JP6600206B2 - Golf club head - Google Patents

Description

  The present invention relates to a hollow golf club head to which a weight member can be attached.

  In a hollow golf club head typified by a driver head, performance changes depending on the position of the center of gravity. As one of methods for adjusting the position of the center of gravity, a golf club head capable of attaching a weight member to a sole portion is known. Patent Documents 1 to 3 disclose mounting structures for weight members. One common attachment structure is a screw structure, and a weight member having a screw shaft is screwed into an attachment hole constituting a screw hole.

JP 2013-183972 A US Pat. No. 8,753,225 U.S. Pat. No. 8,858,362

  Since the weight concentrates on the attachment site of the weight member, the degree of vibration restraint is reduced. For this reason, there is a tendency that the hitting sound at the time of hitting the golf ball tends to be low, and a golf club head that emits a higher hitting sound is desired from a golfer who prefers a high hitting sound. If the thickness around the mounting hole is uniformly increased in order to increase the degree of restraint of the mounting portion of the weight member, the weight of the golf club head is increased.

  An object of the present invention is to increase the degree of restraint around the weight member while suppressing an increase in weight.

  According to the present invention, a hollow golf club head having a face portion, a crown portion, and a sole portion, a weight member, and a circular attachment hole formed on the sole portion to which the weight member is attached. The golf club head is characterized in that the boss portion has an elliptical cone shape.

  According to the present invention, it is possible to increase the degree of restraint around the weight member while suppressing an increase in weight.

1A is a perspective view of a golf club head according to an embodiment of the present invention, and FIG. 1B is a view of the golf club head of FIG. Sectional drawing which follows the II line | wire of FIG. 1 (B). Sectional drawing which follows the II-II line of FIG. (A) is sectional drawing which follows the line L1 of FIG. 3, (B) is sectional drawing which follows the line L2 of FIG.

  FIG. 1A is a perspective view of a golf club head 1 according to an embodiment of the present invention, and FIG. 1B is a view of the golf club head 1 viewed from the sole portion 13 side. The golf club head 1 includes a head body 10 and weight members 21 and 22.

  The head main body 10 forms a hollow body, and its peripheral wall constitutes a face part 11, a crown part 12, a sole part 13 and a side part 14. The face portion 11 has a face surface (front surface) forming a face surface (striking surface). Bulges and rolls can be formed on the face surface. The crown portion 12 forms the upper portion of the golf club head 1. The sole portion 13 forms the bottom portion of the golf club head 1. The side portion 14 forms a portion between the sole portion 13 and the crown portion 12. The head main body 10 includes a hosel portion 15 to which a shaft is attached.

  In FIG. 1A, the arrow d1 indicates the face-back direction, and the arrow d2 indicates the toe heel direction. The face-back direction is normally the flying ball direction (the target direction of the hit ball). The toe-heel direction is a direction connecting the toe side end and the heel side end of the sole portion 13.

  The golf club head 1 is a golf club head for a driver. However, the present invention can be applied to other types of hollow golf club heads such as wood-type golf club heads including fairway woods other than drivers.

  The head body 10 can be made of a metal material, and examples of such a metal material include titanium-based metals (for example, 6Al-4V-Ti titanium alloy), copper alloys such as stainless steel and beryllium copper. .

  The head body 10 can be assembled by joining a plurality of parts. In the case of this embodiment, it is comprised from the main body member and the face member. The main body member constitutes the peripheral portion of the crown portion 12, the sole portion 13, the side portion 14, and the face portion 11, and an opening is formed in a part corresponding to the face portion 11. The face member is joined to the opening of the main body member.

  The head body 10 includes attachment portions 131 and 132 formed on the sole portion 13. The weight member 21 is attached to the attachment portion 131, and the weight member 22 is attached to the attachment portion 132. The attachment portion 131 and the attachment portion 132 are formed at positions separated in both the d1 direction and the d2 direction. However, the attachment portions 131 and 132 can be formed at positions separated only in the d1 direction, or can be formed at positions separated only in the d2 direction.

  The mounting portion 131 is located at the center portion in the d2 direction, and is located at a position biased toward the face portion 11 in the d1 direction. The mounting portion 132 is located at a position biased toward the heel in the d2 direction, and is located at a position biased toward the back side in the d1 direction.

  The structures of the attachment portions 131 and 132 and the sole portion 13 will be further described with reference to FIGS. FIG. 2 is a cross-sectional view of the head main body 10 taken along the line II of FIG. 1B, and in particular, a cross-sectional view of the main body member. 3 is a cross-sectional view taken along the line II-II in FIG. 2, and is a view of the inner surface of the sole portion 13 as viewed in plan. 2 and 3, the opening 11 ′ of the main body member is a portion where the face portion 11 is formed and is closed by the face member. 4A is a cross-sectional view taken along line L1 in FIG. 3, and FIG. 4B is a cross-sectional view taken along line L2 in FIG.

  The attachment portion 131 has a circular attachment hole 21 to which the weight member 21 is attached. Further, the attachment portion 132 has a circular attachment hole 22 to which the weight member 22 is attached. In this embodiment, the attachment structure of the weight members 21 and 22 is a screw structure. FIG. 2 shows the appearance of the weight member 22, which has a screw shaft and a head portion at the end of the screw shaft. The weight member 21 has a similar structure. Accordingly, the mounting holes 21 and 22 are screw holes in the present embodiment, but can be appropriately changed according to the mounting structure employed.

  The attachment portion 131 also includes a boss portion 131b that forms an attachment hole 131a. The boss 131b has an elliptical shape. In FIG. 3, a line L1 indicates the major axis direction of the ellipse of the boss 131b, and a line L2 indicates the minor axis direction. Since the attachment hole 131a having a circular cross section is formed in the boss portion 131b having an elliptical cone shape, the thickness of the boss portion 131b around the attachment hole 131a is shown in FIGS. 4 (A) and 4 (B). Is non-uniform. 4A shows a cross section of the boss 131b in the major axis direction, and FIG. 4B shows a cross section of the boss 131b in the minor axis direction. In FIG. 4B, the broken line indicates the outline of the cross section in the major axis direction.

  As understood from FIGS. 4A and 4B, the thickness of the boss 131b around the mounting hole 131a is relatively thick in the major axis direction and relatively thin in the minor axis direction. Therefore, the boss portion 131b has a directionality of rigidity, and the rigidity is relatively high in the long axis direction, and the rigidity is relatively low in the short axis direction.

  Since weight is concentrated on the attachment portion 131 by the weight member 21, the degree of restraint of vibration is reduced. Therefore, the degree of restraint around the weight member 21 can be increased by forming the boss portion 131b so that the major axis direction faces the direction in which vibration is desired to be restrained. The increase in weight can be suppressed as compared with increasing the thickness of the boss 131b uniformly. In addition, the elliptical cone shape has better castability and productivity than the reinforcement of the periphery of the boss portion with ribs or the like.

  The vibration at the time of hitting the sole portion 13 usually proceeds in the d1 direction. As shown in FIG. 3, by directing the major axis direction L1 of the boss portion 131b in the d1 direction rather than the minor axis direction L2, it is possible to restrain vibration at the time of striking and to increase the hitting sound.

  In FIG. 3, the position P indicates the position of the antinode of the primary vibration mode of the sole portion 13, and the region R has an amplitude of the primary vibration mode of a predetermined value or more (for example, 60% or more of the amplitude of the antinode position of the temporary vibration mode, preferably Indicates a large vibration region of 80% or more. These can be specified by creating a golf club head model on a computer and analyzing the vibration.

  Since the long axis direction L1 passes through a position closer to the antinode position P than the short axis direction L2, the degree of restraint of primary vibration of the sole portion 13 can be increased by the boss portion 131b. In the example of FIG. 3, the long axis direction L1 passes through the antinode position P, but may be separated.

  In the same way, a configuration in which the long axis direction L1 passes through the large vibration region R and the short axis direction L2 does not pass through the large vibration region R may be employed. Also in this case, the restraint degree of the primary vibration of the sole portion 13 can be increased by the boss portion 131b.

  In the present embodiment, the sole portion 13 is provided with a rib 16 extending in the d2 direction. The ribs 16 are integrally formed on the upper surface of the sole portion 13, and both end portions thereof are connected to the inner surface of the side portion 14. This rib 16 also contributes to increasing the degree of restraint of the primary vibration of the sole portion 13. In the present embodiment, the extending direction of the ribs 16 intersects the long axis direction L1 of the boss portion 131b. Thereby, the restraint degree of primary vibration can be raised about both the extending direction of the rib 16 and the major axis direction L1 of the boss part 131b, and the restraint degree of the sole part 13 can be raised.

  The attachment portion 132 has the same configuration as the attachment portion 131, and includes a boss portion 132b that forms an attachment hole 132a. The boss 132b also has an elliptical shape. In FIG. 3, a line L11 indicates the major axis direction of the ellipse of the boss portion 132b, and a line L12 indicates the minor axis direction. Since the mounting hole 132a having a circular cross section is formed in the elliptical cone-shaped boss part 132b, the thickness of the boss part 132b around the mounting hole 132a is non-uniform and relatively rigid in the long axis direction L11. And the rigidity is relatively low in the minor axis direction L12.

  In the case of the example in FIG. 3, the major axis direction L11 is different from the minor axis direction L12, and there is almost no difference in the passing position with respect to the antinode position P and the large vibration region R. When viewed in the d1 direction, the long axis direction L11 is oriented in the d1 direction rather than the short axis direction L12. Therefore, the boss portion 132b can also be expected to increase the degree of restraint of primary vibration.

  A configuration in which the major axis direction L11 passes through a position closer to the antinode position P than the minor axis direction L12, or the major axis direction L11 passes through the large vibration region R and the minor axis direction L12 does not pass. It can be adopted. In this case, the effect of further increasing the degree of restraint of primary vibration can be expected.

<Other embodiments>
In the above embodiment, two sets of weight members and their attachment portions are provided, but one set may be used, or three or more sets may be used. In addition, when providing a plurality of sets of weight members and their attachment portions, the shape of all boss portions may be elliptical cone shapes, only the shape of some boss portions is elliptical cone shape, and the remaining boss portions are, for example, A conical shape may also be used. The weight member may be fixed to the attachment portion in a replaceable manner, and the golfer may be able to select the type of weight member to be fixed to the attachment portion from a plurality of types of weight members.

  When there are a plurality of elliptical cone-shaped boss parts, the major axis direction of all the boss parts may pass a position closer to the antinode position P than the minor axis direction, or the major axis direction of some boss parts may be You may pass the position closer to the antinode position P than the short axis direction. Similarly, when there are a plurality of bosses having an elliptical cone shape, the major axis direction of all the boss parts passes through the large vibration region R, and the minor axis direction may not pass, or the length of some boss parts The axial direction may pass through the large vibration region R, and the minor axis direction may not pass.

  When the restraint degree of the sole portion increases, the hitting sound may be too high. Therefore, as in the example of FIG. 3, with respect to some of the attachment portions (132), the major axis direction (L11) is not directed in a direction effective for improving the degree of restraint, and the hitting sound is increased by reducing the degree of restraint. You may make it not become too much, or you may make it low. In the same way, for example, in the example of FIG. 3, the configuration in which the short axis direction L2 of the boss portion 131b passes a position closer to the antinode position P than the long axis direction L1, or the short axis direction L2 is greatly vibrated. A configuration in which the long axis direction L1 does not pass through the large vibration region R through the region R may be used. As a result, the degree of restraint in the d1 direction at the attachment portion 131 is weakened, and the hitting sound may not be excessively increased or may be decreased.

10 Golf club head 13 Sole part 21, 22
131a, 132a Mounting holes 131b, 132b Boss

Claims (8)

A hollow golf club head having a face portion, a crown portion, and a sole portion,
A weight member;
A boss part formed on the sole part and forming a circular attachment hole to which the weight member is attached,
The boss has an elliptical cone shape,
A golf club head characterized by that. The golf club head according to claim 1,
The long axis direction of the boss part passes through a position closer to the position of the antinode of the primary vibration mode of the sole part than the short axis direction.
A golf club head characterized by that. The golf club head according to claim 2 ,
The sole portion includes a large vibration region where the amplitude of the primary vibration mode is a predetermined value or more,
The long axis direction passes through the large vibration region, and the short axis direction does not pass through the large vibration region.
A golf club head characterized by that. The golf club head according to claim 1,
The boss is located at the center of the toe-heel direction,
The major axis direction of the boss part is oriented in the face-back direction rather than the minor axis direction,
A golf club head characterized by that. The golf club head according to claim 1,
A rib formed on the sole portion and extending in a toe-heel direction;
The extending direction of the ribs intersects the major axis direction of the boss part,
A golf club head characterized by that. A hollow golf club head having a face portion, a crown portion, and a sole portion,
A plurality of weight members;
A plurality of boss portions formed in the sole portion and forming circular mounting holes to which the plurality of weight members are attached;
At least one boss portion of the plurality of boss portions has an elliptical cone shape,
A golf club head characterized by that. The golf club head according to claim 6,
The plurality of boss portions of the plurality of boss portions have an elliptical cone shape, and the major axis directions intersect with each other.
A golf club head characterized by that. The golf club head according to claim 6,
Among the plurality of boss portions, the plurality of boss portions have an elliptical cone shape, and the major axis direction thereof passes through a position closer to the antinode position of the primary vibration mode of the sole portion than the minor axis direction. ing,
A golf club head characterized by that.

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