JP2010227359A - Golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club improving and stabilizing a flying distance and stabilizing directionality by improving the balance of deflection near the center position of a ball hitting face. <P>SOLUTION: A face part is formed such that a crown side face area is larger than a sole side area when the face part 7a is vertically divided into the crown side and sole side by a horizontally drawn line X passing the center position C. A thick-walled part 20 is formed at the center position portion on the back face side of the face part, and a plurality of extended parts 20a, 20b are formed extending to the crown side and sole side from the thick-walled part 20. A CT value in a range surrounded by four positions which are the position of 25 mm to the horizontal toe side from the center position, the position of 25 mm to the horizontal heel side from the center position, and the crown side position and sole side position of 20 mm in a vertical direction from the center position on the basis of the CT value in the center position of the face part 7a is made 85% or more of the CT value in the center position, and the center position C is disposed within a range surrounded by the four positions. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a golf club, and more particularly, to a golf club having a hollow structure head.

  In general, when a golf ball is hit with a sweet spot of a club head, efficient repulsion is possible and a long flight distance is obtained, but the area of the sweet spot is actually extremely small. Also, the golfer has a habit of swinging by an individual and does not necessarily hit the ball at the center of the sweet spot or the face.

  For this reason, for example, Patent Document 1 proposes a golf club suitable for a swing form for each golfer by shifting the highest repulsion point of the face of the club head from the center (center position) of the hitting surface. According to such a golf club, it is possible to improve the flight distance by selecting a club head suitable for each swinger's own swing form for each golfer.

JP 2004-267438 A

  According to the known technology described above, although a golf club suitable for an individual golfer can be provided, such a golf club is not necessarily suitable for a general golfer. That is, simply focusing on the position of the highest rebound point and shifting this position from the vicinity of the center of the ball striking face does not necessarily result in a golf club that can be accepted by all general golfers.

  For example, when a golfer hits the toe side with respect to the center position of the hitting surface, if the position of the highest repulsion point is set on the heel side with respect to the center position of the hitting surface, There is a possibility that it will be recognized as a golf club that does not fly as much as expected even if it hits in the central area due to the reduced strength.

  Further, it is desirable that the golf club be configured so that the flight distance can be stabilized and the directionality can be stabilized in addition to the improvement and stabilization of the flight distance. .

  The present invention has been made paying attention to the above-described problems, and can improve the balance of deflection near the center position of the ball striking surface to improve and stabilize the flight distance and to stabilize the directionality. The purpose is to provide clubs.

  The present invention is characterized by paying attention to the bending characteristics of the face portion of the club head in order to solve the above-described problems. That is, when hitting a ball with a club head, it is known that the collapsing of the ball is suppressed by bending the face portion, thereby reducing energy loss due to ball deformation and improving the flight distance. Yes.

  By the way, as a measure for the deflection of the face portion, there is a method of measuring in accordance with the pendulum test of the USGA (American Golf Association). It has been generalized to evaluate the deflection of the part. Specifically, the CT value specifies the center of the face portion (hereinafter also referred to as the center position of the face portion) according to the above-described Pendulum test procedure, and the contact time when a predetermined test piece collides with the center position. Is measured to evaluate the elasticity of the face part. When the CT value becomes high (the contact time becomes long), the face part is easily bent and the flying distance of the ball can be improved. . For this reason, in the above test, if the CT value at the center position of the face portion exceeds a predetermined value, it is determined that the CT value does not conform to the rule.

  The CT value in the face portion is not limited to the central position, but is determined at every predetermined position depending on the face structure such as thickness change, material, and uneven shape (including ribs and grooves formed on the back surface of the face portion). A causal relationship is recognized between the CT value and the ball speed that the ball speed is increased by increasing the CT value at a practical level. For this reason, the position (region) where the CT value is increased, that is, the position (region) where the ball velocity is increased and the ball speed is increased is set to a portion that can be perceived by the golfer as “struck by the core”. It is desirable to place it in the vicinity of the center of the face part where the golfer consciously hits the ball (in the above-described pendulum test, the measurement position is the center position of the face part).

  It should be noted that the point where the perpendicular to the face part from the center of gravity position of the head, the so-called sweet spot, depends on the design of the center of gravity of the head, so it may not coincide with the center position of the face part specified by the above test, The sweet spot is the part where the ball is most captured at the time of hitting, and the head speed can be transmitted to the ball most efficiently. It is desirable to set the position in the vicinity thereof (at least within a radius of 10 mm from the center position).

  As disclosed in Patent Document 1 described above, regarding the CT value of the face portion, if a maximum repulsion point is simply provided around the center position according to the golfer's heel, If the ball is hit at a position symmetrical to the maximum rebound point, the hitting speed may be reduced, and the golf club may be recognized as having no flight distance.

  Therefore, in the present invention, the above-described object is achieved by a golf club equipped with the following club head. That is, the golf club of the present invention has a hollow metal club head having a face portion in which a ball striking surface of a golf ball is formed on the front surface and a bulge is formed on the ball striking surface. When the face portion is divided into a top side and a bottom side on the crown side and the sole side by a horizontally drawn line passing through the center position of the face portion, the face area on the crown side is formed wider than the area on the sole side. By forming a thick part at the center position on the back side of the part and forming a plurality of extensions extending from the thick part to the crown side and the sole side, the CT value at the center position of the face part is used as a reference. Each of a horizontal toe side 25 mm position from the central position, a horizontal heel side 25 mm position, and a crown side position and a sole side position 20 mm vertically from the central position. One of the CT values in the range surrounded by the position, as well as to more than 85% of the CT values in the central position, characterized in that a said central position within the range surrounded by the respective four positions.

  According to the configuration described above, the thick portion is formed in the central position portion on the back surface side of the face portion, and the plurality of extended portions extending from the thick portion to the crown side and the sole side are formed, so that the vicinity of the central position is formed. It is possible to adjust so that the resilience of the surrounding area is approximated to the vicinity of the center position while restricting the resilience at the center. As a result, four positions each of a position on the face surface side from the center position to the horizontal toe side of 25 mm, a position in the horizontal heel side to 25 mm, and a position on the crown side and a position on the sole side of 20 mm vertically from the center position are provided. The CT value in the range surrounded by the positions can be 85% or more of the CT value in the central position, and the central position can be arranged in the range surrounded by each of the four positions.

  As described above, the region having a high CT value is expanded in the horizontal direction (toe / heel direction) and the vertical direction (crown / sole direction), so that even when the hit point of the ball deviates from the center position at the time of hitting, Thus, it becomes possible to obtain a flight distance approximate to the center position, and it is possible to improve and stabilize the average flight distance, which is not possible in the past.

  In particular, the range in the toe / heel direction where the CT value is 85% or more is set to be as wide as 50 mm in the toe / heel direction centering on the center position (even if it is missed, it is within the set range at most). Therefore, in addition to improving the flight distance due to the relationship between the bulge (curvature in the toe / heel direction) applied to the hitting surface and the depth of the center of gravity, it is possible to stabilize the direction. In other words, by forming a bulge, when the hit point position at the time of hitting is shifted in the toe-heel direction, the spin due to the gear effect is suppressed, and even if the hitting speed is high and the flight distance is extended, the gear The degree of direction displacement due to the effect is controlled, and the direction can be stabilized while the flight distance is improved.

  In the above configuration, the crown side and the sole side position of 20 mm in the vertical direction from the center position only need to exist within the range of 20 mm in the vertical direction. For example, the crown at the center position A configuration in which the position on the crown side and the position on the sole side are not symmetrical with respect to the center position, such as 15 mm on the side and 5 mm on the sole side, may be used.

  Note that the vertical position at the center position is set to 20 mm. If the ball hits the edge of the face, the ball flies in an abnormal direction (drop or tempura), but before this complete miss shot state occurs. In addition, this is to make it easy to detect a miss shot in a state that is clearly out of the high repulsion region. Thereby, even when the ball is flying in a normal direction, the swing can be adjusted (awareness), and OB and the like can be prevented.

  The CT value set to 85% or more is determined by comparison with the CT value at the center position of the face portion (hereinafter referred to as CTc). When a ball is hit, high resilience is obtained (in the present invention, a CT value of 85% or more is set as a high repulsion region), and the hitting speed can be improved. For this reason, in the above-mentioned range (positions excluding the central position), there may be a position or region of 100% or more with respect to CTc.

  According to the present invention, it is possible to obtain a golf club that improves the balance of deflection in the vicinity of the center position of the ball striking surface, and improves and stabilizes the flight distance and stabilizes the directionality.

1 is a front view showing a golf club according to a first embodiment of the present invention. The front view of a head part. The back view of a face part. Sectional drawing (longitudinal sectional drawing) along the AA line of FIG. In the structure shown in FIG. 3, a cross-sectional view taken along the line BB (a cross-sectional view of a thick portion and an extension portion). The figure which shows the contour-line distribution for every CT value in a face part. It is a figure which shows 2nd Embodiment of the golf club which concerns on this invention, and is a back view of a face part. FIG. 8 is a longitudinal sectional view of a head including the face portion shown in FIG. 7. FIG. 8 is a cross-sectional view (cross-sectional view of a thick portion and an extension portion) taken along the line CC in the structure shown in FIG. 7. The figure which shows the contour-line distribution for every CT value in the face part shown in FIG. It is a figure which shows 3rd Embodiment of the golf club which concerns on this invention, and is a back view of a face part. It is a figure which shows 4th Embodiment of the golf club which concerns on this invention, and is a back view of a face part. It is a figure which shows 5th Embodiment of the golf club which concerns on this invention, and is a back view of a face part.

Hereinafter, embodiments of a golf club according to the present invention will be described.
FIG. 1 to FIG. 5 are views showing a first embodiment of a golf club according to the present invention. FIG. 1 is a front view of the golf club, FIG. 2 is a front view of a head portion, and FIG. 4 is a cross-sectional view taken along line AA in FIG. 2 (longitudinal cross-sectional view). FIG. 5 is a cross-sectional view taken along line BB in the structure shown in FIG. It is sectional drawing of a thick part and an extension part.

  The golf club 1 according to the present embodiment is configured by fixing a head 7 set to a specified lie angle and loft angle with respect to a reference horizontal plane P at the tip of a shaft 5 made of metal or FRP. ing. In this case, the head main body 7A constituting the head 7 includes a face portion 7a having a hitting surface 7B, a crown portion 7b extending rearward from the upper edge of the face portion 7a, and a rearward extending from the lower edge of the face portion 7a. A protruding sole portion 7c and a side portion 7d extending from the toe side edge of the face portion to the heel side edge of the face portion and connecting the edges of the crown portion 7b and the sole portion 7c. It is formed in the provided hollow structure. In the drawings, the toe portion, the back portion, and the heel portion constituting such a side portion 7d are indicated by reference numerals 7e, 7f, and 7g, respectively.

  The head body 7A is integrated by casting, for example, a titanium alloy (Ti-6Al-4V, Ti-15V-3Cr-3Sn-3Al), an aluminum alloy, or a magnesium alloy except for the face portion 7a. The face member 8 constituting the hitting surface of the face portion 7a, which will be described in detail below, is fixedly attached to the front surface side. In this case, the head main body 7A is formed by individually forming each member (face portion, crown portion, sole portion, side portion; outer shell member) and fixing them by welding, bonding, or the like. It may be.

  Further, a hosel part (not shown) for fastening the tip of the shaft 5 is integrally formed in the head main body 7A. The shaft 5 is fixed to the hosel part by fitting a tip part through a shaft insertion hole 9 formed in the crown part 7b.

  The face portion 7a is a portion where a hit ball is actually formed, and is constituted by a face member 8 that is separately attached to the crown portion 7b, the sole portion 7c, and the side portion 7d. The face member 8 constituting the face portion 7a is, for example, titanium, titanium alloy (Ti-15V-3Cr-3Sn-3Al, Ti-6Al-4V, SP700, Ti-15V-6Cr-4Al, Ti-15Mo-5Zr). -3Al, Ti-30Nb-10Ta-5Zr, etc.) are integrally formed in a plate shape by pressing or forging, etc., and the opening end faces on the front side of the crown portion 7b, sole portion 7c and side portion 7d It is fixed to. In this case, the face member 8 is fixed to the opening end face on the front side of the crown portion 7b, the sole portion 7c, and the side portion 7d by welding, but other than that, for example, brazing, adhesion, laser welding, etc. May be fastened.

  Further, as shown in FIG. 2, the face portion 7a has a face surface (ball striking surface to be hit) 7B when viewed from the front. The face surface 7B is a region surrounded by a top edge 7P that defines the upper and lower sides, a sole edge 7Q, and a side edge 7R. That is, with respect to the face surface 7B, when the head main body 7A is viewed from the front, the ridge line (the top edge 7P, the sole edge 7Q, And the side edge 7R) (when the ridge is curved, it is defined by the curved top). In this case, a score line 7S may be separately formed on the face surface 7B, or the colors may be classified by colors or the like so that the face surface 7B becomes clear.

  The face member 8 may have a configuration in which a flange is formed on the front side of the crown portion 7b, the sole portion 7c, and the side portion 7d, and the face member 8 is fitted into an opening defined by the end face of the flange and fixed. Alternatively, the face member 8 is not formed in a plate shape, but is formed so that the periphery thereof is bent into a cup shape, and the bent portions are formed on the crown portion 7b, the sole portion 7c, and the side portion 7d. You may fix to an opening end surface. Alternatively, the face portion 7a may be integrally formed with the head main body 7A instead of fixing the face member 8 as a separate member.

  The face portion 7a is formed with, for example, a roll that curves along a crown / sole direction (hereinafter also referred to as an up / down direction) and a toe / heel direction (hereinafter referred to as a left / right direction). ), And a central position C of the face portion (face surface) specified in accordance with the above-described pendulum test procedure exists in the top region of both curved portions.

  The face portion 7a of the present embodiment is a line (indicated by X in FIG. 2) that passes through the central position C and is parallel to the reference horizontal plane P when the golf club 1 is held at a specified lie angle with respect to the reference horizontal plane P. When the horizontal line X is drawn, the crown-side face area (upper face area) Au is formed wider than the sole-side face area (lower face area) Ad.

  Note that the height (the height in the crown / sole direction) H of the face surface 7B is defined by a portion where a perpendicular line Y passing through the center position C from the reference horizontal plane P intersects the top edge 7P and the sole edge 7Q. The width (length in the toe-heel direction) W of the surface 7B is defined by a portion where the horizontal line X passing through the center position C intersects the side edge 7R. In the present embodiment, the center position C of the face surface 7B is set to be intermediate between the width W in the toe / heel direction and intermediate in the height H in the crown / sole direction. The length H is 50 mm, and the width W is 100 mm.

  In this case, the face portion 7a is preferably somewhat large so that the above-described effects of the present invention can be effectively achieved. Specifically, the face portion 7a preferably has a face surface height H of at least 46 mm or more and a width W of at least 90 mm or more.

  The face portion 7a configured as described above is configured such that the CT value changes according to the position where the hit ball is formed. In order to change the CT value according to the hit ball position, it can be realized by the configuration of the face part (face member) itself, for example, the thickness change depending on the constituent material and position (region), etc. This can be realized by integrally forming additional structures on the back surface of the face part, for example, ribs, grooves, recesses, protrusions, etc., or by bonding or welding. Of course, for additional structures, for example, the CT value can also be changed by changing the height, thickness, formation position and shape of the ribs and protrusions, or by changing the depth and width of the grooves and recesses and the formation position. Can be changed.

  In the present invention, the face portion 7a configured as described above has a horizontal direction from the center position C with respect to the CT value when the CT value at the center position C of the face portion (referred to as CTc value) is used as a reference. A range surrounded by four positions of 25 mm on the toe side, 25 mm on the heel side, and 20 mm in the vertical direction from the central position C on the crown side and the sole side (the two positions are arbitrary) Is set to be 85% or more of the CT value at the center position C (high repulsion region), and the center position C is arranged within the range surrounded by the four positions. It ’s fine.

  As described above, the range in the toe-heel direction where the CT value is 85% or more is preferably formed over a wide range more than twice the crown / sole direction, with the center position C as the center. By setting the CT value of the region (rectangular region) surrounded by the above four points to be 85% or more, the flying distance is improved and stabilized by using a wide area along the face shape. It becomes easy to plan.

  Here, the CT value was set to 85% or more when the ball was hit on the face surface, even when compared with the center position, high resilience was obtained without much reduction in speed, and the flight distance was large. It is because it does not decrease. Of course, as long as it is within the above range, there may be a position or region of 100% or more with respect to CTc.

  In the present embodiment, as described later, the thickness of the face member 8 is changed, and a thick portion (rib) is integrally formed on the back surface of the ball striking surface 7B so that the above-described conditions are satisfied. ing. That is, a thick portion (rib) is formed on the back surface so that the CT value on the ball striking surface is distributed as described above, and a bent portion (crown portion, side portion, sole portion) from the central region to the edge region is formed. The above CT value distribution can be obtained by appropriately changing the thickness over the bent portion that forms the front end portion of the portion.

  Hereinafter, the distribution state of the CT value of the face portion 7a and a configuration example of the face portion for obtaining such a distribution state will be specifically described.

The face portion 7a of the present embodiment is formed so that the distribution is in the state shown in FIG. 6 when the CT value is measured. This figure is based on the CTc value measured at the center position C (the actual CTc value is 221 × 10 ⁻⁶ seconds, and this value is taken as 100%), the crown / sole direction, and the toe · The heel direction is shown in units of 5 mm, and the distribution of CT values is shown as contour lines for each predetermined ratio. In this figure, the numerical value on the horizontal axis indicates the distance in the toe / heel direction with C as the center position, and the vertical axis indicates the distance in the crown / sole direction with C as the center position. The toe direction and the crown direction are shown, respectively.

  In the distribution state shown in FIG. 6, the contour lines of the CT value distribution are displayed every 5%, the area A1 is a region having a CT value of 100% or more with respect to the CTc value, and the area A2 is the CTc value. Area A3 has a CT value of 95% to 100%, area A3 has a CT value of 90% to 95% with respect to the CTc value, and area A4 has a CT value of 85% to 90% with respect to the CTc value. The area | region which has CT value of this is shown.

  In FIG. 6, the sweet spot of the club head of the present embodiment is present at the position indicated by SS, but this position preferably coincides with the central position C as described above. A range within a radius of 10 mm from the position C may be used. Further, the distribution range of the contour lines shown in FIG. 6 corresponds to a region M surrounded by a dotted line in FIG.

  As shown in the contour line distribution of FIG. 6, the face portion of the present embodiment has a position of 25 mm on the toe side in the horizontal direction from the center position C (position indicated by Xt) and a position of 25 mm on the heel side (indicated by reference sign Xh). Position) and a CT value in a range surrounded by four positions of the crown side and the sole side (arbitrary) of 20 mm vertically from the center position C is 85% or more of the CT value at the center position. It is configured as follows. In this case, the position on the crown side is indicated by Yc, and the position on the sole side is indicated by Ys. Although the position in the vertical direction of Yc and Ys is arbitrary, it is sufficient that the distance between them is at least 20 mm. (In the figure, for convenience, Yc is set to +15 mm and Ys is set to −5 mm). Further, the center position C may be formed so as to be disposed within a range surrounded by each of the four positions Xt, Xh, Yc, Ys.

  The face portion of the present embodiment has a toe-heel direction range of ± 25 mm and a crown direction +15 mm with the center position C as the center, as shown in the contour line distribution of FIG. The CT value is 85% or more in the entire range of the sole direction of −10 mm, and a highly repellent face surface is realized. Of course, the CT value may be set higher within the above range around the center position C as long as it is within the regulation range.

  In the present embodiment, the area A1 having a CT value of 100% or more with respect to the CTc value is formed relatively wide in the toe-heel direction, so that even if the hit points vary in the toe-heel direction. The head can obtain a stable flight with little flight distance loss. As described above, the crown-side face area Au is larger than the sole-side face area Ad (see FIG. 2), and the area A1 has a CT value of 95% or more with respect to the CTc value. , A2 are distributed more widely on the crown side than on the sole side, so that the resilience of the sweet spot position above the center position is improved (repels efficiently) and the flying distance can be improved. . As described above, the high repulsion region is desirably distributed more widely on the crown side than on the sole side, but on the contrary, the sweet spot is lower than the central position, and the characteristics of improving the flight distance with a low and high trajectory are provided. In the case of an obtained head, a configuration in which the high repulsion region is widely formed on the sole side may be employed. About such a structure, what is necessary is just to shift the thick part mentioned later to the upper side (crown side) rather than the center position C, for example.

  Further, as described above, the region surrounded by the above four positions may include a region (position) having a CT value of 100% or more, and further, from the area A2 to the area A4 shown in the figure. The region may include a region (position) that partially has a CT value of 100% or more. In the present embodiment, a region having a CT value of 103% with respect to the CTc value partially exists in the area A1 due to a rib described later.

  As described above, the high repulsion region (region where the CT value is 85% or more of the central position C) can be understood from the contour line distribution of FIG. It is desirable that the heel direction is long. That is, as described above, the bulge is formed in the face portion along the toe-heel direction. By increasing the resilience in this direction, the flight distance and directionality can be improved. It becomes possible.

  In particular, with respect to the central region of the face portion, a width of ± 25 mm in the toe / heel direction centered on the central position C and a width of 10 mm in the crown / sole direction (preferably increasing the range on the crown side). It is desirable to set the CT value in the range to be 95% or more of the CTc value at the center position.

  In this embodiment, as shown in the contour distribution in FIG. 6, such areas correspond to areas A1 and A2, and are near the center position C (slightly closer to the crown side) along the toe-heel direction. Thus, a region that is in a high repulsion state (with a CT value of 95% or more) is formed in a wide range.

  Alternatively, in the face portion described above, it is desirable that the CT value in the range of 15 mm from the center position C to the crown side and ± 25 mm in the toe-heel direction should be 90% or more of the CTc value at the center position C.

  In the peripheral region beyond the range shown in FIG. 6, the face portion may have a configuration in which the CT value gradually decreases as it moves to the peripheral portion, or a configuration in which the CT value decreases extremely (for example, a CT value of 50). %) Or less). By configuring as in the former, even if the ball is hit in an area exceeding the range shown in FIG. 6, it can be a golf club that does not significantly reduce the flight distance, and by configuring as in the latter, When a ball is hit in an area exceeding the range shown in FIG. 6, it can be a golf club that makes it easy for a golfer to sense that a shot has been missed.

  The face portion shown in FIGS. 2 to 5 has a structure that can efficiently obtain the CT value distribution shown in FIG. The structure will be specifically described below.

First, the relationship between the CT value and the structure of the face portion will be described.
As described above, the CT value is the contact time with the face portion when the ball is hit, and the higher this value, the easier it is to bend, and the flight distance of the ball can be improved. Usually, the deflection characteristics of the face portion depend on the material, but greatly depend on the thickness and the distance from the edge region of the face portion. In other words, by reducing the wall thickness, the face part itself is easily bent, and the area farthest from the edge area (usually the area at the center of the face part) is easily bent. The CT value in the region tends to be high. In addition, for example, by forming a thin part or forming a recess partly, the bending rigidity of the periphery thereof is reduced and it becomes easy to bend, so the CT value can be improved.

  On the other hand, the CT value is suppressed because the amount of bending is small in areas with high rigidity, such as the edge area of the face part (the connection part between the crown part, side part, and sole part, which are the support areas around the face part). Is possible. In addition to this, for example, by increasing the thickness of the connecting portion, it is possible to suppress the CT value by making the region at the center position difficult to be bent, or there is a change in the thickness of the face portion itself. It is also possible to suppress the bending of the region surrounded by the thick portion (the bending rigidity decreases and the CT value decreases). Furthermore, it can be suppressed by forming a rib or the like (the CT value is reduced around the rib).

  In order to obtain the CT value distribution as shown in FIG. 6 (the region where the CT value is high is formed long along the toe-heel direction), for example, the center region It is conceivable that ribs (thick portions) are arranged on the inner wall to suppress the bending in the central region to some extent. That is, if the structure does not form ribs at all in the face portion, the CT value in the center region can be increased, but in the region approaching the edge in the toe-heel direction, the rigidity increases rapidly and the CT value decreases extremely. However, in the area where the center area is somewhat difficult to bend and the area close to the edge in the toe-heel direction can be approximated to the center area and the amount of bending, the entire face part can be It is considered that the CT value in the toe-heel direction can be adjusted to an approximate and high state. In addition to such ribs, it is also possible to achieve more effectively by gradually reducing the wall thickness as the center region moves to the toe side and the heel side.

  In the present embodiment, a rib having a special shape is integrally formed on the face portion 7a, and the CT value distribution as described above is efficiently obtained by changing the thickness of a region where the rib is not formed. It is composed. That is, the thickness of the face portion 7a is in the range of 2.0 to 2.4 mm, or 1.8 to 2.6 mm so that the CT value of the central region of the face portion is high. The thick portion (rib) 20 is formed in the central position portion so that the bending characteristics in the toe-heel direction approximate to the central region while being formed and suppressing the bending in the central region. . In this case, if the thick portion 20 is too thick, the resilience decreases and the weight becomes heavy. Conversely, if the thickness is too thin, the rebound cannot be suppressed. It is preferable to set to 7.0 mm.

  As shown in FIG. 3, the center position C is set to be within the range of the thick portion 20 at least in the toe-heel direction, and preferably in the crown / sole direction, the thick portion It is set to be within the range of 20. In the configuration shown in the figure, the center position C exists at a position that is substantially the center of the thick portion 20.

  As described above, the center position C is preferably set so as to be approximately the center position of the thick portion 20 as described above. However, the center position C is a position that is approximately the center of the thick portion 20. May be near (within a radius of 10 mm). For example, the center position C may be shifted slightly upward (for example, about 2 to 10 mm above) from the substantially center position of the thick part 20 (the center position C may be displaced from the thick part 20 toward the crown side). ), The rebound on the crown side can be relatively increased (the CT value can be increased). Alternatively, the resilience on the sole side can be relatively increased by setting in reverse. That is, if the thick portion 20 is shifted to the sole side with respect to the central position C, the resilience on the crown side is enhanced, and if the thick portion 20 is shifted to the crown side, the resilience on the sole side is enhanced. It is done.

  In this embodiment, the thick portion 20 formed in the central position portion has a shape that is longer in the horizontal direction than in the vertical direction. Specifically, as shown in FIG. 3, the thick portion 20 passes through the central position C of the face portion. The horizontal width w (in the range of 10 to 30 mm) in the horizontal line portion that passes through the center position C of the face portion, rather than the vertical width h (in the range of 5 to 15 mm) in the vertical portion to be It is good to be long). Thereby, the extended characteristic can be obtained without excessively suppressing the resilience on the crown side and the sole side.

  In the present embodiment, the region shown in FIG. 6, that is, a region surrounded by ± 25 mm in the toe-heel direction from the center position C, +10 mm on the crown side, and −10 mm on the sole side (such a region is illustrated in FIG. 3), the thick portion 20 that is long in the left-right direction is present, and in combination with the action of the following extension portions 20a and 20b. The CT value in the region M shown in FIG. 3 can be ensured to be 85% or more with respect to Ctc.

  The thick portion 20 is formed with a plurality of ribs (extension portion 20a; crown side, extension portion 20b; sole side) so as to extend toward the crown side and the sole side, respectively. Centering on the thick-walled portion 20 formed in the part, while suppressing the bending in the central region, the decrease in the bending in the surrounding region (toe / heel side and surrounding region on the crown / sole side) is effectively suppressed. Thus, CT values similar to those in the central region can be secured over a wide range in the toe / heel direction and the crown / sole direction.

  That is, in addition to the thick portion 20, the extended portions 20 a and 20 b are formed to expand the high repulsion region that approximates the center position C with good rebound in the toe-heel direction and the crown-sole direction (in this embodiment, Since the face area on the crown side is large, the area of high repulsion can be expanded on the crown side rather than on the sole side), so that even if the ball hit point deviates from the center position at the time of hitting, it approximates the center position This makes it possible to obtain an improved flight distance and to improve and stabilize the average flight distance, which has not been achieved in the past.

  In the present embodiment, two extended portions 20b are formed on the crown side and the sole side with respect to the thick portion 20 formed in the central position portion, preferably from the left and right ends of the thick portion 20, It forms so that it may extend in the direction which spreads right and left toward the crown side and the sole side. Accordingly, the thick portion 20 and the extension portions 20a and 20b integrated with the thick portion 20 are formed in a substantially H shape or X shape when seen in a plan view. As it approaches, the shape gradually expands in the left-right direction.

  As described above, by forming the thick portion 20 longer in the left-right direction than in the up-down direction, it is possible to easily adjust the resilience in the left-right direction while regulating the resilience at the center position, and By forming the extension portions 20a and 20b so as to gradually spread in the direction, it is possible to prevent a decrease in the resilience in the vertical direction, although the thick portion is extended in the vertical direction. As a result, the resilience in the left-right direction can be easily adjusted while restricting the resilience at the center position, and a face portion having a CT value portion as shown in FIG. 6 can be easily formed. That is, by forming the thick part 20 and the extension parts 20a and 20b as described above, the face part has four divided thin areas (crown side area 25, sole side as shown in FIG. 3). Area 26, toe side area 27, and heel side area 28) are formed, and in the ranges shown in FIG. 6 in these areas (the range indicated by the dotted line in FIG. 3), the CT value can be easily set as in the central position. Can be set to 85% or more.

  In the above-described configuration, the extents of the extension portions 20a and 20b to the left and right (inclination angle with respect to the horizontal plane) are adjusted as appropriate, but the ends (most toe side and heel side) of each extension portion 20a and 20b are adjusted. With respect to the position P1), a horizontal line is drawn from the central position C, and at a position 25 mm in the left-right direction, a perpendicular line (corresponding to Y1 of the dotted line in FIG. 3) is used as a reference. It is preferable to form so that it may be located in a range.

  By configuring in this way, it becomes possible to approximate the resilience in the range in which the resilience is regulated, and it is easier to achieve the approximation while improving the CT value in the peripheral portion of the center position C. (Repulsiveness can be adjusted more efficiently).

  In addition, regarding the width (width in the direction along the face surface) t of each of the extension portions 20a and 20b, if the thickness is excessively increased, the flexibility is significantly deteriorated, and if the thickness is excessively reduced, the extension portion is formed. Since it becomes impossible to achieve a uniform CT value (approximate resilience) in the peripheral region of the central position C, it is preferable to set it in a range of 2 to 8 mm.

  Further, as shown in FIG. 5, the thickness of each of the extension portions 20a and 20b (thickness in the thickness direction of the face portion) is changed as the thick portion 20 moves from the central region to the edge region. It is preferable to gradually reduce the thickness (FIG. 5 shows a cross-sectional view along the line BB in FIG. 3, but the cross-sectional view along the line B′-B ′ has the same configuration. ) Each extension portion 20a, 20b extends to a position reaching the edge PE on the back surface of the face portion, and as shown in FIG. 4, each end portion reaches the inner surface of the crown portion and the inner surface of the sole portion. It is configured.

  As described above, the thickness of the extension portions 20a and 20b is gradually reduced as the thickness shifts to the edge region, so that the repulsion in the vertical direction is achieved despite the fact that the thickness portion is extended in the vertical direction. In addition, it is possible to easily adjust the resilience in the left-right direction while restricting the resilience at the center position.

  In this case, the thickness (including the face thickness) of the extension portions 20a and 20b may be changed within a range of 2.0 to 5.0 mm, and the thickness is reduced to a taper shape as shown in FIG. Alternatively, it may be displaced step by step. Alternatively, a tapered shape and a stepped shape may be combined.

  Further, in the above-described configuration, the thick portion 20 and the extension portions 20a and 20b are formed, so that four divided thin areas (crown side area 25, sole side area 26, toe portion as shown in FIG. 3). The side area 27 and the heel side area 28) are formed, and it is preferable that the peripheral side of each area has a uniform thickness. Here, the peripheral side is within 8 mm inward from the peripheral edge of the face member, and the peripheral region (peripheral side) has a uniform thickness (preferably, 2.0 to 2.6 mm) over the periphery. By adjusting the thickness of the center area of the face part, the resilience can be approximated to the center position, and at the same time, the resilience at the periphery of the face part can be stabilized, and the resilience approximated in a wider range can be achieved. Can be obtained.

  The uniform thickness described above may be within a range of ± 0.2 mm, preferably within a range of ± 0.15 mm in consideration of variations in thickness.

  In addition, the four divided thin areas 25 to 28 may have the same thickness in the areas, but it is preferable to gradually reduce the thickness as they move to the peripheral side. With this configuration, it becomes possible to more easily approximate the resilience to the center position.

  The function and effect of the golf club equipped with the club head having the face portion as described above will be described.

  According to the golf club equipped with the club head having the above-described configuration, the high resilience region (CT value of 85% or more) approximated to the center position C having good resilience is expanded in the toe-heel direction, and in the crown-sole direction. Therefore, even when the hit point of the ball deviates from the center position at the time of hitting, it is possible to obtain a flight distance that approximates the center position, and it is possible to improve and stabilize the average flight distance that has not existed before It becomes like this.

  In particular, the range in the toe / heel direction where the CT value is 85% or more extends over a wide range of more than twice the crown / sole direction, with the center position C as the center and 50mm wide in the toe / heel direction. Because it is set, the distribution balance of the high repulsion area is improved in the vertical and horizontal directions, and in addition to improving the flight distance by interacting with the bulge applied to the hitting surface, it is possible to stabilize the direction It becomes. In other words, by forming a bulge, when the hit point position at the time of hitting is shifted in the toe-heel direction, the spin due to the gear effect is suppressed, and even if the hitting speed is high and the flight distance is extended, the gear Although the degree of direction displacement due to the effect is suppressed and the flight distance is improved, the direction can be stabilized (the fairway keep rate can be improved).

  Further, the CT value in the range of 25 mm on the toe side and 25 mm on the heel side in the horizontal direction from the central position C and a width of 10 mm in the crown / sole direction is 95% or more of the CT value at the central position. As a result, the above-described effects can be achieved at a higher level, and an excellent golf club can be provided.

  In addition, the CT value in the range surrounded by 15 mm from the center position C on the crown side, 25 mm on the toe side in the horizontal direction, and 25 mm on the heel side is 95% or more of the CT value at the center position C. In addition to the above-described effects, the high repulsion region is formed so as to be slightly on the crown side with respect to the center position C. Therefore, even if the hit point of the ball varies in the vertical direction at the time of hitting, the flight distance is improved. Stabilization can be achieved.

  In other words, the roll shape formed on the ball striking surface makes the loft stand below the center position and the spin rate is suppressed, so the flight distance is easy to come out, but the flight distance is somewhat suppressed by making the repulsive force relatively small. can do. In addition, the loft becomes larger above the center position, and the amount of spin increases and the flight distance tends to decrease. However, the reduction in the flight distance can be prevented by relatively increasing the repulsive force. Thereby, even when the hit points of the ball vary in the vertical direction at the time of hitting, the flight distance can be improved and stabilized.

  In the above-described configuration, the thick portion 20 that suppresses the CT value is formed in the vicinity of the center position C, and the thick portion 20 gradually extends in the left-right direction toward the crown / sole side. By forming 20a and 20b, it is possible to prevent a decrease in the resilience in the vertical direction of the center position C, and it is possible to easily adjust the resilience in the left-right direction while restricting the resilience at the center position. This makes it easy to construct a club head that exhibits the above-described effects.

Next, another embodiment of the present invention will be described.
FIGS. 7 to 10 are views showing a golf club according to a second embodiment of the present invention. FIG. 7 is a rear view of the face portion, and FIG. 8 is a view of the head having the face portion shown in FIG. FIG. 9 is a longitudinal sectional view, FIG. 9 is a sectional view (cross-sectional view of a thick portion and an extended portion) along the line CC in the structure shown in FIG. 7, and FIG. 10 is a face portion shown in FIG. It is a figure which shows the contour-line distribution for every CT value in.

  In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the embodiment described above, the extension portions 20a and 20b formed in the thick portion 20 both extend to the position reaching the edge PE on the back surface of the face portion as shown in FIG. As described above, each end portion is configured to reach the inner surface of the crown portion and the inner surface of the sole portion.

  In the present embodiment, the end portion 20d of the crown-side extension portion 20a is terminated at a position that does not reach the edge PE on the back surface of the face portion, whereby the end portion of the extension portion 20a becomes the inner surface of the crown portion 7b. (The notch is formed by notching the end of the extension). Specifically, with respect to the notch length, if it is too short, bending on the crown side is suppressed, the resilience is reduced, and if it is too long, the center resilience cannot be suppressed. It is preferable to form in the range of 2-10 mm.

  The face member 8 having the extension 20a having such a shape can be formed by, for example, integrally forming by forging or casting and then cutting the extension formed to the edge by machining. Or you may integrally form the face member which has an extension part with such a notch part at the time of forging or casting. Further, a part of the extension may be left on the back surface of the face so that the face is not broken or damaged from the notched portion.

  According to the configuration described above, it is possible to prevent a decrease in resilience on the crown side despite extending the thick portion 20 in the vertical direction, so as shown by the contour distribution in FIG. A region having a high CT value (area A1) can be formed on the crown side as a whole, and the resilience in the left-right direction can be easily adjusted while restricting the resilience at the center position.

  Of course, in the configuration described above, the end portion of the extension portion 20a formed on the crown side is notched, but a similar notch portion may be formed on the sole side or only on the sole side. . Thus, by cutting out the end of the extension, it is possible to increase the region having a high CT value and easily shift such a region to the crown side or the sole side.

  FIG. 11 is a view showing a third embodiment of the golf club according to the present invention, and is a rear view of the face portion.

  In the present embodiment, the auxiliary thick part 30 having a thickness smaller than the thickness of the thick part 20 is provided in the four thin areas defined by forming the thick part 20 and the extension parts 20a and 20b. Is forming.

  Specifically, in the present embodiment, the auxiliary thick portion 30 having the same shape (cross shape) is formed on the horizontal line X passing through the center position C of the face portion in the toe side area 27 and the heel side area 28. . Such an auxiliary thick part 30 is adjusted so that the CT values of the toe side area 27 and the heel side area 28 divided on the left and right sides do not become too high, and the position where the auxiliary thick part is formed, The shape, thickness, etc. can be appropriately modified. That is, by forming the thick portion 20 in the central region, if the CT value in the central region is lowered and there is a possibility that the CT value in the toe-heel direction is increased, such an auxiliary thick portion By appropriately forming, it is possible to more easily adjust the distribution balance of the high repulsion area in the left-right direction.

  Further, in the configuration as described above, a rib-like thick part (which connects the auxiliary thick part 30 and the thick part 20 and / or the extended parts 20a, 20b formed in the central position part) ( (Not shown) may be formed.

  In the structure having such a rib-like thick part, the influence of the thick part 20 that restricts the resilience can be used also for the auxiliary thick part 30, so that the resilience can be controlled more effectively. It becomes possible to do. In this case, the rib-like thick part can be appropriately modified such as how to connect to the thick part 20 and the connecting parts 20a and 20b, and the thickness and width.

  Further, if the auxiliary thick part 30 as described above is formed in both thin areas of the toe side area 27 and the heel side area 28, the center position (indicated by reference numeral 30a) is the thin area. Preferably, it is formed closer to the face center than the center.

  That is, the auxiliary thick part 30 only needs to be formed so as to be biased toward the center as a whole. Specifically, as shown in FIG. 11, the auxiliary thick part 30 is arranged in the horizontal direction from the center position 30a of the auxiliary thick part 30. For the length La up to the side edge and the length Lb up to the thick wall portion 20, an auxiliary thick wall portion is formed so that La> Lb and is formed closer to the center in the area. It is preferable to keep it.

  By setting the position of the auxiliary thick part in this manner, the region where the resilience in the left-right direction is good (the region where the CT value is 85% or more) is changed from the center position of the face portion to the toe direction and the heel. In the direction, it is possible to expand to a range exceeding 25 mm, and it is possible to expand the high repulsion region more widely in the toe-heel direction.

  FIG. 12 is a view showing a fourth embodiment of the golf club according to the present invention, and is a rear view of the face portion.

  The auxiliary thick part 30 of the above-described embodiment is formed in the thin areas 27 and 28 on the toe side and the heel side in the divided thin area, but the auxiliary thick part is formed in any region. Or may be formed over the entire region.

  The auxiliary thick part 31 shown in FIG. 12 is configured as a substantially elliptical rib so as to surround the thick part 20 in the central position portion over all the thin areas. Thereby, the resilience is suppressed in the entire periphery of the thick portion 20.

  According to such a configuration, it becomes possible to radially expand a region where the resilience is good (a region where the CT value is 85% or more) to the peripheral region of the central position portion. In addition, it is possible to form a high repulsion region wider.

  The auxiliary thick part 31 having the above-described configuration has a rib shape that surrounds the thick part 20 in the central position portion. A structure in which the radially inner side is thickened in a planar shape or the thickness is changed in a tapered shape may be employed.

  Moreover, about the above-mentioned auxiliary | assistant thick part, you may form in a partly divided thin area, and as shown in embodiment of FIG. 13, the auxiliary | assistant thick part 30 shown in FIG. The auxiliary thick part 31 shown in FIG.

  Alternatively, in the vicinity of the edge region of the face portion, the bending rigidity increases and the CT value decreases, so that a concave portion (groove portion) is formed in such an edge region to suppress the CT value from decreasing. The repulsion area may be expanded wider.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to above-described embodiment, It can change variously.

  In the present invention, from the center position C of the face part of the club head, a position of 25 mm on the toe side in the horizontal direction and a position of 25 mm on the heel side, and a position on the crown side and the sole side of 20 mm in the vertical direction from the center position C (arbitrary The CT value of the range surrounded by each of the four positions is 85% or more of the CT value at the central position, thereby improving the flight distance and stabilizing the directionality. is there.

  Actually, specific means for setting the CT value distribution in a high repulsion state over a wide range along the toe-heel direction and the crown-sole direction can be modified as appropriate, and the flesh of the face portion can be appropriately changed. This can be realized by changing the thickness, the structure of the ribs, the formation of grooves and irregularities, and the like.

  For example, the arrangement position, size, and thickness of the thick portion 20 and the extension portions 20a and 20b, the number of extension portions formed, the length thereof, and the like can be appropriately changed. In addition, the configurations of the above-described embodiments may be implemented in combination as appropriate. Further, the structure of the head body other than the face part described above is not particularly limited.

DESCRIPTION OF SYMBOLS 1 Golf club 5 Shaft 7 Head 7A Head main body 7B Face surface 7a Face part 7b Crown part 8 Face member 20 Thick part 20a, 20b Extension part 30, 31 Auxiliary thick part C Center position

Claims (9)

A golf club having a hollow metal club head having a face portion in which a ball striking surface of a golf ball is formed on the front surface and a bulge is applied to the ball striking surface,
The face portion is formed such that the face area on the crown side is wider than the area on the sole side when the face portion is divided into a top and bottom on the crown side and the sole side by a line drawn horizontally through the center position of the face portion,
A CT value at the center position of the face portion is formed by forming a thick portion at the center position portion on the back side of the face portion and forming a plurality of extensions extending from the thick portion to the crown side and the sole side. With reference to the center position, the position is 25 mm from the center position to the horizontal toe side, the position from the horizontal heel side to 25 mm, and the position of the crown side and the sole side of 20 mm vertically from the center position. The golf club is characterized in that the CT value of the range to be set is 85% or more of the CT value at the center position, and the center position is arranged within the range surrounded by the four positions. The thick part formed in the central position part is formed so that the width in the left-right direction is longer than the width in the vertical direction,
2. The golf club according to claim 1, wherein two of the extending portions extend in a direction spreading leftward and rightward toward the crown side and the sole side.   The thin wall area defined by the thick portion formed in the central position portion and a plurality of extension portions extending from the thick portion to the crown side and the sole side has a uniform thickness on the peripheral side. The golf club according to claim 1, wherein:   In the thin part formed by the thick part formed in the central position part and a plurality of extension parts extending from the thick part to the crown side and the sole side, the auxiliary is thinner than the thick part of the thick part. The golf club according to claim 1, wherein a thick portion is formed.   The auxiliary thick part is formed in both thin areas on the toe side and the heel side in the divided thin area, and / or formed so as to surround the thick part of the central position portion. The golf club according to claim 4, characterized in that:   The auxiliary thick wall portion formed in both of the partitioned toe side and heel side thin area is formed such that the center position is closer to the face center than the center of the thin area. Item 6. A golf club according to Item 5.   The said auxiliary | assistant thick part has a rib-like thick part connected with the thick part formed in the said center position part, and / or the extension part, The Claim 1 characterized by the above-mentioned. The listed golf club.   8. The golf club according to claim 1, wherein an end portion of the extension portion is terminated at a position that does not reach an edge of a back surface of the face portion.   The tip of the extension part is located in a range of ± 10 mm with respect to a line obtained by drawing a perpendicular line at a position of 25 mm in the left-right direction from the center position. The golf club described in the item.

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