JP2022046371A - Golf club head - Google Patents

Abstract

To provide a golf club head that has a high degree of freedom of design, and is excellent in joint strength of a fixing member with respect to a head body.SOLUTION: A hollow head 2 comprises a head body m1 and a fixing member f1. The head body m1 is formed of a first material, and the fixing member f1 is formed of a second material. The fixing member f1 is arranged inside a body opening part p1 of the head body m1. At least a portion of the outer peripheral edge part 26 is joined to an inner peripheral edge part 30 of the body opening part p1. The inner peripheral edge part 30 comprises a first engagement part E1 consisting of at least one recessed part or projecting part, and a step part E4. The outer peripheral edge part 26 comprises a second engagement part E2 consisting of at least one recessed part or projecting part, and an outer surface forming projection part E3. Recess-projection fitting is formed between the first engagement part E1 and the second engagement part E2. The outer surface forming projection part E3 engages with the step part E4.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to golf club heads.

A golf club head in which a metal body made of a metal different from the head body is fixed to a metal head body is known. Japanese Unexamined Patent Publication No. 60-241466 discloses a head in which a dissimilar metal body having a melting point different from that of the head body and a higher specific density than the head body is fixed by galvanic corrosion only in the hitting portion of the head body.

Japanese Unexamined Patent Publication No. 60-2414666

By attaching a member whose material is different from that of the head body to the head body, the degree of freedom in designing the position of the center of gravity of the head is increased. On the other hand, due to the difference in material, the bonding strength of this member with respect to the head body tends to decrease.

One of the objects of the present disclosure is to provide a golf club head having a high degree of freedom in design and excellent bonding strength of a fixing member to the head body.

In one embodiment, the golf club head has a hollow portion, a sole portion, and a striking face portion. This head has a head main body and a fixing member fixed to the head main body. The head body is made of a first material having a first specific density. The fixing member is made of a second material having a second specific gravity. The head body has a body opening that penetrates between the outside of the head and the hollow portion. The fixing member is arranged inside the main body opening while forming an inner surface and an outer surface of the head. At least a part of the outer peripheral edge portion of the fixing member is joined to the inner peripheral edge portion of the main body opening to form a joint portion. The inner peripheral edge portion of the main body opening has a first engaging portion formed of at least one convex portion or a concave portion, and a step portion formed on the outer surface side of the head. The outer peripheral edge portion of the fixing member has a second engaging portion formed of at least one convex portion or concave portion, and an outer surface forming convex portion formed of at least one convex portion and constituting the outer surface of the head. is doing. The inner peripheral edge portion and the outer peripheral edge portion are joined by forming an uneven fitting between the first engaging portion and the second engaging portion. The outer surface forming convex portion is engaged with the step portion.

As one aspect, a golf club head having a high degree of freedom in design and excellent bonding strength of a fixing member to the head body can be provided.

FIG. 1 is a plan view of the golf club head of the first embodiment. FIG. 2 is a bottom view of the head of FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a cross-sectional view taken along the line BB of FIG. FIG. 5 is an enlarged cross-sectional view in which the vicinity of the fixing member in FIG. 3 is enlarged. FIG. 6 is an enlarged cross-sectional view of the vicinity of the fixing member in the head of the second embodiment. FIG. 7 is an enlarged cross-sectional view of the vicinity of the fixing member in the head of the third embodiment. FIG. 8 is an enlarged cross-sectional view of the vicinity of the fixing member in the head of the fourth embodiment. FIG. 9 is an enlarged cross-sectional view of the vicinity of the fixing member in the head of the fifth embodiment. 10 (a) is a plan view of the fixing member of the first embodiment, FIG. 10 (b) is a plan view of the fixing member of the sixth embodiment, and FIG. 10 (c) is a plan view of the fixing member of the seventh embodiment. It is a plan view of the member, and FIG. 10D is a plan view of the fixing member of the eighth embodiment. FIG. 11 is a conceptual diagram for explaining the toe-heel direction and the face-back direction.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate.

In the present application, a reference state, a reference vertical plane, a toe-heel direction, a face-back direction, a vertical direction, a face center, and a plan view are defined.

The state in which the head is placed on the horizontal plane HP at a predetermined lie angle and real loft angle is defined as a reference state. As shown in FIG. 11, in this reference state, the plane VP perpendicular to the horizontal plane HP includes the centerline Z of the hosel hole. The plane VP is a reference vertical plane. Predetermined lie angles and real loft angles are listed, for example, in product catalogs.

In the present application, the toe-heel direction is the direction of the line of intersection NL between the reference vertical plane VP and the horizontal plane HP (see FIG. 11).

In the present application, the face-back direction is a direction perpendicular to the toe-heel direction and parallel to the horizontal plane HP.

In the present application, the vertical direction is a direction perpendicular to the toe-heel direction and perpendicular to the face-back direction. In other words, in the present application, the vertical direction is a direction perpendicular to the horizontal plane HP. "Upper" and "lower" in the present application are determined based on this vertical direction.

In the present application, the face center is determined as follows. First, in the vertical direction and the toe-heel direction, an arbitrary point Pr near the center of the face surface is selected. Next, a plane that passes through this point Pr, extends along the normal direction of the face surface at the point Pr, and is parallel to the toe-heel direction is determined. A line of intersection between this plane and the face surface is drawn, and its midpoint Px is determined. Next, a plane that passes through the midpoint Px, extends along the normal direction of the face surface at the point Px, and is parallel to the vertical direction is determined. A line of intersection between this plane and the face surface is drawn, and its midpoint Py is determined. Next, a plane that passes through this midpoint Py, extends along the normal direction of the face surface at the point Py, and is parallel to the toe-heel direction is determined. A line of intersection between this plane and the face surface is drawn, and its midpoint Px is newly determined. Next, a plane that passes through this new midpoint Px, extends along the normal direction of the face surface at the point Px, and is parallel to the vertical direction is determined. A line of intersection between this plane and the face surface is drawn, and its midpoint Py is newly determined. By repeating this step, Px and Py are sequentially determined. During the repetition of this process, the new position Py (last position Py) when the distance between the new midpoint Py and the immediately preceding midpoint Py is 0.5 mm or less for the first time is determined. It is a face center.

In the present application, the plan view means a projection drawing (vertical projection drawing) on a plane parallel to the horizontal plane HP.

[First Embodiment]
1 is a plan view of the golf club head 2 of the first embodiment, FIG. 2 is a bottom view of the head 2, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. Is a cross-sectional view taken along the line BB of FIG.

The head 2 has a striking face portion 4, a crown portion 6, a sole portion 8, and a hosel portion 10. The hosel portion 10 has a hosel hole 12.

The head 2 is a wood type head. The head 2 is a fairway wood head. Examples of the head 2 include a fairway wood head, a hybrid head, a driver head, and an iron head.

As shown in FIGS. 3 and 4, the head 2 has a hollow portion k1. The head 2 is a hollow golf club head.

The striking face portion 4 has a face outer surface 4a and a face inner surface 4b. The face outer surface 4a constitutes the outer surface 2a of the head 2. The face outer surface 4a is also referred to as a face surface. The face outer surface 4a has a face center Fc. The inner surface 4b of the face constitutes the inner surface 2b of the head 2. The inner surface 4b of the face faces the hollow portion k1. The crown portion 6 has a crown outer surface 6a and a crown inner surface 6b. The crown outer surface 6a constitutes the outer surface 2a of the head 2. The inner surface 6b of the crown constitutes the inner surface 2b of the head 2. The inner surface 6b of the crown faces the hollow portion k1. The sole portion 8 has a sole outer surface 8a and a sole inner surface 8b. The sole outer surface 8a constitutes the outer surface 2a of the head 2. The inner surface 8b of the sole constitutes the inner surface 2b of the head 2. The inner surface 8b of the sole faces the hollow portion k1.

The head 2 has a head main body m1 and a fixing member f1. The head body m1 constitutes the entire striking face portion 4. The head body m1 constitutes the entire crown portion 6. The head body m1 constitutes a part of the sole portion 8. The sole portion 8 is composed of a head main body m1 and a fixing member f1. The head body m1 constitutes the entire hosel portion 10.

The head body m1 has an opening p1. The opening p1 is also referred to as a main body opening. The main body opening p1 is provided in the sole portion 8. The main body opening p1 forms a through hole penetrating the head main body m1. The main body opening p1 forms a through hole penetrating from the outer surface 2a of the head 2 to the inner surface 2b of the head 2. The main body opening p1 forms a through hole penetrating from the outside of the head 2 to the hollow portion k1. The main body opening p1 forms a through hole penetrating the sole portion 8. The main body opening p1 forms a through hole penetrating from the outer surface 8a of the sole to the inner surface 8b of the sole.

The fixing member f1 is fixed to the head main body m1. The fixing member f1 is not welded to the head body m1. The fixing member f1 is not adhered to the head body m1. The method of fixing the fixing member f1 will be described later. The fixing member f1 is arranged inside the main body opening p1. The fixing member f1 is fixed to the inside of the main body opening p1. The fixing member f1 closes the through hole of the main body opening p1. The fixing member f1 is formed separately from the head main body m1. The center of gravity of the fixing member f1 is located on the heel side of the face center Fc.

The outer surface 20 of the fixing member f1 constitutes the outer surface 2a of the head 2. The outer surface 20 of the fixing member f1 constitutes the sole outer surface 8a. The inner surface 22 of the fixing member f1 constitutes the inner surface 2b of the head 2. The inner surface 22 of the fixing member f1 constitutes the inner surface 8b of the sole. The inner surface 22 of the fixing member f1 faces the hollow portion k1. In the present embodiment in which the fixing member f1 is arranged on the sole portion 8, the inner surface 22 of the fixing member f1 is the upper surface of the fixing member f1, and the outer surface 20 of the fixing member f1 is the lower surface of the fixing member f1.

FIG. 5 is a partially enlarged cross-sectional view of FIG. FIG. 5 is an enlarged cross-sectional view of the vicinity of the fixing member f1.

The fixing member f1 has an outer peripheral edge portion 26. The outer peripheral edge portion 26 has an engaging portion E2 composed of at least one convex portion or concave portion. The engaging portion E2 of the outer peripheral edge portion 26 is also referred to as a second engaging portion and is distinguished from the first engaging portion described later. In the present embodiment, the second engaging portion E2 is a convex portion. As shown by the broken line in FIG. 2, there are three second engaging portions E2. The three second engaging portions E2 are the second engaging portion E21 formed on the face side of the fixing member f1, the second engaging portion E22 formed on the toe side of the fixing member f1, and the fixing member f1. It is a second engaging portion E23 formed on the heel side.

The second engaging portion E2 is provided on the side surface 28 of the fixing member f1. The second engaging portion E2 is arranged at an intermediate position in the thickness direction of the fixing member f1. The second engaging portion E2 is arranged at an intermediate position in the thickness direction of the sole portion 8. The thickness direction of the sole portion 8 is the vertical direction. The second engaging portion E2 is separated from the outer surface 8a of the sole. The second engaging portion E2 is located above the outer surface 8a of the sole. The second engaging portion E2 is separated from the outer surface 20 of the fixing member f1. The second engaging portion E2 is located inside the head with respect to the outer surface 20. The second engaging portion E2 is separated from the inner surface 8b of the sole. The second engaging portion E2 is located below the inner surface 8b of the sole. The second engaging portion E2 is separated from the inner surface 22 of the fixing member f1. The second engaging portion E2 is located outside the head with respect to the inner surface 22.

The main body opening p1 of the head main body m1 has an inner peripheral edge portion 30. The inner peripheral edge portion 30 has an engaging portion E1 composed of at least one convex portion or concave portion. The engaging portion E1 of the inner peripheral edge portion 30 is also referred to as a first engaging portion. In the present embodiment, the first engaging portion E1 is a recess. As shown by the broken line in FIG. 2, there are three first engaging portions E1. The three first engaging portions E1 include a first engaging portion E11 joined to the second engaging portion E21, a first engaging portion E12 joined to the second engaging portion E22, and a second engaging portion. It is a first engaging portion E13 joined to the portion E23.

An uneven fit is formed between the first engaging portion E1 and the second engaging portion E2. The uneven fitting is formed by fitting the convex portion into the concave portion. By forming this uneven fitting, the outer peripheral edge portion 26 and the inner peripheral edge portion 30 are joined. As in the present embodiment, when the second engaging portion E2 is a convex portion, the first engaging portion E1 is a concave portion. When the second engaging portion E2 is a concave portion, the first engaging portion E1 is a convex portion. Concavo-convex fitting is formed by fitting the convex portion into the concave portion.

The uneven fitting between the first engaging portion E1 and the second engaging portion E2 is formed by casting. The fixing member f1 is fixed to the head main body m1 by a casting. The fixing member f1 is integrated with the head main body m1 by a casting. By casting the fixing member f1 with the head main body m1, uneven fitting between the first engaging portion E1 and the second engaging portion E2 is formed. The method of forming the uneven fitting is not limited to the casting. As a method other than casting, for example, press-fitting can be mentioned. Further, as described later, the material of the fixing member does not have to be metal, and uneven fitting can be formed by various methods.

In this way, at least a part of the outer peripheral edge portion 26 is joined to the inner peripheral edge portion 30 of the main body opening p1. In the present embodiment, a part of the outer peripheral edge portion 26 is joined to the inner peripheral edge portion 30 of the main body opening p1. The joint portion 32 is formed by this joint.

The fixing member f1 has a groove forming portion 34. The groove forming portion 34 is formed on the outer surface 20 of the fixing member f1. The groove forming portion 34 is formed at the edge portion of the outer surface 20. The groove forming portion 34 forms the groove 36 in combination with the adjacent inner peripheral edge portion 30. A filler can be put in the groove 36. With this filler, the aesthetic appearance of the boundary between the fixing member f1 and the head body m1 can be enhanced. This filler can be a paint. With this paint, the presence of the fixing member f1 can be made conspicuous and the design of the head can be improved. By providing the groove forming portion 34 not on the head main body m1 side but on the fixing member f1 side, it is possible to prevent the strength of the head main body m1 from decreasing.

The fixing member f1 has an outer surface forming convex portion E3. The outer surface forming convex portion E3 is provided on the side surface 28. The outer surface forming convex portion E3 is a convex portion provided on the side surface 28. The outer surface forming convex portion E3 is provided at the end portion of the side surface 28 on the outer side of the head. The outer surface forming convex portion E3 is provided at the lower end portion of the side surface 28. In the head 2, the outer surface forming convex portion E3 is exposed. The outer surface forming convex portion E3 constitutes the outer surface 2a of the head 2. The outer surface forming convex portion E3 constitutes the outer surface 20 of the fixing member f1. The outer surface of the main body of the fixing member f1 and the outer surface of the outer surface forming convex portion E3 are connected flush with each other. The main body portion of the fixing member f1 is a portion of the fixing member f1 inside the side surface 28.

The inner peripheral edge portion 30 of the head main body m1 has a step portion E4. The step portion E4 is a recess provided on the side surface 38 of the inner peripheral edge portion 30. The step portion E4 is formed by chipping the outer end portion of the inner peripheral edge portion 30 of the head. The step portion E4 is formed by chipping the lower end portion of the inner peripheral edge portion 30. The shape of the step portion E4 corresponds to the outer surface forming convex portion E3. The step portion E4 is engaged with the outer surface forming convex portion E3.

As shown in FIG. 2, the width Wa of the outer surface forming convex portion E3 is larger than the width Wb of the second engaging portion E2. The width Wa may be smaller than the width Wb. The width Wa may be the same as the width Wb. The width Wa and the width Wb are measured in a plan view.

The engagement between the outer surface forming convex portion E3 and the step portion E4 is formed by casting. By casting the fixing member f1 with the head main body m1, the engagement between the outer surface forming convex portion E3 and the step portion E4 is achieved. The method of forming this engagement is not limited to the casting. The step portion E4 is open downward (outside the head). Therefore, this engagement can be easily achieved by arranging the outer surface forming convex portion E3 from below (outside the head) to the step portion E4.

In this embodiment, the fixing member f1 is arranged on the sole portion 8. In this case, "outside the head" means downward. On the other hand, when the fixing member f1 is arranged on the crown portion 6, the “outside of the head” means the upper side.

The material of the head body m1 is different from the material of the fixing member f1. The head body m1 is formed of a first material having a first specific gravity. The fixing member f1 is made of a second material having a second specific gravity. The first density is different from the second density. The first material is different from the second material.

In this embodiment, the fixing member f1 is a heavy body. In this embodiment, the second specific density is larger than the first specific gravity. By providing the fixing member f1 having a large specific gravity in the sole portion 8, the center of gravity of the head 2 can be lowered.

FIG. 6 is a cross-sectional view of the vicinity of the fixing member f2 in the head of the second embodiment. This head has a head body m2 and a fixing member f2. In the second embodiment, the second engaging portion E2 of the outer peripheral edge portion 26 is a concave portion, and the first engaging portion E1 of the inner peripheral edge portion 30 is a convex portion. Except for this point, the head of the second embodiment is the same as the head 2 of the first embodiment. As described above, in the uneven fitting between the first engaging portion E1 and the second engaging portion E2, the first engaging portion E1 on the head body m2 side is a convex portion, and the second engaging portion on the fixing member f2 side is engaged. The portion E2 may be a recess.

FIG. 7 is a cross-sectional view of the vicinity of the fixing member f3 in the head of the third embodiment. This head has a head main body m3 and a fixing member f3.

As shown in FIG. 5, in the first embodiment, the outer surface forming convex portion E3 is provided on the back side of the fixing member f1, and the second engaging portion E2 is provided on the face side of the fixing member f1. On the other hand, in the third embodiment of FIG. 7, the outer surface forming convex portion E3 is provided on the face side of the fixing member f3, and the second engaging portion E2 is provided on the back side of the fixing member f3. .. As described above, the arrangement of the second engaging portion E2 and the outer surface forming convex portion E3 is not limited.

FIG. 8 is a cross-sectional view of the vicinity of the fixing member f4 in the head of the fourth embodiment. This head has a head body m4 and a fixing member f4.

The inner surface 22 of the fixing member f4 is inclined. The inner surface 22 is inclined so as to have an angle with respect to the face-back direction. The inner surface 22 is inclined so as to be upward toward the face side. The fixing member f4 has a wall thickness changing portion 40 in which the wall thickness t1 increases toward the face side. The wall thickness t1 is measured along the vertical direction.

FIG. 9 is a cross-sectional view of the head of the fifth embodiment in the vicinity of the fixing member f5. This head has a head body m5 and a fixing member f5.

The inner surface 22 of the fixing member f5 has an inclined surface 22a inclined so as to have an angle with respect to the face-back direction. In the present embodiment, the entire inner surface 22 is an inclined surface 22a. The inclined surface 22a is inclined so as to be downward toward the back side. The fixing member f4 has a wall thickness changing portion 42 in which the wall thickness t1 increases toward the face side.

The fixing member f5 has a protruding portion 44 protruding inward of the head. The protruding portion 44 protrudes into the hollow portion k1. The protruding portion 44 protrudes from the inner surface 22 of the fixing member f5. The protruding portion 44 protrudes in the upward direction toward the face side. The tip 44b of the protrusion 44 is a free end. The tip 44b of the protrusion 44 is separated from the head body m5. The tip 44b of the protrusion 44 is separated from the sole portion 8. The end portion 44a of the protruding portion 44 is separated from the head main body m5. The end portion 44a of the protrusion 44 is separated from the sole portion 8. The end portion 44a of the protrusion 44 is a portion of the protrusion 44 on the face side.

The protruding portion 44 has a contact portion 44c that is in contact with the head body m5 and a non-contact portion 44d that is not in contact with the head body m5. The contact portion 44c is a portion at the base of the protrusion 44. The non-contact portion 44d is a portion on the tip side 44b side of the contact portion 44c. The non-contact portion 44d is a portion on the face side of the contact portion 44c. The non-contact portion 44d includes an end portion 44a and a tip portion 44b.

The fixing member f5 sandwiches a part of the head main body m5. The head body m5 has a held portion 46 sandwiched by the fixing member f5. The sole portion 8 has a held portion 46 sandwiched by the fixing member f5. The sandwiched portion 46 is sandwiched between the second engaging portion E2 and the protruding portion 44 (contact portion 44c).

The inner surface 48 of the protrusion 44 is a part of the inclined surface 22a. The inner surface 48 of the protrusion 44 is a part of the inner surface 22. The inner surface 48 of the protrusion 44 is flush with the inner surface of the main body of the fixing member f5. In this embodiment, the inner surface 48 is the upper surface of the protrusion 44. The inner surface 48 is inclined so as to have an angle with respect to the face-back direction. The inner surface 48 is inclined so as to be upward toward the face side. In the present embodiment, the outer surface 50 of the protruding portion 44 is the lower surface of the non-contact portion 44d. The outer surface 50 is inclined so as to have an angle with respect to the face-back direction. The outer surface 50 is inclined so as to be upward toward the face side. The outer surface 50 is parallel to the inner surface 48. The outer surface 50 does not have to be parallel to the inner surface 48.

The embodiments shown above have the following effects.

Since the fixing member and the opening of the main body are mechanically joined by uneven fitting, the joining strength can be increased. Even if the material of the fixing member and the material of the head body are both metals, the weldability of both may be poor. Even in this case, the uneven fitting makes it possible to join the fixing member and the head body.

In each of the above-described embodiments, the fixing member is arranged on the sole portion 8. When the fixing member is a heavy body having a large specific gravity, the center of gravity of the head can be lowered.

By providing the outer surface forming convex portion E3, the fixing member can be arranged on the outer side of the head. Therefore, when the fixing member is a heavy body and is arranged on the sole portion 8, the weight is distributed lower than the outer surface forming convex portion E3, so that the center of gravity of the head can be lowered. Further, the weight is distributed to the outside of the head by the outer surface forming convex portion E3, and the moment of inertia of the head can be increased.

The outer surface forming convex portion E3 is engaged with the step portion E4 of the head body from the outside of the head. This engagement suppresses the movement of the fixing member inward of the head. Therefore, it is possible to prevent the fixing member from coming off the head body. When the fixing member is provided on the sole portion 8, an external force toward the inside of the head tends to act on the fixing member. For example, when the sole portion 8 hits the ground or the like, an external force toward the inside of the head acts on the fixing member. With respect to this external force, the outer surface forming convex portion E3 engaged with the step portion E4 can effectively suppress the movement of the fixing member inward to the head.

When the fixing member is a heavy body and is arranged on the crown portion 6, the weight is distributed higher than the outer surface forming convex portion E3, and the center of gravity of the head can be made higher. Further, the weight is distributed to the outside of the head by the outer surface forming convex portion E3, and the moment of inertia of the head can be increased.

When the fixing member is a lightweight body having a small specific gravity, the excess weight can be increased by the outer surface forming convex portion E3. Therefore, the degree of freedom in weight distribution of the head can be increased. When the fixing member is a lightweight body and is arranged on the sole portion 8, the weight of the lower side of the head is lighter than that of the outer surface forming convex portion E3, and the center of gravity of the head can be made higher. When the fixing member is a lightweight body having a small specific gravity and is arranged on the crown portion 6, the weight on the upper side of the head is lighter than that of the outer surface forming convex portion E3, and the center of gravity of the head can be made lower.

In this way, by making the specific gravity of the fixing member different from the specific gravity of the head body and providing the outer surface forming convex portion E3, the degree of freedom in designing the head can be increased.

Usually, when the difference in specific gravity between the material of the fixing member and the material of the head body is large, the weldability is deteriorated. However, the uneven fitting enables joining even if the difference in specific gravity is large. Therefore, for example, the fixing member can be a heavy body, the weight of the heavy body can be increased, and the head can be effectively made to have a low center of gravity. Further, the fixing member can be made lightweight, and for example, the created surplus weight can be arranged in another portion of the head. By increasing the difference between the specific gravity of the fixing member and the specific gravity of the head body, the degree of freedom in designing the head can be increased.

In each of the above-described embodiments, the fixing member replaces a part of the sole portion 8. That is, the outer surface 20 of the fixing member constitutes the sole outer surface 8a (outer surface 2a of the head 2), and the inner surface 22 of the fixing member constitutes the sole inner surface 8b (inner surface 2b of the head 2). The fixing member is not backed up by the head body. The fixing member penetrates the sole portion 8. The fixing member occupies the entire thickness direction of the sole portion 8. A part of the sole portion 8 (the wall portion constituting the outer surface 2a and the inner surface 2b of the head 2) is composed of only a fixing member. With this structure, the effect caused by the difference in specific gravity between the head body and the fixing member is further enhanced. That is, when the fixing member is a heavy body, the weight of the region where the fixing member is arranged can be increased, and when the heavy body is arranged on the sole portion 8, the effect of lowering the center of gravity of the head is enhanced. .. Further, when the fixing member is a lightweight member, the weight of the region where the fixing member is arranged can be reduced, and the excess weight can be increased by this weight reduction.

The fixing member f4 of FIG. 8 and the fixing member f5 of FIG. 9 are thick on the face side and thin on the back side. Therefore, when the fixing member is arranged on the sole portion 8 and used as a heavy body, the center of gravity of the head can be effectively shallow and lowered. As a result, the sweet spot can be effectively lowered. "The center of gravity of the head is shallow" means that the center of gravity of the head is closer to the face portion 4.

The low sweet spot brings the RBI closer to the sweet spot. Low sweet spots are advantageous in clubs that often hit balls placed directly on the ground. Low sweet spots are especially useful on fairway woods and hybrids. The sweet spot is an intersection of the normal of the face surface 4a passing through the center of gravity of the head and the face surface 4a.

In the fixing member f5 of FIG. 9, the weight is distributed to the face side by the protruding portion 44 extending toward the face side. Therefore, the center of gravity of the head can be made shallow, and the sweet spot can be lowered. It should be noted that the protrusion of the protruding portion 44 upward may act in the direction of raising the center of gravity of the head, but this may be offset by the outer surface forming convex portion E3 acting in the direction of lowering the center of gravity of the head. As a result, the protrusion 44 can contribute to lowering the sweet spot.

The face-side portion (non-contact portion 44d) of the protruding portion 44 is not in contact with the sole portion 8 (head body m5). At the time of impact, the deformation of the sole portion 8 (head body m5) in the portion close to the face portion 4 is not hindered by the protruding portion 44. As a result, the repulsive performance of the head can be improved.

The fixing member f5 in FIG. 9 sandwiches a part of the head 2 (sole portion 8). Therefore, deformation of the wall portion (sole portion 8) of the head in the out-of-plane direction is suppressed. Further, it is suppressed that the fixing member f5 comes off from the head main body m5.

FIG. 10A is a plan view of the fixing member f1 according to the first embodiment. FIG. 10A is a plan view of the fixing member f1 as viewed from above (hollow portion k1 side). As described above, the fixing member f1 has a plurality of second engaging portions E2. The fixing member f1 is fixed to the second engaging portion E21 formed on the face side of the fixing member f1 and the second engaging portion E22 formed on the toe side of the fixing member f1 as the second engaging portion E2. It has a second engaging portion E23 formed on the heel side of the member f1. The outer surface forming convex portion E3 is one. The outer surface forming convex portion E3 is provided on the back side of the fixing member f1.

FIG. 10B is a plan view of the fixing member f6 according to the sixth embodiment. The fixing member f6 has one second engaging portion E2. The second engaging portion E2 is provided on the face side of the outer peripheral edge portion 26. The fixing member f6 has one outer surface forming convex portion E3. The outer surface forming convex portion E3 continuously extends from the toe side of the outer peripheral edge portion 26 to the heel side via the back side. The outer surface forming convex portion E3 is curved and extends.

FIG. 10 (c) is a plan view of the fixing member f7 according to the seventh embodiment. The fixing member f7 has one second engaging portion E2. The second engaging portion E2 is provided on the face side of the outer peripheral edge portion 26. The fixing member f6 has one outer surface forming convex portion E3. The outer surface forming convex portion E3 is provided on the back side of the outer peripheral edge portion 26.

FIG. 10D is a plan view of the fixing member f8 according to the eighth embodiment. The fixing member f8 has one second engaging portion E2. The second engaging portion E2 extends continuously from the toe side of the outer peripheral edge portion 26 to the heel side via the face side. The second engaging portion E2 is bent and extends. The fixing member f6 has one outer surface forming convex portion E3. The outer surface forming convex portion E3 is provided on the back side of the outer peripheral edge portion 26.

As shown in FIGS. 10A to 10D, the number and arrangement of the second engaging portion E2 and the outer surface forming convex portion E3 are not limited.

In FIGS. 10A to 10D, the second engaging portion E2 is formed along the outer peripheral edge portion 26. Of these, in FIGS. 10A and 10D, the outer edge ED2 of the second engaging portion E2 is formed so as to pass through at least three locations that are not in a straight line in a plan view. Therefore, it is possible to suppress the deformation of the sole portion 8 in the fixing member in the out-of-plane direction, and it is possible to prevent the fixing member from coming off the sole portion 8. The out-of-plane direction of the sole portion 8 is substantially equal to the vertical direction. This effect is achieved regardless of the position of the fixing member. For example, this effect is exhibited even when the fixing member is arranged on the crown portion 6. That is, in this case, the deformation of the crown portion 6 in the fixing member in the out-of-plane direction can be suppressed, and the fixing member is suppressed from coming off the crown portion 6.

In the fixing member f1 of FIG. 10A, the second engaging portion E2 is intermittently formed. As a result, in the fixing member f1, a plurality of independent fixing members f1 are formed. In this case, the existing region of the second engaging portion E2 can be reduced while providing the second engaging portion E2 at a plurality of locations. By reducing the existing region of the second engaging portion E2, the degree of freedom in arranging the outer surface forming convex portion E3 can be increased.

Comparing the fixing member f1 of FIG. 5 and the fixing member f3 of FIG. 7, the fixing member f1 is provided with the outer surface forming convex portion E3 on the back side, whereas the fixing member f3 has the outer surface forming convex portion E3. It is provided on the face side. When the fixing member is provided on the sole portion 8 and the outer surface forming convex portion E3 is provided on the back side, more weight can be arranged on the back side and the lower side. In this case, the position of the center of gravity of the head can be lowered and deepened. A large depth of center of gravity contributes to increasing the launch angle. When the fixing member is provided on the sole portion 8 and the outer surface forming convex portion E3 is provided on the face side, more weight can be arranged on the face side and the lower side. In this case, the position of the center of gravity of the head can be made low and shallow. Since the position of the center of gravity of the head is closer to the face, the sweet spot can be lowered.

As described above, in the head 2, the fixing member f1 is fixed to the head main body m1 by a casting. The fixing member f1 is formed separately from the head main body m1. The molding method of the fixing member f1 is not limited, and examples thereof include sintering, forging, casting, and pressing. The manufacturing method of the head body m1 is not limited, and examples thereof include forging, casting, and pressing. When the fixing member f1 is fixed by casting, the head body m1 is formed by casting. In this case, preferably, the head body m1 is formed by lost wax casting (lost wax precision casting).

When the fixing member f1 is cast in lost wax casting, the fixing member f1 is inserted into a wax mold to perform wax molding, and a wax model in which the fixing member f1 is incorporated is created. After that, by performing a normal process, a head in which the fixing member f1 is fixed by casting is formed.

Joining by casting has a high degree of freedom in shape at the joint. By using the casting, the degree of freedom in the shape of the concave portion and the convex portion in the concave-convex fitting is increased, and the concave-convex fitting can be formed even in the deep concave portion and the high convex portion. The casting allows for a strong bond in uneven fitting.

When the material of the fixing member f1 is resin, the head main body m1 can be inserted into a mold to inject and mold the resin. Also in this case, the degree of freedom in the shape of the concave portion and the convex portion in the uneven fitting is high.

As described above, the head body is made of a first material having a first specific density. The fixing member is made of a second material having a second specific density.

The first material is not limited, and metal, non-metal and combinations thereof are exemplified. Examples of the metal include titanium alloys, stainless steels, maraging steels, aluminum alloys and magnesium alloys. As a non-metal, a fiber reinforced resin is exemplified. From the viewpoint of strength, a carbon fiber reinforced resin is mentioned as a preferable fiber reinforced resin. In the head body m1 of the above embodiment, the first material is a titanium alloy.

The second material is not limited, and metal, non-metal and combinations thereof are exemplified. Examples of the metal include alloys containing tungsten, titanium alloys, stainless steels, maraging steels, aluminum alloys and magnesium alloys. Examples of the tungsten alloy include an alloy obtained by adding nickel, iron, and / or copper to tungsten powder and sintering the alloy, and examples thereof include a tungsten nickel alloy. Resin is exemplified as a non-metal. A fiber reinforced resin is mentioned as a preferable resin. From the viewpoint of strength, a carbon fiber reinforced resin is mentioned as a preferable fiber reinforced resin. In the fixing member f1 of the above embodiment, the second material is an alloy containing tungsten. In the fixing member f1, a tungsten nickel alloy is used as the alloy containing tungsten.

The specific gravity of the head body (first specific gravity) is S1, and the specific gravity of the fixing member (second specific gravity) is S2. When the fixing member is used as a heavy body, the difference (S2-S1) is preferably 5 or more, more preferably 6 or more, and more preferably 7 or more. Even when the difference in specific gravity is large and the weldability is poor, joining is possible due to the above structure. Considering the available first and second materials, the difference (S2-S1) is preferably 15 or less, more preferably 14 or less, and even more preferably 13 or less. When the fixing member is used as a lightweight member, the difference (S1-S2) is preferably 2 or more, more preferably 2.5 or more, and more preferably 3 or more. Even when the difference in specific gravity is large and the weldability is poor, joining is possible due to the above structure. Considering the available first and second materials, the difference (S1-S2) is preferably 8 or less, more preferably 7 or less, and even more preferably 6 or less.

When the fixing member is used as a heavy body, the second specific gravity S2 is increased. When increasing the second specific density S2, an alloy containing tungsten is exemplified as the second material. When the second specific density S2 is made larger than the first specific gravity S1, the second specific gravity S2 is preferably 10 or more, more preferably 11 or more, and more preferably 12 or more. Considering the availability of materials and the molding cost, the second specific density S2 is preferably 20 or less, more preferably 19 or less, and more preferably 18 or less.

When it is desired to make the fixing member f1 lighter, the second specific gravity S2 is reduced. Examples of the second material in this case include aluminum alloys, magnesium alloys and fiber reinforced resins. When the second specific gravity S2 is made smaller than the first specific gravity S1, the second specific gravity S2 is preferably 4.5 or less, more preferably 4 or less, and more preferably 3 or less. Considering the strength of the fixing member f1, the second specific gravity S2 is preferably 1 or more, more preferably 1.1 or more, and more preferably 1.2 or more.

Considering a material having strength suitable for the head body, the first specific gravity S1 is preferably 2 or more, more preferably 3 or more, and more preferably 4 or more. If the first specific gravity S1 is excessive, the degree of freedom in designing the head is reduced. From this viewpoint, the first specific gravity S1 is preferably 8 or less, more preferably 7 or less, and even more preferably 6 or less.

As described above, even when the weldability between the fixing member f1 and the head main body m1 is poor, the fixing member f1 can be joined to the head main body m1 by the above structure. From the viewpoint of the degree of freedom in selecting the material of the fixing member f1, when the first material (head body m1) and the second material (fixing member f1) are made of metal, the weldability between the first material and the second material is poor. Is preferable.

Poor weldability can be judged from the metal composition. When one or more selected from the group consisting of the following (A), (B), (C) and (D) is satisfied, the weldability tends to deteriorate.
(A) The component having the maximum weight ratio in the first material and the component having the maximum weight ratio in the second material are different.
(B) When at least one common component commonly contained in the first material and the second material is present, the ratio Rc1 (% by weight) of the common component in the first material is 30% by weight or less, further 20 By weight% or less, further 10% by mass or less, further 5% by weight or less, further 3% by weight or less, and further 1% by weight or less. When there are two or more common components, the ratio Rc1 is the sum of the ratios of each component.
(C) When at least one common component commonly contained in the first material and the second material is present, the ratio Rc2 (% by weight) of the common component in the second material is 30% by weight or less, further 20 By weight% or less, further 10% by mass or less, further 5% by weight or less, further 3% by weight or less, and further 1% by weight or less. When there are two or more common components, the ratio Rc2 is the sum of the ratios of each component.
(D) There is no common component commonly contained in the first material and the second material.

From the viewpoint of the strength of the fixing member, the wall thickness t1 of the fixing member is preferably 2.0 mm or more, more preferably 2.5 mm or more, and more preferably 3.0 mm or more. If the wall thickness t1 is excessive, the fixing member expands inward of the head, and the effect of the outer surface forming convex portion provided on the outer side of the head may be reduced. From this viewpoint, the wall thickness t1 is preferably 6.0 mm or less, more preferably 5.5 mm or less, and even more preferably 5.0 mm or less.

The position of the fixing member is not limited. The fixing member may be arranged on the sole portion 8, the crown portion 6, or the striking face portion 4. The fixing member may be arranged in the region from the crown portion 6 to the sole portion 8. In a head having a side portion (skirt portion) between the crown portion 6 and the sole portion 8, a fixing member may be arranged on the side portion (skirt portion).

FIG. 2 shows a plan view of the sole portion 8. When the fixing member f1 is provided on the sole portion 8, the area of the fixing member f1 in the area of the sole outer surface 8a is not limited. From the viewpoint of enhancing the above-mentioned effect caused by the fixing member f1, the ratio of the area of the fixing member f1 to the area of the outer surface 8a of the sole is preferably 5% or more, more preferably 7% or more, and more preferably 9% or more. Considering the strength of the head 2, it is not preferable that the main body opening p1 becomes excessive. From this viewpoint, the ratio of the area of the fixing member f1 to the area of the outer surface 8a of the sole is preferably 60% or less, more preferably 50% or less, and even more preferably 40% or less. The proportion of this area is determined in plan view.

The head volume is not limited. Fairway woods and hybrids have the great advantage of lowering the sweet spot. From this viewpoint, the head volume is preferably 300 cc or less, more preferably 250 cc or less, and even more preferably 200 cc or less. From the viewpoint of the degree of freedom in the position of the fixing member, the head volume is preferably 70 cc or more, more preferably 80 cc or more, and more preferably 90 cc or more.

The type of the hollow head is not limited, and wood type, hybrid type, iron type and putter type are exemplified.

Examples of the wood type head include a driver head and a fairway wood head.

The driver means the first wood (W # 1). The driver head usually has a curved face outer surface. The outer surface of the face of this curved surface has a face bulge and a face roll. Typically, the volume of the driver head is 300 cc or more and 460 cc or less. Typically, the real loft of the driver head is 7 degrees or more and 14 degrees or less.

As fairway woods, 3rd wood (W # 3), 4th wood (W # 4), 5th wood (W # 5), 7th wood (W # 7), 9th wood (W # 9), 11 No. 1 wood (W # 11) and No. 13 wood (W # 13) are exemplified. The fairway wood head has a curved face outer surface. This face outer surface has a face bulge and a face roll. Typically, the volume of the fairway wood head is 100 cc or more and less than 300 cc, and more preferably 100 cc or more and 200 cc or less. Typically, the real loft of the fairway wood head is greater than 14 degrees and less than 33 degrees.

The hybrid head usually has a curved face outer surface. This face outer surface has a face bulge and a face roll. Typically, the volume of the hybrid head is 100 cc or more and 200 cc or less, preferably 100 cc or more and 150 cc or less.

Iron-type heads usually have a flat face outer surface. The iron-type hollow head is also called an iron-type hybrid head.

From the viewpoint of the effectiveness of the low sweet spot, fairway wood heads and hybrid heads are preferable. From the viewpoint of the degree of freedom in the position of the fixing member, a driver head and a fairway wood head are preferable.

The following appendices are disclosed with respect to the above-described embodiment.
[Appendix 1]
A golf club head having a hollow portion, a sole portion, and a striking face portion.
It has a head body and a fixing member fixed to the head body.
The head body is made of a first material having a first specific density.
The fixing member is formed of a second material having a second specific gravity.
The head body has a body opening that penetrates between the outside of the head and the hollow portion.
The fixing member is arranged inside the main body opening while forming an inner surface and an outer surface of the head.
At least a part of the outer peripheral edge portion of the fixing member is joined to the inner peripheral edge portion of the main body opening to form a joint portion.
The inner peripheral edge portion of the main body opening has a first engaging portion formed of at least one convex portion or a concave portion, and a step portion formed on the outer surface side of the head.
The outer peripheral edge portion of the fixing member includes a second engaging portion formed of at least one convex portion or a concave portion, and an outer surface forming convex portion formed of at least one convex portion and forming an outer surface of the head.
Have and
By forming an uneven fit between the first engaging portion and the second engaging portion, the inner peripheral edge portion and the outer peripheral edge portion are joined to each other.
A golf club head in which the outer surface forming convex portion is engaged with the step portion.
[Appendix 2]
The main body opening is provided in the sole portion, and the main body opening is provided in the sole portion.
The inner surface of the fixing member constitutes the inner surface of the sole portion.
The outer surface of the fixing member constitutes the outer surface of the sole portion.
The golf club head according to Appendix 1, wherein the outer surface forming convex portion constitutes the outer surface of the sole portion.
[Appendix 3]
The second engaging portion is formed along the outer peripheral edge portion.
The golf club head according to Supplementary Note 1 or 2, wherein the second engaging portion is formed intermittently.
[Appendix 4]
The golf club head according to any one of Supplementary note 1 to 3, wherein the outer edge of the second engaging portion is formed so as to pass through at least three places that are not in a straight line in a plan view.
[Appendix 5]
The golf club head according to any one of Supplementary note 1 to 4, wherein the fixing member is fixed to the head body by a casting.
[Appendix 6]
The golf club head according to any one of Supplementary note 1 to 5, wherein the second specific gravity is larger than the first specific gravity.
[Appendix 7]
The golf club head according to any one of Supplementary note 1 to 6, wherein the first material is a titanium alloy and the second material is an alloy containing tungsten.

2 ... Golf club head 4 ... Hitting face part 4a ... Face outer surface 4b ... Face inner surface 6 ... Crown part 6a ... Crown outer surface 6b ... Crown inner surface 8 ... Sole part 8a ・ ・ ・ Sole outer surface 8b ・ ・ ・ Sole inner surface 10 ・ ・ ・ Hosel part 12 ・ ・ ・ Hosel hole 20 ・ ・ ・ Fixed member outer surface 22 ・ ・ ・ Fixed member inner surface 26 ・ ・ ・ Outer peripheral edge part 28 ・ ・ ・・ Side surface of fixing member 30 ・ ・ ・ Inner peripheral edge of main body opening 32 ・ ・ ・ Joint part m1 ～ m5 ・ ・ ・ Head body f1 ～ f8 ・ ・ ・ Fixed member k1 ・ ・ ・ Hollow part E1 ・ ・ ・ First Engagement part E2 ・ ・ ・ Second engagement part E3 ・ ・ ・ Outer surface forming convex part E4 ・ ・ ・ Step part

Claims (7)

A golf club head having a hollow portion, a sole portion, and a striking face portion.
It has a head body and a fixing member fixed to the head body.
The head body is made of a first material having a first specific density.
The fixing member is formed of a second material having a second specific gravity.
The head body has a body opening that penetrates between the outside of the head and the hollow portion.
The fixing member is arranged inside the main body opening while forming an inner surface and an outer surface of the head.
At least a part of the outer peripheral edge portion of the fixing member is joined to the inner peripheral edge portion of the main body opening to form a joint portion.
The inner peripheral edge portion of the main body opening has a first engaging portion formed of at least one convex portion or a concave portion, and a step portion formed on the outer surface side of the head.
The outer peripheral edge portion of the fixing member includes a second engaging portion formed of at least one convex portion or a concave portion, and an outer surface forming convex portion formed of at least one convex portion and forming an outer surface of the head.
Have and
By forming an uneven fit between the first engaging portion and the second engaging portion, the inner peripheral edge portion and the outer peripheral edge portion are joined to each other.
A golf club head in which the outer surface forming convex portion is engaged with the step portion. The main body opening is provided in the sole portion, and the main body opening is provided in the sole portion.
The inner surface of the fixing member constitutes the inner surface of the sole portion.
The outer surface of the fixing member constitutes the outer surface of the sole portion.
The golf club head according to claim 1, wherein the outer surface forming convex portion constitutes the outer surface of the sole portion. The second engaging portion is formed along the outer peripheral edge portion.
The golf club head according to claim 1 or 2, wherein the second engaging portion is formed intermittently. The golf club head according to any one of claims 1 to 3, wherein the outer edge of the second engaging portion is formed so as to pass through at least three places that are not in a straight line in a plan view. The golf club head according to any one of claims 1 to 4, wherein the fixing member is fixed to the head body by a casting. The golf club head according to any one of claims 1 to 5, wherein the second specific density is larger than the first specific gravity. The golf club head according to any one of claims 1 to 6, wherein the first material is a titanium alloy and the second material is an alloy containing tungsten.

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