JPS6348838Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolator, and more particularly to a vibration isolator that operates effectively even in a state without initial load.

For example, in an automobile engine or the like, it is required to take anti-vibration means to suppress changes in posture due to sudden fluctuations in torque caused by sudden acceleration or deceleration. The one shown in FIG. 1 is an example of a vibration isolator having the above-mentioned functions, and is constructed as follows. A supporting metal fitting 4 is embedded in the truncated conical part of an annular member 2 which is annular and has a truncated conical part, which is made of a rubber-like elastic material and has a substantially truncated conical shape. The spring members 3 are combined to form a main body 1, and a partition member 8 having a substantially disc shape and having an orifice 9 is fitted into the end of the main body 1 opposite to the spring member 3. A diaphragm 1 having a membrane shape and having flexibility, forming a first liquid chamber 10 therebetween.
3 is located on the side of the partition member 8 opposite to the spring member 3, the outer peripheral mounting part of which is pressed by an annular holding plate 14, and between the partition member 8 and the partition member 8, a first liquid chamber 10 is connected to the first liquid chamber 10 through an orifice 9. A substantially dish-shaped support member 17 is disposed to cover the diaphragm 13, and the flange attached to the outer peripheral end of the annular member 2 is connected to the outer peripheral part of the holding plate 14. The retaining plate 14 pushes the partition member 8 and the outer peripheral mounting portion of the diaphragm 13 toward the spring member 3 side. The first and second liquid chambers 10 and 15 are filled with hydraulic fluid. The partition member 8 is composed of two discs with a plurality of communication holes bored therein, and has a cavity formed by recesses formed on mutually opposing surfaces, and a rubber-like plate placed in the cavity. Membrane body 20 made of elastic material
The first liquid chamber 10 side and the second liquid chamber 15 side are isolated by this.

The vibration isolating device having the above structure has one of the support metal fittings 4 embedded in the spring member 3 and the support member 17 connected to the machine base side and the other to the supported body side, and can be used when stopped and in steady motion. As long as no sudden torque fluctuation occurs, the spring member 3 is kept in a substantially uncompressed state, as shown in the left half of FIG.
When torque fluctuation occurs due to rapid acceleration or deceleration, the spring member 3 is compressed and the first liquid chamber 10 is compressed, as shown in the right half of the figure.
The working fluid in the chamber passes through the orifice 9 and enters the second fluid chamber 1.
The elasticity of the spring member 3 and the flow resistance at the orifice 9 support the load caused by changes in the posture of the supported body due to torque fluctuations, and then against the repulsion caused by the energy stored in the spring member 3. In other words, as the spring member 3 expands, the second liquid chamber 1
The expansion of the spring member 3 is actuated by the flow resistance in the orifice 9 against the working fluid returned from inside the spring member 5 to the first fluid chamber 10 side. Membrane member 20 arranged in the internal space of partition member 8
When the spring member 3 is slightly compressed due to high-frequency vibrations of the supported body, it is pushed by the working fluid in the first liquid chamber 10 and expands toward the second liquid chamber 15, thereby absorbing the high-frequency vibrations. It has the effect of

In the example of the vibration isolation device described above, as described above, the rebound of the spring member 3 is restrained by the flow resistance in the orifice 9, and the diaphragm 13 is made of a rubber-like elastic material and is thin-walled, and does not have the ability to pressurize the working fluid in the second fluid chamber 15 toward the first fluid chamber 10. Therefore, the increase in the volume of the first fluid chamber 10 accompanying the expansion of the spring member 3 creates a negative pressure state in the first fluid chamber 10, and the flow resistance in the orifice 9 does not contribute at all to restraining the rebound of the spring member 3.
There is a risk that the damping function may not be sufficient.

The present invention aims to solve the problems in the vibration isolating device according to the prior art described above.

The vibration isolator according to the present invention has a main body formed by bonding a spring member made of a rubber-like elastic material to an annular member, and a partition member provided with an orifice facing each other to form a first liquid chamber. In addition to a structure in which a diaphragm is placed on the opposite side to form a second liquid chamber, and a support member that is approximately dish-shaped is placed to cover the diaphragm, a through hole is provided in the center of the partition member to allow bending and deformation. By adding a configuration in which a connecting member is movably disposed within the through hole of the partition member to connect the spring member and the diaphragm to each other, the diaphragm is pulled by the connecting member when the spring member rebounds. By reducing the volume of the second liquid chamber, the working liquid in the second liquid chamber is forced to be sent to the first liquid chamber, and the flow resistance when passing through the orifice is reduced through the diaphragm and the connecting member. This is done so that it is transmitted to the spring member and contributes to suppressing the repulsion of the diaphragm. The diaphragm is attached with a disk providing strength at the center, and the membrane portion is reinforced with a canvas or the like to be made into a strong membrane-like body that is flexible but not stretchable, and is used as a connecting member. In addition to making the connection between the first and second fluid chambers more solid, the force for pumping the hydraulic fluid from the first fluid chamber to the second fluid chamber is strengthened.

below. Embodiments of the vibration isolator of the present invention will be described based on the drawings. In the embodiment of FIG.
made of an annular member 2 and a rubber-like elastic material,
The spring member 3 in which the support fitting 4 is embedded is coupled to each other to form the main body 1, and the partition member 8 has an orifice 9 attached to a flange-shaped portion formed at the end of the main body 1.
is attached to form a first liquid chamber 10 between it and the main body 1, and a diaphragm 13 is made of a reinforced rubber membrane on the other side of the partition member and has a disk 23 embedded in its center. A second liquid chamber 1 is formed by the partition member 8 and the diaphragm 13 with the outer peripheral mounting portion attached.
A supporting member 17 having a substantially dish-like shape and provided with a ventilation hole 18 is disposed to cover the diaphragm 13, and a bent portion attached to an end of the supporting member 17 allows the flange of the main body 1 to be closed. The shaped part, the outer peripheral end of the partition member 8, and the outer peripheral mounting part of the diaphragm 13 are connected to each other, and the spring member 3 and the diaphragm 13 are bendable and deformable, for example, like a piano wire, and the connection is slidably penetrated through the partition member 8. A valve member 27, connected to each other by members 25 and having a generally snake-eye shape, is arranged in a cavity provided in the partition member 8 such that it can be moved slightly in the axial direction.

In the above-mentioned vibration isolating device, one of the support fitting 4 and the support member 17 embedded in the spring member 3 is connected to the supported body, and the other is connected to the machine base, so that the posture of the supported body changes. When the elasticity of the spring member 3 and
The flow resistance in the orifice 9 against the flow from the first liquid chamber 10 toward the second liquid chamber 15 suppresses a change in the posture of the supported body, and when the spring member 3 returns to its posture, As the diaphragm 13 is moved toward the partition member 8 by the spring member 3, the working fluid in the second fluid chamber 15 is forcibly sent toward the first fluid chamber 10, and the orifice 9 for this flow is forced. The flow resistance acts to suppress the repulsion of the spring member 3.

For high frequency vibration of the supported body, the partition member 8
The vibrations are absorbed by the movement of the valve member 27 arranged in the empty chamber inside.

The vibration isolating device of the present invention has the above-mentioned configuration, thereby achieving the following effects. A spring member and a diaphragm arranged to sandwich the partition member,
Since they are connected to each other by the bendingly deformable connecting member that passes through the partition member, when the volume of the first liquid chamber increases as the spring member restores its original shape, the increase in volume is caused by the tension of the connecting member. As the volume of the second liquid chamber decreases, the working liquid in the second liquid chamber is forcibly pumped into the first liquid chamber, and at this time, the flow resistance generated in the orifice acts as a spring through the diaphragm and the connecting member. Since it is transmitted to the spring member, the restraining action against the repulsion of the spring member is ensured.
Vibration absorption capacity increases significantly. The amount of change in the first liquid chamber and the second liquid chamber caused by the stroke of the spring member and the diaphragm, which are connected to each other via the connecting member, is such that the amount of change in volume on the first liquid chamber side is the same in the same stroke. 0 to 10%, preferably 0 to 10%, compared to the volume change on the second liquid chamber side
It is advantageous to design the structure and dimensions of each component such that the amount of the component is 5% less. If a relative inclination occurs between the axis of the spring member and the axis of the support member because the connecting member that connects the spring member and the diaphragm is bendable, the bending deformability of the connecting member will be reduced. This prevents the generation of loads acting in a direction transverse to the axis. In the illustrated embodiment, the connecting member is shown in the shape of a wire rod, but it is not necessarily limited to the wire shape as long as it has bending deformability, such as a close coil spring.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a vibration isolator according to the prior art, and FIG. 2 is a sectional view showing an embodiment of the vibration isolator according to the present invention. DESCRIPTION OF SYMBOLS 1... Main body, 2... Annular member, 3... Spring member, 4... Support metal fitting, 8... Partition member, 9... Orifice, 10... First liquid chamber, 13... Diaphragm, 14... ... Pressing plate, 15 ... Second liquid chamber,
17...Support member, 18...Vent hole, 19...
hole, 20... membranous member, 23... reinforcing plate, 25...
...Connecting member, 27... Valve member.

Claims (1)

[Scope of utility model registration request] Spring member 3 made of rubber-like elastic material and exhibiting a substantially disk shape
A main body 1 is formed by joining an annular member 2 having a substantially cylindrical shape to one end of the annular member 2. The main body 1 has a substantially disk shape and is provided with an orifice 9, and is arranged on the opposite side of the spring member 3 with respect to the main body 1. A partition member 8 forming a first liquid chamber 10 between the main body 1 and the partition member 8 is disposed on the opposite side of the main body 1 to the partition member 8. Orifice chair 9
A diaphragm 13 forming a second liquid chamber 15 that communicates with the first liquid chamber 10 through the diaphragm 13 is approximately dish-shaped and is disposed to cover the diaphragm 13, and is arranged to cover the main body 1, the partition member 8, and the It has a support member 17 that supports the outer circumferential end of the diaphragm 13 and a connecting member 25 that can be bent and deformed by penetrating the partition member 8 and connecting the spring member 3 and the diaphragm 13 to each other.
A vibration isolator whose liquid chambers 10 and 15 are filled with hydraulic fluid.