JPH0681973B2 - Anti-vibration rubber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an anti-vibration rubber having two types of spring characteristics, and in particular, to a vehicle mounted when vibration conditions change such as when an automobile is idling and when it is running. Regarding air dampers used to prevent vibration of equipment.

[Prior Art] When mounted on a vehicle, the vibration of the automobile in an idling state has an extremely low frequency, and the spring constant of the damper is lowered in order to perform vibration isolation in this state. Therefore, when the vehicle starts traveling, the displacement of the device supported by the damper becomes large due to vibration, which causes the device to hit an adjacent object and lose the anti-vibration effect.

[Configuration of Invention] Therefore, in the present invention, the spring characteristic can be changed, and in order to enhance the vibration isolation effect at the time of idling of the automobile and at the time of traveling, the present invention supports the secondary spring characteristic during traveling. The change caused by the vibration of the above-mentioned device was made small. To this end, a spring-shaped shape memory alloy is used, which is made of nickel, titanium, etc., and is subjected to shape memory treatment, etc., and returns to the memorized shape when heated or cooled or given an arbitrary temperature. Sometimes the spring constant of the damper is low and a vibration isolation effect is obtained, and when running, an arbitrary memorized temperature is given to the shape memory alloy spring to increase the spring constant, reducing the displacement of the supported device, and The damping effect is enhanced by the air-fluid resistance of the metal fittings provided with the flow holes.

[Example] The cylindrical rubber-like elastic body 2 has an opening 7 at the top,
A washer 5 is fixedly attached to the bottom to cover the inside, and
A metallic upper plate 3 which is floated and supported by a shape memory alloy spring 1 is housed with a space between it and the opening 7 of the rubber-like elastic cylinder 2. The size of the upper plate 3 is a cylindrical type. The rubber elastic body 2 is sized to tightly engage with the upper opening 7 of the rubber-like elastic body 2, and an air flow hole 4 is provided at the center of the upper plate 3.
Further, a tension spring 6 is mounted between the upper plate 3 and the washer 5.

Further, the shape memory alloy spring 1 is in a state different from the shape memory temperature in a normal state, and does not have a spring property to the cylindrical rubber elastic body 2.

Therefore, when a load is applied to this anti-vibration rubber, only the outer rubber-like elastic cylinder 2 acts as a spring, and only the elastic spring constant serves as a vibration damping force. At this time, the upper plate 3 supported by the shape memory plywood spring 1 is separated downward by the tension spring 6 and stopped.

Next, when it becomes necessary to enhance the vibration insulation effect as when the vehicle is running, when the temperature memorized by warm air or the like is applied to the shape memory alloy 1, the shape is restored to the memorized shape.
As shown in the figure, the upper plate 3 supported by the shape memory alloy spring 1 is lifted to close the upper opening 7 of the elastic cylinder 2. As a result, the anti-vibration rubber has a spring constant that is the sum of the spring constant of the elastic cylinder 2 and the spring constant of the shape memory alloy spring 1, and the spring constant increases. Since the upper plate 3 is provided with the air flow hole 4, the air fluid resistance is obtained and the vibration damping effect is enhanced.

The force of the tension spring 6 is weaker than the force of the shape memory alloy spring 1 to return to the stored shape at the shape memory temperature, and the shape memory alloy spring is released from the closed state at a temperature other than the shape memory temperature. It must be set stronger than the force required for.

[Effects of the Invention] As described above, according to the present invention, the spring constant can be changed in accordance with the idling state of the vehicle and the traveling state of the vehicle. As a result, the vibration isolation effect is enhanced in the idling state, and the vehicle travels. In the state, the device displacement could be reduced, and the vibration damping effect could be enhanced by the air fluid resistance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view in a state where the shape memory alloy spring has not reached a memory temperature. FIG. 2 is a cross-sectional view of the shape memory alloy spring at a memory temperature and returned to a memory shape. 1 …… Shape memory alloy spring 2 …… Rubber elastic cylinder 3 …… Upper plate 4 …… Air flow hole 5 …… Washer 6 …… Tension spring, 7 …… Opening

Claims (1)

[Claims] 1. An upper plate having air flow holes is floated and supported by a shape memory alloy spring inside a cylindrical rubber elastic body having an opening at the top and a bottom covered with a washer. A tension spring is mounted between the upper plate and the washer, and when the temperature at which the shape memory alloy spring is stored is given, the upper plate having the opening of the rubber elastic body attached to the memory alloy spring seals. Anti-vibration rubber characterized by having a shape memory.