JPH09140840A - Golf club shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club shaft resistant to bending and twisting and capable of being made lightweight. SOLUTION: This golf club shaft is formed with multiple fiber-reinforced composite resin layers. The fiber-reinforced composite resin layer is provided with an inclined layer 1 having the inclined aligning direction of reinforcing fibers by ±(10-80 deg.) against the shaft axis, a parallel layer having the parallel aligning direction of reinforcing fibers against the shaft axis, and a perpendicular layer 3 having the perpendicular aligning direction of reinforcing fibers against the shaft axis. The total weight is set to 10-50 (g). At least one perpendicular layer 3 is arranged on the inside and the outside of the inclined layer 1 respectively, and one perpendicular layer 3 is located adjacently to one parallel layer 2.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a golf club shaft comprising a plurality of fiber reinforced composite resin layers.

[0002]

2. Description of the Related Art Generally, a golf club shaft of this type has a layer in which reinforcing fibers are inclined at a predetermined angle (for example, 40 to 45 °) with respect to the shaft axis in order to have torsional rigidity and strength. A layer in which reinforcing fibers are arranged in parallel with the shaft axis to provide rigidity and strength.
Further, in order to prevent compressive deformation in the radial direction of the shaft that occurs when a bending stress is applied, a prepreg sheet whose fiber direction is orthogonal to the shaft axis may be used in some cases.

[0003]

However, as described above, since the rigidity and strength are taken into consideration, the weight of the entire shaft becomes large, which is contrary to the weight reduction required in recent years. That is, if the shaft is made lighter, the weight of the head is increased correspondingly, and the moment of inertia at the time of hitting the ball is increased, which makes it possible to increase the initial velocity of the ball. Has been. Therefore, it is an object of the present invention to provide a golf club shaft which has the same strength as the conventional one and can be reduced in weight.

[0004]

In order to achieve the above object, a golf club shaft according to the present invention has a fiber reinforced structure in which the arranging directions of the reinforcing fibers are inclined ± (10 to 80 °) with respect to the shaft axis. The inclined layer of the composite resin layer, the parallel layer of the fiber-reinforced composite resin layer in which the arrangement direction of the reinforcing fibers is parallel to the shaft axis, and the fiber-reinforced composite in which the arrangement direction of the reinforcing fibers is orthogonal to the shaft axis. A golf club shaft comprising a plurality of fiber-reinforced composite resin layers together with an orthogonal layer of a resin layer, the total weight of which is 10 to 50 g, and at least one orthogonal layer is provided inside and outside the inclined layer. They are arranged and one orthogonal layer is adjacent to one parallel layer.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a golf club shaft according to the present invention. This golf club shaft is composed of a plurality of fiber reinforced composite resin layers, and the fiber reinforced composite resin layer has an arrangement of reinforcing fibers with respect to the shaft center. Direction is ± (10 to 80
°) It has a slanted inclined layer 1, a parallel layer 2 in which the arranging direction of the reinforcing fibers is parallel to the shaft axis, and an orthogonal layer 3 in which the arranging direction of the reinforcing fibers is orthogonal to the shaft axis. . Each of the layers 1, 2 and 3 has reinforcing fibers such as carbon fibers and glass fibers arranged in their respective directions and impregnated with a thermosetting resin such as an epoxy resin to form a prepreg, and the prepreg is heat-cured. It is a thing.

In this case, as the graded layer 1, 2 of a and b are used.
There are layers, and the inclination directions of the fibers are different. That is, the inclination angle θ of the fibers of the inclined layer 1 of (a) is + about 45 °, and the inclination angle θ of the fibers of the inclined layer 1 of (b) is about −45 °. As the parallel layer 2, there are three layers, Ha, D, and E, and as the orthogonal layer 3,
There are three layers, F, T, and J.

That is, this golf shaft has, in order from the inside, a vertical layer 3 of F, an inclined layer 1 of B, an inclined layer 1 of B, a parallel layer 2 of C, an orthogonal layer 3 of G, and a parallel layer 2 of D. Each of the orthogonal layer 3 of C and the parallel layer 2 of E is made of an FRP tubular body wound in a tubular shape, and the total weight of the shaft is 10 to 50 g. Specifically, a prepreg of each layer (a structure in which reinforcing fibers such as carbon fibers are arranged in each direction and impregnated with a thermosetting resin such as an epoxy resin) is formed, and the orthogonal layer 3
(F) and two inclined layers 1 (a) and 1 (b) (prepreg) are overlapped and wound on the tapered mandrel 4 shown in FIG. Then, parallel layer 2 (C) (prepreg)
Will be wound. Next, as shown in FIG.
(G) and the parallel layer 2 (D) are overlapped with each other, the orthogonal layer 3 (H) and the parallel layer 2 (E) are overlapped with each other, and the two prepregs are sequentially wound. After that, taping and firing are performed to remove the mandrel 4, tape peeling, etc., to form a tubular body composed of a plurality of (8 layers in the illustrated example) fiber reinforced composite resin layers.

Therefore, at least one orthogonal layer 3 is provided inside and outside the inclined layer 1, and one orthogonal layer 3 is adjacent to one parallel layer 2. Specifically, the orthogonal layer 3 is provided inside the inclined layers 1 and 1, and
The outer layers of 1 are the orthogonal layers 3 and 3 of G and T, the orthogonal layers 3 of G are the parallel layers 2 of C, and the outer layers of the orthogonal layer 3 of G are the parallel layers of D. The layer 2 is disposed, the parallel layer 2 of D is disposed inside the orthogonal layer 3 of C, and the parallel layer 2 of E is disposed outside the orthogonal layer 3 of C.

However, the mechanism of bending of the lightweight shaft has a small wall thickness, and therefore, when the bending stress is applied to the shaft, it is broken due to local buckling of the axially compressed portion and the inclined layer 1 It is conceivable that the fracture occurs due to the splitting of the joint portion of the graded layer 1 when a torsional stress is applied because of the small amount. The parallel layer 2 is most effective against the former compression, and it is effective to suppress the deformation of the parallel layer 2. Therefore, in the former destruction,
It is preferred to place the orthogonal layer 3 close to the parallel layer 2,
For the latter breakage, it is preferable to arrange the orthogonal layer 3 close to the gradient layer 1.

Therefore, if the orthogonal layer 3 is adjacent to the parallel layer 2 and at least the orthogonal layer 3 is arranged both inside and outside the inclined layer 1 as in the present invention, when a bending stress is applied, It is possible to effectively prevent, in a well-balanced manner, the breakage that occurs due to local buckling of the portion that is compressed in the axial direction and the breakage that occurs due to the splitting of the joint portion of the inclined layer 1 when a torsion stress is applied. .

Next, FIG. 4 shows another embodiment. In this case,
From the inside, F's orthogonal layer 3, G ''s orthogonal layer 3, B''s inclined layer 1, B ''s inclined layer 1, C''s parallel layer 2, C ''s orthogonal layer 3, D'parallel layer. The parallel layers 2 and 2'are respectively wound in a cylindrical shape. Therefore, also in this case, at least one orthogonal layer 3 is provided inside and outside the inclined layer 1, and one orthogonal layer 3 is adjacent to one parallel layer 2. More specifically, the vertical layers 3 of “H” and “TO” are arranged inside the inclined layers 1 and 1, and the orthogonal layers 3 of C ′ are outside the inclined layers 1 and 1.
Are arranged, and inside the orthogonal layer 3 of H ', the parallel layer 2 of H'
Are arranged, and the parallel layer 2 of d'is provided outside the orthogonal layer 3 of ch '.
Is arranged. As a result, this shaft is also resistant to bending and twisting. In addition, in FIG. 4, the white ring between the orthogonal layers 3 and 3 of'to 'is simply both layers 3 and 3.
The boundaries are shown in the figure, and in fact, they are in close contact with each other (the orthogonal layers 3, 3, 3 are also in close contact with each other in FIG. 5 described later).

[0013]

EXAMPLES Examples will be shown below. After forming the prepregs for each layer according to Table 1, each layer is wound around the mandrel 4, and then taping and firing are performed to remove the mandrel 4, tape peeling, etc. to form various shafts. Bending test, crushing test, and torsional fracture test were performed. Example 2 corresponds to FIG. 1, Example 4 corresponds to FIG. 4, Comparative Example 1 corresponds to FIG. 5, and Comparative Example 2 corresponds to FIG.

[0014]

[Table 1]

That is, in the first embodiment, the orthogonal layer 3, the inclined layer 1, the inclined layer 1, the orthogonal layer 3, the orthogonal layer 3, the parallel layer 2, the parallel layer 2 and the parallel layer 2 are arranged from the inside, In Example 3, the orthogonal layer 3, the inclined layer 1, the inclined layer 1, the parallel layer 2, the parallel layer 2, the orthogonal layer 3, the orthogonal layer 3, and the parallel layer 2 are arranged from the inside. In Comparative Example 3, The parallel layer 2, the orthogonal layer 3, the inclined layer 1, the inclined layer 1, the orthogonal layer 3, and the parallel layer 2 are arranged from the inside. That is, only Comparative Example 3 has 6 layers, and the others have 8 layers. Although each shaft is a tapered shaft, the inner diameter and outer diameter of corresponding portions of each shaft are the same.

In Table 1, 90 indicates orthogonal layers, inclination indicates inclined layers, and 0 indicates parallel layers. As for the inclined layer of the shaft in each example, the inner inclined layer is approximately + with respect to the shaft axis center.
It is inclined at 45 ° and the outer sloping layer is inclined at about −45 ° with respect to the shaft axis.

Each shaft has a total length of 1143 mm and a taper angle of about 0.4 °. The bending test was a three-point bending test, the point of 175 mm was measured at a span length of 300 mm, and the torsional fracture test was performed by fixing both ends of the shaft. 20 mm length for crush test
The test piece was cut out, and a radial crush test of the tubular body was performed.

As can be seen from Table 1, in the shaft of Comparative Example 1, the orthogonal layer was not provided outside the inclined layer, and
Since the orthogonal layer is not adjacent to the parallel layer, the torsional strength is superior to other shafts, but the bending strength is considerably low. In the shaft of Comparative Example 2, the orthogonal layer is arranged inside the inclined layer. Since it is not provided, it is superior to other shafts in bending strength, but shows a considerably low value in torsional strength. On the other hand, each of the shafts of Examples 1 to 4 has a good balance of bending strength and torsional strength, and is optimal as a measure against bending of the lightweight shaft. In addition,
The shaft of Comparative Example 3 has a good balance of bending strength and torsional strength, but is inferior in bending strength and crushing strength to the shafts of Examples 1 to 4.

[0019]

Since the present invention is configured as described above, the following effects can be obtained.

The golf club shaft is resistant to bending and twisting and can be made lighter.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a golf club shaft according to the present invention.

FIG. 2 is an explanatory diagram of a manufacturing method.

FIG. 3 is an explanatory diagram of a manufacturing method.

FIG. 4 is a sectional view of another embodiment.

FIG. 5 is a sectional view of a comparative example.

FIG. 6 is a cross-sectional view of another comparative example.

[Explanation of symbols]

 1 inclined layer 2 parallel layer 3 orthogonal layer

Claims (1)

[Claims] 1. An inclined layer 1 of a fiber-reinforced composite resin layer in which the arrangement direction of reinforcing fibers is inclined ± (10 to 80 °) with respect to the shaft axis, and the arrangement direction of reinforcing fibers is parallel with the shaft center. A golf club shaft comprising a plurality of fiber-reinforced composite resin layers, namely, a parallel layer 2 of the fiber-reinforced composite resin layer and an orthogonal layer 3 of the fiber-reinforced composite resin layer in which the arranging direction of the reinforcing fibers is orthogonal to the shaft axis. And the total weight is 10-50
g, and at least one orthogonal layer 3 is provided on each of the inner side and the outer side of the inclined layer 1, and one orthogonal layer 3 is provided.
Is adjacent to one parallel layer 2. A golf club shaft.