JP6273670B2 - Iron type golf club head - Google Patents

Description

  The present invention relates to an iron type golf club head, and more particularly to an iron type golf club head having a head body having a frame-like face portion and a face plate fixed to the head body.

  As is well known, an iron type golf club head has a face part having a flat face surface and a hosel part connected to the heel side of the face part, and a shaft insertion hole is provided in the hosel part. Yes. A shaft is inserted into the shaft insertion hole and fixed by an adhesive.

  As iron-type golf club heads, Patent Documents 1 and 2 include a head body having a frame shape on the face side, and a face plate fixed to the head body, and the back surface of the edge of the face plate is An iron head fixed to the front surface of the peripheral portion of the head body is described.

  Patent Document 3 describes an iron-type golf club head in which the center portion (the center portion in the toe / heel direction) on the back of the face portion is thicker toward the sole side. The face plate is not fixed to the main body.

JP 2010-5281 JP 2006-325748 A JP2007-289639

  As a result of various studies by the present inventor, in an iron type golf club head having a head body having a face-shaped frame and a face plate fixed to the head body, a ball was hit. It was recognized that a large stress was generated in the central portion in the longitudinal direction of the upper edge portion of the head body at the time of impact, and this caused an increase in vibration at the time of impact and a decrease in feel at impact.

  The present invention suppresses vibration at the time of impact in an iron-type golf club head having a head body having a face-shaped frame and a face plate fixed to the head body, thereby improving the hit feeling. An object of the present invention is to provide a golf club head that can be used.

  The golf club head of the present invention has a head body having a frame-like face portion, and a face plate fixed to the head body, and an upper edge portion, a lower edge portion, and a toe side edge of the face plate. In an iron type golf club head whose back surface is fixed to the front surface of the upper edge portion, lower edge portion and toe side edge portion of the head body, the vertical width of the central portion in the longitudinal direction of the upper edge portion of the head body Is larger than the vertical width of the upper edge on the toe side and heel side.

  The maximum vertical width of the central portion in the longitudinal direction of the upper edge of the head body is preferably 1.5 to 4 times the minimum vertical width on the heel side of the upper edge.

  The minimum vertical width on the toe side of the upper edge of the head body may be equal to or smaller than the minimum vertical width on the heel side.

  It is preferable that a concave portion is provided on the back side of the face plate on the toe side and the heel side. In this case, it is preferable that the thickness of the upper side portion is larger than the thickness of the lower side portion in the portion between the recesses.

  It is preferable that no score line exists in front of the upper surface of the lower edge of the head body.

  In the golf club head of the present invention, the vertical width of the central portion in the longitudinal direction (toe / heel direction) of the upper edge portion of the head body having a frame-like face portion is larger than the vertical width on the toe side and heel side. Therefore, the stress generated in the central portion of the upper edge portion at the time of impact is reduced, vibration at the time of impact is suppressed, and the hit feeling is improved. In particular, such an effect becomes conspicuous by setting the maximum vertical width of the central portion in the longitudinal direction of the upper edge of the head body to 1.5 to 4 times the minimum vertical width on the heel side.

  In the present invention, since the vertical width is increased only in the central portion of the upper edge portion, the weight increase is small.

  Since the toe side of the head body is smaller than the heel side, the stress generated at the time of impact may be smaller than the minimum vertical width on the heel side of the upper edge of the head body. In this way, the weight of the golf club head is reduced by that amount.

  Since the stress at impact is smaller on the toe side and heel side of the face plate than on the center part, a recess may be provided on the toe side and heel side of the back of the face plate to reduce the weight of the golf club head.

  In this case, the portion between the recesses is a thick portion having a relatively large thickness. By making the thickness of the upper side portion of the thick portion larger than the thickness of the lower side portion, the vicinity of the central portion of the upper edge portion of the head body can be reinforced.

  A score line is generally provided on the front surface of the face plate. By not providing a score line in front of the upper surface of the lower edge of the head body, it is possible to reduce the shear stress generated in the lower portion of the face plate at the time of impact.

It is a rear view of the iron type golf club head concerning an embodiment. 1 is a perspective view of an iron type golf club head according to an embodiment. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. 1 is an exploded perspective view of a golf club head. It is sectional drawing which follows the VI-VI line of FIG. It is explanatory drawing of the stress distribution in embodiment. It is explanatory drawing of the stress distribution in a comparative example. It is a rear view of the iron type golf club head concerning another embodiment. It is a rear view of the iron type golf club head which concerns on different embodiment. It is a stress distribution map of a golf club head.

  Hereinafter, embodiments will be described with reference to FIGS.

  The iron type golf club head 1 has a head body 10 having a frame shape with a face portion having an opening 11 and a face plate 20 fixed to the head body 10 by laser welding or the like. The outer peripheral edges of the upper edge part, the toe side edge part, and the lower edge part of the face plate 20 coincide with the outer peripheral edge of the head body.

  A hosel portion 12 is provided on the heel side of the head body 10.

  As shown in FIG. 5, the upper edge portion 13, the lower edge portion (sole portion) 14, and the toe side edge portion 15 of the face portion of the head body 10 are thicker than the front surface portion 16 on the heel side of the head body 10. Retreat by minutes.

  In this embodiment, the head body 10 is made of an iron-based material such as stainless steel or soft iron.

As shown in FIGS. 1 and 5, the central portion of the upper edge portion 13 in the longitudinal direction (toe / heel direction) is a convex portion 17 projecting downward, and the vertical width W _{1 of the} central portion is the upper edge portion 13. which is larger than the minimum vertical width W ₃ of the minimum vertical width W ₂ and the toe side of the heel side.

In this embodiment, the convex portion 17 has a constant vertical width in the longitudinal direction. Vertical width _{W 1} of the central portion is preferably 1.5 to 4 times, especially 2.0 to 3.5 times the minimum vertical width _{W 2} of the heel side. Toe side of the upper edge 13 has a substantially constant vertical width W _3. Heel side of the upper edge 13 has a substantially constant vertical width W _2. Therefore, in this embodiment, the toe side minimum vertical width is W ₃ and the heel side minimum vertical width is W ₂ . This toe-side vertical width W ₃ being are the same and the heel-side vertical width W _2, may be slightly smaller than W _2.

W ₁ is preferably 3.5 to 7.2 mm, particularly preferably about 4.0 to 6.3 mm, and W ₁ -W ₂ is preferably 1.8 to 3 mm, particularly preferably about 2.0 to 3.0 mm. The length L of the protrusion 17 in the longitudinal direction is preferably 25 to 40%, particularly 30 to 31% of the maximum length of the face plate 20 in the toe-heel direction.

  As shown in FIG. 4, the lower edge portion (sole portion) 14 of the head main body 10 extends rearward, and the rear edge rises slightly upward, but may rise higher than illustrated. Further, a weight made of a high specific gravity material such as tungsten may be embedded in the sole portion.

  As shown in FIG. 5, a first recess 21 is provided on the toe side of the back surface of the face plate 20, and a second recess 22 is provided on the heel side. Between the recesses 21 and 22 is a thick portion 23 having a relatively large thickness compared to the toe side and the heel side.

  The face plate 20 has the largest thickness on the upper side except for the recesses 21 and 22, and the thickness gradually decreases toward the lower side.

  In the thick portion 23, the thickness on the upper side is preferably about 2.0 to 3.2 mm, particularly about 2.1 to 2.8 mm, and the thickness on the lower side is 0.2 to 0.2 mm than the upper side. It is preferably 5 mm, particularly 0.3 to 0.4 mm smaller.

  The average thickness of portions other than the concave portions 21 and 22 of the face plate 20 is preferably 3.2 to 1.8 mm, particularly 1.9 to 2.8 mm. The average thickness of the face plate in the recesses 21 and 22 is preferably 0.1 to 0.4 mm, more preferably 0.2 to 0.3 mm smaller than that.

As shown in FIG. 5, the width of the thick portion 23 in the toe-heel direction is the smallest at the upper part and gradually increases toward the lower part. The width B _{1 in} the upper toe / heel direction of the thick portion 23 is preferably equal to the convex portion 17, and the width B _{2 in} the lower toe / heel direction is equal to the convex portion 17 or 1 of the width of the convex portion 17. The range is preferably up to 5 times.

  Preferred constituent materials for the face plate 20 include, but are not limited to, stainless steel, soft iron, titanium alloy, copper alloy, and the like.

  A plurality of score lines 25 are provided in parallel on the front surface of the face plate 20. A score line 25 is not provided in front of the upper surface 14a of the lower edge portion (sole portion) 14 of the head body 10. That is, the intersection point where the perpendicular line dropped from the front edge of the upper surface of the lower edge portion 14 to the face surface and the face surface intersect is separated from the score line 25. The distance from the intersection to the nearest score line is preferably 1 m or more, particularly 1 to 5 mm.

  By not matching the upper surface 14a of the lower edge portion 14 and the score line 25 in this way, the shear stress generated in the vicinity of the upper surface 14a of the lower edge portion 14 of the face plate 20 at the time of impact is reduced.

In the golf club head 1 configured as described above, the convex portion 17 is provided at the center in the longitudinal direction (toe / heel direction) of the upper edge portion 13 of the head body 10 having a frame-like face portion. since the vertical width W ₁ is larger than the vertical width W ₃ of the upper and lower widths W ₂ and toe side of the heel side, stress is reduced resulting in a central portion of the upper edge 13 at impact, vibration at impact It is suppressed and the hit feeling is improved. The W ₁ by a 1.5 to 4.0 times the _{W 2,} this effect becomes remarkable.

In the present invention, since the large longitudinal center only vertical width W ₁ of the upper edge 13, less weight gain.

  Further, since the upper side of the thick portion 23 of the face plate 20 has a large thickness, the central portion in the longitudinal direction of the upper edge portion 13 is also reinforced by the upper side portion of the face plate 20. The hit feeling is good.

  In this embodiment, since the concave portions 21 and 22 are provided on the toe side and the heel side of the face plate 20, the weight of the golf club head is reduced accordingly.

In the present invention, stress generated at the time of impact, since the direction of the toe side of the head main body is smaller than the heel side, as described above, the vertical width of the vertical width W ₃ of the heel side of the toe side of the upper edge portion of the head body it may be smaller than W _2. In this way, the weight of the golf club head is reduced by that amount.

  In the above embodiment, the convex portion 17 has a uniform vertical width (projecting height downward) in the longitudinal direction. However, the heads of the golf club heads 1A and 1B according to the embodiments of FIGS. Like the convex portions 17A and 17B of the main bodies 10A and 10B, the vertical width may not be constant in the longitudinal direction. In the convex portion 17A, the vertical width is maximum on the heel side, and the vertical width is gradually reduced toward the toe side. In the convex portion 17B, the vertical width is maximum in the middle of the upper edge portion 13 in the longitudinal direction, and the height gradually decreases from there toward the toe side and the heel side.

  Other configurations of the head main bodies 10A and 10B in FIGS. 9 and 10 are the same as those of the head main body 10, and the same reference numerals denote the same parts.

  The present invention is suitable for application to an iron head having a loft angle of 20 ° or less, for example, 27 ° to 45 °, in which a large stress is generated in the upper edge portion 13 of the face portion at the time of impact.

<Example 1>
A head main body 10 for a 5 iron (loft angle 27 °) was configured as shown in FIGS. W ₁ = 6.7 mm, W ₂ = 2.2 mm, and W ₃ = 2.2 mm.

  As the face plate 20, a rolled plate material of SUS415 was used. Score lines (grooves) were formed with an engraving machine.

The face-type plate 20 and the head main body 10 are laser-welded to form an iron type golf club head 1. The thickness of the upper edge of the face plate 20 is 2.7 mm, the thickness of the lower edge is 2.4 mm, the thickness in the recesses 21 and 22 is 2.2 mm, the width B ₁ of the uppermost portion of the thick portion 23 is 30 mm, width _{B 2} bottom of the thick portion 23 was set to 35 mm.

  With respect to the golf club having a carbon shaft attached to the golf club head 10, the stress distribution generated in the upper edge portion 13 when the ball was hit at a head speed of 38 m / sec was calculated by computer simulation. The results are shown in FIGS. 7 and 11 (b).

<Comparative Example 1>
As shown in FIG. 8, the same golf club head 1 as in Example 1 except that a head body 10 'in which the convex portion 17 is omitted and a face plate 20' having no concave portions 21, 22 is used. The same simulation calculation as in Example 1 was performed for '. The results are shown in FIGS. 8 and 11 (a). In FIGS. 11A and 11B, the stress increases in the order of blue → green → yellow → red.

  From the comparison between FIGS. 7 and 8 and FIGS. 11A and 11B, it was confirmed that the stress generated in the central portion of the upper edge 13 of the head main body at the time of impact is reduced according to the present invention.

1, 1A, 1B, 1 'Golf club head 10, 10A, 10B, 10' Head main body 11 Opening 13 Upper edge 14 Lower edge 14a Lower edge upper surface 15 Toe side edge 16 Heel side front surface 20, 20 'Face plate 21, 22 Recess 23 Thick part 25 Score line

Claims (11)

It has a face part and a hosel part, and the face part has a frame shape with an opening. The opening is fixed to the head body and the head body that opens to the front side and the back side of the head body. A rear face of the upper edge, the lower edge and the toe side edge of the face plate, a front surface of the upper edge of the upper side of the opening of the head body, and a lower side of the lower side of the opening. In an iron type golf club head fixed to a front surface of an edge portion and a front surface of a toe side edge portion on the toe side of the opening,
A convex portion projecting downward is provided at the longitudinal central portion of the upper edge portion of the upper side of the opening of the head main body, so that the vertical width of the central portion of the upper edge portion is the height of the upper edge portion. A golf club head characterized by being larger than a vertical width on a toe side and a heel side.   2. The maximum vertical width of the central portion in the longitudinal direction of the upper edge portion of the head main body according to claim 1, wherein the maximum vertical width is 1.5 to 4 times the minimum vertical width on the heel side of the upper edge portion. Golf club head.   3. The golf club head according to claim 1, wherein the minimum vertical width on the toe side of the upper edge of the head body is smaller than the minimum vertical width on the heel side. 4. The golf club head according to claim 1, wherein a lower edge portion of the head body extends rearward and a rear edge rises upward. 5. 5. The upper edge portion, the lower edge portion, and the toe side edge portion of the face portion of the head body recede by the thickness of the face plate from the front surface portion on the heel side of the head body. A golf club head characterized by that. In any one of claims 1 to 5, the golf club head, wherein a recess on the rear of the toe side and the heel side of the face plate is provided. 7. The golf club head according to claim 6 , wherein the thickness of the upper side portion is greater than the thickness of the lower side portion in a portion between the concave portions of the face plate. The golf club head according to claim 7 , wherein a score line is provided on a front surface of the face plate, and the score line is absent in front of an upper surface of a lower edge portion of the head body. According to claim 6, between the toe side of the concave portion and the heel side of the concave portion of the back surface of said face plate, characterized in that it has a large thickness portion of the thickness than the recess of the toe and heel sides Golf club head. The golf club head according to claim 9 , wherein the convex portion is provided above the thick portion. 11. The golf club head according to claim 6, wherein the toe side and the heel side recesses on the back side of the face plate are exposed on the back side.

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