JP4760320B2 - Golf club head and golf club - Google Patents

Description

  The present invention relates to a golf club head having a hollow structure, and more particularly to a golf club head configured by joining a head body and a face body, and a golf club including the golf club head.

  Conventionally, a metal hollow golf club head is manufactured by molding a metal plate into an outer shell structure. Metal plate forming methods are roughly classified into forging and casting. The forging molding method (forging molding) is less prone to defects during molding than the casting molding method (casting molding), and the metal plate can be made thinner and lighter. For this reason, a golf club head can be reduced in weight and a mass margin can be taken large. Moreover, rigidity etc. can be reduced significantly by making the metal plate sufficiently thin. However, in forging molding, the degree of freedom of change in shape and thickness is poor compared to casting molding, and the adjustment range of the center of gravity position of the golf club head is relatively small. Therefore, conventionally, in a golf club head manufactured by forging, a low center of gravity of the golf club head has been achieved by adjusting the position of the center of gravity by welding a metal lump to the sole portion. For this reason, when a golf club head is produced only by forging, it is difficult to change the thickness or finely adjust the position of the center of gravity of the golf club head.

  On the other hand, casting molding has a greater degree of freedom in changing the shape and thickness of the metal plate than forging molding, and the center of gravity can be adjusted within a relatively large range. However, casting molding is relatively fragile because fine cavities may be formed inside the molded metal layer. For this reason, it is difficult to reduce the thickness and weight of the metal plate. Therefore, it is difficult to reduce the weight of the golf club head and increase the mass margin. Moreover, it has been impossible to reduce the rigidity greatly by thinning the metal plate sufficiently.

  Thus, forging molding and casting molding have advantages and disadvantages, respectively. For this reason, for example, when a golf club head is manufactured from a single metal plate, there is a problem that the degree of freedom in changing the shape and thickness is insufficient only by forging and the adjustment range of the center of gravity is relatively small. Further, it is difficult to reduce the thickness to a certain extent only by casting, and there is a limit to reducing the weight and rigidity of the golf club head. Various proposals have been made for golf club heads made by combining cast and forged metal plates to eliminate the disadvantages of golf club heads due to differences in the metal plate molding methods. Has been.

  For example, the following Patent Document 1 is a hollow type golf club head, which is cast and formed by forging or pressing, with a head main body portion formed with an opening for opening the hollow portion upward on the upper surface thereof. In addition, a golf club head is disclosed that includes a lid portion that is disposed so as to close the opening of the main body portion and whose peripheral portion is welded and fixed to the opening portion of the main body portion. In the golf club head described in Patent Document 1, since the lid portion fixed to the opening of the head body is molded by forging or pressing, the thickness thereof can be reduced. It is possible to suppress the occurrence of defects due to pinholes.

  Further, for example, Patent Document 2 below discloses a hollow golf club head in which the elastic modulus of the metal material constituting the crown portion is the lowest. In the golf club head described in Patent Document 2, the elastic modulus of the crown portion is made smaller than that of other members such as a sole portion. In the golf club head described in Patent Document 2, the crown portion is deformed at the time of impact by making the elastic modulus of the crown portion smaller than that of other members such as the sole portion. This deformation increases the launch angle of the golf ball and improves the flight distance of the ball. In the golf club head described in Patent Document 2, a metal layer that has been pressed (rolled) is used for the crown portion. In the golf club head described in Patent Document 2, the titanium alloy used as the crown portion is pressed (rolled) so that the thickness of the crown portion is smaller than that of the side portion and the sole portion. The rate is relatively small. Thereby, it is set as the structure which a crown part can change easily in the case of an impact. In addition, a complicated shape can be precisely formed by integrally casting the sole portion, the side portion, and the hosel portion.

JP 7-148289 A JP 2003-79768 A

  However, in each of the golf club heads described in Patent Document 1 and Patent Document 2, a crown portion is produced by forging or rolling, and this crown portion is welded to a head main body portion including a side portion and a sole portion. Yes. However, the degree of deformation of the golf club when the golf ball is hit with the golf club is insufficient only by reducing only the bending rigidity of the crown portion. Further, in the golf club heads described in Patent Document 1 and Patent Document 2, the crown portion is welded to the head main body portion, in the vicinity of the ridge line between the crown portion and the side portion, from the front end to the rear end of the golf club head. There is a weld that extends toward the end. A portion of the golf club head corresponding to the welded portion is relatively thick for welding. Further, the welded portion (the welded portion) has a relatively high elastic modulus. In the golf club heads described in Patent Document 1 and Patent Document 2, the welded portion functions as a beam, and the degree of deformation of the golf club when the golf ball is hit with the golf club is suppressed. In the golf club head described in Patent Document 1 or Patent Document 2, when the golf ball is hit with the golf club, the degree of deformation of the golf club is insufficient, so that the flight distance and feel of the golf ball are considered. It could not be improved.

  An object of the present invention is to provide a golf club head and a golf club having a hollow structure in which a golf ball has a good flight distance and feel.

In order to solve the above-mentioned problems, the present invention provides a hollow-structure golf club head having a face surface for hitting a golf ball, the substantially plate-like face body having the face surface, and the face body joined thereto. And a head body forming a crown part, a sole part, and a side part of the golf club head, and a face body and a neck body protruding from the head body, wherein the head body includes at least the crown part. And a first part forming a part of the side part, and a second part forming at least the other part of the sole part and the side part having a higher elastic modulus than the first part, said neck body, while being directly bonded to said face member, said first portion is bonded directly to the bonding end of said face member of said head body, said first portion The end portion and the end portion of the second portion is constituted by the end portion of the first portion, extending from the entire corresponding regions in the crown portion of the joining end to a region corresponding to the side portions In addition, the present invention provides a golf club head characterized in that a joining line indicating a joining portion between the first portion and the second portion in the crown portion has a gentle curve protruding rearward of the head body .

  In addition, the width in the front-rear direction of the golf club head in the region corresponding to the side portion of the first portion gradually decreases as it approaches the sole portion side from the crown portion side. Is preferred.

  The first portion is preferably made of a forged metal member, and the second portion is preferably made of a cast metal member. In this case, it is preferable that both the first part and the second part are a metal mainly composed of titanium.

  In the first portion, it is preferable that one member is continuously formed integrally from the toe side of the side portion through the crown portion to the heel side of the side portion.

  In addition, it is preferable that the width | variety of the said front-back direction of the area | region corresponding to the said side part of the said 1st part is 25%-75% of the length of the said front-back direction of the whole golf club head. In addition, the width of the golf club head in the front-rear direction of the region corresponding to the side portion of the first portion is determined from the front to the rear of the golf club head when the golf club head is installed on the ground at a normal address position. It is an interval in a direction parallel to the direction toward. More specifically, the width in the direction perpendicular to the plane perpendicular to the ground including the shaft center axis when the golf club head is installed on the ground in a normal address state.

Further, when the height from the ground of the entire golf club head in a state where the golf club head is installed on the ground at a normal address position is F, the length L in the front-rear direction of the entire golf club head, The front-rear width W ₁ of the region corresponding to the crown portion of the first portion, the front-rear direction of the region corresponding to the side portion on the toe side of the first portion at a position separated by 0.3 F from the ground The width W _{3 in the} front-rear direction of the region corresponding to the side portion on the heel side of the first portion at a position spaced apart by 0.3 F from the ground in the direction W ₂ is the following formula (1) or It is preferable to satisfy at least one of (2).
0.1 ≦ ((W ₁ / L) − (W ₂ /L))≦0.6 (1)
0.1 ≦ ((W ₁ / L) − (W ₃ /L))≦0.6 (2)

  Moreover, it is preferable that the said 1st part is 0.3-0.7 mm in thickness of the center position of the area | region corresponding to the said crown part. Here, the center position of the region corresponding to the crown portion of the first portion means that when the golf club head is installed on the ground in a normal address state, the center position of the face surface of the golf club head passes through the face. It is a point on the intersection line between the plane perpendicular to the surface and the crown-side surface of the first portion, and means the position where the intersection line is divided into two.

  Moreover, it is preferable that the distance from the said face surface of the junction part of the said 1st part and the said 2nd part is 20 mm or less. The elastic modulus of the first part is preferably 50 Gpa to 105 Gpa.

  The present invention also provides a golf club comprising the above-described golf club head.

  The golf club head and golf club of the present invention have good hitting performance such as flight distance and hit feeling.

  Hereinafter, a golf club and a golf club head of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

  FIG. 1 is an exploded perspective view showing a golf club 10 including a golf club head 20 according to the first embodiment of the present invention. As shown in FIG. 1, a golf club head 20 according to a first embodiment of the present invention is a so-called hollow golf club head, and is joined to a golf club shaft 60 to constitute a golf club 10. The golf club head 20 includes a face body 22, a head body 21, and a neck body 28. The head main body 21 includes a first part (first part) 24 and a second part (second part) 26.

  The face body 22 of the golf club head 20 corresponds to the face portion of the golf club head 20. The face body (face portion) 22 has a plate-like portion 25 whose surface forms a face surface 23, and a protruding portion 27 that protrudes from the periphery of the plate-like portion 25 toward the rear side of the golf club head 20. .

  The neck body 28 corresponds to a hosel portion of the golf club head that fixes the golf club shaft 60 to the golf club head 20. The neck body 28 is provided with an opening 29 into which the golf club shaft 60 is inserted. The golf club shaft 60 is fixed to the golf club head 20 via a socket 62. The socket 62 is provided with an opening 64 through which the golf club shaft 60 can be inserted.

  The head body 21 includes a first part (first part) 24 and a second part (second part) 26, and the joint end of the head body 21 and the face body 22 is the first part. It is composed of an end portion of (first portion) 24 and an end portion of second part (second portion) 26.

  The golf club head 20 is configured by welding the face body 22, the head body 21 (first portion 24, second portion 26), and a neck body 28. The golf club head 20 includes a face portion (face body) 22, a crown portion 32, side portions 34 (toe side portions 33, heel side portions 35, back side portions 37), a sole portion 36, and a hosel portion (neck body). The golf club head has a hollow structure having 28).

  In the present embodiment, the neck body 28 (hosel portion) is a member formed separately from the face body 22 and the head body 21, and the neck body 28 is joined to the face body 22 and the head body 21 to play golf. A club head 20 is configured. In the present invention, for example, the hosel part may be provided integrally with the head body or may be provided integrally with the face body. In the present invention, the aspect of the hosel part of the golf club head is not particularly limited.

  2A to 2D are views for explaining the golf club head 20 according to the first embodiment of the present invention. FIG. 2A is a top view of the golf club head 20 as viewed from the crown portion 32 side. FIG. 2B is a side view of the golf club head 20 as viewed from the toe side portion 33 side. FIG. 2C is a side view of the golf club head 20 as viewed from the heel side portion 35 side. FIG. 2D is a front view of the golf club head 20 as viewed from the face portion 22 side.

  The second portion 26 of the head body 21 has a hollow structure in which a portion corresponding to the front side of the golf club head 20 is opened, and the first portion 24 and the face portion 22 are joined so as to close the opening end. ing. The second portion 26 constitutes a sole portion 36 and a back side portion 37, and is joined to the first portion 24, and together with the first portion 24, the crown portion 32, the toe side portion 33, and the heel side side Part 35 is configured. The second portion 26 is a cast metal member.

  By casting the second portion 26, it is possible to form a complicated shape and thickness distribution in the back side portion 37, the sole portion 36, and the like. If the shape and thickness distribution of the second portion 26 can be finely adjusted, the position of the center of gravity of the golf club head including the second portion 26 can be adjusted with high accuracy. In the present invention, the center of gravity of the golf club head can be adjusted with high accuracy by producing the back side portion 37, the sole portion 36, etc., which are relatively complicated in shape, by casting. In addition, a logo mark of a golf club head is usually engraved on the back side portion 37, the sole portion 36, and the like corresponding to the second portion 26. In addition, the shape of such a part is particularly important in the design of a golf club head. By casting the second portion 26, the shape and thickness distribution can be finely adjusted, and the degree of freedom in engraving the logo mark and the degree of design can be made relatively large.

  The first portion 24 of the head body 21 is joined to the face portion 22, a part of the front side of the crown part 32 (the front side of the golf club head 20), a part of the front side of the toe side part 33, and A part of the front side of the heel side portion 35 is formed. The first portion 24 is made by forging a single metal plate. The first portion 24 extends from the toe side portion 33 through the crown portion 32 to the heel side portion 35. Here, the front refers to the direction in which the golf ball is hit by the golf club, and the front side of the golf club head 20 refers to the side closer to the face surface 23 of the golf club head 20. In the golf club head 20 of the present embodiment, the first portion, which is a forged metal plate, is not only the portion corresponding to the crown portion 32 but also the toe side portion 33 and the heel side portion in addition to the crown portion 32. Each of the 35 golf club heads is part of the front side of the golf club head.

  The first portion 24 joined so as to close the open end of the second portion 26 has a relatively simple shape, and can be easily formed by forging a metal plate. And forging molding can make the thickness of a metal plate relatively thin compared with casting molding. In this embodiment, by producing the first part by forging, the thickness of the first part located on the front side of the golf club head 20 of the crown part 32 and the side part 34 is reduced, and bending rigidity is increased. The value is reduced. The first portion 24 in such a position receives the force applied to the face portion 22 when the golf ball is hit with the face surface 23. Since the first portion 24 is forged and has a relatively thin wall thickness and a relatively small bending rigidity, the amount of deformation of the first portion 24 when the golf ball is hit with the face surface 23 is increased. can do. Thereby, the launch angle of the golf ball can be improved and the backspin amount of the launched golf ball can be reduced. In the golf club head of the present invention, the first portion only needs to extend to at least one of the toe side portion and the heel side portion. In order to increase the deformation amount of the first portion, to improve the launch angle of the golf ball, and to further reduce the backspin amount of the launched golf ball, the first portion has a crown portion from the toe side portion. It is preferable that it extends to the heel side part.

Also, the distance between the joining line 52 between the first part 24 and the second part 26 and the joining line 54 between the first part 24 and the face part 22, and the golf club head 20 is placed on the ground at a normal address position. In this state, if the interval in the direction parallel to the ground from the front side to the rear side of the golf club head 20 is a width W, the width W ₁ that is the maximum value of the width W in the region corresponding to the crown portion 32 is In the address state, 0.25 × L ≦ W ₁ ≦ 0.75 × L is satisfied with respect to the entire length L of the golf club head 20 parallel to the direction of the width W. More specifically, the width W is more specifically the joining line 52 in a direction perpendicular to a plane perpendicular to the ground including the shaft axis when the golf club head 20 is installed on the ground in a normal address state. This is the distance from the joining line 54. When the width W _1, which is the maximum value of the width W in the region corresponding to the crown portion 32, satisfies this range, the amount of deformation of the crown portion when the golf ball is hit is made relatively large, and the flying characteristics of the golf ball Can be improved relatively. Note that the joining line 52 between the first part 24 and the second part 26 and the joining line 54 between the first part 24 and the face part 22 are peeled off, for example, by coating a golf club head with a sandblast shot of about # 100. By processing, it can be confirmed in appearance (for example, visually).

  In this specification, setting the golf club at the normal address position means that the golf club head is installed along the lie angle and the shaft axis of the golf club is orthographically projected on the ground (reference plane); It means that the golf club head is installed so that the lines that are orthographically projected on the ground are parallel to each other. In the present specification, the definition of setting at a normal address position is the same as the definition described in detail in Japanese Patent Application No. 2004-025362, which is an application by the applicant of the present application.

  Further, in the region corresponding to the toe side portion 33 and the heel side portion 35, the width W of the first portion 24 gradually decreases as it approaches the sole portion 34 side from the crown portion 32 side. (See FIG. 2 (b) and FIG. 2 (c)). In the region corresponding to the toe side portion 33, the width W of the first portion 24 is the smallest on the sole side (see FIG. 2B). In the region corresponding to the heel side portion 35, the width W of the first portion 24 is the smallest on the sole side (see FIG. 2C).

  That is, in the golf club head 20, the joining line 52 between the first portion 24 and the second portion 26 is inclined with respect to a line substantially perpendicular to the ground when the golf club head 20 is installed on the ground at a normal address position. is doing. This inclination is an inclination in a direction approaching the face part 22 as the joining line 52 approaches the sole part 36 side from the crown part 32 side. For this reason, when the golf ball is impacted by the golf club head 20, the first portion 24 is deformed more greatly on the crown portion 32 side than on the sole portion 36 side. As a result, the launch angle of the golf ball is further improved and the backspin of the launched golf ball as compared with the case where the width W is uniform in the entire side portion (each of the toe side portion 33 and the heel side portion 35). The amount is further reduced, that is, the flight characteristics of the golf ball are further improved.

In order to further improve the launch angle of the golf ball and reduce the backspin amount of the launched golf ball, the golf club head 20 from the ground surface when the golf club head 20 is placed on the ground at a normal address position. The width W at the position of the toe side portion 33 spaced apart by 0.3 F from the ground is W ₂ , and the width at the position of the heel side portion 33 spaced apart by 0.3 F from the ground. When the W and _{W 3, ((W 1 /} L) - (W 2 / L)) is preferably a 0.1 to 0.6. _{Similarly, ((W 1 / L)} - (W 3 / L)) is preferably a 0.1 to 0.6. In the golf club head, (W ₁ / L) − (W ₂ / L) and ((W ₁ / L) − (W ₃ / L)) may be the same value or different. It may be a value.

  In the golf club head of the present invention, the width W may be uniform over the entire side portion (each of the toe side portion 33 and the heel side portion 35). Even in this case, the first portion 24 having a relatively low elastic modulus extends from the toe side portion 33 through the crown portion 32 to the heel side portion 35, and the deformation amount when hitting the golf ball is as follows. It is relatively large and the flight characteristics of the golf ball are good. In the golf club head of the present invention, in order to maintain a large deformation amount when the golf ball is launched, to improve the launch angle of the golf ball, and to further reduce the backspin amount of the launched golf ball, It is preferable that the width W of the portion 24 gradually decreases as it approaches the sole portion 34 side from the crown portion 32 side.

  The first portion 24 is formed by forging a single metal plate, and extends from the front end of the golf club head to the rear end in the vicinity of the ridge line 56 between the crown portion 32 and the side portion 34. The existing welded part does not exist. For this reason, the golf club head 20 is compared with the golf club head in which the crown portion is welded to the side portion as in the golf club head described in Patent Document 1 or Patent Document 2, that is, the crown. As compared with a golf club head in which a welded portion extending from the front end to the rear end of the golf club head exists in the vicinity of the ridge line between the portion and the side portion, the crown portion 32 is relatively easily deformed. In the case of the golf club head described in Patent Document 1 and Patent Document 2 in which the crown portion is welded and joined to the side portion, the weld portion (the golf club described above) has a relatively high rigidity. Whereas the welded portion extending from the front end to the rear end of the club head is not easily deformed, the golf club head 20 has a first portion 24 (one metal plate) that does not have a welded portion having a relatively high rigidity. This is because a member formed by forging is relatively easily deformed. As described above, the golf club head 20 has a relatively large deformation amount of the crown portion 32 (first portion 24) when the golf ball is hit, and the golf ball has good flight characteristics.

  In the golf club head of the present invention, a region corresponding to the crown portion 32 of the first portion 24 and a region corresponding to the side portion (each of the toe side side portion 33 and the heel side side portion 35) are separate members. The entire first portion 24 may be manufactured by welding and joining them together. Even in this case, the first portion 24 having a relatively low elastic modulus extends from the toe side portion 33 through the crown portion 32 to the heel side portion 35, and the deformation amount when hitting the golf ball is as follows. It is relatively large and the flight characteristics of the golf ball are good. In the golf club head of the present invention, in order to increase the deformation amount of the first portion 24 when the golf ball is hit, the first portion 24 is produced by forging a single metal plate. It is preferable.

  Moreover, it is preferable that the thickness T of the first portion 24 satisfies 0.3 mm ≦ T ≦ 0.7 mm at the center position X of the portion corresponding to the crown portion 32 of the first portion 24. When the second portion 26 is formed of a member having a higher elastic modulus than that of the first portion 24, if the thickness of the first portion 24 satisfies this range, the flight characteristics of the golf ball and the golf ball are hit. The hit feeling felt by the golfer can be made relatively good. Here, the central position X of the portion corresponding to the crown portion 32 of the first portion 24 means that when the golf club head is installed on the ground in a normal address state, it passes through the central position of the face surface of the golf club head. , A point on the line of intersection between the face surface and a plane perpendicular to the ground and the crown side surface of the first portion 24, which means a position where the line of intersection is divided into two.

  Here, in the present embodiment, the center position of the face surface 23 of the face portion 22 is perpendicular to the face surface through the center of gravity position of the golf club head measured by the method disclosed in Japanese Patent Application Laid-Open No. 2001-246023. This is the position corresponding to the intersection of the center axis and the face surface 23. Hereinafter, a method for measuring the center of the face surface 23 of the face portion 22 will be described.

  The center position of the face surface 23 of the face portion 22 (the position corresponding to the intersection of the face surface 23 with an axis that passes through the center of gravity of the golf club head and is perpendicular to the face surface) is in contact with the face surface to make the golf club head It is calculated | required by the moment-of-inertia measuring device around the axis | shaft equipped with the support part which supports this. The moment of inertia measuring device is capable of knowing the axis perpendicular to the face surface through the center of gravity of the golf club head by knowing the position on the face surface 23 where the support portion supports the golf club head in a balanced manner. is there. That is, by placing the golf club head on the support portion and finding an equilibrium position (position on the face surface) that does not fall even if the hand is released, an axis that passes through the center of gravity of the golf club head and is perpendicular to the face surface; The position corresponding to the intersection with the face surface 23 is searched.

In addition, it is preferable that a support part is a form supported with a plane or 3 or more points. Moreover, it is preferable that the area of a support part is 15 mm < ² > or less. Further, the lower limit of the area of the support portion is not particularly limited as long as the golf club head is supported. The area of the support part is indicated by the area of the plane part if it is a plane, or by the area of a figure connecting the points if it is supported by three or more points. Thus, by setting the area of the support portion within the above range, the center can be obtained more accurately. In the present embodiment, the center position of the golf club head is a position corresponding to the intersection of the axis that passes through the center of gravity of the golf club head and is perpendicular to the face surface, and the face surface 23, as specified by measurement in this way. That's it.

  When the golf club head 20 is installed on the ground in a normal address state, the edge line 58 of the face surface 23 and the joining line 54 between the first portion 24 and the face portion 22 are parallel to the width W. The distance D (see FIG. 2A) is 20 mm or less. Specifically, the distance D corresponds to a plane that passes through the center position of the face surface of the golf club head and is perpendicular to the face surface and the ground when the golf club head is placed on the ground in a normal address state. It is a distance along the line of intersection with the crown-side surface, and an upper end point 66 that is the intersection of this line of intersection and the edge line 58 of the face surface 23 (the part corresponding to the crown part), and this line of intersection The distance between the intersection point 68 and the line 54. In the golf club head 20, the edge line 58 and the joining line 54 of the face surface 23 are substantially parallel. In such a golf club head, the edge line 58 of the face surface 23 and the joining line 54 between the first portion 24 and the face portion 22 in any part of the golf club head in a direction parallel to the width W. The distance D may be substituted depending on the distance. When the edge line 58 of the face surface 23 and the joining line 54 are not substantially parallel, the distance between the upper end point 66 and the intersection point 68 may be the distance D as described above.

  In a golf club head or the like whose surface is smoothly curved from the face surface to the crown portion, the portion corresponding to the crown portion of the edge line of the face surface may not be clear. In this case, the golf club is set on the ground in a normal address state, the specified plane is moved in the direction perpendicular to the face surface from the face side of the golf club, and the specified plane is brought into contact with the golf club head. In this case, a point on the golf club that is in contact with the defined plane may be defined as the upper end point. The prescribed plane here is a plane whose angle with the ground is 45 °, and whose normal vector is included in a plane perpendicular to both the face surface and the ground. When the distance D is 20 mm or less, a golf club having sufficient flight characteristics can be obtained.

In the golf club head 20, the width W of the crown portion 32 gradually increases or decreases from the toe side to the heel side. That is, the junction line 52 between the first portion 24 and second portion 26 is a gentle curve, the maximum value W ₁ of the width W of the crown portion 32 is substantially equal to the width W on the line of intersection. In the crown portion 32, the joint line 52 includes the extreme width protruding toward the rear of the golf club or the extreme recess protruding toward the front of the golf club. W can be substituted as the width W1.

  The first portion 24 is preferably a titanium alloy. The first portion 24 is formed, for example, by forging a 15-5-3β-type titanium alloy (composition: Ti-15Mo-5Zr-3Al). As the first portion 24, a light and high-strength titanium alloy is used, and the titanium alloy is thinned by forging, so that the weight of the golf club head 20 as a whole is relatively low and the golf club is highly durable. You can get a head.

  When 15-5-3β type titanium alloy (composition: Ti-15Mo-5Zr-3Al) is used as the material of the first portion 24, the elastic modulus (Young's modulus) is about 80 to 115 Gpa. In the golf club head of the present invention, the elastic modulus (Young's modulus) of the first portion is preferably 40 GPa or more and 105 GPa or less. When the second part is formed of a member having a higher elastic modulus than the first part, if the Young's modulus of the first part 24 satisfies this range, the flight characteristics of the golf ball and the golf ball are hit. The hit feeling felt by the golfer can be made relatively good. In this specification, the elastic modulus is a value obtained by a measurement method based on JISZ2202. Also, a value similar to the above measurement method can be obtained by a known resonance method, and the value obtained by this resonance method can be used as a value of the elastic modulus.

  Suitable materials for the first portion 24 include, for example, 15-3-3-3β type titanium alloy (composition: Ti-15V-3Cr-3Sn-3Al), TVCβ type titanium alloy (composition: Ti-13V-9. 5Cr-3Al), 15-0-3β type titanium alloy (composition: Ti-15Mo-3Al), and the like.

  FIG. 3 is a schematic side view illustrating a golf club head 70 which is an example of a golf club head according to a second embodiment of the present invention. 3, the same parts as those in FIG. 2 are denoted by the same reference numerals as those in FIG. In the golf club head 70 of the second embodiment, like the golf club head 20 of the first embodiment, the joint line 52 between the first portion 24 and the second portion 26 when installed on the ground at the address position. However, it is inclined in a direction approaching the face portion 22 as it goes from the crown portion 32 side toward the sole portion 34 side.

  In the first embodiment, in the region corresponding to the toe side portion 33 and the heel side portion 35, the first portion 24 has a substantially rectangular shape. In the present invention, in the region corresponding to the toe side portion and the heel side portion, the first portion 24 has a triangular shape. That is, in the second embodiment, in the region corresponding to the toe side portion 33 and the heel side portion 35, the joint line 52 between the first portion 24 and the second portion 26 is the edge on the face surface 23 side. It is joined to the line 54. Also in the second embodiment, as in the first embodiment, when the golf ball is impacted by the golf club head 70, the first portion 24 is closer to the crown portion 32 side than the sole portion 34 side. , Deformed more greatly. Accordingly, the launch angle of the golf ball is further improved and the backspin amount of the launched golf ball is further reduced as compared with the case where the width W is uniform in the entire side portion 24, that is, the flight characteristics of the golf ball Can be further improved.

  In the golf club head 70 of the second embodiment, as shown in FIG. 3, the side portion 34 (toe side) of the first portion 24 in a state where the golf club head 70 is installed on the ground at a normal address position. The distance H from the ground of the region corresponding to the side portion 33 and the heel side side portion 35) and the height F from the ground of the entire golf club head 70 satisfy H / F ≦ 0.3. Here, the distance H from the ground of the region corresponding to the side portion 34 of the first portion 24 is the distance from the ground at the position closest to the ground of the first portion 24.

  In the said 1st Embodiment and 2nd Embodiment, the 1st part 24 is comprised by the metal plate shape-forged. In the golf club head of the present invention, it is sufficient that the elastic modulus of the first part is lower than that of the second part, and the material and manufacturing method of the first part are not particularly limited. For example, the second portion may be cast metal and the first portion may be FRP. However, the first part has a simple shape and can be easily produced by forging, and the production by forging a metal plate requires fewer man-hours and the production cost is lower than that produced by FRP. In addition, when the first portion is produced by forging, it can be firmly joined to the second portion or the face portion by welding, so that the durability of the golf club head can be made relatively high.

  According to the golf club head of the present invention, even if the coefficient of restitution of the face portion of the golf club head itself is not so high, by increasing the deformation amount of the first portion, the launch angle of the golf ball can be further improved and Further, the backspin amount of the golf ball can be further reduced. According to the golf club head of the present invention, the rebound coefficient range defined in the rebound regulation rule (SLE rule, SLE is “Spring Like Effect”, a spring-like effect) that will be fully applied from 2008 Even within, it is possible to obtain a greater flight distance and a better feel than a conventional golf club head outside the range of the restitution coefficient after the revision (a restitution coefficient higher than the standard).

  The present invention is basically as described above. Although the golf club head and golf club of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various improvements or modifications may be made without departing from the spirit of the present invention. Of course.

  Hereinafter, the results of conducting experiments on the golf club of the present invention will be specifically described in comparison with an example of a conventional golf club. In this experimental example, first, with respect to the plurality of hollow golf club heads shown in the following Table 1 (Experimental Example 1 to Experimental Example 34 and Conventional Example 1 to Conventional Example 2), hit feeling, flight distance, and durability are evaluated items. As an evaluation. Table 1 also shows the evaluation results of each item. The hit feeling and the flight distance shown in Table 1 below were evaluated using relative values with the conventional example 1 as a reference (100). The durability shown in Table 1 below is a relative value that is 100 for a golf club head that has cleared a predetermined reference value and 100 for a golf club that has not cleared the predetermined reference value. It is indicated by a numerical value.

  The golf club heads shown in Experimental Example 1 to Experimental Example 34 and Conventional Example 1 to Conventional Example 2 shown in Table 1 are all hollow golf club heads. Each of the golf club heads shown in Experimental Examples 1 to 34 is configured by joining a face body and a head main body including a first portion and a second portion.

  In this experimental example, golf club shafts for TRX-DUO M40 (trade name) manufactured by Yokohama Rubber Co., Ltd. were attached to each golf club head to produce golf clubs, and the following tests were performed. The length of this golf club is 45 inches. Further, in each test of this experimental example, a TRX (trade name) ball manufactured by Yokohama Rubber Co., Ltd. was used as the golf ball unless otherwise specified.

  The durability shown in Table 1 below is until the golf ball collides with the center part of the face part of each golf club head of the experimental example and the conventional example at a speed of 50 m / sec using an air cannon tester until it breaks. The number of hit balls was measured. The upper limit of the number of times the golf ball is collided (number of hits) is 5000. If there is no failure even after hitting 5000 times, the durability is 100, and if a failure occurs before hitting 5000 times, it will fail. Durability is indicated by the relative number of hit balls.

  Regarding the flight distance shown in Table 1 below, for each golf club of each experimental example and conventional example, a total of 100 amateur golfers and professional golfers each having a head speed in the range of 34 to 50 (m / sec) It is an average value obtained by hitting 10 balls at a time.

  The hit feeling shown in the following Table 1 was evaluated by letting a plurality of golfers hit a test. As an evaluation method, each person was given a score for the hit feeling of the experimental example and other conventional examples, and the average value was obtained. The average value is shown as a relative value with the conventional example 1 as a reference (100). The higher the value, the better the feel.

  In Table 1 above, the number of parts of the first part is the number of members constituting the first part. The number of parts in the first part is one part, which means that one part is continuously integrated from the toe side of the side part through the crown part to the heel side of the side part. It means that it is configured. In addition, the number of parts in the first part is 3 parts. The first part is composed of three parts: the toe side part of the side part, the part of the crown part, and the heel side part of the side part. It means being done. When the number of parts in the first part is 3, each part is welded.

  Each of the first portions of the golf club heads shown in Experimental Examples 1 to 33 is manufactured by forging a 15-5-3β type titanium alloy (composition: Ti-15Mo-5Zr-3Al). The golf club heads shown in Experimental Examples 1 to 34 have substantially the same outer shell shape, the length L (see FIG. 2) is 100 mm, and the height F (see FIGS. 2 and 3). Is 60 mm.

  On the other hand, the golf club head shown in Conventional Example 1 is manufactured entirely by casting. In forging, it is difficult to reduce the thickness and it is necessary to use a material having a relatively large Young's modulus. In casting molding, the thickness of the crown portion at the center position X is relatively large at 0.8 mm, and the elastic modulus of the crown portion is relatively large at 115 GPa.

  Further, in the golf club head shown in Conventional Example 2, only the crown portion is produced only by forging and the other portions are produced by casting. That is, the golf club head shown in Conventional Example 2 corresponds to the golf club head described in Patent Document 1 or Patent Document 2, and a crown portion having a relatively low elastic modulus is a side portion having a relatively high elastic modulus. And welded. In the golf club head shown in Conventional Example 2, a welded portion extending from the front end to the rear end of the golf club head exists in the vicinity of the ridge line between the crown portion and the side portion. As shown in Table 1, in the evaluation in this experimental example based on the above evaluation method, the golf club head shown in Conventional Example 2 is compared with the golf club head manufactured entirely by casting in Conventional Example 1. No significant effects were observed in any of the hit feeling, flight distance, and durability.

  In each of Experimental Examples 1 to 31, the first part is manufactured by forging and the second part is manufactured by casting. In the golf club head shown in Experimental Example 32 and Experimental Example 33, the first part and the second part are both produced by forging. In the golf club heads shown in Experimental Example 32 and Experimental Example 33, the material of the second part is KS120 titanium, and the elastic modulus of the second part is 115 GPa, which is higher than that of the first part. In the golf club head shown in Experimental Example 34, the material of the first portion is CFRP, and the second portion is manufactured by casting. The CFRP of the first part shown in Experimental Example 34 is 6 plies of P3252S-20 manufactured by Toray, 0 degrees / 90 degrees / 0 degrees / 0 degrees / 90 degrees / 0 degrees, and the thickness is 1.14 mm. The elastic modulus (Young's modulus) is 55 GPa.

First, golf club heads shown in Experimental Examples 1 to 31 will be examined. The golf club heads shown in Experimental Examples 1 to 25 correspond to the golf club head of the first embodiment. The golf club heads shown in Experimental Example 26 to Experimental Example 30 differ from the golf club head of the first embodiment in that the widths W ₁ , W _2, and W ₃ are substantially equal. . The golf club head shown in Experimental Example 31 is different from the golf club head of the first embodiment in that the width W ₁ is larger than the width W ₂ and the width W ₃ .

In the golf club head shown in Experimental Example 1, the width W ₁ in the crown portion is 50 mm and W ₁ / L is 50%. The distance D is 12 mm. In the side portion, the width W ₂ / L and the width W ₃ / L are both 20% (the width W ₂ and the width W ₃ are both 20 mm), and ((W ₁ / L) − (W ₂ / L)) and ((W ₁ / L) − (W ₃ / L)) are both 30%, and as the toe side and the heel side approach the sole part from the crown part, The width of the first part is decreasing. Further, the thickness of the forged metal layer at the center position X of the crown is 0.5 mm, and the elastic modulus of this metal layer is 80 GPa. According to the golf club head of Experimental Example 1, both the hit feeling and the flight distance are greatly improved as compared with the golf club head shown in the conventional example, and the durability is sufficient.

  The golf club heads shown in Experimental Examples 2 to 6 are different from the golf club head shown in Experimental Example 1 in the value of the elastic modulus of the crown portion. In the golf club head shown in Experimental Example 2, the value of the elastic modulus of the crown portion is 70 GPa. In the golf club head shown in Experimental Example 2, both the hit feeling and the flight distance are substantially the same as the golf club head shown in Experimental Example 1, and the durability is sufficient. The golf club head shown in Experimental Example 3 has an elastic modulus value of 45 GPa at the crown, which is significantly lower than that of the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 3, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1. Further, the golf club head shown in Experimental Example 4 has an elastic modulus value of 110 GPa at the crown portion, which is significantly higher than the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 4, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1.

  Further, the golf club head shown in Experimental Example 5 has an elastic modulus value of 55 GPa at the crown, which is lower than that of the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 5, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1, but when compared with the golf club head shown in Experimental Example 3, the hit feeling The flight distance is good. In the golf club head of the present invention, the elastic modulus of the first part is preferably 50 Gpa or more. The golf club head shown in Experimental Example 6 has a modulus of elasticity of 100 GPa at the crown, which is higher than that of the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 6, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1, but when compared with the golf club head shown in Experimental Example 4, the hit feeling The flight distance is good. In the golf club head of the present invention, the elastic modulus of the first portion is preferably 105 Gpa or less. In the golf club head of the present invention, the elastic modulus of the first portion is preferably 50 Gpa to 105 Gpa.

  The golf club heads shown in Experimental Examples 7 to 9 are different from the golf club head shown in Experimental Example 1 in the thickness of the metal layer at the center position X of the crown portion. In the golf club head shown in Experimental Example 7, the thickness of the metal layer is 0.35 mm. In the golf club head shown in Experimental Example 7, although the hit feeling is lowered as compared with the golf club head shown in Experimental Example 1, the flight distance is improved. The golf club head shown in Experimental Example 5 can also be said to be a golf club suitable for golfers. In the golf club head shown in Experimental Example 8, the metal layer has an extremely thin thickness of 0.2 mm. In the golf club head shown in Experimental Example 8, both the hit feeling and the flight distance are remarkably reduced. In addition, the durability is remarkably lowered. In the golf club head shown in Experimental Example 9, the thickness of the metal layer is extremely thick at 0.8 mm. In the golf club head shown in Experimental Example 9, both the hit feeling and the flight distance are remarkably reduced. In the golf club head of the present invention, the thickness of the metal layer at the center position X of the crown part is preferably 0.3 to 0.7 mm.

The golf club heads shown in Experimental Examples 10 to 13 are different from the golf club head shown in Experimental Example 1 in the value of W ₁ / L. The golf club head shown in Experimental Example 10 has an extremely large W ₁ / L of 80% (W ₁ = 80 mm) compared to the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 10, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are inferior. The golf club head shown in Experimental Example 11 has an extremely small W ₁ / L of 20% (W ₁ = 20 mm) as compared with the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 11, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are inferior.

The golf club head shown in Experimental Example _{12, W} 1 / L _70% and (W 1 = 70 mm), the larger the value of _W 1 / L as compared to the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 12, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1, but when compared with the golf club head shown in Experimental Example 10, the hit feeling The flight distance is good. In the golf club head of the present invention, W ₁ is preferably 75% or less of the length of the entire golf club head in the front-rear direction (L = 100 mm). The golf club head shown in Experimental Example 13 has a W ₁ / L of 30% (W ₁ = 30 mm), which is smaller than the golf club head shown in Experimental Example 1 in terms of W ₁ / L. In the golf club head shown in Experimental Example 13, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1, but when compared with the golf club head shown in Experimental Example 11, the hit feeling The flight distance is good. In the golf club head of the present invention, W ₁ is preferably 25% or more of the length of the entire golf club head in the front-rear direction (L = 100 mm). In the golf club head of the present invention, W ₁ is preferably 25% to 75% of the length L in the front-rear direction of the entire golf club head (L = 100 mm in this embodiment).

The golf club heads shown in Experimental Examples 14 to 17 are different from the golf club head shown in Experimental Example 1 in the above ((W ₁ / L) − (W ₂ / L)) and ((W ₁ / L) −. The value of (W ₃ / L) is different. The golf club head shown in Experimental Example 14 is different from the golf club head shown in Experimental Example 1 in the above ((W ₁ / L) − (W ₂ / L)) and ((W ₁ / L) − (W ₃ / L)) is extremely small at 5%. In the golf club head shown in Experimental Example 14, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are inferior. The golf club head shown in Experimental Example 15 is different from the golf club head shown in Experimental Example 1 in terms of ((W ₁ / L) − (W ₂ / L)) and ((W ₁ / L) − (W ₃ / L). )) Is extremely large at 65%. In the golf club head shown in Experimental Example 15, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are inferior.

Further, in the golf club head shown in Experimental Example 16, (W ₁ / L) − (W ₂ / L)) and ((W ₁ / L) − (W ₃ / L)) were 15%. Smaller than the golf club head shown. In the golf club head shown in Experimental Example 16, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1, but when compared with the golf club head shown in Experimental Example 14, the hit feeling The flight distance is good. In the golf club head of the present invention, ((W ₁ / L) − (W ₂ / L)) is preferably 10% or more. _{Similarly, ((W 1 / L)} - (W 3 / L)) is preferably 10% or more.

In the golf club head shown in Experimental Example 17, ((W ₁ / L) − (W ₂ / L)) and ((W ₁ / L) − (W ₃ / L)) were 55%, and Experimental Example 1 It is larger than the golf club head shown in FIG. In the golf club head shown in Experimental Example 17, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1, but when compared with the golf club head shown in Experimental Example 15, the hit feeling The flight distance is good. In the golf club head of the present invention, ((W ₁ / L) − (W ₂ / L)) is preferably 60% or less. _{Similarly, ((W 1 / L)} - (W 3 / L)) is preferably not less than 60%. In the golf club head of the present invention, ((W ₁ / L) − (W ₂ / L)) is preferably 10% to 60%. Similarly, ((W ₁ / L) − (W ₃ / L)) is preferably 10% to 60%.

  The golf club head shown in Experimental Example 18 is different from the golf club head shown in Experimental Example 1 in that the number of parts in the first portion is three parts. In the golf club head shown in Experimental Example 18, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are slightly inferior. In the golf club head according to the present invention, the first part may be configured integrally and continuously from the toe side of the side part through the crown part to the heel side of the side part. preferable.

  The golf club heads shown in Experimental Examples 19 to 23 are different in the value of the distance D from the golf club head shown in Experimental Example 1. The golf club head shown in Experimental Example 19 has a distance D of 7.0 mm.

  Compared to the golf club head shown in Experimental Example 1, the golf club head shown in Experimental Example 19 has the same hit feeling and flight distance (although slightly improved). In the golf club head shown in Experimental Example 20, the distance D is 15 mm. In the golf club head shown in Experimental Example 20, the hit feeling and the flight distance are somewhat inferior to those of the golf club head shown in Experimental Example 1, but are improved as compared with both Conventional Examples 1 and 2, respectively. It has sufficient performance. In the golf club head shown in Experimental Example 21, the distance D is 18 mm. The golf club head shown in Experimental Example 21 also has a sufficient performance, although the hit feeling and the flight distance are somewhat inferior to those of the golf club head shown in Experimental Example 1. The golf club head shown in Experimental Example 22 has a distance D of 3.0 mm and is smaller than the golf club head shown in Experimental Example 1. When compared with the golf club head shown in Experimental Example 1, the golf club head shown in Experimental Example 22 has sufficient performance, although the hit feeling, flight distance, and durability are reduced. The golf club head shown in Experimental Example 23 has a distance D of 22 mm, and the distance D is significantly larger than that of the golf club head shown in Experimental Example 1. When compared with the golf club head shown in Experimental Example 1, the golf club head shown in Experimental Example 23 has both hit feeling and flight distance decreased. In the golf club head of the present invention, the distance D is preferably 20 mm or less.

The golf club heads shown in Experimental Example 24 and Experimental Example 25 are different from the golf club head shown in Experimental Example 1 in that the width W ₂ and the width W ₃ are different. When compared with the golf club head shown in Experimental Example 1, the golf club heads shown in Experimental Example 24 and Experimental Example 25 have a sufficient performance although the hit feeling and the flight distance are slightly reduced. In the golf club head of the present invention, substantially it is preferably equal to the width W ₂ and the width W _3.

The golf club heads shown in Experimental Examples 26 to 29 are different from the golf club head shown in Experimental Example 1 in that the width W ₁ , the width W _2, and the width W ₃ are substantially equal. . The golf club head shown in Experimental Example 26 has a width W ₁ , a width W _2, and a width W ₃ of 50 mm as in Experimental Example 1. The golf club heads shown in Experimental Example 27 to Experimental Example 29 are different in the value of the width W (W ₁ = W ₂ = W ₃ ) from the golf club head shown in Experimental Example 26. The golf club head shown in Experimental Example 27 has a width W of 30 mm and is smaller than the golf club head shown in Experimental Example 26. In addition, the golf club head shown in Experimental Example 28 has a width W of 70 mm, which is larger than the golf club head shown in Experimental Example 26. In addition, the golf club head shown in Experimental Example 29 has a width W of 80 mm, which is larger than the golf club head shown in Experimental Example 26. In the golf club heads shown in Experimental Example 26 to Experimental Example 29, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the flight distance is slightly inferior. In the golf club head of the present invention, it is preferable that the width W of the first portion decreases as it approaches the side portion side from the crown portion side.

Further, the golf club head shown in Experimental Example 30 has the width W ₁ , the width W _2, and the width W ₃ substantially equal to those of the golf club head shown in Experimental Example 1, and the first portion It is also different in that the number of parts is 3 parts. In the golf club head shown in Experimental Example 30, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are slightly inferior. In the golf club head of the present invention, it is preferable that the width W of the first portion decreases as it approaches the side portion side from the crown portion side, and the first portion moves the crown portion from the toe side of the side portion. It is preferable that one member is continuously and integrally formed through the heel side of the side portion.

The golf club head shown in Experimental Example 31 differs from the golf club head shown in Experimental Example 1 in that the width W ₂ and the width W ₃ are larger than the width W ₁ . In the golf club head shown in Experimental Example 31, both the hit feeling and the flight distance are increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are slightly inferior. In the golf club head of the present invention, the first portion has a width W from the crown portion side to the side portion from the toe side of the side portion to the heel side of the side portion through the crown portion. It is preferable to decrease as it approaches the side.

  Further, the golf club heads shown in Experimental Example 32 and Experimental Example 33 differ from the golf club head shown in Experimental Example 1 in that both the first part and the second part are produced by forging. Yes. In the golf club head shown in Experimental Example 32, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are slightly inferior. In the golf club head of the present invention, it is preferable that the first part is made by forging and the second part is made by casting.

  Further, the golf club head shown in Experimental Example 34 differs from the golf club head shown in Experimental Example 1 in that the material of the first part is CFRP and the second part is made by casting. Yes. In the golf club head shown in Experimental Example 34, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, as compared with the golf club head shown in Experimental Example 1, there were many evaluation results that the feel was somewhat soft.

  In this experimental example, the evaluation was made with respect to a plurality of hollow golf club heads (Experimental Examples 1 to 16 and Conventional Example 1) shown in Table 2 below, using durability, flight distance, and hit feeling as evaluation items. I did it. Table 2 also shows the evaluation results for each item. Each evaluation item shown in Table 2 below is the same numerical value as in Table 1 obtained under the same measurement conditions as in Table 1 above. The golf club heads shown in Experimental Example 1 to Experimental Example 16 and Conventional Example 1 are all hollow golf club heads, and are configured by joining a face body and a head body composed of a first part and a second part. Has been. In each of the golf club heads shown in Experimental Examples 1 to 15 in Table 2 below, the first part is manufactured by forging and the second part is manufactured by casting. In the golf club head shown in Experimental Example 16 in Table 2 below, the first part and the second part are both produced by forging.

  In Table 2, the first portions of the golf club heads shown in Experimental Examples 1 to 16 are all produced by forging 15-15-3β type titanium alloy (composition: Ti-15Mo-5Zr-3Al). ing. The golf club heads shown in Experimental Examples 1 to 16 have substantially the same outer shell shape as the golf club heads of the experimental examples shown in Table 1. That is, the length L (see FIG. 3) is 100 mm, and the height F (see FIGS. 2 and 3) is 60 mm. The golf club head shown in Conventional Example 1 in Table 2 is the same golf club head as that shown in Conventional Example 1 in Table 1.

The golf club heads shown in Experimental Examples 1 to 15 correspond to the golf club head of the second embodiment. In the golf club head shown in Experimental Example 1, the width W at the crown is 50 mm, and the distance D is 12 mm. In the side portion, W ₁ / L is 50% (width W ₁ is 50 mm), and the width W ₂ / L and width W ₃ / L are 10% (width W ₂ and width W ₃ are 10 mm). The value of H / F is 0.15. Further, the thickness of the forged metal layer at the center position X of the crown is 0.5 mm, and the elastic modulus of this metal layer is 80 GPa. According to the golf club head of Experimental Example 1, both the hit feeling and the flight distance are greatly improved as compared with the golf club head shown in the conventional example, and the durability is sufficient.

  The golf club heads shown in Experimental Examples 2 to 4 are different from the golf club head shown in Experimental Example 1 in the value of the elastic modulus of the crown portion. In the golf club head shown in Experimental Example 2, the value of the elastic modulus of the crown portion is 70 GPa. In the golf club head shown in Experimental Example 2, both the hit feeling and the flight distance are substantially the same as the golf club head shown in Experimental Example 1, and the durability is sufficient. The golf club head shown in Experimental Example 3 has an elastic modulus value of 45 GPa at the crown, which is significantly lower than that of the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 3, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1. Further, the golf club head shown in Experimental Example 4 has an elastic modulus value of 110 GPa at the crown portion, which is significantly higher than the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 4, both the hit feeling and the flight distance are lower than the golf club head shown in Experimental Example 1. In the golf club head of the present invention, the elastic modulus of the first portion is preferably 50 Gpa to 105 Gpa.

  The golf club heads shown in Experimental Examples 5 to 7 are different from the golf club head shown in Experimental Example 1 in the thickness of the metal layer at the center position X of the crown portion. In the golf club head shown in Experimental Example 5, the thickness of the metal layer is 0.35 mm. In the golf club head shown in Experimental Example 5, compared with the golf club head shown in Experimental Example 1, the hit feeling is lowered, but the flight distance is improved. The golf club head shown in Experimental Example 5 can also be said to be a golf club suitable for golfers. In the golf club head shown in Experimental Example 6, the metal layer has an extremely thin thickness of 0.2 mm. In the golf club head shown in Experimental Example 6, both the hit feeling and the flight distance are remarkably reduced as compared with the golf club head shown in Experimental Example 1. In addition, the durability is remarkably lowered. In the golf club head shown in Experimental Example 7, the thickness of the metal layer is extremely thick at 0.8 mm. In the golf club head shown in Experimental Example 7, both the hit feeling and the flight distance are remarkably reduced. In the golf club head of the present invention, the thickness of the metal layer at the center position X of the crown part is preferably 0.3 to 0.7 mm.

Each golf club head shown in Experimental Example 8 to Experimental Example 11 is different from the golf club head shown in Experimental Example 1 in the value of W ₁ / L. In the golf club head shown in Experimental Example 8, W ₁ / L is 30% (W ₁ = 30 mm), and W ₁ / L is smaller than that of the golf club head shown in Experimental Example 1. The golf club head shown in Experimental Example 10 _{is W} 1 / L is _{70% (W 1 = 70mm)} , W 1 / L is larger than a golf club head shown in Experimental Example 1. In both Experimental Example 8 and Experimental Example 10, both the hit feeling and the flight distance are inferior to those of Experimental Example 1, but are significantly improved compared to Conventional Example 1, and have sufficient performance. Yes.

The golf club head shown in Experimental Example 9 has W ₁ / L of 20% (W ₁ = 20 mm), and has a smaller width W than the golf club head shown in Experimental Example 1. In addition, the golf club head shown in Experimental Example 11 has W ₁ / L of 80% (W ₁ = 80 mm), and W ₁ / L is larger than the golf club head shown in Experimental Example 1. In both Experimental Example 9 and Experimental Example 11, both the hit feeling and the flying distance are inferior to those of Experimental Example 1, and the flying distance is particularly comparable to that of Conventional Example 1. In the golf club head of the present invention, W ₁ is preferably 25% to 75% of the length L in the front-rear direction of the entire golf club head (L = 100 mm in this embodiment).

  The golf club head shown in Experimental Example 12 is different from the golf club head shown in Experimental Example 1 in that the number of parts in the first portion is three parts. In the golf club head shown in Experimental Example 12, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are slightly inferior. In the golf club head according to the present invention, the first part may be configured integrally and continuously from the toe side of the side part through the crown part to the heel side of the side part. preferable.

The golf club heads shown in Experimental Examples 13 to 15 are different from the golf club head shown in Experimental Example 1 in the values of the width W ₂ and the width W ₃ . Accordingly, the value of H / F is different. In the golf club head shown in Experimental Example 13, the width W ₂ and the width W ₃ are both 0, and the value of H / F is 0.3. In the golf club head shown in Experimental Example 13, although the hit feeling and the flight distance are reduced as compared with the golf club head shown in Experimental Example 1, the degree of reduction is very small. Further, the golf club head shown in Experimental Example 14 has an H / F value of 0, which is lower than that of the golf club head shown in Experimental Example 1. In the golf club head shown in Experimental Example 14, the hit feeling is slightly lowered as compared with the golf club head shown in Experimental Example 1, but the flight distance is slightly improved. In contrast, the golf club head shown in Experimental Example 15, both the width _{W 2} and the width _{W 3} being 0, the value of H / F is 0.5. Compared to the golf club head shown in Experimental Example 1, the golf club head shown in Experimental Example 15 has significantly reduced hit feeling and flight distance.

  The golf club head shown in Experimental Example 16 is different from the golf club head shown in Experimental Example 1 in that the first part and the second part are both produced by forging. In the golf club head shown in Experimental Example 16, both the hit feeling and the flight distance are greatly increased compared to the golf club head shown in the conventional example. However, compared with the golf club head shown in Experimental Example 1, the hit feeling and the flight distance are slightly inferior. In the golf club head of the present invention, it is preferable that the first portion is made by forging and the second portion is made by casting.

1 is an exploded perspective view showing a golf club configured to include a golf club head according to a first embodiment of the present invention. (A)-(d) is a figure explaining the golf club head shown in FIG. 1, (a) is the top view which looked at the golf club head 20 shown in FIG. 1 from the crown part side, FIG. 1B is a side view of the golf club head shown in FIG. 1 viewed from the toe side, FIG. 1C is a side view of the golf club head shown in FIG. 1 viewed from the heel side, and FIG. FIG. 2 is a front view of the golf club head shown in FIG. It is a schematic side view of an example of the golf club head concerning the 2nd Embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Golf club 20, 70 Golf club head 21 Head main body 22 Face body (face part)
23 face 24 first part (first part)
25 Plate-like part 26 Second part (second part)
27 Protruding part 28 Neck body (hosel part)
DESCRIPTION OF SYMBOLS 29 Opening part 32 Crown part 33 Toe side part 34 Side part 35 Heel side part 36 Sole part 37 Back side part 52,54 Join line 56 Ridge line 58 Edge line 60 Golf club shaft 62 Socket 64 Opening part 66 Upper end point 68 Intersection

Claims (11)

A golf club head having a hollow structure having a face surface for hitting a golf ball,
A substantially plate-like face body having the face surface; a head body joined to the face body to form a crown portion, a sole portion, and a side portion of the golf club head ; and projecting from the face body and the head body A neck body ,
The head main body includes at least a part of the crown part and a part of the side part, and at least the other part of the sole part and the side part having a higher elastic modulus than the first part. And the second part
The neck body is directly joined to the face body and directly joined to the first portion;
The joint end of the head body with the face body is composed of an end portion of the first portion and an end portion of the second portion, and the end portion of the first portion is a crown portion of the joint end. Extends from the entire area corresponding to the area corresponding to the side portion ,
The golf club head according to claim 1, wherein a joining line indicating a joining portion between the first portion and the second portion in the crown portion has a gentle curve protruding rearward of the head body .   The width in the front-rear direction of the golf club head in the region corresponding to the side portion of the first portion is gradually reduced as it approaches the sole portion side from the crown portion side. The golf club head according to claim 1.   3. The golf club head according to claim 1, wherein the first portion is made of a forged metal member, and the second portion is made of a cast metal member.   4. The golf club head according to claim 3, wherein each of the first portion and the second portion is a metal containing titanium as a main component.   The first portion is configured such that one member is continuously and integrally formed from a toe side of the side portion, through the crown portion, to a heel side of the side portion. The golf club head according to any one of 1 to 4.   The width in the front-rear direction of the region corresponding to the side portion of the first portion is 25% to 75% of the length in the front-rear direction of the entire golf club head. A golf club head according to any one of the above. When the height from the ground of the entire golf club head in a state where the golf club head is installed on the ground at a normal address position is F,
A length L of the entire golf club head in the front-rear direction;
A width W _{1 in the} front-rear direction of a region corresponding to the crown portion of the first portion;
The width W _{2 in the} front-rear direction of the region corresponding to the side portion on the toe side of the first portion at a position spaced apart by 0.3 F from the ground;
The width W _{3 in the} front-rear direction of the region corresponding to the side portion on the heel side of the first portion at a position separated by 0.3 F from the ground is
The golf club head according to claim 1, wherein at least one of the following formula (1) and the following formula (2) is satisfied.
0.1 ≦ ((W ₁ / L) − (W ₂ /L))≦0.6 (1)
0.1 ≦ ((W ₁ / L) − (W ₃ /L))≦0.6 (2)   The golf club head according to any one of claims 1 to 7, wherein the first portion has a thickness of 0.3 to 0.7 mm at a center position of a region corresponding to the crown portion.   9. The golf club head according to claim 1, wherein a distance between the joint portion of the first portion and the second portion from the face surface is 20 mm or less.   The golf club head according to claim 1, wherein an elastic modulus of the first portion is 50 Gpa to 105 Gpa.   A golf club comprising the golf club head according to claim 1.

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