JPS61228136A - Method of controlling elasticity of buffer material - Google Patents

Abstract

PURPOSE:To prevent an effect of absorbing impact and/or vibration from worsening, by providing conductive bars to be embedded in a buffer material, using synthetic resin as the base material, and electrifying said conductive bars so as to increase a temperature of the buffer material. CONSTITUTION:A buffer material 1 provides in its base body 2 of synthetic resin one or plural number of conductive bars 3, as necessary, to be embedded penetratively running over the whole length of the buffer material 1 and parallelly lining providing a space so that the conductive bars are disclosed in both end surfaces of the buffer material. If an electric current is conducted to flow in the conductive bars 3, the buffer material, enabling its elasticity to be suitably changed because the conductive bars generate heat increasing a temperature of the base body 2 of synthetic resin, can prevent the elasticity from deteriorating.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a shock absorber that elastically supports a supported body and absorbs shocks and vibrations. Concerning how to control the restoration.

<Technical Background> Cushioning bodies molded using synthetic resin or synthetic rubber as a matrix have been widely used for a long time, and are commonly molded into various shapes of synthetic resin with embedded or filled reinforcing material or synthetic resin alone. The developed materials are used in various fields. Furthermore, recently, even when it comes to leaf springs, so-called F'RP leaf springs, which are made by impregnating and hardening synthetic resin into a fiber woven laminate, and those reinforced with fillers have been adopted.

<Problem> Normally, the synthetic resin that serves as the base material for the shock absorber has a narrow operating temperature range of about 250°C to -50°C, and is not used for FRP leaf springs or reinforced materials. There is not much difference in the usable temperature range even with buffers. However, synthetic resin shock absorbers have the drawback that even within the above temperature range, the strength, hardness, rigidity, and elasticity vary greatly due to the properties of the synthetic resin that is the base material. In other words, when the temperature gets close to the upper limit temperature, the strength, rigidity, and elasticity decrease greatly, and the so-called "one spring fatigue phenomenon" tends to occur, and when the temperature gets close to the lower limit temperature, the strength and rigidity become abnormally high (and the elasticity decreases). There is a tendency to decrease.

As a result, in cold regions, synthetic resin shock absorbers and leaf springs lose their elasticity and become hard, reducing their ability to absorb shocks and vibrations, causing problems.

<Purpose of the Invention> The present invention embeds a conductor with high electrical resistance over its entire length in a buffer body made of synthetic resin, and when it is cold, electricity is applied to the conductor to generate heat, thereby heating the synthetic resin matrix. The material is heated to change its elasticity to an appropriate level of elasticity, thereby preventing the impact and vibration absorption effect from decreasing.

<Example> To explain the present invention with reference to drawings, the buffer body in FIG. 1 is illustrated as a plate as an example, but the buffer body (1) is a synthetic resin matrix (2) with an electric conductor (3) attached to the buffer body (1). If necessary, one or more rods are buried in parallel with gaps provided so that they run through the entire length and are exposed on both end faces.

The conductor (3) is made of a material that generates heat and raises the temperature due to its large electrical resistance when current is passed through it, such as nichrome wire, carbon fiber material, glass fiber material, conductive synthetic resin material, etc. can be used.

The nichrome wire generates a large amount of heat, and there is a great possibility that the temperature will become too high and melt the synthetic resin matrix (2), so it is necessary to adjust the amount of current applied. The fibrous material can be a twisted body, a string body, a woven fabric body, etc., and can be buried in different shapes depending on the purpose of the cushioning body (1). Although carbon fibers and glass fibers themselves are buried as reinforcing materials, there is no problem when they are used in combination with other types of reinforcing materials.

The plate-shaped shock absorber (1) with an embedded electrical conductor (j) is used, for example, as a leaf spring in a vehicle, etc., but as shown in Figure 2, it can be suspended on a vehicle singly or in multiple layers as needed. When the switch (7) is turned on and energized, the conductor (3) generates heat, which warms the synthetic resin matrix (2) and raises the temperature to a point where it has good elasticity. If the current and voltage can be adjusted according to the configuration, the desired elastic range can be maintained.

<Other Examples> Additionally, shock absorbers used for shock absorption and vibration isolation have various shapes such as plate, columnar, and hollow shapes, but the one shown in Figure 3(a) A twisted conductor (3) is embedded in the synthetic resin base (2) of the buffer (1), or a woven conductor (3) is placed vertically over the entire length as shown in Figure 3(b). It is also possible to embed a coil spring (8) coated with a conductor (3) as shown in Fig. 3(c), and to connect an electric wire to both ends, as explained in Fig. It is possible to control elasticity like this.

It goes without saying that the shapes of the buffer (1) and the conductor are not limited to those shown in the drawings.

As a result of tests, the method of changing the elasticity of the buffer body by applying electricity to it according to the present invention showed that B = -0,013 in a certain sample.
t + 5.5 However, E-flexural modulus (XIO3k
gf layer) - sample piece temperature (C) was established, and it was found that there was an effect of elastic change.

Test conditions Buffer composition Carbon fiber woven fabric embedded in nylon 66 Shape of test piece Flat plate Size Width 20m x Length 200m x Thickness 1.5
■〃 Resistance value 1.90 (room temperature) Test method Distance between fulcrums 48.3 m Crosshead speed 26 m Test piece condition Absolutely dry condition Conductive synthetic resin paint applied to both ends 5-pole test result → t (JILLC) Book The invention is to apply electricity to the electrical conductor of a synthetic resin buffer body with an electrical conductor embedded or as a reinforcing material to generate heat to warm the synthetic resin matrix, thereby improving the elasticity of the resin body by changing its elasticity depending on the temperature change of the resin body. Since the cushioning body is made to have good elasticity, it is possible to eliminate changes in the impact and vibration absorbing effect of the synthetic resin cushioning body due to changes in environmental temperature.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a state of use, and FIG. 3 is a partially cutaway perspective view of another embodiment. 1...Buffer 2...
......Synthetic resin matrix 3...
・・・・・・・・・Conductor patent claimant: Nippon Flex Industry Co., Ltd. Representative Yoshikazu Teraura

Claims (1)

[Claims] In a buffer body in which electrical conductors are embedded in a matrix of a synthetic resin molded product so that they run through the entire length, electric current is passed through the electrical conductors to generate heat, thereby heating the synthetic resin matrix, thereby improving elasticity. A method for controlling the elasticity of a buffer that changes the