JP4396909B2 - Sports tubular body made of fiber reinforced resin - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sports tubular body made of fiber reinforced resin using a synthetic resin as a matrix and reinforced with reinforcing fibers.
[0002]
[Prior art]
A sports tubular body made of fiber reinforced resin is bent and deformed like a fishing rod or a golf club. For this reason, durability (rigidity) against bending deformation is imparted as a tubular body mainly composed of reinforcing fibers oriented in the axial length direction. However, the tubular body may not only bend and deform, but may also crack along the axial length direction, or may be crushed and deformed in the cross-section of the tubular body. It has been practiced to form a tubular body by adding a layer mainly composed of reinforcing fibers oriented in a circumferential direction or an inclined direction intersecting the direction.
[0003]
[Problems to be solved by the invention]
However, in the case of a fiber reinforced resin tubular body having a low matrix resin and a high reinforcing fiber density, the boundary between the layers where the reinforcing fibers intersect is greater than the boundary between the layers where the reinforcing fibers are directed in the same direction. A large space is formed between adjacent fibers. The space should be filled with a synthetic resin as a matrix, but there may be voids in the synthetic resin, and a larger space must be filled with more resin, For this reason, the probability that a void is included increases, and when a void is included, the probability that a void becomes larger is high. If a void is included, when the tubular body is deformed, the tubular body is easily damaged from the portion, and the strength of the tubular body is reduced.
Therefore, an object of the present invention is to provide a sports tubular body that can prevent breakage from the boundary portion between layers intersecting in the direction of reinforcing fibers.
[0004]
[Means for Solving the Problems]
In the present invention of claim 1 In view of the above object, a first layer reinforcing fibers are oriented in one direction, a second layer reinforcing fibers are oriented in the other direction, and the first and second layers ; and a third layer located between, together with orientation of the reinforcing fibers of the third layer is coincident with the direction of the reinforcing fibers in any layer of the first layer or second layer, the third layer Provided is a fiber reinforced resin sports tubular body characterized in that the average fiber diameter of the reinforcing fibers is smaller than the average fiber diameter of the reinforcing fibers of the matching layer.
[0005]
According to the first aspect, the third layer having the fiber direction substantially coincided with any one of the first layer and the second layer intersecting with each other in the fiber direction is interposed. Since the average fiber diameter of the three layers is made small, the space between adjacent fibers at the layer boundary becomes smaller and the strength is improved than when the first layer and the second layer are directly adjacent to each other.
The layer thickness of the third layer may be about the same as or half the layer thickness of the matching layers. About half is about 40 to about 60%. Further, any other thickness relationship may be used.
[0006]
In claim 2, the orientation direction of the reinforcing fiber has a layer which is the axial direction, the layer adjacent to the axial length direction layer has at least one layer, the reinforcing fibers axial direction in the layer The crossing layer is oriented in a direction intersecting with it, the thickness of the crossing layer is considerably smaller than the layer thickness of the axial length direction layer, and the position within the axial length direction layer and adjacent to the crossing layer An average fiber diameter of the axial length direction reinforcing fibers in the adjacent layer is smaller than an average fiber diameter of the remaining axial length direction reinforcing fibers excluding the adjacent layer of the axial length direction layer. The present invention provides a sports tubular body made of a fiber reinforced resin, wherein the thickness of the adjacent layer is considerably thinner than the thickness of the remaining layer obtained by removing the adjacent layer from the axial length direction layer. The term “thinly thin” refers to a thickness of about half or less, preferably about a quarter or less.
[0007]
This is a structure in which the tubular body has a bending rigidity by an axial length direction layer, and is prevented from being crushed by a crossing layer of reinforcing fibers in a direction crossing the tubular body. A part of the axial length direction layer of the boundary portion between the two layers is an adjacent layer, and the average fiber diameter of the adjacent layer is configured to be smaller than the average fiber diameter of the remaining axial length direction reinforcing fibers of the axial length direction layer. In addition, the thickness of the adjacent layer is also made considerably thinner than the remainder of the axial length layer, and the bending characteristics of the tubular body are mainly governed by the remainder of the axial length direction layer excluding the adjacent layer. Thus, the space between adjacent fibers at the boundary with the intersecting layer can be reduced, and the strength of the tubular body is improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail based on an embodiment shown in the accompanying drawings.
FIG. 1 is a cross-sectional view of an essential part of a first embodiment of a tubular body according to the present invention. A reinforcing fiber DS having a large diameter is arranged in the central layer 10A in the thickness direction so as to be oriented substantially in the axial length direction, and a thin adjacent layer 10B is provided on the outer side thereof, and has a smaller diameter than the reinforcing fiber DS. The reinforcing fibers SS are arranged so as to be generally oriented in the axial length direction. In this example, a thin adjacent layer 10C is also provided inside the center layer, and the reinforcing fibers SS ′ having a smaller diameter than the reinforcing fibers DS are arranged so as to be oriented substantially in the axial length direction.
[0009]
The three layers 10A, 10B, and 10C are collectively referred to as an axial length direction layer 10. On the outer side and the inner side, the reinforcing fibers are generally oriented in the circumferential direction, and are thinner than the axial length direction layer. Layers 12 and 12 'are provided. Metal fibers such as boron can be used as the large-diameter reinforcing fibers DS, and inorganic fibers other than metal fibers such as carbon fibers and glass fibers can be used as the small-diameter reinforcing fibers SS and SS ′. This makes it possible to reduce the space between adjacent fibers at the boundary and prevent the generation of voids, compared to the case where the fibers in the layer in contact with the circumferentially oriented intersection layer are made of metal fibers having a large diameter. Strength is improved.
[0010]
Further, the central layer 10A is considerably thicker than the adjacent layers 10B and 10C, and the ratio of the large-diameter reinforcing fibers DS that are metal fibers in the axial length direction reinforcing fibers is considerably large. Metal fibers dominate. When bending occurs, a tensile load acts on the outer half of the deformed tubular body and a compressive load acts on the inner half. However, if the deflection is large, the inner compressive load is larger than the outer tensile load. In many cases, buckling failure of the tubular body due to the above occurs first. However, since many metal fibers with high compressive strength are used as the reinforcing fibers in the axial direction, the compressive strength becomes strong, and even if it bends greatly, it can be prevented from being damaged from the inside, so that a large amount of bending is possible. . That is, it can be said that the strength has been improved.
[0011]
Specific examples of the layer thickness of each of the layers 10A, 10B, 10C, 12, 12 ′ include 0.2 mm, 0.05 mm, 0.05 mm, 0.05 mm, 0.05 mm, etc. in order, and the adjacent layers 10B, 10C. When each layer thickness is set to about ¼ or less of the layer thickness of the central layer 10A, the characteristics of the metal fibers DS in the center layer become the dominant fibers of the bending characteristics of the tubular body. Further, specific examples of the layer thickness of each of the layers 10A, 10B, 10C, 12, 12 ′ are sequentially 0.1 mm, 0.05 mm, 0.05 mm, 0.05 mm, 0.05 mm, etc., that is, the adjacent layer 10B. , 10C may be about ½ of the thickness of the central layer 10A. The fiber diameter of the metal fiber DS as the large diameter fiber is about 15 to 125 microns, and when the carbon fibers SS and SS ′ as the small diameter fibers are solid fibers, the fiber diameter is about 4 to 10 microns, preferably It is about 4-7 microns.
[0012]
A hollow carbon fiber can be used in place of the metal fiber as the reinforcing fiber DS of the large diameter fiber, the fiber diameter is about 6 to 15 microns, and the presence of the adjacent layer prevents the generation of voids at the boundary as described above. Moreover, since the hollow carbon fiber has a higher longitudinal elastic modulus and a lower specific gravity than the metal fiber, as with the solid carbon fiber, it is a lightweight tubular body, and the flexural rigidity can be increased. That is, the specific rigidity can be improved. The fiber diameter is selected so that the average fiber diameter of the hollow carbon fiber is larger than that of the solid carbon fiber. Furthermore, a solid carbon fiber can be used as the large diameter reinforcing fiber DS, and a solid carbon fiber can be used as the small diameter reinforcing fiber. Of the aforementioned 4 to 10 microns, a large diameter article may be a large diameter reinforcing fiber DS, and a small diameter article may be a small diameter reinforcing fiber.
[0013]
FIG. 2 is another example of the embodiment, and the difference from the case of FIG. 1 is that the axial direction layer 10 includes a central layer 10A and two adjacent layers 10B and 10C whose thicknesses are not greatly different. It is composed of Therefore, the bending characteristic as a tubular body is governed by each of the three layers 10A, 10B, and 10C. Others are the same as the embodiment of FIG.
[0014]
In the above two embodiments, the intersecting layer is provided inside and outside the tubular body, but only one (outside or inside) may be provided. In the case of only the outer intersecting layer 12, the adjacent layer is only 10B, and 10C is unnecessary. Further, in the case of only the inner intersecting layer 12 ′, the adjacent layer is only 10C, and 10B is unnecessary. Furthermore, the crossing layer may have a fiber direction other than the circumferential direction, may be oriented in the inclined direction, and only needs to cross the axial length direction. Moreover, there is no restriction | limiting in particular as matrix resin, However, The epoxy resin as a thermosetting resin is suitable. Further, when the fiber cross section is elliptical or the like, it is replaced with a circle having the same cross-sectional area, and the diameter is defined as the fiber diameter.
[0015]
In the present invention, when the axial length direction fibers of the tubular body are densely arranged, the existence significance of the adjacent layer which is a layer of small diameter fibers is high. The fact that the fibers are densely arranged means that the matrix resin that fills the space between the fibers is so small that voids are generated when the resin ratio of the axial length direction layer 10 is a low resin ratio of about 10 to 25% by volume. However, the presence of the adjacent layer can prevent the occurrence of voids at the boundary with the intersecting layer, thereby improving the strength of the tubular body.
[0016]
【The invention's effect】
As apparent from the above description, according to the present invention, it is possible to provide a sports tubular body capable of preventing breakage from the boundary portion between layers intersecting in the reinforcing fiber direction.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part of a first embodiment of a tubular body according to the present invention.
FIG. 2 is a cross-sectional view of an essential part of a second embodiment of a tubular body according to the present invention.
[Explanation of symbols]
10 axial length direction layer 10A center layer (large diameter fiber layer)
10B, 10C Adjacent layer (small diameter fiber layer)
12,12 'intersecting layer (circumferential layer)
DS Large diameter reinforcing fiber SS, SS 'Small diameter reinforcing fiber

Claims (2)

Comprising a first layer reinforcing fibers are oriented in one direction, a second layer reinforcing fibers are oriented in the other direction, and a third layer located between the first layer and the second layer, The direction of orientation of the reinforcing fibers of the third layer matches the direction of the reinforcing fibers of either the first layer or the second layer, and the average fiber diameter of the reinforcing fibers of the third layer is equal to that of the matching layers. A sports tubular body made of fiber reinforced resin, characterized in that it is smaller than the average fiber diameter of the reinforcing fibers . A direction in which the reinforcing fiber is oriented in the axial length direction, at least one layer adjacent to the axial length direction layer, and a direction in which the reinforcing fibers in the layer intersect the axial length direction The thickness of the intersecting layer is considerably smaller than the layer thickness of the axial length direction layer, and there is an adjacent layer in the axial length direction layer at a position adjacent to the intersecting layer. And the average fiber diameter of the axial length direction reinforcing fibers in the adjacent layer is smaller than the average fiber diameter of the remaining axial length direction reinforcing fibers excluding the adjacent layer of the axial length direction layer, and the thickness of the adjacent layer. A sports tubular body made of fiber-reinforced resin, wherein the thickness is considerably smaller than the thickness of the remaining layer excluding the adjacent layer from the axial length direction layer.

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