JPH01131342A - Waveform ring spring having integrated structure - Google Patents

Abstract

PURPOSE:To provide a waveform spring which is easy to mold and has a weight reducing effect, by a method wherein a waveform ring formed by a fiber- reinforced composite material, in which reinforcing fibers are orientated in a circumferential direction, has a ring surface formed in a waveform formed with a plurality of radial ridge parts and root parts. CONSTITUTION:An FRP reinforced fiber is a high resilient fiber, e.g., carbon fibers, and the fibers are orientated circumferentially of a ring. A spring body 1 is formed such that a plurality of waveform rings are overlapped with each other. Each waveform ring has a ring surface formed in a waveform formed with a plurality of radial ridge parts 2 and root parts 3, and has spring function as a result of the waveform ring being bent and deformed vertically the virtual plane of the ring. Since the ridge part 2 and the root part 3 are formed toward the center of the ring, concentration of a stress is prevented from occurring during exerting of a load.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a wave ring spring made of a monolithic fiber reinforced composite material (hereinafter referred to as FRP).

This product has performance that could not be achieved with FRP coil springs.

[Prior art and problems]

While FRP's high specific modulus of elasticity is attracting attention, the application of FRP to springs is also increasing due to its light weight effect, etc.
The reason why the transition to RP is slow is due to the following reasons. That is, the mechanical property required for a coiled spring is a high transverse elastic modulus, and for this reason, the reinforced aH is required to have a structural length of ±45° with respect to the axis of the coiled wire. . Therefore, in order to manufacture this, it is necessary to further wind the reinforcing fiber around an arbitrarily selected core material in order to coil the reinforcing fiber into ±45'. In addition to this hassle, the core material is usually reinforced with 1s1
1 has the disadvantage that the core material is bent during coiling and wrinkles occur because the core material is wound in a straight state.

In addition, in order to reduce the weight of the spring itself, the wire must be hollow, but it is extremely difficult to form a hollow coil spring in which the reinforcing fibers are oriented at ±45'' with respect to the axis of the coil wire. Currently, a molding method that is suitable for mass production has not been found.

[Object and structure of the invention]

The present invention breaks through the current situation and provides FRP that is lightweight and has a high opening angle, and has performance that could not be achieved with coil springs.
The purpose of this invention is to provide a manufactured wave ring spring.

Coil springs using fiber reinforced materials are difficult to mold and pose manufacturing problems, so the inventors of the present invention have made extensive studies to solve this problem. As a result, the problem could not be solved by following the form of a coil spring, and a wave ring spring with ridges and troughs in the circumferential direction was suitable for the purpose, easy to mold, and a coil spring with n. It was found that the weight reduction effect was large. The present invention was completed based on this knowledge.

In summary, the present invention is as follows.

The spring element is a wave ring made of a fiber-reinforced composite material with reinforcing fibers oriented in the circumferential direction, and is constructed by overlapping a plurality of wave rings, each wave ring having a ring surface with a plurality of radial ridges. forms a waveform consisting of and troughs,
The wavy ring has a spring function by bending and deforming in response to a load perpendicular to the imaginary plane of the ring, and the ridge of one wavy ring and the trough of the other wavy ring of the overlapping wavy springs are in the imaginary plane. A one-piece fiber-reinforced composite taxidermied wave ring spring that is molded to meet and form a single piece.

In the present invention, an integral structure refers to a structure that is integrated during molding.

As is well known, when a coil spring is subjected to a load, the strands are mainly subjected to torsional load. On the other hand, in the case of a wave ring spring, bending loads are applied and therefore reinforcement II
This means that N may be oriented in the circumferential direction of the ring. Therefore, the wave-shaped ring spring can be formed extremely easily by a filament winding method, a compression molding method, or the like.

In the present invention, the reinforcing fibers of FRP are high elastic fibers such as carbon fibers, glass fibers, and aromatic polyamide fibers. In particular, carbon fiber filaments have vibration damping properties, high specific elasticity,
^Preferable from the viewpoint of specific strength. Also, these lllff
can be used alone or in combination. When used in combination, different reinforcing materials IIN can be arranged in layers, ie, in a so-called hybrid structure.

The matrix resin of the fiber reinforcement material is an epoxy resin, a vinyl ester resin, an unsaturated polyester resin, a furan resin, a phenol resin, a polyimide resin, or the like.

In the present invention, the reinforcing fibers must be oriented primarily in the circumferential direction of the ring. This is because, as mentioned above, a ring spring is subjected to a torsional load, whereas the waveform ring spring of the present invention is subjected to a bending load even though it is ring-shaped.

By using a prepreg sheet or the like in combination, the reinforcing fibers can be oriented at an angle with respect to the circumferential direction depending on the purpose.

In the present invention, a virtual plane is an imaginary plane parallel to the horizontal plane that shares each edge of the wave ring spring when the wave ring constituting the integrated structure of the present invention is placed on a horizontal plane. refers to the surface

In the present invention, the ridges and valleys need to be shaped radially toward the center of the ring.

In addition, some or all of the reinforcing fibers can be oriented in a way that crosses each other at the connection between rings, that is, continuously from one ring to another, or the connection can be made of only matrix resin. It is also possible to configure The orientation of the reinforcing fibers needs to be considered depending on the conditions of use of the spring, etc.

Although it is possible to fabricate individual wave rings, which are the grooves or units of a wave ring spring with an integral structure, and then roughly roughen them to form a spring, the wave ring spring with an integral structure as in the present invention can be assembled. In addition to being able to omit the process, it also has the advantage of increasing the strength of the connection.

The present invention will be explained with reference to the drawings.

FIG. 1 is a plan view of a monolithic corrugated ring beam of the present invention;
FIG. 2 shows a side view of the same spring. FIG. 3 shows an assembled view of the mold, and FIG. 4 shows a perspective view of the mold. In FIG. 1, 1 is the spring body, 4 is the inner peripheral end of the ring, and 5 is the outer peripheral end. In FIG. 2, 2 indicates a ridge and 3 indicates a trough. 1st
Although the cross section of the spring body in FIG. 2 and FIG.
It may be square or a modification thereof. Further, it is not necessary that the entire section has the same cross-sectional area. This figure does not limit the number and dimensions of the rings, the number of ridges and valleys in the ring, and the structure of the mold. The shape from the ridge to the valley may be linear or curved, but care must be taken to avoid stress concentration during loading.

(Example) The wave-shaped ring spring shown in FIGS. 1 and 2 was manufactured by a filament winding method. That is, carbon fibers (Besphite 1-ITA-7-6000 manufactured by Toho Rayon Co., Ltd.) impregnated with epoxy resin in advance were wound in the gap of the mold shown in FIG. 3, and molded after heating and curing. It was confirmed that this molding was very simple. The outer diameter of the ring is φt30Iam
, the inner f-shaped element is φ100mm and its thickness is 2.8ffim.
When the spring constant was measured with the total height of the spring being 140 mm and 1q, it was Ik (If/mm).

〔Effect of the invention〕

The spring weight Φ in comparison with the case where the same spring constant was attempted to be obtained with a conventional coil spring whose coil center diameter was φ115 mm, which is the same as that of the wave ring spring.
I held a school ceremony. Comparisons were made between three types of materials used: iron, glass fiber reinforced plastics, and carbon fiber reinforced plastics, and between solid and hollow coil springs. The results are shown in Table 1.

Reinforcement of fiber reinforcement I! The fiber is ±45″ to the coil wire.
The hollow coil has a wall thickness of 1/10 of the outer diameter.

The weight in Table 1 indicates the weight of the coil spring, but
All of them are heavier than the weight of one wave ring spring, which is 2jOgr. It was confirmed that the wave-shaped ring spring is easy to mold and has a large aging effect.

The wavy ring spring of the present invention, which is made of one piece M4, has a great light weight effect and can be mass-produced by molding, making it extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 shows one of the integral structure wave ring springs according to the present invention.
An example is shown in a plan view. FIG. 2 shows a side view of the spring of FIG. FIG. 3 shows a side view of the spring filament winding mold V shown in FIGS. 1 and 2. FIG. FIG. 4 is a perspective view showing an example of a mold for molding a wave-shaped ring spring according to the present invention. In the figure, 6 is a cylindrical or cylindrical mold, 7 is an attached mold, and these two are combined to constitute a molding mold. The fibers are wound and molded in the groove 8 when the attached mold is attached. Patent Applicant: Toyo Rayon Hayashi Shiki Company Patent Attorney: Doi San Department Figure 1 Figure 3 Figure 2 Figure 4

Claims (2)

[Claims] (1) A spring element is a wave ring made of a fiber-reinforced composite material with reinforcing fibers oriented in the circumferential direction, and is constructed by overlapping multiple wave rings, each wave ring having a ring surface with a plurality of radial shapes. Forms a waveform consisting of ridges and valleys, and has a spring function by bending and deforming the waveform ring in response to a load perpendicular to the imaginary plane of the ring, and one waveform ring of the overlapping waveform springs. A wave ring spring made of a fiber-reinforced composite material having an integral structure, which is formed so that the ridges of the ring and the valleys of the other wave ring are in contact with each other in a virtual plane and are integral with each other. (2) Claim (1) in which the reinforcing fiber is carbon fiber
Wave ring spring as described.