JP5447914B2 - Wood type golf club head and wood type golf club - Google Patents

Description

  The present invention relates to a wood type golf club head and a wood type golf club. More specifically, the present invention relates to a wood type golf club head capable of both maintaining a sweet spot height low and ensuring a large moment of inertia. The present invention relates to a wood type golf club provided with a wood type golf club head.

In recent years, with wood-type golf club heads, as the head volume increases, the head moment of inertia increases, so that the flight distance loss is reduced in shots where a sweet spot (hereinafter referred to as SS) called off-center shot is removed. What has an effect has become mainstream (for example, refer nonpatent literature 1 and patent documents 1-2). On the other hand, a wood-type golf club head has also been proposed in which the center of gravity of the head is moved forward (the depth of gravity of the center of gravity is reduced) and the center of gravity is lowered (for example, see Patent Document 3).
“E500 DRIVER TECHNOLOGY”, [on line], Mizuno Corporation homepage, [October 20, 2008 search], Internet <URL: http: // www. golflands. net / jpx / driver / e500dr_tech. html> JP-A-7-284546 JP-A-2005-278800 Japanese Patent Laid-Open No. 11-319166

  However, if only the increase in the head inertia moment is pursued, SS increases. For this reason, when a golf club having such a head is used, the number of hitting points is lower than that of SS, resulting in a ball trajectory with a low trajectory and a large number of back spins, resulting in a problem that a sufficient flight distance cannot be obtained. In addition, if the moment of inertia in the toe heel direction (also called the moment of inertia in the left-right direction) is large, the distance from the center axis of the head shaft to the center of gravity of the head (the center of gravity distance) inevitably increases, and the moment of inertia around the shaft axis increases. . As a result, when a golf club equipped with such a head is used, there is also a problem that a so-called unobtainable ball is often obtained by a fade-type hit ball.

Explaining in more detail, as in the wood type golf club head disclosed in Non-Patent Document 1 (Mizuno Co., Ltd., February 2007 release model, JPX E500 Director), excess mass was concentrated on the rear part of the sole. In this case, the vertical moment of inertia (hereinafter referred to as the vertical moment of inertia) becomes large, but the depth of the center of gravity tends to be deep, and there is a demerit that SS becomes high. Specifically, in the wood type golf club head disclosed in Non-Patent Document 1, the longitudinal moment of inertia is 2830 g · cm ² which is sufficiently large, but the height of the SS from the ground (hereinafter referred to as the SS height). Is as high as 38.5 mm.

  In addition, the wood type golf club head disclosed in Patent Document 1 employs a configuration in which the thickness of the entire peripheral portion is increased as compared with the central portion of the sole portion. By adding mass to the toe side and heel side of the sole part, in this case, the wood type golf club head has a sole in the toe heel direction of the sole part to cope with various swings or lies. Since the roundness called round is added, the position of the center of gravity is high, and SS has to be high.

  Further, in the wood type golf club head disclosed in Patent Document 2, a configuration has been proposed in which the distance between the center of the face and SS is reduced to within 5% on the face surface while increasing the longitudinal moment of inertia. As a method for this, a method for designing the face surface to be positioned higher than the ground is disclosed (see FIGS. 2, 3, 7, and 8). However, when such a peculiar shape is adopted, since the SS height is actually high, the impact due to the hitting point at the lower part is higher than the SS. As a result, since the pop-out is low and the backspin is increased, it is difficult to exhibit the original flight distance performance of the head. In order to avoid this, it is necessary to hit with a high tee-up, but since it is forced to swing different from its own swing, it is actually difficult to hit. Further, as shown in FIG. 14, even when mass is added only to the rear end of the back side, the problem arises that the SS height becomes high as in Non-Patent Document 1 described above.

  On the other hand, in the wood type golf club head disclosed in Patent Document 3, the center of gravity of the head is obtained by adopting a structure in which a rod-shaped weight ranging from the toe portion to the heel portion is fixed on the inner surface of the sole surface close to the face surface. While moving forward (shallowing the depth of the center of gravity), the center of gravity is lowered. According to this structure, although SS height becomes low, the problem that a longitudinal moment of inertia becomes small arises.

  As described above, the conventional wood type golf club head has a problem that it is difficult to achieve both an increase in the moment of inertia and a reduction in the SS height. SUMMARY OF THE INVENTION An object of the present invention is to provide a wood type golf club head capable of both maintaining a low sweet spot height and ensuring a large longitudinal moment of inertia, and a wood type equipped with the wood type golf club head. It is to provide a golf club.

A wood type golf club head according to one aspect of the present invention is a wood type golf club head including a face portion having a ball striking surface, a sole portion connected to the face portion, and a hosel portion to be connected to a shaft. is there. In this wood type golf club head, the shaft center line projected on the reference plane in the projected image of the golf club head projected on the reference plane in a state where the sole portion is in contact with the reference plane at a specified lie angle. Parallel to the face side line segment that touches the face part projected on the reference plane, the back side line segment that touches the back side opposite to the face side line segment, and the shaft center line projected on the reference plane A rectangular area including a heel side line segment passing through the connection portion between the hosel part and the main body part projected on the reference plane and a toe side line segment contacting the toe side opposite to the heel side line segment is set, and the rectangular area Is divided into nine congruent element rectangular areas by two line segments parallel to the face side line segment and two line segments parallel to the heel side line segment, The mass of the sole portion corresponding to the face portion side central rectangular region located at the face portion side center as viewed from the rectangular region and the sole corresponding to the back side central rectangular region located at the back side center opposite to the face portion side Each of the masses of the parts is larger than the mass of the sole part corresponding to each of the seven element rectangular areas other than the face side central rectangular area and the back side central rectangular area. Further, the mass of the sole part corresponding to the face side central rectangular area and the mass of the sole part corresponding to the back side central rectangular area are respectively the toe side central rectangular area and the center located at the toe side center as viewed from the central rectangular area. The weight of the sole portion corresponding to each of the heel side central rectangular region and the central rectangular region located at the heel side center as viewed from the rectangular region is larger by 5 g or more and 50 g or less. The height of the sweet spot is 35.5 mm or more and 36.2 mm or less, and the moment of inertia is 2827 g · cm ² or more and 2887 g · cm ² or less.

A wood type golf club head according to another aspect of the present invention is a wood type golf club head including a face portion having a hitting surface, a sole portion connected to the face portion, and a hosel portion to be connected to a shaft. is there. In this wood type golf club head, the shaft center line projected on the reference plane in the projected image of the golf club head projected on the reference plane in a state where the sole portion is in contact with the reference plane at a specified lie angle. Parallel to the face side line segment that touches the face part projected on the reference plane, the back side line segment that touches the back side opposite to the face side line segment, and the shaft center line projected on the reference plane A rectangular area including a heel side line segment passing through the connection portion between the hosel part and the main body part projected on the reference plane and a toe side line segment contacting the toe side opposite to the heel side line segment is set, and the rectangular area Is divided into nine congruent element rectangular areas by two line segments parallel to the face side line segment and two line segments parallel to the heel side line segment, Corresponding to the maximum thickness of the sole part corresponding to the face side central rectangular area located in the center of the face part when viewed from the rectangular area and the back side central rectangular area located in the back side center opposite to the face part side Each of the maximum thicknesses of the sole portion is a toe side central rectangular region located at the center of the toe side as viewed from the central rectangular region, a heel side central rectangular region and a central rectangular region located at the heel side center as viewed from the central rectangular region It is larger than the maximum thickness of the sole portion corresponding to each of the above. Each of the mass of the sole portion corresponding to the face side central rectangular region and the mass of the sole portion corresponding to the back side central rectangular region is composed of seven element rectangular regions other than the face side central rectangular region and the back side central rectangular region. It is larger than the mass of the sole part corresponding to each. Further, the mass of the sole portion corresponding to the face side central rectangular region and the mass of the sole portion corresponding to the back side central rectangular region correspond to each of the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region. It is larger by 5 g or more and 50 g or less compared to the mass of the sole part to be performed. The height of the sweet spot is 35.5 mm or more and 36.2 mm or less, and the moment of inertia is 2827 g · cm ² or more and 2887 g · cm ² or less. In the specification, claims, and abstract, the maximum thickness of the sole portion refers to the maximum value of the thickness in a predetermined region of the sole portion.

Above preferably in wood type golf club head in another aspect, each of the maximum thickness of the sole portion corresponding to the maximum wall thickness and the back-side central rectangular area of the sole portion corresponding to the face portion side central rectangular area, It is 1.3 mm or more larger than the maximum thickness of the sole portion corresponding to each of the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region.

A wood type golf club head according to still another aspect of the present invention includes a face portion having a hitting surface, a sole portion connected to the face portion, and a hosel portion to be connected to a shaft. It is. In this wood type golf club head, the shaft center line projected on the reference plane in the projected image of the golf club head projected on the reference plane in a state where the sole portion is in contact with the reference plane at a specified lie angle. Parallel to the face side line segment that touches the face part projected on the reference plane, the back side line segment that touches the back side opposite to the face side line segment, and the shaft center line projected on the reference plane A rectangular area including a heel side line segment passing through the connection portion between the hosel part and the main body part projected on the reference plane and a toe side line segment contacting the toe side opposite to the heel side line segment is set, and the rectangular area Is divided into nine congruent element rectangular areas by two line segments parallel to the face side line segment and two line segments parallel to the heel side line segment, The maximum thickness of the sole portion corresponding to the face side central rectangular area located in the center on the face side as viewed from the rectangular area is the toe side central rectangular area and the central rectangular area located in the toe side as viewed from the central rectangular area. The heel side central rectangular region located at the heel side center and the sole wall thickness corresponding to each of the central rectangular regions are larger than the maximum thickness of the sole portion. Further, the sole portion corresponding to the back side central rectangular region located in the back side center opposite to the face portion side as viewed from the central rectangular region includes an appendage for adding mass to the sole portion. Yes. Each of the mass of the sole portion corresponding to the face side central rectangular region and the mass of the sole portion corresponding to the back side central rectangular region is composed of seven element rectangular regions other than the face side central rectangular region and the back side central rectangular region. It is larger than the mass of the sole part corresponding to each. Further, the mass of the sole portion corresponding to the face side central rectangular region and the mass of the sole portion corresponding to the back side central rectangular region correspond to each of the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region. It is larger by 5 g or more and 50 g or less compared to the mass of the sole part to be performed. The height of the sweet spot is 35.5 mm or more and 36.2 mm or less, and the moment of inertia is 2827 g · cm ² or more and 2887 g · cm ² or less.

  Preferably, in the wood type golf club head according to the other aspect described above, the maximum thickness of the sole portion corresponding to the face side central rectangular region is the toe side central rectangular region, the heel side central rectangular region, and the central rectangle. It is 1.3 mm or more larger than the maximum thickness of the sole portion corresponding to each region.

  In the wood type golf club head according to the still further aspect, preferably, the sole portion has a mass of 5 g or more and 50 g or less added by the accessory.

  In the wood type golf club head according to the present invention, preferably, the maximum thickness of the sole portion corresponding to each of the toe side central rectangular region, the heel side central rectangular region and the central rectangular region is 0.4 mm or more and less than 1.0 mm. is there.

  A wood type golf club according to the present invention includes the wood type golf club head of the present invention.

  In the wood type golf club head according to one aspect of the present invention, each of the mass of the sole portion corresponding to the face side central rectangular region and the mass of the sole portion corresponding to the back side central rectangular region is a toe side central rectangular region, It is set to be larger than the mass of the sole portion corresponding to each of the heel side central rectangular region and the central rectangular region. Therefore, according to the wood type golf club head in one aspect of the present invention, there is provided a wood type golf club head capable of both keeping the sweet spot height low and ensuring a large moment of inertia. be able to.

  Further, in the wood type golf club head according to another aspect of the present invention, each of the maximum thickness of the sole portion corresponding to the face side central rectangular region and the maximum thickness of the sole portion corresponding to the back side central rectangular region, It is set larger than the maximum thickness of the sole portion corresponding to each of the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region. Therefore, according to the wood type golf club head in another aspect of the present invention, as in the case of the wood type golf club head in the above aspect, the sweet spot height is kept low and a large moment of inertia is secured. A wood-type golf club head capable of achieving both can be provided.

  Further, in the wood type golf club head according to still another aspect of the present invention, the maximum thickness of the sole portion corresponding to the face side central rectangular region has a toe side central rectangular region, a heel side central rectangular region, and a central rectangular region. Is set larger than the maximum thickness of the sole portion corresponding to each of the above. Furthermore, in the wood type golf club head according to still another aspect of the present invention, the sole portion corresponding to the back side central rectangular region includes an appendage for adding mass to the sole portion. Therefore, according to the wood type golf club head in still another aspect of the present invention, as with the wood type golf club head in the above aspect, the sweet spot height is kept low and a large moment of inertia is secured. It is possible to provide a wood type golf club head capable of achieving both of the above.

  Moreover, the wood type golf club of the present invention includes the wood type golf club head as described above. Therefore, it is possible to provide a wood type golf club capable of achieving both improvement in flight distance and stabilization of flight distance.

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

(Embodiment 1)
Hereinafter, Embodiment 1 which is one embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing the configuration of the golf club in the first embodiment. FIG. 2 is a schematic plan view of the golf club head provided in the golf club of FIG. 1 as viewed from the crown portion side. FIG. 3 is a schematic plan view of the golf club head provided in the golf club of FIG. 1 as viewed from the face side. FIG. 4 is a schematic plan view of the golf club head provided in the golf club of FIG. 1 as seen from the sole side. FIG. 5 is a schematic plan view of the golf club head provided in the golf club shown in FIG. 1 as viewed from the toe side. FIG. 6 is a schematic view showing a state in which the golf club head included in the golf club of FIG. 1 is projected onto the reference plane and viewed from the sole portion side.

  Referring to FIG. 1, a golf club 9 as a wood type golf club in the present embodiment includes a head 1 as a wood type golf club head, a shaft 2 connected to a hosel portion 13 of the head 1, and a shaft 2. And a grip portion 3 disposed at the end opposite to the side connected to the head 1.

  2 to 5, the head 1 includes a face portion 11 having a ball striking face 11 </ b> A, a sole portion 14 connected to the face portion 11, and a face portion 11 that covers the upper surface of the sole portion 14. And the hosel part 13 to be connected to the shaft 2 (see FIG. 1). Then, referring to FIG. 5, the intersection of the perpendicular drawn from the center of gravity 22 of the head 1 to the face portion 11 and the surface of the face portion is SS21.

  Here, the mass distribution of the sole portion 14 in the present embodiment will be described. With reference to FIGS. 5 and 6, a projection image of the head 1 projected on the reference plane β in a state where the sole portion 14 is grounded to the reference plane β at a specified lie angle will be considered. At this time, the face part side line segment 81 that is parallel to the shaft center line α projected onto the reference plane β and touches the face part 11 projected onto the reference plane β, and the back side opposite to the face part side line segment 81 And a heel side line segment 83 passing through a connecting portion between the hosel part 13 and the main body part of the head 1 projected onto the reference plane β and orthogonal to the shaft center line α projected onto the reference plane β. A rectangular region including a heel side line segment 83 and a toe side line segment 84 in contact with the toe side opposite to the heel side line segment 83 is set. Further, the rectangular area is divided into nine congruent element rectangular areas by two line segments 85 and 86 parallel to the face side line segment 81 and two line segments 87 and 88 parallel to the heel side line segment 83. .

  At this time, in the sole portion 14 in the present embodiment, the sole corresponding to the face portion side central rectangular region 91 located in the center on the face portion 11 side when viewed from the central rectangular region 94 located in the center of the element rectangular regions. The mass of the portion 14 and the mass of the sole portion 14 corresponding to the back side central rectangular region 92 located at the back side center opposite to the face 11 side are centered on the toe side as viewed from the central rectangular region 94. The toe side central rectangular region 93, the heel side central rectangular region 95 positioned in the heel side center as viewed from the central rectangular region 94, and the mass of the sole portion 14 corresponding to each of the central rectangular regions 94 are larger.

  Next, effects produced by the head 1 and the golf club 9 in the present embodiment will be described. FIG. 7 is a schematic perspective view for explaining the moment of inertia in the wood type golf club head.

  The present inventor has conducted detailed studies on the configuration of a wood-type golf club head capable of both maintaining a sweet spot height, which has been difficult in the past, and ensuring a large moment of inertia. As a result, the following measures have been devised to arrive at the present invention.

  That is, with reference to FIG. 5, when adopting a configuration in which the mass on the back side (left side in FIG. 5) of the sole portion is increased as in the wood type golf club head disclosed in Non-Patent Document 1, the vertical moment of inertia is adopted. (Corresponding to “the moment of inertia around the center of gravity in the crown / sole direction” in FIG. 7) increases. However, referring to FIG. 5, since the center of gravity 22 moves to the back side, SS21 rises and the SS height increases. On the other hand, when a structure in which a rod-like weight ranging from the toe portion to the heel portion is fixed on the inner surface of the sole surface close to the face surface as in the wood type golf club head disclosed in Patent Document 3 above, the center of gravity 22 Moves to the face side (the right side in FIG. 5), so the SS height is lowered. However, contrary to the case of Non-Patent Document 1, the longitudinal moment of inertia is small. In addition, when adopting a configuration in which the thickness of the entire peripheral portion is increased as compared with the center portion of the sole portion as in the wood type golf club head disclosed in Patent Document 1, there are various types of wood type golf club heads. In order to cope with the swing or lie, the toe heel direction of the sole part is rounded called a sole round, so mass is also added to the toe side and heel side of the sole part, which is close to the center of gravity. The Therefore, the position of the center of gravity increases and the SS height increases. In other words, when the excess mass is concentrated on one part of the sole part or arranged in the entire peripheral part, it is possible to maintain the sweet spot height, which is the target of the present invention, and to ensure a large moment of inertia. Cannot be achieved.

  On the other hand, in the head 1 according to the present embodiment, the mass of the sole portion 14 corresponding to the toe side central rectangular region 93, the central rectangular region 94, and the heel side central rectangular region 95 that are close to the center of gravity is made as light as possible. On the other hand, a configuration is adopted in which the mass of the sole portion 14 corresponding to the face side central rectangular region 91 and the back side central rectangular region 92 is increased. Thereby, in the head 1 in the present embodiment, it is compatible to maintain the SS height low and to ensure a large longitudinal inertia moment.

  Of course, with respect to the face part 11 and the crown part 12 and the like, as long as the strength permits, the thickness is designed to be thin to increase the excess mass, and the sole corresponding to the face side central rectangular area 91 and the back side central rectangular area 92 is designed. Increasing the amount of mass added to the portion 14 increases the effect of the present invention. As for the sole portion 14, it is preferable to concentrate the mass on the sole portion 14 corresponding to the face side central rectangular region 91 and the back side central rectangular region 92. More specifically, the mass of the sole portion 14 corresponding to the face-side central rectangular region 91 and the mass of the sole portion 14 corresponding to the back-side central rectangular region 92 are the face portion of the nine element rectangles. The mass of the sole portion 14 corresponding to each of the seven element rectangles excluding the side center rectangular region 91 and the back side center rectangular region 92 is preferably larger.

(Embodiment 2)
Next, Embodiment 2 which is one embodiment of the present invention will be described. FIG. 8 is a schematic cross-sectional view showing the configuration of the wood type golf club head in the second embodiment. 8 corresponds to a cross-sectional view taken along line AA in FIG.

  Referring to FIG. 8, head 1 in the second embodiment has a feature in the thickness distribution of sole portion 14, and head 1 in the second embodiment is basically head 1 in the first embodiment. It has the same configuration and produces the same effect.

  Specifically, with reference to FIGS. 6 and 8, in the head 1 according to the second embodiment, the maximum thickness of the face portion side central portion 141 that is the sole portion 14 corresponding to the face portion side central rectangular region 91 and The maximum thickness of the back side central portion 143 that is the sole portion 14 corresponding to the back side central rectangular region 92 is the maximum thickness of the sole portion 14 corresponding to the toe side central rectangular region 93, and the heel side central rectangular region 95. Is larger than each of the maximum thickness of the sole portion 14 corresponding to the central portion 142 and the maximum thickness of the central portion 142 corresponding to the central rectangular region 94.

  Thus, in the head 1 according to the present embodiment, the mass of the sole portion 14 corresponding to the toe side central rectangular region 93, the central rectangular region 94, and the heel side central rectangular region 95 is reduced, while the face side central rectangular region 91 is reduced. In addition, it is easy to increase the mass of the sole portion 14 corresponding to the back side central rectangular region 92. As a result, in the head 1 according to the present embodiment, it is compatible to maintain the SS height low and to ensure a large longitudinal inertia moment.

(Embodiment 3)
Next, Embodiment 3 which is one embodiment of the present invention will be described. FIG. 9 is a schematic cross-sectional view showing the configuration of the wood type golf club head in the third embodiment. 9 corresponds to a cross-sectional view taken along line AA in FIG.

  Referring to FIG. 9, head 1 in the third embodiment has basically the same configuration as head 1 in the first embodiment and has the same effects. The head 1 according to the third embodiment is characterized in the thickness distribution of the sole portion 14 and the addition of mass by an accessory.

  Specifically, with reference to FIGS. 6 and 9, in the head 1 according to the third embodiment, the maximum thickness of the face side central portion 141 that is the sole portion 14 corresponding to the face side central rectangular region 91 is The maximum thickness of the sole portion 14 corresponding to the toe side central rectangular region 93, the maximum thickness of the sole portion 14 corresponding to the heel side central rectangular region 95, and the central portion 142 which is the sole portion 14 corresponding to the central rectangular region 94. Is greater than each of the maximum wall thickness. Further, in the head 1 according to the third embodiment, the back-side center portion 143 that is the sole portion 14 corresponding to the back-side center rectangular region 92 includes the badge 31 as an accessory for adding mass to the sole portion 14 and Screw 32 is included. That is, the badge 31 is installed by the screw 32 in the back side central part 143.

  Thus, in the head 1 according to the present embodiment, the mass of the sole portion 14 corresponding to the toe side central rectangular region 93, the central rectangular region 94, and the heel side central rectangular region 95 is reduced, while the face side central rectangular region 91 is reduced. In addition, it is easy to increase the mass of the sole portion 14 corresponding to the back side central rectangular region 92. As a result, in the head 1 according to the present embodiment, it is compatible to maintain the SS height low and to ensure a large longitudinal inertia moment.

  In contrast to the case of FIG. 9, a badge 31 is installed with screws 32 on the face side central portion 141, and the maximum thickness of the back side central portion 143 is set to a sole corresponding to the toe side central rectangular region 93. The maximum thickness of the portion 14, the maximum thickness of the sole portion 14 corresponding to the heel side central rectangular region 95, and the maximum thickness of the central portion 142 that is the sole portion 14 corresponding to the central rectangular region 94. However, when the golf club is used, it is avoided that the face portion side center portion 141 corresponding to the front side of the head 1 collides with the ground and the badge 31 and the screw 32 are broken or dropped. From the viewpoint, it is more preferable to adopt the configuration of FIG.

(Embodiment 4)
Next, Embodiment 4 which is one embodiment of the present invention will be described. FIG. 10 is a schematic plan view showing the configuration of the wood type golf club head in the fourth embodiment. FIG. 10 corresponds to a plan view of the head viewed from the sole portion side.

  Referring to FIG. 10, head 1 in the fourth embodiment has basically the same configuration as head 1 in the first embodiment and has the same effects. The head 1 according to the fourth embodiment has a feature in the shape of the sole portion 14.

  Specifically, in the head 1 according to the fourth embodiment with reference to FIG. 10, the periphery of the sole portion 14 on the face portion side (the region of the sole portion 14 corresponding to the face portion side central rectangular region 91 in FIG. A plurality of recesses 14B are formed. As a result, the surface area of the region where the groove 14B is formed increases, so that it is easy to increase the mass of the sole portion 14 corresponding to the face portion side central rectangular region 91. As a result, in the head 1 according to the present embodiment, it is compatible to maintain the SS height low and to ensure a large longitudinal inertia moment.

  In addition, in FIG. 10, although the structure which increases a surface area by forming the groove | channel 14B which is a recessed part was demonstrated, it may replace with a recessed part and may form a convex part, and form both a recessed part and a convex part. May be.

  Further, the distribution of the thickness of the sole portion 14 described in the above embodiment, the addition of mass by an accessory, the shape of the sole portion 14 and the like satisfy the relationship of the mass of each region of the sole portion in claim 1 of the present application. Any combination can be implemented as long as possible.

  Embodiment 1 of the present invention will be described below. In order to demonstrate the effectiveness of the present invention, simulation verification was performed. The simulation procedure is as follows.

The loft angle α of the head was 10 °. Further, the mass of the head comprising a base 170 g, and 3 types of 175g and 180 g, the vertical moment of inertia, respectively and ^{2365g · cm 2, 2433g · cm} 2 and 2500 g · cm ^2. Various heads were assumed by adding mass to point F on the face side of the sole portion, point B on the back side, and point C as the center portion.

  FIG. 11 is a diagram showing the position of mass addition in this simulation verification. In FIG. 11, the horizontal axis corresponds to the axis in the face / back direction, and the vertical axis corresponds to the axis in the crown / sole direction. Referring to FIG. 11, point P represents the position of the center of gravity when no mass is added. The mass was added as a concentrated load on points F, C, and B. The head mass including mass addition was unified to 190 g. The calculation was performed assuming that the face is flat with no bulge and no roll. The position of the point B is set to be higher from the ground (reference plane) than the point F and the point C in consideration of adopting a shape called roll-up in order to improve the omission of the sole. Then, the SS height and the longitudinal moment of inertia were calculated for the base head and the head with mass added at a predetermined position. Table 1 shows the positions of points P, F, C, and B (coordinates in FIG. 11). In Table 1, the unit of numerical values is mm.

  Next, the results of the simulation will be described. FIG. 12 is a diagram illustrating a result of simulation in the first embodiment. In FIG. 12, the horizontal axis indicates the SS height, and the vertical axis indicates the vertical moment of inertia. That is, in FIG. 12, the goal of the present invention is to move the data point to the upper side while suppressing the data point from moving to the right side. Table 2 shows specific data of the simulation in Example 1.

  Referring to FIG. 12, the rear side (back side) with respect to FCB in which mass is added to three points, point F, point C, and point B, simulating a conventional general sole uniform wall thickness model B (corresponding to the configuration of Non-Patent Document 1 and Patent Document 2) whose depth of center of gravity is deepened by concentrating mass addition on the surface increases the moment of inertia, but the SS height is significantly increased. Yes. On the other hand, F (corresponding to the configuration of Patent Document 3), in which the depth of center of gravity is shallow by concentrating mass addition on the front side (face side), although the SS height is lower than the FCB, The increase in the moment of inertia is small. That is, the conventional general head with a uniform wall thickness and the conventional method of adding mass to the front side or the rear side as disclosed in the above-mentioned non-patent document and patent document, the broken line in FIG. The SS height and the longitudinal inertia moment can be adjusted only within the range of the relationship between the SS height and the longitudinal inertia moment shown.

  On the other hand, in the FB corresponding to the embodiment of the present invention, a significant increase in the moment of inertia is achieved while suppressing a slight increase in the SS height relative to the FCB. In other words, according to the head having the FB configuration included in the present invention, the range of the relationship between the SS height and the vertical moment of inertia shown by the broken line in FIG. The longitudinal moment of inertia can be increased. From the above results, it was confirmed that according to the wood type golf club head of the present invention, it is possible to both keep the sweet spot height low and ensure a large moment of inertia.

  From FIG. 12, it can be seen that the lighter the head mass in the state without mass addition, the greater the effect of the present invention. This is because, as the head mass in the state without mass addition is lighter, the surplus mass, that is, the amount of mass addition can be increased, so that the vertical inertia moment can be increased while suppressing the increase in SS height. Therefore, it can be said that the effect of the present invention is further increased by designing the face portion and the crown portion so as to reduce the thickness so as to increase the surplus mass and increase the amount of mass addition as long as the strength allows.

Here, from the results of a separately conducted robot test, when the head speed is 42 m / s, if the SS height is different by 0.5 mm, that is, if the height of the hit point is different by 0.5 mm in the same head, the pop-out angle is 0. It is known that the rotation speed of backspin is different by 20 rpm. Similarly, when the longitudinal moment of inertia is different by 50 g · cm ² , it is understood that when the hit point is 15 mm above and below the SS, the initial ball speed is 0.02 m / s and the backspin speed is different by about 20 rpm. Yes (the jump angle is almost unchanged). On the other hand, when the difference in the number of rotations of the backspin is less than 20 rpm, even if it is an advanced person, it is difficult to experience the difference in performance in consideration of swing variations when actually used. That is, if the difference is 0.5 mm or more in the SS height and the difference is 50 g · cm ² or more in the longitudinal moment of inertia, it can be said that there is a clear difference in the performance of the head.

Considering this, the simulation results are examined. Even when the value of mass addition to the front and rear portions of the sole is 5 g (when the mass of the head without mass addition is 180 g), 180% is obtained. -FB has a longitudinal moment of inertia increased by 60 g · cm ² with respect to 180-FCB and an SS height of 0.5 mm lower with respect to 180-B. Accordingly, it can be said that if the value of mass added to the front and rear portions of the sole is 5 g or more, there is a clear difference in the performance of the head. In the above simulation, the case where the mass of the head including mass addition is set to 190 g is examined, but the same examination result can be obtained even when the mass is larger or smaller than 190 g.

  On the other hand, in the wood type golf club, the length of 9th wood which is a fairway wood is about 41 inches. From the viewpoint of ensuring a swing balance, the mass of the head is generally the largest among wood-type golf clubs, and is generally about 220 g to 230 g. Here, the mass of the head without mass addition can be reduced to about 130 g in consideration of the required strength. Therefore, it is realistic that the value of mass addition to the front and rear portions of the sole is 50 g or less.

Furthermore, the volume of the current mainstream driver head is 400cm ³ ~460cm ³ mm, from the viewpoint of securing strength, mass of the head is required than about 170 g. Further, the length of the driver is usually about 44 to 47 inches, and the mass of the head is generally about 175 to 210 g from the viewpoint of ensuring swing balance. Therefore, assuming a driver head, it is realistic that the value of mass addition to the front and rear portions of the sole is 20 g or less.

  As described above, the mass of the sole portion corresponding to the face side central rectangular region and the mass of the sole portion corresponding to the back side central rectangular region in the present invention are the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region, respectively. It is preferable to increase it by 5 g or more and 50 g or less as compared with the mass of the sole portion corresponding to each of them, and it is preferable to increase it by 5 g or more and 20 g or less when a driver head is assumed. Moreover, when mass is added to the sole part by installing an accessory on the sole part, it is preferable that a mass of 5 g or more and 50 g or less is added by the accessory. It can be said that it is preferable to add mass.

In general driver head dimensions, the length of the sole portion in the toe-heel direction and the length in the front-rear direction (face-back direction) are both about 90 mm. Therefore, the area of the sole part per one element rectangle is about 9 cm ² . And assuming the head made from the titanium alloy which falls into the class with the smallest specific gravity among the general materials which comprise a head, the mass per 1 mm of thickness is 4.05g. Here, as described above, the value of mass addition to the front and rear portions of the sole is preferably 5 g or more, and in order to achieve this, an increase in thickness of 1.23 mm or more is necessary. Therefore, it is desirable that the thickness at the front and rear portions of the sole is about 1.3 mm larger than the center portion of the sole. From the above, the maximum thickness of the sole part corresponding to the face side central rectangular area and the maximum thickness of the sole part corresponding to the back side central rectangular area are the toe side central rectangular area, the heel side central rectangular area, and the central rectangular area. It can be said that it is preferable that it is 1.3 mm or more larger than the maximum thickness of the sole part corresponding to each.

  In addition, when the maximum thickness of the sole portion corresponding to each of the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region is 1 mm or more, it may be difficult to ensure a sufficient amount of mass addition. is there. On the other hand, when the maximum thickness of the sole portion corresponding to the region is less than 0.4 mm, the thickness may be insufficient from the viewpoint of castability and strength. Therefore, it is preferable that the maximum thickness of the sole portion corresponding to each of the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region is 0.4 mm or more and less than 1.0 mm.

  Embodiment 2 of the present invention will be described below. The wood type golf club head of the present invention was actually produced and an experiment was conducted to confirm its performance. The experimental procedure is as follows.

  First, the head having the configuration of FIG. 8 described in the second embodiment and the head having the configuration of FIG. 9 described in the third embodiment were manufactured (Examples A and B). In these heads 1, the thickness of the region including the connection region (frontmost region) with the face portion 11 in the sole portion 14 corresponding to the face-side central rectangular region 91 is changed to the toe-side central rectangular region 93. The maximum thickness of the corresponding sole portion 14, the maximum thickness of the sole portion 14 corresponding to the heel side central rectangular region 95, and the maximum thickness of the sole portion 14 corresponding to the central rectangular region 94 are set larger. There is a particularly preferable configuration in which the function and effect of the present invention can be remarkably obtained by enabling mass addition to a position far from the center of gravity and close to the reference plane. On the other hand, for comparison, a head outside the range of the present invention was also produced (comparative example). FIG. 13 is a schematic cross-sectional view showing a configuration of a wood type golf club head in a comparative example. In FIG. 13, portions corresponding to those in FIGS. 8 and 9 are indicated by reference numbers obtained by adding 100 to the reference numbers used in FIGS. 8 and 9, and description thereof is omitted. The head in the comparative example is the head disclosed in Non-Patent Document 1 described above, and a badge 131 and a screw 132 are installed on the rear side (back side) of the sole portion, and mass is added to the region. Here, in the head 1 of Example A (corresponding to FIG. 8), the maximum thickness of the face side central portion 141 is 3.0 mm, the maximum thickness of the central portion 142 is 0.9 mm, and the back side central portion 143 is The maximum wall thickness was 2.4 mm. In the head 1 of Example B (corresponding to FIG. 9), the maximum thickness of the face side central portion 141 is 3.0 mm, the maximum thickness of the central portion 142 is 0.9 mm, and the mass of the badge 31 is 4 mm. .3 g and the mass of the screw 32 was 2.3 g. Further, in the head 101 of the comparative example (corresponding to FIG. 13), the maximum thickness of the sole portion 114 corresponding to each of the face side central rectangular region 191 and the central rectangular region 194 is 1.4 mm. The mass was 2.0 g, and the mass of the screw 132 was 2.0 g. And the head of the said Example and the comparative example was connected to the shaft, and the actual hit test was implemented.

  Next, test results will be described. Table 3 shows the characteristics of clubs and heads subjected to the actual hit test.

  Referring to Table 3, the club length was 0.5 inches longer than in the comparative example. This is intended to increase the flight distance by increasing the head speed. For this reason, the head mass of the example is 5 g smaller than that of the comparative example in order to ensure swing balance. The reduction in the head weight is disadvantageous for increasing the longitudinal moment of inertia and suppressing the SS height because it reduces the possible mass addition. In the embodiment of the present invention, however, the comparison is made under such severe restrictions. It can be seen that the SS height was successfully lowered while securing the same vertical moment of inertia as in the example. As a result of the actual hit test, it was confirmed that the club with the head of the example can sufficiently experience the ease of rising of the ball and the size of the sweet area as compared with the comparative example.

  In the present application, the sole portion refers to a hosel portion in an area projected on the reference plane (see FIG. 6) in a state where the wood-type golf club head is in contact with the reference plane at a specified lie angle. The area excluding That is, it is defined as a sole part including a conventional side part. Here, in recent shapes of the head, there are many cases where the conventional side portion does not exist, but the present invention can be applied to wood-type golf club heads of various shapes regardless of the presence or absence of the side portion. is there.

  Various materials such as a titanium alloy, stainless steel, and carbon fiber reinforced resin can be employed as the material constituting the wood type golf club head of the present invention. In addition, various materials such as stainless steel, aluminum alloy, and resin can be used as the materials constituting the accessories such as the badge and screw. For example, aluminum alloy is used as the material for the badge, and JIS is used as the material for the screw. By adopting standard SUS303 stainless steel or the like, it is possible to give a high-class appearance.

  In addition, as a material constituting the wood type golf club head of the present invention, a material having a high specific gravity such as a tungsten alloy is employed for the sole portion corresponding to the face side central rectangular region and / or the sole portion corresponding to the back side central rectangular region. May be. As a result, the thickness can be reduced, the SS height can be further reduced, and the longitudinal moment of inertia can be increased.

  Further, in the wood type golf club head of the present invention, the mass of the sole portion corresponding to each rectangular region is confirmed by cutting the sole portion corresponding to each rectangular region by cutting or the like and measuring the mass. Can do. At this time, the mass corresponding to the area of the sole portion lost by cutting or the like is complemented (in addition to the lost mass in the measurement value), and the mass of the sole portion corresponding to each rectangular area is calculated. Further, the separation of the sole portion and the portions other than the sole portion (face portion, crown portion) is performed by cutting the head parallel to the reference plane from the portion corresponding to the outer edge of the sole portion projected onto the reference plane. The

  Further, the wood type golf club head of the present invention characterized by the maximum thickness of the sole portion may be any one as long as the maximum thickness satisfies the requirements of the present invention in addition to the above-described embodiments. Since the thickness of the sole portion corresponding to the region is locally thin, it does not fall outside the scope of the present invention.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The wood-type golf club head and the wood-type golf club of the present invention are particularly advantageously applied to a wood-type golf club head and a wood-type golf club that are required to achieve both improvement in flight distance and stabilization of flight distance. be able to.

1 is a schematic diagram showing a configuration of a golf club in Embodiment 1. FIG. It is the schematic plan view which looked at the golf club head with which the golf club of FIG. 1 is provided from the crown part side. FIG. 2 is a schematic plan view of a golf club head provided in the golf club of FIG. 1 as viewed from the face side. It is the schematic plan view which looked at the golf club head with which the golf club of FIG. 1 is provided from the sole part side. FIG. 2 is a schematic plan view of a golf club head provided in the golf club of FIG. 1 viewed from the toe side. FIG. 2 is a schematic view illustrating a state in which a golf club head included in the golf club of FIG. 1 is projected onto a reference plane and viewed from the sole side. It is a schematic perspective view for demonstrating the moment of inertia in a wood type golf club head. 5 is a schematic cross-sectional view showing a configuration of a wood type golf club head in a second embodiment. FIG. FIG. 5 is a schematic cross-sectional view showing a configuration of a wood type golf club head in a third embodiment. FIG. 10 is a schematic plan view showing a configuration of a wood type golf club head in a fourth embodiment. It is a figure which shows the position of mass addition in simulation verification. It is a figure which shows the result of the simulation in Example 1. FIG. It is a schematic sectional drawing which shows the structure of the wood type golf club head in a comparative example.

Explanation of symbols

  1 head, 2 shaft, 3 grip part, 9 golf club, 11 face part, 11A hitting surface, 12 crown part, 13 hosel part, 14 sole part, 14B groove, 21 sweet spot (SS), 22 center of gravity, 31 badge, 32 screws, 81 face side line segment, 82 back side line segment, 83 heel side line segment, 84 toe side line segment, 85 to 88 line segment, 91 face side central rectangular area, 92 back side central rectangular area, 93 toe side central rectangular Area, 94 central rectangular area, 95 heel side central rectangular area, 141 face side central part, 142 central part, 143 back side central part.

Claims (8)

A wood type golf club head comprising a face portion having a hitting surface, a sole portion connected to the face portion, and a hosel portion to be connected to a shaft,
In a state where the sole portion is in contact with the reference plane at a specified lie angle, the projected image of the golf club head projected onto the reference plane is parallel to the shaft center line projected onto the reference plane. The face side line segment in contact with the face part projected on the reference plane, the back side line segment in contact with the back side opposite to the face part side line segment, and the shaft center line projected on the reference plane. A rectangular region including a heel side line segment that passes through the connecting portion between the hosel part and the main body part projected on the reference plane, and a toe side line segment that contacts the toe side opposite to the heel side line segment, When the rectangular region is divided into nine congruent element rectangular regions by two line segments parallel to the face side line segment and two line segments parallel to the heel side line segment, The mass of the sole portion corresponding to the face-side central rectangular region located in the center on the face side when viewed from the central rectangular region located in the center, and the back-side center opposite to the face portion side The mass of the sole portion corresponding to the back side central rectangular region is the mass of the sole portion corresponding to each of the seven element rectangular regions other than the face side central rectangular region and the back side central rectangular region. Is bigger than
The mass of the sole portion corresponding to the face-side central rectangular region and the mass of the sole portion corresponding to the back-side central rectangular region are the toe-side center located at the toe-side center as viewed from the central rectangular region. The weight of the sole portion corresponding to each of the rectangular region, the heel side central rectangular region located at the heel side center as viewed from the central rectangular region, and the central rectangular region is larger by 5 g or more and 50 g or less ,
Suite height of the spot is equal to or less than 36.2mm more than 35.5mm, vertical moment of inertia is 2827g · cm ² or more 2887g · cm ² or less, wood-type golf club head. A wood type golf club head comprising a face portion having a hitting surface, a sole portion connected to the face portion, and a hosel portion to be connected to a shaft,
In a state where the sole portion is in contact with the reference plane at a specified lie angle, the projected image of the golf club head projected onto the reference plane is parallel to the shaft center line projected onto the reference plane. The face side line segment in contact with the face part projected on the reference plane, the back side line segment in contact with the back side opposite to the face part side line segment, and the shaft center line projected on the reference plane. A rectangular region including a heel side line segment that passes through the connecting portion between the hosel part and the main body part projected on the reference plane, and a toe side line segment that contacts the toe side opposite to the heel side line segment, When the rectangular region is divided into nine congruent element rectangular regions by two line segments parallel to the face side line segment and two line segments parallel to the heel side line segment, The maximum thickness of the sole portion corresponding to the face side central rectangular region located in the center on the face side when viewed from the center rectangular region located in the center and the back side center opposite to the face side. Each of the maximum thicknesses of the sole portion corresponding to the back-side central rectangular region located is a toe-side central rectangular region located at the toe-side center as viewed from the central rectangular region, and a heel-side center as viewed from the central rectangular region The heel side central rectangular area located at the center and the central rectangular area corresponding to each of the central rectangular area is larger than the maximum thickness,
Each of the mass of the sole part corresponding to the face side central rectangular area and the mass of the sole part corresponding to the back side central rectangular area is other than the face side central rectangular area and the back side central rectangular area. It is larger than the mass of the sole portion corresponding to each of the seven element rectangular regions,
The mass of the sole portion corresponding to the face side central rectangular region and the mass of the sole portion corresponding to the back side central rectangular region are the toe side central rectangular region, the heel side central rectangular region and the center, respectively. Compared to the mass of the sole portion corresponding to each of the rectangular regions, it is larger by 5 g or more and 50 g or less ,
Suite height of the spot is equal to or less than 36.2mm more than 35.5mm, vertical moment of inertia is 2827g · cm ² or more 2887g · cm ² or less, wood-type golf club head.   The maximum thickness of the sole portion corresponding to the face side central rectangular region and the maximum thickness of the sole portion corresponding to the back side central rectangular region are the toe side central rectangular region, the heel side central rectangle, respectively. The wood-type golf club head according to claim 2, wherein the wood-type golf club head is 1.3 mm or more larger than a maximum thickness of the sole portion corresponding to each of the region and the central rectangular region. A wood type golf club head comprising a face portion having a hitting surface, a sole portion connected to the face portion, and a hosel portion to be connected to a shaft,
In a state where the sole portion is in contact with the reference plane at a specified lie angle, the projected image of the golf club head projected onto the reference plane is parallel to the shaft center line projected onto the reference plane. The face side line segment in contact with the face part projected on the reference plane, the back side line segment in contact with the back side opposite to the face part side line segment, and the shaft center line projected on the reference plane. A rectangular region including a heel side line segment that passes through the connecting portion between the hosel part and the main body part projected on the reference plane, and a toe side line segment that contacts the toe side opposite to the heel side line segment, When the rectangular region is divided into nine congruent element rectangular regions by two line segments parallel to the face side line segment and two line segments parallel to the heel side line segment, The maximum thickness of the sole portion corresponding to the face-side central rectangular region located in the center on the face side as viewed from the central rectangular region located in the center is located in the center on the toe side as viewed from the central rectangular region. Toe side central rectangular region, the heel side central rectangular region located in the heel side center as viewed from the central rectangular region, and the maximum thickness of the sole portion corresponding to each of the central rectangular region,
The sole portion corresponding to the back side central rectangular region located at the back side center opposite to the face portion side when viewed from the central rectangular region includes an appendage for adding mass to the sole portion. And
Each of the mass of the sole part corresponding to the face side central rectangular area and the mass of the sole part corresponding to the back side central rectangular area is other than the face side central rectangular area and the back side central rectangular area. It is larger than the mass of the sole portion corresponding to each of the seven element rectangular regions,
The mass of the sole portion corresponding to the face side central rectangular region and the mass of the sole portion corresponding to the back side central rectangular region are the toe side central rectangular region, the heel side central rectangular region and the center, respectively. Compared to the mass of the sole portion corresponding to each of the rectangular regions, it is larger by 5 g or more and 50 g or less ,
Suite height of the spot is equal to or less than 36.2mm more than 35.5mm, vertical moment of inertia is 2827g · cm ² or more 2887g · cm ² or less, wood-type golf club head.   The maximum thickness of the sole portion corresponding to the face side central rectangular region is the maximum thickness of the sole portion corresponding to each of the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region. The wood-type golf club head according to claim 4, wherein the wood-type golf club head is 1.3 mm or larger in comparison.   6. The wood type golf club head according to claim 4, wherein a mass of 5 g or more and 50 g or less is added to the sole portion by the accessory.   The maximum thickness of the sole portion corresponding to each of the toe side central rectangular region, the heel side central rectangular region, and the central rectangular region is 0.4 mm or more and less than 1.0 mm. 2. A wood type golf club head according to item 1.   A wood type golf club comprising the wood type golf club head according to claim 1.

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