame body can be changed to two suitable spring constants by only releasing and fastening the connecting means. Switch between.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail with reference to embodiments with reference to the accompanying drawings.

FIG. 1 shows one embodiment of a vibration isolating rubber device according to the present invention. In the figure, 1 indicates a first frame, 2 indicates a second frame, and 3 indicates a third frame. First frame 1
The second frame body 2 and the third frame body 3 are arranged in this order in three layers vertically in the figure at predetermined intervals from each other.

The frame 1 is composed of a flat plate member 18 and a cup-shaped member 1b which are caulked to each other, and the frame 2 includes a cup-shaped portion 2a and a cup-shaped portion 2a whose flat bottom faces to the right and faces the flat frame 3. It has an annular extension part 2b provided on the outer periphery of the shaped part and facing the flat plate member 1a.

The frame body 1 and the frame body 2 are connected to each other by a cylindrical rubber-like elastic member 4 made of rubber or rubber-like material and extending between the flat plate member 1a and the annular flange portion 2b. There is. In the illustrated embodiment, the rubber-like elastic member 4- has one end directly adhered to the flat plate member 1a, and the other end caulked to the annular flange portion 2b by an annular member 5 adhered to the other end. has been done. The frames 2 and 3 are made of rubber or a rubber-like elastic material that surrounds the outer periphery of the cup-shaped portion 2a and extends between the bottom of the cup-shaped portion 2a and the frame 3. The members 6 are connected to each other by J:.

Mounting bolts 7 and 8 are attached to the cup-shaped member 1b of the frame 1 and the frame 1 body 3, respectively.
The frame 3 is fixedly connected to, for example, the outer wall of a cone engine by means of mounting bolts 8, and the frame body 3 is fixedly connected to, for example, a vehicle body by means of mounting bolts 8.

A piston member 9 in the shape of a piston is fixed to the frame 1, and the screw 1 member is fitted inside the cup-shaped portion 2a of the frame 2 so as to be movable in the direction of the f1 layer of the frame, that is, in the vertical direction. are doing. The tip opening edge of the piston member 9 is a cup-shaped portion 2
a, and a valve seat member 10 having a communication hole 11 is fixed to the frontage edge. The communication hole 11 is opened and closed by a valve element 12, and the valve element 12 is supported by a valve rod 13 connected to the valve element so as to be movable in the vertical direction in the figure from the frame 1.

The valve rod 13 is connected to a circulation hole 14 provided in the flat plate member 1a.
through the cup-shaped member 1b so as to be movable in its axial direction.
Actuating plate 1 by screw 15 at the tip located inside
6 is installed (pushed).

A solenoid device 17 including an electromagnetic coil 18 and a magnetic attraction member 19 is attached (pushed) inside the cup-shaped member 1b. The actuation plate 16 is magnetically attracted to the magnetic attraction member 19 against the spring force of 20.

In the valve element 12, when the electromagnetic coil 8 is energized, the actuating plates 1 to 16 are attracted to the magnetic attraction member 19, as shown in the figure, so that the valve seat member 10
The communication hole 11 is closed by connecting the electromagnetic coil 1 to
When 8 is not energized, the compression coil spring 20
is pushed down by the spring force and separated from the valve seat member 10,
Communication 7L11 is opened.

The chamber space 21 is filled with a predetermined amount of an incompressible fluid such as oil, so that the chamber space 21a is entirely filled with the incompressible fluid, and the chamber space 21b is partially filled with the incompressible fluid. The chamber space 21b is filled with fluid, and an air layer A is left above the chamber space 21b.

An O-ring 22 is attached to the sliding contact surface between the cup-shaped portion 2a and the piston member 9 to ensure the airtightness of the chamber space 21a, and the sliding contact surface between the flat plate member 1a and the valve shaft 13 is attached to the sliding contact surface of the chamber space 21a. An O-ring 23 is attached to ensure airtightness of the space 1b.

As shown in the figure, when the electromagnetic coil 18 is energized, the actuation plate 16 is attracted to the magnetic attraction member 19, and the valve element 12 closes the communication hole 11, the chamber space 21a
is sealed and an incompressible fluid is sealed in the chamber space, so that the cup-shaped portion 2a and the piston member 9 cannot move relative to each other, so that the frames 1 and 2 are rigidly connected to each other. be done. At this time, even if vibration is applied between the frames 1 and 3, the rubber-like elastic member 4 is not elastically deformed, and only the rubber-like elastic member 6 is elastically deformed. Therefore, the spring constant between the frames 1 and 3 at this time is determined only by the spring constant of the rubber-like elastic member 6.

When the electromagnetic coil 18 is not energized and the valve element 12 is pulled down by the spring force of the compression coil spring 20 and the communication hole 11 is open, the incompressible fluid in the chamber space 21 flows through the communication hole 11. Since the cup-shaped member 2a and the piston member 9 can freely move in and out of the chamber space 21b, the relative movement between the cup-shaped member 2a and the piston member 9 is not inhibited, and the rubber-like elastic member 4 and the rubber-like elastic member 6 can be freely elastically deformed. become a state.

At this time, when vibration is applied between the frames 1 and 3, the rubber-like elastic members 4 and 6 are each elastically deformed, and the air in the air layer A is compressed and expanded. Therefore, frame 1 at this time
The spring constant between and 3 is determined by the spring constant of the rubber-like elastic members 4 and 6 and the air spring constant of the air layer A.

The spring constant of the rubber-like elastic member 4 is K11 rubber-like elastic member 6.
When the spring constant of the air layer A is 2, and the air spring constant of the air layer A is Ka, the spring constant of the vibration isolating rubber device when the communication hole 11 is listening is 1 (a is shown by the following formula).

1/Ka= (1/2) + (1/ (Kl +
l<, ) ) = (Kl +k 2 +k +]
)/K 2 (Kl +1<3) Here, Kl is 5 K! + /mn, K2 to 5'0K
When CI/mm and Ka are set to 1Kq/mm, Ka becomes 5.3'(1/ml, and a very small spring constant is obtained.' Vibration-isolating rubber device when the communication hole 11 is closed The spring constant of is equal to 2 to the spring constant of the rubber-like elastic member 6, and when this is set as described above, the spring constant of the vibration isolating rubber device when the communication hole 11 is closed is 5'. OKo/
im, which becomes a very large value.

When the anti-vibration rubber device configured as described above is used as an anti-vibration rubber device for engine mounting, the energization to the electromagnetic coil 18 is controlled based on the engine rotation speed, accelerator pedal depression, vehicle speed, acceleration, etc. The electromagnetic coil 18 is energized and the spring constant of the anti-vibration rubber device is set to a high value when the engine is moving, accelerating, starting suddenly, starting the engine, and stopping the engine when the engine shakes significantly relative to the vehicle body. It is fine if it is done.

FIG. 2 shows another embodiment of the 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 those shown in FIG. In such an embodiment, the valve element 12 is provided with a chamber space 21.
A throttle passage 24 is provided that communicates the chamber space 21b with the chamber space 21b. In this embodiment, the valve element 12 is attached to the valve seat member 1.
0 and the communication hole 11 is closed (the chamber spaces 21a and 21b communicate with each other via the throttle passage 24. Therefore, even when the communication hole 11 is closed by the valve element 12, there is no air inside the chamber space 21b). The incompressible fluid is not completely enclosed, and the incompressible fluid in the chamber space 2Ia enters and exits the chamber space 21b through the throttle passage 24, so that the cup-shaped portion 2a
The relative movement between the piston member 9 and the piston member 9 is not completely prevented. Therefore, when vibration is applied between the frames 1 and 3, the rubber-like elastic member 3 is elastically deformed together with the rubber-like elastic member 6. It is suppressed by the flow resistance of the incompressible fluid flowing through the passage 24, and the apparent dynamic spring constant of the rubber-like elastic part @3 increases, and the incompressible fluid flowing through the throttle passage 24 causes a viscous damping effect. .

Thus, in the embodiment shown in FIG.
When the communicating hole 11 is closed, the spring constant of the vibration isolating rubber device becomes larger than when the communicating hole 11 is open, and at the same time, a viscous damping effect can be obtained.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to the above-described embodiments, and various other embodiments may be made within the scope of the present invention. It will be clear to those skilled in the art that this is possible.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing one embodiment of a vibration isolating rubber device according to the present invention, and FIG. 2 is a longitudinal sectional view showing another embodiment of the vibration isolating rubber device according to the present invention. DESCRIPTION OF SYMBOLS 1... First frame body, 2... Second frame body, 3... Third frame body, 4... First rubber-like elastic member, 5... Annular member. 6... Second rubber-like elastic member, 7.8... Mounting bolt. 9... Piston member, 10... Valve seat 81S material, 11
...Communication hole, 12...Valve element, 13...Valve stem, 1
4...Through hole. 15...screw, 16...operating play 1~, 17...
・Solenoid device, 18... Electromagnetic coil, 19...
Magnetic attraction member, 2'O... Compression coil spring, 21...
・Room space, 22. 23...0 ring, 24... Restricted passage property Applicant: I-Yota Automobile Co., Ltd.
Attorney Patent Attorney Akira ShokiFigure 1Figure 2

Claims (1)

[Claims] a first frame, a second frame, a third frame, and a rubber-like member extending between the first frame and the second frame to connect them to each other; an elastic member; a rubber-like elastic member extending between the second frame and the third frame to connect them to each other; and the first frame and the second frame. A vibration isolating rubber device having a connecting means for selectively and rigidly connecting the vibration isolating rubber device to the body.