JP2005111172A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve repulsion of a golf ball at a hitting, in a simple structure of the club head, by changing hardness smoothly, so as to disperse stress effectively. <P>SOLUTION: Two or more thin wall sections 17 with curve parts (R) on the corner part of surrounding walls are provided corresponding to face section 13 at predetermined space in an inner wall section of the crown part 11 of the head 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a golf club head including a head body formed in a hollow structure, for example.

  In general, this type of golf club head is composed of a plurality of members made of a metal material such as stainless steel, aluminum alloy, titanium, titanium alloy or the like in a desired shape by a technique such as casting, forging, or pressing, and fiber reinforced resin (FRP). The members formed in (1) are combined into a hollow structure by welding or bonding.

  By the way, such a golf club head receives a large impact at the time of hitting a ball at the face portion of the head main body, so that there is one request for promoting the thinning after increasing the strength of the head main body. is there. As a golf club head that can be thinned while increasing the strength of the head body, a structure in which a plurality of recesses are formed at predetermined intervals in the crown portion of the head body (for example, see Patent Document 1) A structure in which a PCCP structure is applied to a head body having a hollow structure to promote a reduction in thickness without losing strength is known (for example, see Patent Document 2).

Further, the golf club head is also required to be configured so that the ball hit at the face portion can be easily thrown away even when a beginner or a weak player uses it. As a golf club head capable of flying such a ball far, a plurality of slit-like grooves are provided at predetermined intervals on the inner wall of the crown portion of the head body so that the crown portion is bent at the time of hitting. There is a head structure (see, for example, Patent Document 3).
Japanese Patent Laid-Open No. 11-15598 Japanese Patent Laid-Open No. 11-178957 JP 2003-88601 A

  However, in the golf club head of Patent Document 1, a step portion is formed between the recess and the inner wall of the crown portion, and the change in rigidity is not smooth, and so-called stress concentration occurs on the inner wall of the crown portion. This has the disadvantage of reducing the repulsive force of the hit ball.

  In addition, in the golf club head of Patent Document 2, for example, a triangular structure is arranged, and each side of the arrangement is formed into a polyhedral structure having a concave shape and a convex shape. The stress is concentrated on each side, which similarly has the disadvantage of reducing the repelling force of the hit ball.

  On the other hand, in the golf club head of Patent Document 3, the rigidity of the inner wall of the crown portion is not uniform but partially changed due to the presence of the slit groove, so that stress concentration occurs when the ball is hit, It has the disadvantage that it will bend locally and reduce the repulsive force of the hit ball.

  The present invention has been made in view of the above circumstances, and has a simple configuration, smoothes the change in rigidity, and can efficiently disperse the stress, thereby improving the repulsive force at the time of hitting the ball. An object is to provide a golf club head obtained.

  The present invention provides a golf club head having a hollow structure in which an opening is formed in a head main body having at least a crown portion and a sole portion, and a face portion for hitting a ball is disposed in the opening, and the inner wall of the head main body In addition, a plurality of thin wall portions having curved corners of the peripheral wall are provided at predetermined intervals.

  According to the above configuration, the head body has a curved portion with a curved portion, the stress applied at the time of hitting is distributed over the entire inner wall, and the rigidity is kept substantially uniform. The thin wall portion of the inner wall bends in a well-balanced manner and the ball is repelled efficiently at the face portion. Therefore, the hit ball has a stable directionality and a sufficient flight distance according to the hit ball position.

  As described above, according to the present invention, it is possible to improve the repulsive force at the time of hitting the ball with a simple configuration, smoothing the rigidity change, and efficiently dispersing the stress. Thus, a golf club head can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a golf club head according to an embodiment of the present invention. A head body 10 is crowned by casting, forging, pressing or the like from a suitable metal material such as titanium, titanium alloy, or stainless steel. It is formed in a hollow structure composed of a part 11, a soul part 12, and a face part 13 for hitting a ball. The head body 10 is formed as a metal hollow wood head having a hollow outer shell structure in which the back portion 101 protrudes rearward (see FIG. 2).

  The head body 10 is provided with a shaft fixing portion 14 protruding from the crown portion 11 on the heel portion 102 side. The shaft fixing portion 14 is formed in a cylindrical shape slightly inclined in the heel direction, and the tip of the shaft 15 formed of a metal such as stainless steel or fiber reinforced resin is inserted through the socket 16 and bonded to be fixed. Is done. The protruding length of the shaft fastening portion 14 from the crown portion 11 can be adjusted as appropriate, and is not limited to the structure slightly protruding from the crown portion 11 as shown, but is formed on the same surface as this. Alternatively, it can be recessed.

  Here, the face portion 13 is curved in the direction of the toe / heel portion and slightly curved in the crown / sole direction (see FIGS. 2 and 3), and the sweet spot of the face portion 13 is It is opposed to the center of gravity of the head body 10. A plurality of score lines 131 are directed to the front surface of the face portion 13.

  In the head body 10, for example, a plurality of thin portions 17 are formed on the inner wall of the crown portion 11 with a predetermined interval from the face portion 13 side toward the back portion. As shown in FIG. 4, the plurality of thin wall portions 17 are provided with a bottom surface having a width B and extending from the heel portion 102 of the crown portion 11 toward the toe portion, and including corner portions of the bottom surface. Is formed in a curved shape having a predetermined radius (R) and is continuous with the inner wall of the crown portion 11 (see FIG. 4). As a result, when the thin wall portion 17 hits a ball on the face surface of the face portion 13 and a stress is applied to the face surface, for example, the stress is applied to the thin wall portion of the crown portion 11 via a corner portion having a predetermined radius. It is transmitted so as to be dispersed throughout the crown portion 11 other than 17, so that stress is prevented from concentrating, and the crown portion 11 can be bent in a balanced manner. As a result, the thin-walled portion 17 is regulated so as to bend substantially parallel to the face surface in cooperation with the region other than the thin-walled portion 17 of the crown portion 11 and acts to push out the ball with a substantially parallel repulsive force.

  For example, as shown in FIG. 4, the thin-walled portion 17 has a thickness t1, and when the thickness t2 of the crown portion 11 is 0.8 mm to 1.2 mm, for example, t2 / t1 = 10 to 80%. Is set to 0.6 mm to 0.9 mm. That is, the thickness t1 of the thin portion 17 is set to 60 to 80% when the thickness t2 of the crown portion 11 is 1 mm or less, and is set to 10 to 60% when 1 mm or more.

  For example, when the thickness t2 of the crown portion 11 is 0.8 mm, the thickness t1 of the thin portion 17 is set to 0.7 mm. By setting the thickness t1 of the thin portion 17 and the thickness t2 of the crown portion 11 in this way, the thinning of the crown portion 11 is further promoted by the interaction due to the relationship between the thickness dimensions t1 and t2. At the same time, after setting the desired strength, substantially uniform rigidity is ensured, and durability can be improved.

  With the above configuration, when the ball is hit on the face surface of the face portion 13, the thin portion 17 of the crown portion 11 is bent substantially parallel to the face surface by the hitting force, and the rebound energy is on the face surface side. Concentrated on. At this time, the thin-walled portion 17 is efficiently distributed so that the stress applied when the ball is hit on the face surface of the face portion 13 is distributed to the entire crown portion 11 other than the thin-walled portion 17 of the crown portion 11 through the corner portions having rounded corners. This prevents the stress concentration and keeps the rigidity of the crown portion 11 substantially uniform.

  Accordingly, the thin portion 17 is regulated so as to bend substantially parallel to the face surface in cooperation with the region other than the thin portion 17 of the crown portion 11, and a repulsive force substantially parallel to the face portion 13 is efficiently obtained. Apply well and act like pushing the ball.

  Here, the ball hit by the face surface of the face portion 13 is given an efficient repulsive force through the face portion 13 to increase the initial velocity of the ball and improve the flight distance. At this time, the face portion 13 is given a repulsive force substantially parallel to the face surface by the thin portion 17 of the crown portion 11 even when the ball hitting position is slightly different from the sweet spot. Thus, a stable directionality can be imparted to the ball.

  As described above, the golf club head has a plurality of thin portions 17 whose corners of the peripheral wall are rounded (R) on the inner wall of the crown portion 11 of the head body 10 corresponding to the face portion 13 at a predetermined interval. It was provided and configured.

  According to this, in the head body 10, the inner wall of the crown portion 11 is dispersed by the action of the thin portion 17 having corners having rounded corners, so that the stress applied at the time of hitting is dispersed and the rigidity thereof is kept substantially uniform. As a result, the bending of the thin wall portion 17 of the inner wall is bent in a balanced manner, and the ball is repelled efficiently at the face portion 13. As a result, the hit ball has a stable directionality and a sufficient flight distance according to the hit ball position.

  The present invention is not limited to the above embodiment, but can be configured as shown in FIGS. However, in FIGS. 5 to 7, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  That is, in this embodiment, for example, a thin region 111 is formed on the back side of the inner wall of the crown portion 11 of the head body 10 in correspondence with the thickness t1 of the thin portion 17, and the back region 111 is formed from the thin region 111. To the portion 101, for example, a plurality of ribs 18 are provided at predetermined intervals as shown in FIGS. 6 and 7 (see FIG. 5). The plurality of ribs 18 are arranged substantially orthogonally to the thin portion 17 (see FIGS. 6 and 7), and the rebound energy accumulated by bending of the thin portion 17 is concentrated on the face portion 13 at the time of hitting. , Acts to increase its repulsive force. As a result, it is possible to improve the flight distance of the ball after promoting the weight reduction of the head main body 10.

  In each of the above embodiments, the thin portion 17 has been described as being provided only on the upper surface side of the crown portion 11 of the head body 10. However, the present invention is not limited to this, and the thin portion 17 is, for example, As shown in FIG. 8, the inner wall of the head main body 10 may be configured to extend between the toe portion 103 including the crown portion 11 and the heel portion 102. According to this, it becomes possible to improve the repulsive force, and further, an effective effect can be expected.

  Further, in the above embodiment, the thin portion 17 provided on the inner wall of the crown portion 11 has a width B and is formed by extending the corners of the peripheral wall in the direction of the toe and heel portions. However, the present invention is not limited to this, and the thin portions 19 and 20 can be configured as shown in FIGS. 9 and 10, and substantially the same effect can be expected. However, in FIG. 9 and FIG. 10, the same parts as those in FIG. 1 to FIG.

  In FIG. 9, the thin wall portion 19 is formed in a substantially arc shape having a predetermined curvature, and is formed on the inner wall of the crown portion 11, for example, in a concavo-convex curved surface having a substantially wave shape in cross section. According to this, the bending balance of the crown portion 11 can be further improved, and further effective effects are expected.

  In FIG. 10, the thin portion 20 is formed in a substantially arc shape in which the face surface side of the face portion 13 is deeper than the back portion side. For example, the inner wall of the crown portion 11 has a cross-sectional wave shape. It is configured so as to form an uneven curved surface. According to this, the rebound energy at the time of hitting can be efficiently applied to the face portion side, and further effective effects are expected.

  In addition, the present invention is not limited to the above-described embodiment, and can be configured as shown in FIGS. 11 and 12, and similar effects are expected. However, in FIGS. 11 to 12, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  That is, in this embodiment, the crown portion 11 of the head body 10 is provided with a plurality of rows of, for example, a plurality of oval thin portions 21 arranged at predetermined intervals with their longitudinal directions aligned. Provided. The plurality of thin portion rows are arranged such that the thin portion 21 is positioned in a zigzag shape not facing the thin portion 21 of the adjacent thin portion row, for example. The plurality of thin wall portions 21 arranged in the plurality of thin wall portion rows are continuously formed with their corners having rounded (R) (see FIG. 4 above) or arcuate shapes (see the above drawings). 9 and FIG. 10) and is provided on the inner wall of the crown portion 11.

  By arranging the plurality of thin portions 21 in a staggered manner so as not to face the thin portions 21 of the adjacent thin portion row in this way, the inclination of the face portion 13 can be made constant, and the directionality is further improved. Can be improved.

  In addition, as shown in FIG. 12 (a), the plurality of thin-walled portions 21 are arranged at predetermined intervals in the face-back direction with their respective longitudinal directions facing each other. The rows may be arranged in a staggered manner so that the longitudinal directions of the thin portions 21 of adjacent thin portion rows do not line up. According to this arrangement, the strength of the crown portion 11 can be improved, and the durability can be further improved.

  Further, as shown in FIG. 12B, the plurality of thin-walled portions 21 are arranged at predetermined intervals in the face-back direction with the respective longitudinal directions facing each other. You may arrange | position a row | line | column so that the longitudinal direction of the thin part 21 of the adjacent thin part row | line | column may become one row. According to this arrangement, the crown portion 11 is continuously bent, and the directionality can be further improved.

  Moreover, in the said embodiment, although demonstrated by the case where it comprised so that the substantially oblong thin part 21 might be arrange | positioned in the inner wall of the crown part 11 by multiple rows at predetermined intervals, it is not restricted to this shape, It is also possible to form and form the thin-walled portions 21 of the shape.

  Further, the arrangement range of the thin portion may be configured to be arranged from the toe portion 103 to the heel portion 102 on the inner wall of the crown portion 11. In this arrangement form, it is possible to further improve the repulsive force.

  Therefore, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problems described in the column of problems to be solved by the invention can be solved, and the effects described in the effects of the invention can be obtained. In some cases, a configuration from which this configuration requirement is deleted can be extracted as an invention.

1 is a perspective view showing an external configuration of a golf club head according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a cross section AA of the head body of FIG. 1. It is the perspective view which showed FIG. 1 from the crown part side. It is the enlarged view which expanded and showed a part of FIG. It is sectional drawing which showed the principal part of the golf club head which concerns on other embodiment of this invention. It is the perspective view which showed FIG. 5 from the crown part side. FIG. 7 is a cross-sectional view taken along a line CC in FIG. 6. It is the perspective view which showed the principal part of the golf club head which concerns on other embodiment of this invention. It is the partial cross section figure which showed the principal part of the golf club head which concerns on other embodiment of this invention. It is the partial cross section figure which showed the principal part of the golf club head which concerns on other embodiment of this invention. It is the perspective view which showed the golf club head which concerns on other embodiment of this invention from the crown part side. FIG. 12 is an array diagram showing a modification of the array of thin portions in FIG. 11.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Head body, 101 ... Back part, 102 ... Heel part, 103 ... Toe part, 11 ... Crown part, 111 ... Thin area, 12 ... Sole part, 13 ... Face part, 131 ... Score line, 14 ... Shaft fastening Part, 15 ... shaft, 16 ... socket, 17 ... thin part, 18 ... rib, 19 ... thin part, 20 ... thin part, 21 ... thin part.

Claims (3)

A golf club head having a hollow structure in which an opening is formed in a head body having at least a crown portion and a sole portion, and a face portion for hitting a ball is disposed in the opening portion,
A golf club head characterized in that a plurality of thin portions with corners of the peripheral wall being curved are provided at predetermined intervals on the inner wall of the head body.   The golf club head according to claim 1, wherein the plurality of thin portions are formed in a substantially arc shape having a predetermined curvature on an inner wall of the head body.   3. The golf club head according to claim 2, wherein each of the thin portions is formed in a substantially arc shape in which the face portion side is thinner than the back side.

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