JP2006230573A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head which enables the relatively free setting of the center of gravity position of the head even in a growing size of the head and moreover, achieves better ball hitting touches and sounds in the hitting of golf balls. <P>SOLUTION: The golf club head comprises a body part 14 integrally molded with a hosel 12, a sole part 16 joined on the bottom surface of the body part 14 and an inner wall member 18 joined on the inner peripheral surface of the body part 14. The body part 14 is made of a metallic material and the inner wall member 18 is made of a resin material with its specific gravity smaller than that of the metallic material of the body part 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a golf club head having a hollow interior, and more particularly to a wood-type golf club head.

  For example, in a wood type golf club head, it is necessary to set the center of gravity of the head to an appropriate height in order to increase the launch angle of the ball and increase the flight distance. On the other hand, recently, a head having a large size has been created in order to enlarge the sweet area and stabilize the directionality of the hit ball.

  In this case, the thickness of the head is made as thin as possible to suppress the increase in weight due to the increase in size of the head, and a weight member is attached to adjust the position of the center of gravity. It has become difficult to change. In view of this, a structure in which a part of the head is made of a material having a specific gravity smaller than that of a metal material has been proposed.

  For example, in Patent Documents 1 and 2, the face portion and the vicinity thereof are formed of a metal material (for example, titanium alloy, stainless steel, maraging steel, etc.), and the remaining portion is a composite material or fiber having a specific gravity smaller than that of the metal material. It is made of reinforced resin material. In this case, the weight can be used for adjusting the position of the center of gravity of the head, since the weight can be reduced by using a material having a small specific gravity.

  Further, in Patent Document 3, a hole is formed in the central portion of the crown portion of the head main body molded from a metal material (titanium alloy, iron alloy, aluminum alloy, etc.), and the specific gravity in the hole is higher than that of the head main body. A cover member made of a small material is attached, and the inner surface of the face portion is reinforced with a fiber reinforced plastic material. With this configuration, it is possible to reduce the thickness of the face portion made of metal, increase the depth of the center of gravity of the head, and expand the sweet area.

JP 2003-62130 A JP 2003-144590 A JP 2003-250933 A

  However, in Patent Documents 1 and 2, in order to maintain the durability of the head, it is necessary to secure a sufficient bonding strength between the face portion and the portion constituting the vicinity thereof and the remaining portion. It is extremely difficult to firmly connect the fiber reinforced resin material and the fiber reinforced resin material due to the characteristics of the material.

  In Patent Document 3, a lightweight cover member is attached to the central portion of the crown portion for the purpose of weight reduction. However, in order to improve the appearance of the head, the edge portion of the cover member is polished. Etc., an extremely complicated process is required.

  The present invention has been made in view of the above problems, and even when the head is enlarged, the center of gravity position of the head can be freely set, and when the golf ball is hit An object of the present invention is to provide a golf club head capable of obtaining a good shot feeling and hitting sound.

The present invention provides a golf club head having a hollow interior,
An outer wall member in which a face part, at least a part on the face part side of a crown part, and at least a part on the face part side of a side part are formed of a metal material;
An inner wall member joined to the inner surface of the outer wall member and formed of a resin material having a specific gravity smaller than that of the metal material;
It is comprised from these.

  With this configuration, the outer wall member of the face part, the outer wall member of the crown part at least on the face part side, and the outer wall member of the side part at least on the face part side are made of a lightweight material. Therefore, the thickness of the outer wall member made of a metal material having a large specific gravity can be reduced, and the golf club head can be reduced in weight and the center of gravity can be easily adjusted.

In the present invention, the outer wall member includes a body portion in which the face portion, the crown portion, and the side portion are integrally formed and an opening portion is formed on a bottom surface, and a metal material that is joined to the opening portion. The sole part is formed and
The inner wall member is formed of a fiber reinforced resin material bonded to at least the face portion, the crown portion, and the side portion of the outer wall member.

  Since the inner wall member made of the fiber reinforced resin material is covered with the outer wall member, it can be formed without requiring a post-processing step. The sole part is formed of a metal material, and is heavier than the crown part and the side part, so that the position of the center of gravity can be easily set low.

In the present invention, an average thickness of the outer wall member constituting the face portion is 0.7 mm or more and 2.0 mm or less,
The average wall thickness of the inner wall member constituting the face portion is 0.5 mm or more and 5.0 mm or less,
Average wall thickness of the outer wall member constituting the crown part and the side part is 0.15 mm or more, 0.5 mm or less,
Average wall thickness of the inner wall member constituting the crown part and the side part is 0.1 mm or more, 3.0 mm or less,
It is characterized by being set to.

  If the average wall thickness of the outer wall member of the face portion exceeds 2.0 mm, it is difficult to ensure a sufficient weight margin. The same applies to the case where the average thickness of the outer wall member of the crown part and the side part exceeds 0.5 mm. Further, if the average thickness of the inner wall member of the face portion exceeds 5.0 mm, it is difficult to obtain a good shot feeling and hitting sound. The same applies to the case where the average thickness of the inner wall members of the crown part and the side part exceeds 3.0 mm.

  The average thickness of the outer wall member and the inner wall member of the face portion, crown portion, and side portion is preferably an average thickness of the outer wall member of the face portion of 0.8 to 1.8 mm, and the average thickness of the inner wall member of the face portion. 0.6 to 3.5 mm, the average thickness of the outer wall portion of the crown portion and the side portion is 0.2 to 0.4 mm, and the average thickness of the inner wall portion of the crown portion and the side portion is 0.2 to 2 .5 mm. Furthermore, the average thickness of the face portion that combines the outer wall portion and the inner wall portion is preferably set to 1.5 mm or more, and the average thickness of the crown portion and the side portion that combines the outer wall portion and the inner wall portion. Is preferably set to 0.5 mm or more.

  Further, according to the present invention, the inner wall member made of the fiber reinforced resin material is applied with an adhesive on the inner surface of the outer wall member made of a metal material, and the fiber reinforced resin prepreg material is attached and heated, and inserted into the hollow portion, for example. By inflating and pressurizing the airbag, the fiber-reinforced resin prepreg material can be cured and simultaneously pressed against the inner surface of the outer wall member.

  The opening formed on the bottom surface of the main body can be formed leaving a portion constituting the periphery of the sole portion joined to the opening. At the same time that the inner wall member is disposed on the inner surface of the outer wall member, the opening of the main body can be closed by joining the sole to the edge of the opening with an adhesive. In such a joining method of the main body portion and the sole portion, the joining is not particularly difficult, and a sufficient joining strength can be obtained.

  According to the golf club head of the present invention, since the outer wall member made of a metal material is reinforced by a lightweight resin material, even when the golf club head is configured in a large size, it is lightweight while maintaining sufficient strength. And the center of gravity can be adjusted appropriately and easily.

  FIG. 1 is an exploded perspective view of the golf club head 10 of this embodiment, and FIG. 2 is a cross-sectional view of the golf club head 10. The golf club head 10 is basically composed of a main body portion 14 integrally formed with the hosel 12, a sole portion 16 joined to the bottom surface of the main body portion 14, and an inner wall member 18 joined to the inner peripheral surface of the main body portion 14. Configured. The main body portion 14 and the sole portion 16 constitute an outer wall member of the golf club head 10.

  The main body portion 14 has an internal hollow portion 20, and includes a face portion 22 that is a ball striking surface, a crown portion 24, a side portion 26, and an opening portion 28 that is closed when the sole portion 16 is joined. . The main body portion 14 and the sole portion 16 are formed from a metal material such as stainless steel, maraging steel, high-tensile steel, or titanium alloy.

  The inner wall member 18 is formed from a fiber reinforced resin material. The fiber reinforced resin material uses carbon fiber, glass fiber, aramid fiber, etc. as the reinforcing fiber, and as the resin, thermosetting resin such as epoxy resin, vinyl ester resin, polyamide resin, polyether ketone resin, polyphenylene sulfide resin, The thing using thermoplastic resins, such as a polyimide resin and a polyamideimide resin, is illustrated. In the present embodiment, the inner wall member 18 is formed from a fiber reinforced resin material. However, the inner wall member 18 may be formed from only a resin without using reinforcing fibers.

  The main body portion 14 can be manufactured by, for example, casting and then polishing, but it is necessary to form a very thin wall, and it is difficult to polish with high accuracy by a normal method. It is desirable to do so. The average thickness of the face portion 22 is 0.7 mm or more and 2.0 mm or less, preferably 0.8 to 1.8 mm. The average thickness of the crown part 24 and the side part 26 is 0.15 mm or more and 0.5 mm or less, preferably 0.2 to 0.4 mm. In addition, although it is set as average thickness about thickness, it may be uniform and may be changed partially.

  For example, the inner wall member 18 is inserted into the inner hollow portion 20 after a sheet-like prepreg material using carbon fiber and epoxy resin is inserted from the opening 28 and attached to the inner surface of the main body 14 previously coated with an adhesive. The air bag is introduced into the air bag, and heat-cured in a pressurized state, whereby it can be pressure-bonded. The average wall thickness of the inner wall member 18 on the face portion 22 side is 0.5 mm or more and 5.0 mm or less, preferably 0.6 to 3.5 mm. The average wall thickness of the inner wall member 18 on the side of the crown part 24 and the side part 26 is 0.1 mm or more and 3.0 mm or less, preferably 0.2 to 2.5 mm. The inner wall member 18 on the face part 22 side and the inner wall member 18 on the crown part 24 and side part 26 side may have the same thickness or different thicknesses. In the case of different thicknesses, for example, the number of prepreg materials constituting the inner wall member 18 may be varied depending on the part. Further, the inner wall member 18 on the face portion 22 side and the inner wall member 18 on the crown portion 24 and side portion 26 side may be formed of different types or configurations of fiber reinforced resin materials.

  The sole portion 16 can be manufactured from a metal material such as stainless steel, maraging steel, high-tensile steel, or titanium alloy by a method such as casting, forging, or press molding. The metal material constituting the sole portion 16 may be the same as or different from the metal material constituting the main body portion 14.

  The golf club head 10 can be manufactured by joining the main body portion 14 and the sole portion 16 to each other at the same time as the inner wall member 18 is formed. Since the joining of the main body part 14 and the sole part 16 is joining of metal materials, they can be joined by laser welding or the like.

  As an example, a golf club head 10 for a driver using high strength steel for the main body portion 14 and the sole portion 16 and a carbon fiber reinforced resin for the inner wall member 18 was manufactured. This golf club head 10 has a volume of 400 ml and a weight of 195 g, an average thickness of the main body portion 14 constituting the face portion 22 is 1.0 mm, and an average thickness of the main body portion 14 constituting the crown portion 24 and the side portion 26. Is formed to 0.25 mm. The average thickness of the inner wall member 18 in the face part 22, the crown part 24 and the side part 26 is 0.7 mm, and the average thickness of the main body part 14 constituting the sole part 16 is 1.0 mm. Further, the golf club head 10 had a center of gravity height of 34.3 mm and a center of gravity depth of 34.5 mm.

  As a comparative example, a golf club head having a volume of 400 ml was produced from high tensile strength steel without forming the inner wall member 18. The golf club head of this comparative example had an average thickness of 2.2 mm for the face portion 22, an average thickness of 0.5 mm for the crown portion 24 and the side portion 26, an average thickness of 1.0 mm for the sole portion 16, and a weight of 226 g. It was. The golf club head of the comparative example had a center of gravity height of 35.4 mm and a center of gravity depth of 29.9 mm.

  The golf club head 10 of the example can reduce the weight by 41 g as compared with the golf club head of the comparative example, and the result that the center of gravity height is 1.1 mm lower and the center of gravity depth can be increased by 4.6 mm is obtained. It was.

It is a disassembled perspective block diagram of the golf club head of this embodiment. It is a section lineblock diagram of a golf club head of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Golf club head 14 ... Main-body part 16 ... Sole part 18 ... Inner wall member 20 ... Internal hollow part 22 ... Face part 24 ... Crown part 26 ... Side part 28 ... Opening part

Claims (4)

In the golf club head configured to be hollow inside,
An outer wall member in which a face part, at least a part on the face part side of a crown part, and at least a part on the face part side of a side part are formed of a metal material;
An inner wall member joined to the inner surface of the outer wall member and formed of a resin material having a specific gravity smaller than that of the metal material;
A golf club head comprising: The golf club head according to claim 1,
The outer wall member includes a body portion in which the face portion, the crown portion, and the side portion are integrally formed, and an opening portion is formed on a bottom surface, and a sole portion that is formed from a metal material joined to the opening portion. Consisting of
The golf club head according to claim 1, wherein the inner wall member is formed of a fiber reinforced resin material bonded to at least the face portion, the crown portion, and the side portions of the outer wall member. The golf club head according to claim 2, wherein
An average thickness of the outer wall member constituting the face portion is 0.7 mm or more and 2.0 mm or less,
The average wall thickness of the inner wall member constituting the face portion is 0.5 mm or more and 5.0 mm or less,
Average wall thickness of the outer wall member constituting the crown part and the side part is 0.15 mm or more, 0.5 mm or less,
Average wall thickness of the inner wall member constituting the crown part and the side part is 0.1 mm or more, 3.0 mm or less,
A golf club head characterized by being set to. The golf club head according to claim 2, wherein
The golf club head according to claim 1, wherein the inner wall member is formed of a fiber reinforced resin prepreg material that is heated and pressed on an inner surface of the outer wall member and bonded with an adhesive.

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