JP6454475B2 - Golf club head - Google Patents

Description

  The present invention relates to a golf club head and a golf club, and more particularly to a golf club head and a golf club having a high coefficient of restitution.

  In golf club heads, it has been conventionally practiced to reduce the thickness of a face portion having a ball striking surface (for example, about 3.0 mm or less). By making the face portion thin, the face portion is easily bent at the time of hitting. As a result, the coefficient of restitution is improved and the flight distance is increased.

  However, when the face portion is made thin, in general, the hitting sound tends to be loud and difficult to attenuate. This may adversely affect the hit feeling of the golfer. For this reason, as a hitting sound attenuation means, a technique of providing a resin plate on the back side of the face portion is known.

  Japanese Patent Application Laid-Open No. 2005-137634 describes a golf club head and a golf club in which a resin plate having a predetermined thickness is attached to the back surface of a hitting portion of a face portion having a predetermined thickness. Further, it is described that by providing a groove on the resin plate, the resin plate can easily follow the deflection of the face portion at the time of hitting, and the peeling of the resin plate due to repeated hitting can be suppressed.

JP 2005-137634 A

  In recent years, golf club heads having a higher coefficient of restitution (COR) than conventional ones have been realized due to improvements in materials and design techniques. Such a golf club head also has a high hitting sound. Therefore, in order to reduce the hitting sound and reduce the influence on the golfer's hit feeling, it is necessary to provide a resin plate larger than before and increase the vibration loss coefficient of the hitting sound.

  However, increasing the resin plate increases the mass of the resin plate, which affects the design of the center of gravity of the golf club head. Further, when the resin plate is simply enlarged to increase the rigidity of the resin plate, abnormalities such as peeling and cracking of the resin plate are likely to occur on the adhesive surface between the face portion of the highly repulsive golf club head and the resin plate.

  The present invention has been made to solve the above-described problems. A main object of the present invention is to provide a golf club head and a golf club which can easily attenuate the hitting sound and can suppress the occurrence of abnormality of the resin plate even when hitting repeatedly.

  A golf club head according to the present invention includes a face portion having a ball striking surface, and a plate member connected to the face portion on the back side of the ball striking surface of the face portion, and the plate member is a thin-walled portion having a small thickness And a thick part having a thickness greater than that of the thin part, and a groove part having a thickness smaller than that of the thick part is formed in the thick part.

  According to the present invention, it is possible to provide a golf club head and a golf club which can easily attenuate the hitting sound and can suppress the occurrence of abnormality of the resin plate even when hitting repeatedly.

It is a figure for demonstrating the golf club head which concerns on this Embodiment. It is sectional drawing in line segment II-II in FIG. It is a figure for demonstrating the plate member of the golf club head which concerns on this Embodiment. It is sectional drawing in line segment IV-IV in FIG. It is the side view seen from the arrow V in FIG. It is a figure for demonstrating the modification of the plate member of the golf club head which concerns on this Embodiment.

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

  1 to 5, golf club head 1 according to the present embodiment is fixed to the tip of shaft 20 to constitute a golf club. The golf club head 1 includes a face portion 2 and a plate member 3 that is located on the back side of the face portion 2 and connected to the face portion 2.

  The face portion 2 has a ball striking surface (hereinafter referred to as a face surface) 2A. The face surface 2A is scheduled to hit mainly, and has a region (so-called sweet spot SS) having a high coefficient of restitution (COR) near the center. The restitution coefficient of the face surface 2A at the sweet spot SS is, for example, 0.80 or more, and may be 0.82 or more.

Here, the coefficient of restitution of the golf club head 1 is calculated by the following method, for example. Specifically, a golf ball (mass: m) is caused to collide with a stationary golf club head (mass: M), and the incident velocity of the ball (the velocity of the ball before the collision with the face surface) V _IN and the reflection velocity ( Velocity of the ball after collision with the face surface) V _OUT is measured and calculated from the following formula (1).

V _OUT / V _IN = (eM−m) / (M + m) (1)
As the golf ball, for example, a pinnacle gold LS sold by ACUSHNET COMPANY is stored in a room at about 23 ° C., and the collision speed is, for example, 40.5 m / s. In addition, when the golf ball collides with the face surface, the club head is fixed so that the ball collides from the normal direction of the face surface so as to realize rebound to the front. The measurement is repeated 7 times, and the calculation is performed by averaging 5 times by cutting the upper and lower values.

  When the golf club is held, the face surface 2A extends from the sole portion 5 located at the end portion in contact with the ground contact surface to the top edge portion 6 located at the upper end portion in the vertical direction. The sweet spot SS is an intersection point between the face surface 2A and a line perpendicular to the face surface 2A from the center of gravity of the golf club head 1. The striking position HP is on the score line center in the toe heel direction, and is located 15 mm above the reading surface (the end located on the sole portion 5 side of the face surface 2A) along the face surface 2A. It is defined as a circle with a radius of 10 mm centered on a point.

  The face surface 2A is constituted by, for example, one plane. The face back surface 2B located on the back side of the face surface 2A is provided in parallel with the face surface 2A from the heel portion 1h to the toe portion 1t. That is, in the area where the face back surface 2B is formed, the thickness of the face portion 2 is the thickness from the face surface 2A to the face back surface 2B and is provided uniformly.

  A cavity portion 4 is formed behind the face back surface 2B when viewed from the face surface 2A side. The cavity portion 4 is formed so as to be continuous with the sole portion 5 side and the top edge portion 6 side of the face portion 2. Within the cavity portion 4, the plate member 3 is connected to the face portion 2.

  The plate member 3 has a first surface 3A provided in a planar shape, and is connected to the face portion 2 by bonding the first surface 3A and the face back surface 2B. The first surface 3A and the face back surface 2B may be connected using, for example, a double-sided tape 7. Preferably, the first surface 3A and the face back surface 2B are bonded using an adhesive (not shown) in addition to the double-sided tape 7. Note that both the face back surface 2B and the first surface 3A of the plate member 3 are not limited to the planar shape described above, and may have shapes that are uneven.

  The planar shape and dimensions of the plate member 3 are provided so that at least the plate member 3 overlaps the hit position HP of the golf club head 1 when viewed from the face surface 2A side. The planar shape and dimensions of the plate member 3 are preferably such that the direction from the heel portion 1h to the toe portion 1t is longer than the length from the sole portion 5 to the top edge portion 6 (hereinafter referred to as the short direction of the plate member 3). Hereinafter, the plate member 3 has a horizontally long shape (referred to as a longitudinal direction). The specific planar shape of the plate member 3 may be an arbitrary shape such as a circular shape, an elliptical shape, a polygonal shape, or a combination of these.

  The plate member 3 further has a second surface 3B that is located on the opposite side of the first surface 3A and includes a curved portion. In other words, the thickness between the first surface 3A and the second surface 3B of the plate member 3 is not uniform, and the plate member 3 is thicker than the thin portion 31 and the thin portion 31 that are relatively thin. Part 32. Furthermore, the thickness of the thick portion 32 is not uniform. The thin portion 31 and the thick portion 32 are provided integrally, and the thickness of the thick portion 32 located on the thick portion 32 side from the boundary between the thin portion 31 and the thick portion 32 is the thickness of the thin portion 31. In contrast, the thickness of the plate member 3 is gradually increased toward the center. That is, the thickness of the thick part 32 has a distribution in a range that exceeds the thickness of the thin part 31.

  The thickness W1 (see FIG. 4) of the thin portion 31 is, for example, not less than 0.6 mm and not more than 1.4 mm, and preferably not less than 0.8 mm and not more than 1.2 mm. On the other hand, the thickness W2 (see FIG. 4) of the thick portion 32 is, for example, not less than 3.8 mm and not more than 4.6 mm, and preferably not less than 4.0 mm and not more than 4.4 mm.

  In the plate member 3, the thick portion 32 is provided so that at least a portion thereof overlaps with the hit position HP of the golf club head 1 when viewed from the face surface 2 </ b> A side in the plate member 3. Specifically, in the short direction of the plate member 3, the thick portion 32 is provided closer to the sole portion 5 side of the golf club head 1 than the thin portion 31, and preferably on the sole portion 5 side of the plate member 3. Facing the edge. Further, in the longitudinal direction of the plate member 3, the thick portion 32 is formed over a region wider than the short direction of the plate member 3, for example, from the end of the heel portion 1 h of the plate member 3 to the toe portion 1 t side. It may be formed over the end of the.

  At this time, the width of the thick portion 32 in the short direction of the plate member 3 is preferably provided so as to be different in the longitudinal direction of the plate member 3. Specifically, the width of the thick portion 32 is longest in the region of the hitting position HP, and from there to the heel portion 1h side end portion and the toe portion 1t side end portion in the longitudinal direction of the plate member 3. It is preferable that it is provided so as to gradually become shorter.

  The main material constituting the plate member 3 may be any material that can attenuate the vibration of the face portion 2 at the time of hitting the ball (increase the loss factor of vibration). For example, ABS (acrylonitrile butylene styrene). Resin or epoxy resin. Referring to FIG. 4, plate member 3 has a structure in which, for example, plating layer 10 having a predetermined thickness is formed on the surface of resin portion 9 having a different thickness. The thick part 32 of the plate member 3 is provided with a thicker ABS resin than the thin part 31. The material constituting the plating layer 10 may be any plating material, for example, nickel-chromium (NiCr). As long as the plated layer 10 is formed on the second surface 3B, the plated layer 10 may be provided on the first surface 3A or may not be formed on the first surface 3A. By forming the plating layer 10 on the first surface 3A, the bonding strength between the face back surface 2B and the first surface 3A can be increased. Further, when the plating layer 10 is not formed on the first surface 3A, the manufacturing cost can be kept low.

  In the thick part 32, the groove part 8 is formed in the second surface 3B. The groove 8 has a bottom on the first surface 3A side. That is, the thickness of the thick portion 32 in the groove portion 8 is reduced by the first surface 3A and the second surface 3B. In the groove portion 8, the thickness W3 (see FIG. 4) formed by the first surface 3A and the second surface 3B is 0.6 mm or more and 1.4 mm or less, preferably 0.8 mm or more and 1.2 mm or less. That is, the thickness W3 of the plate member 3 in the groove portion 8 is substantially the same as the thickness W1 of the thin portion 31. In addition, the bottom part in the groove part 8 is also comprised by the resin part 9 and the plating layer 10. FIG.

  The groove portion 8 is provided so as to reach the end portion of the plate member 3 on the sole portion 5 side from the region of the hit position HP of the golf club head 1 when viewed from the face surface 2A side of the plate member 3. Further, the groove 8 does not reach the boundary between the thin portion 31 and the thick portion 32 on the top edge portion 6 side.

  The width of the groove 8 in the direction from the heel 1h to the toe 1t is narrower than the width of the sweet spot SS, and is, for example, 2.4 mm or less at a position 5 mm below the top of the groove 8. The width of the groove 8 may be provided so as to gradually expand from the region overlapping the sweet spot SS when viewed from the face surface 2A side to the sole portion 5 side.

  With reference to FIG. 5, it is preferable that the boundary part of the side wall of the groove part 8 and the 2nd surface 3B is chamfered. By doing so, it is possible to suppress the occurrence of cracks or the like in the plating layer 10 formed on the second surface 3B when the deflection of the face portion 2 is received.

  A golf club including the golf club head 1 according to the present embodiment can attenuate the hitting sound more effectively than a conventional golf club.

  Next, functions and effects of the golf club head 1 according to the present embodiment will be described. In the golf club head 1, the plate member 3 includes a thin portion 31 that is relatively thin and a thick portion 32 that is thicker than the thin portion 31. Thereby, the vibration generated in the face portion 2 at the time of hitting is damped by the plate member 3 having the thick portion 32. As a result, the hitting sound can be reduced and shortened. In particular, in the golf club head 1 having a high coefficient of restitution, since the amplitude of the face portion 2 at the time of hitting is increased, the hitting sound is increased and the vibration is continued for a long time, which can be effectively suppressed.

  Further, in the thick portion 32, the groove portion 8 is formed on the surface (second surface 3B) opposite to the side (first surface 3A) connected to the face portion 2 in the plate member 3. Accordingly, the groove portion 8 is easily deformed in the groove portion 8 because the plate member 3 is thin. As a result, the plate member 3 can easily follow the deflection of the face portion 2 at the time of hitting, so that the plate member 3 can be prevented from peeling from the face back surface 2B even when hit repeatedly.

  Further, in the plate member 3, the groove portion 8 has a bottom portion on the first surface 3 </ b> A side (side connected to the face portion 2). In other words, since the first surface 3A is provided as a single plane over the entire plate member 3, the plate member 3 can have a wide area connected to the face back surface 2B. As a result, since the connection strength between the face portion 2 and the plate member 3 can be increased, the golf club head 1 has a particularly high rebound coefficient and a large amplitude (displacement amount) of the face portion 2 at the time of hitting. However, it is possible to prevent the plate member 3 from being peeled from the face portion 2 due to the displacement.

  In the plate member 3, the thick portion 32 is provided on the sole portion 5 side with respect to the thin portion 31. In this case, since the thin portion 31 and the thick portion 32 are made of the same material, the difference in thickness becomes a difference in mass, and the position of the center of gravity of the plate member 3 is more sole than the center portion of the plate member 3. It can arrange | position to the part 5 side. As a result, the center of gravity position of the golf club head 1 can be lowered to the sole portion 5 side.

  Further, the groove portion 8 is provided so as to reach from the region overlapping the sweet spot SS of the golf club head 1 to the end portion of the plate member 3 on the sole portion 5 side when viewed from the face surface 2A side. In this way, the bending rigidity of the cross-section in the longitudinal direction of the plate member 3 which is the direction intersecting the direction in which the groove 8 extends is more effectively reduced. It becomes easy to follow the deflection of the. As a result, it is possible to prevent the plate member 3 from being peeled off from the face back surface 2B even when hit repeatedly.

  Further, the plate member 3 is formed with a thick portion 32 so that the width in the direction from the heel portion 1h to the toe portion 1t is wider than the width in the direction from the top edge portion 6 to the sole portion 5. . Therefore, it is possible to more effectively attenuate the vibration of the face portion 2 that occurs widely in the direction at the time of hitting. Further, the thick portion 32 is provided with a shorter width in the short direction of the plate member 3 in a region away from the striking position HP than in the region of the striking position HP. Furthermore, the thickness of the thick part 32 decreases along the direction from the vicinity of the center to the heel part 1h and the direction from the vicinity of the center to the toe part 1t. Therefore, the end portion in the longitudinal direction of the plate member 3 is easily deformed according to the deflection of the face portion 2, and the plate member 3 easily follows the deflection of the face portion 2 at the time of hitting. As a result, it is possible to prevent the plate member 3 from being peeled off from the face back surface 2B even when hit repeatedly.

  The plate member 3 is fixed to the face portion 2 via a double-sided tape 7 and an adhesive. The first surface 3A of the plate member 3 may be formed with minute irregularities due to voids or the like formed on the resin surface. Even in such a case, since the minute unevenness can be flattened by the adhesive, the first surface 3A and the double-sided tape 7 can be bonded directly or via an adhesive. Therefore, the entire first surface 3A can be used as a bonding area with the face portion 2, and the face portion 2 and the plate member 3 can be bonded more firmly.

  In the golf club head 1 according to the present embodiment, one groove portion 8 is formed in the plate member 3, but a plurality of (for example, two) groove portions 8 may be formed with reference to FIG. Good. Also in this case, it is preferable that each groove portion 8 is provided in the thick portion 32 so as to reach the end portion on the sole portion 5 side from the region overlapping with the striking position HP when viewed from the face surface 2A side. Even in this case, since the bending rigidity of the longitudinal section of the plate member 3 can be reduced, the plate member 3 can easily follow the deflection of the face portion 2 at the time of hitting. As a result, it is possible to prevent the plate member 3 from being peeled off from the face back surface 2B even when hit repeatedly.

  In the golf club head 1 according to the present embodiment, the thickness W3 of the plate member 3 in the groove 8 may be provided thinner than the thickness W1 of the thin portion 31. Even in this case, since the first surface 3A of the plate member 3 is widely provided, it is possible to increase the bonding area with the face back surface 2B and to easily follow the deflection of the face portion 2. it can.

  In the golf club head 1 according to the present embodiment, the groove portion 8 has a bottom portion on the first surface 3A side, but is not limited thereto. For example, the groove 8 may be configured as a region where the plate member 3 is not formed from the second surface 3B to the first surface 3A side. In this case, since the bonding area between the first surface 3A and the face back surface 2B is reduced by the area of the groove 8, the bonding strength between the first surface 3A and the face back surface 2B is the same as that in the present embodiment described above. This is lower than that of the golf club head 1. Further, when there is no problem in the adhesive strength, stress concentrates in the vicinity of the end portion of the groove portion 8 on the top edge portion 6 side. Therefore, such a plate member 3 can be applied to a golf club head 1 having a coefficient of restitution of 0.8 or less. On the other hand, when applied to a golf club head 1 having a high coefficient of restitution exceeding 0.82, the above-described plate member 3 according to the present embodiment is suitable.

  Although the embodiment of the present invention has been described above, the above-described embodiment can be variously modified. The scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is particularly advantageously applied to golf club heads and golf clubs having a high coefficient of restitution.

  DESCRIPTION OF SYMBOLS 1 Golf club head, 1h heel part, 1t toe part, 2 face part, 2A face surface, 2B face back surface, 3 plate member, 3A 1st surface, 3B 2nd surface, 4 cavity part, 5 sole part, 6 top Edge part, 7 Double-sided tape, 8 Groove part, 9 Resin part, 10 Plating layer, 20 Shaft, 31 Thin part, 32 Thick part.

Claims (4)

A face portion having a ball striking surface;
A golf club head comprising a plate member located on the back side of the hitting surface of the face portion and connected to the face portion;
The plate member includes a thin portion having a relatively thin thickness, and a thick portion having a thickness larger than the thin portion,
In the thick part, a groove is formed on the surface of the plate member opposite to the side connected to the face part,
In the plate member, the groove portion has a bottom portion on a side connected to the face portion,
In the plate member, the thick portion is provided closer to the sole portion than the thin portion,
The groove portion is provided so as to reach an end portion of the plate member on the sole portion side from a region overlapping the hit position of the golf club head when viewed from the striking surface side in the plate member. . A face portion having a ball striking surface;
A plate member located on the back side of the hitting surface in the face portion and connected to the face portion;
The plate member includes a thin portion having a relatively thin thickness, and a thick portion having a thickness larger than the thin portion,
In the thick part, a groove is formed on the surface of the plate member opposite to the side connected to the face part,
The thickness of the thick part decreases along the direction from the vicinity of the center to the heel part and the direction from the vicinity of the center to the toe part,
The groove portion is a golf club head provided along a direction from a sole portion to a top edge portion. A face portion having a ball striking surface;
A golf club head comprising a plate member located on the back side of the hitting surface of the face portion and connected to the face portion;
The plate member includes a thin portion having a relatively thin thickness and a thick portion having a thickness larger than the thin portion, and a short direction along a direction from the sole portion to the top edge portion, and a heel portion. A longitudinal direction along the direction leading to the toe,
In the thick part, a groove is formed on the surface of the plate member opposite to the side connected to the face part,
The width of the thick portion in the short direction is the longest in the area of the golf club head hitting position, and the heel side end of the plate member in the longitudinal direction from the hitting position area and It is provided so as to gradually shorten until the toe side end of the plate member,
The groove portion is a golf club head provided along the short direction. Said plate member, said that the face portion is fixed through a double-sided tape and adhesive, the golf club head according to any one of claims 1 to 3.

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