JP2005137788A - Golf club head - Google Patents

Golf club head Download PDF

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JP2005137788A
JP2005137788A JP2003380218A JP2003380218A JP2005137788A JP 2005137788 A JP2005137788 A JP 2005137788A JP 2003380218 A JP2003380218 A JP 2003380218A JP 2003380218 A JP2003380218 A JP 2003380218A JP 2005137788 A JP2005137788 A JP 2005137788A
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portion
crown
sole
head
front
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JP2003380218A
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JP4373765B2 (en
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Yasushi Sugimoto
靖司 杉本
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Sumitomo Rubber Ind Ltd
住友ゴム工業株式会社
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Abstract

To increase a flight distance of a hit ball.
SOLUTION: A face portion 2 and a head main body portion 3 extending rearward from the back surface 2B of the face portion 2 are formed, and the head main body portion 3 forms a head upper portion, a head bottom portion, and a head side portion. A golf club head 1 having a hollow structure including a crown portion 4, a sole portion 5 and a side portion 6. The crown portion 4 includes a crown front portion 4a that forms a front region Lca from the back surface 2B to a position that is separated by a distance 0.15 times the crown depth length Lc, and a crown depth length Lc of 0.30 from the back surface 2B. And a crown rear portion 4b that forms a rear region Lcb that is at least double and that is 1.0 times. The crown front part 4a has a smaller rigidity than the crown rear part 4b.
[Selection] Figure 3

Description

  The present invention relates to a golf club head that can increase the flight distance of a hit ball.

  In order to increase the flight distance of the hit ball, various improvements have been proposed for the face portion of the golf club head. Specifically, a so-called peripheral thin-walled structure in which the thickness of the peripheral portion of the face portion is reduced, or a material having a high strength and a low elastic modulus for the face portion can be used. Thereby, the coefficient of restitution of the face portion is increased, and the initial launching speed of the ball is increased. However, there is a limit to the increase in the coefficient of restitution only by improving the face part.

  In recent years, in wood-type golf club heads, attempts have been made to increase the flight distance by reducing the rigidity of the crown portion to greatly deflect the crown portion at the time of hitting and increasing the ball launch angle (the following patents). Reference 1)

JP 2003-88601 A

  However, in the above proposal, the entire crown portion is greatly deformed at the time of hitting. For this reason, much of the kinetic energy of the head is consumed to deform the crown portion over a wide range, and the energy loss is large and the spring effect itself is small. That is, in the above proposal, although the launch angle can be increased, it is difficult to maintain a large coefficient of restitution.

  The present invention has been devised in view of the above situation, and a crown portion in a head main body portion that is continuous with the back surface of the face portion and extends rearward of the head is provided on the front crown portion on the face portion side and behind the crown portion. And a golf club head that can improve not only the ball launch angle but also the coefficient of restitution, based on the fact that the crown front portion has a lower rigidity than the crown rear portion. Yes.

  The invention according to claim 1 of the present invention has a face portion having a face surface for hitting a ball, and a head main body portion extending to the back of the head connected to the back surface of the face portion, and the head main body portion includes: A golf club head having a hollow structure including a crown portion, a sole portion, and a side portion forming a head top portion, a head bottom portion, and a head side portion, respectively, wherein the crown portion has a crown depth length Lc of 0.15 from the back surface. A crown front portion forming a front region up to a position separated by a double distance, and a crown rear portion forming a rear region not less than 0.30 times and 1.0 times the crown depth length Lc from the back surface, The front part has a smaller rigidity than that of the rear part of the crown.

  In the invention according to claim 2, the sole portion includes a sole front portion that forms a front region from the back surface to a position that is separated by a distance 0.15 times the sole depth length Ls, and the sole depth length from the back surface. 2. The golf according to claim 1, further comprising: a rear portion of the sole that forms a rear region that is 0.30 times or more and 1.0 times of Ls, and the front portion of the sole has rigidity smaller than that of the rear portion of the sole. Club head.

  According to a third aspect of the invention, in the golf according to claim 1 or 2, the crown portion has an average thickness tc1 of the crown front portion smaller than an average thickness tc2 of the crown rear portion. Club head.

  According to a fourth aspect of the present invention, the crown rear portion is provided with one or a plurality of protruding crown ribs extending in the front-rear direction of the head on the inner surface side, and the crown front portion is not provided with the crown rib. The golf club head according to claim 1, wherein:

  The invention according to claim 5 has a face portion having a face surface for hitting a ball, and a head main body portion extending to the back of the head and extending to the back of the face portion, and the head main body portion includes an upper portion of the head, A golf club head having a hollow structure including a crown portion, a sole portion, and a side portion forming a head bottom portion and a head side portion, respectively, wherein the sole portion is a distance of 0.15 times the sole depth length Ls from the back surface. A sole front portion that forms a front region up to a position that separates the sole, and a sole rear portion that forms a rear region that is 0.30 times and 1.0 times the sole depth length Ls from the back surface, and the sole front portion Is a golf club head having rigidity smaller than that of the rear portion of the sole.

  According to a sixth aspect of the present invention, in the golf club head according to the fifth aspect, the sole portion has an average thickness ts1 of the front portion of the sole that is smaller than an average thickness ts2 of the rear portion of the sole. It is.

  According to a seventh aspect of the present invention, the sole rear portion is provided with one or more protruding sole ribs extending in the front-rear direction of the head on the inner surface side, and the sole front portion is not provided with the sole rib. The golf club head according to claim 5, wherein the golf club head is a golf club head.

  Since the golf club head of the present invention has a crown front portion with low rigidity on the face side of the crown portion, this portion can be bent by being elastically deformed greatly at the time of hitting. As a result, the apparent loft angle of the face portion can be increased and the ball launch angle can be increased. Further, since a crown rear portion having high rigidity is provided behind the crown front portion, elastic deformation of the crown portion at the time of hitting can be limited to a small range of the crown front portion. As a result, the energy loss is small, the spring effect accompanying the restoration of the bending of the crown front portion is efficiently generated, and an improvement in the coefficient of restitution can be expected. As described above, the golf club head of the present invention can improve both the launch angle and the coefficient of restitution, and increase the flight distance of the hit ball.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 is an overall perspective view of a reference state of a golf club head showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. It is an enlarged view. Here, the reference state refers to a vertical axis VP of a shaft axis line of a golf club head (hereinafter, simply referred to as “head”) 1 (a shaft center line CL of a shaft insertion hole 7a described later). The projection normal obtained by projecting the normal line N drawn from the head center of gravity G to the face surface F onto the horizontal plane HP is inclined to the horizontal plane HP by being arranged at a lie angle determined on the head 1 and grounded to the horizontal plane HP. A state perpendicular to VP is defined as a state. Any head can be set to the above-described position by rotating the head 1 around the shaft axis while keeping the shaft axis at the lie angle.

  The head 1 of the present embodiment includes a face portion 2 having a face surface F for hitting a ball, and a head main body portion 3 that extends to the back of the head and extends to the back surface 2B of the face portion 2. The head 1 of this embodiment is exemplified by a wood type made of a metal material, and a hollow structure with a hollow portion i provided therein is shown.

  The face portion 2 is an outer surface of the face portion 2 and has a face surface F for hitting a ball and a back surface 2B which is an opposite surface. Although the thickness of the face portion 2 is substantially constant in the present embodiment, it is needless to say that a thin peripheral structure with a thin peripheral portion may be adopted. The face surface F may be provided with grooves (not shown) such as face lines. As shown in FIG. 4, the back surface 2B of the face portion 2 includes a main back surface 2B1 facing the hollow portion i of the head and a peripheral back surface 2B2 virtually set as extending vertically from the outer edge Pa of the main back surface 2B1. And And the head main-body part 3 is continued to this peripheral back surface 2B2, and has extended back of the head.

  The head main body 3 includes a crown part 4, a sole part 5, and a side part 6 that respectively form a head upper part, a head bottom part, and a head side part, and a neck part 7 is provided on the heel side of the crown part 4. . The neck portion 7 is formed with a cylindrical shaft insertion hole 7a into which a shaft (not shown) is inserted. Since the shaft center line CL of the shaft insertion hole 7a substantially coincides with the shaft axis line, the shaft axis line can be substituted when the lie angle is set. The face portion 2 and the head main body portion 3 may be integrally joined in advance by casting or the like, or may be joined by welding or the like.

  As shown in FIG. 3, the head 1 according to the present embodiment forms a front region Lca from the back surface 2 </ b> B of the face portion 2 to a position at a distance of 0.15 times the crown depth length Lc. A crown front portion 4a and a crown rear portion that forms a rear region Lcb of 0.30 times and 1.0 times the crown depth length Lc from the back surface 2B, and the crown front portion 4a is more than the crown rear portion 4b. It has a small rigidity (flexural rigidity EI). Here, the crown depth length L is the rear end of the outer edge Pa of the back surface 2B of the face portion 2 on the crown portion side and from the position closest to the face surface to the back face side of the crown portion 4 in the hollow portion i. It is a distance to the edge Pb and is measured in a direction parallel to the normal line N in the reference state.

  As shown in FIG. 5, when a ball is hit, bending moments Mf and Mr act on the crown front portion 4a and the crown rear portion 4b, respectively, and each portion is elastically deformed according to the bending rigidity ( Deflection) occurs. Since the bending stiffness represents the resistance against this bending, the crown front portion 4a is bent more greatly than the crown rear portion 4b. Therefore, as shown in FIG. 6, the face surface F can be tilted backward at a small angle δ, and the apparent loft angle can be increased, thereby increasing the ball launch angle. This effectively increases the flight distance for golfers who are not good at raising the ball high. Thus, in order to increase the apparent loft angle at the time of hitting, it is not necessary to greatly bend the entire crown portion 4.

  Further, since the crown rear portion 4b having high rigidity is provided behind the crown front portion 4a, elastic deformation of the crown portion at the time of hitting is concentrated in a small range of the crown front portion. This reduces the energy loss by reducing the deformation range, and more strongly acts on the ball with the spring effect accompanying the restoration of the elastic deflection accumulated in the crown front portion 4a. Therefore, the coefficient of restitution can be improved. Thus, the golf club head of the present invention has a remarkable effect that both the launch angle and the coefficient of restitution can be improved.

  Here, the bending rigidity EI is determined by the product of the Young's modulus of the material and the cross-sectional secondary moment I. In this specification, when the Young's modulus of the crown front part 4a and the crown rear part 4b is the same, the average thicknesses tc1 and tc2 are compared as a simple method to determine the size. On the other hand, when the Young's modulus is different between the crown front part 4a and the crown rear part 4b, the magnitude is determined by a value obtained by multiplying the Young's modulus by the cube of the average thickness.

In the head 1 of this embodiment, the inner surface and the outer surface of the crown portion 4 are continuous with a smooth surface, and the entire region is formed of the same metal material. For this reason, in order to make the crown front part 4a have a bending rigidity smaller than that of the crown rear part 4b, an example is shown in which the average thickness tc1 of the crown front part 4a is smaller than the average thickness tc2 of the crown rear part 4b.

  The average thickness tc1 of the crown front portion 4a is not particularly limited, but is preferably 0.5 mm or more, more preferably 0.6 mm or more. If the average thickness tc1 is less than 0.5 mm, the strength of the crown front portion 4a is insufficient and the durability tends to be impaired. On the other hand, even if the average thickness tc1 is too large, it tends to be difficult to largely deflect the crown front portion 4a at the time of hitting. The average thickness tc1 is preferably 2.0 mm or less, more preferably 1.2 mm or less, in combination with any of the lower limit values. The crown front portion 4a of the present embodiment is exemplified by one formed with a substantially constant thickness.

  By the way, the neck portion 7 is formed to have a large thickness including its peripheral portion in order to obtain a required strength, but this portion hardly contributes to the repulsion of the head. In this specification, it is assumed that the neck portion 7 is not included in the crown front portion 4a. Specifically, a portion included in the cylindrical region X having a radius of 20 mm centered on the axial center line CL of the shaft insertion hole 7a is not included in the crown front portion 4a.

  The average thickness tc2 of the crown rear portion 4b is not particularly limited, but is preferably 0.7 mm or more, more preferably 1.0 mm or more. When the average thickness tc2 is less than 0.7 mm, the rigidity of the crown rear portion 4b is lowered. Therefore, the crown rear portion 4b is also greatly deformed at the time of hitting the ball, and as a result, energy loss tends to be increased and the resilience performance tends to be lowered. Conversely, even if the average thickness tc2 is too large, the resilience performance tends to deteriorate. Preferably, the average thickness tc2 is preferably 3.0 mm or less, more preferably 2.5 mm or less in combination with any of the lower limit values. The crown rear portion 4b of the present embodiment is exemplified by one formed with a substantially constant thickness.

  The ratio (tc2 / tc1) between the average thickness tc1 of the crown front part 4a and the average thickness tc2 of the crown rear part 4b is preferably 1.2 or more, more preferably 1.5 or more. If the ratio (tc2 / tc1) is less than 1.2, the rigidity of the crown front part 4a and the crown rear part 4b approach each other, so that the deformation of the crown part 4 at the time of hitting a ball is wide or reverse. There is a tendency that the deformation becomes smaller. On the other hand, even if the ratio (tc2 / tc1) is too large, the rigidity of the crown front part 4a is excessively lowered to impair the durability, and conversely, the rigidity of the crown rear part 4b is excessively increased to repel. There is a tendency to reduce performance. From such a viewpoint, the upper limit of the ratio (tc2 / tc1) is preferably 5.0 or less, more preferably 3.0 or less in combination with any of the lower limit values.

In addition, the measuring method of each average thickness shall weight and measure with an area. That is, for example, when the average thickness tc1 of the crown front portion 4a is taken as an example, it can be calculated by the following formula.
tc1 = Σ (tc1 i · S i ) / ΣS i (i = 1, 2,...)
Here, tc1i is the actual thickness of an arbitrary minute area a i at the front of the crown, and S i is the area occupied by the minute area a i .

  Further, it is known that the frequency f indicating the first-order minimum value of the frequency transfer function of the head 1 is generally inversely correlated with the coefficient of restitution. That is, the restitution coefficient of a head with a reduced frequency f increases. This is also called impedance matching theory. The head of this embodiment can be easily set to a preferable range of the frequency f, specifically, 700 to 1200 Hz.

A crown intermediate portion 4c is provided in an intermediate region Lcc between the crown front portion 4a and the crown rear portion 4b. The crown intermediate part 4c may have the same rigidity as the crown front part 4a or the same rigidity as the crown rear part 4b. When the average thickness of the crown intermediate portion 4c is tc3, the following relationship can be satisfied.
tc1 <tc2 and tc1 ≦ tc3 ≦ tc2

  The crown intermediate portion 4c of the present embodiment is connected to the crown front portion 4a and is connected to the front portion 4c1 extending at substantially the same thickness tc1 and the crown rear portion 4b and substantially the same as this. The rear portion 4c2 extends at a thickness tc2 and a tapered joint portion 4c3 whose thickness gradually increases from the front portion 4c1 to the rear portion 4c2. Such a crown intermediate portion is preferable in that a large rigidity step is prevented from being formed on the crown portion 4 and the stress concentration at the time of hitting can be alleviated. In this example, the relationship of tc1 <tc3 <tc2 is satisfied. However, the configuration of the crown intermediate portion 4c is not limited to such a shape.

  Further, the crown front part 4a having low rigidity needs to be formed in the front region Lca having a length 0.15 times the crown depth length Lc from the back surface 2B of the face part 2. When the crown front portion 4a is a region having a length less than 0.15 times the crown depth length Lc, the crown portion 4 cannot be sufficiently deformed at the time of hitting the ball, and the launch angle cannot be improved. It is disadvantageous for improving the distance. On the other hand, the crown front portion 4a can be extended from the back surface 2B of the face portion 2 to a range smaller than 0.30 times the crown depth length Lc.

  Further, the head 1 of this embodiment includes a sole front portion 5a that forms a front region Lsa from the back surface 2B of the face portion 2 to a position that is 0.15 times the sole depth length Ls, and the above-described sole portion 5a. And a sole rear portion 5b that forms a rear region Lsb that is 0.30 times or more and 1.0 times the sole depth length Ls from the back surface 2B, and the sole front portion 5b has rigidity smaller than that of the sole rear portion 5b. Indicated.

  In general, when the ball is hit above the sweet spot SS of the face surface F (the point where the normal N drawn from the head center of gravity G to the face surface F intersects the face surface F), the crown front portion 4a is The flying distance can be improved by more effectively deflecting and improving the spring effect or launch angle. On the other hand, when the ball is hit at a position substantially below the sweet spot SS on the face surface F, there is a case where sufficient deflection of the crown front portion 4a cannot be obtained.

  In the present embodiment, since the sole portion 5 includes the sole front portion 5a having a small rigidity and the sole rear portion 5b having a rigidity higher than the sole portion 5, when the ball is hit below the sweet spot SS, As shown in FIG. 7, the ball launch angle can be made small by apparently reducing the loft angle at a small angle β by effectively bending the sole front part 5a by elastic deformation. Usually, when the ball is hit below the sweet spot SS, the backspin amount of the ball is increased due to the gear effect, and the ball tends to be blown up and the flight distance is lost. By reducing the upper loft angle, it is possible to prevent the hitting of the hit ball and minimize the decrease in the flight distance.

  The average thickness ts1 of the sole front portion 5a is not particularly limited, but is preferably 0.8 mm or more, more preferably 1.0 mm or more. If the average thickness ts1 is less than 0.8 mm, the strength of the sole front portion 4a is insufficient and the durability tends to be impaired. On the other hand, even if the average thickness ts1 is too large, it tends to be difficult to largely deflect the sole front portion 5a when hitting a ball. From such a viewpoint, the average thickness ts1 is preferably 2.0 mm or less, more preferably 1.5 mm or less, in combination with any one of the lower limit values. The sole front portion 5a of the present embodiment is exemplified by a substantially constant thickness.

  The average thickness ts2 of the sole rear portion 5b is not particularly limited, but is preferably 1.0 mm or more, more preferably 1.2 mm or more. When the average thickness ts2 is less than 1.0 mm, the rigidity of the sole rear portion 5b is lowered. Therefore, the amount of bending of the sole rear portion 5b is excessively large at the time of hitting, and the energy loss is increased and the resilience performance is likely to be lowered. Conversely, even if the average thickness ts2 is too large, the resilience performance tends to deteriorate. From such a viewpoint, the average thickness ts2 is preferably 2.5 mm or less, more preferably 2.0 mm or less, in combination with any one of the lower limit values. In addition, what was formed in the sole rear part 5b of this embodiment by substantially constant thickness is illustrated. The method for measuring the rigidity and each average thickness is as described above.

  Further, as shown in FIG. 8A, the sole portion 5 may be formed with a substantially constant thickness, and only the crown portion 4 may be provided with a change in rigidity of the front portion 4a and the rear portion 4b. As in (B), the crown portion 4 may be formed with a substantially constant thickness, and only the sole portion 5 may be provided with the front portion 5a and the rear portion 5b.

  9 to 11 show still another embodiment of the present invention. FIG. 9 is an exploded perspective view of the head, FIG. 10 is a plan view of the reference state of the head, and FIG. B sectional drawing and the figure (B) are CC sectional views of Drawing 11 (A).

  In the head 1 of this embodiment, in order to make the rigidity of the crown front part 4a smaller than the rigidity of the crown rear part 4b, one or a plurality (in this example, a plurality of parts) extends in the head longitudinal direction on the inner surface side of the crown rear part 4b. ) In which the projecting crown rib 11 is projected. Such a crown rib 11 is not provided in the crown front portion 4a. In the present embodiment, the crown portion 4 other than the portion where the crown rib 11 is provided is formed with a substantially constant thickness tc. Thereby, the rigidity of the crown front part 4a in which the crown rib 11 is not provided is smaller than the rigidity of the crown rear part 4b.

  As shown in FIGS. 11A and 11B, the crown rib 11 protrudes toward the hollow portion i and extends in the ridge direction in the front-rear direction of the head 1. The crown rib 11 can be formed integrally with the crown rear portion 4b in advance by casting or the like, or can be integrally provided on the inner surface of the crown rear portion 4 by retrofitting with an adhesive, welding, brazing, or the like. In this embodiment, the cross-sectional shape of the crown rib 11 is a semicircular shape, but various cross-sectional shapes can be adopted depending on a rectangular shape, a triangular shape, an elliptical shape, a combination thereof, or the like. Further, the head longitudinal direction in which the crown rib 11 extends may not be strict, and for example, in the reference state, a straight line connecting both ends of the rib projected onto the horizontal plane HP is 30 degrees with respect to the projection normal. Broadly includes:

  The protrusion height h of the crown rib 11 shown in FIG. 11B is not particularly limited, but is preferably 0.5 mm or more, more preferably 0.6 mm or more. If the protruding height h is less than 0.5 mm, it tends to be difficult to increase the rigidity of the crown rear portion 4b, and the entire crown portion 4 may be greatly bent at the time of hitting. On the contrary, even if the protrusion height h of the crown rib 11 is too large, the weight of the crown rear portion 4b becomes excessively large, and this tends to increase the position of the head gravity center G. From such a viewpoint, the upper limit of the protrusion height h of the crown rib 11 is 3.0 mm or less, more preferably 1.5 mm or less in combination with any one of the lower limit values. This height h may be constant or may vary.

  The width W of the crown rib 11 is not particularly limited, but is preferably 0.7 mm or more, more preferably 1.0 mm or more. If the width W is less than 0.7 mm, it tends to be difficult to increase the rigidity of the crown rear portion 4b, and the entire crown portion 4 may be greatly bent at the time of hitting. On the contrary, even if the width W of the crown rib 11 is too large, the weight of the crown rear portion 4b becomes excessively large, and this tends to increase the position of the center of gravity G of the head. From such a viewpoint, the upper limit of the width W of the crown rib 11 is 3.0 mm or less, more preferably 2.0 mm or less, in combination with any one of the lower limit values.

Further, from the same viewpoint as described above, the cross-sectional area S of the crown rib 11 is preferably 0.2 mm 2 or more, more preferably 0.5 mm 2 or more. For the same upper limit, in combination with any of the above lower limit values It is desirably 4.0 mm 2 or less, more preferably 2.0 mm 2 or less. Further, in the plurality of crown ribs 11, the distance d between the adjacent crown ribs 11, 11 is preferably 5 mm or more, more preferably 7 mm or more, and the upper limit is 30 mm or less in combination with any one of the lower limit values. More preferably, it is 20 mm or less.

  In addition, the thickness tc of the crown portion 4 other than the crown rib 11 is, for example, 0.5 mm or more, more preferably 0.7 mm or more, and 2.0 mm or less, more preferably 1.5 mm or less. desirable. If it is 2.0 mm or more, the rigidity of the crown front portion 4a tends to be excessively increased. Conversely, if it is less than 0.5 mm, the strength of the crown portion 4 tends to be insufficient and durability tends to be poor.

  In this embodiment, similarly to the crown portion 4, in order to make the rigidity of the sole front portion 4a smaller than the rigidity of the sole rear portion 5b, one or a plurality (in this example) extends in the front-rear direction of the head on the inner surface side of the sole rear portion 5b. Fig. 5 shows a structure in which a plurality of protruding sole ribs 12 are provided. The portion of the sole portion 5 other than the sole rib 12 is formed with a substantially constant thickness, and no sole rib 12 is provided on the sole front portion 5a. Therefore, the rigidity of the sole front part 5a where the sole rib 12 is not provided is smaller than the rigidity of the sole rear part 5b. The same rules as the crown rib 11 can be applied to the sole rib 12.

The head 1 of the present embodiment can be formed of various materials such as titanium alloy, stainless steel, aluminum alloy, and the manufacturing method is not particularly limited. Further, in order to obtain a more effective distance increase effect, the head volume 300 cm 3 or more, more preferably particularly desirable that the 320 cm 3 or more.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, the thickness is gradually increased from the crown front portion 4a toward the crown rear portion 4b, the crown front portion 4a and the rear portion 4b are made of different materials, and the crown rear portion 4b has a length like a rib. It is also possible to intermittently provide no protrusions.

Based on the specifications in Table 1, a wood-type golf club head (# 1) having a head volume of 400 cm 3 , a head mass of 200 g, and a real loft angle of 10 degrees was prototyped, and various tests were performed to compare the performance. For the face part, a rolled material of DAT55G (Ti-15V-6Cr-4Al) was used, and the thickness was made uniform. In addition, a casting of Ti-6Al-4V was used for the head body, and it was integrated with the face member by welding.
The test method is as follows.

<Restitution coefficient>
U. S. G. A. The test ball was based on the following four types of test balls, although it was based on the Procedure for Measureing the Velocity Ratio of a Club Head for Conformance to Rule 4-1e, Revision 2 (February 8, 1999). The larger the value, the better.
1. XXIO: manufactured by SRI Sports (manufactured in 2003)
2. HI-BRID EVERIO: manufactured by SRI Sports (manufactured in 2003)
3. XXIO: manufactured by Sumitomo Rubber Industries, Ltd. (produced in 2001)
4). DDH XAMXA LADIES: manufactured by SRI Sports (manufactured in 2003)

<Machine test>
A wood-type golf club having a total length of 45 inches was manufactured by mounting the same carbon resin shaft (MP-200 manufactured by SRI Sports, manufactured in 2003) on each test head. Each of the test clubs was attached to a swing robot, and the above four types of golf balls were hit with 10 sweet balls each at a head speed of 45 m / s, and the flight distance (carry + run) and the backspin amount were measured. All evaluations are shown as average values.

<Frequency showing the first-order minimum value of the head frequency transfer function>
Measure by vibration method. The specific procedure is as follows.
(1) As shown in FIGS. 12 and 13, the vibration member 12 (cylindrical shape having an outer diameter of 10 mm) of the vibration exciter 13 is fixed to the sweet spot SS on the face surface F of the head 1 with an adhesive.
(2) As shown in FIG. 13, the acceleration pickup Pa2 is fixed with an adhesive at a position 20 mm from the sweet spot SS on the face surface F where the vibration of the head 1 can be measured to the toe side.
(3) As shown in FIG. 12, an acceleration pickup Pa <b> 1 that measures the acceleration at the excitation point when the vibrator 13 vibrates the head is attached to the input jig 15.
(4) As shown in FIG. 14, the vibration is applied to the head 1 by the vibrator 13, and the signal of the acceleration α1 of the input jig 15 and the signal of the acceleration α2 on the head 1 side are taken into the FFT analyzer via the power unit.
(5) The frequency transfer function is obtained by (a power spectrum of α1 / power spectrum of α2) with an FFT analyzer.
(6) FIG. 15 shows the measurement result of the frequency transfer function. From this graph, the frequency f (the lowest frequency among the frequencies indicating a plurality of minimum values) indicating the first-order minimum value of the frequency transfer function of the head measured by the vibration method with the head fixed to the shaker. Read. Table 1 shows the test results.

  As a result of the test, it can be confirmed that the head of the example significantly increased the flight distance compared to the head of the comparative example. This result is played regardless of the type of golf ball. Further, since the backspin amount is stable with respect to various balls (variation is 300 rpm or less), the flying height of the hit ball is almost constant, and a stable flight distance can be obtained.

1 is an overall perspective view of a golf club head of an embodiment. FIG. It is the AA end elevation. It is the Y section enlarged view of FIG. It is a perspective view of a head. It is a side view which shows the state at the time of hitting of a head. It is a side view which shows the state at the time of hitting of a head. (A), (B) is sectional drawing of the head which shows other embodiment of this invention. It is a disassembled perspective view of the head which shows other embodiment of this invention. FIG. (A) is the sectional view, and (B) is the CC sectional view. It is a side view explaining the measuring method of an excitation method. It is a front view of a face surface. It is a whole block diagram explaining an excitation method. It is a graph which shows a frequency transfer function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Golf club head 2 Face part 3 Head main-body part 4 Crown part 4a Crown front part 4b Crown rear part 5 Sole part 5a Sole front part 5b Sole rear part 6 Side part 7 Crown rib 8 Sole rib Lc Crown depth length Lca The front area | region of a crown part Lcb Crown area rear area Ls Sole depth length Lsa Sole area front area Lsb Sole area rear area

Claims (7)

  1. A face portion having a face surface for hitting a ball, and a head main body portion extending to the back of the head connected to the back surface of the face portion;
    And the head body is a golf club head having a hollow structure including a crown part, a sole part and a side part that respectively form a head upper part, a head bottom part and a head side part,
    The crown portion includes a crown front portion that forms a front region from the back surface to a position that is separated by a distance 0.15 times the crown depth length Lc, and 0.30 times the crown depth length Lc from the back surface and 1 A golf club head comprising: a crown rear portion forming a rear region of 0.0 times, and the crown front portion having a rigidity smaller than that of the crown rear portion.
  2.   The sole portion includes a sole front portion that forms a front region from the back surface to a position that is separated by a distance 0.15 times the sole depth length Ls, and 0.30 times the sole depth length Ls from the back surface, and 1 The golf club head according to claim 1, further comprising: a rear portion of the sole that forms a rear region of 0.0 times, and the front portion of the sole has rigidity smaller than that of the rear portion of the sole.
  3.   3. The golf club head according to claim 1, wherein the crown portion has an average thickness tc <b> 1 of the crown front portion smaller than an average thickness tc <b> 2 of the crown rear portion.
  4.   2. The crown rear portion is provided with one or more projecting crown ribs extending in the front-rear direction of the head on the inner surface thereof, and the crown front portion is not provided with the crown rib. Golf club head.
  5. A face portion having a face surface for hitting a ball, and a head main body portion extending to the back of the head connected to the back surface of the face portion;
    And the head body is a golf club head having a hollow structure including a crown part, a sole part and a side part that respectively form a head upper part, a head bottom part and a head side part,
    The sole portion includes a sole front portion that forms a front region from the back surface to a position that is separated by a distance of 0.15 times the sole depth length Ls, and 0.30 times or more of the sole depth length Ls from the back surface and 1 A rear portion of the sole that forms a rear region of 0.times.
    The golf club head is characterized in that the front portion of the sole has a rigidity smaller than that of the rear portion of the sole.
  6.   6. The golf club head according to claim 5, wherein the sole portion has an average thickness ts1 of the front portion of the sole that is smaller than an average thickness ts2 of the rear portion of the sole.
  7.   6. The sole rear portion is provided with one or more protruding sole ribs extending in the front-rear direction of the head on an inner surface side thereof, and the sole front portion is not provided with the sole rib. Golf club head.
JP2003380218A 2003-11-10 2003-11-10 Golf club head Active JP4373765B2 (en)

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