JP2005160729A - Golf club shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily prepare a different golf club shaft having desired characteristic and to provide the golf club shaft by which feeling of uniformity between different golf club shafts is obtained. <P>SOLUTION: The golf club shaft is provided with first to third fiber reinforced resin layers whose fiber orientation direction is set to be nearly parallel to a shaft axis and which include fiber of different elastic modulus. The first to third fiber reinforced resin layers are arranged laminated in a prescribed order, Thus, the golf club shaft has different characteristic without varying material and the quality of the material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a golf club shaft composed of a fiber reinforced resin layer.

  In recent years, many golf club shafts composed of a plurality of fiber reinforced resin (FRP) layers have been used. Such a golf club shaft is excellent in strength, has a high degree of freedom in designing weight, bending rigidity, kick point, and the like, and can provide a golf club shaft that widely meets the needs of players.

  Carbon fibers are mainly used as the reinforcing fibers, and various golf club shafts combining carbon fibers having different elastic moduli have been developed.

  For example, in Patent Document 1, as a golf club shaft, a fiber having an elastic modulus of 200 to 1000 GPa, preferably a bias layer made of carbon fiber, or a bias layer and a straight layer made of carbon fiber, and an elastic modulus of 5 are used. What combined with the straight layer which consists of carbon fiber which is -150GPa is disclosed.

JP-A-9-277389

  By the way, in the case of an iron club, there are a number of counts such as long iron (No. 4 to 6), middle iron (No. 7 to 9), short iron (PW, AW, SW). Strength is required.

  In this case, in order to provide desired characteristics for each count, the material of the golf club shaft may be changed for each count. However, an operation of selecting a suitable material for each count and manufacturing a golf club shaft is an extremely troublesome operation that requires experience. Moreover, if the materials are different for each count, for example, the difference in characteristics between the counts may cause a decrease in feeling.

  An object of the present invention is to provide a golf club shaft capable of easily creating different golf club shafts having desired characteristics and obtaining a feeling of unity between different golf club shafts. To do.

The golf club shaft of the present invention is a golf club shaft composed of a fiber reinforced resin layer.
The first to third fiber reinforced resin layers including fibers whose orientation directions are set substantially parallel to the shaft axis and different in elastic modulus are provided, and the first to third fiber reinforced resin layers are laminated in a predetermined order. It is characterized by providing.

  In this case, a golf club having a large flight distance suitable for a long iron by disposing the first to third fiber reinforced resin layers so that the elastic modulus gradually increases from the inner peripheral portion to the outer peripheral portion. A shaft can be provided.

  In addition, by arranging the first to third fiber reinforced resin layers so that the elastic modulus gradually decreases from the inner peripheral portion to the outer peripheral portion, a golf club having a good shot feeling suitable for a short iron. A shaft can be provided.

  Furthermore, a golf club shaft suitable for a middle iron is provided by disposing the first to third fiber reinforced resin layers so that the elastic modulus of the intermediate portion is larger than the elastic modulus of the inner peripheral portion and the outer peripheral portion. can do.

  According to the present invention, the first to third fiber reinforced resin layers including fibers whose orientation directions are set substantially parallel to the shaft axis and have different elastic moduli are arranged in a predetermined order, and thus have desired characteristics. A golf club shaft applicable to an iron club can be easily obtained.

  In addition, since a plurality of golf club shafts having different characteristics can be manufactured using the first to third fiber reinforced resin layers made of the same material, for example, a plurality of iron clubs having a plurality of counts can be formed from these golf club shafts. When manufactured, a good feeling can be obtained between golf clubs.

  FIG. 1 shows an iron golf club 12 using the golf club shaft 10 of the present embodiment. The golf club shaft 10 is configured to be gradually reduced in diameter from the grip 14 side to the head 16 side.

  As shown in FIG. 2, the golf club shaft 10 is formed by winding prepreg sheets 20, 22, 24, 25, 26, 28, and 30 made of fiber reinforced resin in order from the inside around a mandrel 18 formed in a tapered shape. It is manufactured by a so-called sheet winding method in which the mandrel 18 is taken out and subjected to a finishing process after being rotated and heat-cured. Note that the prepreg sheets 20, 22, 24, 25, 26, 28, and 30 are formed by impregnating a reinforcing fiber such as carbon fiber or glass fiber with a thermosetting resin such as an epoxy resin.

  In the prepreg sheet 20, the orientation direction of the reinforcing fibers 20 a is inclined to + 45 ° with respect to the axis of the golf club shaft 10, and the two-ply bias layer is formed by being wound twice around the outer periphery of the mandrel 18. Form.

  In the prepreg sheet 22, the orientation direction of the reinforcing fibers 22 a is inclined by −45 ° with respect to the axis of the golf club shaft 10, and the prepreg sheet 22 is wound twice on the prepreg sheet 20 wound around the outer periphery of the mandrel 18. As a result, a two-ply bias layer is formed.

  In addition, as the reinforcing fibers 20a and 22a of the prepreg sheets 20 and 22, carbon fibers (elastic modulus is 200 GPa or more) are used.

  The prepreg sheets 24, 25, and 26 have the orientation directions of the reinforcing fibers 24 a, 25 a, and 26 a set in the axial direction of the golf club shaft 10, and the prepreg sheets 24, 25, and 26 are respectively arranged in a predetermined order on the wound prepreg sheet 22. By winding twice, each constitutes a two-ply straight layer (first to third fiber reinforced resin layers).

  In addition, as each reinforced fiber 24a, 25a, and 26a of each prepreg sheet 24, 25, and 26, the glass fiber (reinforced fiber 24a) and carbon fiber (reinforced fiber 25a, 26a) which have mutually different elastic modulus are used.

  The prepreg sheet 28 is made of carbon fiber reinforced resin (CFRP), the orientation direction of the reinforced fibers 28 a is set in the axial direction of the golf club shaft 10, and is the outermost layer of the wound prepreg sheet 24, 25, or 26. By being wound once, a one-ply reinforcing layer is formed in a range 34 on the head 16 side of the golf club shaft 10 shown in FIG.

  The prepreg sheet 30 is made of carbon fiber reinforced resin (CFRP), the orientation direction of the reinforced fibers 30a is set in the axial direction of the golf club shaft 10, and is wound four times on the wound prepreg sheet 28. Thus, a four-ply reinforcing layer is formed in a range 36 on the head 16 side of the golf club shaft 10 shown in FIG.

  Note that only one of the reinforcing layers of the prepreg sheets 28 and 30 may be provided.

  3 to 5 show schematic cross sections of a golf club shaft 10 manufactured using the prepreg sheets 20, 22, 24, 25, 26, 28 and 30 configured as described above. 3 shows a golf club shaft 10 in which a bias layer composed of prepreg sheets 20 and 22 and a straight layer composed of prepreg sheets 24, 25 and 26 are arranged in this order from the inside, and FIG. The golf club shaft 10 in which a bias layer made up of 22 and a straight layer made up of prepreg sheets 24, 26 and 25 are arranged in order, FIG. 1 shows a golf club shaft 10 in which straight layers of 25 and 24 are arranged in order. The elastic modulus is assumed to increase in the order of the prepreg sheets 24, 25, and 26.

  As shown in FIG. 3, when the arrangement order of the prepreg sheets 24, 25, and 26 is set so that the elastic modulus gradually increases from the inner peripheral portion to the outer peripheral portion of the golf club shaft 10, The shaft 10 is easily bent. Accordingly, when the iron golf club 12 is manufactured from the golf club shaft 10 having such a configuration, a long iron having a large flight distance can be obtained.

  As shown in FIG. 4, when the arrangement order of the prepreg sheets 24, 25, and 26 is set so that the elastic modulus of the intermediate portion is larger than the elastic modulus of the inner peripheral portion and the outer peripheral portion of the golf club shaft 10, A golf club shaft 10 suitable for a middle iron having intermediate characteristics between a long iron and a short iron can be obtained. In this case, the arrangement order of the prepreg sheets 24, 25, and 26 may be set so that the elastic modulus of the intermediate portion is smaller than the elastic modulus of the inner peripheral portion and the outer peripheral portion.

  As shown in FIG. 5, when the arrangement order of the prepreg sheets 24, 25, and 26 is set so that the elastic modulus gradually decreases from the inner periphery to the outer periphery of the golf club shaft 10, The strength of the shaft 10 increases. Therefore, when the iron golf club 12 is manufactured from the golf club shaft 10 having such a configuration, a short iron having a good shot feeling can be obtained.

  As described above, the iron golf club 12 having the characteristics suitable for the desired count is manufactured by changing the arrangement order of the prepreg sheets 24, 25 and 26 without changing the material and the material constituting the golf club shaft 10. can do. And since the material itself of the golf club shaft 10 is comprised from the same thing, there is no sense of incongruity between the shafts by the difference in material, and the set of the iron golf club 12 with a high unity feeling can be provided.

  Table 1 shows Examples 1 to 3 of the golf club shaft of the present invention. The bias layer is formed from the prepreg sheets 20 and 22, the straight layer A is formed from the prepreg sheets 24, 25, or 26 disposed on the inner peripheral portion, and the straight layer B is disposed on the intermediate portion. The straight layer C is formed from the prepreg sheets 24, 25, or 26 disposed on the outer peripheral portion. The reinforcing layers D and E are formed from the prepreg sheets 28 and 30.

  Table 2 shows that an iron golf club 12 using the golf club shaft 10 having the configuration of Example 1 and an iron golf club 12 using the golf club shaft 10 having the configuration of Example 3 are used by three testers. The result of the trial hit is shown. FIG. 6 shows the results of measuring the vibration characteristics of the iron golf club 12 of Example 1 and the iron golf club 12 of Example 3 using a putter robot by a pendulum test (down angle 45 °). .

  In this case, in any of the testers, a result that the flight distance is increased in the golf club shaft 10 of the first embodiment than in the golf club shaft 10 of the third embodiment is obtained. In terms of vibration characteristics, the golf club shaft 10 of the third embodiment has a smaller acceleration fluctuation range than the golf club shaft 10 of the first embodiment, and it is expected that the iron golf club 12 having a good shot feeling can be obtained. .

It is an iron golf club using the golf club shaft of this embodiment. It is explanatory drawing of each prepreg sheet | seat which comprises the golf club shaft of this embodiment. It is the III-III sectional view taken on the line of the golf club shaft used for a long iron in FIG. It is the IV-IV sectional view taken on the line of the golf club shaft used for a middle iron shown in FIG. It is the VV sectional view taken on the line of the golf club shaft used for a short iron in FIG. It is explanatory drawing of the vibration characteristic of the long iron using the golf club shaft of this embodiment, and a short iron.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Golf club shaft 12 ... Iron golf club 20, 22, 24, 25, 26, 28, 30 ... Prepreg sheet

Claims (4)

In a golf club shaft composed of a fiber reinforced resin layer,
The first to third fiber reinforced resin layers including fibers whose orientation directions are set substantially parallel to the shaft axis and different in elastic modulus are provided, and the first to third fiber reinforced resin layers are laminated in a predetermined order. A golf club shaft characterized by being provided. The golf club shaft according to claim 1,
A golf club shaft, wherein the first to third fiber reinforced resin layers are disposed so that an elastic modulus gradually increases from an inner peripheral portion to an outer peripheral portion. The golf club shaft according to claim 1,
A golf club shaft, wherein the first to third fiber reinforced resin layers are disposed so that an elastic modulus gradually decreases from an inner peripheral portion to an outer peripheral portion. The golf club shaft according to claim 1,
A golf club shaft, wherein the first to third fiber reinforced resin layers are disposed so that an elastic modulus of an intermediate portion is larger than an elastic modulus of an inner peripheral portion and an outer peripheral portion.

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