JP5374956B2 - Golf club head - Google Patents

Description

  The present invention relates to a golf club head, and more particularly, to a golf club head that improves the hitting sound while further improving the flight distance of the hitting ball by a golf club head having a concave crown surface.

  In order to improve the flight distance of a golf ball hit by a golf club, the initial velocity of the golf ball at the time of hitting is increased (higher initial velocity), the launch angle is increased (higher hitting angle), and It is known that the three conditions of keeping the reverse rotation amount (back spin) of a golf ball low (lowering spin) must be satisfied. Of these, the high initial speed largely depends on the physical strength and skill of the player, but the high striking angle and low spin can be improved by devising the structure of the golf club head. Various improvements of the golf club head have been proposed.

  As one of such improvement means, Patent Document 1 discloses that a concave portion recessed toward the sole side is formed near the center of the crown portion of the head, thereby reducing the center of gravity of the golf club head and increasing the hitting angle. It is proposed to reduce the spin rate.

However, although the above golf club head contributes to the improvement of the flight distance of the hit ball, it has a characteristic that the hitting sound is low (less than 3000 Hz) and the sound volume is high (over 100 phones), which is inconvenient for the player. There was a problem of giving pleasure.
Japanese Patent Laid-Open No. 11-19253

  An object of the present invention is to provide a golf club head capable of increasing the hitting sound and reducing the volume while further improving the hitting distance improvement effect of the golf club head having a concave crown surface. It is in.

The golf club head of the present invention that achieves the above object has a hollow head body (4 ) in which a crown portion (2) is connected to the upper edge side of the face portion (1) and a sole portion (3) is connected to the lower edge side. In the golf club head in which the shaft insertion hole (6) is provided on the heel (5) side of the crown portion (2) and the concave portion (8) having a convex curved surface inward is formed in the central region. In a state where the head body (4) is normally grounded with respect to the reference plane (X), the lowest surface (9) of the recess (8) is formed so as to be located in the central area of the crown portion (2) , said head body (4) of the center of gravity (G) virtual plane perpendicular to the street and the face portion (1) the reference plane in (Y) (X) and parallel to the top edge of the face portion (1) (12) the face side edge of the recess (8) from (13 Until perpendicular to the distance (A) measured, the center line (14) is the virtual surface from the bottom surface (16) and intersects the point (P) of said sole portion (3) of the shaft insertion hole (6) and (Y) The ratio (B / A) to the distance (B) measured to the toe side end (15) of the head body (4) in parallel with the reference plane (X) is 3.5 to 5.5. And the height (D) from the reference surface (X) of the upper end (18) of the crown (2 ) in the virtual surface (Y) and the reference of the lowest surface (9) of the recess (8). The ratio (D / E) to the height (E) from the surface (X) is set to 10.0 to 70.0, and the face side edge (13) of the recess (8) in the virtual surface (Y ) and length is a perpendicular line is drawn to the outer surface of points 10mm moved back direction (Q) the recess (8) to (L) above 10mm from the recess ( It is characterized in that the formation of the flat region (19) at least in parallel to the junction with the inner surface (20) of said sole portion to a portion corresponding to the lowest surface (9) (3) of).

In the golf club head described above, the ratio of the height (C) from the reference surface (X) of the back side edge (17 ) of the recess (8 ) in the virtual plane (Y) to the height (D) ( D / C) is preferably set to 3.0 to 12.0. Further, it is preferable to vertically mutually parallel ribs of a single or a plurality of flat areas (19) (22) of the recess (8).

  According to the golf club head of the present invention, in the golf club head having a hollow structure in which the concave portion having a convex curved surface formed inward is formed in the crown portion, the distance ratio (B / A) defined as described above is 3.5. Since the height ratio (D / E) is set to 10.0 to 70.0 and the length of the perpendicular (L) is set to 10 mm or more, the recess is formed. The concave portion has a shape that is deeply depressed toward the bottom surface of the sole portion, so that the center of gravity position can be further lowered and the flight distance of the hit ball can be improved as compared with the golf club head proposed in Patent Document 1. Without changing the acoustic characteristics of the head body, the hitting sound can be made higher and lower in volume.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a golf club head according to an embodiment of the present invention.
This golf club head (hereinafter simply referred to as “head”) has a crown portion 2 connected to the upper edge side of the face portion 1 and a sole portion 3 connected to the lower edge side of the face portion 1. A hollow metal head main body 4 having the crown portion 2 and the sole portion 3 as outer shells is formed. A metal is used as the material of the head body 4, and a low specific gravity metal such as titanium or a titanium alloy, or iron or an iron alloy is particularly preferably used. The crown portion 2 is provided with a shaft insertion hole 6 at a position on the face portion 1 side and on the heel 5 side.
In such a head, a concave portion 8 having a convex curved surface toward the inside of the head main body 4 is formed in the central area of the crown portion 2. The periphery of the recess 8 is surrounded by high walls 7a, 7b, 7c, and the bottom surrounded by these has a flat shape substantially parallel to the inner surface of the sole portion 3, and the lowest surface 9 is formed at the center thereof. Is located. Further, the center of gravity G of the head main body 4 is positioned inside the recess 8.

  The shape of the recess 8 is specified by parameters as described below. That is, as shown in FIGS. 2 to 5, in a state where the head main body 4 is properly grounded with respect to the reference plane X, the face portion 1 of the face portion 1 in the virtual plane Y that passes through the center of gravity G of the head main body 4 and is orthogonal to the face surface 11. From the distance A measured from the top edge 12 to the face side edge portion 13 of the recess 8 and the point P where the center line 14 of the shaft insertion hole 6 intersects the bottom surface 16 of the sole portion, to the toe side end portion 15 of the head body 4 The ratio (B / A) to the distance B is in the range of 3.5 to 5.5.

  Further, in the virtual plane Y, the height D of the upper end 18 of the crown portion 2 (the upper end of the wall 7c on the face side) from the reference plane X and the height E of the lowest surface 9 of the recess 8 from the reference plane X The ratio (D / E) is in the range of 10.0 to 70.0.

Furthermore, the length L of a perpendicular line extending from the point Q moved 10 mm in the back direction from the face side edge 13 to the outer surface of the recess 8 in the virtual plane Y is 10 mm or more.
Here, the state of being properly grounded means that the head body 4 is placed on the reference plane X so as to form a predetermined lie angle and loft angle with respect to the reference plane X. For example, the score line of the face surface 11 has a lie angle that is parallel to the reference surface X, and a loft angle that causes the face angle to be ± 0 °.

  By setting each parameter as described above, the recess 8 has a very deep shape, and the center of gravity G of the head body 4 is significantly lowered to a position close to the bottom surface of the recess 8. Further, by forming the concave portion 8 having a large depth, a bent wall portion 7a is formed, and the face-side wall portion 7c is joined to the sole portion 3 at an abrupt angle from the face-side edge portion 13, so that the face The rigidity of the head body 4 is increased by reducing the hollow volume of the side wall portion 7c. Further, since the hollow volume of the hollow structure is reduced, the amplitude of the surface of each part of the head body 4 is reduced, and the hitting sound is reduced in volume. Further, the standing wave generated in the head main body 4 at the time of hitting is emphasized, and the effect that the reverberation of the hitting sound becomes longer also occurs.

  If the distance ratio (B / A) is less than 3.5, the length of the head body 4 in the toe-heel direction is shortened so that the appearance is reduced and the player feels that it is difficult to hit. The falling swing trajectory also changes, making it difficult to improve the flight distance of the hit ball. If the distance ratio (B / A) exceeds 5.5, the length in the toe-heel direction becomes longer and the distance A becomes smaller, so the player feels as if using an iron club. Changes and it becomes difficult to improve the flight distance of the hit ball.

  Further, when the height ratio (D / E) is less than 10, the recess 8 is reduced, and the low center of gravity effect of the head body 4 is reduced. The angle becomes too steep and the durability of the head body 4 is lowered.

  Therefore, in addition to further improving the flying distance of the hit ball by further lowering the center of gravity, the hitting sound is increased by increasing the rigidity of the head body 4 and the hollow volume is reduced, and the volume of the hitting sound is reduced. The reverberation can be lengthened.

  In the head described above, the ratio (D / C) of the height C from the reference plane X of the back side edge 17 of the recess 8 in the imaginary plane Y to the height D is set to 3.0 to 12. A range of 0 is desirable.

  By doing so, the cross-sectional shape of the recess 8 becomes a bowl shape, and the mass of the head main body 4 is greatly dispersed on the face back side and the side side. The directionality can be improved.

Then, as shown in FIG. 5, the flat region 19 including at least a minimum surface 9 of the sole portion 3 of the inner surface and the concave portion 8 which is substantially parallel flat, formed to be parallel to the junction with the inner surface 20 of the sole portion 3 It is . By joining the flat region 19 to the inner surface of the sole portion 3 in this way, the volume of the hollow portion 21 on the face side is reduced to reduce the resonance of the hitting sound and the rigidity of the flat region 19 is increased. Since the resonance frequency of the main body 4 is increased, the hitting sound can be increased and the volume can be decreased.

  In order to further increase the hitting sound and lower the volume, as shown in FIG. 6, one or a plurality of parallel ribs 22 may be erected on the surface of the flat region 19. Since the rigidity of the head main body 4 can be increased by the standing of the ribs 22, it is possible to further increase the pitch and the volume of the hitting sound. The size and direction of the rib 22 are not particularly limited, but in order to reduce air resistance during swing, the rib 22 is parallel to the swing direction from the face side wall 7c to the back side wall 7b. It is good to provide in.

FIG. 7 is a cross-sectional view of the imaginary plane Y of the head according to the reference example of the invention.
This head has a hollow structure in which a gap is provided between a portion corresponding to at least the lowest surface 9 of the recess 9 and the inner surface 20 of the sole portion 3. Even if such a gap is provided, the hitting sound can be increased and the volume can be decreased by configuring the shape of the recess 8 with the parameters described above.

In this reference example , as shown in FIG. 8, a through-hole 23 is provided in at least the lowest surface 9 of the recess 8 serving as the vibration center of the head body 4, and the through-hole 23 has a specific gravity of 3.0 or less. It is desirable to block with the material 24. When the specific gravity of the vibration absorbing material 24 is more than 3.0, vibrations transmitted through the head body 4 at the time of impact cannot be sufficiently absorbed, and it is disadvantageous for lowering the center of gravity. Examples of the vibration absorbing material 24 include fiber reinforced plastics such as CFRP which is a carbon-based composite material.

  By doing so, the impact sound 24 can absorb the hitting sound propagating through the outer shell and the inside of the head main body 4 at the time of hitting, so that the volume of the hitting sound can be lowered.

  The through hole 23 is preferably a circle having a diameter of 20 mm or more in order to obtain a sufficient sound reduction effect.

  The head body 4 is made of a titanium alloy, and its basic structure is shown in FIG. 1, and the distance ratio (B / A), height ratio (D / E), and perpendicular length L are varied as shown in Table 1. The heads of the present invention (Examples 1 to 5) and comparative heads (Comparative Examples 1 to 5) were manufactured, and shafts were connected to the respective heads to form golf clubs having a length of 45 inches.

  Using these 10 types of golf clubs, a ball having a hardness value of 2.5 to 3.8 mm was hit in the vicinity of the sweet spot on the face surface by a swing of a head speed of 40 m / sec by a test hitting robot, Height and size were measured. The hardness value of the ball is the difference in deformation when a load of 130 kg and 10 kg is applied.

  In addition, using these golf clubs, a 30-tester swings at a head speed of 40 m / second near the sweet spot on the face surface, and the launch angle of the ball immediately after launch, the spin amount, the hit distance of the hit ball, Durability was measured.

  The evaluation by the latter tester was indicated by an index with the measured value of the comparison head 1 as 100. It shows that it is excellent in each measurement item, so that an index value is large. The spin rate is evaluated by the reciprocal of the measured value.

  For durability, the ball ejected from the air cannon tester repeatedly collided near the sweet spot on the face surface at a speed of 50 m / second, and the air cannon tester was stopped every 200 times, causing cracks on the face surface. It was confirmed visually.

From the experimental results shown in Table 1, it can be seen that all the heads of the present invention have a high hitting sound and a low sound volume. Moreover, has improved high hitting out keratinocytes and low spin in comparison with the comparative head, it can be seen that excellent flight distance.

1 is a perspective view of a golf club head according to an embodiment of the present invention. FIG. 2 is a front view from the face side of the golf club head of FIG. 1. FIG. 2 is a top view of the golf club head of FIG. 1. It is a side view from the toe side of the golf club head of FIG. It is sectional drawing from the toe side in the virtual surface Y shown in FIG. 3 is another example of the golf club head of FIG. 1. It is sectional drawing from the toe side in the virtual surface Y of the golf club head which consists of a reference example of this invention. 8 is another example of the golf club head of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Face part 2 Crown part 3 Sole part 4 Head main body 5 Heel 6 Shaft insertion hole 7 Wall part 8 Recess 9 Recessed lowest surface 10 Toe 11 Face surface 12 Top edge 13 Face side edge 14 Center line 15 End on the toe side Part 16 Bottom surface of sole part 17 Back side edge part 18 Upper end of face side wall part 19 Flat region 20 Inner surface of sole part 21 Face side hollow part 22 Rib 23 Through hole 24 Damping material

Claims (3)

The heel (5 ) of the crown portion (2) is connected to the hollow head body (4) having the crown portion (2) connected to the upper edge side of the face portion (1) and the sole portion (3) connected to the lower edge side. In the golf club head in which the shaft insertion hole (6) is provided on the side ) and the concave portion (8) having a convex curved surface inward is formed in the central region.
In a state where the head body (4) is properly grounded with respect to the reference surface (X), the lowest surface (9) of the recess (8) is formed so as to be located in the central region of the crown portion (2). ,
Said head body (4) of the center of gravity (G) virtual plane perpendicular to the street and the face portion (1) the reference plane in (Y) (X) and parallel to the top edge of the face portion (1) (12) The distance (A) measured from the face side edge (13) of the recess (8) to the center line (14) of the shaft insertion hole (6 ) is the bottom surface (16) of the sole (3). The distance (B) measured from the intersecting point (P) to the end (15) on the toe side of the head body (4) perpendicular to the virtual plane (Y) and parallel to the reference plane (X) While the ratio (B / A) is set to 3.5 to 5.5,
The height (D) from the reference surface (X) of the upper end (18) of the crown portion (2 ) in the virtual surface (Y), and the reference surface (X ) of the lowest surface (9) of the recess (8 ) The ratio (D / E) to the height (E) from is set to 10.0 to 70.0,
In addition, a length (L ) where a perpendicular is dropped from the point (Q) moved from the face side edge (13) of the concave portion (8) by 10 mm in the back direction to the outer surface of the concave portion (8) on the virtual surface (Y) (L) ) 10 mm or more ,
A golf club head in which a flat region (19) joined in parallel to the inner surface (20) of the sole portion (3) is formed in at least a portion of the recess (8) corresponding to the lowest surface (9) . The ratio (D / C) of the height (C) from the reference surface (X ) of the back side edge (17) of the recess (8) to the virtual surface (Y) and the height (D). The golf club head according to claim 1, wherein the ratio is 3.0 to 12.0. The golf club head according to claim 1 or 2, wherein one or a plurality of parallel ribs (22) are erected in the flat region (19) of the recess (8) .

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