JP2009022337A - Golf club set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club set allowing a golfer to easily select an optimum golf club according to the carry intended by the golfer by inhibiting irregularity of the height of trajectory of a ball hit by the golfer using golf clubs of respective numbers including wood golf clubs and by uniforming the difference in the carry among the golf clubs of the respective numbers. <P>SOLUTION: The golf club set is composed of wood golf clubs and iron golf clubs. In the golf club set, a wood utility golf club is used instead of a long iron golf club in a conventional golf club set. The difference between the loft angle of the No.3 wood golf club and the loft angle of a driver is set larger than the difference in the loft angle of the No.3 utility golf club and the loft angle of the No.3 wood golf club. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a golf club set, and particularly to a golf club set including a plurality of golf clubs.

  References describing golf club sets including a plurality of golf clubs include, for example, Japanese Patent Laid-Open No. 58-41575 (Patent Document 1), Japanese Patent No. 3055380 (Patent Document 2), and Japanese Patent Publication No. 06-26637. (Patent Document 3), Japanese Patent Application Laid-Open No. 2007-29257 (Patent Document 4), Japanese Patent Application Laid-Open No. 2003-144877 (Patent Document 5), Japanese Patent Application Laid-Open No. 2005-111570 (Patent Document 6), and Japanese Patent Application Laid-Open No. 2002. No.-17902 (Patent Document 7) and the like.

  Generally, a golf club set is composed of 14 wood clubs (driver, fairway wood) and iron clubs (long iron, middle iron, short iron, wedge) plus a putter.

  As a function required for all clubs, the first priority is to accurately hit a golfer's intended flight distance without a mistake.

  On the other hand, in a game called golf, the flight distance is very important from the viewpoint of making the game easier. This is particularly noticeable in wood clubs, and it is a function that has the highest priority for drivers.

  However, in recent rebound regulations, the driver's initial ball speed is regulated, and among the three factors of the ball initial speed, the jump angle, and the spin amount that determine the ball trajectory, the jump angle and spin amount are particularly emphasized. Also, it is important to reduce the decrease in the initial ball speed with respect to the variation in hit points.

  In a golf club set, a wood type club generally has a configuration of 1 W, 3 W, and 5 W. As the count increases, the lie angle and loft angle gradually increase, and the flight distance is gradually reduced by gradually shortening the club length so that the golfer can divide the intended flight distance.

  The iron-type clubs are classified into, for example, 3I and 4I called long irons, 5I, 6I and 7I called middle irons, 8I and 9I called short irons, and PW, FW and SW called wedges. Is done.

  Even in iron-type clubs, the lie angle and loft angle gradually increase as the count increases, and the flight distance is gradually reduced by gradually decreasing the club length so that the golfer can divide the intended flight distance. Has been taken into account.

  However, for 3I and 4I called long irons, the club length is long, the head mass is light, and the sweet area is small. Easy to invite. Therefore, in recent years, there are many cases in which clubs called 7W and 9W called short woods and utility clubs instead of long irons are used in club settings.

Another important factor required for golf clubs is the height of the trajectory. A major criterion for judging whether a golf club is a club that is easy to hit with respect to a golf club is the ease with which the hit ball rises. The actual elevability of the ball corresponds to the ball jump angle after the impact of the golf club, but an actual golfer cannot judge whether the ball jump angle is high or low. For this reason, it is determined whether the hitting ball is easy or difficult to rise, and consequently whether the golf club is easy to hit, depending on the maximum height of the trajectory.
JP 58-41575 A Japanese Patent No. 3055380 Japanese Patent Publication No. 06-26637 JP 2007-29257 A JP 2003-144487 A JP 2005-111570 A Japanese Patent Laid-Open No. 2002-17902

  Conventionally, various studies have been conducted on the height of the ballistics, but in recent years it has become possible to actually measure the actual trajectory after impact. The inventors of the present application have clarified the following facts by actually measuring the trajectory of a professional golfer and a general amateur golfer.

  The fact is that professional golfers, who are very good in terms of physical strength and technology, have almost the same ballistic height at each count, whereas in the case of general amateur golfers, fairway wood (such as 3W) and long irons (3I) , 4I, etc.), the trajectory tends to be low.

  The total flight distance of the hit ball is composed of “carry” until the ball falls and “run” after the ball falls. As described above, when a general amateur golfer hits a ball with a fairway wood or a long iron, since the trajectory tends to be low, the ratio of the run to the total flight distance of the hit ball increases. As a result, the flight distance is likely to be affected by the situation of the hit point of the hit ball, and it becomes difficult to accurately divide the flight distance by selecting the golf club number.

  By the way, in patent document 1, adjusting the moment of inertia and the gravity center position of each golf club which comprises a golf club set is described.

  Patent Document 2 describes that a golf club set that has a large loft angle is equipped with a hand-tuned shaft having a vent point close to the hand.

  Patent Document 3 describes that the degree of the hollow portion of the hollow structure of the iron golf club constituting the golf club set, the position of the center of gravity of the head, and the sole width are adjusted.

  Patent Document 4 describes a method for setting an iron golf club in which two or more golf clubs in a region that does not fly more than the pitching wedge are added.

  Further, in Patent Document 5, the number of vibrations per unit time measured by vibrating the front end portion with the rear end portion of the golf club shaft fixed, and the rear end portion with the front end portion of the golf club shaft fixed. It is described that the magnitude of the ratio to the number of vibrations per unit time measured by vibrating is set in association with the order of golf clubs.

  Patent Document 6 describes that the relationship between the loft angle and the center of gravity height of each golf club constituting the golf club set is adjusted.

  Patent Document 7 describes a golf club set in which a utility golf club is added to an iron type golf club.

  However, in Patent Documents 1 to 7, when the ballistic height of a fairway wood (for example, 3 W) is hit using another golf club by adjusting the loft angle of each golf club constituting the golf club set. It is not described that it is approximately the same as the trajectory height of.

  Furthermore, the “golf club set” in Patent Documents 1 to 6 is composed only of an iron-type golf club. Further, the “golf club set” in Patent Document 7 is obtained by replacing a part of a golf club set composed only of iron-type golf clubs with a utility golf club. Thus, the golf club sets in Patent Documents 1 to 7 are completely different from the golf club set according to the present invention, which includes a wood type golf club.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to suppress variation in ballistic height when a golf ball including a wood type golf club is used to hit a ball. It is another object of the present invention to provide a golf club set that makes it easy for the golfer to select an optimal golf club according to the flight distance intended by the golfer by making the difference in flight distance between the counts substantially equal.

  The golf club set according to the present invention is a golf club set including a plurality of golf clubs. The plurality of golf clubs include a plurality of wood type golf clubs, an iron type golf club, and a utility golf club having an intermediate shape between the wood type golf club and the iron type golf club. The utility golf club has a loft angle larger than that of the plurality of wood type golf clubs and a loft angle smaller than that of the iron type golf club. The plurality of wood type golf clubs includes a first golf club having the smallest first loft angle among the wood type golf clubs, and a second loft next to the first loft angle among the wood type golf clubs. And a second golf club having a corner. The difference between the second loft angle and the first loft angle is greater than the difference between the minimum value of the loft angle of the utility golf club and the second loft angle (more preferably, the second loft angle and the first loft angle are The difference between the maximum loft angle of the utility golf club and the second loft angle is larger).

  In the above configuration, the minimum value of the loft angle of the utility golf club means the loft angle of the club when there is only one utility golf club, and when there are a plurality of utility golf clubs, It means the minimum loft angle among multiple clubs. On the other hand, the maximum value of the loft angle of a utility golf club means the loft angle of the club when there is only one utility golf club, and when there are a plurality of utility golf clubs, Means the maximum loft angle.

  According to the above configuration, by using a utility golf club as a golf club corresponding to a distance of a long iron (3I, 4I, etc.) in a conventional golf club set, a ballistic height is increased in a region corresponding to this distance. Can keep. Further, the difference between the second loft angle that is the loft angle of the fairway wood and the first loft angle that is the loft angle of the driver is the difference between the minimum value of the utility golf club loft angle and the second loft angle. By making it larger, the trajectory height can be kept high in the region corresponding to the distance of the fairway wood. As described above, according to the golf club set according to the present invention, when the conventional golf club set is used, the ballistic height of the hit ball by the general amateur golfer is likely to be low, and the area corresponding to the distance of the fairway wood and the long iron , The ballistic height can be increased. As a result, even in a general amateur golfer, the ballistic height of the hit ball by each golf club can be made substantially the same as in the professional golfer, so that it is easy to select a golf club suitable for the intended flight distance. Is obtained.

  Preferably, in the golf club set, the utility golf club includes a first shaft, the iron-type golf club includes a second shaft, and a bending rigidity at an axially central portion of the first shaft is determined by the second shaft. It is lower than the bending rigidity at the axial center.

  According to the above configuration, by softening the shaft of the utility golf club, the ballistic height in this region can be further improved, so that variation in ballistic height between counts can be further suppressed. .

  According to the present invention, the variation in the ballistic height when the golf clubs including the wood type golf clubs are hit using each golf club is suppressed, and the difference in the flight distance between the golf clubs becomes substantially equal. The golfer can easily select an optimal golf club according to the intended flight distance.

Embodiments of the present invention will be described below.
FIG. 22 is a view showing a golf club set according to one embodiment of the present invention. Referring to FIG. 22, golf club set 1000 according to the present embodiment includes a wood type golf club WO, an iron type golf club IR, and a utility golf club UTY.

  The golf club set according to the present embodiment is a group of golf clubs other than putters (that is, a set of 13) included in a total of 14 full sets. The golf club set includes, for example, a total of 7 half halves. It may be a golf club group (that is, a set of 6) other than the putters included in the set.

  In the golf club set, the wood-type golf club WO includes a driver WO1 and a fairway wood WO2. Typically, as the fairway wood WO2, a plurality of golf clubs (for example, 3W, 5W, and 7W) are prepared. However, the fairway wood WO2 may be singular.

  The loft angle of a wood-type golf club increases sequentially according to the number. For the driver WO1, a loft angle of, for example, about 8 ° to 14 ° (preferably, about 8 ° to 12 °) is applied, and for 3W, a loft angle of, for example, about 16 ° to 18 ° is applied. Then, for example, a loft angle of about 19 ° to 21 ° is applied, and for 7 W, a loft angle of about 22 ° to 24 ° is applied. That is, the wood-type golf club WO includes a driver WO1 as a “first golf club” having the smallest “first loft angle” and a “second loft angle” next to the “first loft angle”. No. 3 wood (3W) as “second golf club”.

  A wood-type golf club head constituting a wood-type golf club is typically a golf club head having a metal outer shell structure, and includes a face portion, a back portion, a heel portion, a toe portion, a sole portion, and a crown portion. It is comprised including.

  The wood type golf club head may be made of a single metal or a combination of a plurality of metals. Further, a combination of a metal and a carbon fiber reinforced resin may be used. Further, the inside of the outer shell structure of the golf club head may be a cavity or may be filled with a foam or the like.

  Examples of the metal constituting the wood type golf club head include iron such as soft iron, titanium, special steel, stainless steel, aluminum, magnesium, tungsten, copper, nickel, zirconium, cobalt, manganese, zinc, silicon, tin, chromium and An alloy containing these is used.

  The wood type golf club head may be constituted by a single member or may be constituted by combining a plurality of members. When a wood-type golf club head is composed of a plurality of members, for example, it is conceivable to join a face member made by forging and other parts formed by precision casting by welding. It is also conceivable that the crown part and the other part are constituted by separate members.

  In the golf club set, the utility golf club UTY is a golf club having an intermediate shape between a wood type golf club and an iron type golf club. In general, utility golf clubs include an iron-based club having a shape that is relatively close to an iron-type club head and a wood-type club having a shape that is relatively close to a wood-type club head. The utility golf club UTY according to the embodiment is typically a wood-based club having a hollow structure.

  As the utility golf club UTY, typically, a plurality of golf clubs (for example, 2W of 3W-UTY and 4W-UTY) are prepared, but the number of utility golf clubs UTY may be one.

  When multiple utility golf clubs UTY are prepared, the loft angle of a utility golf club becomes large sequentially according to a count. For example, in the third utility club (3W-UTY), for example, a loft angle of about 20 ° to 22 ° is applied, and in the fourth utility club (4W-UTY), for example, about 21 ° to 25 °. Loft angle is applied. However, the loft angle of the utility golf club UTY is smaller than the loft angle of the iron-based golf club IR.

  The golf club head constituting the wood-based utility golf club UTY includes a face portion, a back portion, a heel portion, a toe portion, a sole portion, and a crown portion, like the golf club head of a wood type golf club. . The club head may be made of a single metal, or may be a combination of a plurality of metals or other materials. The material that can constitute the club head is the same as that of the golf club head of the wood type golf club. Furthermore, the point which may be comprised from a single member and may be comprised by combining a some member is the same as that of the case of a wood type golf club head.

  In the above golf club set, the iron type golf club IR is typically composed of a plurality of golf clubs (for example, 5I, 6I, 7I, 8I, 9I, PW, FW, SW). The loft angle of the iron type golf club is sequentially increased in the order of 5I, 6I, 7I, 8I, 9I, PW, FW, and SW.

  An iron type golf club head constituting an iron type golf club typically includes a face portion, a back portion, a heel portion, a toe portion, and a sole portion.

  The iron type golf club head may be made of a single material, or may be a combination of a plurality of materials.

  As the metal constituting the iron type golf club head, for example, iron such as soft iron, titanium, stainless steel and alloys containing these are used.

  The iron type golf club head may be constituted by a single member or may be constituted by combining a plurality of members. When the iron-type golf club head is composed of a plurality of members, for example, it is conceivable to join a face member produced by forging and other parts formed by precision casting by welding.

  One feature of the golf club set according to the present embodiment is that the difference between the loft angle of the No. 3 wood and the loft angle of the driver is the difference between the loft angle of the No. 3 utility golf club (3W-UTY) and the No. 3 wood. This is because it is set larger than the difference from the loft angle. More specifically, for example, the difference between the loft angle of No. 3 wood and the loft angle of the driver is set to about 6 ° or more and 8 ° or less, and the loft angle of No. 3 utility golf club (3W-UTY) and 3 The difference from the loft angle of the wood is set to about 3 ° to 5 °. By doing in this way, even if it is a general amateur golfer who does not reach a professional golfer in terms of physical strength and technology, it is possible to obtain a relatively high trajectory height when hit with a No. 3 wood.

  Another feature of the golf club set according to the present embodiment is that a wood-based utility golf club UTY is used in place of the long iron (3I, 4I, etc.) in the conventional golf club set. By doing so, the ballistic height can be kept high in the region corresponding to the distance of the long iron.

  Still another feature of the golf club head according to the present embodiment is that, as the shaft of the utility golf club UTY, a relatively soft wood-based shaft is used with respect to the iron-based shaft. More specifically, the bending stiffness at the axially central portion of the “first shaft” included in the utility golf club UTY is the bending stiffness at the axially central portion of the “second shaft” included in the iron type golf club IR. It is set lower than the rigidity. By doing in this way, the ballistic height at the time of hitting using a utility golf club can further be improved.

  As described above, according to the golf club set according to the present embodiment, when a conventional golf club set is used, the ballistic height of a hit ball by a general amateur golfer tends to be low, and it corresponds to the distance of a fairway wood or a long iron. The height of the trajectory can be increased in the area to be operated. As a result, even in a general amateur golfer, the ballistic height of the hit ball by each golf club can be made substantially the same as in the professional golfer, so that it is easy to select a golf club suitable for the intended flight distance. Is obtained.

  In the following, one embodiment of the present invention will be described. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and the description thereof may not be repeated.

  FIGS. 1-4 is a figure which shows the wood type golf club contained in the golf club set which concerns on a present Example. 2 to 4 show states of the golf club shown in FIG. 1 as seen from the directions of arrows II, III, and IV, respectively.

  1 to 4, a wood golf club 100 constitutes a driver (1W) or a fairway wood (3W, 5W, 7W) in a golf club set according to this embodiment, and includes a face portion 110. And a back portion 120, a heel portion 130, a toe portion 140, a sole portion 150, and a crown portion 160.

  As shown in FIGS. 3 and 4, the head of the wood golf club 100 according to the present embodiment has a substantially pentagonal planar shape. By doing so, the head weight is dispersed in the toe-heel direction and the moment of inertia in the toe-heel direction (inertia moment about the vertical axis) is increased as compared with the case where the head is formed in a substantially spherical shape. be able to. As a result, since it is allowed to slightly reduce the torsional rigidity of the shaft, the golf club head can run smoothly during a swing by using a shaft having a relatively low torsional rigidity.

  The club head of the driver (1W) according to this example is a forged face member made of a titanium alloy (Ti-4.5Al-2Mo-1.6V) and a precision casting made of a titanium alloy (Ti-6Al-4V). It is formed by joining the main body member.

The specifications of the driver are as shown in Tables 1 and 2.
Here, “loft angle”, “lie angle”, and “face angle” in Table 1 and Tables 3 and 5 described later will be described with reference to FIGS.

  As shown in FIG. 18, the loft angle θ <b> 1 is a predetermined value for a golf club 10 including a face portion 11, a back portion 12, a heel portion 13, a toe portion 14, a sole portion 15, and a crown portion 16. It means the angle between the vertical plane and the face plane when addressed by an angle. Further, the intersection of the perpendicular line drawn from the center of gravity G of the golf club 10 toward the face surface and the face portion 11 becomes the sweet spot SS of the golf club 10. The distance between the center of gravity G and the sweet spot SS is the center of gravity depth D.

  As shown in FIG. 19, the lie angle θ2 means an angle formed by the horizontal plane and the shaft axis when the golf club 10 is addressed at a predetermined angle.

  As shown in FIG. 20, the face angle θ3 means an angle formed by a plane perpendicular to the hitting line and the face surface when the golf club 10 is addressed at a predetermined angle.

  Further, “club length” in Table 1 and Table 3, Table 5, Table 7 and Table 9 described later (the length measured from the upper end of the shaft grip (the front end on the hand side) to the sole surface of the club head along the axis of the shaft. For ()), inch display and meter display are shown together (the value in parentheses is the value in meter display).

  The “hardness” of the shafts in Tables 1 and 2 and Tables 3 to 8 to be described later is a parameter corresponding to the bending rigidity of each shaft. In the examples of Tables 1 to 8, “S”, It becomes soft (that is, bending rigidity is low) in the order of “SR” and “R”.

  “Balance” in Table 1 and Table 3, Table 5, Table 7, and Table 9 described later is a parameter corresponding to the distance from the hand of each golf club to the center of gravity. Table 1, Table 3, Table 5 In the example of Table 7, the distance from the hand to the center of gravity becomes shorter in the order of “D3”, “D2”, “D1”, “D0”, “C9”.

  “Torque” in Table 2 and Table 4, Table 6 and Table 8 described later is a parameter corresponding to the torsion angle of the shaft when a predetermined torsional force is applied. It means that it is easy to twist (that is, the torsional rigidity is low).

  “Tone” in Table 2 and Table 4, Table 6, and Table 8 to be described later is referred to as “first”, “middle”, “hand (original)” depending on which portion of the shaft is liable to bend. It is expressed in terms of expression.

  FIG. 5 shows the distribution (EI distribution) of the bending stiffness between the shaft (α in FIG. 5) constituting the driver according to the present embodiment and the shaft (β in FIG. 5) constituting the driver according to the comparative example. FIG. 5 and FIG. 9 described later, the horizontal axis indicates the distance from the club head side end of the golf club shaft.

  Referring to FIG. 5, in both the examples of α and β, the bending rigidity of the shaft increases from the club head side toward the grip side. On the other hand, the driver according to the present embodiment (α in FIG. 5) has a slightly higher bending rigidity at the axial center than the driver according to the comparative example (β in FIG. 5).

  The club head of the fairway wood (3W, 5W, 7W) according to this example includes a forged crown member (thickness: 0.45 mm) made of a β-based titanium alloy (Ti-15V-3Cr-3Sn-3Al), and SUS630. It is formed by joining the main body member of precision casting which consists of. Thus, by reducing the weight of the crown member, the center of gravity of the club head can be lowered.

  The specifications of the fairway wood are as shown in Tables 3 and 4.

  FIG. 6 is a diagram showing a utility golf club included in the golf club set according to the present embodiment.

  Referring to FIG. 6, a utility golf club 200 is a wood-based utility golf club having a metal outer shell structure (hollow structure), and is replaced with a long iron (3I, 4I) in a conventional golf club set. It is used. As shown in FIG. 6, the utility golf club 200 includes a face part 210, a back part 220, a heel part 230, a toe part 240, a sole part 250, and a crown part (not shown in FIG. 6). It is comprised including.

  In the present specification, utility golf clubs corresponding to No. 3 irons and No. 4 irons in a conventional golf club set are respectively referred to as No. 3 utility golf clubs (3W-UTY) and No. 4 utility golf clubs (4W). -UTY).

  The club head of the utility golf club 200 (3W-UTY, 4W-UTY) according to the present embodiment is formed by joining, for example, a forged face member made of SUS630 and a precision cast body member made of SUS630. .

  The specifications of the utility golf club are as shown in Tables 5 and 6.

  By the way, as shown in Table 1 and Table 3 described above, in this example, the loft angle of the driver (1W) is 9 to 11 °, and the loft angle of the third wood (3W) is 17 °. That is, the difference in loft angle between No. 3 wood and the driver is 6 to 8 °.

  On the other hand, as shown in Table 5, the 3rd utility golf club (3W-UTY) is 21 °, and the 4th utility golf club (4W-UTY) is 24 °. That is, the difference between the minimum value of the loft angle of utility golf club 200 (21 °) and the loft angle of No. 3 wood (17 °) is 4 °, and the minimum value of the loft angle of utility golf club 200 (24 °). And the loft angle of No. 3 wood (17 °) is 7 °.

  Thus, in this example, the difference in loft angle (6-8 °) between the No. 3 wood and the driver is the difference between the minimum value of the loft angle of the utility golf club and the loft angle of the No. 3 wood (4 Is formed larger than °). When the driver's loft angle is 9 °, the difference in loft angle between the 3rd wood and the driver (8 °) is the difference between the maximum value of the utility golf club loft angle and the 3rd wood loft angle. Is larger than the difference (7 °).

  7 and 8 are views showing an iron type golf club included in the golf club set according to the present embodiment. FIG. 8 is an exploded perspective view of the iron type golf club shown in FIG.

  7 and 8, an iron golf club 300 includes a middle iron (5I, 6I, 7I), a short iron (8I, 9I), and a wedge (PW, FW, SW) in the golf club set according to this embodiment. ), And includes a face portion 310, a back portion 320, a heel portion 330, a toe portion 340, and a sole portion 350.

  The club head of the iron golf club 300 (5I to SW) according to this example is a forged face member (thickness: 2.2 mm) made of a β-based titanium alloy (Ti-15Mo-5Zr-3Al) for 5I to PW. ) And a precision casting main body member made of SUS630, and FW and SW are made of a precision casting main body member made of SUS630.

The specifications of the iron golf club are as shown in Tables 7 and 8.
Here, the “sole angle” in Table 7 will be described with reference to FIG. The “loft angle” and “lie angle” in Table 7 are the same as those in Tables 1, 3 and 5.

  As shown in FIG. 21, the sole angle θ4 is the leading edge side sole surface and the horizontal plane when the golf club 20 including the face portion 21, the back portion 22, and the sole portion 25 is addressed at a predetermined angle. Means the angle between

  FIG. 9 is a diagram showing a bending stiffness distribution (EI distribution) of the shafts constituting the above-described golf clubs. In the example of FIG. 9, the bending rigidity of the golf club shaft increases from the club head side toward the grip side.

  Referring to FIG. 9, paying attention to the vicinity of the center in the axial direction of each shaft (for example, the horizontal axis in FIG. 9: a position of 500 mm), the bending rigidity of the shaft constituting the driver (A in FIG. 9), the fairway wood Is substantially the same as the bending rigidity (B in FIG. 9) of the shaft constituting the iron golf club, and the bending rigidity (D in FIG. 9) of the iron golf club is in a higher region. The bending rigidity (C in FIG. 9) of the shaft constituting the utility golf club is intermediate between the wood golf club (A and B) and the iron golf club (D). As described above, in this embodiment, the bending rigidity of the shaft of the utility golf club is formed to be lower than the bending rigidity of the shaft of the iron golf club in the axial center region of the shaft.

Below, the measuring method of the bending rigidity distribution of a golf club shaft is demonstrated.
The bending stiffness value can be obtained by the following calculation formula from the displacement-load inclination in the three-point bending test.
EI = (W / δ) × L 3/48
EI: Flexural rigidity value, W: Load, δ: Deflection amount (displacement) of load point, L: Span (distance between fulcrums)
Various conditions in the three-point bending test conducted by the inventors of the present application are as follows.

  The fulcrum is R10 (radius 10mm), the distance between the fulcrum: span L is set to 200mm, the load point is R75mm (radius 75mm) indenter jig (made of iron), the center part between fulcrum Set to load. The test speed is 2 mm / min, and W / δ is data of deflection amount change (displacement) when the load is 10 kgf (98 N) to 20 kgf (196 N). Thereby, the bending rigidity value of the load point is obtained. The bending stiffness distribution is obtained by repeating the measurement by moving the load point.

On the other hand, the measurement of the bending rigidity value by the four-point bending test is effective when the wall thickness is thin relative to the outer diameter (particularly at the hand portion). In the case of a four-point bending test, the bending stiffness value is calculated by the following equation.
EI = (W / δ) × (a / 48) × (3L ² −4a ² )
EI: Flexural rigidity value, W: Load (However, there are two load points, each load is W / 2), L: Span (distance between fulcrums), δ: Central part of span (central part between fulcrums) Deflection amount (displacement), a: distance from one fulcrum to the adjacent load point, (La) / 2: distance between two load points Various values in the four-point bending test conducted by the inventors of the present application The conditions are as follows:

  The fulcrum is R75 (radius 75mm), the load point is R75mm (radius 75mm) indenter jig (made of iron), the distance between the fulcrum: span L is set to 300mm, and two load points The distance between them was set to 130 mm, that is, the distance from the fulcrum on one side to the adjacent load point: a was set to 85 mm. The test speed is 2 mm / min, and W / δ is data of deflection amount change (displacement) when the load is 15 kgf (147 N) to 20 kgf (196 N). Thereby, the bending rigidity value of the center part of two load points is calculated | required. The bending stiffness distribution is obtained by repeating the measurement by moving the load point.

In addition, a strain gauge in one direction is attached to the longitudinal direction of the golf club shaft at the position where the bending rigidity value is to be measured, the grip portion of the shaft is fixed, and the strain changes when a load is applied to the head side of the shaft. There is also a method of calculating the bending stiffness value EI by measuring ε. In this case, the bending stiffness value is calculated by the following equation.
EI = (W × L) × (d / 2) / ε
EI: bending stiffness value, W: load, L: distance from the strain measurement position to the load point, d: outer diameter of the strain measurement position, ε: strain amount Test using a strain gauge conducted by the inventors The following are the conditions.

  First, a strain gauge is affixed at a position where the bending stiffness value is to be measured. Next, 50 mm on the grip side of the shaft is fixed with a cylindrical chuck (three-claw chuck) so that the strain gauge is on the upper surface. The load point is applied from the position of the strain gauge to the position of the head side L of the shaft: 700 mm. As a loading method, a weight of W: 1 kgf (9.8 N) is suspended. The output value of the strain gauge before and after the weight is suspended is used as the strain amount ε. The outer diameter d of the strain measurement position is measured separately.

  Next, effects of the golf club set according to the present embodiment will be described. When developing the golf club set according to the present embodiment, the inventor of the present application conducts experiments by trial hitters of general amateur golfers, female professional golfers, and male professional golfers as samples having different physical strength and technical aspects.

  FIGS. 10 and 11 are graphs showing examples of the maximum hit height and carry when a general amateur golfer hits a golf club of each count. In addition, the head speed (1W) of the golfer according to FIG. 10 is 46.6 m / s, and the head speed (1W) of the golfer according to FIG. 11 is 42.7 m / s.

  10 and 11 and FIGS. 12 to 17 described later, the bar graph indicates the maximum hit height (m) of the hit ball, and the line graph indicates the carry of the hit ball (distance from the hit point to the drop point). Is shown. 10 to 17, regarding the carry, the yard display and the meter display are shown together (the parentheses are the meter display).

  Referring to FIG. 10 and FIG. 11, what is common to both general amateur golfers is that the maximum hit height (ballistic height) of the hit ball by 3W, 3I, 4I corresponding to a relatively long distance is relatively It is low (25 m or less). In this way, when the ballistic height is low in a club for hitting a long distance, the ratio of the run (distance from the falling point to the stop point) in the total flying distance of the hit ball is high, so the total flying distance is It becomes easy to be influenced by the situation of the fall point (the inclination angle of the ground, the situation of the turf surface, etc.).

  FIGS. 12 and 13 are graphs showing examples of the maximum hit height and carry when a female professional golfer hits a golf club of each count. Note that the head speed (1 W) of the golfer according to FIG. 12 is 39.4 m / s, and the head speed (1 W) of the golfer according to FIG. 13 is 38.3 m / s.

  Referring to FIG. 12 and FIG. 13, even in the female professional golfers, the result that the trajectory height of the hit ball by 3W, 4I corresponding to a relatively long distance is relatively low is common to both golf players.

  In the case of male professional golfers (FIGS. 14 and 15), the maximum hitting heights of the golf clubs of the respective counts are substantially the same, whereas general amateur golfers (FIGS. 10 and 11) and female professional golfers In the case of (FIGS. 12 and 13), as for the reason that the maximum hit height of hitting balls by some golf clubs is lowered, for amateur golfers, the hit points are technically varied, and further, the loft angle of impact and blow There is a possibility that the corners vary (impact loft angle means the loft angle immediately before hitting the ball (impact) during actual swing. That is, the deflection of the shaft and the inertial characteristics of the golf head Due to the influence, the golf head has various inclinations during the swing, so the loft angle in the stationary state and the The blow angle represents the trajectory of the golf head at the time of impact and is roughly divided into a down blow and an upper blow. During the swing, the behavior of the golf head is from the top to the bottom with respect to the horizontal plane at the time of impact, and the upper blow represents the case where the behavior of the golf head is from the bottom to the top with respect to the horizontal plane at the time of impact. The blow angle represents the above-mentioned angle.) For a female professional golfer, the head speed is relatively slow (40 m / s or less). The relationship between the head speed, the maximum trajectory height of the trajectory, and the carry (in the case of 3 W) is explained by the simulation results shown in FIG. As shown in FIG. 17, as the head speed increases, the maximum reachable height and carry of the trajectory also increase. Conversely, the lower the head speed, the smaller the maximum trajectory height and carry.

  FIG. 16 is a graph showing the maximum reach height of each hitting ball and the carry simulation result (condition: 1 W, head speed 43 m / s) when the golf club set according to this example is used for hitting.

  Referring to FIG. 16, when a golf ball according to this embodiment is used for hitting, clubs (3W, 3W-UTY, 4W-) corresponding to 3W, 3I, 4I, which have been apt to have a low trajectory conventionally. Also in UTY), a high trajectory (maximum reach height: 25 m or more) can be secured. In the graph of FIG. 16, the line graph is formed in a substantially linear shape. This means that the carry difference between the respective counts is substantially constant. As described above, according to the golf club set according to the present embodiment, by making the difference in carry between the respective counts substantially constant, it is possible to facilitate selection of the count during play and to facilitate game making. .

  In this embodiment, as described above, a utility golf club shaft that is softer (below the bending rigidity) than the iron golf club shaft (hereinafter referred to as “wood shaft”) is applied. Yes. In order to demonstrate the effect by doing in this way, this inventor performed the test by five test hitters.

  As the clubs used in the above test method, clubs each having a shaft for iron and a club having a shaft for wood softer than that for iron are prepared according to the two specifications shown in Table 9 (that is, 2 × 2 = 4 types of clubs are prepared). Then, for each spec, trial hits are made with the iron shaft and the wood shaft, and the ballistic height and the flight distance are subjected to relative evaluation by sensuality. The evaluation results are shown in Table 10.

  The results shown in Table 10 revealed the superiority of the wood shaft over the iron shaft. This tendency is particularly remarkable in the third utility golf club (3W-UTY) having a small loft angle.

  Table 11 shows the loft angle of each count of the golf club set according to the above-described embodiment. In recent years, there is a tendency to raise the loft angle of a club with a relatively short flight distance. However, in this embodiment as well, the loft angle is set higher than the above example in the range of 4W-UTY to SW. May be. In Table 11, such a modification is shown as “strong loft angle”.

  Although the embodiments and examples of the present invention have been described above, the embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. 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.

It is a figure which shows the state which looked at the wood type golf club contained in the golf club set which concerns on one Example of this invention from the toe part side. It is a figure which shows the state which looked at the wood type golf club shown by FIG. 1 from the direction of arrow II. It is a figure which shows the state which looked at the wood type golf club shown by FIG. 1 from the direction of arrow III. It is a figure which shows the state which looked at the wood type golf club shown by FIG. 1 from the direction of arrow IV. It is a figure which shows the shaft bending rigidity distribution of the driver contained in the golf club set which concerns on one Example of this invention. It is a figure which shows the state which looked at the utility golf club contained in the golf club set which concerns on one Example of this invention from the sole part side. 1 is a perspective view showing an iron type golf club included in a golf club set according to one embodiment of the present invention. 1 is an exploded perspective view showing an iron type golf club included in a golf club set according to one embodiment of the present invention. It is a figure which shows the shaft bending rigidity distribution of the several golf club contained in the golf club set which concerns on one Example of this invention. It is the graph (the 1) which shows an example of the highest reach | attainment height and carry of a hit ball when an amateur golfer hits a golf club of each count. It is a graph (the 2) which shows an example of the highest hit | attained height and carry of a hit ball when an amateur golfer hits a golf club of each count. It is a graph (the 1) which shows an example of the highest hit height of a hit ball, and a carry when a female professional golfer hits a golf club of each count. It is a graph (the 2) which shows an example of the highest hit height and carry when a female professional golfer hits a golf club of each count. It is the graph (the 1) which shows an example of the highest reach | attainment height and carry of a hit ball when a male professional golfer hits with a golf club of each count. It is the graph (the 2) which shows an example of the highest reach | attainment height of a hit ball, and a carry when a male professional golfer hits with a golf club of each count. It is a graph which shows the simulation result of the highest reach | attainment height of a hit ball and a carry at the time of hitting using the golf club of each count which comprises the golf club set which concerns on one Example of this invention. It is the graph which showed the simulation result of the head speed at the time of hitting using a fairway wood, the maximum hit height of a hitting ball, and carry. It is FIG. (1) explaining the various design values in a golf club. It is FIG. (2) explaining the various design values in a golf club. It is FIG. (3) explaining the various design values in a golf club. It is FIG. (4) explaining the various design values in a golf club. It is a figure which shows the golf club which comprises the golf club set which concerns on one embodiment of this invention.

Explanation of symbols

  10,20 Golf club, 11,21,110,210,310 Face part, 12, 22, 120, 220, 320 Back part, 13, 130, 230, 330 Heel part, 14, 140, 240, 340 Toe part, 15, 25, 150, 250, 350 Sole part, 16, 160 Crown part, 100 wood golf club, 200 utility golf club, 300 iron golf club, 1000 golf club set, WO wood type golf club, WO1 driver, WO2 fairway wood , UTY utility golf club, IR iron type golf club.

Claims (3)

A golf club set including a plurality of golf clubs,
The plurality of golf clubs include a plurality of wood type golf clubs, an iron type golf club, and a utility golf club having an intermediate shape between the wood type golf club and the iron type golf club,
The utility golf club has a loft angle larger than the plurality of wood type golf clubs, and a loft angle smaller than the iron type golf club,
The plurality of wood-type golf clubs include a first golf club having a smallest first loft angle among the wood-type golf clubs, and a second golf club next to the first loft angle among the wood-type golf clubs. A second golf club having a loft angle of 2;
A golf club set in which a difference between the second loft angle and the first loft angle is greater than a difference between a minimum value of the utility golf club and the second loft angle.   2. The golf club according to claim 1, wherein a difference between the second loft angle and the first loft angle is larger than a difference between a maximum loft angle of the utility golf club and the second loft angle. set. The utility golf club includes a first shaft;
The iron-type golf club includes a second shaft,
The golf club set according to claim 1 or 2, wherein a bending rigidity at an axially central portion of the first shaft is lower than an bending rigidity at an axially central portion of the second shaft.

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