JP2005192706A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head attaining low spinning and high driving angle of a driven golf ball and improving the carry of the driven golf ball. <P>SOLUTION: This golf club head 1 is divided into a head body 20 (a first component) including a face part 21 and a second component composed of a hosel part 11 and a connecting plate 12; and is provided with a joint position 40 joining the connecting plate 12 connected to the lower end of the hosel part 11 to an inner part wall face in the rear side of the head body 20. The direction (a loft angle) of a face 210 of the face part 21 is changed by a driving force when driving the golf ball to reduce the amount of backspin of the golf ball to be driven and increase the driving angle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a golf club head in which the direction of the loft angle direction of the face surface changes depending on the striking force when hitting a golf ball, and more particularly, golf hit with the direction of the loft angle direction of the face surface changed by the striking force The present invention relates to a golf club head that adjusts the spin amount and launch angle of a ball.

  Conventionally, as a condition for improving the flight distance of a launched golf ball, the initial velocity of the launched golf ball is increased (high initial velocity), and the reverse rotation (back spin) amount of the launched golf ball is determined. It is known that three conditions are required: keeping it low (reducing spin) and increasing the launch angle (higher strike angle). Of the above three conditions, a rule is scheduled to be revised in 2008 for increasing the initial velocity of the launched golf ball, and it is determined that an upper limit is set for the initial velocity of the launched golf ball. For this reason, after the revision of the rules, it is increasingly important to improve the flight distance of the launched golf ball by reducing the spin rate and increasing the hitting angle.

  By the way, conventionally, various proposals have been made regarding a joining method for joining the hosel part and the outer shell-shaped golf club head main body.

  For example, in a metal hollow golf club head, a lower portion of a hosel portion that extends along the center line of a golf club shaft and a sole portion are joined together, and a rubber-like is formed in a gap provided between the upper portion of the hosel portion and a crown portion. A golf club head is proposed in which a soft material such as an elastic body is inserted to deform a golf club head body itself when a golf ball is hit to obtain a golf ball with a high trajectory. (For example, refer to Patent Documents 1 and 2).

  Furthermore, the lower part of the hosel part is bent in the head body, and the lower end of the hosel part and the inner wall surface of the head body are connected to the extension line of the center line of the golf club shaft fixed to the hosel part and the sole part. Some golf club heads have structures that are joined at points other than the intersections (see, for example, Patent Documents 3, 4, and 5).

  In addition, a plastically deformable hitting ball including the face portion is joined to a connecting body configured by connecting the hosel part and the sole part, and the loft angle and the lie angle are adjusted by plastically deforming the hitting ball. Some propose golf club heads that have improved the flight distance, directionality, and feel at impact of the golf ball (see, for example, Patent Document 6).

Japanese Patent Laid-Open No. 10-1227827 JP 2002-35175 A Japanese Utility Model Publication No. 61-165761 JP 2003-79767 A JP 2003-93553 A JP-A-3-228787

  However, the golf club heads disclosed in Patent Documents 1 to 6 cannot achieve a sufficiently low spin and a high hitting angle of the launched golf ball, and are not always satisfactory in terms of flight distance.

  Accordingly, the present invention has been made in view of the above-described conventional golf club head, and it is intended to reduce the spin rate and increase the hitting angle of the golf ball when hitting the golf ball, and as a result the flight distance of the launched golf ball. An object of the present invention is to provide a new golf club head capable of improving the performance.

  In order to achieve the above object, a golf club head according to the present invention comprises a hosel portion to which a golf club shaft is fixed and a face surface for hitting a golf ball, wherein at least two components are joined to each other. A club head having a first component part including at least a hosel part and a second component part including at least a face surface. The second component part has a hitting force when hitting a golf ball. In other words, the first structural portion is bonded to the first structural portion at a bonding position that is displaced with respect to the first structural portion and changes the orientation of the face surface in the loft angle direction.

  Here, when the sole portion of the golf club head is the bottom and the hitting direction of the golf ball is the front, the joining position is determined from the position of the intersection of the perpendicular line drawn from the center of gravity of the golf club head to the face surface and the face surface. It is preferable that the lower end of the golf club shaft is provided at a position that is 5 mm or more backward with respect to the position of the intersection of the center line of the golf club shaft fixed to the hosel portion and the sole portion.

  Further, at least one of the first component and the second component is composed of an outer shell-shaped member, and among the outer shell-shaped members, the thickness of the member in the vicinity of the joining position is: It may be thinner than the thickness of the member other than the vicinity of the joining position. Here, the vicinity of the joining position refers to within 20 mm, preferably within 15 mm from the joining position.

  Further, at least one of the first component part and the second component part is configured by an outer shell-shaped member, and among the outer shell-shaped members, the elastic modulus of the member in the vicinity of the joining position is: It may be lower than the elastic modulus of the member other than the vicinity of the joining position.

  Further, the second component part is an outer shell-shaped head body including a crown part having an opening for penetrating the hosel part, a face surface, a sole part, and a side part. When the striking direction is the front, the first component portion extends rearward from one end of the hosel portion having one end inside the outer shell-shaped head main body penetrating the opening. It is preferable to have a connecting plate that makes contact with the inner wall surface of the side portion to create the joining position. At that time, an elastic body may be inserted between the opening and the hosel portion passing through the opening.

  In addition, when the first constituent part including the sole part and the hosel part, the second constituent part including the face surface, the sole part as the bottom part, and the golf ball hitting direction as the front part, Preferably, the first component and the second component are joined at a position on the rear side of the gap. At that time, a sheet-like elastic body may be inserted into the gap.

  When the golf ball hitting direction is the front, the second component portion has a three-dimensional shape with the face surface as the front end, and the first component portion is the second component other than the face surface. An outer shell shape including a hosel part, a crown part, a side part, and a sole part formed so as to cover the constituent parts is formed, and the second constituent part is the crown part and the side part of the first constituent part. Alternatively, it is preferable that a gap is formed between the inner wall surface of the first component part and the outer surface of the second component part. At this time, an elastic body may be inserted in the gap.

  Further, when the golf ball hitting direction is the front, the first component part is formed by integrating the hosel part, the main part of the crown part, a part of the rear part of the sole part, and a part of the rear part of the side part. The second component part is obtained by integrating the face surface, a part of the front part of the crown part, a part of the front part of the sole part, and a part of the front part of the side part. And the joining position is provided at a sole portion of the golf club head, and a gap is formed by a part of the second component portion in front of the crown portion and a main portion of the crown portion. preferable. At that time, an elastic body may be inserted in the gap.

  Moreover, it is preferable that the said elastic body has a tensile elasticity modulus of 80 GPa or less.

  According to the present invention, the second component is joined so that the second component is displaced with respect to the first component by the striking force when the golf ball is hit. Thus, a golf club head can be provided that can reduce the spin and increase the hitting angle of the golf ball and improve the flight distance of the hit golf ball.

(First embodiment)
Hereinafter, the golf club head according to the first embodiment of the present invention will be described. FIG. 1 is a view schematically showing a longitudinal section of a golf club head 1 according to the present embodiment, FIG. 2 is a perspective view of the golf club head 1, and FIG. 3 is a hosel part of the golf club head 1. FIG. 4 is a side view of the golf club head 1 cut along the outer peripheral edge of the face portion, as viewed obliquely downward on the face surface side. FIG. 3 is a top view of the golf club head 1 cut along the outer edge of the crown portion. As shown in FIGS. 1 to 4, the golf club head 1 according to the present embodiment is a hollow golf club head including a hosel portion 11, a face portion 21, a crown portion 22, a side portion 23, and a sole portion 24. .

  The golf club head 1 according to the present embodiment has two constituent parts: a first constituent part including a hosel part 11 to which a golf club shaft is fixed and an outer shell-like second constituent part including a face part 21. A face surface 210 that hits and hits a golf ball is formed on the face portion 21. That is, as shown in FIG. 1, the hosel portion 11 has a lower end located in a hollow portion surrounded by the outer shell-shaped second component, and is coupled to the connecting plate 12 at the lower end. The connecting plate 12 is integrated to form a first component. On the other hand, the face portion 21 constitutes an outer shell-shaped golf club head main body (hereinafter simply referred to as “head main body”) 20 integrated with the crown portion 22, the side portion 23, and the sole portion 24. The main body 20 is the second component.

  Of the head main body 20 that is the second component of the golf club head 1 according to the present embodiment, the side portion 23 and the sole portion 24 are integrally formed members, for example, a 6-4Ti alloy (Ti-6Al— 4V) or the like is formed by casting a titanium alloy.

  As shown in FIGS. 2, 3, and 4, the side portion 23 has a curved shape bulging outward corresponding to the side surface of the wood type golf club head. The thickness of the side portion 23 is not particularly limited as long as it can withstand the striking force when the golf ball is hit. Typically, the thickness of the side portion 23 is preferably 0.5 to 3.0 mm. Further, as will be described later, the side portion 23 may be formed with a portion having a reduced thickness.

  As shown in FIGS. 1 and 3, the sole portion 24 has a curved shape bulging outward corresponding to the bottom surface of a wood type golf club head. The thickness of the sole portion 24 is not particularly limited as long as it can withstand the striking force when the golf ball is hit. Typically, the thickness of the sole portion 24 is preferably 1.0 to 4.0 mm. Further, as will be described later, the sole portion 24 may be formed with a thinned portion.

  In addition, the sole part 24 and the side part 23 which comprise the head main body 20 may be comprised as a separate independent member. For example, one titanium or titanium alloy plate is trimmed into a developed view and pressed to form a sole member and a side member, and then welded and integrated at the boundary portion between the sole portion and the side portion.

  The face portion 21 is formed by trimming a titanium or titanium alloy plate along the edge of the face surface 210 of the head main body 20 to create a plate-like face member. The face member is made of the side portion 23, the sole portion 24, and the crown. It attaches by welding to the edge part of each front side of the part 22. FIG.

  The thickness of the face portion 21 is not particularly limited as long as it can withstand the striking force when the golf ball is hit. Typically, the thickness of the face portion 21 is preferably 2.0 to 4.0 mm.

  As shown in FIGS. 1 and 2, the crown portion 22 has a curved shape bulging outward corresponding to the upper surface of a wood type golf club head. The crown part 22 is made of, for example, a titanium alloy such as a 6-4Ti alloy, and is attached by welding to the upper ends of the side part 23 and the face part 21 made of titanium or a titanium alloy. As shown in FIGS. 1 and 2, an opening 2201 is provided in a portion of the crown portion 22 constituting the head body 20 through which the hosel portion 11 passes. The upper portion of the hosel portion 11 passes through the opening 2201 and protrudes above the crown portion 22. The hosel portion 11 and the crown portion 22 are separated from each other through the opening 2201.

  An elastic body 30 made of a material having a lower elastic modulus than the material constituting the hosel part 11 and the head main body 20 is inserted into the opening part 2201, and the hosel part 11 is caused by a striking force when hitting a golf ball. On the other hand, the crown portion 22 and thus the head main body 20 can be displaced to change the orientation of the face surface 210. At the same time, the elastic body 30 seals the internal space of the head body 20. As the elastic body 30, for example, a material having a low elastic modulus such as rubber, resin, or magnesium alloy can be used. This elastic body preferably has a tensile elastic modulus, for example, 80 GPa or less. By setting the tensile elastic modulus of the elastic body 30 to 80 GPa or less, when the golf ball is hit, the crown portion 22 and the head main body 20 are displaced with respect to the hosel portion 11 to effectively change the orientation of the face surface 210. be able to.

  The hosel portion 11 constituting the first component is a tubular member, and a connecting plate 11 is attached to the lower end of the tubular hosel portion 11. Both the hosel part 11 and the connecting plate 12 are made of a titanium alloy such as a 6-4Ti alloy.

  The connecting plate 12 is a plate-like member that connects the lower end of the hosel portion 11 and the inner wall surface of the head body 20. As shown in FIG. 5, the connecting plate 12 according to the present embodiment has a narrow end on the side coupled to the hosel part 11 and is joined to the opposite end, that is, the inner wall surface of the side part 23. It has a divergent shape that continuously increases in width as it approaches the side end. Further, as shown in FIG. 5, when the golf ball striking direction (the X direction in FIG. 5) is the front, the rear of the connecting plate 12 (hereinafter, the golf ball striking direction is referred to as “front”. The direction opposite to the striking direction is referred to as “rearward”), that is, the shape of the end portion on the side joined to the inner wall surface of the side portion 23 on the side opposite to the face surface 210 is It is formed in a curved shape that bulges rearward and matches the shape. In addition, the shape of the connection plate 12 is not limited to the shape of a present Example. For example, a band-shaped shape having a certain width may be provided from the end portion on the hosel portion 11 side to the end portion on the side joined to the inner wall surface on the rear side of the side portion 23.

  Further, the connecting plate 12 may be formed of a material that is elastically deformed. Furthermore, it may be formed of a material thinner than members constituting other parts of the outer shell-like head main body 20 such as the face part 21, the crown part 22, the sole part 24, and the side part 23. Further, the connecting plate 12 may include a portion formed to be partially thin. Furthermore, one end may be thick, the other end may be thin, and the thickness between the two ends may be formed of a plate-like member that continuously decreases or increases at a constant rate. .

  A portion constituting the outer shell of the head body 20 in the vicinity of the joining position between the connecting plate 12 and the inner wall surface of the head body 20, for example, a part of the side portion 23, the crown portion 22, and the sole portion 24, near the joining position 40. Compared with the material which comprises parts other than side part 23, crown part 22, sole part 24, etc., you may provide the part which made thickness thin. In this embodiment, as shown in a small circle A in FIG. 1, when the connecting plate 12 is joined to the inner wall surface on the rear side of the side portion 23, the side plate 23 is joined to the side portion 23 where the connecting plate 12 is joined. A thin portion is provided. For example, the side part 23 other than the vicinity of the joining position 40 is made of a material having a thickness of 1.5 to 2.5 mm, and the thickness of the side part 23 of the part joined at the joining position 40 is set to the thickness of the above part. A case where the thickness is 1.0 to 2.0 mm, which is about 0.5 mm thinner, is exemplified.

  Moreover, compared with the material which comprises parts other than the vicinity of the joining position 40, such as side part 23, crown part 22, and sole part 24, using the material which has a thin part, the vicinity of the joining position 40 is used. By forming the head main body 20, the head main body 20 that is the second component part can be easily displaced with respect to the first component part by the striking force when the golf ball is hit.

  In the present invention, the head main body 20 that is the second constituent part including the face surface 210 is joined to the hosel part 11 and the connecting plate 12 that are the first constituent part so as to be displaceable. . In addition, the second component portion is provided at the joint position 40 where the orientation of the face surface 210 is changed by the striking force when the golf ball is hit.

  In the golf club head 1 according to the present embodiment, the joining position 40 is provided at a position where the connecting plate 12 and the inner wall surface of the head main body 20 abut. Specifically, as shown in FIGS. 1 and 5. A joining position 40 is provided at a position where the connecting plate 12 and the inner wall surface on the rear side of the side portion 23 come into contact with each other.

  In the present embodiment, when the sole portion of the golf club head is the bottom, the joining position 40 is lower than the position of the center of gravity of the surface, that is, the intersection of the perpendicular line from the center of gravity of the golf club head to the face surface and the face surface. 5 mm behind the golf ball hitting direction from the face surface 210 with respect to the intersection point E where the straight line extending the center line of the golf club shaft, that is, the center line of the hosel part 11 intersects with the sole part 24 It is provided at the position retracted as described above.

Here, how to obtain the position of the joining position 40 will be described. As shown in FIG. 1, a perpendicular line is drawn from the position of the center of gravity G of the golf club head 1 to the face surface 210 to obtain an intersection point Gs between the perpendicular line and the face surface 210. “Position below the intersection of the perpendicular line and the face surface from the center of gravity of the golf club head to the face surface 210” means that the golf club head 1 is placed on a horizontal plane at a normal address position, and from the horizontal plane. When the height to the intersection point Gs is h ₁ and the height from the horizontal plane to the joining position 40 is h ₂ , this is a position where the condition of h ₁ > h ₂ is satisfied.

  In addition, “the position where the extension line of the center line of the golf club shaft intersects with the sole portion 24 backwards by 5 mm or more from the face surface 210” means that the face angle of the face surface 210 is 0 degree, When the golf club head 1 is installed in a horizontal plane at a normal address position, the golf club shaft is extended from the center line of the golf club shaft, that is, from the center line of the hosel portion 11 to the position of the intersection E of the sole portion 24. In addition, it refers to a position that is retracted 5 mm or more in the normal direction of the plane including the center line of the hosel part 11.

Here, installing at the normal address position means that the golf club head is installed at the lie angle, and the center axis of the golf club shaft and the leading edge of the face portion of the golf club head at that time are from above the horizontal plane. The installation is such that they are parallel to each other, that is, the face angle is 0 degree. The installation according to the lie angle means that the clearance between the round surface of the sole portion forming the bottom surface of the golf club head and the horizontal surface is substantially equal on the toe side and the heel side. If the round surface of the sole portion is unclear, the score line formed on the face surface may be installed so that the horizontal plane is parallel. In addition, in a golf club, when it is difficult to determine whether or not the round surface of the sole portion is parallel to the horizontal plane because the score line is not linear, the lie angle is the lie angle (degrees). = (100-club length (inch)). For example, if the club length is 44 inches, the lie angle is 100−44 = 56 degrees.
Here, the club length is measured by a measuring method defined by the Japan Golf Equipment Association. An example of the measuring device is Club Major II manufactured by Kamoshita Seikosho Co., Ltd.

  As a preferable position for providing the joining position 40 in this way, “a position below the intersection of the perpendicular line from the center of gravity of the golf club head to the face surface and the face surface and the position of the golf club shaft” With respect to the position of the intersection point E where the center line, that is, the straight line extending the center line of the hosel part 11 intersects with the sole part 24, a position where the golf ball has been retreated 5 mm or more backward in the direction of hitting the golf ball, The amount of displacement of the second component relative to the first component that occurs when the first component receives a striking force from the golf ball can be effectively increased, and the orientation of the face surface 210 in the loft angle direction The change of can be enlarged.

  In the present embodiment, the joining position 40 is joined by welding the end portion of the connecting plate 12 and the inner wall surface of the side portion 23. As another joining method, you may adhere | attach the connection plate 12 edge part and the internal wall surface of the back side of the side part 23. FIG.

  In addition, only a portion where the joining position 40 is formed is made of a material having a low elastic modulus as compared with materials constituting the parts such as the side portion 23, the crown portion 22 and the sole portion 24 other than the vicinity of the joining position 40. Also good. For example, as shown in the small circle A ′ shown in FIG. 1, only the vicinity of the joint portion 40 is formed as one independent joint member 42 using a material having a low elastic modulus. On the other hand, the method of welding the end part 12e of the connection plate 12, the end part 23e of the side part 23, and the end part 24e of the sole part 24 is illustrated. As a method of joining the second component part to the first component part, in addition to welding and bonding, the second component part is joined to the first component part so as to be displaceable by using a hinge or the like. Also good.

  Next, the operation of the golf club head 1 when the golf club head 1 according to this embodiment and a golf ball (hereinafter simply referred to as “ball”) hit each other will be described. FIG. 6 is a perspective view schematically showing the movement of the golf club head 1 before and after the ball and the face surface 210 of the golf club head 1 hit each other. In the figure, the solid line indicates the position of the head main body 20 before the ball and the face surface 210 of the golf club head 1 hit, and the two-dot chain line indicates the head main body when the ball and the face surface 210 of the golf club head 1 hit. 20 positions are shown. As indicated by the solid line and the alternate long and two short dashes line in FIG. 6, compared to the state before the ball hits the face surface 210 (shown by the solid line), the ball hits the face surface 210 (shown by the two-dot chain line). In the figure, the head body 20 is displaced in the direction of lifting with the joining position 40 as a fulcrum.

  This is because the striking force when the ball hits the face surface 210 acts on the face surface 210 and the face surface 210 receives a rightward force in the drawing. At this time, the head main body 20 including the face surface 210 is joined to the hosel part 11 and the connecting plate 12 which are the first constituent parts at the joining position 40, and at the joining position 40, the first constituent parts (the hosel part 11 and The second component (head body 20) is joined to the connecting plate 12) so as to be displaceable. Therefore, the head main body 20 that receives the ball striking force is displaced so as to rotate in the direction in which the face surface 210 is lifted (the direction in which the loft angle increases) with the joint position 40 as a fulcrum. As a result, as indicated by a two-dot chain line in FIG. 6, the face surface 210 also lifts with the joint position 40 as a fulcrum, and the face surface 210 changes upward so that the loft angle becomes large. Specifically, the face surface 210 changes the direction from the arrow A to the arrow B in FIG.

  When the ball receives a striking force from the face surface 210, backspin is generated in the ball due to the action of the loft angle of the golf club head 1. On the other hand, at this time, the face surface 210 changes the direction of the face surface 210 from the arrow A to the arrow B, so the direction of the face surface 210 rotates to the right in FIG. For this reason, a left rotation component in FIG. 6 is generated in the ball. As a result, the backspin amount of the launched ball is kept low, and a low spin rate is realized.

  Further, when the ball hits the face surface 210 and the face surface 210 is displaced to rotate in the direction of lifting with the joint position 40 as a fulcrum, the orientation of the face surface 210 changes so as to be upward, and before the ball is hit. In addition, since the ball is launched in a state where the loft angle of the face surface 210 is increased, the launch angle of the ball is increased and a high hitting angle is achieved. For this reason, the effect of lowering the spin and the effect of increasing the hitting angle described above are combined to improve the flight distance of the ball.

  As described above, in the golf club head 1 according to the present embodiment, the first component part in which the hosel part 11 and the connecting plate 12 are integrated, the face surface 210 as the second component part, and the crown part. 22, the head body 20 including the side portion 23 and the sole portion 24 are joined to each other at a position behind the side portion 23 or the sole portion 24 so as to be displaceable. Therefore, when the ball is hit, the head main body 20 as the second component is displaced in the direction in which the face surface 210 is lifted with the joining position 40 as a fulcrum. At this time, the face surface 210 can change the direction in the upward direction with the joint position 40 as a fulcrum, and the backspin amount of the hit ball can be reduced. Further, since the face surface 210 rotates upward when the ball is hit, the loft angle when the ball is hit increases. As a result, the launch angle of the ball increases. As described above, the effect of reducing the backspin amount at the time of hitting and the effect of increasing the launch angle are combined to provide an effect of improving the flight distance of the ball.

  When the golf club head 1 according to the present invention is used to hit a ball, the head body 20 is displaced in the direction of lifting with the joint position 40 as a fulcrum regardless of the hit position of the face surface 210 and the position of the center of gravity of the ball. The face surface 210 changes in the upward direction. Therefore, the ball launched by the golf club head 1 according to the present invention has an effect that a low spin and a high hitting angle are achieved and the flight distance is improved.

  Further, in the above embodiment, the golf club head 1 made of a so-called wood type hollow metal formed of titanium or a titanium alloy as a metal has been described as an example, but the present invention is not limited to this. For example, the present invention can be applied to a so-called iron type golf club head.

  Examples of the present invention will be described below. A golf club head (hereinafter referred to as “test head”) was produced by the method shown below, and a test hit test was performed.

1. Preparation of test head

  A test plate of the same type as the golf club head shown in FIGS. 1 and 2 by welding a connecting plate 12 coupled to the hosel part 11 to the inner wall surface of the side part 23 of the head body 20 to the head body 20 made of titanium alloy. Was made. The hosel part 11 and the connecting plate 12 were also made of a titanium alloy. The types of test heads are those in which the joining position between the head body and the connecting plate does not satisfy the conditions defined in the present invention (Comparative Examples 1 to 3), and the joining positions satisfy the conditions defined in the present invention. (Example 1), a material in which the thickness of the material in the vicinity of the joining position of the test head of Example 1 is partially reduced (Example 2), and a material having a low elastic modulus at the joining position of the test head of Example 2 (Embodiment 3), and a material (Example 4) in which an elastic body having a low elastic modulus is inserted into a gap between the members of the test head of Example 3 (a gap between the crown portion and the hosel portion). Produced. For comparison, a conventional head made of titanium alloy (product number HS315, manufactured by Yokohama Rubber Co., Ltd.) was used.

  The conditions defined in the present invention are as follows: “When the golf club head sole is the bottom and the golf ball hitting direction is the front, the first component (connecting plate) and the second component (head body) ) Is lower than the position of the intersection of the perpendicular line from the center of gravity of the golf club head to the face surface and the face surface, and the center line of the golf club shaft fixed to the hosel part is extended. It is provided at a position retracted by 5 mm or more with respect to the position of the intersection of the line and the sole portion.

2. Test method

  The test head was set in a test hitting device (test hitting robot), and the head speed was 40 m / sec. The ball was made a test hit with the hit point position as the center of gravity of the face surface. Evaluation was made by measuring the launch angle, backspin amount, and flight distance of the launched golf ball. The test results are shown in Table 1. In Table 1, “joint position height” indicates the difference between the joint position height and the height of the center of gravity of the face surface. When the value is positive, it indicates that the joint position is higher than the center of gravity of the face surface. A negative value indicates that the joining position is lower than the center of gravity of the face surface.

  In Table 1, “Distance from intersection point E” is the ball hitting position at the position in the golf ball striking direction, that is, the position of the intersection point E between the extension line of the center line of the golf club shaft and the sole portion and the joining position. Indicates the distance in the direction. When the value is negative, it indicates that it is on the front side (face side) from the intersection E between the center line of the golf club shaft and the sole. When the value is positive, the golf club shaft It shows that it exists in the back side rather than the intersection E of the centerline and sole part. “Thickness at the joint position” indicates whether the thickness of the material on the side part near the joint position is the same as or thinner than the thickness of the material on the side part other than near the joint position. It represents that the thickness of the material of the side portion of the joint portion is 0.5 mm, which is thinner than the thickness of the material of the side portion other than the vicinity of the joining position. “Junction position elastic modulus” indicates whether the elastic modulus of the side part in the vicinity of the bonding position is higher or lower than the thickness of the material of the side part other than the vicinity of the bonding position. The value of the elastic modulus of the side part near the position is shown. “The elastic modulus of the interpolated elastic body” indicates the elastic modulus of the elastic body 30 inserted into the opening 2201 of the crown portion 22.

  In Table 1, “launch angle”, “spin value”, and “flying distance” are relative index values when the launch angle, spin amount, and flying distance of the conventional product are set to 100, respectively. “Square” indicates that the larger the number, the greater the launch angle, “Spin value” indicates that the higher the number, the lower the spin is achieved, and “Flying distance” increases the flying distance as the number increases It is shown that.

  As can be seen from the results in Table 1, in the test head (Comparative Example 1) in which the joint position height is higher than the center of gravity of the face surface and is close to the intersection point E, the launch angle and backspin amount are the same as the conventional product. There is no improvement in the flight distance. Further, when the joining position height is higher than the center of gravity position of the face surface, even with the test head (Comparative Example 2) where the joining position is provided at a position 5 mm or more rearward from the intersection E, the launch angle and Neither the backspin amount nor the flying distance is improved compared to the conventional product. Furthermore, even if the joining position height is lower than the center of gravity position of the face surface, the test head (Comparative Example 3) provided with the joining position at a position close to the intersection E has both the launch angle and the backspin amount as compared with the conventional product. Equivalent and no improvement in flight distance.

  On the other hand, in the test head (Example 1) in which the joining position height is lower than the center of gravity position of the face surface and the joining position is provided at a position 5 mm or more rearward from the intersection E, the launch angle and The backspin amount has also been improved compared to the conventional product, and the flight distance has also been improved. From these results, only when the two conditions of the joining position being at a position lower than the center of gravity of the face surface and providing the joining position at a position 5 mm or more behind the intersection E are satisfied are satisfied. It can be seen that the launch angle increases, the backspin amount decreases, and the flight distance improves.

  Furthermore, in the test head (Example 2) in which the thickness of the material of the side portion near the joining position of the test head of Example 1 is thinned, the launch angle and the backspin amount are further improved, and the flight distance is further improved. . Further, in the test head (Example 3) in which the material of the side portion in the vicinity of the joining position of the test head of Example 2 is formed of a material having a low elastic modulus, the launch angle and the backspin amount are further improved, and the flight distance is increased. Further improve. Furthermore, in the test head (Example 4) in which the elastic body inserted in the gap between the members of the test head of Example 3 is replaced with an elastic body having a lower elastic modulus, the launch angle and the backspin amount are further improved. , Flying distance is further improved.

(Second embodiment)
Next, a second embodiment of the present invention will be described. In the golf club head according to the present embodiment, the first component including the sole portion and the hosel portion, the second component including the face surface, the sole portion as the bottom, and the hitting direction of the golf ball as the front A gap portion formed rearward from the lower portion of the face surface, and the first component portion and the second component portion are joined at a position on the rear side of the gap portion. Has a structure in which a sheet-like elastic body is inserted. FIG. 7A is a side view of the golf club head 1a according to the present embodiment as viewed from the hosel portion 11a side. As shown in FIG. 7A, in the golf club head 1a according to the present embodiment, a first component part in which the sole part 24a and the hosel part 11a are integrated, a face part 21a, a crown part 22a, And a second structural part which is a hollow structure including the side part 23a and further having a bottom part 25a is joined at a joining position 40a provided on the rear side of the golf club head 1a.

  The first component part is configured by joining a plate-like sole member 24a and a hollow tubular hosel part 11a, and the second component part is a face part 21a, a crown part 22a, a side part 23a, and a bottom part 25a. It is a hollow structure containing.

  The first component and the second component are joined so as to be displaceable via a joining position 40a provided on the rear side. As shown in the small circle B in FIG. 7A, the joining position 40a is formed of a material that is thinner by about 0.5 mm than the thickness of the material that constitutes the side portion 23a adjacent to the upper side thereof. It has a structure that is more elastically deformed than 23a.

Further, a gap formed between the first component and the second component, specifically, a gap formed between the upper surface of the sole member 24a and the bottom 25a of the second component. A sheet-like elastic body 30a is interposed between the two. The elastic body 30a is mainly provided for preventing entry of dust, water, etc., but the elastic body 30a may not be provided as shown in FIG.
In the second embodiment, as in the first embodiment, when the ball hits the face surface 210a of the first component portion when the ball is hit, the first component portion supports the joint position 40a. The face surface 210a is displaced in the lifting direction. For this reason, the amount of back spin given to the ball by the face surface 210a decreases (lower spin rate). Further, the rotation of the first component changes the orientation of the face surface 210a upward (increases the loft angle), so that the launch angle of the ball when it is struck is increased (higher strike angle). . As a result, the flight distance of the golf ball launched by combining the effect of lowering the spin and the effect of increasing the hitting angle is improved.

  In the present embodiment, the first structural portion in which the sole portion 24a and the hosel portion 11a are coupled is a hollow structure having a face portion 21a, a crown portion 22a, a side portion 23a, and a bottom portion 25a. Although the example applied to the golf club head 1a having a so-called wood-type shape in which the two constituent parts rotate has been described, the present invention is not limited to this. That is, the present invention can be applied to a so-called iron type golf club.

(Modification)
As a modification of the present embodiment, an example applied to an iron type golf head can be given. In this modification, a substantially horizontal gap is provided in the sole part of the iron-type golf club head 1b, and a joining position is provided on the rear side (rear side) of the gap. FIG. 8 is a side view of a golf club head 1b according to a modification of the present embodiment as viewed from the opposite side of the hosel part 11b. As shown in FIG. 8, a gap 22b is formed from the lower part of the face surface 210b of the iron type golf club head 1b in the direction opposite to the ball striking direction, and a part of the rear side of the sole part 24b is left. A joining position 40b is provided at this portion. A sheet-like elastic body 30b is inserted into the gap portion 22b and joined so that the face surface 210b can be displaced with respect to the hosel portion 11b by a striking force when a golf ball is hit. In the iron-type golf club head 1b having such a structure, the face surface 210b is displaced with respect to the hosel portion 11b by the striking force when the golf ball is hit, and the orientation of the face surface 21b changes in the upward direction. Therefore, the flying distance of the golf ball that is launched is improved by the combination of the decrease in the backspin amount (lower spin rate) and the increase in the launch angle (higher strike angle).

(Third embodiment)
Next, a third embodiment of the present invention will be described. In this embodiment, the golf club head is divided into a first component part having an outer shell shape including a sole part and a second component part having a three-dimensional shape including a face surface. It has a double structure housed inside one component. FIG. 9 is a longitudinal sectional view of the golf club head 1c according to the present embodiment cut along a plane orthogonal to the face surface. As shown in FIG. 9, the golf club head 1c according to the present embodiment has an outer shell shape including the sole portion 24c, the crown portion 22c, and the hosel portion 11c and having an opening 2202 at a position corresponding to the face portion. The portion is the first component. Further, it has a face portion 21c, an upper surface portion 221, a side surface portion 231, and a bottom surface portion 241, and when the hitting direction of the golf ball is the front, the face surface 21c of the face portion 21 is the front end, and a solid that swells rearward. The portion forming the shape is the second component. The first component and the second component are joined at a joining position 40c provided between the rear inner wall surface of the first component and the rear outer surface of the second component. Yes.

  The first component is a shape obtained by cutting a face portion from a so-called wood type golf club head, that is, an outer shell of a golf club head including a crown portion 22c, a sole portion 24c, a side portion 23c, and a hosel portion 11c. The shape which comprises is equipped. On the other hand, the second component includes an upper surface portion 221, a side surface portion 231, and a bottom surface portion 241 that extend rearward from the edge of the face surface 210c. The upper surface portion 221, the side surface portion 231, and the bottom surface portion 241 form an outer surface that is inclined so that the width and height continuously decrease as the distance from the outer peripheral edge of the face portion 21c increases in the rearward direction. The three-dimensional shape of the outer shape is made as if the constituent parts of the above are made smaller. The first component is configured to cover the second component other than the face surface.

  As shown in FIG. 9, the second component part is accommodated inside the first component part, and the position of the tip on the rear side of the second component part and the first component part on the rear side of the first component part. A joining position 40c is formed between the inner wall surface at the back. As shown in a small circle C in FIG. 9, the material constituting the portion of the joining position 40c is made of a material that is thinner than the surroundings, and the thinned portion is joined, for example, by welding. Is formed.

  As shown in the small circle C of FIG. 9, the joining position 40c is formed of a material that is approximately 0.5 mm thinner than the thickness of the material constituting the side portion 23c adjacent to the upper side, and is smaller than the side portion 23c. It has a structure that is easily elastically deformed. Further, a gap formed between the first component and the second component, specifically, a lower portion between the sole member 24c and the first member, a crown portion 22c and an upper portion of the second component, Elastic bodies 301c and 302c are inserted at positions close to the face portion of the gap formed between the two. These elastic bodies 301c and 302c are provided mainly for preventing entry of dust and water. Then, the second component can be displaced with respect to the first component by the striking force when the golf ball is hit.

  In the third embodiment, as in the first embodiment, when the ball hits the face portion 21c of the first component, the first component lifts the face surface 210c with the joint position 40c as a fulcrum. Displace in the direction. For this reason, the amount of back spin at the time of hitting the ball by the face portion 21c is reduced (lower spin). Further, since the orientation of the face surface 210c is changed upward due to the displacement of the first component portion, the loft angle at the time of hitting increases and the ball launch angle increases. As a result, the flight distance of the ball that is launched due to the combination of the effect of lowering the spin and the effect of increasing the hitting angle is improved.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In this embodiment, when the hitting direction of the golf ball is the front, the golf club head is divided into two components, a rear component including the hosel portion and a front component including the face portion. These have a structure in which these are joined by a joint provided in the sole part. FIG. 10 is a longitudinal sectional view of the golf club head 1d according to the present embodiment cut along a plane orthogonal to the face surface 210d. As shown in FIG. 10, in the golf club head 1d according to this embodiment, the rear part 221d occupying the main part of the crown part, the hosel part 11d, the rear part 231d occupying a part of the rear part of the side part, and the sole part The first part is formed by integrating the rear part 241d occupying a part of the rear part of the front part 220d, the face part 21d occupying a part of the front part of the crown part, and the front part of the sole part. The second component is obtained by integrating the front portion 240d occupying the portion and the front portion 230d occupying a part of the front of the side portion. The first component and the second component are joined at a joint position 40d provided at the boundary between the front portion 240d and the rear portion 241d of the sole portion.

  The first component is a case where a so-called wood-type golf club head 1d is obliquely cut from between the crown portion and the hosel portion 11d to the rear portion of the sole portion and cut into two parts, a front portion and a rear portion. It is comprised with the member which comprises the back part of. The second constituent part is constituted by a member constituting the front part of the remaining part of the golf club head 1d. As shown in FIG. 10, the first component and the second component are joined at a joining position 40d provided in the middle of the sole part. Specifically, as shown by a small circle D in FIG. 10, the golf ball has a shape such that the end portion of the front portion 240d of the sole portion and the end portion of the rear half portion 241d of the sole portion are fitted. The front portion 240d has a structure capable of displacing the joint position 40d as a fulcrum with respect to the rear portion 241d and the hosel portion 11d by the striking force when hit.

  In addition, there is a gap formed between the first component and the second component, specifically, a gap formed between the front portion 220d of the crown portion and the rear portion 221d of the crown portion. An elastic body 30d is inserted. This elastic resistance 30d is provided mainly for preventing entry of dust, water and the like. The elastic body 30d is deformed by the striking force when the golf ball is hit, thereby allowing the second component to be displaced with respect to the first component. In the fourth embodiment, as in the first embodiment, when the ball hits the face 21d of the first component, the face surface 210d of the first component lifts with the joint position 40d as a fulcrum. Displace in the direction. For this reason, the amount of back spin at the time of hitting the ball by the face portion 21d is reduced (lower spin). Further, since the orientation of the face surface 210d is changed upward due to the displacement of the first component portion, the loft angle when the ball is hit is increased and the launch angle of the ball is increased (high hitting angle). As a result, the flight distance of the golf ball launched by combining the effect of lowering the spin and the effect of increasing the hitting angle is improved.

1 is a schematic view of a longitudinal section of a golf club head according to a first embodiment of the present invention. 1 is a perspective view of a golf club head according to a first embodiment of the present invention. 1 is a side view of a part of a golf club head according to a first embodiment of the present invention cut. It is the figure which looked at what cut | disconnected the face part of the golf club head which concerns on 1st embodiment of this invention from the front diagonally downward. It is the figure which looked at what cut | disconnected the crown part of the golf club head which concerns on 1st embodiment of this invention from the top. It is explanatory drawing explaining the deformation | transformation when a ball is hit with the golf club head which concerns on 1st embodiment of this invention intelligibly. (A) And (b) is a side view of the golf club head concerning a second embodiment of the present invention. It is a side view of the modification of the golf club head concerning a second embodiment of the present invention. It is a longitudinal cross-sectional view of the golf club head which concerns on 3rd embodiment of this invention. It is a longitudinal cross-sectional view of the golf club head which concerns on 4th embodiment of this invention.

Explanation of symbols

1 golf club head 11 hosel part (first component)
12 Connecting plate (first component)
20 Head body (second component)
21 Face part (second component)
210 Face surface (second component)
22 Crown (second component)
23 Side part (second component)
24 Sole (second component)
30 Elastic body

Claims (12)

A golf club head comprising a hosel portion to which a golf club shaft is fixed and a face surface for hitting a golf ball, wherein at least two components are joined to each other,
A first component including at least a hosel part;
A second component including at least a face surface;
The second component portion is displaced with respect to the first component portion by a striking force when a golf ball is hit, and the second component portion is in a joint position where the orientation of the face surface in the loft angle direction changes. A golf club head, wherein the golf club head is bonded to one component.   When the sole part of the golf club head is the bottom and the striking direction of the golf ball is the front, the joining position is lower than the position of the intersection of the perpendicular line from the center of gravity of the golf club head to the face surface and the face surface, The golf club shaft fixed to the hosel part is provided at a position retracted by 5 mm or more with respect to the position of the intersection of the center line of the golf club shaft and the sole part. Golf club head. At least one of the first component and the second component is composed of an outer shell-shaped member,
3. The golf club head according to claim 1, wherein, of the outer shell-shaped members, a thickness of a member in the vicinity of the joining position is thinner than a thickness of a member in the vicinity of the joining position. At least one of the first component and the second component is composed of an outer shell-shaped member,
The elastic modulus of the member in the vicinity of the joining position among the outer shell-shaped members is lower than the elastic modulus of the member in the vicinity other than the vicinity of the joining position. Golf club head. The second component part is an outer shell-shaped head body including a crown part having an opening for penetrating the hosel part, a face surface, a sole part, and a side part,
When the golf ball striking direction is the front, the first component portion includes a hosel portion having one end inside the outer shell-shaped head body that penetrates the opening, and a rear end from one end of the hosel portion. 5. The golf club head according to claim 1, further comprising a connecting plate that extends and contacts the inner wall surface of the side portion to create the joining position. 6.   The golf club head according to claim 5, wherein an elastic body is interposed between the opening and the hosel portion passing through the opening.   5. The golf club head according to claim 1, wherein a first component including a sole portion and a hosel portion, a second component including a face surface, and the sole portion as a bottom portion. And when the golf ball hitting direction is the front, there is a gap formed from the lower part of the face surface toward the rear, and the first component and the second component are A golf club head characterized by being joined at a position on the rear side of the gap.   The golf club head according to claim 7, wherein a sheet-like elastic body is interposed in the gap portion. When the golf ball hitting direction is the front, the second component portion has a three-dimensional shape with the face surface as the front end.
The first component part has an outer shell shape including a hosel part, a crown part, a side part, and a sole part formed so as to cover the second component part other than the face surface,
The second component part is partially joined to the inner wall surface of the crown part, the side part or the sole part of the first component part, and the inner wall surface of the first component part and the second component part 5. The golf club head according to claim 1, wherein a gap is formed between the outer surface of the constituent parts of the golf club head. When the golf ball hitting direction is the front, the first component part is an integrated part of the hosel part, the main part of the crown part, the rear part of the sole part, and the rear part of the side part. And
The second component part is obtained by integrating the face surface, a part of the front part of the crown part, a part of the front part of the sole part, and a part of the front part of the side part,
The joining position is provided in a sole portion of the golf club head, and a gap is formed by a part of the second component portion in front of the crown portion and a main portion of the crown portion. The golf club head according to any one of claims 1 to 4.   The golf club head according to claim 9, wherein an elastic body is inserted in the gap.   The golf club head according to any one of claims 6, 8, and 11, wherein the elastic body has a tensile elastic modulus of 80 GPa or less.

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