JPH0611394Y2 - Anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vibration damping device having the functions of a vibration damping rubber and an air spring.

(Prior Art) Conventionally, there are vibration damping rubbers and air springs as vibration damping devices. Vibration proof rubber is often used because of its simple structure and low cost, but it has a disadvantage that the amount of bending when a load is applied is small and the vibration proof effect is small because the rubber body is solid.

On the other hand, the air spring requires an air source and a pressure regulator to supply compressed air of about 1 to 5 km / cm ² , and the structure is complicated and the price is high, but it has more vibration-proof performance than vibration-proof rubber. Since it is several steps higher, it is widely used in specific fields.

An object of the present invention is to provide a vibration damping device having the functions of a vibration damping rubber and an air spring.

(Means for Solving the Problems) The vibration isolator of the present invention is made of a rubber-like elastic material, and is substantially bowl-shaped, and has a hollow hanging portion having a downwardly hanging central portion and an orifice at the lower portion. A hollow elastic body, a support plate body that seals the upper opening of the hollow hanging portion, and a substrate that seals the lower surface opening of the hollow elastic body and has a through hole in the center, and when a load is applied, At the same time the lower part of the hollow hanging part seals the through hole of the substrate by pressure contact of the hollow hanging part,
It is characterized in that the orifice of the hollow hanging portion communicates with the outside air through the through hole of the substrate.

(Example) Hereinafter, the present invention will be described based on examples.

The figure shows an embodiment of the present invention.

In the figure, a vibration isolator (1) of the present invention comprises a hollow elastic body (2) formed of a rubber-like elastic material in a substantially bowl shape. The hollow elastic body (2) has a hollow hanging portion (3) hanging downward at the center thereof. A lower part of the hollow hanging part (3) has a substantially hemispherical shape, and a hard member (9a) having an orifice (9) penetrating the hollow hanging part (3) is vulcanized and adhered to the tip part thereof. Has been done. The upper opening of the hollow hanging part (3) is sealed by a supporting plate (7), and a mounting bolt (8) is fixedly mounted on the upper surface of the supporting plate (7). The support plate (7) is adhered to the hollow elastic body (2) with an adhesive. The lower surface opening of the hollow elastic body (2) is sealed by a substrate (4) having a through hole in its substantially central portion. The substrate (4) is bonded to the outer edge portion of the hollow elastic body (2) and secondarily vulcanized and bonded, or is fixed by a bolt (6) via a ring (5) as shown in the figure. The through hole (10) provided in the substrate (4) faces the hard member (9a) having the orifice (9), and
When a load is applied on the support plate body (7), the lower part of the hollow hanging part (3) is brought into pressure contact with itself to be self-sealed. When no load is applied on the support plate (7), the through hole (10) is open, and therefore the hollow elastic body (2) is open to the atmosphere.

Further, a non-slip rubber plate (11) is provided on the lower surface of the substrate (4).
Are glued together.

Although not shown in the drawings, the vibration isolator (1) thus configured is arranged in four corners of the bottom surface of the surface plate, for example, as a set of 3 to 4 pieces, although not shown. In the state in which a load is applied, the inside of the hollow hanging part (3) is open to the atmosphere through the orifice (9), but in the hollow elastic body (2), the lower part of the hollow hanging part (3) is the substrate (4). ), Is in close contact with the opening of the through hole (10) and seals the through hole (10) to form an airtight chamber. When a large load is applied, the hollow hanging part (3) has an orifice in the lower part, so that it functions as a damper and the airtight chamber (2a) supports the load from all directions to prevent buckling of the hollow elastic body.

(Effect of the Invention) As described above, according to the vibration isolator of the present invention, since the through hole of the hollow elastic body is sealed by the hollow hanging portion when a load is applied, the air is forcibly supplied into the hollow elastic body. Instead, an airtight chamber is automatically formed, the function of an air spring can be exerted under atmospheric pressure, and a spring constant intermediate between the anti-vibration rubber and the air spring can be obtained.
Further, since the orifice that is constantly open to the atmosphere is provided in the hollow hanging portion, it can function as a damper against a large load. The spring constant can be adjusted as appropriate by changing the wall thickness and shape of the hollow hanging portion.

Further, since the hollow elastic body is almost an inverted bowl type, it is possible to make the spring constant non-linear with the spring constant becoming larger as the load increases.

[Brief description of drawings]

 FIG. 1 is a sectional view showing an embodiment of the vibration isolator of the present invention. 2 ... Hollow elastic body 3 ... Hollow hanging part 4 ... Substrate 7 ... Support plate 9 ... Orifice 10 ... Through hole

Claims (1)

[Scope of utility model registration request] 1. A hollow elastic body made of a rubber-like elastic material, which is substantially bowl-shaped, hangs downward in the central portion, and has a hollow hanging portion having an orifice in the lower portion, and an upper opening of the hollow hanging portion. And a support plate body that seals the lower surface opening of the hollow elastic body, and a substrate having a through hole in the central portion,
When a load is applied, the lower part of the hollow hanging part seals the through hole of the substrate by the pressure contact of the hollow hanging part, and at the same time, the orifice of the hollow hanging part communicates with the outside air through the through hole of the substrate. Anti-vibration device.