JP5763701B2 - Iron golf club head and iron golf club - Google Patents

Description

  The present invention relates to an iron golf club head and an iron golf club, and more particularly to an iron golf club head and an iron golf club having a groove in a cavity.

2. Description of the Related Art Conventionally, a cavity back type iron golf club head having a cavity portion on the back side of a face portion has been widely known.

  Japanese Patent No. 3658393 discloses an iron golf club having a groove portion in a cavidi portion.

Japanese Patent No. 3658393

  However, since the iron golf club described in Japanese Patent No. 3658393 has a large variation in the coefficient of restitution within the face surface, when the ball is hit at the center part of the face part and in a region slightly shifted from the center part of the face part. The hit feeling and the flight distance are greatly different from when the ball is hit. In particular, there is a large difference in the coefficient of restitution between the center portion of the face portion and the region on the heel portion side close to the shaft, and there is a problem that it is difficult for a user who seeks the directional stability of the hit ball.

  The present invention has been made to solve the above-described problems. SUMMARY OF THE INVENTION The main object of the present invention is to provide an iron golf club head and an iron golf club in which variation in the coefficient of restitution within the hitting surface is reduced.

The iron golf club head of the present invention includes a face portion having a ball striking surface and a face back surface located on the back side of the ball striking surface, and a cavity portion provided on the rear side of the face back portion. The cavity part includes a groove part extending in a direction from a heel part located at an end part on the shaft side with respect to the ball striking face to a toe part located at an end part opposite to the heel part with respect to the ball striking face, In the direction extending from the heel portion to the toe portion, the thickness from the hitting surface at the central portion located between the heel portion and the toe portion to the side wall on the hitting ball side of the groove portion is the heel portion and the Thicker than the thickness at the toe. The thickness at the toe portion is thicker than the thickness at the heel portion.

  ADVANTAGE OF THE INVENTION According to this invention, the iron golf club head and iron golf club which reduced the dispersion | variation in the restitution coefficient in a hitting surface can be obtained.

It is a figure for demonstrating the iron golf club head which concerns on Embodiment 1. FIG. It is sectional drawing in line segment II-II in FIG. It is sectional drawing in line segment III-III in FIG. FIG. 6 is a diagram for explaining an iron golf club head according to a second embodiment. FIG. 6 is a cross-sectional view for explaining an iron golf club head according to a third embodiment. It is a figure for demonstrating the thickness distribution of the face part in the direction extended from a heel part to a toe part about each sample of an Example. It is a graph which shows an analysis result about each sample of an example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a perspective view of the iron golf club head according to the present embodiment as viewed from the top edge side. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  With reference to FIGS. 1 to 3, iron golf club head 10 according to the present embodiment includes a face portion 1 and a cavity portion 2.

  The face portion 1 includes a face surface (ball striking surface) 3 and a face back surface 4 located on the back side of the face surface 3. The face surface 3 has a region of high repulsion (for example, a restitution coefficient of 0.75 or more) that is expected to hit a ball at the central portion 10c, and a heel portion 10h located at an end portion on the shaft 11 side. To the toe portion 10t located at the end opposite to the heel portion 10h with respect to the face surface 3. Here, the central portion 10c is located at the central portion of the score line width extending on the face surface 3 in the direction from the heel portion 10h to the toe portion 10t. Further, the face surface 3 extends from the top edge portion 5 positioned at the upper end in the vertical direction to the sole portion 6 positioned at the end in contact with the grounding surface when the iron golf club is held. That is, the face surface 3 does not have a bent surface and is configured by one plane. The face back surface 4 is provided in parallel with the face surface 3 from the heel portion 10h to the toe portion 10t. That is, in the region where the face back surface 4 is formed, the thickness of the face portion 1 is the thickness from the face surface 3 to the face back surface 4 and is provided uniformly.

  The cavity portion 2 is located on the rear side from the face back surface 4. The cavity portion 2 is formed so as to continue to the sole portion 6 side of the face portion 1. In the cavity portion 2, a groove portion 8 extending in a direction from the heel portion 10h toward the toe portion 10t is formed. The groove portion 8 has an opening on the top edge portion 5 side, and a bottom surface is provided on the sole portion 6 side. The front (face surface 3 side) side wall of the groove portion 8 is bent in a so-called dogleg shape in a direction extending from the heel portion 10h to the toe portion 10t. Further, the distance (thickness) from the front side wall of the groove portion 8 to the face surface 3 is the thickest at the central portion 10c.

  The upper end portion of the groove portion 8 is positioned closer to the sole portion 6 than the central portion in the direction from the sole portion 6 of the face portion 1 to the top edge portion 5. A protruding wall 9 is formed on the rear side of the groove 8 so as to define the bottom surface and the rear side wall of the groove 8. The protruding wall 9 deepens and lowers the center of gravity of the iron golf club head 10.

  At this time, in the region where the groove 8 is formed, the thickness of the face 1 is the thickness from the face surface 3 to the front side wall of the groove 8 and has a distribution. The thickness from the face surface 3 to the front side wall of the groove portion 8 in the heel portion 10h is formed to be equal to the thickness from the face surface 3 to the front side wall of the groove portion 8 in the toe portion 10t. The thickness from the face surface 3 to the front side wall of the groove portion 8 gradually increases from the heel portion 10h to the central portion 10c and from the toe portion 10t to the central portion 10c. The thickness from the face surface 3 to the front side wall of the groove portion 8 in the central portion 10c is thicker than the thickness from the face surface 3 to the front side wall of the groove portion 8 in the heel portion 10h and the toe portion 10t.

  Thereby, by increasing the thickness Hc from the face surface 3 to the front side wall of the groove 8 in the central portion 10c, the restitution coefficient of the central portion 10c is lowered, and the difference in the restitution coefficient from the heel portion 10h and the toe portion 10t. Can be reduced. Further, the iron golf club head 10 has high durability because the face portion 1 is formed thick at the central portion 10c.

  Further, in the groove portion 8, the thickness from the face surface 3 at the bottom portion of the groove portion 8 to the front side wall of the groove portion 8 is provided thinner than the thickness at the upper end portion of the groove portion 8. As a result, the thickness from the face surface 3 to the front side wall of the groove 8 is reduced in the face portion 1 located on the sole portion 6 side, which is less bent than the top edge portion 5 because the protruding wall portion 9 is connected. It can be made thinner than the thickness at the upper end. As a result, the thickness of the central portion 10c on the side where the upper end portion of the groove portion 8 is located (the central side in the direction extending from the top edge portion 5 to the sole portion 6) is thick, but the central portion 10c is closer to the sole portion 6 side. A reduction in the coefficient of restitution of the face portion 1 can be suppressed. That is, by suppressing the coefficient of restitution of the central portion 10c in the direction extending from the heel portion 10h to the toe portion 10t, the variation of the coefficient of restitution can be effectively reduced while the coefficient of restitution on the sole portion 6 side of the central portion 10c is further increased. By suppressing the decrease, variation in the coefficient of restitution can be effectively reduced even in the direction extending from the top edge portion 5 to the sole portion 6.

  The iron golf club head 10 is formed by forging the shape as described above. For example, the carbon steel can be formed by forging and then machining. Thereby, a shot feeling can be improved compared with the case where it manufactures by casting. The groove 8 may be formed, for example, by cutting using a T slot cutter after forging.

  As described above, the iron golf club head 10 according to the present embodiment has the face surface at the central portion 10c located between the heel portion 10h and the toe portion 10t in the direction extending from the heel portion 10h to the toe portion 10t. To the front side wall of the groove portion 8 is thicker than the thicknesses at the heel portion 10h and the toe portion 10t. Further, the thickness from the face surface 3 at the bottom of the groove 8 to the front side wall of the groove 8 is smaller than the thickness at the upper end of the groove 8. Therefore, the variation in the coefficient of restitution is effectively reduced in the direction extending from the heel portion 10h to the toe portion 10t, and the variation in the coefficient of restitution is also effectively reduced in the direction extending from the top edge portion 5 to the sole portion 6. Can do.

  Since an iron golf club including the above-described iron golf club head 10 has a sweet spot wider than that of a conventional iron golf club, it is easy to handle for a user who needs directional stability of a hit ball.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. The iron golf club head and the iron golf club according to the present embodiment basically have the same configuration as the iron golf club head and the iron golf club according to the first embodiment, but the upper end portion of the front side wall of the groove portion 8. 3 in that it includes face back surfaces 4b and 4c extending from the top to the top edge 5 side.

  Referring to FIG. 4, face back surface 4 according to the present exemplary embodiment includes a face back surface 4a formed in parallel with face surface 3, and two faces having different inclination angles with respect to face back surface 4a. Back surfaces 4b and 4c are included. That is, the face back surface 4b and the face back surface 4c are provided so as to be inclined with respect to each other while sharing one side in the central portion 10c, and the one side when viewed from the face back surface 4a. It forms a ridgeline.

  The front side wall of the groove 8 forms one side of each of the face back surfaces 4b and 4c at the upper end defining the opening. In other words, the upper end portion of the front side wall of the groove portion 8 extending from the heel portion 10h to the central portion 10c is on the face back surface 4b, and the upper end portion of the front side wall of the groove portion 8 extending from the central portion 10c to the toe portion 10t is on the face back surface 4c. , Each has one side.

  Therefore, in the direction extending from the top edge portion 5 side to the sole portion 6 side, the thickness between the face surface 3 and the face back surface 4 is the thickest at the upper end portion of the front side wall of the groove portion 8, It is provided so that it becomes thinner as it goes to the edge part 5 side and the bottom part side of the groove part 8. That is, in the region where the face surface 3 and the face back surfaces 4b and 4c face each other, the center portion 10c where the face back surface 4b and the face back surface 4c share a ridge line with the face back surface 4a is the thickest, and the heel portion The 10h side and the toe portion 10t side are formed thinner than the central portion 10c.

  In this way, even in a region where the groove portion 8 is not formed (a region where the face surface 3 and the face back surfaces 4b and 4c face each other), the face portion in the central portion 10c compared to the heel portion 10h and the toe portion 10t. The thickness of 1 can be increased. In other words, the thickness from the face surface 3 to the face back surface 4 at the center portion 10c, the thickness from the face surface 3 to the face back surface 4b at the heel portion 10h, and the face surface 3 to the face back surface 4c at the toe portion 10t. It can be made thicker than For this reason, it is possible to effectively reduce variations in the coefficient of restitution in the direction extending from the heel portion 10h to the toe portion 10t and the direction extending from the top edge portion 5 to the sole portion 6 over a wider range than in the first embodiment. .

(Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view of the upper end portion of the groove portion 8 of the iron golf club head according to the present embodiment when viewed from the top edge portion 5 side, and corresponds to a cross-sectional view taken along line V-V in FIG. To do. The iron golf club head and the iron golf club according to the present embodiment basically have the same configuration as that of the first embodiment, but the thickness Ht from the face surface 3 to the front side wall of the groove portion 8 in the toe portion 10t. Is different in that it is thicker than the thickness Hh from the face surface 3 to the front side wall of the groove 8 in the heel portion 10h.

  That is, in the present embodiment, regarding the thickness from the face surface 3 to the upper end portion of the front side wall of the groove portion 8, the thickness Hc from the face surface 3 to the front side wall of the groove portion 8 at the center portion 10c and the face at the toe portion 10t. The relationship between the thickness Ht from the surface 3 to the front side wall of the groove 8 and the thickness Hh from the face surface 3 to the front side wall of the groove 8 in the heel portion 10h is Hc> Ht> Hh.

  As a result, the face portion 1 is formed to be thinnest in the heel portion 10h that is stiff and difficult to bend because it is close to the shaft 11, so that the variation in the coefficient of restitution is more effective in the direction extending from the heel portion 10h to the toe portion 10t. Can be reduced.

Examples of the present invention will be described below.
In this example, in the iron golf club head, eigenvalue analysis was performed on three types having different thickness distributions of the face portion in the heel portion, the central portion, and the toe portion, and the coefficient of restitution was evaluated.

(sample)
Referring to FIG. 6, the iron golf club head of Example 1 has a structure in which the thickness of the face portion at the heel portion and the toe portion is equal, and the thickness of the face portion at the center portion is larger than these. Specifically, the thickness of the central portion was 6.6 mm, the thickness of the toe portion was 3.0 mm, and the thickness of the heel portion was 3.0 mm. The iron golf club head of Example 2 had a structure in which the thickness of the face portion was the thickest at the central portion, and the thickness was reduced in the order of the toe portion and the heel portion. Specifically, the thickness of the central part was 6.9 mm, the thickness of the toe part was 4.6 mm, and the thickness of the heel part was 2.4 mm. The iron golf club head of Comparative Example 1 has a structure in which the heel portion, the center portion, and the toe portion of the face portion are uniformly provided. Specifically, the thickness of the central part was 3.2 mm, the thickness of the toe part was 3.2 mm, and the thickness of the heel part was 3.2 mm.

(Evaluation method)
The model of the said Example 1, Example 2, and the comparative example 1 was created by CAD, and the coefficient of restitution was simulated by the finite element method using Creo Simulate by PTC.

(result)
FIG. 7 is a graph showing the analysis results of Example 1, Example 2, and Comparative Example 1. The horizontal axis in FIG. 7 is the toe part (10 mm toe side from the center), the center (on the center part and 15 mm above the face surface from the leading edge (the end part located on the sole part side of the face surface)), and the heel part ( Each part on the 10 mm heel side from the center is shown. The vertical axis in FIG. 7 indicates the ratio of the restitution coefficient of each portion when the restitution coefficient at the center is 1 in Example 1, Example 2, and Comparative Example 1. In the structure of Comparative Example 1, the coefficient of restitution of the toe part and the heel part is greatly reduced with respect to the center part, but in the structure of Example 1 and Example 2, the coefficient of restitution of the toe part and heel part with respect to the center part is lowered. It was confirmed that can be suppressed. In particular, the effect is high in the heel portion, and the coefficient of restitution of the heel portion has decreased to about 75% of the central portion in Comparative Example 1, but is about 80% in Example 1 and about 85% in Example 2. It was confirmed that variation in the coefficient of restitution can be reduced.

  Here, although there is a part which overlaps with embodiment mentioned above, the characteristic structure of this invention is enumerated.

  A golf club head 10 according to the present invention includes a face portion having a ball striking surface (face surface) 3 and a face back surface 4 positioned on the back side of the ball striking surface (face surface) 3, and a rear side of the face back surface 4. And a cavity portion 2 provided on the surface. The cavity portion 2 is positioned from the heel portion 10h positioned at the end on the shaft 11 side with respect to the ball striking surface (face surface) 3 to the end portion opposite to the heel portion 10h with respect to the ball striking surface (face surface) 3. Including a groove portion 8 extending in a direction toward the toe portion 10t, and in a direction extending from the heel portion 10h to the toe portion 10t, the groove portion 8 extends from the face surface 3 at the central portion 10c located between the heel portion 10h and the toe portion 10t. The thickness to the side wall on the face surface 3 side of the heel portion 10h and the toe portion 10t is thicker than the thickness from the face surface 3 on the heel portion 10h and the toe portion 10t to the side wall on the face surface 3 side of the groove portion 8.

  Thereby, by increasing the thickness from the face surface 3 to the front side wall of the groove portion 8 in the central portion 10c, the restitution coefficient is lowered, and the difference in the restitution coefficient from the heel portion 10h and the toe portion 10t is reduced. Can do. The iron golf club head 10 has high durability because the thickness from the face surface 3 to the front side wall of the groove 8 is thick at the central portion 10c.

  The thickness from the face surface 3 to the front side wall of the groove portion 8 in the toe portion 10t may be larger than the thickness from the face surface 3 to the front side wall of the groove portion 8 in the heel portion 10h.

  Thereby, since the face part 1 is formed thinnest in the heel part 10h, the variation in the coefficient of restitution can be more effectively reduced in the direction extending from the heel part 10h to the toe part 10t.

The iron golf club head 10 may be formed by forging.
Thereby, the hit feeling of the iron golf club head 10 can be improved.

  The central portion 10c may have a thickness Hc of 3.5 mm or greater and 7.5 mm or less. Moreover, 3.0 mm or more and 5.0 mm or less may be sufficient as thickness Ht in the toe part 10t. Further, the thickness Hh of the heel portion 10h may be 2.0 mm or greater and 4.0 mm or less.

  By doing so, the iron golf club head 10 can more effectively reduce the variation in the coefficient of restitution in the direction extending from the heel portion 10h to the toe portion 10t, and has high durability. .

The thickness at the bottom of the groove 8 may be thinner than the thickness at the upper end of the groove 8.
Thereby, the coefficient of restitution of the face part 1 around the sole part 6 can be increased. That is, the coefficient of restitution on the sole portion 6 side can be increased also in the central portion 10c. As a result, in the direction extending from the heel portion 10h to the toe portion 10t, the thickness of the central portion 10c is maximized to suppress the coefficient of restitution, thereby effectively reducing the variation in the coefficient of restitution, while repelling the center portion 10c as a whole. It can suppress that a coefficient falls.

  An iron golf club according to the present invention includes the iron golf club head 10 described above.

  Thereby, the iron golf club according to the present invention has a sweet spot wider than that of the conventional iron golf club.

  Although the embodiments and examples of the present invention have been described above, various modifications can be made to the above-described embodiments and examples. Further, the scope of the present invention is not limited to the above-described embodiments and examples. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Face part, 2 Cavity part, 3 Face surface, 4, 4a, 4b, 4c Face back surface, 5 Top edge part, 6 Sole part, 8 Groove part, 9 Projection wall part, 10 Iron golf club head, 10c Center part, 10h heel part, 10t toe part, 11 shaft.

Claims (5)

A face portion having a ball striking surface and a face back surface located on the back side of the ball striking surface;
A cavity portion provided on the rear side of the face back surface,
The cavity portion includes a groove portion extending in a direction from a heel portion located at an end portion on a shaft side with respect to the ball striking surface to a toe portion located at an end portion opposite to the heel portion with respect to the ball striking surface. Including
In the direction extending from the heel portion to the toe portion, the thickness from the ball striking surface at the central portion located between the heel portion and the toe portion to the side wall on the ball striking surface side of the groove portion is the heel portion. and rather thick than the thickness at the toe portion,
The thickness of the toe portion is an iron golf club head that is thicker than the thickness of the heel portion . The iron golf club head according to claim 1 , wherein the iron golf club head is formed by forging. The thickness at the central portion is 3.5 mm to 7.5 mm, the thickness at the toe portion is 3.0 mm to 5.0 mm, and the thickness at the heel portion is 2.0 mm to 4.0 mm. The iron golf club head according to claim 1 or 2 , wherein: The iron golf club head according to any one of claims 1 to 3 , wherein the thickness at the bottom of the groove is thinner than the thickness at the upper end of the groove. An iron golf club comprising the iron golf club head according to any one of claims 1 to 4 .

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