JP2006271481A - Golf club head and golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head and a golf club with a high hitting angle without affecting the carry and with the excellent stability of the carry. <P>SOLUTION: The golf club head comprises a head body with a face for hitting a golf ball, and a hosel part with an insertion hole into which a golf club shaft is inserted. The face of the head body is formed at a prescribed loft angle. In the golf club head, the ratio of the height h of the hosel to the height H of the head (h/H) is not more than 0.7, and F<SB>P</SB>is not more than 5 mm when the height H (mm) of the head is the vertical height from a horizontal plane to the highest point of a crown part of the head body when the golf club head is disposed on the horizontal plane in such a way that the face makes a prescribed loft angle, and the height h (mm) of the hosel is the vertical height from the horizontal plane to a joint part where the golf club shaft is jointed, and the distance between the axis of the insertion hole and the position of the distal end of the face is F<SB>P</SB>. The loft angle is at least 25°. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a golf club head and a golf club having a high launch angle and excellent flight distance stability without affecting the flight distance.

  In golf clubs, the required performance differs depending on the type. For example, No. 1, 3 and 5 wood golf clubs, and No. 3 and 4 long irons are required to have a flight distance. In addition, short irons are required to have accurate flight distance.

  In wood-based golf clubs and long irons, it is known that the flight distance can be obtained by increasing the hitting angle of the ball and further reducing the backspin amount.

In order to obtain a flight distance, in a wood-based golf club, the crown portion of the golf club head is composed of a member having a rigidity lower than that of the face portion. Some golf clubs have achieved spin.
In addition, in order to increase the flight distance, some metalwood golf clubs have increased the effective mass utilized for hitting by eliminating the hosel part and directly joining the golf club shaft to the golf club head. (For example, refer to Patent Document 1).

On the other hand, in short irons, increasing the launch angle and increasing the backspin amount reduce run (rolling distance after landing) and increase flight distance stability. ing. Runs are easily affected by the state of the landing point (turf, etc.), and the distance varies greatly.
In short irons, it is possible to increase the hitting angle and increase the backspin amount by increasing the loft angle. Thereby, the run is reduced and the stability of the flight distance is improved.

US Pat. No. 5,042,806

  However, in a short iron, simply increasing the loft angle reduces the number of runs and improves the flight distance stability, but the flight distance itself changes. For this reason, there is no golf club having both a predetermined flight distance and a flight distance stability, and a golf club having a high flight distance stability while maintaining the flight distance is desired. Yes.

  An object of the present invention is to solve the above-mentioned problems of the prior art, and provide a golf club head and a golf club having a high launch angle and excellent flight distance stability without affecting flight distance. There is to do.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a head body having a face surface for hitting a golf ball, and a hosel portion having an insertion hole into which a golf club shaft is inserted. A golf club head having a surface formed at a predetermined loft angle, and when the face surface is arranged on a horizontal surface so as to have the predetermined loft angle, from the horizontal surface to the highest point of the crown portion of the head body The vertical height of the head is H (mm), and the golf club shaft in the hosel part is joined from the horizontal plane when the face surface is arranged on the horizontal plane so as to have the predetermined loft angle. When the vertical height up to is the hosel height h (mm), the ratio (h / H) of the hosel height h to the head height H is 0.7 or less. The loft angle is 25 ° or more, and when the face surface is arranged on a horizontal plane so as to have the predetermined loft angle, the axis of the insertion hole, the most advanced position of the face surface, and the horizontal plane when the F _p the distance in a direction parallel to, is to provide a golf club head, wherein said F _p is 5mm or less.

  In the present invention, it is preferable that the hosel part is provided with a pin in the center of the insertion hole, and the pin is inserted into a hollow part of a hollow golf club shaft.

  Further, in the present invention, the insertion hole of the hosel part penetrates to the sole part, and the opening part on the sole part side of the insertion hole is projected onto a plane perpendicular to the axis of the insertion hole. It is preferable that the projected shape has a distribution with a predetermined curvature.

  According to a second aspect of the present invention, there is provided the golf club head according to the first aspect of the present invention, and a golf club shaft having a tip portion inserted into the insertion hole of the hosel portion and joined thereto. A golf club is provided.

  In the present invention, it is preferable that the golf club shaft further includes a diameter expanding means for expanding the diameter of the tip after the tip of the golf club shaft is inserted into the insertion hole of the hosel.

In the present invention, the golf club shaft is preferably provided with a notch extending in the longitudinal direction at the tip.
Furthermore, in the present invention, it is preferable that the golf club head and the golf club shaft are joined by welding.

According to the golf club head of the first aspect of the present invention and the golf club of the second aspect of the present invention, when the face surface is arranged on the horizontal plane so as to have a predetermined loft angle, the crown of the head body from the horizontal plane. When the head height H (mm) is set as the vertical height to the highest point of the portion, and the face surface is arranged on the horizontal plane so as to have a predetermined loft angle, the golf club shaft in the hosel portion is joined from the horizontal plane. When the vertical height to the joint is the hosel height h (mm), the ratio (h / H) of the hosel height h to the head height H is 0.7 or less, and the loft angle is 25 ° or more. further when the face surface is arranged in a horizontal plane to a predetermined loft angle, the axis of the insertion hole, a distance in a direction parallel to the cutting edge position and the horizontal plane of the face surface when the F _p, By the F _p and 5mm or less, easily cause deformation of the golf club shaft to be joined, when struck with a golf ball at the sweet spot of the head body, it is possible to increase the launch angle. Further, by making the F _p and 5mm or less, a force in a direction to reduce the backspin rate of the golf ball because not act, backspin amount is maintained. In this way, high launch and high spin can be realized, flight distance can be obtained, and flight distance stability can also be realized.

  Hereinafter, a golf club head and a golf club of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a schematic perspective view showing a golf club according to a first embodiment of the present invention, and FIG. 2 is a partial sectional view showing a hosel part of the golf club of FIG.
As shown in FIG. 1, the golf club 10 has, for example, a golf club head 12, a golf club shaft 14, and a grip 16.

  As the golf club shaft 14, for example, a hollow one made of a metal or alloy (steel), or a fiber reinforced composite material such as FRP or CFRP is used.

  The golf club head 12 has a golf club head main body portion 13 (hereinafter referred to as a main body portion 13) and a sole portion 22, and is a type of head generally called an iron. The main body portion 13 has a face portion 20 and a hosel portion 24.

In the golf club head 12 of this embodiment, a face portion 20 is provided on the main body portion 13, and the face portion 20 is a face surface 20 a that hits a golf ball. A plurality of score lines extending in the toe direction from the heel are formed in parallel on the face surface 20a.
The golf club head 12 of this example has a loft angle θ of 25 ° or more. The loft angle θ will be described later in detail.

  The hosel portion 24 fixes the golf club shaft 14 to the golf club head 12 and is integrally provided on the heel side of the face portion 20. The hosel portion 24 is provided with an insertion hole 26 into which the golf club shaft 14 is inserted. In addition, a pin 26 is provided inside the insertion hole 26 so that the axis S coincides. The upper surface 28a of the pin 28 and the upper surface 24a of the hosel part 24 are flush with each other.

The meat portion 14a of the golf club shaft 14 is inserted into the gap between the pin 28 and the insertion hole 26, and the pin 28 is inserted into the cavity portion 14b. In the present embodiment, since the hosel portion 24 is short, a pin 28 is provided in the insertion hole 26 in order to ensure sufficient bonding strength.
In the present embodiment, the golf club shaft 14 is fixed to the golf club head 12 via a socket (not shown).

In the present embodiment, as shown in FIG. 3, the length of the pin 28 may be increased so that the upper surface 28 a of the pin 28 protrudes from the upper surface 24 a of the hosel portion 24. Thereby, the joining strength of the golf club shaft 14 can be further increased.
2 and 3, the inner edge of the opening of the insertion hole 26 is preferably chamfered, and the edge of the upper surface 28a of the pin 28 inserted into the golf club shaft 14 is also chamfered. preferable. By chamfering the insertion hole 26 and the pin 28, there is less room for load such as stress concentration on the golf club due to impact when the golf ball is hit, and the durability of the golf club 10 is further improved.

Further, in the present embodiment, for example, the face portion 20 having the face surface 20a for hitting a golf ball and the hosel portion 24 are integrally formed as the main body portion 13 by, for example, a high-strength aluminum alloy having a maximum tensile strength of 600 MPa or more. Is formed. This high-strength aluminum alloy can be obtained by a rapid solidification method in which a molten alloy is rapidly solidified. Specifically, a high-strength aluminum alloy has an amorphous phase, a mixed phase of amorphous and fine crystalline, by rapidly cooling a molten metal having an alloy composition containing a predetermined additive element, the main element being Al. Alternatively, it can be obtained by adjusting to a fine crystalline phase, and this high-strength aluminum alloy has high strength and superplasticity. For example, a rapidly solidified powder can be produced from molten metal by a gas atomizing method, and this powder can be extruded and solidified to produce a member such as a plate material of a high-strength aluminum alloy. Examples of the high-strength aluminum alloy include an alloy having a composition defined in Japanese Patent No. 3205495. Moreover, Nippon Light Metal Co., Ltd. make and MESO-10 (Al-9.5Zn-3Mg-1.5Cu-0.04Ag) are mentioned.
In addition, what constitutes the face portion 20 and the hosel portion 24 is not limited to a high-strength aluminum alloy, but has a high specific strength and has a strength that can withstand an impact caused by a golf ball. It is not particularly limited.

  As shown in FIG. 1, the golf club 10 has a shaft axis (not shown) of the golf club shaft 14 and an axis line of the golf club shaft 14 to the hosel portion 24 of the golf club head 12 through a socket (not shown). It is attached with S matched. The golf club shaft 14 has a grip 16 attached to the opposite side to which the golf club head 12 is attached.

Next, the dimension of each part of the golf club head 12 of this embodiment will be described.
4 (a) and 4 (b) are for explaining the definition of each part of the golf club head of the present embodiment, and FIG. 4 (a) is a front view for explaining the head height and the hosel height. FIG. 5B is a side view for explaining the face progression of the golf club. The loft angle θ (°) of the present invention is an angle formed by the axis S (shaft axis) and the face surface 20a, as shown in FIG. 4B.

  The head height H is set when the golf club head 12 is placed on the horizontal plane B so as to have a predetermined loft angle θ set on the golf club head 12, that is, the golf club head 12 is placed at a normal address position. 4A and 4B, the vertical height in the direction perpendicular to the horizontal plane B from the horizontal plane B to the highest point A located at the uppermost position of the golf club head 12.

  Further, the hosel height h is such that when the golf club head 12 is placed on the horizontal plane B so as to have a predetermined loft angle θ set on the golf club head 12, that is, the golf club head 12 is positioned at a normal address position. As shown in FIGS. 4A and 4B, the vertical height in the direction perpendicular to the horizontal plane B from the horizontal plane B to the joint where the golf club shaft 14 is joined in the hosel portion 24. It is.

  The joint to which the golf club shaft 14 is joined is a point on the axis S of the insertion hole 26 into which the golf club shaft 14 is inserted. For example, in the case of the hosel portion 24 shown in FIG. 2, since the golf club shaft 14 is joined by the pin 28, the point b through which the axis S on the upper surface 28a of the pin 28 passes becomes the reference point of the joined portion. The vertical height from the point b to the horizontal plane B is the hosel height h.

For example, as shown in FIG. 3, when the pin 28 protrudes from the insertion hole 26, a point b ₁ where the axis S on the upper surface 28 a of the pin 28 intersects becomes the reference point of the joint portion.
When the hosel part 24 is not provided with a pin or the like, a point where the axis S of the insertion hole 26 and a line flush with the upper surface 24a of the hosel part 24 intersect is a reference point.

Further, face progression F _P, as shown in FIG. 4 (b), when the golf club head 12, and arranged in a horizontal plane B so as to have a predetermined loft angle θ that is set to the golf club head 12, i.e. The golf club head 12 is a distance in a direction parallel to the axis S (shaft axis) of the insertion hole 26 and the frontmost position C of the face surface 20a and the horizontal plane B when the golf club head 12 is installed at a normal address position.

  Here, when the golf club 10 is installed at the normal address position, the golf club head 12 is installed at the lie angle, and the shaft axis S and the leading edge 13a of the golf club 10 are mutually connected as shown in FIG. It means to install in parallel. The installation according to the lie angle means that the clearance between the round of the sole portion 22 and the horizontal plane B in FIG. 4A is substantially equal on the toe side and the heel side. When the round of the sole portion 22 is unclear, a score line (not shown) drawn on the face surface 20a may be installed so as to be parallel to the horizontal plane B. When the round of the sole portion 22 is unclear and the parallel to the horizontal plane B cannot be determined because the score line is not linear, the lie angle is set to the lie angle (degrees) = (100−club length (inch)). Is set. For example, if the club length is 40 inches, the lie angle is 100−40 = 60 °.

Here, the club length is measured by a measuring method defined by the Japan Golf Equipment Association. An example of the measuring device is Club Major II manufactured by Kamoshita Seikosho Co., Ltd. That is, the distance between the heel side end and the grip end is defined as the club length.
At the address position, the direction of the leading edge 13a is set to a direction perpendicular to the direction indicated by the face surface 20a.

  Further, the loft angle θ of the golf club head 12 is measured by using a protractor standing perpendicular to the horizontal plane B so that the measurement surface is in contact with the face surface 20 a of the golf club head 12. It is measured by using a protractor standing perpendicular to the horizontal plane B of the face surface 20a of the golf club head 12. When the face surface 20a is a flat surface, the loft angle θ is obtained by the above measurement. However, when the face surface 20a is rounded in a convex shape, the measurement is performed with the protractor measurement surface in contact with the midpoint of the face surface 20a. Is done.

  As described above, the loft angle can be measured by inserting a shaft pin into a single golf club head as well as by using a golf club. The numerical value of the loft angle θ obtained by measuring with a single golf club head is substantially the same as the loft angle θ obtained by measuring with the above-described golf club.

  As described above, the measuring device for measuring the size of the golf club head and the measuring device for the loft angle θ, which is performed in a state where the direction of the face surface 20a is specified and the normal address position is set, are well-known ones on the market. For example, a Takatsuo ball head measuring table (manufactured by Shoho Co., Ltd.), a golf club angle measuring instrument (manufactured by Golf Garage), a golf club gauge (manufactured by Golfsmith), and the like are exemplified. Such a measuring device may be any known one, and is not particularly limited in the present invention.

In the golf club head 12 of the present invention, the ratio of the hosel height h to the head height H (h / H) is 0.7 or less with respect to the head height H (mm) and the hosel height h (mm). is there. Furthermore, the loft angle θ is preferably 25 ° or more and F _p is 5 mm or less.

  When the ratio (h / H) of the golf club head 12 is 0.7 or less, by utilizing the deformation of the golf club shaft, the launch angle is increased and the backspin amount is reduced without lowering the initial speed. can do. Furthermore, for the golfer, it is possible to obtain a soft feel that is judged to be good.

Next, since the ratio (h / H) of the golf club head 12 is 0.7 or less, the launch angle can be increased and the backspin amount can be decreased without reducing the initial speed. This will be described with reference to 6 (a) to (d).
Here, FIGS. 6A to 6D are schematic views for explaining the striking mechanism of the golf club of the present invention in the order of steps.

  First, as shown in FIG. 6A, the golf ball 40 collides with the gravity center position P of the face surface 20a of the face portion 20 at the time of impact. At this time, the striking force F acts on the gravity center position P of the face portion 20.

Next, as shown in FIG. 6 (b), the golf club head 12 is considered as a rigid body, and is hit by a line connecting the hitting position (center of gravity position P) and the joining portion 42 of the golf club shaft 14 and the sole portion 22. Find the force F component. A first component force F _D and a second component force F _u of the striking force F are obtained.

  Next, as shown in FIG. 6C, the force acting on the joint portion 42 between the golf club shaft 14 and the sole portion 22 is obtained. A rotational force Fr and a tensile force Ft act on the joint portion 42. The rotational force Fr is a force that rotates the golf club head 12 upward from the face portion 20. That is, it is a force that rotates the loft angle in a direction that increases. Further, the tensile force Ft is a force directed downward of the sole portion 22.

As shown in FIG. 6D, the golf club shaft 14 is deformed by the rotational moment R due to the rotational force Fr, the loft angle is increased, and the launch angle of the golf ball 40 is increased. Furthermore, a rotation r is applied to the golf ball 40 in the direction opposite to the back spin. As a result, the launch angle of the golf ball 40 increases and the backspin amount decreases. Further, since the hitting position of the golf ball 40 is the center of gravity position P, the initial speed is not reduced.
In this manner, when the ratio (h / H) of the golf club head 12 is 0.7 or less, the launch angle can be increased and the backspin amount can be decreased without decreasing the initial speed. Further, since the deformation of the golf club shaft 14 is used, a soft feel is obtained.

On the other hand, when the ratio (h / H) of the golf club head 12 exceeds 0.7, it is difficult to obtain the effect that the launch angle can be increased and the backspin amount can be reduced without decreasing the initial speed. . Hereinafter, the reason for this will be described in detail with reference to FIGS.
Here, FIGS. 7A to 7D are schematic views for explaining a conventional golf club striking mechanism in the order of steps.

  First, as shown in FIG. 7A, at the time of impact, the golf ball 40 collides with the gravity center position P of the face portion 20 (face surface 20a). At this time, the striking force F acts on the gravity center position P of the face portion 20.

Next, as shown in FIG. 7B, the golf club head 12 is considered a rigid body, and is hit with a line connecting the hitting position (center of gravity position P) and the joining portion 42 a of the golf club shaft 14 and the sole portion 22. Find the force F component. A first component force F _D and a second component force F _u of the striking force F are obtained.

  Next, as shown in FIG. 7C, the force acting on the joint portion 42 a between the golf club shaft 14 and the sole portion 22 is obtained. A rotational force Fr and a tensile force Ft act on the joint portion 42a. The rotational force Fr is a force that rotates the golf club head 12 from the face portion 20 to the sole portion 22. That is, it is the force that rotates the loft angle in the direction of decreasing. Further, the tensile force Ft is a force directed upward of the golf club head 12.

As shown in FIG. 7D, the golf club shaft 14 is deformed by the rotational moment _RD due to the rotational force Fr, the loft angle is reduced, and the launch angle of the golf ball 40 is reduced. Further, the golf ball 40, rotation r _b is applied in the same direction as the backspin. Thereby, the launch angle of the golf ball 40 is reduced and the backspin amount is not reduced.
Thus, when the ratio (h / H) of the golf club head 12 exceeds 0.7, it becomes difficult to increase the launch angle and further reduce the backspin amount.

The inventor produced golf clubs having different hosel heights and measured the launch angle. The result is shown in FIG. The head height H is 60 mm, the hosel height h is 60 mm (ratio: h / H = 1.0), and 20 mm (ratio: h / H = 0.33), and the face progression F _p is 0 mm. Three types of 5 mm and 12 mm were used.
FIG. 8 is a graph showing a change in launch angle depending on the hosel height, with the launch angle on the vertical axis and the face progression (F _p ) on the horizontal axis.

As shown in FIG. 8, the hosel height h is short, what the ratio (h / H) is in the range of the present invention, a high launch angle regardless of the face progression F _p. Thus, the launch angle can be increased by setting the ratio (h / H) of the golf club head 12 to 0.7 or less.

Next, the influence of the backspin amount of the size of the face progression F _p of the golf club head 12 will be described with reference to FIGS. 9 (a) and (b).
Here, FIG. 9A is a schematic diagram for explaining a striking mechanism when the face progression F _p of the golf club head is large, and FIG. 9B is a striking when the face progression F _p of the golf club head is small. It is a schematic diagram explaining a mechanism.

For face progression F _p is greater golf club head 12, similar to the striking mechanism shown in FIG. 6 (a) ~ (c) , by colliding a golf ball 40 to the center-of-gravity position P of the face surface 20a of the face portion 20, the analysis Then, the force acting on the joint portion 42 between the golf club shaft 14 and the sole portion 22 is obtained. As a result, as shown in FIG. 9A, the rotational force Fr and the tensile force Ft are acting. The rotational force Fr is a force that rotates the golf club head 12 upward from the face portion 20. That is, it is a force that rotates the loft angle in the direction of increasing. Further, the tensile force Ft is a force directed downward of the sole portion 22.
In face progression F _p is greater golf club head 12, the rotation r in a direction to reduce the amount of back spin to the golf ball 40 is added.

On the other hand, the face progression F _p is less golf club head 12, similar to the striking mechanism shown in FIG. 6 (a) ~ (c) , by colliding a golf ball 40 to the center-of-gravity position P of the face surface 20a of the face portion 20 The force acting on the joint portion 42 between the golf club shaft 14 and the sole portion 22 is obtained by analysis. As a result, as shown in FIG. 9B, the rotational force Fr and the tensile force Ft are acting. The rotational force Fr is a force that rotates the golf club head 12 from the face portion 20 to the sole portion 22. That is, it is a force that rotates the loft angle in a direction that decreases. Further, the tensile force Ft is a force directed upward of the face portion 20.
In face progression F _p is less golf club head 12, the rotation r _b is applied in the same direction as the back spin of the golf ball 40.
Thus, the size of the face progression F _p of the golf club head 12, changes the direction of the rotational force Fr acts, the direction of the rotational moment acting on the golf club head is changed, backspin amount changes.

The inventor manufactured golf clubs having different hosel heights and face progressions, and measured the backspin amount. The result is shown in FIG. The head height H is 60 mm, the hosel height h is 60 mm (ratio: h / H = 1.0), and 20 mm (ratio: h / H = 0.33), and the face progression F _p is 0 mm. Three types of 5 mm and 12 mm were used.
FIG. 10 is a graph showing changes in the backspin amount depending on the hosel height, with the backspin amount on the vertical axis and the face progression (F _p ) on the horizontal axis.

As shown in FIG. 10, shorter hosel height h, which ratio (h / H) is in the range of the present invention, the face progression F _p is in 5mm or less, backspin, those hosel height h is long It was almost the same level. Thus, by the face progression F _p and 5mm or less, it is possible to back spin on conventional and the same level.
As described above, in the present invention, the face progression F _{p is set} to 5 mm or less. If this face progression F _p exceeds 5mm tend to backspin amount is reduced, not have become a normal one the same level, there is a possibility that the stability of the flight distance is inferior.

In the golf club and golf club head of the present embodiment, the ratio (h / H) of the golf club head 12 is 0.7 or less, the loft angle θ is 25 ° or more, and _Fp is 5 mm or less. Thus, the launch angle can be increased and the backspin amount can be maintained without reducing the initial speed. Thereby, since the initial speed can be maintained and the launch angle can be increased, the flight distance does not decrease, and the backspin amount does not decrease, so that the flight distance stability can be improved. Further, since the deformation of the golf club shaft 14 is used, a soft feel is obtained.

Next, a second embodiment of the present invention will be described.
FIG. 11 is a schematic perspective view showing a golf club according to a second embodiment of the present invention, and FIG. 12 (a) is a partial sectional view of a hosel portion of the golf club head shown in FIG. b) is a schematic diagram showing a modified example of the pins used in the golf club head of the present embodiment.
The same components as those of the golf club head 12 of the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 11, the golf club head 50 of the golf club 10a of this embodiment has a configuration of the hosel portion 24a and a method of joining the golf club shaft 14 as compared to the golf club head 12 of the first embodiment. Unlike the other configuration, the configuration is the same as that of the golf club head 12 of the first embodiment, and a detailed description thereof will be omitted.

In the hosel portion 24a in the golf club head 50 of the present embodiment, the insertion hole 26a is a through hole, and the pin 28 of the hosel portion 24 of the golf club head 12 of the first embodiment is provided separately (FIG. 2).
The pin 52 is a cylinder having a flat front end surface 52a, and a rear end portion is formed on the inclined surface 52b according to the shape of the hosel portion 24a.
In the present embodiment, the golf club shaft 14 is inserted through the through hole 26a of the hosel portion 24a, and the pin 52 is inserted into the insertion hole 26a from the sole side. The pin 52 is inserted into the hollow portion 14 b of the golf club shaft 14. Thereby, the golf club shaft 14 is joined to the hosel portion 24a.

  The pin 52 is cylindrical, but the present invention is not limited to this. For example, as shown in FIG. 12B, the peripheral surface 52c may be a tapered pin 52a having a rear end diameter larger than the front end. Since the peripheral surface 52c of the pin 52a is tapered, the force for pressing the meat portion 14a of the golf club shaft 14 against the inner surface of the insertion hole 26a is increased, and the bonding strength of the golf club shaft 14 can be further increased. .

Moreover, when using the taper-shaped pin 52a, it is preferable that the front-end | tip part of a golf club shaft has a notch extended in a longitudinal direction (refer Fig.13 (a)). Thus, by providing a notch in the tip portion, the tip portion of the golf club shaft can be displaced in the diameter direction, and the meat portion 14a can be further pressed against the inner surface of the insertion hole 26a.
Further, in the present embodiment, the points b ₂ and b ₃ where the tip surfaces 54a of the pins 52a and 52a intersect the axis S are reference points for the hosel height h.

In the golf club head 50 of this embodiment, the ratio (h / H) between the hosel height h and the head height H is 0.7 or less, the loft angle θ is 25 ° or more, and the face progression F _p is also at 5mm or less, similar to the golf club head 12 of the first embodiment.

Also in the golf club head 50 of the present embodiment, the initial speed can be maintained and the launch angle can be increased similarly to the golf club head 12 and the golf club 10 of the first embodiment, so that the flight distance is reduced. In addition, since the amount of backspin is not reduced, the flight distance stability can be improved. Further, since the deformation of the golf club shaft 14 is used, a soft feel is obtained.
Also in the golf club head 50 of the present embodiment, it is preferable that the inner edge portion of the opening portion of the insertion hole 26a shown in FIGS. 12A and 12B is chamfered, and the golf club shaft 14 is also chamfered. It is preferable that the edge of the front end surface 54a of the pins 52 and 52a inserted into the chamfer is also chamfered. By chamfering the insertion hole 26a and the pins 52 and 52a, there is less room for a load such as stress concentration on the golf club 10a due to impact when the golf ball is hit, and the durability of the golf club 10a is further improved.

Next, a third embodiment of the present invention will be described.
FIG. 13A is a schematic partial cross-sectional plan view showing each component of the golf club according to the third embodiment of the present invention, and FIG. 13B shows the golf club head shown in FIG. FIG. 14C is a schematic partial cross-sectional plan view showing an assembled state of the golf club head shown in FIG. 13A, viewed from a direction perpendicular to the α-α line.
The same components as those of the golf club head 12 of the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIGS. 13A and 13B, the golf club head 50a of the golf club 10b of the present embodiment has a configuration of the hosel portion 24b and the golf as compared with the golf club head 12 of the first embodiment. The club shaft 70 is different in configuration and joining form, and the rest of the construction is the same as that of the golf club head 12 of the first embodiment, and therefore detailed description thereof is omitted.
Note that the meat portion 74a of the golf club shaft 70 shown in FIG. 13C corresponds to the meat portion 14a of the golf club shaft 14 (see FIG. 12A). A hollow portion 74b of the golf club shaft 70 shown in FIG. 13C corresponds to the hollow portion 14b of the golf club shaft 14 (see FIG. 12A).

As shown in FIGS. 13A and 13B, in the hosel portion 24b of the present embodiment, the insertion hole 60 is a through hole, and extends in a tapered shape with respect to the axis S direction.
In the insertion hole 60, the opening 62 on the side where the golf club shaft 70 is inserted is circular. Further, the opening 64 on the sole portion 22 side of the insertion hole 60 has a shape with a predetermined distribution rather than a uniform curvature. The opening 64 is larger in the area of the opening 62 of the insertion hole 60 and the area of the opening 64.

  In the present embodiment, the shape of the opening 62 of the insertion hole 60 is circular. However, the shape is not limited to this, and the shape of the opening 62 is non-circular such as an ellipse, an egg shape, or a polygon. It may be a shape. Furthermore, the shape of the opening 64 of the insertion hole 60 is also limited as long as the curvature is not uniform and has a predetermined distribution, that is, a non-circular shape such as an ellipse, an egg shape, or a polygon. is not.

  As shown in FIG. 13C, the golf club shaft 70 is inserted into the insertion hole 60, and a filler (diameter expanding means) 66 is filled into the hollow portion 74b of the golf club shaft 70 from the opening 64 of the sole portion 24b. Then, the golf club shaft 70 is joined to the hosel portion 24b. In this way, the bonding strength of the golf club shaft 70 may be further increased.

In the present embodiment, it is preferable to use a golf club shaft 70 shown in FIG. This golf club shaft 70 is provided with a plurality of cutouts 72 extending in the longitudinal direction of the golf club shaft 70 in the circumferential direction at the tip, and a section 74 that can be displaced in the diameter direction is formed.
In the golf club shaft 70 having such a configuration, the distal end portion of the golf club shaft 70 is expanded by the filler 66 so that the section 74 is in close contact with the inner surface of the insertion hole 60, and the bonding strength can be further increased.

In the case shown in FIG. 13C as well, the point b ₄ where the upper surface 66a of the filler 66 and the axis S intersect is the reference point for the hosel height h. When the filling material 66 is filled beyond the upper surface 24a of the hosel portion 24, the point where the upper surface 66a of the filling material 66 intersects the axis S is the reference point for the hosel height h.

  In the present invention, when the golf club shaft is made of metal or alloy, it may be welded to the hosel part. By welding and joining in this way, sufficient joint strength can be obtained.

  The golf club head and golf club of the present invention have been described above, but the present invention is not limited to the above-described embodiment, and various improvements or modifications may be made without departing from the gist of the present invention. Of course.

Hereinafter, examples of the golf club of the present invention will be specifically described in comparison with comparative examples that are out of the scope of the present invention.
In this embodiment, various golf club heads having the shapes shown in FIGS. 4A and 4B are produced by changing the hosel height and the face progression, and the same golf club shaft is combined to produce a golf club (Example 1). To 4 and Comparative Examples 1 to 4) were produced, and trial hits of these golf clubs were performed using a swing robot.

The golf club head ratio (h / H) and the face progression F _p (mm) in the golf clubs (the golf clubs of Examples 1 to 4 and Comparative Examples 1 to 4) are shown in FIGS. The hosel height h and the head height H were measured and calculated as shown in FIG.
Note that the loft angle θ (see FIG. 4B) of the golf club head is a protractor that stands perpendicular to the horizontal plane B (see FIG. 4B) when the face surface (see FIG. 4B) is a plane. (Not shown), and measured by placing the measurement surface in contact with the face surface of the golf club head (see FIG. 4B). In addition, when the face surface is rounded in a convex shape, the loft angle θ of the golf club head was measured with the protractor's measurement surface in contact with the midpoint of the face surface.
Further, all the head heights H of the golf club heads of Examples 1 to 4 and Comparative Examples 1 to 4 were set to 45 mm.

The golf club heads of Examples 1 to 4 and Comparative Examples 1 to 4 were tested using the initial ball speed, launch angle, backspin amount, and flight distance as evaluation items. The evaluation results for each item are shown in Table 1 below.
Further, in each test of this example, a TRX (trade name) ball manufactured by Yokohama Rubber Co., Ltd. was used as the golf ball unless otherwise specified.

  In the golf clubs of Examples 1 to 4 and Comparative Examples 1 to 4, a carbon fiber reinforced resin material was used for the golf club shaft and the club length was 35.5 inches. Each golf club head is an iron golf club head using an iron-based alloy (S20C) material.

  In the trial hits by the golf clubs of Examples 1 to 4 and Comparative Examples 1 to 4, the swing robot was hit with 10 golf balls at a time using the shot robot 4 manufactured by Miyamae Co., Ltd., and the initial ball speed, launch angle, and The backspin amount and flight distance were measured. The test hitting conditions were a head speed of 32 m / sec, and a golf ball hitting point position having a height of 20 mm and a center position of the face surface. Note that the height of the hitting point position was measured by placing the face surface on the horizontal plane B so that the loft angle was set, as with the head height H.

A measurement system 100 shown in FIG. 14A was used to measure the initial ball speed, launch angle, and backspin amount. The measurement system 100 includes a computer 102, a detection sensor 104 that detects the passage of the golf club head 120, a high-resolution camera 106 that collects images of the hit golf ball 110, and a golf ball 110 during imaging. And a strobe 108 that illuminates the golf ball 110. The computer 100 controls the entire system and calculates a ball initial speed, a launch angle, and a backspin amount based on a recorded image of the golf ball 110 recorded by the camera 106. The display device and the input device are Prepare. A transmission type laser sensor was used as the detection sensor 104. A CCD camera was used as the camera 106.
In the measurement system 100, the size of the recorded image of the golf ball 110 is calibrated so that the flight direction D of the golf ball 110 in the three-dimensional space can be calculated. As shown in FIG. 14B, the golf ball 110 is provided with marks 112a, 112b, and 112c in order to measure the pack spin amount.

Next, a method for measuring the initial ball speed, launch angle, and backspin amount in the measurement system 100 will be described.
First, the golf club head 120 was hit on the golf ball 110 at the head speed (32 m / sec) under the test hit conditions, and the golf ball 110 was allowed to fly in the flight direction D. At this time, the golf club head 120 is detected by the detection sensor 104, and a trigger signal is output to the computer 102.
Next, when receiving the trigger signal, the computer 102 causes the strobe 108 to emit light at regular intervals after a certain time. At this time, the shutter of the camera 106 is left open. Thereby, a measurement image 130 of the golf ball 110 subjected to multiple exposure as shown in FIG. 15 was obtained.

  Next, the backspin amount was calculated based on the rotation angle of the golf ball 110 and the light emission interval of the strobe 108 using the two golf ball images 114 a and 114 b recorded in the measurement image 130. Further, the center of gravity of the golf ball images 114a and 114b was obtained, and the initial ball speed and launch angle were calculated.

  Regarding the flight distance, the golf clubs of Examples 1 to 4 and Comparative Examples 1 to 4 were attached to a swing robot (Shiboto 4 manufactured by Miyamae Co., Ltd.), and 10 golf balls were shot at each golf club under the test hit conditions. The distance from the hit ball position to the landing position was measured, and the average value of the actually measured values was taken as the flight distance. The standard deviation of this flight distance was used. In addition, the standard deviation in the golf club of Example 1 is set as 100%, and evaluation is performed with a relative index. Therefore, the larger the relative index, the larger the standard deviation, indicating that the variation in flight distance is greater.

As shown in Table 1, Examples 1 to 4 are both a face progression _{F p} is 5mm or less, the ratio (h / H) is 0.7 or less, because loft angle is 25 ° or more The initial speed was maintained, the launch angle could be increased, the backspin amount was large, and the flight distance variation was small. A small variation in the flight distance means that the flight distance is highly stable.

On the other hand, Comparative Example 1, since the face progression F _p exceeds the 5 mm, compared loft angle is the same in Examples 1 to 3, less backspin amount was larger variation in distance.
In Comparative Example 2, the loft angle was 25 ° or less, and the backspin amount was small and the flight distance variation was large compared to Example 4 in which the loft angle was 25 °.
Comparative Example 3, the ratio (h / H) is above 0.7, as compared with Examples 1 and 2 loft angle and face progression F _p are the same, the launch angle is low, distance The variation was large.
In Comparative Example 4, the face progression F _p exceeds 5 mm, the ratio (h / H) exceeds 0.7, the loft angle is 25 ° or less, and the loft angle is 25 ° as compared to Example 4. The initial ball speed was low, the launch angle was low, the backspin amount was small, and the flight distance variation was large.

1 is a schematic perspective view showing a golf club according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a hosel part of the golf club head shown in FIG. 1. FIG. 6 is a schematic cross-sectional view showing a first modification of the hosel part of the golf club head shown in FIG. 1. (A) And (b) is for demonstrating the definition of each part of the golf club head of this embodiment, (a) is a front view for demonstrating head height and hosel height. (B) is a side view for demonstrating the face progression of a golf club. It is a schematic diagram for demonstrating the state which installs a golf club in an address position. (A)-(d) is a schematic diagram explaining the hitting mechanism of the golf club of this invention in order of a process. (A)-(d) is a schematic diagram explaining the hitting mechanism of the conventional golf club in order of a process. It is a graph which shows the change of the launch angle by the hosel height, with the launch angle on the vertical axis and the face progression (F _p ) on the horizontal axis. (A) is a schematic diagram illustrating the striking mechanism when the face progression F _p of the golf club head is large, (b) is a schematic for explaining a striking mechanism when the face progression F _p of the golf club head is less FIG. It is a graph which shows the change of the backspin amount by hosel height, taking the backspin amount on the vertical axis and taking the face progression (F _p ) on the horizontal axis. It is a typical perspective view which shows the golf club which concerns on the 2nd Embodiment of this invention. (A) is a fragmentary sectional view of the hosel part of the golf club head shown in FIG. 11, and (b) is a schematic view showing a modification of the pins used in the golf club head of the present embodiment. (A) is a typical fragmentary sectional top view which shows each structural member of the golf club which concerns on the 3rd Embodiment of this invention, (b) is a golf club head shown to FIG. FIG. 14C is a schematic partial cross-sectional plan view showing the assembled state of the golf club head shown in FIG. 13A. (A) is a schematic diagram which shows a measurement system, (b) is a schematic diagram which shows the golf ball used for a measurement system. It is a schematic diagram which shows the measurement image of the golf ball obtained by the measurement system.

Explanation of symbols

10, 10a, 10b Golf club 12, 50, 50a Golf club head 13 Golf club head body (head body)
13a Leading edge 14, 70 Golf club shaft 14b Hollow portion 16 Grip 20 Face portion 20a Face surface 22 Sole portion 24 Hosel portion 26, 26a, 60 Insertion holes 28, 52, 52a Pin 40 Golf ball 42 Joint portion 66 Filler B Horizontal surface S axis θ Loft angle

Claims (7)

A golf club head having a head body having a face surface for hitting a golf ball and a hosel portion having an insertion hole into which a golf club shaft is inserted, wherein the face surface is formed at a predetermined loft angle. ,
When the face surface is arranged on a horizontal plane so as to have the predetermined loft angle, a vertical height from the horizontal plane to the highest point of the crown portion of the head body is defined as a head height H (mm), and further, the face When the surface is arranged on a horizontal plane so as to have the predetermined loft angle, when the vertical height from the horizontal plane to the joint portion where the golf club shaft in the hosel portion is joined is the hosel height h (mm), The ratio (h / H) of the hosel height h to the head height H is 0.7 or less,
When the loft angle is 25 ° or more and the face surface is arranged on a horizontal plane so as to have the predetermined loft angle, the axis of the insertion hole, the foremost position of the face surface, and the horizontal plane A golf club head characterized in that, when the distance in the parallel direction is F _p , the F _p is 5 mm or less.   2. The golf club head according to claim 1, wherein the hosel portion is provided with a pin in the center of the insertion hole, and the pin is inserted into a hollow portion of a hollow golf club shaft.   The insertion hole of the hosel part penetrates to the sole part, and the opening on the sole part side of the insertion hole has a predetermined projection shape when projected onto a plane perpendicular to the axis of the insertion hole The golf club head according to claim 1, having a curvature distribution of:   A golf club comprising: the golf club head according to any one of claims 1 to 3; and a golf club shaft having a distal end portion inserted into and inserted into an insertion hole of the hosel portion.   5. The golf club according to claim 4, further comprising a diameter expanding means for expanding a diameter of the tip portion after the tip portion of the golf club shaft is inserted into the insertion hole of the hosel portion.   The golf club head according to claim 5, wherein the golf club shaft is provided with a notch extending in a longitudinal direction at the tip portion. The golf club according to claim 4, wherein the golf club head and the golf club shaft are joined by welding.

Images