JPH01269736A - Helical spring - Google Patents

Abstract

PURPOSE:To reduce the weight of a spring and to manufacture even a large spring at a low cost by using fiber reinforced resin as spring raw material, and arranging the direction of fibers of a spring element wire at an angle within a specified range with respect to the axis of the spring element wire. CONSTITUTION:Fiber reinforced resin is used as spring raw material, and the direction of fibers of the spring element wire is at an orientation angle + or -alpha deg.with respect to the axis of the spring element wire. The orientation angle + or -alpha deg.is determined depending on the ratio of bending and torsion, that is, spring load. It is good that alpha is 20 deg.-45 deg.. On the other hand, a flexible core 4 is filler material for keeping the cylindrical section of the element wire, and light-weight body is used as the core. As fiber reinforced resin is used as raw material of a helical spring 13, the highness of resiliency of raw material can be utilized and an orientation angle of reinforcing fiber can be obtained in order that raw material elastic property is optimum, so that the weight can be reduced. Helical springs of various properties can be obtained by varying the amount of reinforced fibers, drawing forming die and a mandrel, so that even a large spring can be manufactured at a low cost.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a fiber-reinforced resin helical spring.

[Conventional technology]

Conventional helical springs are mostly made of metal, except for very small ones and those for special purposes.

[The problem that the invention attempts to solve]

Conventional metal helical springs have the following problems.

(1) Metals have a low specific modulus of elasticity, and the ratio of the bending stiffness and torsional stiffness of the strands required for helical springs is constant, so there is little freedom in designing for weight reduction, and as a result, they are heavier. Since it has no choice but to be a helical spring, and furthermore, the degree of freedom in weight distribution is small, there are significant restrictions on dynamic optimal design.

(2) Manufacturing extremely large helical springs is technically difficult and tends to be expensive, and depending on the size, it may be impossible to manufacture.

[Means to solve the problem]

The helical spring according to the present invention is characterized in that the spring material is a fiber-reinforced resin, and the direction of the fibers of the spring wire is arranged at an angle of 2O2 or more and 45° or less with respect to the axis of the spring wire.

[Effect]

According to the present invention, since fiber-reinforced resin is used as the spring material, the specific modulus of elasticity can be increased, and the arrangement of the reinforcing fibers of the spring wire can be changed, making it possible to design an appropriate P111 property. It can have a great weight-reducing effect.

Furthermore, since the degree of freedom in molding is large, even large-sized products can be manufactured at relatively low cost.

[Exact example]

Figure 1 shows an example of the structure of the wire of a helical spring. Because the wire undergoes bending and torsion deformation at the same time, the reinforcing fibers of the spring tension are aligned in the direction of the axis of the wire. On the other hand, arranging the layers in two layers in the 0° and ±45° directions has the greatest weight reduction effect. Figure 1 (a) is an example of applying the above concept, and Figure 1 (b) is an example of applying the concept of
This is an example in which the arrangement angle with respect to the axial direction of the layers and spring wires is set to an intermediate value between ±α0, that is, Oo and ±456.

The ratio of the amount of reinforcing fibers in the 00 direction and the ±45° direction in FIG. 1(,) or the arrangement angle ±α0 in FIG. 1(e) is determined depending on the ratio of bending and torsion, that is, the spring load ff1K. α is preferably 20° to 45°. The flexible core in FIG. 1 is filled with a lightweight material to hold the cylindrical cross-section of the wire.

Figure 2 shows an example in which a weight adjustment mold is embedded in the tension wire, and this addition allows the resonance point, that is, the natural frequency, of the helical spring to be adjusted without affecting the side columns and strength of the multi-strand wire. It can be changed.

FIG. 3 shows an example of the apparatus for manufacturing the helical spring shown in FIG. 1(a).

After the required amount of reinforcing fibers are aligned in one direction and impregnated with resin in a resin bath, they are heated while being passed through a pultrusion molding material and molded into a circular cross-sectional shape. At this time, turn the heating to low to make the resin semi-hardened so that it can be easily bent and formed.The semi-hardened fiber-reinforced resin is then placed on a plaid loom with layers set at ±45°. The weave is continuously woven and then wound at the required pitch onto a mandrel having a predetermined outer diameter.After the required number of turns is further impregnated with the necessary resin, it is usually Curing treatment is performed in the same manner as the fiber-reinforced resin.

In the case of the structural example shown in FIG. 1(b), after the flexible core is put on a plaid loom, it is woven by the same process as shown in FIG. 3.

By changing the amount of reinforcing fibers, the pultrusion mold, and the mandrel, the above-described manufacturing apparatus can manufacture helical springs with various characteristics in exactly the same process and at low cost.

〔Effect of the invention〕

By using fiber-reinforced resin as the material for the helical spring, it is possible to take advantage of the material's high specific modulus of elasticity, and the arrangement angle of the reinforcing fibers can be determined to optimize the material's elastic properties. Therefore, the weight can be reduced.

Furthermore, since there is a large degree of freedom in molding, even large-sized products can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of a helical spring wire showing an embodiment of the present invention, Fig. 2 is a diagram showing an example in which a weight adjustment mold is embedded in the spring wire, and Fig. 3 is a diagram of the present invention. FIG. 1 is a diagram showing an apparatus for manufacturing a helical spring according to the invention. 1...±45° 45° direction 2...0° force direction member, 3
...±α0 direction member, 4...Flexible core, 5...
Weight adjustment mold, 6... Reinforced fiber with pin, 2... Resin impregnated tank, 8... Resin impregnated reinforcing fiber, 9... Pultrusion mold, 10... Fiber in half-cut state Reinforced resin, 11.
・・・Plaid loom, 12... Winding and sewage device, 13...
・Completed vine. (b) 1st-co.

Claims (1)

[Claims] A helical spring characterized in that the spring material is a fiber-reinforced resin, and the direction of the fibers of the spring wire is arranged at an angle of 20° or more and 45° or less with respect to the axis of the spring wire.