JP6502886B2 - Wood type golf club - Google Patents

Description

  The present invention relates to a wood-type golf club, and more particularly to a wood-type golf club having a sole structure.

  Conventionally, as disclosed in, for example, Patent Literatures 1 and 2, it is known to form a groove along the toe-heel direction on the face side of the sole portion of a wood-type golf club head. Thus, by forming the groove on the face side, the face portion is bent in a so-called bellows shape at the time of hitting a ball, and it is possible to improve the repulsive force and to improve the flight distance.

JP 2002-52099 JP 2003-93554 A

  As described above, by forming the groove in the sole portion, it is possible to increase the repulsive force of the face portion at the time of hitting, but there is still room for improvement with regard to the repulsion of the face portion at the time of hitting. That is, by making the face portion more flexible, it is possible to increase the resilience against the ball, and it is possible to transmit energy to the ball efficiently by eliminating energy loss as much as possible when hitting a ball.

  The sole portion of the above-described conventional head is flush with the ground plane on the face side and the back side of the groove, so that the face portion tends to bend back when hitting the ball. The sole portion on the back side of the groove comes into contact with the groove, which hinders flexibility. Also, as the contact center of the face moves largely at the time of hitting, as will be described later, the amount of spin (backspin amount) given to the ball at the time of hitting becomes large, thereby raising the ball and stopping the flight distance. . Furthermore, in the conventional groove configuration, when the groove width is increased, the flexibility of the face is improved and the resilience is improved, but by bending the lower end side of the face, the launch angle of the ball is reduced and the intended trajectory is achieved. Also, there is a problem of insufficient strength due to excessive deflection.

  The present invention provides, in a golf club having a groove in the sole portion, the flexibility of the face portion at the time of hitting a ball and improving the flight distance without causing insufficient strength.

  In order to solve the above-mentioned problems, a wood type golf club according to the present invention comprises a face portion, a sole portion and a crown portion, and a head having a groove formed along the toe-heel direction in the sole portion. In the rear wall defining the groove, the front wall, the height H1 of the rear wall <the height H2 of the front wall, and the sole portion is the rear wall and the front wall defining the groove in the relationship described above In order to move from the lower end of the rear wall to the back side, there is an inclined portion, and a straight line along the inclination direction of the inclined portion and 15 mm from the leading edge of the face surface of the face portion The crossing angle α with the tangent of the face surface at the height position is set to about 90 ° or less.

  According to the head having the above-described structure, the groove formed in the sole portion along the toe-heel direction causes the face portion to be bent at the time of hitting a ball, making it possible to enhance the resilience at the time of hitting a ball. In this case, the sole portion is formed with a sloped portion so as to move downward toward the back side from the lower end of the rear wall defining the groove to the sole portion, and the presence of the sloped portion makes the groove width Even if the width is not wide, the lower end side of the face portion can be easily bent to improve the resilience at the time of hitting a ball.

  Also, the inclined portion is formed so that the crossing angle α between the straight line along the inclination direction of the inclined portion and the tangent of the face surface at a height position of 15 mm from the leading edge of the face surface of the face portion is approximately 90 ° or less As a result, the groove portion is easily bent upward, and the deflection of the upper side enables the face portion to be displaced upward. Then, by displacing the face portion upward, it is possible to reduce the amount of spin imparted to the ball at the time of hitting a ball, thereby reducing the amount of backspin and suppressing the reduction of the ball flight distance. be able to. That is, by the above-mentioned inclined portion, the groove portion can be easily bent backward and upward without expanding the groove width, thereby improving the resilience at the hitting position and reducing the spin amount, The flight distance can be improved.

  According to the wood type golf club of the present invention, in the golf club having the groove in the sole portion, the flexibility of the face portion at the time of hitting is improved, and the flight distance can be improved without causing the insufficient strength. .

Sectional drawing which looked at the head of the wood type golf club which concerns on this invention from the side. FIG. 10 is a cross-sectional view of the head of a conventional wood-type golf club with the same loft angle as FIG. 1 and in which no inclined portion is formed on the back side of the groove, as viewed from the side. FIG. 3 schematically shows a displacement state of a face portion of the head shown in FIG. 2. FIG. 2 is a view schematically showing a displacement state of a face portion of the head shown in FIG. 1. The head shown in FIG. 1 WHEREIN: The enlarged view of the groove part formed in the sole part.

  1 and 5 are views showing the head portion (hollow head) of a wood type golf club according to the present invention, and FIG. 1 is a cross sectional view seen from the side, and FIG. 5 is an enlarged view of a groove formed in a sole portion. FIG. In addition, since the golf club of the present invention is characterized in the head portion, the characteristic portion of the head will be described below.

As is generally known, the head main body 1 constituting the head has a structure in which a plurality of outer shells formed by casting, forging or the like are integrated by welding, adhesion or the like.
The head main body 1 of the present embodiment extends from the lower edge of the face portion 2 to the face portion 2 having the striking face (face surface) 2 a, the crown portion 3 extending backward from the upper edge of the face portion 2 It has a sole portion 5 that comes out and a back portion 7 that faces the face portion 2, and further includes a toe portion and a heel portion passing through the back portion 7 from the face portion 2, although not explicitly shown in the drawing. In addition, since a back part, a toe part, and a heel part connect the edge of the said crown part 3 and the sole part 5, they are also called a side part.

  The head main body 1 is configured by joining a plurality of outer shell members by welding, adhesion or the like, and each outer shell member is formed by, for example, casting a titanium alloy, an aluminum-based alloy, a magnesium alloy, etc. Thus, the head main body 1 can be constructed by integrally forming the respective edge regions by welding or the like. In the outer shell member, a plurality of members or partial components of the respective members are integrally formed by casting or the like such as integrating the side portion and the sole portion or integrating the crown portion and the side portion. They may be fixed by welding, adhesion or the like. For this reason, the boundary of each part may not necessarily be clearly divided by a ridgeline, and may be configured by a curved surface that continuously connects each part.

  The face portion 2 is integrally formed by, for example, pressing titanium, a titanium alloy or the like by press processing, NC processing (including CNC processing), or forging, etc. It is possible to join to other shell members by welding, brazing, adhesion and the like. The face portion 2 can be formed in a plate shape or a cup shape and joined to the crown portion 3, the sole portion 5 and the front end opening edge of the side portion. In this case, when the face portion is formed in a cup shape, a part of the member constitutes a crown part, a side part, and a part of a sole part.

  Further, in the crown portion 3 of the head main body 1, a hosel portion 10 for fixing a tip of a shaft (not shown) is integrally formed. The hosel portion 10 is provided so as to project upward from the face and heel side of the crown portion 3, and the tip end portion of a metal or fiber reinforced resin shaft is fitted and fixed in the opening hole thereof. This constitutes a golf club.

  In the sole portion 5 described above, a groove 5A is formed on the face portion side along the toe-heel direction. The groove 5A is defined by an inner wall on the back side (hereinafter referred to as the back wall 5a) and an inner wall on the face side (hereinafter referred to as the front wall 5b), and the top (bottom of the groove) is the present embodiment. In the form, they are connected by a U-shaped curved surface. The rear wall 5a and the front wall 5b defining the groove 5A are formed such that the height H1 of the rear wall is smaller than the height H2 of the front wall, where H1 and H2 respectively represent the heights of the rear wall 5a and the front wall 5b. For this reason, the sole portion 3 moves from the lower end of the rear wall (the inflection point where the groove changes to the sole portion) P1 to the back side so that the rear wall 5a and the front wall 5b defining the groove 5A have the above relationship. The inclined portion 5d is formed to descend as it moves. That is, the back wall 5a and the front wall 5b defining the groove 5A have the height of the back wall by forming the inclined portion 5d inclined along the face-back direction on the back side of the groove 5A of the sole portion 5 H1 <height of front wall H2.

  Here, regarding the heights H1 and H2 of the rear wall 5a and the front wall 5b, assuming that the top of the upper end position (the deepest part of the groove) on the crown side is P2, the height P1 of the top P2 and the lower end P1 of the rear wall The height in the vertical direction (vertical direction with respect to the ground contact surface P) is the height H1 of the back wall 5a, the height in the vertical direction of the top P2 and the lower end of the front wall (inflection point changing from groove to sole) P3 is front It is defined as the height H2 of the wall 5a.

  According to the present invention, by forming the inclined portion 5d in the sole portion 5, the flexibility of the face portion utilizing the groove is further improved, and the face portion is vertically displaced to enhance the resilience at the hitting position. At the same time, it is characterized in that the amount of backspin given to the ball is reduced, and the inclination angle of the inclined portion 5d formed on the sole portion becomes important. That is, if the inclination of the inclined portion is too loose, the face portion 2 will be in a stuck state when flexed at the time of hitting a ball, and deflection on the back side of the lower end position of the face portion will be restricted. For this reason, the lower end position of the face portion can be easily bent to the back side by making the inclination of the inclined portion steep to some extent. However, if the inclination is made too steep, the face portion is hardly displaced in the vertical direction, and the efficiency of energy transfer to the ball is lowered (this principle will be described later).

  Regarding the inclination angle of the inclined portion 5d described above, the straight line L1 along the inclination direction of the inclined portion and the leading edge of the face surface 2a of the face portion 2 (the foremost line of the face surface at the boundary between the face surface and the sole The crossing angle α with the tangent L2 of the face surface at a height position P5 from LE to H (15 mm) is set to be approximately 90 ° or less (about ± 1 to 2 ° is acceptable).

  As described above, when the crossing angle α between the two lines becomes approximately 90 ° or less, it becomes difficult to receive the restriction by the extension direction of the inclined portion 5d (the restriction such as holding against deflection), and the lower end 2b of the face 2 But it is easy to bend in the arrow A direction. In this case, when the crossing angle α becomes too small, as described later, the groove 5A is hardly bent upward as shown by the arrow B, and this leads to energy loss at the time of hitting a ball. Specifically, it is set to be in the range of 90 ° to 75 °, preferably in the range of 90 ° to 80 °.

  The tangent line L2 of the face surface is at the height position P5 of H (15 mm) from the leading edge LE on the face surface 2a described above in the wood type golf club, the hitting point at which a hit is actually made is: Because it is near the position of P5. The straight line L1 specifying the inclined state of the inclined portion 5d is a line along the plane if the lower surface (front surface) of the inclined portion 5d is flat, and the curved surface or the compound surface is described above. It is defined by a line connecting the lower end P1 of the rear wall and the inflection point P6 at which the lower end of the inclined portion 5d changes to the sole portion 5.

  Here, as described above, the inclined portion 5d formed on the back side of the groove 5A and the principle of reducing the resilience and the spin amount of the hitting ball will be described with reference to FIGS. 2 to 4. FIG. In these drawings, FIG. 2 is a drawing to be compared with FIG. 1, and the head of a conventional wood-type golf club having the same loft angle as FIG. 1 and having no sloped portion on the back side of the groove. FIG. 3 is a cross-sectional view seen from the side (the same reference numerals are given to the same components as FIG. 1), FIG. 3 is a view schematically showing a displacement state of a face portion of the head shown in FIG. It is a figure which shows typically the displacement state of the face part of the head of the wood type | mold golf club based on this invention shown to.

In FIG. 1 and FIG. 2, when hitting at the face portion, the situation where the face portion bends and the situation where the sole portion is displaced are shown by dotted lines (in FIG. 1 to FIG. (Deformed).
In the shape of the groove 5A shown in FIG. 2, as in the present invention, the slope portion is not formed in the sole portion 5, and the height of the rear wall 5a defining the groove 5A and the front wall 5b is the same. It is formed. Therefore, with such a structure, the deflection of the lower end 2b of the face portion 2 is restricted at the time of hitting a ball, so that the face portion does not bend sufficiently and the resilience becomes weak compared to the structure of the present invention. There is. Further, in such a structure, as shown in FIG. 5, the groove 5A itself is difficult to displace in the vertical direction, so the face portion does not displace upward along the face surface at the time of hitting a ball, and It is a factor that gives spin.

This will be described with reference to the schematic diagrams of FIGS. 3 and 4.
As shown in FIG. 3, a position (contact center) at which the face surface 2a of the face portion 2 contacts the ball at the time of hitting is indicated by P5. As described above, the contact center with the face surface 2a is about 15 mm in height from the leading edge LE (defined by the foremost line of the face surface at the boundary between the face surface and the sole portion). The height position is shown as a distance H from the leading edge LE as P5.

  As described above, at the time of hitting a ball, the lower end of the face portion 2 is bent by the groove 5A formed in the sole portion 5, and the face portion is displaced to a position indicated by a dashed dotted line (displaced face portion is indicated by reference numeral 2 ' ). The contact center P5 'of the ball in the face portion 2' moves upward due to the bending of the face portion. As schematically shown, the contact center P5 'is (H + Y1) from the lower end of the face portion, and before and after the face portion bends, the contact center to the ball moves upward by a distance Y1. The upward movement of the contact center (Y1) acts to apply rotation to the ball. That is, the spin amount is added to the ball by the movement amount Y1.

FIG. 4 is a schematic view in the case where the inclined portion is formed in the sole portion as described above.
As shown in FIG. 5, the lower end 2b of the face portion is formed by forming the inclined portion 5d such that the height H1 of the rear wall 5a defining the groove 5A is lower than the height H2 of the front wall 5b. Is easy to bend in the A direction. In FIG. 4, the face portion 2 ′ indicated by an alternate long and short dash line shows the state of FIG. 3, and the face portion 2 ′ ′ indicated by an alternate long and two short dashes line is on the back side as compared with the configuration shown in FIG. The state of being displaced to the back side more than the face portion 2 'of the alternate long and short dash line is shown because it is easy to bend.

  Further, in addition to the flexibility of the lower end of the face portion 2 being improved by forming the inclined portion 5d in the sole portion, the starting point position of the rising of the inclined portion 5d (around the position P6 shown in FIG. 5) As a result, the groove 5A itself is easily displaced upward (direction B). That is, with the displacement of the groove 5A, the face portion 2 itself is also displaced upward (the B 'direction) along the face surface direction.

As described above, the face portion 2 ′ ′ indicated by the two-dot chain line in FIG. 4 is further displaced upward, in addition to the state displaced further to the back side than the face portion 2 ′ in FIG.
As described above, when hitting the ball, the position (contact center) at which the face surface 2a contacts the ball is P5, and the face portion is displaced to the back side more than the face portion 2 'in FIG. The contact center of the ball is the P5 ′ ′ position of the face portion indicated by a two-dot chain line. Since the face portion is displaced upward, the contact center P5 ′ ′ does not move above the face surface as shown in FIG. That is, the contact center P5 ′ ′ becomes (H + Y2) from the lower end of the face portion, and before and after the face portion bends, the contact center with the ball moves upward by the distance Y2. The distance Y2 is smaller than the distance Y1 at the face portion 2 'because the face portion is displaced upward, and Y2 <Y1.

  As described above, since the ball is rotated by the amount by which the contact center moves upward, as apparent from the comparison between the face portion 2 ′ and the face portion 2 ′ ′ (Y2 <Y1), the face portion is The amount of spin given to the ball is smaller when it is displaced upward than in the configuration shown in FIG. 3, and the ball is prevented from being blown up by an amount corresponding to the reduction, and the flight distance can be improved. Further, as shown in FIG. 4, since the face portion 2 ′ ′ is displaced to the back side more than the face portion 2 ′, the vector difference in the direction perpendicular to the ball at the contact center P5 ′ ′ (shown in FIG. The distance Lf) contributes to the repulsion of the ball as compared to the face portion 2 '.

  That is, as in the present invention, by forming the inclined portion 5d on the rear side of the groove 5A of the sole portion, the face portion is easily displaced to the back side and the upper side, thereby repelling the ball at the time of hitting As a result, the initial velocity of the ball is improved, and the backspin can be suppressed to improve the flight distance. Further, it is not necessary to widen the groove width to improve the flexibility of the face, and it is also possible to suppress the strength reduction.

  As described above, in the inclined portion 5d formed in the sole portion, the intersection of the straight line L1 along the inclination direction of the inclined portion and the tangent L2 of the face surface at the position P5 of the face surface 2a of the face portion 2 If it is formed so that the angle α is approximately 90 ° or less, it becomes difficult to receive the restriction by the extension direction of the inclined part 5d (the restriction to hold it against deflection), and the lower end 2b of the face part 2 in the arrow A direction. Although it becomes easy to bend, if the crossing angle α becomes too small, the groove 5A will not easily bend upward as shown by the arrow B, which will be a factor to increase the spin amount at the time of hitting. For this reason, it is preferable to form the intersection angle α within the range of 90 ° to 75 ° as described above so as to be easily bent in the arrow B direction.

  The thickness T of the inclined portion 5d is preferably smaller than the thickness t of the rear wall 5a and the front wall 5b defining the groove 5A. That is, since the thickness of the inclined portion 5d is reduced, the inclined portion itself is easily bent around the starting point position P6. As a result, the groove 5A is easily bent upward, and the face surface of the face portion is also displaced upward. It becomes easy to do. That is, the amount of spin given to the ball at the time of hitting is also reduced.

  Further, with respect to the inclined portion 5d, when the width L in the front-rear direction (a distance along the face-back direction and a distance between P1 and P6) L becomes short, the amount of upward deflection of the groove 5A decreases. At the same time, if the distance L becomes long, the face portion will not easily bend to the back side. Although depending on the size of the head main body, it is preferable that the width in the front-rear direction of the inclined portion 5d be in the range of 5 to 15 mm.

  As described above, the present invention is characterized by the inclined portion formed on the back side of the groove in the wood type golf club in which the groove is formed in the sole portion in order to improve the resilience against the ball, and the head There is no limitation on the size, shape, constituent materials and the like of Further, the depth and width of the groove 5A can be appropriately modified, and the groove 5A may not be continuously connected in the toe-heel direction.

Reference Signs List 1 head body 2 face portion 2a face surface 3 crown portion 5 sole portion 5A groove 5a back wall 5b front wall 5d sloped portion 10 shaft

Claims (4)

A wood type golf club having a head including a face portion, a sole portion, and a crown portion, and the sole portion having a groove formed along the toe-heel direction,
With respect to the rear wall and the front wall defining the groove, the height H1 of the rear wall <the height H2 of the front wall,
The sole portion has a sloped portion so that the rear wall and the front wall defining the groove move downward from the lower end of the rear wall to the back side, as described above.
An intersection angle α between a straight line along the inclination direction of the inclined portion and a tangent of the face surface at a height position of 15 mm from the leading edge of the face surface of the face portion is set to about 90 ° or less. Wood type golf club.   The wood type golf club according to claim 1, wherein the crossing angle is 90 ° to 75 °.   The wood type golf club according to claim 1 or 2, wherein a thickness of the inclined portion is formed thinner than a thickness of the rear wall and the front wall which define the groove portion.   The wood type golf club according to any one of claims 1 to 3, wherein a width L of the inclined portion in the front-rear direction is formed in a range of 5 to 15 mm.

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