JP4079645B2 - Hollow golf club head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a golf club head having a hollow structure, and more specifically, by combining different materials as constituent materials of the face portion, the resilience can be increased as compared with the case of being composed of only a single metal material. The present invention relates to a hollow golf club head having a large degree of design freedom.
[0002]
[Prior art]
Metal hollow golf club heads generally have a low center of gravity by increasing the weight distribution to the sole portion. However, in recent years, it has been required to increase the head volume as much as possible within the limited head mass, so the weight margin for realizing a low center of gravity has been narrowed, and the degree of freedom in design has been reduced. . For this reason, the head has a low center of gravity and a deep center of gravity are insufficient. Further, the conventional hollow golf club head has a disadvantage that the repulsive force of the face surface cannot be fully utilized.
[0003]
By the way, Japanese Patent No. 3007840 discloses a hollow golf club head in which a plurality of plate members are arranged on a face portion and only a peripheral portion of these plate members is coupled to a head body. In this hollow golf club head, since a plurality of plate members can be slidably displaced with each other, the amount of bending of the face portion can be reduced by thinning each plate member while ensuring strength based on the total thickness of the plurality of plate members. It is possible to increase the resilience by increasing the size. However, the golf club head in which a plurality of plate members are arranged on the face portion as described above is accompanied by an increase in weight, so that the weight margin becomes narrow and the degree of freedom in design becomes small. For this reason, it has been difficult to achieve a low center of gravity and a deep center of gravity of the head. Further, the resilience of the head was insufficient.
[0004]
[Problems to be solved by the invention]
The object of the present invention is to combine different kinds of materials as the constituent material of the face portion, thereby enabling higher resilience and greater design freedom than a case of being composed of only a single metal material. An object of the present invention is to provide a hollow golf club head.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a hollow golf club head according to the present invention is a hollow golf club head in which two plate members are superposed on a face portion, and only the peripheral portion of these plate members is coupled to a head body. The two plate members are made of metal, and the reinforcing members made of fiber reinforced plastic are formed on the opposing surfaces of the two plate members. The thickness of the reinforcing material made of the fiber-reinforced plastic is gradually increased from the peripheral part toward the central part.
[0006]
In this way, in the hollow golf club head in which a plurality of plate members are arranged on the face portion, the face portion is reduced in weight by combining metal and fiber reinforced plastic as the constituent material of the face portion, so that a larger weight margin is provided. Can be secured. Therefore, the degree of freedom in design is increased compared to the case where only a single metal material is used, and as a result, the center of gravity and the center of gravity of the head can be lowered. In addition, since multiple plates can slide and displace relative to each other, the amount of flexure of the face portion can be increased by making each plate thinner while ensuring strength based on the total thickness of the multiple plates. It is also possible to increase.
[0007]
As the metal, two or more metals can be used in combination. As the fiber reinforced plastic, two or more kinds of fiber reinforced plastics can be used in combination. As fiber-reinforced plastics, those elastic modulus of the fiber is a thing or 27ton / mm ² or more is less than 27ton / mm ² and suitably selected according to the position of the face portion, the rigidity of the face peripheral portion the rigidity of the face center portion If the height is higher than the above value, the face portion can be easily bent, and the resilience can be further increased.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0009]
FIG 1 (a) ~ (c) shows a golf club head according to an embodiment of the present invention. As shown in FIG. 1 (a) ~ (c) , the golf club head of this embodiment has a hollow structure, the plurality of plate members 2, 2 are disposed in a stacked state in the face portion of the head body 1 ing. Only the peripheral part of these plate members 2 and 2 is integrally coupled to the head main body 1. The plate members 2 and 2 are made of metal in the same manner as the portion other than the face portion of the head main body 1, and a reinforcing member 3 made of fiber reinforced plastic is bonded to the opposite surface. In this case, the thickness of the reinforcing member 3 is gradually increased from the peripheral side to the central side of the face portion, and as a result, the central portion of the face has high rigidity and the peripheral portion of the face has low rigidity. Further, with the addition of the reinforcing material 3, the thickness of the plate material 2 on which the reinforcing material 3 is laminated is made thinner than before.
[0010]
In the embodiment described above, since the face portion of the head body 1 is made of a composite material of metal and fiber reinforced plastic, the mass of the face portion can be reduced and a larger weight margin can be secured. Therefore, the degree of freedom in design is increased compared to the case where only a single metal material is used, and as a result, the center of gravity and the center of gravity of the head can be lowered. In addition, if the physical properties of the fiber reinforced plus chip are appropriately selected and the face central portion is made to have high rigidity and the face peripheral portion is made to have low rigidity, the face portion can be easily bent and the resilience can be further increased.
[0011]
In the above-described embodiment , when the ball collides with the face portion of the head body 1 and the plurality of plate members 2 and 2 are bent, the plate members 2 and 2 can be slidably displaced from each other. Here, since the breaking strength of the face portion is proportional to the total thickness (including the reinforcing material 3) of the plurality of plate members 2 and 2, it is possible to set a sufficient strength based on the total thickness. is there. On the other hand, the amount of bending of the face portion increases as the plate materials 2 and 2 become thinner. Therefore, when the face portion is formed by superimposing a plurality of plate members 2 and 2 as described above, it is possible to improve resilience while ensuring sufficient strength. Therefore, the resilience can be dramatically improved by a synergistic effect with the resilience improving effect based on the composite material.
[0012]
Examples of the fiber reinforced plastic include a fiber reinforced plastic obtained by impregnating a matrix fiber such as an epoxy resin, an unsaturated polyester resin, or a vinyl ester resin into a reinforced fiber such as carbon fiber, glass fiber, or aramid fiber. Particularly preferred are carbon fiber reinforced fibers. Moreover, as said metal, a titanium alloy, an aluminum alloy, stainless steel, etc. can be used individually or in combination.
[0013]
【Example】
In hollow golf club head, Comparative Examples face portion consists of a single metal material 1 (conventional example), Example 1, the face portion is made of a composite material of metal and fiber-reinforced plastics were produced. In Table 1, “FRP” means fiber reinforced plastic, “less than 27 t” means that the elastic modulus of the fiber is less than 27 ton / mm ² , and “more than 27 t” means that the elastic modulus of the fiber is 27 ton / mm Means ² or more.
[0014]
For these golf club heads, the coefficient of restitution and the degree of design freedom were evaluated, and the results are also shown in Table 1. The evaluation results are shown as an index with Comparative Example 1 as 100. The coefficient of restitution means that the larger the index value, the greater the initial ball speed and the greater the flight distance. The degree of design freedom is a weight margin when the total mass of the head is constant, and means that the weight margin is larger as the index value is larger.
[0015]
[Table 1]
As can be seen from Table 1, the golf club head of example 1, compared with Comparative Example 1, design flexibility is large, were those large coefficient of restitution.
[0016]
【The invention's effect】
As described above, according to the present invention, in the hollow golf club head in which two plate members are arranged on the face portion and only the peripheral portions of these plate members are coupled to the head main body, the peripheral portions of the two plate members. A structure in which the upper and lower ends of the face part are in contact with each other, the two plate members are made of metal, and a reinforcing material made of fiber reinforced plastic is bonded to the opposite surface of these plate members, and the fiber reinforced plastic is used. Since the thickness of the reinforcing material is gradually increased from the peripheral part toward the central part, the resilience can be increased and the degree of design freedom can be increased as compared with the case of only a single metal material. .
[Brief description of the drawings]
FIG. 1 shows a golf club head according to an embodiment of the present invention, in which (a) is a plan view, (b) is a front view, and (c) is a cross-sectional view taken along line VV.
[Explanation of symbols]
1 Head body 2 Plate material 3 Reinforcing material

Claims (5)

  In a hollow golf club head in which two plate materials are arranged on the face portion and only the peripheral portions of these plate materials are connected to the head body, the peripheral portions of the two plate materials are arranged at the upper and lower ends of the face portion. The two plate members are made of metal, and a reinforcing material made of fiber reinforced plastic is bonded to the opposing surfaces of these plate materials, and the thickness of the reinforcing material made of fiber reinforced plastic is set to the periphery. A hollow golf club head characterized by being gradually thickened from the center toward the center. The hollow golf club head according to claim 1 , wherein two or more metals are used in combination as the metal. The hollow golf club head according to claim 1 , wherein two or more kinds of fiber reinforced plastics are used in combination as the fiber reinforced plastics. ^2. The hollow golf club head according to claim 1 , wherein the fiber reinforced plastic has an elastic modulus of less than 27 ton / mm < ² >. ^2. The hollow golf club head according to claim 1 , wherein the fiber reinforced plastic has an elastic modulus of 27 ton / mm ² or more.